US2001033820A1PendingUtilityA1

Precipitated aragonite and a process for producing it

34
Priority: Mar 6, 2000Filed: Feb 8, 2001Published: Oct 25, 2001
Est. expiryMar 6, 2020(expired)· nominal 20-yr term from priority
Inventors:Isaac Yaniv
H01B 1/08C01P 2006/10C01P 2002/72B01J 20/28011A61Q 17/04B01J 20/043C05D 3/00C01F 11/183B01J 20/30C01F 11/182A23L 29/294C08K 2003/265A23P 10/43C01P 2004/10C08K 3/26C05D 3/02C01B 32/60A61Q 13/00A23L 27/77A23K 20/24D21H 17/675C11D 3/1233A61K 33/10A61K 8/19
34
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Claims

Abstract

Disclosed is a novel form of particulate precipitated aragonite, a novel process for producing it and compositions containing it.

Claims

exact text as granted — not AI-modified
1 . A process for producing a particulate precipitated aragonite calcium carbonate, which comprises reacting an aqueous calcium hydroxide slurry with a gas selected from the group consisting of carbon dioxide and a gas containing it, wherein the parameters of said process, including at least one preselected active agent, mode of operation, operating concentrations of raw materials, operating temperature, operating mixer speed and operating pH, are such that (A) the specific gravity of the product after drying for 12 hours at 120° C. is <2.5 g/cm 3 ; and (B) the specific gravity of this dry product after ignition for eight hours at 500° C. is <2.5 g/cm 3 .  
     
     
         2 . A process according to    claim 1   , in which said at least one active agent is selected from the group consisting of carboxylic acids of formula RCOOH, where R is an organic group containing 7-20 carbon atoms, their carboxylate salts, their acid anhydrides, their esters, their acyl halides and their ketenes.  
     
     
         3 . A process according to    claim 2   , in which said at least one active agent is selected from the group consisting of carboxylic acids of formula C n H 2n+1 COOH, where n is 8-17, their carboxylate salts, their acid anhydrides, their esters, their acyl halides and their ketenes of the formula C n H 2n+1 C═C═O, where n is 7-16.  
     
     
         4 . A process according to    claim 2   , which is further characterized by the following features: 
 (a) said at least one active agent is selected from the group consisting of carboxylic acids of formula CH 3 (CH 2 ) n COOH, where n is 7-16, their carboxylate salts, their acid anhydrides, their esters, their acyl halides and their ketenes of the formula CH 3 (CH 2 ) n C═C═O, where n is 6-15;    (b) said concentration of the at least one active agent is within the range between 0.2 wt. % and 10 wt. %, calculated as carboxylic acid(s) and based on the weight of calcium carbonate;    (c) said slurry contains calcium hydroxide in a concentration within the range of from 3 to 30 wt. %;    (d) said pH is within the range of from 8 to 11;    (e) said temperature is in the range between 60° C. and the boiling temperature of the reaction mixture;    (f) said mode of operation is selected from a continuous and a semi-continuous (intermittent) mode of operation;    (g) said mixer peripheral speed (tip-speed) is above 5 m/sec.;    (h) said at least one active agent is added in a manner selected from introduction into the carbonation reactor and premixing with said calcium hydroxide slurry prior to reaction with said gas.    
     
     
         5 . A process according to    claim 4   , which is further characterized by at least one of the following features: 
 (a) said at least one active agent is selected from the group consisting of carboxylic acids of formula CH 3 (CH 2 ) n COOH, where n is 7-16, and the calcium salts thereof;    (b) said concentration of the at least one active agent is within the range between 0.3 wt. % and 5 wt. %, calculated as carboxylic acid(s) and based on the weight of calcium carbonate;    (c) said slurry contains calcium hydroxide in a concentration within the range of from 4 to 20 wt. %;    (d) said pH is within the range of from 9 to 10;    (e) said temperature is in the range between 80° C. and the boiling temperature of the reaction mixture;    (f) said mode of operation is a continuous mode of operation.    
     
     
         6 . A process according to    claim 5   , which is further characterized by at least one of the following features, namely: 
 (a) said active agent is selected from the group consisting of decanoic acid and the calcium salts thereof,    (b) said concentration of said at least one active agent is within the range between 0.4 wt. % and 3 wt. %, calculated as carboxylic acid and based on the weight of calcium carbonate,    (c) said temperature is in the range between 90° C. and the boiling temperature of the reaction mixture, and    (d) said slurry contains calcium hydroxide in a concentration within the range of from 5 to 15 wt. %.    
     
     
         7 . A process according to    claim 2   , which is further characterized by at least feature (a) of the following features: 
 (a) said at least one active agent is selected from the group consisting of carboxylic acids of formula C n H 2n−1 COOH, where n is 8-17, their carboxylate salts, their acid anhydrides, their esters, their acyl halides and their ketenes of the formula C n H 2n−1 C═C═O, where n is 7-16;    (b) said concentration of the at least one active agent is within the range between 0.2 wt. % and 10 wt. %, calculated as carboxylic acid(s) and based on the weight of calcium carbonate;    (c) said slurry contains calcium hydroxide in a concentration within the range of from 3 to 30 wt. %;    (d) said pH is within the range of from 8 to 11;    (e) said temperature is in the range between 60° C. and the boiling temperature of the reaction mixture;    (f) said mode of operation is selected from a continuous and a semi-continuous (intermittent) mode of operation;    (g) said mixer peripheral speed (tip-speed) is above 5 m/sec.;    (h) said at least one active agent is added in a manner selected from introduction into the carbonation reactor and premixing with said calcium hydroxide slurry prior to reaction with said gas.    
     
     
         8 . A process according to    claim 7   , which is further characterized by at least one of the following features, namely: 
 (a) said active agent is selected from the group consisting of undecylenic acid and the calcium salts thereof,    (b) said concentration of said at least one active agent is within the range between 0.4 wt. % and 3 wt. %, calculated as carboxylic acid and based on the weight of calcium carbonate,    (c) said temperature is in the range between 90° C. and the boiling temperature of the reaction mixture, and    (d) said slurry contains calcium hydroxide in a concentration within the range of from 5 to 15 wt. %.    
     
     
         9 . A process according to    claim 1   , which is conducted as a flotation process in a flotation cell.  
     
     
         10 . A process according to    claim 9   , and substantially as hereinbefore described with reference to FIG. 3 of the attached drawings.  
     
     
         11 . A particulate precipitated aragonite produced by the process of    claim 1   .  
     
     
         12 . A particulate precipitated aragonite according to    claim 11   , which is characterized by at least one of the following features: 
 (i) it contains at least one calcium salt of carboxylic acids selected from those of the general formulae C n H 2n+1 COOH and C n H 2n−1 COOH, where n is 8-17, in an amount between 0.2 and 10 wt. %, calculated as carboxylic acid(s) and based on the weight of calcium carbonate;    (ii) it has an XRD spectrum substantially in accordance with FIG. 5 of the attached drawings.    
     
     
         13 . A particulate precipitated aragonite according to    claim 12   , which contains at least one calcium salt of carboxylic acids selected from those of the general formula: CH 3 (CH 2 ) n COOH, where n=7-16, in an amount between 0.2 and 10 wt. %, calculated as carboxylic acid(s) and based on the weight of calcium carbonate.  
     
     
         14 . A particulate precipitated aragonite according to    claim 11   , having a specific gravity <2.3 g/cm 3  after drying at 120° C. for twelve hours, and a specific gravity <2.3 g/cm 3  after ignition for eight hours at 500° C.  
     
     
         15 . A particulate precipitated aragonite according to    claim 14   , having a specific gravity <2.0 g/cm 3  after drying at 120° C. for twelve hours.  
     
     
         16 . A particulate precipitated aragonite according to    claim 15   , having a specific gravity <1.8 g/cm 3  after drying at 120° C. for twelve hours.  
     
     
         17 . A particulate precipitated aragonite according to    claim 16   , having a specific gravity <1.5 g/cm 3  after drying at 120° C. for twelve hours.  
     
     
         18 . A particulate precipitated aragonite according to    claim 11   , having a specific gravity <2.1 g/cm 3  after drying at 120° C. for twelve hours, and a specific gravity <2.1 g/cm 3  after ignition for eight hours at 500° C.  
     
     
         19 . A particulate precipitated aragonite which has (A) a specific gravity <2.5 g/cm 3  after drying for 12 hours at 120° C., and (B) a specific gravity <2.5 g/cm 3  after ignition for eight hours at 500° C. of the product dried in (A).  
     
     
         20 . A particulate precipitated aragonite which has (A) a specific gravity <2.3 g/cm 3  after drying at 120° C., and (B) a specific gravity <2.3 g/cm 3  after ignition for eight hours at 500° C. of the product dried in (A).  
     
     
         21 . A particulate precipitated aragonite which has a specific gravity <2.1 g/cm 3  after drying at 120° C. for twelve hours, and a specific gravity <2.1 g/cm 3  after ignition for eight hours at 500° C.  
     
     
         22 . A particulate precipitated aragonite which has (A) a specific gravity <1.8 g/cm 3  after drying at 120° C., and (B) a specific gravity <2.3 g/cm 3  after ignition for eight hours at 500° C. of the product dried in (A).  
     
     
         23 . A particulate precipitated aragonite which has (A) a specific gravity <1.5 g/cm 3  after drying at 120° C., and (B) a specific gravity <2.3 g/cm 3  after ignition for eight hours at 500° C. of the product dried in (A).  
     
     
         24 . A particulate precipitated aragonite which has (A) a specific gravity <1.5 g/cm 3  after drying at 120° C., and (B) a specific gravity <2.1 g/cm 3  after ignition for eight hours at 500° C. of the product dried in (A).  
     
     
         25 . A particulate precipitated aragonite which has a specific gravity <2.5 g/cm 3  after ignition for eight hours at 500° C.  
     
     
         26 . A particulate precipitated aragonite which has a specific gravity <2.3 g/cm 3  after ignition for eight hours at 500° C.  
     
     
         27 . A particulate precipitated aragonite which has a specific gravity <2.1 g/cm 3  after ignition for eight hours at 500° C.  
     
     
         28 . A particulate precipitated aragonite according to any one of    claims 19    to    27   , which is characterized by at least one of the following features: 
 (i) it contains at least one calcium salt of carboxylic acids selected from those of the general formulae C n H 2n+1 COOH and C n H 2n−1 COOH, where n is 8-17, in an amount between 0.2 and 10 wt. %, calculated as carboxylic acid(s) and based on the weight of calcium carbonate;  
 (ii) it has an XRD spectrum substantially in accordance with FIG. 5 of the attached drawings.  
 
     
     
         29 . A particulate precipitated aragonite according to    claim 28   , which contains at least one calcium salt of carboxylic acids selected from those of the general formula: CH 3 (CH 2 ) n COOH, where n=7-16, in an amount between 0.2 and 10 wt. %, calculated as carboxylic acid(s) and based on the weight of calcium carbonate.  
     
     
         30 . A particulate precipitated aragonite according    claim 28   , which contains at least one calcium salt of carboxylic acids selected from those of the general formula: C n H 2n−1 COOH, where n is 8-17, in an amount between 0.2 and 10 wt. %, calculated as C n H 2n−1 COOH and based on the weight of calcium carbonate.  
     
     
         31 . A particulate precipitated aragonite according to any one of    claims 11    to    27   , of crystallographic purity (aragonite/(aragonite+calcite)) at least 90%.  
     
     
         32 . A particulate precipitated aragonite according to any one of    claims 11    to    27   , of crystallographic purity (aragonite/(aragonite+calcite))<90%.  
     
     
         33 . A process according to any one of    claims 1    to    10   , wherein said specific gravity is determined substantially as described in Example 14(F).  
     
     
         34 . A particulate precipitated aragonite according to any one of    claims 11    to    27   , wherein said specific gravity is determined substantially as described in Example 14(F).  
     
     
         35 . A coating composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         36 . A coating composition according to    claim 35   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         37 . A coating composition according to    claim 35   , which comprises particulate precipitated aragonite in aqueous dispersion.  
     
     
         38 . A paper composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         39 . A paper composition according to    claim 38   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         40 . A paper composition according to    claim 38   , which comprises particulate precipitated aragonite in aqueous dispersion.  
     
     
         41 . A plastics composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         42 . A plastics composition according to    claim 41   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         43 . A rubber composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         44 . A rubber composition according to    claim 43   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         45 . An adsorbent composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         46 . An adsorbent composition according to    claim 45   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         47 . A powder detergent composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         48 . A powder detergent composition according to    claim 47   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         49 . A pharmaceutical composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         50 . A pharmaceutical composition according to    claim 49   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         51 . A pharmaceutical composition according to    claim 49   , which comprises particulate precipitated aragonite in aqueous dispersion.  
     
     
         52 . An agrochemical composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         53 . An agrochemical composition according to    claim 52   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         54 . An agrochemical composition according to    claim 52   , which comprises particulate precipitated aragonite in aqueous dispersion.  
     
     
         55 . A flavor composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         56 . A flavor composition according to    claim 55   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         57 . A flavor composition according to    claim 55   , which comprises particulate precipitated aragonite in aqueous dispersion.  
     
     
         58 . A fragrance composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         59 . A fragrance composition according to    claim 58   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         60 . A fragrance composition according to    claim 58   , which comprises particulate precipitated aragonite in aqueous dispersion.  
     
     
         61 . A food composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         62 . A food composition according to    claim 61   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         63 . A food composition according to    claim 61   , which comprises particulate precipitated aragonite in aqueous dispersion.  
     
     
         64 . A feed composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         65 . A feed composition according to    claim 64   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         66 . A feed composition according to    claim 64   , which comprises particulate precipitated aragonite in aqueous dispersion.  
     
     
         67 . A sunscreen composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         68 . A sunscreen composition according to    claim 67   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         69 . A sunscreen composition according to    claim 67   , which comprises particulate precipitated aragonite in aqueous dispersion.  
     
     
         70 . A conductive powder composition which comprises a particulate precipitated aragonite as defined in any one of    claims 11    to    27   .  
     
     
         71 . A conductive powder composition according to    claim 70   , which comprises substantially dry particulate precipitated aragonite.  
     
     
         72 . A particulate precipitated aragonite, which after drying it for 12 hours at 120° C., has a Loose Bulk Density (L.B.D.)<0.4 g/cm 3 .  
     
     
         73 . A particulate precipitated aragonite according to    claim 72   , wherein said L.B.D. is determined substantially as described in Example 14(G).

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