Purification of tetrahydrofuran by distillation
    4.
    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。

    Preparation of tetrahydrofuran
    6.
    发明授权
    Preparation of tetrahydrofuran 失效
    四氢呋喃的制备

    公开(公告)号:US4588827A

    公开(公告)日:1986-05-13

    申请号:US703770

    申请日:1985-02-21

    IPC分类号: C07D307/08

    CPC分类号: C07D307/08

    摘要: Tetrahydrofuran is prepared from a crude alkaline aqueous solution of butane-1,4-diol, as obtained by reaction of acetylene with aqueous formaldehyde and catylytic hydrogenation of the resulting but-2-yne-1,4-diol solution by a process in which the alkaline solution is first neutralized with sulfuric acid and water is then eliminated in the liquid phase at from 200.degree. to 260.degree. C., under superatmospheric pressure and in the presence of phosphoric acid.

    摘要翻译: 四氢呋喃由丁烷-1,4-二醇的粗碱性水溶液制备,通过乙炔与甲醛水溶液的反应获得,并通过以下方法对所得丁-2-炔-1,4-二醇溶液进行溶解氢化,其中 碱性溶液首先用硫酸中和,然后在超高压和磷酸存在下,在200〜260℃的液相中除去水。