JPS5533421A - Method of centrifuging slurry containing crystals of terephthalic acid - Google Patents
Method of centrifuging slurry containing crystals of terephthalic acidInfo
- Publication number
- JPS5533421A JPS5533421A JP10574078A JP10574078A JPS5533421A JP S5533421 A JPS5533421 A JP S5533421A JP 10574078 A JP10574078 A JP 10574078A JP 10574078 A JP10574078 A JP 10574078A JP S5533421 A JPS5533421 A JP S5533421A
- Authority
- JP
- Japan
- Prior art keywords
- terephthalic acid
- cake
- filter
- thickness
- good
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
PURPOSE: Slurries of terephthalic acid are separated into solid and liquid components using batchwise centrfuge and the cake on the filter is scratched off and the scratching is repeated so that the remaining thickness becomes gradually thinner, thus producing terephthalic of low metal content.
CONSTITUTION: The slurries containing terephthalic acid crystals resulting from the oxidation of p-xylene in an acetic acid solvent in the presence of a heavy metal is subjected to centrifugation with a batchwise centrifuge to separate terephthalic acid. The operation of scraping off the cake of terephthalic acid on the filter is repeated and at this time the thickness of cake remining on the filter is made gradually thin, whereby the filtration is kept good. When the heal is made thin at the beginning, the thickness becomes too early thin, though filtability is good, and resultingly the number of cycle becomes few. The adequated thickness of the heal is 18W25 mm. If the cake is washed with acetic acid before scraped, the good filtration operation can be effectively kept.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10574078A JPS5533421A (en) | 1978-08-29 | 1978-08-29 | Method of centrifuging slurry containing crystals of terephthalic acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10574078A JPS5533421A (en) | 1978-08-29 | 1978-08-29 | Method of centrifuging slurry containing crystals of terephthalic acid |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5533421A true JPS5533421A (en) | 1980-03-08 |
JPS6133015B2 JPS6133015B2 (en) | 1986-07-31 |
Family
ID=14415658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10574078A Granted JPS5533421A (en) | 1978-08-29 | 1978-08-29 | Method of centrifuging slurry containing crystals of terephthalic acid |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5533421A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7193109B2 (en) | 2003-03-06 | 2007-03-20 | Eastman Chemical Company | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
US7214760B2 (en) | 2004-01-15 | 2007-05-08 | Eastman Chemical Company | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
US7276625B2 (en) | 2002-10-15 | 2007-10-02 | Eastman Chemical Company | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
-
1978
- 1978-08-29 JP JP10574078A patent/JPS5533421A/en active Granted
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7276625B2 (en) | 2002-10-15 | 2007-10-02 | Eastman Chemical Company | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
US7339072B2 (en) | 2002-10-15 | 2008-03-04 | Eastman Chemical Company | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
US7193109B2 (en) | 2003-03-06 | 2007-03-20 | Eastman Chemical Company | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
US7226986B2 (en) | 2003-03-06 | 2007-06-05 | Eastman Chemical Company | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
US7214760B2 (en) | 2004-01-15 | 2007-05-08 | Eastman Chemical Company | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
US7601795B2 (en) | 2004-01-15 | 2009-10-13 | Eastman Chemical Company | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
Also Published As
Publication number | Publication date |
---|---|
JPS6133015B2 (en) | 1986-07-31 |
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