Method for controlling the process for making isocyanates

    公开(公告)号:US10227294B2

    公开(公告)日:2019-03-12

    申请号:US15767870

    申请日:2016-09-28

    摘要: The invention relates to a method for preparing an aromatic polyisocyanate in an isocyanate plant comprising a reaction section for a phosgenation reaction, wherein a primary aromatic amine is reacted with phosgene compounds in a reaction section to obtain an isocyanate comprising reaction product and wherein CO2 concentration in the gases coming from the reaction section is measured and analyzed, and wherein the conditions in the phosgenation reaction are adjusted in case the CO2 concentration in the gases coming from the reaction section is higher than a background CO2 concentration.

    Reactive recovery of dimethyl carbonate from dimethyl carbonate/methanol mixtures
    20.
    发明授权
    Reactive recovery of dimethyl carbonate from dimethyl carbonate/methanol mixtures 有权
    从碳酸二甲酯/甲醇混合物中回收碳酸二甲酯

    公开(公告)号:US09284293B2

    公开(公告)日:2016-03-15

    申请号:US13819373

    申请日:2011-08-19

    申请人: Haibo Zhao Mark Posey

    发明人: Haibo Zhao Mark Posey

    摘要: A method of producing a carbonate product including mixing a DMC and methanol mixture with an alcohol, reacting the DMC with the alcohol to form carbonate product, and removing a substantial portion of unreacted DMC and methanol. In one embodiment, the method may be repeated to reach a desired alcohol conversion by adding more DMC and methanol mixture.

    摘要翻译: 一种制备碳酸酯产品的方法,包括将DMC和甲醇混合物与醇混合,使DMC与醇反应以形成碳酸酯产物,并除去大部分未反应的DMC和甲醇。 在一个实施方案中,可以重复该方法以通过加入更多的DMC和甲醇混合物达到所需的醇转化率。