Process for production of a carboxylic acid/diol mixture suitable for use in polyester production
First Claim
1. A process for producing a carboxylic acid/diol mixture suitable for the production of polyesters, said process comprising adding a diol to a water-wet carboxylic acid cake in a carboxylic acid/diol mixing zone to remove at least a portion of the water from said water-wet carboxylic acid cake to form said carboxylic acid/diol mixture;
- wherein said carboxylic acid/diol mixture is produced without the isolation of a substantially dry carboxylic acid solid;
wherein said water is displaced from said water-wet carboxylic acid cake by the addition of said diol.
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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.
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Citations
30 Claims
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1. A process for producing a carboxylic acid/diol mixture suitable for the production of polyesters, said process comprising adding a diol to a water-wet carboxylic acid cake in a carboxylic acid/diol mixing zone to remove at least a portion of the water from said water-wet carboxylic acid cake to form said carboxylic acid/diol mixture;
- wherein said carboxylic acid/diol mixture is produced without the isolation of a substantially dry carboxylic acid solid;
wherein said water is displaced from said water-wet carboxylic acid cake by the addition of said diol. - View Dependent Claims (2, 3, 4)
- wherein said carboxylic acid/diol mixture is produced without the isolation of a substantially dry carboxylic acid solid;
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5. A process for producing a carboxylic acid/diol mixture suitable for the production of polyesters, 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 acetic acid to form a water-wet carboxylic acid cake and a solvent/water byproduct liquor; (c) adding a diol to said water-wet carboxylic acid cake in a carboxylic acid/diol mixing zone to remove at least a portion of the water from said water-wet carboxylic acid cake to form said carboxylic acid/diol mixture;
wherein said carboxylic acid/diol mixture is produced without the isolation of a substantially dry carboxylic acid solid;
wherein said water is displaced from said water-wet carboxylic acid cake by the addition of said diol. - View Dependent Claims (6, 7, 8)
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9. A process for producing a carboxylic acid/diol mixture suitable for the production of polyesters, said process comprising the following steps:
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(a) removing a solvent from a carboxylic acid/solvent slurry in a solid-liquid separation zone;
wherein a portion of the solvent in said carboxylic acid/solvent slurry is replaced with water 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 at least a portion of the water from said water-wet carboxylic acid cake to form said carboxylic acid/diol mixture;
wherein said carboxylic acid/diol mixture is produced without the isolation of a substantially dry carboxylic acid solid;
wherein said water is displaced from said water-wet carboxylic acid cake by the addition of said diol. - View Dependent Claims (10, 11, 12)
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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 suitable for the production of polyesters, 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 at least a portion of the water from said water-wet carboxylic acid cake to form said terephthalic acid/diol mixture;
wherein said carboxylic acid/diol mixture is produced without the isolation of a substantially dry carboxylic acid solid;
wherein said water is displaced from said water-wet carboxylic acid cake by the addition of said diol. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A process for producing a terephthalic acid/diol mixture suitable for the production of polyesters, said process comprising the following steps:
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(a) removing a solvent from a terephthalic acid/solvent slurry in a solid-liquid separation zone;
wherein a portion of the solvent in said terephthalic acid/solvent slurry is replaced with water to form a water-wet terephthalic acid cake;(b) adding a diol to said water-wet terephthalic acid cake in a terephthalic acid/diol mixing zone to remove at a portion the water from said water-wet carboxylic acid cake to form said terephthalic acid/diol mixture;
wherein said carboxylic acid/diol mixture is produced without the isolation of a substantially dry carboxylic acid solid;
wherein said water is displaced from said water-wet carboxylic acid cake by the addition of said diol. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification