Generation of low-solids second mother liquor from terephthalic acid production filter
AssigneeEastman Chemical Company
InventorKENNY R. PARKER
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Abstract
Disclosed is a process for separating solids from liquid in a slurry. The process is characterized by using two filtration media. One filtration medium contains less than 10 mm in thickness of a filter cake containing the solids, and the other filtration medium contains at least 10 mm in thickness of a filter cake containing the solids. The second filtration medium has a higher separation efficiency that the first filtration medium. The process is particularly useful for separating terephthalic acid solids from an oxidation product slurry.
Claims20
A process for separating solids from liquid in a slurry, the process comprising:
- (a) contacting a first portion of a slurry comprising solids dispersed in a liquid with a first filtration medium to produce a first filtrate;
- (b) contacting a second portion of the slurry with a second filtration medium to produce a second filtrate;
- and
- (c) passing the first filtrate and the second filtrate to different locations;
- wherein the first filtration medium comprises less than 10 mm in thickness of a filter cake comprising the solids,
- wherein the second filtration medium comprises at least 10 mm in thickness of a filter cake comprising the solids, and
- wherein the second filtrate comprises a lower solids content than the first filtrate.
A method for generating a low solids content terephthalic acid oxidizer purge feed stream, the method comprising:
- (a) contacting a first portion of a slurry comprising terephthalic acid solids, acetic acid, and water from a process for making terephthalic acid with a first filtration medium to produce a first filtrate;
- (b) contacting a second portion of the slurry with a second filtration medium to produce a second filtrate;
- and
- (c) passing the first filtrate and the second filtrate to different locations in the process for making terephthalic acid;
- wherein the first filtration medium comprises a filter cloth and less than 10 mm in thickness of solids on the filter cloth;
- wherein the second filtration medium comprises a filter cloth and at least 10 mm in thickness of solids on the filter cloth;
- and
- wherein the second filtrate comprises a lower terephthalic acid solids content than the first filtrate.
Dependencies are inferred from the claim text.