申请人:BASF SE
公开号:WO2016066629A1
公开(公告)日:2016-05-06
A continuous process for the preparation of propylene oxide, comprising (a) reacting propene with hydrogen peroxide in a reaction apparatus in the presence of acetonitrile as solvent, obtaining a stream SO containing propylene oxide, acetonitrile, water, at least one further component B wherein the normal boiling point of the at least one component B is higher than the normal boiling point of acetonitrile; (b) separating propylene oxide from SO, obtaining a stream SI 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 first fractionation unit, obtaining a vapor fraction stream S4 a being depleted, relative to S3, of at least one of the at least one component B and obtaining a liquid bottoms stream S4b, and subjecting at least part of the vapor fraction stream S4 a to a vapor-liquid fractionation in a second fractionation unit, obtaining a vapor fraction stream S4c and a liquid bottoms stream S4 being depleted, relative to S4a, of at least one of the at least one component B; (e) recycling at least a portion of S4, optionally after work-up, to (a).
一种制备丙烯氧的连续工艺,包括(a)在存在乙腈作为溶剂的反应装置中,将丙烯与过氧化氢反应,得到含有丙烯氧、乙腈、水和至少一种进一步组分B的流SO;(b)从SO中分离丙烯氧,得到含有乙腈、水和至少一种进一步组分B的流SI;(c)将S1分成两个流S2和S3;(d)在第一分馏装置中对S3进行汽液分馏,得到贫化至少一种组分B的汽相流S4a相对于S3,并得到液体底流S4b,并对至少部分汽相流S4a进行第二分馏装置的汽液分馏,得到汽相流S4c和贫化至少一种组分B的液体底流S4;(e)将至少一部分S4回收,可选地经过后续处理后返回(a)。