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US 7,402,694 B2Granted
Process for removal of benzoic acid from an oxidizer purge stream
AssigneeEastman Chemical Company
InventorsRobert Lin, Philip Edward Gibson, Kenny Randolph Parker
Life of this patent
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Abstract
A process is disclosed that relates to the removal of impurities, specifically benzoic acid, from a mother liquor produced in the synthesis of carboxylic acid, typically terephthalic acid.
Claims42
A process to produce a benzoic acid rich stream, said process comprising
- (a) subjecting an oxidizer purge stream to evaporation in a main evaporator zone to produce a vapor stream and a super concentrated purge slurry;
- (b) filtering said super concentrated purge slurry in a solid-liquid separation zone to form a filter cake and a mother liquor wherein said solid-liquid separation zone comprises at least one device selected from the group consisting of pressure belt filters, filter presses, centrifuges, pressure leaf filters, and cross-flow filters;
- (c) washing said filter cake with a wash feed in said solid-liquid separation zone to form a washed cake and a wash filtrate;
- (d) subjecting said mother liquor to evaporation in an evaporator zone to form a solvent rich vapor;
- and
- (e) subjecting said solvent rich vapor to distillation in a separation zone to form a solvent rich stream and said benzoic acid rich stream.
3 more elements
A process to produce a benzoic acid rich stream, said process comprising
- (a) subjecting an oxidizer purge stream to evaporation in a first evaporator zone to produce a vapor stream and a concentrated purge slurry;
- (b) subjecting said concentrated purge slurry to evaporation in a second evaporator zone to form a solvent rich stream and a super concentrated purge slurry;
- (c) filtering said super concentrated purge slurry in a solid-liquid separation zone to form a filter cake and a mother liquor;
- (d) washing said filter cake with a wash feed in said solid-liquid separation zone to form a washed cake and a wash filtrate;
- wherein said solid-liquid separation zone comprises at least one device selected from the group consisting of pressure belt filters, filter presses, centrifuges, pressure leaf filters, and cross-flow filters;
- (e) subjecting said mother liquor to evaporation in a evaporator zone to form a solvent rich vapor;
- and
- (f) subjecting said solvent rich vapor to distillation in a separation zone to form a solvent rich stream and said benzoic acid rich stream.
5 more elements
Dependencies are inferred from the claim text.