| 摘要 |
The treatment of natural gas under pressure from a production well, containing water in saturation, a major proportion of hydrocarbons, a substantial quantity of hydrogen sulfide and possibly carbon dioxide, consists of cooling the initial gas in predetermined thermodynamic conditions to avoid the formation of hydrates, recovering a liquid phase containing the bulk of the water and hydrogen sulfide, and a gas phase containing hydrocarbons and hydrogen sulfide. The treatment of natural gas under pressure from a production well, containing water in saturation, a major proportion of hydrocarbons, a substantial quantity of hydrogen sulfide and possibly carbon dioxide, consists of cooling the initial gas in predetermined thermodynamic conditions to avoid the formation of hydrates, recovering a liquid phase containing the bulk of the water and hydrogen sulfide, and a gas phase containing hydrocarbons and hydrogen sulfide. Part of the gas phase is placed in contact with recycled liquid condensate in a distillation column under predetermined thermodynamic conditions to avoid the formation of hydrates, recovering at the head of the column a va pour phase that is virtually free of water and contains a majority of hydrocarbons and a minority of hydrogen sulfide. A liquid phase containing a majority of hydrogen sulfide and a minority of hydrocarbons is recovered from the bottom of the column. The va pour phase is condensed by refrigeration and/or expansion, and the condensate is separated to yield a gas rich in hydrocarbons and lean in hydrogen sulfide and a liquid condensate rich in hydrogen sulfide that is recycled back to the distillation column.
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