会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 70. 发明专利
    • Method for separation of conjugated Diolefin
    • GB1161683A
    • 1969-08-20
    • GB4305066
    • 1966-09-27
    • JAPANESE GEON CO LTD
    • TAKAO SUSUMUHOKARI HIROSHI
    • C07C7/00C07C7/08C07C11/16C07C11/173
    • 1,161,683. Separating conjugated diolefins. JAPANESE GEON CO. Ltd. 27 Sept., 1966, No. 43050/66. Heading C5E. A process for the separation of a conjugated diolefin from C 4 or C 5 hydrocarbon mixture comprises introducing the hydrocarbon mixture to an intermediate portion of an extractive distillation zone through which a polar solvent is flowed downwardly, whereby a less readily soluble hydrocarbon fraction is formed as distillate at the top of the zone and a more readily soluble hydrocarbon fraction together with the solvent is recovered as liquid from the bottom of the zone; transferring the said liquid to a recovery zone operated at a lower pressure than the extractive distillation zone; returning an overhead vapour stream from the recovery zone to the extractive distillation zone; transfering liquid from the bottom of the recovery zone to a stripping zone; and recovering the more readily soluble hydrocarbon fraction as distillate from the top of the stripping zone while the solvent is withdrawn from the bottom of the stripping zone. The hydrocarbon mixture may contain hydrocarbons more readily soluble than the conjugated diolefin, hydrocarbons less readily soluble than the conjugated diolefin, or both. In the last case, a two-stage extractive distillation process may be used to recover the pure conjugated diolefin, a mixture of the conjugated diolefin and the more readily soluble hydrocarbons being obtained as the more readily soluble hydrocarbon fraction of the first stage, and this fraction being subjected to the process of the invention in a second stage to obtain the conjugated diolefin as the less readily soluble fraction. The polar solvent may be acetonitrile, furfural, N-methylpyrrolidone, butyrolactone, dimethyl formamide, acetone or a mixture thereof with water. The solvent may include polymerization inhibitors and/or chain-transfer agents such as furfural, aromatic nitro-compounds and benzaldehyde, and stabilizers such as sodium nitrite, methylene blue, sulphur, phenols or aromatic amines. The starting hydrocarbon mixture may be a C 4 or C5 fraction obtained by thermal cracking of petroleum, a C 4 fraction obtained by catalytic dehydrogenation of n-butane and/or n-butene or a C 5 fraction obtained by dehydrogenation of isopentane and/or isoamylene. Examples describe the separation of 1,3-butadiene from C 4 fractions containing paraffins, olefins and acetylenes. The process of the invention enables the bottom of the extractive distillation column to be at a relatively low temperature and thus decrease the tendency for the conjugated diolefin and/or higher acetylene to polymerize.