Power recovery for use in start-up or re-start of a pure terephthalic acid production process
OwnerHarald B. CARRICK, Graham AIRD +1inventors
InventorsHarald B. CARRICK, Graham AIRD, Graeme HUMPHRIES
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Abstract
The invention relates to a method and system for recovering power from the gaseous stream produced by a paraxylene-air oxidation reaction. Specifically, the invention is based on heating the gaseous stream from the oxidation reaction to a temperature of at least 600° C., recovering energy through an expander, heating the expander vent stream and recovering heat from the vent stream. The recovered heat is used to maintain the oxidation process, purification process, start-up the process, or re-start the process after an interruption.
Claims41
A process for generating and recovering power from a paraxylene-air oxidation reaction to produce terephthalic acid utilising an internal combustion open cycle gas turbine (ICOCGT) which includes a compressor, combustor and expander, wherein the oxidation reaction produces a gaseous stream. comprising:
- a. heating the gaseous stream to a temperature of at least 600° C.;
- b. sending the gaseous stream to an ICOCGT expander that drives an ICOCGT compressor, wherein the compressor compresses air fed to the oxidation reactor and the expander emits a gaseous vent stream;
- c. feeding the gaseous vent stream to a heat recovery system to produce recovered heat;
- and
- d. generating high grade heat from the recovered heat.
A paraxylene-air oxidation reaction to produce terephthalic acid system, utilising an internal combustion open cycle gas turbine (ICOCGT) which includes a compressor, combustor and expander, comprising:
- a. an oxidation reactor comprising an oxidant inlet and a gaseous stream outlet, wherein said reactor emits a gaseous stream from said gaseous stream outlet;
- b. a power recovery system connected to the gaseous stream outlet comprising:
- (i) a heater for receiving and heating the gaseous stream connected downstream of the gaseous stream outlet;
- and (ii) an ICOCGT expander positioned downstream of the heater that drives an ICOCGT compressor, wherein the compressor produces a compressed air stream and the expander emits a gaseous vent stream;
- and
- c. a heat recovery system for receiving the gaseous vent stream and producing a high grade heat stream.
A process, utilising an internal combustion open cycle gas turbine (ICOCGT) which includes a compressor, combustor and expander, for maintaining the operation of a terephthalic acid oxidation plant following an oxidation reactor trip comprising:
- a. retaining a concentration of oxygen in an ICOCGT combustor sufficient to sustain combustion and generate a combusted gas stream;
- b. feeding the combusted gas stream to an ICOCGT expander, which produces a vent gas stream;
- c. feeding the vent gas stream to a heat recovery system, with an optional auxiliary combustor, to produce recovered heat;
- and
- d. using the recovered heat to maintain the operation of the terephthalic acid oxidation plant process duties.
Dependencies are inferred from the claim text.