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    Energy-saving method for preparing electronic-grade carbonate
    1.
    发明授权
    Energy-saving method for preparing electronic-grade carbonate 有权

    公开(公告)号：US12037316B2

    公开(公告)日：2024-07-16

    申请号：US18254846

    申请日：2022-10-11

    申请人： TIANJIN UNIVERSITY OF SCIENCE & TECHNOLOGY

    发明人： Hongxing Wang ,  Haiyong Li ,  Guangqiang Zheng ,  Fei Li

    IPC分类号： C07C68/08 ,  C07C68/06

    CPC分类号： C07C68/08 ,  C07C68/06 ,  Y02P20/10

    摘要： The present disclosure discloses an energy-saving method for preparing electronic-grade carbonate, including the following steps that: industrial-grade dimethyl carbonate and anhydrous ethanol enter a reaction process after being preheated by a preheater, and are subjected to an esterification reaction under the action of a catalyst to obtain a mixture containing dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate, and an azeotrope of dimethyl carbonate and methanol; the above-mentioned mixture enters a recovery process of dimethyl carbonate to recover unreacted dimethyl carbonate; a mixture of ethyl methyl carbonate and diethyl carbonate then enters a crude separation process to obtain crude ethyl methyl carbonate and crude diethyl carbonate; and the crude ethyl methyl carbonate is subjected to a refining process of ethyl methyl carbonate to obtain electronic-grade ethyl methyl carbonate, and the crude diethyl carbonate is subjected to a refining process of diethyl carbonate to obtain electronic-grade diethyl carbonate.

    PREPARING METHOD OF ALIPHATIC POLYCARBONATE
    8.
    发明申请
    PREPARING METHOD OF ALIPHATIC POLYCARBONATE 审中-公开

    公开(公告)号：US20180086880A1

    公开(公告)日：2018-03-29

    申请号：US15721739

    申请日：2017-09-30

    申请人： CHENGDU ORGANIC CHEMICALS CO., LTD. CHINESE ACADEMY OF SCIENCES

    发明人： Gongying WANG ,  Ziqing WANG ,  Xiangui YANG ,  Hua ZHANG ,  Jianguo LI ,  Shaoying LIU ,  Jie YAO

    IPC分类号： C08G64/02 ,  C07C69/96 ,  C07C68/06

    CPC分类号： C08G64/02 ,  C07C68/06 ,  C07C69/96 ,  C08G64/16 ,  C08G64/30 ,  C08G64/305

    摘要： A preparing method of an aliphatic polycarbonate is provided to synthesize oligomer monomers by a transesterification reaction of carbonic acid dialkyl esters and aliphatic diols with accelerants in an atmosphere of a protective gas, and generate an aliphatic polycarbonate polymer by a polycondensation reaction of the oligomer monomers in a condition of high temperature and low pressure. According to the disclosure, environmentally friendly compounds with low boiling points and low costs are utilized as the accelerants to substitute the enzyme or acid-base catalysts to prepare aliphatic polycarbonate polymers in the prior art, and the cost is reduced; meanwhile, in the process of generating the aliphatic polycarbonate polymers, the accelerants can be removed from the reaction system along with the pressure reduced in the reaction system. The synthesis system is simple; moreover, the aliphatic polycarbonate obtained by the preparing method provided by the disclosure has merits such as superior colors.