Method for increasing the hydrogen sulphide concentration in an acid gas
First Claim
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1. A process for the removal of H2 S and CO2 from a gas stream comprising:
- (a) measuring the flow of the gas stream to produce a value representing the magnitude of the gas stream,(b) contacting said gas stream with a liquid regenerable absorbent in an absorber to absorb H2 S and CO2 from the gas stream and producing a loaded absorbent solution,(c) regenerating the loaded absorbent solution in a regenerator to produce an acid gas stream containing H2 S and CO2, and an absorbent solution,(d) comparing the value representing the magnitude of gas stream entering the absorber of step (a) with a predetermined value, and, if this value is smaller than a predetermined value, passing a portion of the acid gas stream to a second selective absorber, the second absorber being maintained under conditions to absorb H2 S and reject CO2 and the absorbent solution being a portion of that regenerated from the regenerator,(e) returning loaded absorbent solution from the second selective absorber to the regenerator, and(f) regenerating the loaded absorbent solutions from steps (c) and (e) to produce an acid gas having an increased H2 S concentration.
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Abstract
A method for increasing the hydrogen sulfide concentration in a gas stream, particularly a stream to be fed to a Claus unit, is disclosed. The method is characterized by the measurement of the flow of the gas stream to an absorption system, and in response to such measurement, separation of a portion of the acid gas leaving the regenerator of the system, and selective absorption of the H2 S in the portion, with passage of the loaded absorbent to the regenerator.
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Citations
14 Claims
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1. A process for the removal of H2 S and CO2 from a gas stream comprising:
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(a) measuring the flow of the gas stream to produce a value representing the magnitude of the gas stream, (b) contacting said gas stream with a liquid regenerable absorbent in an absorber to absorb H2 S and CO2 from the gas stream and producing a loaded absorbent solution, (c) regenerating the loaded absorbent solution in a regenerator to produce an acid gas stream containing H2 S and CO2, and an absorbent solution, (d) comparing the value representing the magnitude of gas stream entering the absorber of step (a) with a predetermined value, and, if this value is smaller than a predetermined value, passing a portion of the acid gas stream to a second selective absorber, the second absorber being maintained under conditions to absorb H2 S and reject CO2 and the absorbent solution being a portion of that regenerated from the regenerator, (e) returning loaded absorbent solution from the second selective absorber to the regenerator, and (f) regenerating the loaded absorbent solutions from steps (c) and (e) to produce an acid gas having an increased H2 S concentration. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A process for the removal of H2 S and CO2 from a gas stream comprising:
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(a) measuring the flow of the gas stream to produce a value a representing the magnitude of the gas stream, (b) contacting said gas stream with a liquid regenerable absorbent in an absorber to absorb H2 S and CO2 from the gas stream and producing a loaded absorbent solution, (c) regenerating the loaded absorbent solution in a regenerator to produce an acid gas stream containing H2 S and CO2, and an absorbent solution, (d) measuring the flow of the acid gas stream to produce a value b representing the magnitude of the acid gas stream or the H2 S concentration in the acid gas stream, (e) computing a value c from the formula c=-fa+kb wherein a and b are as above, and f and k represent constants, (f) comparing the value c with a predetermined value, and, if this value is smaller than a predetermined value, passing a portion of the acid gas stream to a second selective absorber, the second absorber being maintained under conditions to absorb H2 S and reject CO2 and the absorbent solution being a portion of that regenerated from the regenerator, (g) returning loaded absorbent solution from the second selective absorber to the regenerator, and (h) regenerating the loaded absorbent solutions from steps (c) and (g) to produce an acid gas having an increased H2 S concentration. - View Dependent Claims (8, 9, 10)
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11. A process for the removal of H2 S and CO2 from a gas stream comprising:
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(a) measuring the flow of the gas stream to produce a value a representing the magnitude of the gas stream, (b) contacting said gas stream with a liquid regenerable absorbent in an absorber to absorb H2 S and CO2 from the gas stream and producing a loaded absorbent solution, (c) regenerating the loaded absorbent solution in a regenerator to produce an acid gas stream containing H2 S and CO2, and an absorbent solution, (d) measuring the flow of the acid gas stream to produce a value b representing the magnitude of the acid gas stream or the H2 S concentration in the acid gas stream, (e) computing a value c from the formula c=-(m·
a/n·
b) wherein a and b are as above, and m and n represent constants,(f) comparing the value c with a predetermined value, and, if this value is smaller than a predetermined value, passing a portion of the acid gas stream to a second selective absorber, the second absorber being maintained under conditions to absorb H2 S and reject CO2 and the absorbent solution being a portion of that regenerated from the regenerator, (g) returning loaded absorbent solution from the second selective absorber to the regenerator, and (h) regenerating the loaded absorbent solutions from steps (c) and (g) to produce an acid gas having an increased H2 S concentration. - View Dependent Claims (12, 13, 14)
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Specification