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    • 3. 发明授权
    • Separation of 1,4-butanediol from hydrogenation mixtures
    • 从氢化混合物中分离出1,4-丁二醇
    • US5342488A
    • 1994-08-30
    • US18496
    • 1993-02-17
    • Hans-Juergen GoschHarald RustRolf FischerClaus HechlerRolf Pinkos
    • Hans-Juergen GoschHarald RustRolf FischerClaus HechlerRolf Pinkos
    • C07C29/80C07C29/82C07C31/20B01D3/00C07C27/00
    • C07C29/80Y10S203/20
    • A process for the separation of 1,4-butanediol from mixtures obtained by the catalytic hydrogenation of maleates, fumarates, and/or succinates, which also contain tetrahydrofuran, water, C.sub.1 -C.sub.4 alcohols, succinic diesters, hydroxybutyrates, alkylhydroxyalkyl succinates, gamma-butyrolactone and butyrates, in addition to 1,4-butanediol, comprising the following steps:a) separating, in a first column having an actual number of plates of from 20 to 70 and operated at a top pressure of from 50 to 1100 mbar and preferably from 50 to 500 mbar and a top temperature of from 40.degree. to 120.degree. C., alcohol, water and tetrahydrofuran, as overhead product,b) feeding the bottom product of the first column into a second column having an actual number of plates of from 30 to 90 and withdrawing the overhead product consisting of alcohol and butyrate and obtained at a top pressure of from 45 to 250 mbar and a top temperature of from 45.degree. to 120.degree. C., and withdrawing gamma-butyrolactone and butyrates through a side outlet, and feeding the bottom product to a phase separator,c) feeding the 1,4-butanediol-enriched bottom phase of the liquid two-phase mixture coming from the phase separator to a third column having an actual number of plates of from 30 to 90, alcohol being distilled off as overhead product at a top pressure of from 45 to 250 mbar and a top temperature of from 45.degree. to 120.degree. C., and the azeotrope comprising 1,4 -butanediol and succinic diester is withdrawn as a sidestream and recycled to the phase separator, whilst 1,4-butanediol is removed together with alkyl-hydroxyalkyl succinate, butyl hydroxybutyrate, and high-boiling fractions as bottoms, andd) separating the succinate-enriched top phase in the phase separator.
    • 还含有四氢呋喃,水,C 1 -C 4醇,琥珀酸二酯,羟基丁酸酯,琥珀酸烷基羟基烷基酯,γ-丁内酯和/或琥珀酸酯的马来酸盐,富马酸盐和/或琥珀酸盐的催化氢化得到的混合物的分离方法, 丁内酯和丁酸酯除了1,4-丁二醇外还包括以下步骤:a)在具有20至70的实际板数的第一塔中分离并在50至1100毫巴的最高压力下操作,以及 优选为50至500毫巴,顶部温度为40至120℃,醇,水和四氢呋喃作为塔顶产物,b)将第一塔的底部产物进料到具有实际数量的板的第二塔 30至90份,并取出由醇和丁酸盐组成的塔顶产物,并在顶部压力为45至250毫巴,顶部温度为45至120℃下获得,并将γ-丁内酯和丁酸酯 通过侧出口将底部产物供给到相分离器中,c)将来自相分离器的液体两相混合物的富含1,4-丁二醇的底相进料到具有实际数量的板的第三塔 为30至90,在顶部压力为45至250毫巴,顶部温度为45至120℃的条件下,蒸馏出作为塔顶产物的醇,由1,4-丁二醇和琥珀酸二酯组成的共沸物为 作为侧流回收并循环到相分离器中,而1,4-丁二醇与琥珀酸烷基 - 羟基烷基酯,羟基丁酸丁酯和作为塔底产物的高沸点馏分一起除去,以及d)在相中分离富含琥珀酸酯的顶相 分隔器。