Process for production of a dried carboxylic acid cake suitable for use in polyester production
AssigneeEastman Chemical Company
InventorsKenny Randolph Parker, Robert Lin, Philip Edward Gibson
Life of this patent
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Abstract
The present invention relates to a process by which a dried carboxylic acid cake is obtained from a slurry or cake carboxylic acid product through the use of at least one counter current wash. More specifically, the present invention relates to a process by which a dried terephthalic acid cake suitable as a starting material for polyester or co-polyester production is obtained from a slurry or cake terephthalic acid product through the use of at least one counter current wash.
Claims22
A process for producing a dried carboxylic acid cake, said process comprising:
- (a) oxidizing in an oxidation zone an aromatic feedstock to produce a carboxylic acid slurry;
- (b) removing in a liquor exchange zone impurities from said carboxylic acid slurry to form a water-wet carboxylic acid cake, a mother liquor stream, a solvent mother liquor stream, and a solvent/water byproduct liquor stream;
- wherein at least one solvent is, added counter current to the flow of said carboxylic acid slurry;
- wherein said liquor exchange zone comprises one solid-liquid separation device capable of performing the removal of said impurities from said carboxylic acid slurry and producing said water-wet carboxylic acid cake from said carboxylic acid slurry;
- wherein said solvent comprises acetic acid, and
- (c) drying said water-wet carboxylic acid cake in a drying zone to form said dried carboxylic acid cake;
- wherein said water-wet cake maintains the form of a cake between step (b) and (c).
A process for producing a dried carboxylic acid cake, said process comprising:
- (a) oxidizing in an oxidation zone an aromatic feedstock to produce a carboxylic acid slurry;
- (b) removing in a solvent liquor exchange zone impurities from said carboxylic acid slurry to form a carboxylic acid cake with solvent, a mother liquor stream, and a solvent mother liquor stream;
- wherein said solvent comprises acetic acid;
- (c) adding water in a counter current water wash zone to said carboxylic cake with solvent to produce a water-wet carboxylic acid cake and a solvent/water byproduct liquor stream;
- and
- (d) drying said water-wet carboxylic acid cake in a drying zone to form said dried carboxylic acid cake wherein said water-wet cake maintains the form of a cake between step (c) and (d).
A process for producing a dried carboxylic acid cake, said process comprising the following steps in the order named:
- (a) oxidizing in an oxidation zone an aromatic feedstock to produce a carboxylic acid slurry;
- (b) removing in a solid-liquid separation zone impurities from said carboxylic acid slurry to form a slurry or cake product and a mother liquor stream;
- (c) removing in a counter current solvent-water liquor exchange zone impurities from said slurry or cake product to form a water-wet carboxylic acid cake, a solvent mother liquor stream, and a solvent/water byproduct liquor stream;
- wherein said counter current solvent-water liquor exchange zone comprises one solid-liquid separation device;
- wherein said solvent comprises acetic acid;
- and
- (d) drying said water-wet carboxylic acid cake in a drying zone to form said dried carboxylic acid cake wherein said water-wet cake maintains the form of a cake between step (c) and (d).
A process for producing a dried carboxylic acid cake, said process comprising the following steps in the order named:
- (a) removing a solvent from a slurry or cake product in a counter current solvent-water liquor exchange zone;
- wherein a portion of the solvent in said slurry or cake product is replaced with water to form a water-wet carboxylic acid cake;
- wherein said counter current solvent-water liquor exchange zone comprises one solid-liquid separation device;
- wherein said solvent comprises acetic acid;
- and
- (b) drying said water-wet carboxylic acid cake in a drying zone to form said dried carboxylic acid cake wherein said water-wet cake maintains the form of a cake between step (a) and (b).
Dependencies are inferred from the claim text.