Title:
METHOD FOR PURIFYING (METH)ACRYLIC ACID
Document Type and Number:
WIPO Patent Application WO/2020/075762
Kind Code:
A1
Abstract:
In a method which separates solid and liquid from a slurry that comprises (meth)acrylic acid crude crystal and a mother liquor in a chamber, a crude crystal in which the amount of the mother liquor, specifically methanol as a solvent has been reduced, can be obtained by a solid-liquid separation method that separates the mother liquor from the slurry through a filter that is placed in the chamber while a gas is supplied into the chamber, and (meth)acrylic acid with less impurities can be obtained by purifying the crude crystal in which the mother liquor and the impurities have been reduced.
Inventors:
CHIZAKI YASUHIRO (JP)
KANAYA KOJI (JP)
HINO TOMOMICHI (JP)
RI MORIHIRO (JP)
ISHIBASHI RYUTARO (JP)
TAGUCHI YUKI (JP)
KANAYA KOJI (JP)
HINO TOMOMICHI (JP)
RI MORIHIRO (JP)
ISHIBASHI RYUTARO (JP)
TAGUCHI YUKI (JP)
Application Number:
PCT/JP2019/039840
Publication Date:
April 16, 2020
Filing Date:
October 09, 2019
Export Citation:
Assignee:
MITSUBISHI CHEM CORP (JP)
International Classes:
C07C51/47; B01D33/044; C02F11/123; C07C51/43; C07C57/07
Foreign References:
| JP2015040205A | 2015-03-02 | |||
| JPS4613914B1 | 1971-04-14 | |||
| JPS5259177A | 1977-05-16 |
Attorney, Agent or Firm:
MIYAZAKI Teruo et al. (JP)
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