Claims
- 1. A process for producing naphthalenedicarboxylic acid particles, which comprises the steps of:
- heating a liquid mixture of naphthalenedicarboxylic acid and/or an ester of naphthalenedicarboxylic acid, an alcohol and water to thereby prepare a water/alcohol solution of predetermined alcohol concentration in which naphthalenedicarboxylic acid and an ester of naphthalenedicarboxylic acid are dissolved, and
- lowering the alcohol concentration of the water/alcohol solution to thereby hydrolyze the ester of naphthalenedicarboxylic acid contained in the water/alcohol solution, so that naphthalenedicarboxylic acid particles are precipitated and separated.
- 2. The process as claimed in claim 1, wherein the liquid mixture of naphthalenedicarboxylic acid and/or an ester of naphthalenedicarboxylic acid, an alcohol and water contains the alcohol in a concentration ranging from 20 to 95% by weight based on the total of the alcohol and water.
- 3. The process as claimed in claim 1, wherein the alcohol concentration of the water/alcohol solution is lowered so as to range from 0 to 20% by weight based on the total of the alcohol and water.
- 4. The process as claimed in claim 2, wherein the alcohol concentration of the water/alcohol solution is lowered so as to range from 0 to 20% by weight based on the total of the alcohol and water.
- 5. The process as claimed in any one of claims 1 to 3 or 4, wherein the alcohol is methanol, ethanol or propanol.
- 6. The process according to any one of claims 1, 2, 3, or 5, wherein the EG slurry property value is no more than 2.5.
- 7. A process for producing naphthalenedicarboxylic acid particles, which comprises the steps of:
- heating a liquid mixture of naphthalenedicarboxylic acid and/or an ester of naphthalenedicarboxylic acid, an alcohol and water to thereby prepare a water/alcohol solution of predetermined alcohol concentration in which naphthalenedicarboxylic acid and the ester of naphthalenedicarboxylic acid are dissolved,
- lowering the alcohol concentration of the water/alcohol solution to thereby hydrolyze the ester of naphthalenedicarboxylic acid contained in the water/alcohol solution, so that naphthalenedicarboxylic acid particles are precipitated, and
- subjecting the precipitated naphthalenedicarboxylic acid particles to a solid-liquid separation at 100.degree. C. or higher.
- 8. Naphthalenedicarboxylic acid particles having an EG slurry property value of 2.7 or below, said EG slurry property value being defined as a molar ratio of ethylene glycol to naphthalenedicarboxylic acid (moles of ethylene glycol/moles of naphthalenedicarboxylic acid) of a slurry composed of a mixture of naphthalenedicarboxylic acid and ethylene glycol, said slurry having a viscosity of 1000 cP as measured by Brookfield viscometer.
- 9. Naphthalenedicarboxylic acid particles having an EG slurry property value of 2.7 or below, said EG slurry property value being defined as a molar ratio of ethylene glycol to naphthalenedicarboxylic acid (moles of ethylene glycol/moles of naphthalenedicarboxylic acid) of a slurry comprising a mixture of naphthalenedicarboxylic acid and ethylene glycol, said slurry having a viscosity of 1000 cP as measured by Brookfield viscometer,
- said naphthalenedicarboxylic acid particles comprising naphthalenedicarboxylic acid particles whose particle size is greater than 100 .mu.m but smaller than 212 .mu.m in a ratio of at least 50% by weight.
- 10. Naphthalenedicarboxylic acid particles having an EG slurry property value of 2.7 or below, said EG slurry property value being defined as a molar ratio of ethylene glycol to naphthalenedicarboxylic acid (moles of ethylene glycol/moles of naphthalenedicarboxylic acid) of a slurry comprising a mixture of naphthalenedicarboxylic acid and ethylene glycol, said slurry having a viscosity of 1000 cP as measured by Brookfield viscometer;
- said naphthalenedicarboxylic acid particles comprising naphthalenedicarboxylic acid particles whose particle size is greater than 100 .mu.m but smaller than 212 .mu.m in a ratio of at least 50% by weight and whose particle size is smaller than 38 .mu.m in a ratio of at least 20% by weight.
- 11. The naphthalenedicarboxylic acid particles according to claim 9 or claim 10, having an EG slurry property of no more than 2.5.
- 12. The naphthalene dicarboxylic acid particles according to claim 9, wherein from about 55 to 80 percent by weight of the particles have a particle size greater than 100 .mu.m but smaller than 212 .mu.m.
- 13. The naphthalene dicarboxylic acid particles according to claim 10, wherein from about 55 to 80 percent by weight of the particles have a particle size greater than 100 .mu.m but smaller than 212 .mu.m, and from 23 to 45 percent by weight of the particles have a particle size smaller than 38 .mu.m.
Priority Claims (2)
Number |
Date |
Country |
Kind |
8-124836 |
May 1996 |
JPX |
|
8-282191 |
Oct 1996 |
JPX |
|
CROSS-REFERENCE TO RELATED APPLICATION
This application is the National Phase entry, 35 USC 371, of International PCT application, PCT/JP97/01619, filed May 14, 1997, and designating the United States.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/JP97/01619 |
5/14/1997 |
|
|
6/23/1998 |
6/23/1998 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO97/44307 |
11/27/1997 |
|
|
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
5149867 |
Chen et al. |
Sep 1992 |
|
5292934 |
Sikkenga et al. |
Mar 1994 |
|
5872284 |
Iwasaki et al. |
Feb 1999 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
6505512 |
Jun 1994 |
JPX |
WO9312065 |
Jun 1993 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Database WPI, Section Ch, Week 7628, Derwent Publications Ltd., London, GB; Class A41, AN 76-53662X & SU 486 008 A (Monomers Res Inst), Jan. 15, 1976. |