Purification of tetrahydrofuran by distillation
    1.
    发明授权
    Purification of tetrahydrofuran by distillation 失效
    通过蒸馏纯化四氢呋喃

    公开(公告)号:US4912236A

    公开(公告)日:1990-03-27

    申请号:US231277

    申请日:1988-08-12

    IPC分类号: C07D307/08

    CPC分类号: C07D307/08

    摘要: Crude water-containing tetrahydrofuran is purified by distillation by a process in which the crude tetrahydrofuran is passed through three distillation columns, water being removed from the bottom of the first column, water-containing tetrahydrofuran being recycled from the top of the second column into the first column, the top product of the third column being recycled to the first column, a distillate being removed at the top of the first column, and pure tetrahydrofuran being distilled off from the bottom product of the second column, in the third column, and the pure tetrahydrofuran being removed from the side take-off of the third column.

    摘要翻译: 通过蒸馏纯化粗含水四氢呋喃,其中粗四氢呋喃通过三个蒸馏塔,从第一塔的底部除去水,将含水四氢呋喃从第二塔的顶部再循环到 第一塔,第三塔的顶部产物被循环到第一塔,在第一塔的顶部除去的馏出物和在第三塔中从第二塔的底部产物蒸馏出的纯四氢呋喃和 将纯四氢呋喃从第三塔的侧馏分中除去。

    Manufacture of cyclic ethers
    2.
    发明授权
    Manufacture of cyclic ethers 失效
    环醚的制造

    公开(公告)号:US4203908A

    公开(公告)日:1980-05-20

    申请号:US942654

    申请日:1978-09-15

    CPC分类号: C07D307/08

    摘要: Cyclic ethers, especially tetrahydrofuran, are manufactured by dehydrating diols in the liquid phase in the presence of a bleaching earth as the catalyst and of a minor amount of an alkali metal or alkaline earth metal carbonate or bicarbonate.

    摘要翻译: 环状醚,特别是四氢呋喃,是通过在作为催化剂的漂白土和少量的碱金属或碱土金属碳酸盐或碳酸氢盐的存在下使液相中的二醇脱水来制备的。

    Polymerization of tetrahydrofuran
    3.
    发明授权
    Polymerization of tetrahydrofuran 失效
    四氢呋喃的聚合

    公开(公告)号:US4189566A

    公开(公告)日:1980-02-19

    申请号:US974118

    申请日:1978-12-29

    摘要: A process for the preparation of polybutylene glycol carboxylic acid diesters of the formulaR-CO-O--CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 -O).sub.n CO-R.sup.1by polymerizing pretreated tetrahydrofuran in the presence of one or more carboxylic acids and/or carboxylic acid anhydrides and of a polymerization catalyst, especially antimony pentachloride or a bleaching earth containing less than 3% by weight of water, wherein the tetrahydrofuran is treated with a strong mineral acid, an organic sulfonic acid, silica gel and/or a bleaching earth prior to the polymerization.

    摘要翻译: 通过在一种或多种羧酸和/或羧酸酐的存在下聚合预处理的四氢呋喃和聚合的方法制备式R-CO-O-CH 2 CH 2 CH 2 CH 2 -O)nCO-R 1的聚丁二醇羧酸二酯的方法 催化剂,特别是五氯化锑或含有小于3重量%水的漂白土,其中四氢呋喃在聚合之前用强无机酸,有机磺酸,硅胶和/或漂白土处理。

    Polymerization of tetrahydrofuran
    7.
    发明授权
    Polymerization of tetrahydrofuran 失效
    四氢呋喃的聚合

    公开(公告)号:US4243799A

    公开(公告)日:1981-01-06

    申请号:US40202

    申请日:1979-05-18

    IPC分类号: C08G18/48 C08G65/20 C08G65/26

    摘要: A process for the preparation of polybutylene glycol carboxylic acid diesters of the formulaR--CO--O--CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 --O).sub.n CO--R.sup.1by polymerizing pretreated tetrahydrofuran in the presence of one or more carboxylic acids and/or carboxylic acid anhydrides and of a polymerization catalyst, especially antimony pentachloride or a bleaching earth containing less than 3% by weight of water, wherein the tetrahydrofuran is treated with a strong mineral acid, an organic sulfonic acid, silica gel and/or a bleaching earth prior to the polymerization.

    摘要翻译: 通过在一种或多种羧酸和/或羧酸酐的存在下聚合预处理的四氢呋喃和聚合的方法制备式R-CO-O-CH 2 CH 2 CH 2 CH 2 -O)nCO-R 1的聚丁二醇羧酸二酯的方法 催化剂,特别是五氯化锑或含有小于3重量%水的漂白土,其中四氢呋喃在聚合之前用强无机酸,有机磺酸,硅胶和/或漂白土处理。