The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 17, 1989
Filed:
Jun. 15, 1987
Hans-Joachim Richtler, Moenchengladbach, DE;
Udo Kreutzer, Monheim, DE;
Franz-Josef Carduck, Haan, DE;
Klaus Koester, Langenfeld, DE;
Hubert Harth, Duesseldorf, DE;
Henkel Kommanditgesellschaft auf Aktien, Duesseldorf, DE;
Abstract
For the production of solid, substantially anhydrous alkali metal salts of .alpha.-sulfofatty acid alkyl esters containing from 8 to 22 carbon atoms in the fatty acid chain and from 1 to 6 carbon atoms in the ester alkyl radical, solid or molten .alpha.-sulfofatty acid alkyl esters are simltaneously mixed with an aqueous solution of hydrogen peroxide or an H.sub.2 O.sub.2 -yielding compound and with solid alkali metal carbonate at a temperature of from 20.degree. to 80.degree. C. optionally in the presence of aqueous alkali metal hydroxide, the ratio by weight of ester of H.sub.2 O.sub.2 being from 1:0.01 to 1:0.06 and the molar ratio of ester to alkali metal carbonate being in the range of from 1:0.5 to 1:0.75, the foam formed through the release of CO.sub.2 is mechanically destroyed under a pressure of from 0.2 to 1.0 bar and at a temperature of from 50.degree. to 70.degree. C., and the product formed is residually degassed and residually dehydrated under a pressure of from 15 to 50 mbar and a temperature of from 50.degree. to 80.degree. C.