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    METHOD FOR PRODUCING DIPHENYL CARBONATE
    1.
    发明公开
    METHOD FOR PRODUCING DIPHENYL CARBONATE 审中-实审

    公开(公告)号：EP4421063A1

    公开(公告)日：2024-08-28

    申请号：EP22883592.2

    申请日：2022-10-19

    申请人： Asahi Kasei Kabushiki Kaisha

    发明人： AKATSUKA, Kenji

    IPC分类号： C07C68/06 ,  C07C68/08 ,  C07C69/96

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

    摘要： Provided is a method for producing diphenyl carbonate, comprising a first purification step of continuously introducing a reaction mixture containing diphenyl carbonate obtained by specific steps to a high-boiling substance separation column A, and continuously separating by distillation the mixture into a column top component (AT) containing diphenyl carbonate and a column bottom component (AB) containing a catalyst; a specific second purification step; and two specific circulation steps, wherein a mass concentration ratio (DPC/HB) of diphenyl carbonate to a high-boiling substance in the column bottom component (AB) of the high-boiling substance separation column A is 0.1 to 1.0, and a mass concentration ratio (DPC/catalyst) of the diphenyl carbonate to the catalyst is 1.0 to 10.0.

    METHOD FOR PRODUCING HIGH-PURITY DIARYL CARBONATE
    2.
    发明公开
    METHOD FOR PRODUCING HIGH-PURITY DIARYL CARBONATE 审中-实审

    公开(公告)号：EP4414357A1

    公开(公告)日：2024-08-14

    申请号：EP22878549.9

    申请日：2022-10-05

    申请人： Asahi Kasei Kabushiki Kaisha

    发明人： OCHI, Hiroyuki

    IPC分类号： C07C68/08 ,  B01D3/14 ,  C07C68/06 ,  C07C69/96

    CPC分类号： Y02P20/10 ,  C07C68/06 ,  C07C68/08 ,  C07C69/96 ,  B01D3/14

    摘要： Provided is a method for industrially producing high-purity diaryl carbonate, comprising: a first purification step of continuously introducing a mixture containing diaryl carbonate to a purifying column A having a side cut discharge port, and continuously separating by distillation the mixture into a column top component (At), a side cut component (As) containing diaryl carbonate, and a column bottom component (Ab) containing a catalyst; and a second purification step of continuously introducing the side cut component (As) to a diaryl carbonate purifying column B having a side cut discharge port, and continuously separating by distillation the component into three components, a column top component (Bt), a side cut component (Bs), and a column bottom component (Bb), thereby obtaining high-purity diaryl carbonate as the side cut component (Bs).

    PROCESS FOR THE PRODUCTION OF HIGH-PURITY DIMETHYL CARBONATE
    7.
    发明公开
    PROCESS FOR THE PRODUCTION OF HIGH-PURITY DIMETHYL CARBONATE 有权
    工艺生产高纯度二

    公开(公告)号：EP2496547A1

    公开(公告)日：2012-09-12

    申请号：EP10790588.7

    申请日：2010-10-29

    申请人： versalis S.p.A.

    发明人： GHIRARDINI, Maurizio ,  DE NARDO, Laura ,  NOVELLO, Elena

    IPC分类号： C07C69/06 ,  C07C68/08

    CPC分类号： C07C68/08 ,  C07C69/96

    摘要： A process for producing a high-purity dimethyl carbonate, which includes: (I) cooling a commercial grade dimethyl carbonate containing 1 ppm or more of chlorine to a temperature from +6° C. to −5° C. at a rate from 0.5-2° C./hour, to obtain a first solid dimethyl carbonate; (II) heating the first solid dimethyl carbonate to a temperature from −5° C. to +6° C. at a rate of 1-5° C./hour, to obtain a mixture comprising a second solid dimethyl carbonate and a predetermined amount of a first liquid dimethyl carbonate; (III) separating the first liquid dimethyl carbonate from the mixture, to obtain the second solid dimethyl carbonate; (IV) heating the second solid dimethyl carbonate to a temperature from 20° C. to 40° C., to obtain a second liquid dimethyl carbonate, wherein the second liquid dimethyl carbonate has a purity degree higher than 99.99% and a chlorine content lower than or equal to 1 ppm.

    PROCESS FOR INDUSTRIAL PRODUCTION OF DIALKYL CARBONATE AND DIOL
    10.
    发明公开
    PROCESS FOR INDUSTRIAL PRODUCTION OF DIALKYL CARBONATE AND DIOL 审中-公开
    METHOD FOR碳酸二烷基酯和二醇的工业生产

    公开(公告)号：EP1967242A4

    公开(公告)日：2009-01-07

    申请号：EP06842908

    申请日：2006-12-20

    申请人： ASAHI KASEI CHEMICALS CORP

    发明人： FUKUOKA SHINSUKE ,  MIYAJI HIRONORI ,  HACHIYA HIROSHI ,  MATSUZAKI KAZUHIKO

    IPC分类号： B01D3/14 ,  B01D3/22 ,  B01D3/32 ,  C07B61/00 ,  C07C27/02 ,  C07C29/128 ,  C07C31/20 ,  C07C68/06 ,  C07C68/08 ,  C07C69/96

    CPC分类号： B01D3/009 ,  B01D3/32 ,  C07C68/065 ,  C07C68/08 ,  Y02P20/127 ,  Y02P20/582 ,  C07C69/96

    摘要： The invention aims at providing a specific process for mass production of dialkyl carbonate and diol by a reaction -distillation process of feeding a raw material consisting of a cyclic carbonate and an aliphatic monohydric alcohol continuously into a continuous multi-stage distillation column to conduct reaction and distillation simultaneously in the column, which enables long-time stable production of both with high selectivity and high productivity and long-time stable and efficient separation and purification of product dialkyl carbonate. It has been found that the production of dialkyl carbonate and diol with respective high selectivities of 95% or above and stable production of high-purity dialkyl carbonate on an industrial scale of at least two tons per hour over a long term of 1000 hours or longer in a high yield are attained by conducting the reaction and distillation in a continuous multi-stage distillation column (A) having a specific structure and separating the obtained overhead component (AT) through distillation by the use of a continuous multi-stage distillation column (B) having a specific structure.