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. 19, 1978
Filed:
Feb. 28, 1977
Applicant:
Inventor:
Wolfgang Muller, Marl, DE;
Assignee:
Chemische Werke Huls AG, Marl, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2606 / ; 203D / ; 203 99 ;
Abstract
Method for producing hexachlorocyclobutene from hexachlorobutadiene, wherein technical hexachlorobutadiene is rectified at a pressure of 2-10 mm Hg with a reflux ratio of 300-600, and the hexachlorobutadiene remaining in the sump during this procedure, after a heat treatment at 150.degree.-200.degree. C., is recycled into the rectifying column together with fresh, technical hexachlorobutadiene. The product rich in hexachlorocyclobutene, withdrawn overhead, is optionally subjected to a fractional crystallization.