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Title:
メタクリル酸の製造方法
Document Type and Number:
Japanese Patent JP5892826
Kind Code:
B2
Abstract:
An object of the present invention is to provide a process for producing methacrylic acid with good productivity over a long period of time. The present invention provides a process for producing methacrylic acid by oxidizing methacrolein with oxygen in a continuous manner, comprising supplying a mixed gas containing methacrolein, isobutylene and oxygen and having a content of isobutylene of 300 to 3000 volume ppm, initiating the oxidation so that the methacrolein conversion at an outlet of a reactor becomes at least 85% and, thereafter, continuing the oxidation while the mixed gas having a content of isobutylene of 300 to 3000 volume ppm is supplied until a difference (X1−X2) between methacrolein conversion (X2) at the outlet of the reactor and methacrolein conversion (X1) at the outlet of the reactor at the time of the initiation of oxidation comes into the range of 2 to 30%, and continuing the oxidation while the mixed gas having a content of isobutylene of 500 volume ppm or less is supplied, after the difference (X1−X2) comes into the range of 2 to 30%.

Inventors:
Noriaki Suyasu
Hideshi Shiraishi
Application Number:
JP2012071298A
Publication Date:
March 23, 2016
Filing Date:
March 27, 2012
Export Citation:
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Assignee:
Sumitomo Chemical Co., Ltd.
International Classes:
C07C51/235; C07C57/055
Domestic Patent References:
JP55124734A
JP55100333A
JP2005272313A
JP52095609A
JP4090853A
Foreign References:
US4303550
Attorney, Agent or Firm:
Mitsuo Tanaka
Takuji Yamada
Kenichi Morizumi
Toru Nakayama
Toru Sakamoto



 
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