Title:
DEVICE AND METHOD FOR CRYSTALLIZING (METH)ACRYLIC ACID
Document Type and Number:
WIPO Patent Application WO/2011/001894
Kind Code:
A1
Abstract:
Provided are a crystallization device and crystallization method for obtaining higher purity (meth)acrylic acid while preventing potential obstruction of the crystallization tube such that there is no leakage of crude solution. The device for crystallizing (meth)acrylic acid comprises a feeding part for feeding crude (meth)acrylic acid solution; a crystallization tube; a tube for feeding heating medium; a tube for retaining heating medium; a reservoir part for retaining the crude (meth)acrylic acid solution that has passed through the crystallization tube; a circulating tube for circulating the crude (meth)acrylic acid solution from the reservoir part to the feeding part; and a pump for circulating the crude (meth)acrylic acid solution from the reservoir part to the feeding part. The circulating tube comprises a manometer. Batch-type dynamic crystallization is performed by allowing the crude (meth)acrylic acid to flow down in film form along the inside walls of the crystallization tube while being circulated.
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Inventors:
SAKAMOTO KAZUHIKO (JP)
UENO KOJI (JP)
ISHII YOSHITAKE (JP)
KITAURA MASATSUGU (JP)
UENO KOJI (JP)
ISHII YOSHITAKE (JP)
KITAURA MASATSUGU (JP)
Application Number:
PCT/JP2010/060755
Publication Date:
January 06, 2011
Filing Date:
June 24, 2010
Export Citation:
Assignee:
NIPPON CATALYTIC CHEM IND (JP)
SAKAMOTO KAZUHIKO (JP)
UENO KOJI (JP)
ISHII YOSHITAKE (JP)
KITAURA MASATSUGU (JP)
SAKAMOTO KAZUHIKO (JP)
UENO KOJI (JP)
ISHII YOSHITAKE (JP)
KITAURA MASATSUGU (JP)
International Classes:
C07C51/43; B01D9/02; C07C57/07
Foreign References:
| JPH0748311A | 1995-02-21 | |||
| JP2005336142A | 2005-12-08 | |||
| JP2005015478A | 2005-01-20 |
Other References:
See also references of EP 2450340A4
Attorney, Agent or Firm:
UEKI, Kyuichi et al. (JP)
Hisakazu Ueki (JP)
Hisakazu Ueki (JP)
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