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:
Jul. 13, 1976
Filed:
Nov. 18, 1974
Osamu Okumura, Funabashi, JA;
Takenobu Sakatani, Chiba, JA;
Kazuo Ohbu, Tokyo, JA;
Masuzo Nagayama, Tokyo, JA;
Lion Fat & Oil Co., Ltd., Tokyo, JA;
Abstract
A neutralized product containing salt of .alpha.-sulfofatty acid ester in high concentration can be produced by the method comprising the steps of (1) sulfonating fatty acid ester by contacting a gaseous mixture of sulfur trioxide (SO.sub.3) and an inert gas containing 1 - 15% by volume of SO.sub.3 with a film of a fatty acid ester, said ester having the formula RCH.sub.2 COOR' (wherein R is alkyl having 8 - 18 carbon atoms and R' is alkyl having 1 - 5 carbon atoms), under the conditions that the molar ratio of SO.sub.3 to said fatty acid ester is in the range of 1.0 - 1.5, the temperature is in the range of 50.degree. - 85.degree.C and the time of contact is in the range of 0.5 - 30 seconds; (2) contacting a film of the reaction product obtained by step (1) into contact with said gaseous mixture, under the conditions of a temperature in the range of 95 - 150.degree.C and a time of contact in the range of 3 - 120 seconds; and (3) instantly neutralizing the reaction product obtained by step (2) with a base selected from the group consisting of an aqueous solution of alkali metal hydroxide, ammonia water and ethanol amine while retaining the condition that the pH value is in the range of 6 - 10 and the temperature is less than 70.degree.C. This neutralized product is usable as the active ingredient a detergent without subjecting it to any further treatment.