Sour gas treatment process

摘要

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.

主权项

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; and purifying 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; and wherein the first lean absorbent solution stream and the second lean absorbent solution stream have the same composition.