Title:
PURIFICATION OF (METH)ACRYLIC ACID
Document Type and Number:
Japanese Patent JP3826435
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To distill and purify crude (meth)acrylic acid while excellently inhibiting polymerization by adding a specific polymerization inhibitor and using acetic acid as a by product and an inexpensive copper compound when the crude (meth)acrylic acid obtained by vapor-phase catalytic oxidation of propylene, etc., is distilled and purified.
SOLUTION: When crude (meth)acrylic acid containing water and acetic acid obtained by vapor-phase catalytic reaction of propylene or isobutene is distilled and purified, a mixture as a polymerization inhibitor of (A) an aqueous solution of acetic acid obtained by the distillation and purification process, (B) a copper compound which is copper carbonate or hydroxide and optionally (C) a polymerization inhibitor which is a phenol, an organometallic compound, an N-oxyl compound or an amine compound is added to the purification process.
Inventors:
Sanne Hokko
Shuhei Yada
Kiyoshi Takahashi
Toru Seki
Shuhei Yada
Kiyoshi Takahashi
Toru Seki
Application Number:
JP16587496A
Publication Date:
September 27, 2006
Filing Date:
June 26, 1996
Export Citation:
Assignee:
Mitsubishi Chemical Corporation
International Classes:
C07C51/50; C07C57/07; C07C57/05; C07C57/075; (IPC1-7): C07C57/07; C07C51/50; C07C57/05; C07C57/075
Domestic Patent References:
| JP8040974A | ||||
| JP6015496B2 | ||||
| JP47034687B1 | ||||
| JP51054515A | ||||
| JP4353503A | ||||
| JP51029432A | ||||
| JP8048650A | ||||
| JP50101313A | ||||
| JP6211735A |
Attorney, Agent or Firm:
Hasegawa Soji