申请人:Japan Synthetic Rubber Co., Ltd.
公开号:US04268447A1
公开(公告)日:1981-05-19
A process for producing simultaneously tetrahydrofuran and 1,4-butanediol in any desired proportion which comprises (a) reacting the acetic ester of 1,4-butanediol with a theoretical or smaller quantity, based on said acetic ester, of water (preferably 0.2-0.8 mole of water per mole of said acetic ester) in the presence of an acidic catalyst, (b) distilling, in the first distillation column, the reaction mixture to separate it into a distillate comprising tetrahydrofuran as major constituent and a bottom stream comprising as major constituent the acetic ester of 1,4-butanediol and (c) subjecting, in the second reaction-distillation column, at least a part of said bottom stream to a counter-current gas-liquid contact reaction with methanol, the quantity of said methanol being preferably 1-5 moles per mole of the acetate group of the acetic ester, in the presence of an acidic or basic catalyst and, simultaneously therewith, separating the reaction mixture into a bottom stream comprising 1,4-butanediol as major constituent and a distillate comprising methyl acetate as major constituent. By this process, methanol and catalyst can be economized to a great extent.
一种同时生产四氢呋喃和1,4-丁二醇的方法,可以按任意所需比例进行,包括(a)在酸性催化剂的存在下,将1,4-丁二醇的乙酸酯与理论量或更小量的水(优选为每摩尔该乙酸酯0.2-0.8摩尔的水)反应;(b)在第一蒸馏柱中蒸馏反应混合物,将其分离成主要成分为四氢呋喃的馏出物和主要成分为1,4-丁二醇乙酸酯的底流;(c)在第二反应-蒸馏柱中,将至少部分底流与甲醇进行逆流气液接触反应,所述甲醇的量优选为每个乙酸酯的乙酸酯基1-5摩尔,在酸性或碱性催化剂的存在下,并同时将反应混合物分离成主要成分为1,4-丁二醇的底流和主要成分为乙酸甲酯的馏出物。通过此方法,可以大大节省甲醇和催化剂的使用。