Purification of amido-carboxylic acids

Details Purification of amido-carboxylic acids Purification of amido-carboxylic acids

1994-04-15

1995-02-28

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Fatty compounds having an acid moiety which contains the...

554 63, 554 68, C07C23124

Patent

active

053939050

ABSTRACT:
This invention relates to a four step process for purifying amido-carboxylic acids by liquid/liquid extraction from a reaction mixture containing an amido-carboxylic acid. The first step involves distilling impurities from a reaction mixture containing an amido-carboxylic acid to form a distillate residue. The second step involves mixing the distillate residue with a nonpolar hydrocarbon solvent wherein the mixture is maintained above the freezing point of the distillate residue. The third step involves allowing the hydrocarbon solvent and distillate residue to achieve phase separation of an organic phase containing the amido-carboxylic acid and an organic phase containing the nonpolar hydrocarbon solvent. The fourth step involves separating the organic phase containing the nonpolar hydrocarbon solvent from the organic phase containing the amido-carboxylic acid.

REFERENCES:
patent: 2453234 (1948-11-01), Keck
patent: 2881193 (1959-04-01), Epstein et al.
patent: 2956068 (1960-10-01), Dohr et al.

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