Process for purifying an organic acid

Details Process for purifying an organic acid Process for purifying an organic acid

2005-09-13

2005-09-13

Drodge, Joseph (Department: 1723)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C210S650000, C210S663000, C210S806000, C435S139000, C562S589000

Reexamination Certificate

active

06942803

ABSTRACT:
A process is disclosed for purifying an aqueous feed stream comprising a product organic acid, such as lactic acid, and a strong contaminant, such as pyruvic acid or oxalic acid. The molar concentration of the product organic acid in the feed stream typically is at least 20 times greater than the molar concentration of the strong contaminant. The aqueous feed stream is contacted with a first immiscible basic extractant that has at least a 3-fold greater affinity for the strong contaminant than for the product organic acid. The majority of the strong contaminant and some product organic acid become complexed with the first immiscible basic extractant. The complexed first immiscible basic extractant is separated from the aqueous stream, thereby producing a first effluent stream that comprises product organic acid and that has a greater ratio of molar product organic acid to molar strong contaminant than the aqueous feed stream did. The complexed first immiscible basic extractant is contacted with a displacing acid. The first immiscible basic extractant has a greater affinity for the displacing acid than it does for the strong contaminant or the product organic acid, and as a result, product organic acid and strong contaminant are displaced over a period of time from the complexed first immiscible basic extractant, producing a second effluent stream that comprises a major amount of product organic acid and a third effluent stream that comprises a major amount of strong contaminant.

REFERENCES:
patent: 2568095 (1951-09-01), Smith et al.
patent: 4082788 (1978-04-01), Mims
patent: 4275234 (1981-06-01), Baniel et al.
patent: 4291007 (1981-09-01), Baniel
patent: 4334095 (1982-06-01), Baniel
patent: 4994609 (1991-02-01), Baniel et al.
patent: 5068418 (1991-11-01), Kulprathipanja et al.
patent: 5068419 (1991-11-01), Kulprathipanja et al.
patent: 5210294 (1993-05-01), Mantovani et al.
patent: 5231225 (1993-07-01), Baniel et al.
patent: 5426220 (1995-06-01), Baniel et al.
patent: 5574180 (1996-11-01), McQuigg et al.
patent: 5641406 (1997-06-01), Sarhaddar et al.
patent: 5780276 (1998-07-01), Baniel
patent: 5786185 (1998-07-01), Tsao et al.
patent: 5892109 (1999-04-01), Baniel et al.
patent: 5959144 (1999-09-01), Baniel
patent: 5986133 (1999-11-01), Holtzapple et al.
patent: 6001255 (1999-12-01), Eyal et al.
patent: 6087532 (2000-07-01), Baniel et al.
patent: 6111137 (2000-08-01), Suizu et al.
patent: 6147259 (2000-11-01), Cami et al.
patent: 6280985 (2001-08-01), Caboche et al.
patent: 6320077 (2001-11-01), Eyal et al.
patent: 6478965 (2002-11-01), Holtzapple et al.
patent: 6489508 (2002-12-01), Van Gansbeghe et al.
patent: 6509179 (2003-01-01), Veldhuis-Stribos et al.
patent: 0 049 429 (1982-04-01), None
PCT/US02/39620 International Search Report (Mar. 28, 2003).
Tamada et al.,Ind. Eng. Chem. Res. 29:1327-1333 (1990).
Tamada et al.,Ind. Eng. Chem. Res. 29:1333-1338 (1990).
Shevchenko et al.,Russian Journal of Inorganic Chemistry8:268-271 (Feb. 1963).
Schügerl et al.,International Chemical Engineering32:29-40 (Jan. 1992).
Tamada et al.,Ind. Eng. Chem. Res. 29:1319-1326 (1990).
Tung et al.,Ind. Eng. Chem. Res. 33:3224-3229 (Dec. 1994).
Tung et al.,Ind. Eng. Chem. Res. 33:3217-3223 (1994).
San-Martin et al.,J. Chem. Tech. Biotechnol. 54:1-6 (1992).
Procházka et al.,Ind. Eng. Chem. Res. 33:1565-1573 (1994).
Poole et al.,Ind. Eng. Chem. Res. 30:223-929 (1991).
Miller et al.,Ind. Eng. Chem. Res. 35:1156-1162 (1996).
Kulprathipanja et al.,Separation Technology, Vansant ed., Elsevier Science B.V., pp. 373-382 (1994).
Juang et al.,Ind. Eng. Chem. Res. 35:1944-1950 (1996).
Kertes et al.,Biotechnology and Bioengineering28:269-282 (1986).
King,Chemitech, pp. 285-291 (May 1992).
Chanda et al.,Reactive Polymers4:39-48 (1985).
Evangelista et al.,Applied Biochemistry and Biotechnology45:134-144 (1994).

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