Isolation of neopentyl glycol hydroxypivalate (NGH)
    9.
    发明授权
    Isolation of neopentyl glycol hydroxypivalate (NGH) 失效
    新戊二醇羟基新戊酸(NGH)的分离

    公开(公告)号:US6048441A

    公开(公告)日:2000-04-11

    申请号:US121865

    申请日:1998-07-24

    摘要: Neopentyl glycol hydroxypivalate (NGH) is isolated from a mixture containing NGH, lower- and higher-boiling products and inorganic salts and purified in a two-stage process, whereinin a first separation stage, the inorganic salts and part of the higher-boiling products are separated off in a wiped-film evaporator and a vapor stream consisting of NGH, lower- and higher-boiling products is discharged and fed to a heat exchanger and condensed therein,and, in a second separation stage, the resulting condensate is distilled in a rectification column from which NGH is taken off in a side stream and condensed. Further discharges of the rectification column containing lower-boiling products or higher-boiling products are separately taken off. The higher-boiling products which comprise residual NGH are partly or completely recycled to the lower region of the rectification column.

    摘要翻译: 从含有NGH,低沸点产物和无机盐的混合物中分离新戊二醇羟基新戊酸(NGH),并在两步法中纯化,其中在第一分离阶段,无机盐和部分较高沸点 将产物在擦膜蒸发器中分离,并将由NGH,低沸点产物和较高沸点产物组成的蒸气流排出并进料至热交换器并在其中冷凝,并在第二分离阶段将所得冷凝物蒸馏 在精馏塔中,NGH从侧馏分物中脱离并浓缩。 另外排出含有低沸点产物或高沸点产物的精馏塔。 包含残留NGH的较高沸点产物部分或完全再循环到精馏塔的下部区域。