Process for removing by-products from diurethanes
    1.
    发明授权
    Process for removing by-products from diurethanes 失效
    从二氨基甲酸酯中除去副产物的方法

    公开(公告)号:US5646328A

    公开(公告)日:1997-07-08

    申请号:US667893

    申请日:1996-06-20

    CPC分类号: C07C269/08

    摘要: Low-boiling by-products are removed from diurethanes prepared by a phosgene-free process by carrier vapor distillation using alcohol vapor, preferably the vapor of the basic alcohol found in the diurethane, as the carrier vapor. The diurethanes freed of low-boiling by-products in this manner may be thermally decomposed to produce diisocyanates.

    摘要翻译: 作为载体蒸气,使用乙醇蒸气(优选二氨基甲酸乙酯中发现的碱性醇的蒸气)作为载体蒸气,通过载气蒸气蒸馏由无光气的方法制备的低沸点副产物被除去。 以这种方式排出低沸点副产物的二氨基甲酸酯可以被热分解以产生二异氰酸酯。

    Process for the purification of epsilon-caprolactam
    9.
    发明授权
    Process for the purification of epsilon-caprolactam 失效
    ε-己内酰胺纯化方法

    公开(公告)号:US4148793A

    公开(公告)日:1979-04-10

    申请号:US832002

    申请日:1977-09-09

    IPC分类号: C07D201/16

    CPC分类号: C07D201/16

    摘要: Process for the removal of residues of solvent from crystallized .epsilon.-caprolactam, wherein the major quantity of solvent is removed in a first stage by distillation in the presence of water in an amount so that the water content of the residue of the first stage is from 0.5 to 6% by weight, and in a second stage by distilling water and any residues of solvent still present.

    摘要翻译: 从结晶的ε-己内酰胺中除去溶剂残留物的方法,其中在第一阶段通过在水存在下蒸馏除去主要量的溶剂,其量使得第一阶段的残留物的水含量来自 0.5至6重量%,并且在第二阶段通过蒸馏水和仍然存在的溶剂的任何残留物。