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:
Aug. 07, 2007
Filed:
Jan. 29, 2003
Hiroyuki Uhara, Tatsuno, JP;
Kazuo Anyouji, Himeji, JP;
Hideyuki Hironaka, Himeji, JP;
Hideo Onodera, Himeji, JP;
Hiroyuki Uhara, Tatsuno, JP;
Kazuo Anyouji, Himeji, JP;
Hideyuki Hironaka, Himeji, JP;
Hideo Onodera, Himeji, JP;
Nippon Shokubai Co., Ltd, Osaka-shi, Osaka, JP;
Abstract
This invention is related to a shell-and-tube type reactor provided with reaction tubes packed with a catalyst and adapted to circulate a heat medium to the fluid outside the tubes and is characterized by a method introducing a gas into the catalyst beds so as to retain the relative humidity of the catalyst in the range of more than 40% while elevating the temperature of the reactor thereby starting up the reactor. This method prevents the catalyst from degradation of activity due to absorption of moisture, exalts the service life of the catalyst, and permits stable production of methacrylic acid.