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:
Nov. 20, 2001
Filed:
Aug. 22, 2000
Raymond Lawrence June, Singapore, SG;
Shell Oil Company, Houston, TX (US);
Abstract
In a process for producing aromatic dicarboxylic acids which incorporates the disproportionation of a salt of an aromatic mono- or dicarboxylic acid to produce the unreacted salt of an aromatic mono- or dicarboxylic acid and the salt of the desired aromatic dicarboxylic acid, a method is disclosed for separating the salt of the desired product from the unreacted salt which comprises passing both said unreacted salt and said salt of the desired product in an aqueous solution over an adsorbent comprising an activated carbon. The process is particularly suitable for separating potassium naphthoate from 2,6-K2NDA after potassium naphthoate is disproportionated to produce 2,6-K2NDA and 1- or 2-potassium naphthoate. The adsorbent can be regenerated by the use of a displacing agent and reused without off site regeneration.