Method and system for regenerating an amine-containing scrubbing solution obtained during gas purification
First Claim
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1. A method of regenerating an amine-containing scrubbing solution obtained during gas purification and having CO2 and sulfur compounds chemically bound therein, the method which comprises:
- a) heating a contaminated scrubbing solution to a temperature of at least 110°
C. and compressing to a pressure of at least 4 bar, subsequently expanding the scrubbing solution in a first expansion stage, and removing a major proportion of CO2 and sulfur compounds from the scrubbing solution as a gas stream to form a partially regenerated scrubbing solution;
b) heating the partially regenerated scrubbing solution obtained in step a) to a temperature of at least 130°
C. and compressing to a pressure of at least 4 bar, and expanding the partially regenerated scrubbing solution in a second expansion stage to a pressure that is at least 0.5 bar higher than an expansion pressure of the first expansion stage, and removing a major proportion of the CO2 and sulfur compounds still present from the partially regenerated scrubbing solution as a gas stream;
c) cooling the scrubbing solution removed in the second expansion stage to a temperature below 70°
C. and expanding to standard pressure in a third expansion stage, and removing residual amounts of soluble CO2 still present, and cooling to standard temperature as a completely purified scrubbing solution;
d) removing condensed water from the gas mixture (vapors) cooled to standard temperature, and mixing the condensed water at a dosed amount with the completely purified scrubbing solution; and
e) dividing the scrubbing solution removed after the first expansion stage or the second expansion stage into first and second partial streams, and returning the first partial stream in the circuit to the respective expansion stage and adjusting a temperature and a pressure thereof to conditions of the associated expansion stage, wherein residual amounts of sulfur compounds still present are removed from the first partial stream during the expansion and the second partial stream is further processed in accordance with step b) or step c).
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Abstract
A method for regenerating an amine-containing scrubbing solution which is obtained during gas purification and in which CO2 and sulfur compounds are chemically bonded, as well as a system that is suitable for carrying out the method. The contaminated scrubbing solution is heated, compressed, and expanded in several stages such that CO2 and sulfur compounds are separated. The expanded scrubbing solution is subdivided into two partial streams, and one partial stream is recirculated into the process.
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Citations
9 Claims
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1. A method of regenerating an amine-containing scrubbing solution obtained during gas purification and having CO2 and sulfur compounds chemically bound therein, the method which comprises:
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a) heating a contaminated scrubbing solution to a temperature of at least 110°
C. and compressing to a pressure of at least 4 bar, subsequently expanding the scrubbing solution in a first expansion stage, and removing a major proportion of CO2 and sulfur compounds from the scrubbing solution as a gas stream to form a partially regenerated scrubbing solution;b) heating the partially regenerated scrubbing solution obtained in step a) to a temperature of at least 130°
C. and compressing to a pressure of at least 4 bar, and expanding the partially regenerated scrubbing solution in a second expansion stage to a pressure that is at least 0.5 bar higher than an expansion pressure of the first expansion stage, and removing a major proportion of the CO2 and sulfur compounds still present from the partially regenerated scrubbing solution as a gas stream;c) cooling the scrubbing solution removed in the second expansion stage to a temperature below 70°
C. and expanding to standard pressure in a third expansion stage, and removing residual amounts of soluble CO2 still present, and cooling to standard temperature as a completely purified scrubbing solution;d) removing condensed water from the gas mixture (vapors) cooled to standard temperature, and mixing the condensed water at a dosed amount with the completely purified scrubbing solution; and e) dividing the scrubbing solution removed after the first expansion stage or the second expansion stage into first and second partial streams, and returning the first partial stream in the circuit to the respective expansion stage and adjusting a temperature and a pressure thereof to conditions of the associated expansion stage, wherein residual amounts of sulfur compounds still present are removed from the first partial stream during the expansion and the second partial stream is further processed in accordance with step b) or step c). - View Dependent Claims (2, 3, 4, 5, 6, 9)
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7. A method of regenerating an amine-containing scrubbing solution obtained during gas purification and having CO2 and sulfur compounds chemically bound therein, the method which comprises:
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a) heating a contaminated scrubbing solution to a temperature of at least 110°
C. and compressing to a pressure of at least 4 bar, subsequently expanding the scrubbing solution in a first expansion stage, and removing a major proportion of CO2 and sulfur compounds from the scrubbing solution as a gas stream to form a partially regenerated scrubbing solution;b) heating the partially regenerated scrubbing solution obtained in step a) to a temperature of at least 130°
C. and compressing to a pressure of at least 4 bar, and expanding the partially regenerated scrubbing solution in a second expansion stage to a pressure that is at least 0.5 bar higher than an expansion pressure of the first expansion stage, and removing a major proportion of the CO2 and sulfur compounds still present from the partially regenerated scrubbing solution as a gas stream;c) cooling the scrubbing solution removed in the second expansion stage to a temperature below 70°
C. and expanding to standard pressure in a third expansion stage, and removing residual amounts of soluble CO2 still present, and cooling to standard temperature as a completely purified scrubbing solution; andd) dividing the scrubbing solution removed after the first expansion stage or the second expansion stage into first and second partial streams, and returning the first partial stream in the circuit to the respective expansion stage and adjusting a temperature and a pressure thereof to conditions of the associated expansion stage, wherein residual amounts of sulfur compounds still present are removed from the first partial stream during the expansion and the second partial stream is further processed in accordance with step b) or step c); and subjecting the scrubbing solution to ultrasonic treatment during the first expansion stage.
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8. A method of regenerating an amine-containing scrubbing solution obtained during gas purification and having CO2 and sulfur compounds chemically bound therein, the method which comprises:
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a) heating a contaminated scrubbing solution to a temperature of at least 110°
C. and compressing to a pressure of at least 4 bar, subsequently expanding the scrubbing solution in a first expansion stage, and removing a major proportion of CO2 and sulfur compounds from the scrubbing solution as a gas stream to form a partially regenerated scrubbing solution;b) heating the partially regenerated scrubbing solution obtained in step a) to a temperature of at least 130°
C. and compressing to a pressure of at least 4 bar, and expanding the partially regenerated scrubbing solution in a second expansion stage to a pressure that is at least 0.5 bar higher than an expansion pressure of the first expansion stage, and removing a major proportion of the CO2 and sulfur compounds still present from the partially regenerated scrubbing solution as a gas stream;c) cooling the scrubbing solution removed in the second expansion stage to a temperature below 70°
C. and expanding to standard pressure in a third expansion stage and removing residual amounts of soluble CO2 still present, and cooling to standard temperature as a completely purified scrubbing solution; andd) dividing the scrubbing solution removed after the first expansion stage or the second expansion stage into first and second partial streams, and returning the first partial stream in the circuit to the respective expansion stage and adjusting a temperature and a pressure thereof to conditions of the associated expansion stage, wherein residual amounts of sulfur compounds still present are removed from the first partial stream during the expansion and the second partial stream is further processed in accordance with step b) or step c); and measuring a pH of the purified scrubbing solution and utilizing the measured pH as a control variable for adjusting a temperature of the contaminated scrubbing solution in the expansion stages.
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Specification