METHOD OF CRYSTALLIZATION - MITSUBISHI GAS CHEMICAL CO

Title:

METHOD OF CRYSTALLIZATION

Document Type and Number:

WIPO Patent Application WO/2002/028499

Kind Code:

A1

Abstract:

A method of crystallization which comprises feeding to a crystallization vessel either a solution of terephthalic acid or a slurry solution in which part of terephthalic acid has been precipitated, crystallizing the terephthalic acid in the vessel to obtain a slurry comprising crystals and the solvent, and discharging the slurry, wherein the slurry discharged from the crystallization vessel is introduced into a liquid cyclone through a tangential-direction inlet, and the slurry component constituting a descending turning flow and flowing out through the lower outlet of the cyclone is returned to the crystallization vessel, while the slurry component overflowing through the upper outlet of the cyclone is discharged. Thus, crystals having a large particle diameter can be obtained. Furthermore, no crystal deposition or accumulation within the crystallization vessel occurs, and the crystallization operation can be stably conducted for long.

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Inventors:

OHKOSHI FUMIO (JP)
FURUYA TAKAHISA (JP)

Application Number:

PCT/JP2001/008237

Publication Date:

April 11, 2002

Filing Date:

September 21, 2001

Export Citation:

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Assignee:

MITSUBISHI GAS CHEMICAL CO (JP)
TOYO BOSEKI (JP)
MIZUSHIMA AROMA CO LTD (JP)
OHKOSHI FUMIO (JP)
FURUYA TAKAHISA (JP)

International Classes:

B01D9/00; C07C51/265; C07C51/43; (IPC1-7): B01D9/02; C07C51/43; C07C51/265; C07C63/26

Domestic Patent References:

WO1998038150A1

1998-09-03

Foreign References:

JPH11335321A	1999-12-07
US5705682A	1998-01-06
JPH08208561A	1996-08-13
US5973196A	1999-10-26

Other References: