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:
May. 06, 2008
Filed:
Sep. 26, 2006
Shuhei Yada, Yokkaichi, JP;
Yasushi Ogawa, Yokkaichi, JP;
Yoshiro Suzuki, Yokkaichi, JP;
Kimikatsu Jinno, Yokkaichi, JP;
Hirochika Hosaka, Yokkaichi, JP;
Kenji Takasaki, Yokkaichi, JP;
Masayasu Goriki, Yokkaichi, JP;
Shuhei Yada, Yokkaichi, JP;
Yasushi Ogawa, Yokkaichi, JP;
Yoshiro Suzuki, Yokkaichi, JP;
Kimikatsu Jinno, Yokkaichi, JP;
Hirochika Hosaka, Yokkaichi, JP;
Kenji Takasaki, Yokkaichi, JP;
Masayasu Goriki, Yokkaichi, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
In the stopping and starting operations of a distillation column used for producing (meth)acrylic acids according to the present invention, upon stopping the operation of the distillation column, the heating of a reboiler attached thereto is interrupted and then the reboiler is rapidly cooled; and/or upon starting the operation of the distillation column for production of the (meth)acrylic acids, an inner wall surface of the distillation column is heated to a temperature higher than a condensation temperature of the (meth)acrylic acids and the operation of the distillation column is started under the heated condition. According to the present invention, it is possible to early and safely stop the operation of the distillation column while preventing the occurrence of polymerization within the distillation column, and stably perform an operation for distillation of acrylic monomers for a long period of time.