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:
Oct. 30, 2007
Filed:
Feb. 20, 2004
Shuhei Yada, Mie, JP;
Yasushi Ogawa, Mie, JP;
Yoshiro Suzuki, Mie, JP;
Kenji Takasaki, Mie, JP;
Kiyoshi Takahashi, Mie, JP;
Shuhei Yada, Mie, JP;
Yasushi Ogawa, Mie, JP;
Yoshiro Suzuki, Mie, JP;
Kenji Takasaki, Mie, JP;
Kiyoshi Takahashi, Mie, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
A distillation apparatus for subjecting a crude readily polymerizable compound to distillation under vacuum conditions to purify the same includes a distillation column and a vacuum generator, an exhaust gas conduit of the vacuum generator being connected to a connecting conduit therebetween through a pressure control valve. The purification method includes using the disclosed distillation apparatus and controlling the action of the pressure control valve based on a pressure of the distillation column, thereby controlling the amount of the exhaust gas to be introduced to control the pressure of the distillation column.