| 摘要 |
<p>An improved process for separating a hydrocarbon bearing feed gas containing methane and lighter, C2 (ethylene & ethane) and heavier components into a fraction containing predominantly methane and lighter components and a fraction containing predominantly C2 and heavier hydrocarbon components including the steps of cooling and partially condensing and delivering the feed stream to a separator (44) to provide a first residue vapor and a C2-containing liquid, directing a portion of the C2-containing liquid into a heavy ends fractionation column (56) wherein the liquid is separated into a second hydrocarbon bearing vapor residue and a C2 containing product, conducting a portion of the first residue vapors with at least part of the partially condensed second residue into a light ends fractionating column (52) to thereby obtain third residue vapors and liquids, supplying the liquids recovered from the light ends fractionating column to the heavy ends fractionation column as the liquid feed thereto and directing part of the C2 containing liquid from the first step into intimate contact with the second residue, which liquid provides additional liquefied methane which acts with the partially condensed second residue as a direct contact refrigerant to thereby condense C2 and heavier components while the methane itself is evaporated in the light ends fractionation column.</p> |
