Moisture-absorbing polymer particle, method for forming the same and application thereof

Abstract

The present invention discloses a moisture-absorbing polymer particle, which either comprises PNIPAm crosslinking copolymer or a structure having PNIPAm crosslinking copolymer as a core and polymer with sulfonic acid group as a shell. The present invention also discloses a method for producing the provided moisture-absorbing polymer particle and an application thereof; the application is referred to as a continuous dehumidifying system which comprises a first module to perform a dehumidifying process and a second module to perform a regeneration process, wherein the dehumidifying process is performed at a temperature lower than 33° C. and the regeneration process is performed at a temperature higher than 40° C.

1 . A moisture-absorbing polymer particle which comprises poly-N-isopropylacrylamide (PNIPAm] crosslinking copolymer.  
   
   
       2 . The moisture-absorbing polymer particle in  claim 1 , wherein said crosslinking copolymer is polymerized by N-isopropylacrylamide (NIPAm), as a monomer, with an acrylamide-type crosslinker having at least two double bonds.  
   
   
       3 . The moisture-absorbing polymer particle in  claim 2 , wherein said acrylamide-type crosslinker is selected as anyone or any combination of the following: N,N′-diallyltartardiamide, N′-methylene-bisacrylamide(MBAAm), N,N′-hexamethylenebisacrylamide, N,N′-methylenebishydroxymethylacrylamide, and glyoxalbisacrylamide.  
   
   
       4 . The moisture-absorbing polymer particle in  claim 2 , wherein the amount of said acrylamide-type crosslinker added is selected 0.5 wt %-6 wt % of NIPAm.  
   
   
       5 . The moisture-absorbing polymer particle in  claim 2 , wherein the preferred amount of said acrylamide-type crosslinker added is 2 wt % of NIPAm.  
   
   
       6 . A moisture-absorbing polymer particle with a structure of: 
 a core comprising PNIPAm crosslinking copolymer; and    a shell comprising polymer with sulfonic acid group.    
   
   
       7 . The moisture-absorbing polymer particle in  claim 6 , wherein said PNIPAm crosslinking copolymer is polymerzed by NIPAm with an acrylamide-type crosslinker having at least two double bonds.  
   
   
       8 . The moisture-absorbing polymer particle in  claim 7 , wherein said acrylamide-type crosslinker is selected as anyone or any combination of the following: N,N′-diallyltartardiamide, N′-methylene-bisacrylamide(MBAAm), N,N′-hexamethylenebisacrylamide, N,N′-methylenebishydroxymethylacrylamide, and glyoxalbisacrylamide.  
   
   
       9 . The moisture-absorbing polymer particle in  claim 7 , wherein the amount of said acrylamide-type crosslinker added is selected 0.5 wt %-6 wt % of NIPAm.  
   
   
       10 . The moisture-absorbing polymer particle in  claim 7 , wherein the preferred amount of said acrylamide-type crosslinker added is 2 wt % of NIPAm.  
   
   
       11 . The moisture-absorbing polymer particle in  claim 6 , wherein the polymer of said shell further comprises [poly(styrene sulfonic acid), PSSA].  
   
   
       12 . A method for forming a moisture-absorbing polymer particle, comprising: 
 mixing NIPAm, as a monomer, a acrylamide-type crosslinker having at least two double bonds, and water to form a first solution;    dissolving a water-soluble initiator into water to form a second solution;    mixing said first solution with said second solution at a specific temperature to form a third solution;    performing a dispersion process at said specific temperature to distribute a plurality of liquid drops containing said third solution in an organic solvent; and    adding a catalyst into said organic solvent at said specific temperature for starting and accelerating a polymerization in said plurality of liquid drops, wherein NIPAm, as a monomer, and said acrylamide-type crosslinker are polymerized into a first moisture-absorbing polymer particle.    
   
   
       13 . The method in  claim 12 , wherein said acrylamide-type crosslinker is selected as anyone or any combination of the following: N,N′-diallyltartardiamide, N′-methylene-bisacrylamide(MBAAm), N,N′-hexamethylenebisacrylamide, N,N′-methylenebishydroxymethylacrylamide, and glyoxalbisacrylamide.  
   
   
       14 . The method in  claim 12 , wherein the amount of said acrylamide-type crosslinker added is selected 0.5 wt %-6 wt % of NIPAm.  
   
   
       15 . The method in  claim 12 , wherein the preferred amount of said acrylamide-type crosslinker added is 2 wt % of NIPAm.  
   
   
       16 . The method in  claim 12 , wherein said water-soluble initiator comprises ammounium persulfate(APS).  
   
   
       17 . The method in  claim 12 , wherein the amount of said water-soluble initiator is selected 0.5 wt %-2 wt % of NIPAm.  
   
   
       18 . The method in  claim 12 , wherein said specific temperature is lower than 33° C.  
   
   
       19 . The method in  claim 12 , wherein said organic solvent comprises toluene.  
   
   
       20 . The method in  claim 12 , wherein said catalyst comprises N,N,N′,N′,-Tetramethylethylendiamine (TEMED).  
   
   
       21 . The method in  claim 12 , wherein said polymerization time is longer than 4 hours.  
   
   
       22 . The method in  claim 12 , wherein said first moisture-absorbing particle is formed under a condition with inert gas purged.  
   
   
       23 . The method in  claim 12 , further comprising: 
 performing at least one purification process to remove unreacted NIPAm, unreacted acrylamide-type crosslinker and impurities; and    performing a shell-forming process to form a shell region having sulfonic acid group onto the surface of the previous purifed first moisture-absorbing polymer particle, and through which to form a second moisture-absorbing polymer particle.    
   
   
       24 . The method in  claim 23 , wherein at least one said purification process further comprises: 
 removing unreacted NIPAm, unreacted acrylamide-type crosslinker and impurities by an extracting agent; and    removing said extracting agent by a cleaning agent.    
   
   
       25 . The method in  claim 24 , wherein said extracting agent comprises ketone.  
   
   
       26 . The method in  claim 24 , wherein said cleaning agent comprises water.  
   
   
       27 . The method in  claim 23 , wherein said shell-forming process further comprises: 
 coating a [poly(styrene sulfonic acid), PSSA] solution onto the surface of the previous purifed first moisture-absorbing polymer particle; and    performing a drying procedure to form a shell region having PSSA on the previous purifed first moisture-absorbing polymer particle.    
   
   
       28 . The method in  claim 27 , wherein said PSSA solution comprises 30 wt % PSSA.  
   
   
       29 . a continuous dehumidifying system, comprising: 
 a first module to perform a dehumidifying process, said first module comprises a plurality of moisture-absorbing polymer particles to process a humid gas stream inlet and generate a dryed exhaust stream outlet; and    a second module to perform a regeneration process, said second module processes used said plurality of moisture-absorbing polymer particles in said first module; regenerate them and prepare for next dehumidifying process going to perform, said plurality of moisture-absorbing polymer particles further comprises poly-N-isopropylacrylamide (PNIPAm] crosslinking copolymer.    
   
   
       30 . The continuous dehumidifying system in  claim 29 , wherein said dehumidifying process is performed at a temperature lower than 33° C.  
   
   
       31 . The continuous dehumidifying system in  claim 29 , wherein said regeneration process is performed at a temperature higher than 40° C.  
   
   
       32 . The continuous dehumidifying system in  claim 29 , wherein said first module further comprises: 
 a first absorbing device and a second absorbing device, said first absorbing device and said second absorbing device both contain said plurality of moisture-absorbing polymer particles and process said humid gas stream inlet and generate said exhaust gas stream in turn;    a first control device to lead said humid gas stream inlet into said first absorbing device, detect the temperature of the humid gas stream inlet at a first inlet of the first absorbing device and generate a first signal of temperature, and detect the dew point of said humid gas stream inlet at said first inlet of said first absorbing device and generate a first signal of dew point;    a second control device to lead said exhaust gas stream generated in said first absorbing device out of said first absorbing device, detect the temperature of said exhaust gas stream at a first outlet of said first absorbing device and generate a second signal of temperature, and detect the dew point of said exhaust gas stream at said first outlet of said first absorbing device and generate a second signal of dew point;    a third control device to lead said humid gas stream inlet into said second absorbing device, detect the temperature of said humid gas stream inlet at a first inlet of said second absorbing device and generate a third signal of temperature, and detect the dew point of said humid gas stream inlet at said first inlet of said second absorbing device and generate a third signal of dew point;    a fourth control device to lead said exhaust gas stream generated in said first absorbing device out of said second absorbing device, detect the temperature of said exhaust gas stream at a first inlet of said second absorbing device and generate a fourth signal of temperature, and detect the dew point of said exhaust gas stream at said first outlet of said second absorbing device and generate a fourth signal of dew point;    a first driving device to provide driving force for leading the humid gas stream inlet into said first absorbing device or said second absorbing device, and for leading said exhaust gas stream out of said first absorbing device or said second absorbing device, further, said first driving device can adjust the gas flow rate and according to which generate a first signal of flow rate; and    a first central processing device to receive said first signal of temperature, said second signal of temperature, said first signal of dew point, said second signal of dew point, and said first signal of flow rate to determine a first feed humidity describing said humid gas stream inlet at said first inlet of the first absorbing device and a first exhaust humidity describing said exhaust gas stream at said first outlet of said first absorbing device, on the other hand, said first central processing device receives said third signal of temperature, said fourth signal of temperature, said third signal of dew point and said fourth signal of dew point, and combine with said first signal of flow rate, to determine a second feed humidity describing said humid gas stream inlet at said first inlet of said second absorbing device and a second exhaust humidity describing said exhaust gas stream at said first outlet of said second absorbing device.    
   
   
       33 . The continuous dehumidifying system in  claim 32 , wherein when the ratio of said first exhaust humidity to said first feed humidity reaches a certain set point, said first central processing device generates a switching signal to disable said first control device and said second control device, and enable said third control device and said fourth control device, through which to enable said dehumidifying process performed by said second absorbing device and disable said dehumidifying process performed by said first absorbing device.  
   
   
       34 . The continuous dehumidifying system in  claim 32 , wherein when the ratio of said second exhaust humidity to said second feed humidity reaches a certain set point, said first central processing device generates a switching signal to disable said third control device and said fourth control device, and enable said first control device and said second control device, through which to enable said dehumidifying process performed by said first absorbing device and disable said dehumidifying process performed by said second absorbing device.  
   
   
       35 . The continuous dehumidifying system in  claim 29 , wherein said second module further comprises: 
 a second central processing device to detect the temperature of a regeneration feed gas and generate an instant control signal;    a heating device to receive said control signal and adjust the temperature of said regeneration feed gas to a regeneration temperature, said regeneration feed gas absorbs the moisture contained in used said plurality of moisture-absorbing polymer particles in said first absorbing device or said second absorbing device and forms a regeneration exhaust gas, whereupon said first module can proceed next dehumidifying process utilizing regenerated said moisture-absorbing polymer particles;    a fifth control device to lead said regeneration feed gas into said first absorbing device, detect the temperature of said regeneration feed gas at a second inlet of said first absorbing device and generate a fifth signal of temperature, and detect the dew point of said regeneration feed gas at said second inlet of said first absorbing device and generate a fifth signal of dew point;    a sixth control device to lead said regeneration exhaust gas generated in said first absorbing device out of said first absorbing device, detect the temperature of said regeneration exhaust gas at a second outlet of said first absorbing device and generate a sixth signal of temperature, and detect the dew point of said regeneration exhaust gas at said second outlet of said first absorbing device and generate a sixth signal of dew point;    a seventh control device to lead said regeneration feed gas into said second absorbing device, detect the temperature of said regeneration feed gas at a second inlet of said second absorbing device and generate a seventh signal of temperature, and detect the dew point of said regeneration feed gas at said second inlet of said second absorbing device and generate a seventh signal of dew point;    an eighth control device to lead said regeneration exhaust gas generated in said second absorbing device out of said second absorbing device, detect the temperature of said regeneration exhaust gas at said second outlet of said second absorbing device and generate an eighth signal of temperature, and detect the dew point of said regeneration exhaust gas at said second outlet of said second absorbing device and generate an eighth signal of dew point;    a second driving device to provide driving force for leading said regeneration feed gas into said first absorbing device or said second absorbing device, and for leading said regeneration exhaust gas out of said first absorbing device or said second absorbing device, further, said second driving device can adjust the gas flow rate and according to which generate a second signal of flow rate; and    a third central processing device to receive said fifth signal of temperature, said sixth signal of temperature, said fifth signal of dew point, said sixth signal of dew point, and said second signal of flow rate to determine a third feed humidity describing said regeneration feed gas at said second inlet of said first absorbing device and a third exhaust humidity describing said regeneration exhaust gas at said second outlet of said first absorbing device, on the other hand, said third central processing device receives said seventh signal of temperature, said eighth signal of temperature, said seventh signal of dew point and said eighth signal of dew point, and combine with said second signal of flow rate, to determine a fourth feed humidity describing said regeneration feed gas at said second inlet of said second absorbing device and a fourth exhaust humidity describing said regeneration exhaust gas at said second outlet of said second absorbing device.    
   
   
       36 . The continuous dehumidifying system in  claim 35 , wherein when said third exhaust humidity equals said third feed humidity, said third central processing device generates a switching signal to disable said fifth control device and said sixth control device, and enable said seventh control device and said eighth control device, through which to enable said regeneration process performed by said second absorbing device and disable said regeneration process performed by said first absorbing device.  
   
   
       37 . The continuous dehumidifying system in  claim 35 , wherein when said fourth exhaust humidity equals said fourth feed humidity, said third central processing device generates a switching signal to disable said seventh control device and said eighth control device, and enable said fifth control device and said sixth control device, through which to enable said regeneration process performed by said first absorbing device and disable said regeneration process performed by said second absorbing device.  
   
   
       38 . The continuous dehumidifying system in  claim 29 , wherein said PNIPAm crosslinking copolymer is polymerzed by NIPAm and a acrylamide-type crosslinker having at least two double bonds.  
   
   
       39 . The continuous dehumidifying system in  claim 38 , wherein said acrylamide-type crosslinker is selected as anyone or any combination of the following: N,N′-diallyltartardiamide, N′-methylene-bisacrylamide(MBAAm), N,N′-hexamethylenebisacrylamide, N,N′-methylenebishydroxymethylacrylamide, and glyoxalbisacrylamide.  
   
   
       40 . The continuous dehumidifying system in  claim 38 , wherein the amount of said acrylamide-type crosslinker added is selected 0.5 wt %-6 wt % of NIPAm.  
   
   
       41 . The continuous dehumidifying system in  claim 38 , wherein the preferred amount of said acrylamide-type crosslinker added is 2 wt % of NIPAm.  
   
   
       42 . The continuous dehumidifying system in  claim 29 , wherein said moisture-absorbing polymer particle has a shell region having sulfonic acid group.  
   
   
       43 . The continuous dehumidifying system in  claim 42 , wherein the material of said shell is [poly(styrene sulfonic acid), PSSA).  
   
   
       44 . A continuous dehumidifying system, comprising: 
 a first module to perform a dehumidifying process, said first module comprises a plurality of moisture-absorbing polymer particles to process a humid gas stream inlet and generate a dryed exhaust stream outlet; and    a second module to perform a regeneration process, said second module processes used said plurality of moisture-absorbing polymer particles in said first module ; regenerate them and prepare for next dehumidifying process going to perform, said plurality of moisture-absorbing polymer particles further comprises poly-N-isopropylacrylamide (PNIPAml crosslinking copolymer.    
   
   
       45 . The continuous dehumidifying system in  claim 44 , wherein said dehumidifying process is performed at a temperature lower than 33° C.  
   
   
       46 . The continuous dehumidifying system in  claim 44 , wherein said regeneration process is performed at a temperature higher than 40° C.  
   
   
       47 . The continuous dehumidifying system in  claim 44 , wherein said first module further comprises: 
 a first absorbing device and a second absorbing device, said first absorbing device and said second absorbing device both contain said plurality of moisture-absorbing polymer particles and process said humid gas stream inlet and generate said exhaust gas stream in turn;    said plurality of moisture-absorbing polymer particles in said first absorbing device and the second absorbing device, were used to absorb the moisture contained in said humid gas stream inlet;    two supporting devices which are located in the bottom of said first absorbing device and said second absorbing device, respectively, each of said two supporting devices is used for bearing a stack of said plurality of moisture-absorbing polymer particles of a certain height, and each of said two supporting devices has a plurality of holes for ventilation;    a first feed control valve to lead said humid gas stream inlet into said first absorbing device;    a first exhaust control valve to lead said exhaust gas stream generated in said first absorbing device out of said first absorbing device;    a second feed control valve to lead said humid gas stream inlet into said second absorbing device;    a second exhaust control valve to lead said exhaust gas stream generated in said second absorbing device out of said second absorbing device;    a first temperature detector to detect the temperature of said humid gas stream inlet at a first inlet of said first absorbing device and generate a first signal of temperature;    a second temperature detector to detect the gas temperature at half said certain height of said plurality of moisture-absorbing polymer particle stack in said first absorbing device and generate a first signal of temperature;    a third temperature detector to detect the temperature of said exhaust gas stream at a first outlet of said first absorbing device and generate a third signal of temperature;    a fourth temperature detector to detect the temperature of said humid gas stream inlet at a first inlet of said second absorbing device and generate a fourth signal of temperature;    a fifth temperature detector to detect the gas temperature at half said certain height of said plurality of moisture-absorbing polymer particle stack in said second absorbing device and generate a fifth signal of temperature;    a sixth temperature detector to detect the temperature of said exhaust gas stream at a first outlet of said second absorbing device and generate a sixth signal of temperature;    a first dew point meter to detect the dew point of said humid gas stream inlet at said first inlet of said first absorbing device and generate a first signal of dew point;    a second dew point meter to detect the dew point of said exhaust gas stream at said first outlet of said first absorbing device and generate a second signal of dew point;    a third dew point meter to detect the dew point of said humid gas stream inlet at said first inlet of said second absorbing device and generate a third signal of dew point;    a fourth dew point meter to detect the dew point of said exhaust gas stream at said first outlet of said second absorbing device and generate a fourth signal of dew point;    a first driving device to provide driving for leading said humid gas stream inlet into said first absorbing device or said second absorbing device, and for leading said exhaust gas stream out of said first absorbing device or said second absorbing device, further, said first driving device can adjust the gas flow rate and according to which generate a first signal of flow rate; and    a first central processing device to receive said first signal of temperature, said second signal of temperature, said third signal of temperature, said first signal of dew point, said second signal of dew point, and said first signal of flow rate to determine a first feed humidity describing said humid gas stream inlet at said first inlet of said first absorbing device and a first exhaust humidity describing said exhaust gas stream at said first outlet of said first absorbing device, on the other hand, said first central processing device receives said fourth signal of temperature, said fifth signal of temperature, said sixth signal of temperature, said third signal of dew point and said fourth signal of dew point, and combine with said first signal of flow rate, to determine a second feed humidity describing said humid gas stream inlet at said first inlet of said second absorbing device and a second exhaust humidity describing said exhaust gas stream at said first outlet of said second absorbing device.    
   
   
       48 . The continuous dehumidifying system in  claim 47 , wherein a plurality of spheres are further stacked both on top of and under said plurality of moisture-absorbing polymer particles, in order to allow an uniform contact between the gas and the polymer particles.  
   
   
       49 . The continuous dehumidifying system in  claim 47 , wherein said first module has a defogger to remove liquid micro-drops carried by said humid gas stream inlet.  
   
   
       50 . The continuous dehumidifying system in  claim 47 , wherein said first driving device has an air pump for providing driving force for the gas flow, and a flow rate controller for controlling the gas flow rate.  
   
   
       51 . The continuous dehumidifying system in  claim 47 , wherein when the ratio of said first exhaust humidity to said first feed humidity reaches a certain set point, said first central processing device generates a switching signal to disable said first feed control valve and said first exhaust control valve, and enable said second feed control valve and said second exhaust control valve, through which to enable said dehumidifying process performed by said second absorbing device and disable said dehumidifying process performed by said first absorbing device.  
   
   
       52 . The continuous dehumidifying system in  claim 47 , wherein when the ratio of said second exhaust humidity to said second feed humidity reaches a certain set point, said first central processing device generates a switching signal to disable said second feed control valve and said second exhaust control valve, and enable said first feed control valve and said first exhaust control valve, through which to enable said dehumidifying process performed by said first absorbing device and disable said dehumidifying process performed by said second absorbing device.  
   
   
       53 . The continuous dehumidifying system in  claim 44 , wherein said second module further comprises: 
 a second central processing device to detect the temperature of a regeneration feed gas and generate an instant control signal;    a heating device to receive said control signal and adjust the temperature of said regeneration feed gas to a regeneration temperature, said regeneration feed gas absorbs the moisture contained in used said moisture-absorbing polymer particles in said first absorbing device or said second absorbing device and forms a regeneration exhaust gas, whereupon said first module can proceed next dehumidifying process utilizing regenerated said moisture-absorbing polymer particles;    a third feed control valve to lead said regeneration feed gas into said first absorbing device;    a third exhaust control valve to lead a regeneration exhaust gas generated in said first absorbing device out of said first absorbing device;    a fourth feed control valve to lead said regeneration feed gas into said second absorbing device;    a fourth exhaust control valve to lead a regeneration exhaust gas generated in said second absorbing device out of said second absorbing device;    a seventh temperature detector to detect the temperature of said regeneration feed gas at a second inlet of said first absorbing device and generate a seventh signal of temperature;    an eighth temperature detector to detect the temperature of said regeneration exhaust gas at a second outlet of said first absorbing device and generate an eighth signal of temperature;    a ninth temperature detector to detect the temperature of said regeneration feed gas at a second inlet of said second absorbing device and generate a ninth signal of temperature;    a tenth temperature detector to detect the temperature of said regeneration exhaust gas at a second outlet of said second absorbing device and generate a tenth signal of temperature.    a fifth dew point meter to detect the dew point of said regeneration feed gas at said second inlet of said first absorbing device and generate a fifth signal of dew point;    a sixth dew point meter to detect the dew point of said regeneration exhaust gas at said second outlet of said first absorbing device and generate a sixth signal of dew point;    a seventh dew point meter to detect the dew point of said regeneration feed gas at said second inlet of said second absorbing device and generate a seventh signal of dew point;    an eighth dew point meter to detect the dew point of said regeneration exhaust gas at said second outlet of said second absorbing device and generate an eighth signal of dew point;    a second driving device to provide driving for leading said regeneration feed gas into said first absorbing device or said second absorbing device, and for leading said regeneration exhaust gas out of said first absorbing device or said second absorbing device, further, said second driving device can adjust the gas flow rate and according to which generate a second signal of flow rate; and    a third central processing device to receive said seventh signal of temperature, said eighth signal of temperature, said fifth signal of dew point, said sixth signal of dew point, and said second signal of flow rate to determine a third feed humidity describing said regeneration feed gas at said second inlet of said first absorbing device and a third exhaust humidity describing said regeneration exhaust gas at said second outlet of said first absorbing device, on the other hand, said third central processing device receives said ninth signal of temperature, said tenth signal of temperature, said seventh signal of dew point and said eighth signal of dew point, and combine with said second signal of flow rate, to determine a fourth feed humidity describing said regeneration feed gas at said second inlet of said second absorbing device and a fourth exhaust humidity describing said regeneration exhaust gas at said second outlet of said second absorbing device.    
   
   
       54 . The continuous dehumidifying system in  claim 53 , wherein when said third exhaust humidity equals said third feed humidity, said third central processing device generates a switching signal to disable said third feed control valve and said third exhaust control valve, and enable said fourth feed control valve and said fourth exhaust control valve, through which to enable said regeneration process performed by said second absorbing device and disable said regeneration process performed by said first absorbing device.  
   
   
       55 . The continuous dehumidifying system in  claim 53 , wherein when said fourth exhaust humidity equals said fourth feed humidity, said third central processing device generates a switching signal to disable said fourth feed control valve and said fourth exhaust control valve, and enable said third feed control valve and said third exhaust control valve, through which to enable said regeneration process performed by said first absorbing device and disable said regeneration process performed by said second absorbing device.  
   
   
       56 . The continuous dehumidifying system in  claim 44 , wherein said PNIPAm crosslinking copolymer is polymerzed by NIPAm and a acrylamide-type crosslinker having at least two double bonds.  
   
   
       57 . The continuous dehumidifying system in  claim 56 , wherein said acrylamide-type crosslinker is selected as anyone or any combination of the following: N,N′-diallyltartardiamide, N′-methylene-bisacrylamide(MBAAm), N,N′-hexamethylenebisacrylamide, N,N′-methylenebishydroxymethylacrylamide, and glyoxalbisacrylamide.  
   
   
       58 . The continuous dehumidifying system in  claim 56 , wherein the amount of said acrylamide-type crosslinker added is selected 0.5 wt %-6 wt % of NIPAm.  
   
   
       59 . The continuous dehumidifying system in  claim 56 , wherein the preferred amount of said acrylamide-type crosslinker added is 2 wt % of NIPAm.  
   
   
       60 . The continuous dehumidifying system in  claim 44 , wherein said moisture-absorbing polymer particle has a shell region having sulfonic acid group.  
   
   
       61 . The continuous dehumidifying system in  claim 60 , wherein the material of said shell is [poly(styrene sulfonic acid), PSSA].