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    Process for producing isoprene
    5.
    发明公开
    Process for producing isoprene 失效
    一种生产异戊二烯的方法。

    公开(公告)号：EP0030109A1

    公开(公告)日：1981-06-10

    申请号：EP80304191.2

    申请日：1980-11-21

    申请人： KURARAY CO., LTD.

    发明人： Kyo, Sunao ,  Renge, Tumoru ,  Omura, Katsumi

    IPC分类号： C07C11/18 ,  C07C1/20 ,  B01J21/02 ,  B01J31/14

    CPC分类号： C07C1/20 ,  Y02P20/582 ,  C07C11/18

    摘要： A process for producing isoprene comprises decomposing a mixture containing at least two compounds of the formula
    wherein (i) W and Y each represent hydrogen, and X and Z are identical or different and each represent the group OR, (ii) Wand X together form a single bond, Y represents hydrogen and Z represents the group OR, (iii) W represents hydrogen, X and Ytogetherform a single bond, and Z representsthe group OR, or(iv) W represents hydrogen, X represents the group OR, and Y and Z together form a single bond, in which R represents hydrogen, methyl, methoxymethyl, methylbutenyl, methylbutenyloxymethyl, 1,1-dimethyl-3-hydroxypropyl, 1,1-dimethyl- 3-hydroxypropyloxymethyl, 3-methyl-3-hydroxy-butyl, 3-methyl- 3-hydroxybutyloxy- methyl, 1,1-dimethyl-3-methoxypropyl, 1,1-dimethyl-3-methoxypropyloxymethyl, 3-methyl-3-methoxybutyl or 3-methyl-3- methoxybutyloxy-methyl, at least one compound of the mixture being a compound of general formula (I) in which R is substituted-oxymethyl in the presence of water and an oxygen-containing boron compound selected from boron-oxyacids and boron compounds capable of generating the boron-oxyacids in situ under the reaction conditions, in the liquid phase at a temperature of at least 150°C while adjusting the ratio of the oxygen-containing boron compound to the entire water present in the reaction system such thatthe weight ratio or othoboric acid to water, calculated on the assumption that all the oxygen-containing boron compound changes in aqueous solution to orthoboric acid, is at least 15:85.