US2005263436A1PendingUtilityA1

Coal tar and hydrocarbon mixture pitch production using a high efficiency evaporative distillation process

52
Individually held — no corporate assignee on recordPriority: May 11, 2001Filed: May 10, 2005Published: Dec 1, 2005
Est. expiryMay 11, 2021(expired)· nominal 20-yr term from priority
Inventors:William E. SaverE. Ronald Mchenry
C08J 2395/00C04B 2235/614C08J 3/201C04B 2235/6021B29C 2948/92704C10L 1/322C10C 3/06C04B 35/532C04B 2235/96C04B 35/522C04B 2235/77C04B 35/83C08L 2555/54C08L 95/00B29C 48/92C10C 1/16C10C 3/002F16D 69/023B29C 48/03B29C 48/022
52
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

Described are methods that utilize high efficiency evaporative distillation to make a high softening point coal tar pitch, a quinoline insoluble-free and ash-free coal tar pitch having a desired softening point, and a mesophase coal tar pitch. Each of the methods uses a feed coal tar pitch having a softening point in the range of 70° C. to 160° C. The methods may be carried out using appropriate conventional distillation equipment, a wiped film evaporator, or a thin film evaporator.

Claims

exact text as granted — not AI-modified
1 . A method of making a high softening point coal tar pitch using high efficiency evaporative distillation, comprising the steps of: 
 feeding a feed coal tar pitch having a softening point in the range of 70° C. to 160° C. into a processing vessel wherein said processing vessel is heated to a temperature in the range of 300° C. to 600° C. and wherein a pressure inside said processing vessel is 5 Torr or less; and    withdrawing an output coal tar pitch from said processing vessel, said output coal tar pitch having a softening point in the range of 140° C. to 180° C. and having less than 5% mesophase content.    
   
   
       2 . (canceled)  
   
   
       3 . A method according to  claim 1 , said output coal tar pitch having less than 1% mesophase content.  
   
   
       4 . A method according to  claim 1 , said feed coal tax pitch having a softening point in the range of 110° C. to 140° C.  
   
   
       5 . A method according to  claim 1 , wherein said processing vessel is heated to a temperature in the range of 350° C. to 500° C.  
   
   
       6 . (canceled)  
   
   
       7 . A method according to  claim 1 , said feeding step comprising introducing said feed coal tar pitch into a wiped film evaporator, said wiped film evaporator comprising said processing vessel.  
   
   
       8 . A method according to  claim 7 , wherein a feed rate of said feed coal tar pitch into said wiped film evaporator is in the range of 10 to 100 pounds/square foot of surface area/hour.  
   
   
       9 . A method according to  claim 7 , wherein a feed rate of said feed coal tar pitch into said wiped film evaporator is in the range of 35 to 50 pounds/square foot of surface area/hour.  
   
   
       10 . A method according to  claim 8 , wherein a residence time of said feed coal tar pitch in said processing vessel is in the range of 1 to 60 seconds.  
   
   
       11 . A method according to  claim 9 , wherein a residence time of said feed coal tar pitch in said processing vessel is in the range of 5 to 30 seconds.  
   
   
       12 . A method according to  claim 7 , wherein said wiped film evaporator forms a film of said feed coal tar pitch on an interior wall of said processing vessel, said film having a minimum thickness of 1 millimeter.  
   
   
       13 . A method according to  claim 1 , said feeding step comprising introducing said feed coal tar pitch into a thin film evaporator, said thin film evaporator comprising said processing vessel.  
   
   
       14 . A method according to  claim 13 , wherein a feed rate of said feed coal tar pitch into said thin film evaporator is in the range of 10 to 100 pounds/square foot of surface area/hour.  
   
   
       15 . A method according to  claim 13 , wherein a feed rate of said feed coal tar pitch into said thin film evaporator is in the range of 35 to 50 pounds/square foot of surface area/hour.  
   
   
       16 . A method according to  claim 14 , wherein a residence time of said feed coal tar pitch in said processing vessel is in the range of 1 to 60 seconds.  
   
   
       17 . A method according to  claim 15 , wherein a residence time of said feed coal tar pitch in said processing vessel is in the range of 5 to 30 seconds.  
   
   
       18 . A method according to  claim 13 , wherein said thin film evaporator forms a film of said feed coal tar pitch on an interior wall of said processing vessel, said feed coal tar pitch comprising a plurality of QI particles, said film having a minimum thickness that is no smaller than a thickness of a largest one of said QI particles.  
   
   
       19 . A method according to  claim 1 , said feeding step comprising introducing said feed coal tar pitch into a conventional distillation apparatus, said conventional distillation apparatus comprising said processing vessel.  
   
   
       20 . A method of making a pitch using high efficiency evaporative distillation, comprising the steps of: feeding a feed coal tar pitch having a softening point in the range of 70° C. to 160° C. into a processing vessel, wherein said processing vessel is heated to a temperature in the range of 300° C. to 600° C. and wherein a pressure inside said processing vessel is 5 Torr or less; withdrawing an output coal tar pitch from said processing vessel, said output coal tar pitch having a softening point in the range of 140° C. to 180° C. and having less than 5% mesophase content; and combining said output coal tar pitch with a plasticizer.  
   
   
       21 . A method according to  claim 20 , wherein said plasticizer comprises a coal tar having a viscosity in the range of 2 to 5 centistokes at 210° F. and a B(a)P equivalent of no more than 500 ppm B(a)P.  
   
   
       22 . A method according to  claim 21 , wherein said plasticizer comprises a mixture of said coal tar and a petroleum oil, said petroleum oil constituting 30% to 60% of said mixture.  
   
   
       23 . A method according to  claim 20 , said feeding step comprising introducing said coal tar pitch into a wiped film evaporator, said wiped film evaporator comprising said processing vessel.  
   
   
       24 . A method according to  claim 20 , said feeding step comprising introducing said coal tar pitch into a thin film evaporator, said thin film evaporator comprising said processing vessel.  
   
   
       25 . A method according to  claim 20 , said feeding step comprising introducing said feed coal tar pitch into a conventional distillation apparatus, said conventional distillation apparatus comprising said processing vessel, said output feed coal tar pitch having a softening point in the range of 140° C. to 180° C.  
   
   
       26 . (canceled)  
   
   
       27 . A method according to  claim 20 , said feed coal tar pitch having a softening point in the range of 110° C. to 140° C.  
   
   
       28 . A method according to  claim 20 , wherein said processing vessel is heated to a temperature in the range of 350° C. and 500° C.  
   
   
       29 - 48 . (canceled)  
   
   
       49 . A method of making a high softening point hydrocarbon mixture pitch using high efficiency evaporative distillation, comprising the steps of: feeding a feed hydrocarbon mixture pitch having a softening point in the range of 70° C. to 160° C. into a processing vessel wherein said processing vessel is heated to a temperature in the range of 300° C. to 600° C. and wherein a pressure inside said processing vessel is 5 Torr or less; and withdrawing an output hydrocarbon mixture pitch from said processing vessel, said output hydrocarbon mixture pitch having a softening point in the range of 140° C. to 180° C. and having less than 5% mesophase content.  
   
   
       50 . (canceled)  
   
   
       51 . A method according to  claim 49 , said output hydrocarbon mixture pitch having less than 1% mesophase content.  
   
   
       52 . A method according to  claim 49 , said feed hydrocarbon mixture pitch having a softening point in the range of 110° C. to 140° C.  
   
   
       53 . A method according to  claim 49 , wherein said processing vessel is heated to a temperature in the range of 350° C. to 500° C.  
   
   
       54 . (canceled)  
   
   
       55 . A method according to  claim 49 , said feeding step comprising introducing said feed hydrocarbon mixture pitch into a wiped film evaporator, said wiped film evaporator comprising said processing vessel.  
   
   
       56 . A method according to  claim 55 , wherein a feed rate of said feed hydrocarbon mixture pitch into said wiped film evaporator is in the range of 10 to 100 pounds/square foot of surface area/hour.  
   
   
       57 . A method according to  claim 55 , wherein a feed rate of said feed hydrocarbon mixture pitch into said wiped film evaporator is in the range of 35 to 50 pounds/square foot of surface area/hour.  
   
   
       58 . A method according to  claim 56 , wherein a residence time of said feed hydrocarbon mixture pitch in said processing vessel is in the range of 1 to 60 seconds.  
   
   
       59 . A method according to  claim 57 , wherein a residence time of said feed hydrocarbon mixture pitch in said processing vessel is in the range of 5 to 30 seconds.  
   
   
       60 . A method according to  claim 55 , wherein said wiped film evaporator forms a film of said feed hydrocarbon mixture pitch on an interior wall of said processing vessel, said film having a minimum thickness of 1 millimeter.  
   
   
       61 . A method according to  claim 49 , said feeding step comprising introducing said feed hydrocarbon mixture pitch into a thin film evaporator, said thin film evaporator comprising said processing vessel.  
   
   
       62 . A method according to  claim 61 , wherein a feed rate of said feed hydrocarbon mixture pitch into said thin film evaporator is in the range of 10 to 100 pounds/square foot of surface area/hour.  
   
   
       63 . A method according to  claim 61 , wherein a feed rate of said feed hydrocarbon mixture pitch into said thin film evaporator is in the range of 35 to 50 pounds/square foot of surface area/hour.  
   
   
       64 . A method according to  claim 62 , wherein a residence time of said feed hydrocarbon mixture pitch in said processing vessel is in the range of 1 to 60 seconds.  
   
   
       65 . A method according to  claim 63 , wherein a residence time of said feed hydrocarbon mixture pitch in said processing vessel is in the range of 5 to 30 seconds.  
   
   
       66 . A method according to  claim 61 , wherein said thin film evaporator forms a film of said feed hydrocarbon mixture pitch on an interior wall of said processing vessel, said feed hydrocarbon mixture pitch comprising a plurality of QI particles, said film having a minimum thickness that is no smaller than a thickness of a largest one of said QI particles.  
   
   
       67 . A method according to  claim 49 , said feeding step comprising introducing said feed hydrocarbon mixture pitch into a conventional distillation apparatus, said conventional distillation apparatus comprising said processing vessel.  
   
   
       68 . A method according to  claim 49 , said feed hydrocarbon mixture pitch comprising a mixture of coal tar pitch and petroleum pitch.  
   
   
       69 . A method according to  claim 68 , said feed hydrocarbon mixture pitch comprising at least 50% coal tar pitch.  
   
   
       70 . A method of making a pitch using high efficiency evaporative distillation, comprising the steps of: feeding a feed hydrocarbon mixture pitch having a softening point in the range of 70° C. to 160° C. into a processing vessel, wherein said processing vessel is heated to a temperature in the range of 300° C. to 600° C. and wherein a pressure inside said processing vessel is 5 Torr or less; withdrawing an output hydrocarbon mixture pitch from said processing vessel, said output hydrocarbon mixture pitch having a softening point in the range of 140° C. to 180° C. and having less than 5% mesophase content; and combining said output hydrocarbon mixture pitch with a plasticizer.  
   
   
       71 . A method according to  claim 70 , wherein said plasticizer comprises a coal tar having a viscosity in the range of 2 to 5 centistokes at 210° F. and a B(a)P equivalent of no more than 500 ppm B(a)P.  
   
   
       72 . A method according to  claim 71 , wherein said plasticizer comprises a mixture of said coal tar and a petroleum oil, said petroleum oil constituting 30% to 60% of said mixture.  
   
   
       73 . A method according to  claim 70 , said feeding step comprising introducing said feed hydrocarbon mixture pitch into a wiped film evaporator, said wiped film evaporator comprising said processing vessel.  
   
   
       74 . A method according to  claim 70 , said feeding step comprising introducing said feed hydrocarbon mixture pitch into a thin film evaporator, said thin film evaporator comprising said processing vessel.  
   
   
       75 . A method according to  claim 70 , said feeding step comprising introducing said feed hydrocarbon mixture pitch into a conventional distillation apparatus, said conventional distillation apparatus comprising said processing vessel.  
   
   
       76 . (canceled)  
   
   
       77 . A method according to  claim 70 , said feed hydrocarbon mixture pitch having a softening point in the range of 110° C. to 140° C.  
   
   
       78 . A method according to  claim 70 , wherein said processing vessel is heated to a temperature in the range of 350° C. and 500° C.  
   
   
       79 . A method according to  claim 70 , said feed hydrocarbon mixture pitch comprising a mixture of coal tar pitch and petroleum pitch.  
   
   
       80 . A method according to  claim 79 , said feed hydrocarbon mixture pitch comprising at least 50% coal tar pitch.  
   
   
       81 - 162 . (canceled)

Join the waitlist — get patent alerts

Track US2005263436A1 — get alerts on status changes and closely related new filings.

We store only your email — no account needed. See our privacy policy.