| 摘要 |
1,248,708. Separating acetylene and ethylene. FARBWERKE HOECHST A.G. 31 Dec., 1969 [21 May, 1969], No. 63608/69. Heading C5E. Acetylene, and possibly ethylene, is separated from the gaseous effluent of a hydrocarbon pyrolysis process, which may also contain one or more of H 2 , CO, CO 2 , methane and ethylene, by the following process steps: (a) selective absorption of the acetylene in a high-boiling solvent therefor, e.g. dimethylformamide or N- methyl pyrrolidone; (b) treatment of the overhead gases to effect further separation of any desired components, e.g. ethylene; (c) multistage desorption of the gases dissolved in the solvent, including a first stage in which a stripping gas is used to desorb mainly gases other than acetylene, and a second stage in which acetylene is desorbed, e.g. by heat; and (d) regeneration of the solvent; a stripping gas being conducted in a cycle through the solvent regeneration stage (d), then the first desorption stage of step (c), then the absorption stage (a), and then viatheseparationinstallation of step (b) back to the solvent regeneration stage (d). The stripping gas is preferably composed of unwanted residual gases from separation step (b). |
