申请人:Gobbel Hans-Georg
公开号:US20060161010A1
公开(公告)日:2006-07-20
The invention relates to a process for the epoxidation of an olefin comprising (a) reacting the olefin with hydrogen peroxide in the presence of methanol as solvent in at least two reaction stages to obtain a mixture (M-a) comprising olefin oxide, unreacted olefin, methanol and water, wherein between at least two reaction stages, olefin oxide is separated by distillation; (b) separating unreacted olefin from the mixture (M-a) by distillation to obtain a mixture (M-bi) comprising at least 80 wt.-% of olefin and a mixture (M-bii) comprising methanol, water and at least 7 wt.-% of olefin oxide; (c) separating olefin oxide from the mixture (M-bii) in at least one distillation stage to obtain a mixture (M-ci) comprising at least 99 wt.-% of oletin oxide and a mixture (M-cii) comprising water and at least 55 wt.-% of methanol; (d) separating methanol from the mixture (M-cii) in at least one distillation stage to obtain a mixture (M-di) comprising at least 85 wt.-% of methanol and up to 10 wt.-% of water, and a mixture (M-dii) comprising at least 90 wt.-% of water; wherein a vapor top stream (Td) obtained from at least one distillation column used in (d), said vapor top stream (Td) comprising at least 85 wt.-% methanol, is used to operate at least partially at least one vaporizer used in at least one distillation column used in at least one of stages (a), (b) and (c).
该发明涉及一种烯烃环氧化的工艺,包括(a) 在至少两个反应阶段中,在甲醇作为溶剂的存在下,将烯烃与过氧化氢反应,以获得包含烯烃氧化物、未反应的烯烃、甲醇和水的混合物(M-a),在至少两个反应阶段之间,通过蒸馏分离烯烃氧化物;(b) 通过蒸馏将未反应的烯烃从混合物(M-a)中分离,以获得含有至少80重量%烯烃的混合物(M-bi)和含有甲醇、水和至少7重量%烯烃氧化物的混合物(M-bii);(c) 在至少一个蒸馏阶段中,将烯烃氧化物从混合物(M-bii)中分离,以获得含有至少99重量%烯烃氧化物的混合物(M-ci)和含有水和至少55重量%甲醇的混合物(M-cii);(d) 在至少一个蒸馏阶段中,将甲醇从混合物(M-cii)中分离,以获得含有至少85重量%甲醇和最多10重量%水的混合物(M-di),以及含有至少90重量%水的混合物(M-dii);其中从(d)中使用的至少一个蒸馏柱获得的蒸汽顶流(Td),该蒸汽顶流(Td)含有至少85重量%甲醇,用于至少部分操作用于至少一个反应阶段(a)、(b)和(c)中的至少一个蒸馏柱的至少一个蒸发器。