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:
Aug. 08, 1978
Filed:
Jan. 28, 1977
Yasuo Tanabe, Kurashiki, JP;
Mitsubishi Chemical Industries Ltd., Tokyo, JP;
Abstract
A process for producing tetrahydrofuran or dihydrofuran from an acetic ester of 1,4-butanediol or 1,4-dihydroxybutene-2 is disclosed in which the raw material liquid acetic ester and steam are reacted in the presence of an acid catalyst in a plurality of reaction zones in liquid-gas countercurrent contact, a gaseous fraction containing the product cyclic ether is recycled to the preceding reaction zone while a liquid fraction containing unreacted raw material is transferred into the succeeding zone and the product cyclic ether is recovered from the gaseous fraction discharged from the first zone by distillation whereby the conversion of the acetic ester into the cyclic ether is improved.