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    PROCESS FOR PREPARATION OF ISOPROPENYLPHENOL
    4.
    发明授权
    PROCESS FOR PREPARATION OF ISOPROPENYLPHENOL 失效

    公开(公告)号：KR820002005B1

    公开(公告)日：1982-10-24

    申请号：KR790002918

    申请日：1979-08-27

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： KATO NOBUKATSU ,  TAKASE TSUTOMU ,  MORIMOTO YOSHIO ,  YUASA TERUO ,  HATTORI MINORU

    IPC: C07C39/06

    Abstract: Isopropenyl phenol is produced by the thermal decomposition of its oligomers. Process comprises continuously feeding the oligomers into an inert organic reaction medium; heating to 150-250≦̸C at 10-100 mm Hg at a rate such that the concn. of oligomers is not more than 30 wt.% and continuously distilling off the prod. and recovering it. The medium is a high boiling organic solvent of melting or softening point not more than 150≦̸C and a lower vapour pressure than the prod. at the oligomer decomposition temp. Prods. have reduced contents of impurities.

    5.
    发明专利
    未知

    公开(公告)号：DE68906562T2

    公开(公告)日：1994-01-13

    申请号：DE68906562

    申请日：1989-02-21

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： IIMURO SHIGERU ,  MORIMOTO YOSHIO ,  KITAMURA TAKASHI

    IPC: C07C37/84 ,  C07C39/16

    Abstract: A process for crystallizing the adduct of bisphenol A with phenol from a phenol solution in the presence of water comprises controlling the concentration of bisphenol A in said solution by removing part of phenol from said solution or adding phenol to said solution according to feedback control based on the measurement of solution density to obtain an adjusted solution, and feeding the adjusted solution to the crystallizer in which its inside wall is kept at a temperature higher than that of the adjusted solution, provided the temperature difference being smaller than 5 DEG C. The crystallized adduct has a uniform particle size and a high purity.

    6.
    发明专利
    未知

    公开(公告)号：DE68902654T2

    公开(公告)日：1993-03-11

    申请号：DE68902654

    申请日：1989-02-14

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： IIMURO SHIGERU ,  MORIMOTO YOSHIO ,  KITAMURA TAKASHI

    IPC: B01J27/10 ,  C07B61/00 ,  C07C27/00 ,  C07C37/20 ,  C07C37/82 ,  C07C39/16 ,  C07C67/00

    Abstract: A process for producing high-purity bisphenol A comprises reacting phenol with acetone in the presence of an acid catalyst to obtain a product mixture, removing the acid catalyst from the product mixture, thereby yielding a liquid mixture, treating the liquid mixture with a weakly basic ion-exchange resin having pyridyl groups as the exchange groups, and purifying the treated liquid mixture. The process does not cause any corrosion of equipment and any decomposition and discoloration of bisphenol A during distillation.

    PROCESS FOR PREPARING HIGH-PURITY BISPHENOL A
    7.
    发明专利
    PROCESS FOR PREPARING HIGH-PURITY BISPHENOL A 未知

    公开(公告)号：CA1311498C

    公开(公告)日：1992-12-15

    申请号：CA593304

    申请日：1989-03-10

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： IIMURO SHIGERU ,  MORIMOTO YOSHIO ,  KITAMURA TAKASHI

    IPC: C07C39/16 ,  C07C37/20 ,  C07C37/84

    Abstract: 27979-10 Disclosed is a method for preparing high-purity bisphenol A. The method comprises a principal process and a subprocess. The principal, process comprises a first reaction step for reacting phenol with acetone, a first concentration adjusting step, a first crystallization step for precipitating crystals of the adduct of bisphenol A with phenol, a first separation step for separating a solution containing the crystals of the adduct into the crystals and the mother liquor and a phenol removing step for removing phenol from the crystals of the adduct. The sub-process comprises a second reaction step for reacting p-isopropenylphenol with phenol, a second concentration adjusting step, a second crystallization step, a second separation step for separating a solution containing the second crystals of the adduct into the second crystals and the second mother liquor and a cleaving step. The first mother liquor from the principal process is fed to the sub-process and the second crystals of the adduct from the subprocess are fed to the principal process. Also disclosed is a method for preparing high-purity bisphenol A which comprises a principal process and a sub-process. The principal process comprises a first reaction/catalyst removing step for reacting phenol with acetone and removing the catalyst, a crystallization step for precipitating the adduct of bisphenol A with phenol, a solid-liquid separation step for separating the reaction solution into the crystals of the adduct and the mother liquor and a phenol removing step for removing phenol from the adduct crystals. The sub-process comprises a second reaction/catalyst removing step for reacting p-isopropenylphenol with phenol and removing the 27979-10 catalyst, a second phenol removing step, a distillation step for separating bisphenol A and low boiling and high boiling substances and a cleaving step. The mother liquor from the principal process is fed to the sub-process and the distilled bisphenol A from the sub-process is fed to the principal process.

    8.
    发明专利
    未知

    公开(公告)号：DE68902654D1

    公开(公告)日：1992-10-08

    申请号：DE68902654

    申请日：1989-02-14

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： IIMURO SHIGERU ,  MORIMOTO YOSHIO ,  KITAMURA TAKASHI

    IPC: B01J27/10 ,  C07B61/00 ,  C07C27/00 ,  C07C37/20 ,  C07C37/82 ,  C07C39/16 ,  C07C67/00

    Abstract: A process for producing high-purity bisphenol A comprises reacting phenol with acetone in the presence of an acid catalyst to obtain a product mixture, removing the acid catalyst from the product mixture, thereby yielding a liquid mixture, treating the liquid mixture with a weakly basic ion-exchange resin having pyridyl groups as the exchange groups, and purifying the treated liquid mixture. The process does not cause any corrosion of equipment and any decomposition and discoloration of bisphenol A during distillation.

    PROCESS FOR WASHING AND OBTAINING SOLIDS OF SLURRY
    9.
    发明专利
    PROCESS FOR WASHING AND OBTAINING SOLIDS OF SLURRY 未知

    公开(公告)号：CA1291170C

    公开(公告)日：1991-10-22

    申请号：CA591416

    申请日：1989-02-07

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： IIMURO SHIGERU ,  MORIMOTO YOSHIO ,  KITAMURA TAKASHI

    IPC: C07C37/70 ,  C07C37/84 ,  C07C39/16

    Abstract: 27979-6 A process for washing and obtaining solids of a slurry comprises feeding a slurry containing the adduct of bisphenol A with phenol crystallized from a phenol solution of bisphenol A to a first solid-liquid separator to separate solids from the slurry, transferring the solids separated by the first solid-liquid separator to an agitation tank in which the solids are reslurried, feeding the slurry obtained in the agitation tank to a second solid-liquid separator, said second solid-liquid separator being intended to obtain the solids from the slurry discharged from the agitation tank, and permitting the admission of a washing solvent to wash the solids, and permitting the filtrate and washings to be recovered independently, feeding the washing solvent to the second solid-liquid separator, feeding all of the washings from the second solid-liquid separator to the agitation tank, feeding a part of the filtrate from the second solid-liguid separator to the agitation tank, and discharging the remainder of the filtrate from the system. The process makes it possible to produce a high-purity adduct of bisphenol A with phenol and hence high-purity bisphenol A.

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