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:
Apr. 25, 1978
Filed:
Jul. 12, 1976
Kao Soap Co., Ltd., Tokyo, JA;
Abstract
Sulfonation of a sulfonatable organic compound is effected by means of a two-stage reaction with an SO.sub.3 -containing gas, in which the first-stage reaction is carried out by flowing, in parallel flow relation, said organic compound and said SO.sub.3 -containing gas upwardly into the lower ends of a plurality of vertically positioned cylinders or double-cylinders, and the second-stage reaction is carried out by the steps of collecting the reaction product of the first-stage reaction, adding fresh SO.sub.3 -containing gas to the reaction product thus collected and flowing in parallel flow arrangement the reaction mixture downwardly into the upper end of a vertically positioned cylinder or double-cylinder.