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:
Jul. 04, 1995
Filed:
May. 18, 1994
Hiroaki Kandori, Yotsukaichi, JP;
Nobuyuki Murai, Yotsukaichi, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
A process for preparing diacetoxybutene, including: reacting butadiene, acetic acid and oxygen in the presence of a palladium-based catalyst; feeding continuously the resulting reaction product into a first distillation tower; feeding continuously a withdrawn bottoms withdrawn from the first distillation tower into a second distillation tower; withdrawing bottoms containing high boiling point materials from the bottom of the second distillation tower, so that the content of the high boiling point materials in the bottoms of the second distillation tower is not more than 20 wt %; feeding continuously the withdrawn bottoms into a thin-film evaporator whose internal pressure is kept lower than the bottom pressure of the second distillation tower to carry out evaporation treatment; and recycling the evaporated materials mainly containing diacetoxybutene into the second distillation tower.