Process for removing by-products from diurethanes
    2.
    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。