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. 09, 2007
Filed:
Mar. 01, 2006
Shuhei Yada, Yokkaichi, JP;
Yasushi Ogawa, Yokkaichi, JP;
Hirochika Hosaka, Yokkaichi, JP;
Yoshiro Suzuki, Yokkaichi, JP;
Mitsuo Nakamura, Yokkaichi, JP;
Shuhei Yada, Yokkaichi, JP;
Yasushi Ogawa, Yokkaichi, JP;
Hirochika Hosaka, Yokkaichi, JP;
Yoshiro Suzuki, Yokkaichi, JP;
Mitsuo Nakamura, Yokkaichi, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
In an apparatus capable of distilling and refining an easily polymerizable substance, piping is performed so that when a strainer in action is switched to a backup strainer, the strainer can be switched after removing air in the backup strainer to replace air in the backup strainer with a discharge liquid of a pump. According to the apparatus, switching the strainers installed on an upstream side of the pump for extracting a liquid of a vacuum distillation column, which distills and refines the easily polymerizable substance, can be performed with no trouble during operation of the distillation column. When the apparatus includes a device for measuring a differential pressure between an upstream side and a downstream side of the strainer in action, two or more strainers installed in parallel can be switched at proper times and the easily polymerizable substance can be produced efficiently.