Preparation of cyclic .alpha.,.beta.-unsaturated ethers
    11.
    发明授权
    Preparation of cyclic .alpha.,.beta.-unsaturated ethers 失效
    环状α,β-不饱和醚的制备

    公开(公告)号:US4206126A

    公开(公告)日:1980-06-03

    申请号:US2335

    申请日:1979-01-10

    申请人: Walter Rebafka

    发明人: Walter Rebafka

    CPC分类号: C07D307/28 C07D309/18

    摘要: Cyclic .alpha.,.beta.-unsaturated ethers are prepared by isomerizing the corresponding .beta.,.gamma.-unsaturated ethers at from 50.degree. to 250.degree. C. in the presence of an iron carbonyl as the catalyst, and of a base.

    摘要翻译: 通过在羰基羰基作为催化剂和碱的存在下,在50℃至250℃异构化相应的β,γ-不饱和醚来制备环状α,β-不饱和醚。

    Recovery of isoprene from a C.sub.5 -hydrocarbon mixture
    12.
    发明授权
    Recovery of isoprene from a C.sub.5 -hydrocarbon mixture 失效
    从C5烃混合物中回收异戊二烯

    公开(公告)号:US4647344A

    公开(公告)日:1987-03-03

    申请号:US662602

    申请日:1984-10-19

    CPC分类号: C07C7/08 C07C7/10 Y10S203/20

    摘要: Isoprene is recovered from a C.sub.5 -hydrocarbon mixture containing isoprene, penta-1,3-diene and cyclopentadiene by separating the said mixture by liquid-liquid extraction or extractive distillation with the aid of a selective solvent, in combination with a distillation upstream or downstream from the liquid-liquid extraction or extractive distillation, by a method in which a stream containing penta-1,3-diene and cyclopentadiene is separated off in the upstream or downstream distillation and is catalytically hydrogenated, and the hydrogenated stream is fed to the upper part of the liquid-liquid extraction or extractive distillation.

    摘要翻译: 通过使用选择性溶剂的液 - 液萃取或萃取蒸馏分离所述混合物,与上游或下游的蒸馏相结合,从含有异戊二烯,五-1,3-二烯和环戊二烯的C5-烃混合物回收异戊二烯 从液 - 液萃取或萃取蒸馏中,通过在上游或下游蒸馏中分离出含有五-1,3-二烯和环戊二烯的物流并进行催化氢化的方法,并将氢化流进料至上层 液体萃取或萃取蒸馏的一部分。