Preparation of salt-free N-acyl taurines
AssigneeGAF Corporation
InventorParitosh M. Chakrabarti
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Abstract
A process for preparing a substantially salt free N-acyl taurine by reacting 1 mole of a higher molecular weight carboxylic acid chloride with 1 mole of a taurine salt containing at least 1 N-bonded H atom in a lower alkanol initially containing no more than about 15% by weight of water and about 1 mole of an alkali metal hydroxide at elevated temperatures, preferably at reflux, separating the insoluble precipitated alkali metal chloride from the alkanolic reaction medium at a temperature high enough to solubilize the N-acyl taurine reaction product, and cooling the reaction medium low enough to precipitate the desired N-acyl taurine.
Claims11
A process for preparing an N-acyl taurine substantially free of alkali metal chloride comprising reacting, in a C.sub.1-4 alkanol medium initially containing no more than about 15% by weight of water, at temperatures ranging from about 30.degree. C. up to reflux, 1 mole of a C.sub.6-22 carboxylic acid chloride with 1 mole of a taurine salt of the formula
- HNR.sup.1 --CHR.sup.2 --CHR.sup.2 --SO.sub.3 M
- wherein
- R.sup.1 is H or a C.sub.1-6 hydrocarbon radical,
- R.sup.2 is independently H, methyl or ethyl, and
- M is alkali metal,
- in the presence of about 1 mole of alkali metal hydroxide, separating the precipitated alkali metal chloride from the alkanolic reaction mixture while maintaining the temperature thereof high enough to solubilize the N-acyl taurine reaction product, and then cooling the reaction medium low enough to precipitate the desired N-acyl taurine.
Dependencies are inferred from the claim text.