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:
May. 23, 1978
Filed:
Jul. 12, 1976
Applicant:
Inventors:
Hermann Richtzenhain, Much-Schellenbach, DT;
Paul Riegger, Troisdorf, Sieglar, DT;
Assignee:
Dynamit Nobel Aktiengesellschaft, Troisdorf Bez. Koeln, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2605 / ;
Abstract
Production of terephthalic acid dichloride and isophthalic acid dichloride by hydrolysis with water as a gas according to the following overall reaction: ##STR1## A Friedel-Crafts catalyst is used and some of the dichloride produced is maintained present throughout the reaction. The reaction is fast and the yield is high.