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:
Sep. 25, 2001
Filed:
Jun. 02, 1999
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
The present invention provides a production process for an ether carboxylate salt in which process the ether carboxylate salt is obtainable with a good yield, and the amount of expensive catalyst, as used, can be saved, and the recovery of the catalyst is easy. The production process for an ether carboxylate salt comprises the etherification step of reacting a hydroxyl-group-containing organic compound and a carboxyl-group-containing organic compound in an aqueous medium in the presence of a catalyst containing a rare earth element, wherein the carboxyl-group-containing organic compound is at least one compound selected from the group consisting of carboxyl-group-containing unsaturated organic compounds and carboxyl-group-containing epoxy compounds. This process is characterized in that the pH of the aqueous medium is in the range of 9˜13, but not including 9, and in that the amount of the catalyst, as used, is in the range of 0.0001˜0.4 mol per 1 mol of the carboxyl-group-containing organic compound. After the etherification step, the rare earth element is separated and recovered in the form of a water-insoluble salt. In the etherification step, the resultant ether compound is deposited in the course of the reaction.