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:
Jan. 06, 2009
Filed:
Jul. 26, 2005
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 it, the distillation apparatus having a distillation column and a vacuum generator and an exhaust gas conduit of the vacuum generator connected to a connecting conduit therebetween through a pressure control valve. A method provides purifying of a readily polymerizable compound by subjecting a crude readily polymerizable compound to distillation under vacuum conditions to purify it, the method including using a distillation apparatus having a distillation column and a vacuum generator and an exhaust gas conduit of the vacuum generator connected to a connecting conduit therebetween through a pressure control valve and controlling the action of the pressure control valve based on a pressure of the distillation column.