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. 23, 2006
Filed:
Dec. 21, 2000
Yoshitake Ishii, Hineji, JP;
Kouji Ueno, Hineji, JP;
Kazuhiko Sakamoto, Hineji, JP;
Sei Nakahara, Hineji, JP;
Masatoshi Ueoka, Hineji, JP;
Tetsuji Mitsumoto, Hineji, JP;
Takeshi Nishimura, Hineji, JP;
Mamoru Takamura, Takasago, JP;
Hisao Nakama, Ibo-gun, JP;
Yoshitake Ishii, Hineji, JP;
Kouji Ueno, Hineji, JP;
Kazuhiko Sakamoto, Hineji, JP;
Sei Nakahara, Hineji, JP;
Masatoshi Ueoka, Hineji, JP;
Tetsuji Mitsumoto, Hineji, JP;
Takeshi Nishimura, Hineji, JP;
Mamoru Takamura, Takasago, JP;
Hisao Nakama, Ibo-gun, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
The present invention provides an industrially easy and economical method for purification of acrylic acid which enables to efficiently eliminate impurities from a crude acrylic acid containing aldehydes as the impurities while the formation of acrylic acid polymer is inhibited. The method for purification of acrylic acid includes the step of distilling a crude acrylic acid which is charged with an aldehyde treatment chemical, wherein the concentration ratio of furfural to acrolein by weight in the crude acrylic acid is adjusted so as to satisfy the following equation:(furfural concentration by weight)/(acrolein concentration by weight)≦100.