| 摘要 |
<p>A process for the purification of a gas contains 1 - 5C and more hydrocarbons to eliminate volatile mercaptan compounds. A charge gas (1), pre-dried, and partially cooled is fed to an absorption column under pressure, which also receives a reflux liquid. The head product (6) is a purified gas with mercaptan content less than 30 ppm and the base product (13) supplies a fractionating column. From the head of the fractionating column (16) is obtained the most volatile compounds, free from mercaptans ; from the base is obtained a petrol fraction (29) containing mercaptans. The most volatile of these are eliminated from the head (32, 49) of at least one distillation column (31, 48), the final product (63) comprising a liquid petrol containing C5+ hydrocarbons, which is treated by sweetening to remove any volatile mercaptans. Part of the product is mixed with the most volatile compounds (16, 23) from the fractionator and recompressed. The mixture is cooled and returned as reflux to the absorption column. An Independent claim is also included for the installation to effect the process.</p> |
