CROSSFLOW TYPE FILTERING OPERATION METHOD USING CERAMIC FILTER

Title:

CROSSFLOW TYPE FILTERING OPERATION METHOD USING CERAMIC FILTER

Document Type and Number:

WIPO Patent Application WO/2012/057155

Kind Code:

A1

Abstract:

Provided is a simple filtering operation method capable of carrying out a filtering operation with a ceramic filter over extended periods of time without clogging, in the operation of crossflow type filtering, using a ceramic filter, of terephthalic acid fine crystals in an oxidation reaction mother liquor during a process of terephthalic acid production. The present invention makes this possible by a fine crystal filtering operation and a backwash operation by a filtrate while maintaining a distribution circulation operation of the oxidation reaction mother liquor, under certain conditions.

Inventors:

ZAIMA FUMIYA (JP)
HOSHISHIMA NIROU (JP)
UOZUMI KAZUTOSHI (JP)
FUJITA HIDEAKI (JP)

Application Number:

PCT/JP2011/074572

Publication Date:

May 03, 2012

Filing Date:

October 25, 2011

Export Citation:

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Assignee:

MITSUBISHI GAS CHEMICAL CO (JP)
TOYO BOSEKI (JP)
MIZUSHIMA AROMA CO LTD (JP)
ZAIMA FUMIYA (JP)
HOSHISHIMA NIROU (JP)
UOZUMI KAZUTOSHI (JP)
FUJITA HIDEAKI (JP)

International Classes:

C07C51/43; B01D29/25; B01D29/37; B01D35/22; B01D37/04; B01D61/14; B01D61/22; B01D65/02; B01D65/06; B01D71/02; C07C63/26

Domestic Patent References:

WO2008072561A1	2008-06-19
WO2008075572A1	2008-06-26

Foreign References:

JP2003507160A	2003-02-25
JPS6351913A	1988-03-05
JPH03131312A	1991-06-04
JPH09239246A	1997-09-16
JP2000140842A	2000-05-23
JP2002263412A	2002-09-17
JPS53102290A	1978-09-06
JPH1015390A	1998-01-20
JP2002012573A	2002-01-15
JP2003507160A	2003-02-25
JPH03131312A	1991-06-04
JPH05317024A	1993-12-03
JPS6351913A	1988-03-05
JP2000140842A	2000-05-23

Other References: