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:
Apr. 30, 2002
Filed:
Aug. 03, 1999
Seinosuke Satoh, Kurashiki, JP;
Yukio Tanigawa, Kurashiki, JP;
Asahi Kasei Kabushiki Kaisha, Tokyo, JP;
Abstract
A process for producing methylal that involves feeding a liquid containing methanol, formaldehyde and water to an uppermost reactor of at least four solid acid catalyst-filled reactors which are each externally connected to an intermediate portion of a distillation column; and forcibly circulating a liquid containing methanol, formaldehyde, water and produced methylal in a temperature range of 80° C. to 100° C. between the distillation column and each reactor connected to the distillation column below said uppermost reactor, whereby the vapor in the distillation column, which vapor has been subjected to vapor-liquid contact with the liquid containing methanol, formaldehyde, water and produced methylal and which liquid has been subjected to solid-liquid contact in a lowermost reactor of the reactors connected to the intermediate portion of the distillation column, is successively subjected to vapor-liquid contact with the liquids containing methanol, formaldehyde, water and produced methylal circulated between the distillation column and each reactor connected to the distillation column above said lowermost reactor in which the above vapor phase is successively increased.