Recovery of organic acids
First Claim
Patent Images
1. A method for recovery of an organic acid from a dilute salt solution comprising an organic acid salt, the cation of which forms an insoluble carbonate salt, comprising:
- a. introducing a tertiary amine and CO2 to the dilute salt solution to form an acid/amine complex and the insoluble carbonate salt;
b. introducing a water immiscible solvent to the dilute salt solution to form a reaction phase comprising the acid/amine complex and the water immiscible solvent;
c. continuously drying the reaction phase; and
d. forming a product of the acid and the water immiscible solvent.
4 Assignments
0 Petitions
Accused Products
Abstract
A method is disclosed for the recovery of an organic acid from a dilute salt solution in which the cation of the salt forms an insoluble carbonate salt. A tertiary amine and CO2 are introduced to the solution to form the insoluble carbonate salt and a complex between the acid and an amine. A water immiscible solvent, such as an alcohol, is added to extract the acid/amine complex from the dilute salt solution to a reaction phase. The reaction phase is continuously dried and a product between the acid and the solvent, such as an ester, is formed.
-
Citations
35 Claims
-
1. A method for recovery of an organic acid from a dilute salt solution comprising an organic acid salt, the cation of which forms an insoluble carbonate salt, comprising:
-
a. introducing a tertiary amine and CO2 to the dilute salt solution to form an acid/amine complex and the insoluble carbonate salt; b. introducing a water immiscible solvent to the dilute salt solution to form a reaction phase comprising the acid/amine complex and the water immiscible solvent; c. continuously drying the reaction phase; and d. forming a product of the acid and the water immiscible solvent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 34)
-
-
31. A method for recovery of an organic acid from a dilute salt solution comprising a calcium salt of an organic acid, comprising:
-
a. introducing a tertiary amine and CO2 to the dilute salt solution to form an acid/amine complex and calcium carbonate; b. mixing the dilute salt solution with a water immiscible alcohol having a distribution coefficient of at least about 0.5, whereby the acid/amine complex is extracted into the water immiscible alcohol; c. continuously drying the water immiscible alcohol; and d. forming an ester from the acid and the water immiscible alcohol to produce a mixture comprising the ester, residual water immiscible alcohol, and the tertiary amine.
-
-
32. A method for recovery of an organic acid selected from the group consisting of acetic acid, lactic acid, and propionic acid from a fermentation broth comprising a calcium salt of the organic acid, comprising:
-
a. introducing a tertiary amine selected from the group consisting of tributylamine and dicyclohexyl methyl amine and CO2 to the dilute salt solution to form an acid/amine complex and calcium carbonate; b. mixing the dilute salt solution with a water immiscible alcohol selected from the group consisting of octanol, hexanol, pentanol, and butanol, whereby the acid/amine complex is extracted into the water immiscible alcohol; c. continuously drying the water immiscible alcohol; d. forming an ester from the acid and the water immiscible alcohol to produce a mixture comprising the ester, residual water immiscible alcohol, and the tertiary amine; e. separating the ester, the tertiary amine and the water immiscible alcohol; f. using the separated tertiary amine as the tertiary amine in step (a); g. using the separated water immiscible alcohol as the water immiscible alcohol in step (b); h. treating the ester by a process selected from the group consisting of i. hydrogenating the ester to form an alcohol of the acid and regenerate the solvent alcohol;
p2 ii. transesterifying the ester with a second alcohol to form a second ester;iii. hydrolyzing the ester to form the acid and regenerate the solvent alcohol.
-
-
33. A method for recovery of an organic acid from an acid/amine complex in an aqueous solution, comprising:
-
a. introducing a water immiscible solvent to the aqueous solution to form a reaction phase comprising the acid/amine complex and the water immiscible solvent and an aqueous phase; b. continuously drying the reaction phase; and c. forming a product of the acid and the water immiscible solvent.
-
-
35. A method for recovery of an organic acid from a dilute salt solution comprising an organic acid salt, the cation of which forms an insoluble carbonate salt, comprising:
-
a. introducing a tertiary amine and CO2 to the dilute salt solution to form an acid/amine complex and the insoluble carbonate salt; b. introducing n-butanol to the dilute salt solution to form a reaction phase comprising the acid/amine complex and the n-butanol; c. continuously drying the reaction phase; and d. forming an ester of the acid and the n-butanol by adding a strong reactive acid catalyst to the solvent, said strong reactive acid catalyst selected from the group consisting of sulfuric acid, hydrochloric acid and methane sulfonic acid.
-
Specification