PART-STREAM DISTILLATION
    7.
    发明申请

    公开(公告)号:US20160115140A1

    公开(公告)日:2016-04-28

    申请号:US14787956

    申请日:2014-04-28

    摘要: A continuous process for the preparation of propylene oxide, comprising (a) reacting propene, optionally admixed with propane, with hydrogen peroxide in a reaction apparatus in the presence of acetonitrile as solvent, obtaining a stream S0 containing propylene oxide, acetonitrile, water, at least one further component B, optionally propene and optionally propane, wherein the normal boiling point of the at least one component B is higher than the normal boiling point of acetonitrile and wherein the decadic logarithm of the octanol-water partition coefficient (log Kow) of the at least one component B is greater than zero; (b) separating propylene oxide from S0, obtaining a stream S1 containing acetonitrile, water and the at least one further component B; (c) dividing S1 into two streams S2 and S3; (d) subjecting S3 to a vapor-liquid fractionation in a fractionation unit, obtaining a vapor fraction stream S4 being depleted of the at least one component B; (e) recycling at least a portion of S4, optionally after work-up, to (a).

    摘要翻译: 一种用于制备环氧丙烷的连续方法,包括(a)在乙腈作为溶剂的存在下,在反应装置中将丙烯任选与丙烷混合,与过氧化氢反应,得到含有环氧丙烷,乙腈,水的流S0 至少一种另外的组分B,任选的丙烯和任选的丙烷,其中至少一种组分B的标准沸点高于乙腈的标准沸点,其中辛醇 - 水分配系数(log Kow)的十进制对数 所述至少一个组分B大于零; (b)从S0分离环氧丙烷,得到含有乙腈,水和至少一种其它组分B的料流S1; (c)将S1划分成两个流S2和S3; (d)使S3在分馏装置中进行汽 - 液分馏,得到耗尽至少一种B成分的蒸汽馏分流S4; (e)将至少一部分S4,任选地在后处理之后再循环至(a)。