Process for deodorising a mercapto acid by extracting malodorous compounds therefrom with carbon dioxide
AssigneeL'oreal
InventorsMichel Dedieu, Herve Burgaud, Eric LaPoirie, Veronique Gurfein, Gerard Malle
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Abstract
A process for deodorizing a mercapto acid or a polar solvent solution thereof includes extracting malodorous compounds present therein by extraction with carbon dioxide in gaseous, liquid or solid form. The mercapto acid has the formula HS-A-COOH wherein A represents ##STR1## wherein n is an integer ranging from 1-4 and R is linear or branched C.sub.1 -C.sub.3 alkyl.
Claims13
A process for deodorizing a mercapto acid by extraction of a greater part of malodorous decomposition products contained therein, said process comprising treating said mercapto acid with carbon dioxide at a temperature and pressure so as to maintain said carbon dioxide essentially outside a supercritical region bounded by a temperature of 31.degree. C. and a pressure of 73.8.times.10.sup.5 Pascals, said mercapto acid having the formula:
- HS--A--COOH (I)
- wherein
- A represents
- (i)--(CH.sub.2).sub.n --wherein n is an integer ranging from 1 to 4,
- (ii) ##STR4## wherein R represents linear or branched C.sub.1 -C.sub.3 alkyl, or (iii) ##STR5## said mercapto acid optionally being in the form of a solution in a polar solvent and said carbon dioxide being in gaseous, liquid or solid form.
Dependencies are inferred from the claim text.