Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD FOR PRODUCING ACRYLIC ACID
Document Type and Number:
Japanese Patent JP2001316326
Kind Code:
A
Abstract:

To provide a method for producing acrylic acid, by which the highly pure acrylic acid can profitably be produced from crude acrylic acid obtained by a catalytic gas phase oxidation method, while sufficiently removing impurities such as aldehydes, ketones and maleic acid compounds and simultaneously inhibiting the production of sludge.

This method for producing the acrylic acid, characterized by subjecting an acrylic acid-containing oxidation product solution obtained by a catalytic gas phase oxidation to an azeotropic dehydration treatment and then distilling the obtained crude acrylic acid in the coexistence with a hydrazine compound, while controlling the total concentration of maleic acid and maleic anhydride in the crude acrylic acid to ≤2,000 ppm.


Inventors:
NAKAGAWA TAKASHI
TASHIRO HIROMUNE
TOMITA KOJI
NAGAO IKUYA
Application Number:
JP2000134344A
Publication Date:
November 13, 2001
Filing Date:
May 08, 2000
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
IDEMITSU PETROCHEMICAL CO
International Classes:
C07C51/25; C07C51/44; C07C51/50; C07C57/05; C07C57/07; (IPC1-7): C07C51/44; C07C57/07
Domestic Patent References:
JPH09208515A1997-08-12
JPH07330659A1995-12-19
JPS5427520A1979-03-01
JPH05246941A1993-09-24
Attorney, Agent or Firm:
Kataoka Makoto



 
Previous Patent: METHOD FOR PRODUCING ALKALI METAL 2-NAPHTHYLPYRUVATE

Next Patent: METHOD FOR PRODUCING ESTER OLIGOMER, ESTER OLIGOMER, METHOD FOR PRODUCING POLYESTER AND METHOD FOR P...