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US 9,517,996 B2Granted
Purification of polycarboxylic acids
AssigneeVerdezyne, Inc.
InventorsJose Laplaza, William Andrew Evanko, Jason H. Radany
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Abstract
A process for purifying a polycarboxylic acid from a mixture is provided. Optionally, the mixture is an aqueous solution and optionally the process comprises an acidification step and/or the use of one or more organic solvents. Also provided in part are compositions of polycarboxylic acids.
Claims15
A method for purifying a polycarboxylic acid of interest from an aqueous mixture, comprising:
- (a) contacting the aqueous mixture comprising the polycarboxylic acid with at least one acid such that the polycarboxylic acid is precipitated from said aqueous mixture;
- (b) contacting the precipitated polycarboxylic acid with at least one organic solvent at one or more selected temperatures;
- (c) separating the polycarboxylic acid from the at least one organic solvent;
- and (d) collecting the purified polycarboxylic acid.
1 more element
Dependencies are inferred from the claim text.