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    • 10. 发明专利
    • DE1194837B
    • 1965-06-16
    • DEK0047711
    • 1962-09-11
    • KUREHA CHEMICAL IND CO LTD
    • ITOH HIROJIWASHIMI KOICHIKOBAYASHI AKIO
    • C07C7/00C07C7/11C07C7/171
    • Acetylene-containing gases obtained from the pyrolysis of hydrocarbons are purified to remove C3 and higher unsaturated hydrocarbons by contact with an organic solvent immiscible and unreactive with sulphuric acid and the resultant solution of unsaturated hydrocarbons in the solvent is contacted with sulphuric acid to remove C3 and higher materials and the solvent recycled to the acetylene purification step. The pyrolysis gas is first washed with heavy oil and carbon dioxide may be removed with ethanolamine and water by freeze drying or by washing with methanol. The gas is countercurrently contacted with the solvent, preferably under normal conditions; suitable solvents are hexane, heptane, octane, nonane, decane, cyclohexane, decahydronaphthalene, petroleum naphtha freed of unsaturates, kerosene, nitromethane, nitroethane, nitropropane, ethylene dichloride, ethylidene dichloride, trichloroethane, carbon tetrachloride, dihexyl ether, dioctyl ether, and carbon disulphide. Thereafter the solvent is purified for reuse, without removing dissolved acetylene, by countercurrent contact with 40-95% sulphuric acid which may contain a dehydrating agent, e.g. sodium sulphate or phosphorus pentoxide, a reaction accelerator, e.g. aluminium sulphate or potassium bichromate, or a specific gravity increasing agent, e.g. sodium or potassium sulphate.