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US 7,273,559 B2Granted
Process for removal of impurities from an oxidizer purge stream
AssigneeEastman Chemical Company
InventorsPhilip Edward Gibson, Kenny Randolph Parker, Howard Wood Jenkins, Jr.
Life of this patent
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Abstract
A process is disclosed that relates to the removal of impurities and the recovery of a mother liquor and wash filtrate from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves the removal of impurities and the recovery of a mother liquor and wash filtrate from an oxidizer purge stream and then routing the mother liquor and or wash filtrate to an oxidation zone.
Claims35
A process comprising:
- (a) routing an oxidizer purge stream to a solids enrichment zone to form a purge slurry comprising a metal catalyst, said oxidizer purge stream comprising a purge from an oxidizer mother liquor, said oxidizer mother liquor recycled to an oxidation zone, and obtained from a solid liquid separation zone;
- (b) subjecting said purge slurry to separation in a separation zone comprising a filtration zone and a washing zone, to produce a washed cake, mother liquor and a wash filtrate;
- wherein at least 80% of said metal catalyst from said purge slurry is recovered through said separation zone into said mother liquor and said wash filtrate cumulative;
- and
- (c) routing at least a portion of said metal catalyst recovered from said separation zone to said oxidation zone.
2 more elements
A process comprising:
- (a) adding a precipitant agent to an oxidizer purge stream in a solids enrichment zone to form a purge slurry comprising a metal catalyst, said oxidizer purge stream comprising a purge from an oxidizer mother liquor, said oxidizer mother liquor recycled to an oxidation zone, and obtained from a solid liquid separation zone;
- (b) subjecting said purge slurry to separation in a separation zone comprising a filtration zone and a washing zone, to produce a washed cake, mother liquor and a wash filtrate;
- wherein at least 80% of said metal catalyst from said purge slurry is recovered through said separation zone into said mother liquor and said wash filtrate cumulative;
- and
- (c) routing at least a portion of said metal catalyst recovered from said separation zone to said oxidation zone.
2 more elements
A process comprising:
- (a) cooling an oxidizer purge stream in a solids enrichment zone to form a purge slurry comprising a metal catalyst, said oxidizer purge stream comprising a purge from an oxidizer mother liquor, said oxidizer mother liquor recycled to an oxidation zone, and obtained from a solid liquid separation zone;
- (b) subjecting said purge slurry to separation in a separation zone comprising a filtration zone and a washing zone, to produce a washed cake, mother liquor and a wash filtrate;
- wherein at least 80% of said metal catalyst from said purge slurry is recovered through said separation zone into said mother liquor and said wash filtrate cumulative;
- and
- (c) routing at least a portion of said metal catalyst recovered from said separation zone to said oxidation zone.
2 more elements
Dependencies are inferred from the claim text.