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US 12,577,193 B2Granted
Process for recovering oxidation by-products
AssigneeIneos US Chemicals Company
InventorsAnders Bitsch-Larsen, Gang Jia
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Abstract
A process for recovering by-products of a substituted aromatic hydrocarbon oxidation reaction, comprising cooling one or more of a vapor stream directed to a high-pressure absorber (380), a solvent-rich scrubbing stream (381) directed to a high-pressure absorber (380), and a water-rich liquid stream (383) directed to a solvent recovery zone, by heat exchange with a cooled spent scrubbing liquid withdrawn from a low-pressure scrubber (430).
Claims20
A process for recovering by-products of a substituted aromatic hydrocarbon oxidation reaction, comprising
- in a low-pressure scrubber, operating at a pressure in the range of 0-0.5 barg, contacting a first water-rich scrubbing stream with a first vapor stream comprising bromine to form a cooled spent stream and a first scrubbed vapor stream, the first scrubbed vapor stream comprising a reduced amount of bromine relative to the first vapor stream, wherein a temperature of the cooled spent stream is at least 2° C. lower than a temperature of the first water-rich scrubbing stream;
- the process further comprising one or both of
- a) in a high-pressure absorber, contacting a second vapor stream comprising one or more by-products of the substituted aromatic hydrocarbon oxidation reaction with a second solvent-rich scrubbing stream to form a second scrubbed vapor stream, the second scrubbed vapor stream comprising a reduced amount of one or more by-products relative to the second vapor stream,
- wherein, before introduction to the high-pressure absorber, at least one of the second vapor stream and the second solvent-rich scrubbing stream is cooled by heat-exchange with at least a portion of the cooled spent stream;
- and
- b) in a solvent recovery zone, separating at least a portion of a water-rich liquid stream comprising one or more by-products of the substituted aromatic hydrocarbon oxidation reaction by reverse osmosis to form a by-product stream and a purified stream, the purified stream comprising a reduced amount of the one or more by-products relative to the water-rich liquid stream,
- wherein, before introduction to the recovery zone, the water-rich liquid stream is cooled by heat-exchange with at least a portion of the cooled spent stream.
4 more elements
A system for recovering by-products of a substituted aromatic hydrocarbon oxidation reaction, comprising
- a low-pressure scrubber, operating at a pressure in the range of 0-0.5 barg and capable of contacting a first water-rich scrubbing stream with a first vapor stream comprising bromine to form a cooled spent stream and a first scrubbed vapor stream, the first scrubbed vapor stream comprising a reduced amount of bromine relative to the first vapor stream, wherein a temperature of the cooled spent stream is at least 2° C. lower than a temperature of the first water-rich scrubbing stream;
- the system further comprising one or both of
- a) a high-pressure absorber capable of contacting a second vapor stream comprising one or more by-products of the substituted aromatic hydrocarbon oxidation reaction with a second solvent-rich scrubbing stream to form a second scrubbed vapor stream, the second scrubbed vapor stream comprising a reduced amount of one or more by-products relative to the second vapor stream, and
- at least one of
- a heat exchanger capable of cooling the second vapor stream before introduction to the high-pressure absorber, by heat exchange with at least a portion of the cooled spent stream;
- and
- a heat exchanger capable of cooling the second solvent-rich scrubbing stream before introduction to the high-pressure absorber, by heat exchange with at least a portion of the cooled spent stream;
- and
- b) a reverse osmosis unit capable of separating at least a portion of a water-rich liquid stream comprising one or more by-products of the substituted aromatic hydrocarbon oxidation reaction by reverse osmosis to form a by-product stream and a purified stream, the purified stream comprising a reduced amount of the one or more by-products relative to the water-rich liquid stream, and
- a heat exchanger capable of cooling the water-rich liquid stream before introduction to the recovery zone, by heat exchange with at least a portion of the cooled spent stream.
7 more elements
Dependencies are inferred from the claim text.