Process for production of a carboxylic acid/diol mixture suitable for use in polyester production
First Claim
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1. A process for producing a carboxylic acid/diol mixture, said process comprising adding a diol to a water-wet carboxylic acid cake in a carboxylic acid/diol mixing zone to remove a portion of the water to form said carboxylic acid/diol mixture.
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Abstract
The present invention relates to a process by which a carboxylic acid/diol mixture is obtained from a carboxylic acid/solvent slurry without isolation of a substantially dry carboxylic acid solid. More specifically, the present invention relates to a process by which a terephthalic acid/ethylene glycol mixture is obtained from a terephthalic acid/solvent slurry without isolation of a substantially dry terephthalic acid solid.
71 Citations
35 Claims
- 1. A process for producing a carboxylic acid/diol mixture, said process comprising adding a diol to a water-wet carboxylic acid cake in a carboxylic acid/diol mixing zone to remove a portion of the water to form said carboxylic acid/diol mixture.
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5. A process for producing a carboxylic acid/diol mixture, said process comprising the following steps:
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(a) removing in a first solid-liquid separation device impurities from a carboxylic acid/solvent slurry to form a carboxylic acid cake with acetic acid and a solvent mother liquor stream; (b) removing a portion of a solvent in a second solid-liquid separation device from said carboxylic acid cake with solvent to form a water-wet carboxylic acid cake and a solvent/water byproduct liquor; and (c) adding a diol to said water-wet carboxylic acid cake in a carboxylic acid/diol mixing zone to remove a portion of the water to form said carboxylic acid/diol mixture. - View Dependent Claims (6, 7, 8)
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9. A process for producing a carboxylic acid/diol mixture, said process comprising:
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(a) removing a portion of solvent from a carboxylic acid/solvent slurry in a solid-liquid separation zone to form a water-wet carboxylic acid cake; (b) adding a diol to said water-wet carboxylic acid cake in a carboxylic acid/diol mixing zone to remove a portion of the water to form said carboxylic acid/diol mixture. - View Dependent Claims (10, 11, 12, 32)
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- 13. A process for producing a terephthalic acid/diol mixture, said process comprising adding a diol to a water-wet terephthalic acid cake in a terephthalic acid/diol mixing zone to remove a portion of the water to form said terephthalic acid/diol mixture.
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18. A process for producing a terephthalic acid/diol mixture, said process comprising the following steps:
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(a) removing in a first solid-liquid separation device impurities from a terephthalic acid/solvent slurry to form a terephthalic acid cake with acetic acid, (b) removing a portion of a solvent in a second solid-liquid separation device from said terephthalic acid cake with acetic acid to form a water-wet terephthalic acid cake; and (c) adding a diol to said water-wet terephthalic acid cake in a terephthalic acid/diol mixing zone to remove a portion of the water to form said terephthalic acid/diol mixture. - View Dependent Claims (19, 20, 21, 22, 23, 24, 33, 35)
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25. A process for producing a terephthalic acid/diol mixture, said process comprising:
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(a) removing a portion of solvent from a terephthalic acid/solvent slurry in a solid-liquid separation zone to form a water-wet terephthalic acid cake; and (b) adding a diol to said water-wet terephthalic acid cake in a terephthalic acid/diol mixing zone to remove a portion of the water to form said terephthalic acid/diol mixture. - View Dependent Claims (26, 27, 28, 29, 30, 34)
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31. A process for producing a terephthalic acid/diol mixture, said process comprising the following steps:
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(a) removing in a first solid-liquid separation device impurities from a terephthalic acid/solvent slurry to form a terephthalic acid cake with acetic acid;
wherein said first solid-liquid separation device is operated at a temperature between about 40°
C. to about 155°
C.;(b) removing a portion of a solvent in a second solid-liquid separation device to form said terephthalic acid cake with acetic acid to form a water-wet terephthalic acid cake;
wherein said second solid-liquid separation device is operated at a temperature between about 40°
C. to about 155°
C.; and(c) adding a diol to said water-wet terephthalic acid cake in a terephthalic acid/diol mixing zone to remove a portion of the water to form said terephthalic acid/diol mixture;
wherein said adding occurs at a temperature between about 40°
C. and 290°
C.;
wherein said diol is ethylene glycol.
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Specification