The disclosure relates to a process for treating a gas mixture containing carbon dioxide and hydrogen sulphide, including the following steps: deacidificating the gas mixture by bringing the gas mixture into contact with a first lean absorbent solution stream, delivering a deacidified gas mixture, a
The disclosure relates to a process for treating a gas mixture containing carbon dioxide and hydrogen sulphide, including the following steps: deacidificating the gas mixture by bringing the gas mixture into contact with a first lean absorbent solution stream, delivering a deacidified gas mixture, and a first rich absorbent solution stream; regenerating the first rich absorbent solution stream, delivering the first lean absorbent solution stream and a sour gas stream; distillating the sour gas stream, delivering a first carbon-dioxide-rich stream and a hydrogen-sulphide-rich stream; purifying the first carbon-dioxide-rich stream by bringing the first carbon-dioxide-rich stream into contact with a second lean absorbent solution stream, delivering a second carbon-dioxide-rich stream and a second rich absorbent solution stream, the molar concentration of carbon dioxide in the second carbon-dioxide-rich stream being greater than the molar concentration of carbon dioxide in the first carbon-dioxide-rich stream. The disclosure also relates to an installation designed to implement this process.
대표청구항▼
1. A method for treating a gas mixture containing carbon dioxide and hydrogen sulfide, comprising the following steps: deacidifying the gas mixture by putting the gas mixture in contact with a first lean absorbent solution stream, delivering a deacidified gas mixture and a first rich absorbent solut
1. A method for treating a gas mixture containing carbon dioxide and hydrogen sulfide, comprising the following steps: deacidifying the gas mixture by putting the gas mixture in contact with a first lean absorbent solution stream, delivering a deacidified gas mixture and a first rich absorbent solution stream;regenerating the first rich absorbent solution, delivering the first lean absorbent solution stream and a stream of sour gases;distilling the stream of sour gases, delivering a first carbon-dioxide-rich stream and a rich-hydrogen-sulfide stream; andpurifying the first carbon-dioxide-rich stream by putting the first carbon-dioxide-rich stream in contact with a second lean absorbent solution stream, delivering a second carbon-dioxide-rich stream and a second rich absorbent solution stream, the molar concentration of carbon dioxide in the second carbon-dioxide-rich stream being greater than a molar concentration of carbon dioxide in the first carbon-dioxide-rich stream; andwherein the first lean absorbent solution stream and the second lean absorbent solution stream have the same composition. 2. The method according to claim 1, wherein: the regeneration step also comprises regenerating the second rich absorbent solution stream, the regeneration step delivering the first lean absorbent solution stream and the second lean absorbent solution stream; orthe deacidification step also comprises the putting of the gas mixture in contact with the second rich absorbent solution stream, delivering the deacidified gas mixture and the first rich absorbent solution stream. 3. The method according to claim 1, wherein the gas mixture containing carbon dioxide and hydrogen sulfide is based on hydrocarbons, and is natural gas. 4. The method according to claim 1, wherein the molar concentration ratio between carbon dioxide and hydrogen sulfide in the gas mixture comprising carbon dioxide and hydrogen sulfide is less than or equal to 1. 5. The method according to claim 1, wherein the molar concentration of carbon dioxide in the first carbon-dioxide-rich stream is comprised between 80 and 99%. 6. The method according to claim 1, wherein at least one of: the carbon dioxide concentration in the hydrogen-sulfide-rich stream is less than or equal to 5,000 ppmv; andthe hydrogen sulfide concentration in the second carbon-dioxide-rich stream is less than or equal to 5,000 ppmv. 7. The method according to claim 1, further comprising: dehydrating the deacidified gas mixture. 8. The method according to claim 1, not comprising any step for dehydrating the stream of sour gases by means of a molecular sieve or by contact with a solvent, prior to the distillation step. 9. An installation for treating a gas mixture containing sour gases, comprising: a conduit for supplying a gas mixture;a first conduit for supplying a lean absorbent solution;an absorption column, fed by the gas mixture supply conduit and by the first lean absorbent solution supply conduit;a conduit for drawing off a deacidified gas mixture stemming from the absorption column;a first conduit for drawing off a rich absorbent solution stemming from the absorption column;a regenerator, fed by the first conduit for drawing of a rich absorbent solution;a conduit for drawing off a lean absorbent solution stemming from the regenerator;a conduit for drawing off sour gases stemming from the regenerator;a distillation unit fed by the conduit for drawing off sour gases;a conduit for drawing off a hydrogen-sulfide-rich stream stemming from the distillation unit;a first conduit for drawing off a carbon-dioxide-rich stream stemming from the distillation unit;a second lean absorbent solution supply conduit;a contactor fed by the first conduit for drawing off a carbon-dioxide-rich stream and by the second lean absorbent solution supply conduit;a second conduit for drawing off a carbon-dioxide-rich stream stemming from the contactor; anda second conduit for drawing off a second rich absorbent solution stemming from the contactor; andwherein the first lean absorbent solution supply conduit and the second lean absorbent solution supply conduit stem from a same tank of lean absorbent solution. 10. The installation according to claim 9, wherein: the second conduit for drawing off a rich absorbent solution feeds the regenerator; orthe second conduit for drawing off a rich absorbent solution feeds the absorption column. 11. The installation according to claim 9, wherein the contactor is an absorption column or an injection mixer or a static mixer. 12. The installation according to claim 9, which is without any unit for dehydration by a solvent or by a molecular sieve between the regenerator and the distillation unit. 13. The method according to claim 1, applied in an installation comprising: a conduit for supplying a gas mixture; a first conduit for supplying a lean absorbent solution;an absorption column, fed by the gas mixture supply conduit and by the first lean absorbent solution supply conduit;a conduit for drawing off a deacidified gas mixture stemming from the absorption column;a first conduit for drawing off a rich absorbent solution stemming from the absorption column;a regenerator, fed by the first conduit for drawing off a rich absorbent solution;a conduit for drawing off a lean absorbent solution stemming from the regenerator;a conduit for drawing off sour gases stemming from the regenerator;a distillation unit fed by the conduit for drawing off sour gases;a conduit for drawing off a hydrogen-sulfide-rich stream stemming from the distillation unit;a first conduit for drawing off a carbon-dioxide-rich stream stemming from the distillation unit;a second lean absorbent solution supply conduit;a contactor fed by the first conduit for drawing off a carbon-dioxide-rich stream and by the second lean absorbent solution supply conduit;a second conduit for drawing off a carbon-dioxide-rich stream stemming from the contactor;a second conduit for drawing off a second rich absorbent solution stemming from the contactor; andwherein the first lean absorbent solution supply conduit and the second lean absorbent solution apply conduit stem from a same tank of lean absorbent solution. 14. A method for producing liquefied natural gas, comprising: (a) the treatment of natural gas containing sour gases comprising: deacidifying the gas mixture by putting the gas mixture in contact with a first lean absorbent solution stream, delivering a deacidified gas mixture and a first rich absorbent solution stream;regenerating the first rich absorbent solution, delivering the first lean absorbent solution stream and a stream of sour gases;distilling the stream of sour gases, delivering a first carbon-dioxide-rich stream and a rich-hydrogen-sulfide stream; andpurifying the first carbon-dioxide-rich stream by putting the first carbon-dioxide-rich stream in contact with a second lean absorbent solution stream, delivering a second carbon-dioxide-rich stream and a second rich absorbent solution stream, the molar concentration of carbon dioxide in the second carbon-dioxide-rich stream being greater than a molar concentration of carbon dioxide in the first carbon-dioxide-rich stream;wherein the first lean absorbent solution stream and the second lean absorbent solution stream have the same composition; and(b) liquefying the natural gas into liquefied natural gas. 15. The method according to claim 4, wherein the molar concentration ratio between carbon dioxide and hydrogen sulfide in the gas mixture comprising carbon dioxide and hydrogen sulfide is less than or equal to 0.75. 16. The method according to claim 15, wherein the molar concentration ratio between carbon dioxide and hydrogen sulfide in the gas mixture comprising carbon dioxide and hydrogen sulfide is less than or equal to 0.5. 17. The method according to claim 5, wherein the molar concentration of carbon dioxide in the first carbon-dioxide-rich stream is comprised between 85 and 98%. 18. The method according to claim 6, wherein: the carbon dioxide concentration in the hydrogen-sulfide-rich stream is less than or equal to 2,000 ppmv; andthe hydrogen sulfide concentration in the second carbon-dioxide-rich stream is less than or equal to 1,000 ppmv.
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이 특허에 인용된 특허 (7)
Ryan James M. (Weston MA) Holmes Arthur S. (Shrewsbury MA), Distillative separation of carbon dioxide from hydrogen sulfide.
Goddin ; Jr. Clifton S. (Tulsa OK) McGalliard Russell L. (Broken Arrow OK), Process for separating relatively pure fractions of methane and carbon dioxide from gas mixtures.
Ansquer Patrick (Lillebonne FRX) Orgebin Jean-Michel (Saint-Adresse FRX), Process for the fixed-bed sweetening of sour petroleum distillates with fraction temperatures of from about 125 to about.
Becker Hans (Munich DEX) Grimm Peter (Pullach DEX) Ranke Gerhard (Pcking DEX) Roth Dieter (Unterhaching DEX), Process for treating pressurized gases to remove unwanted components.
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