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:
Jun. 13, 1978
Filed:
Mar. 07, 1977
Applicant:
Inventor:
Yasuo Tanabe, Kurashiki, JA;
Assignee:
Mitsubishi Chemical Industries, Ltd., Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
26034611 ;
Abstract
This invention relates to a process for preparing tetrahydrofuran or dihydrofuran by reacting an acetic acid ester of 1,4-butanediol or 1,4-dihydroxybutene-2 and water in the presence of an acid catalyst with a high yield. The process is characterized in that the reaction is carried out in two separate reaction zone in combination with a plurality of distilling columns and a part of reaction product is recycled to a predetermined position of the reaction zone.