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    5.
    发明专利
    未知

    公开(公告)号：DE3851400D1

    公开(公告)日：1994-10-13

    申请号：DE3851400

    申请日：1988-09-28

    Applicant: UNION CARBIDE CORP

    Inventor： CRANDALL JOHN WORTH ,  REAM BERNARD CLAUDE

    IPC: C07C27/00 ,  C07C29/149 ,  C07C29/80 ,  C07C31/20 ,  C07C67/00

    Abstract: A process is described for recovering polyester-grade ethylene glycol from crude ethylene glycol containing at least one component which has a normal boiling point below that of ethylene glycol, and which can form a UV absorber in the presence of ethylene glycol which comprises supplying to an ethylene glycol distillation system, preferably comprising a fractional distillation zone having an upper portion, a lower portion and an intermediate portion a crude ethylene glycol stream at a determined pH of less than about 7.5; maintaining within the intermediate portion of the fractional distillation zone a diluent having a boiling point below that of the at least one component, such as methanol, at a concentration sufficient to reduce the formation of UV absorber in the intermediate portion wherein at least ethylene glycol, the at least one component and the diluent, are present, and withdrawing ethylene glycol substantially free of the at least one component from the lower portion of the fractional distillation zone.

    8.
    发明专利
    未知

    公开(公告)号：DE2855232A1

    公开(公告)日：1979-06-28

    申请号：DE2855232

    申请日：1978-12-21

    Applicant: UNION CARBIDE CORP

    Inventor： MCMULLEN CHARLES HENRY ,  NELSON JAMES RUSSELL ,  REAM BERNARD CLAUDE ,  SIMS JUN JOSEPH ALTON

    IPC: C07D317/36 ,  C07D317/38 ,  C07D319/06

    Abstract: A process for making alkylene carbonate by the reaction of carbon dioxide and an alkylene oxide of the formula wherein R, R1, R2 and R3 are one or more of hydrogen, alkyl, aryl, alkaryl, aralkyl, cycloalkyl, allyloxy, chloroalkyl, and aryloxy to produce the corresponding carbonate, which comprises: (a) providing a homogeneous liquid phase reaction zone in which the predominant material therein is the alkylene carbonate; (b) providing a catalytic amount of an alkylene oxide carbonation catalyst to said liquid phase; (c) having dissolved in said liquid phase sufficient CO2 to provide a molal amount therein which exceeds the molal amount of the catalyst; (d) providing a CO2 pressure in the reaction zone of between about 150 psig and about 750 psig; (e) maintaining a sufficient amount of the alkylene oxide in the reaction to maintain the pressure and temperature thereof; (f) maintaining the reaction zone at a temperature at which the alkylene oxide and CO2 react to form alkylene carbonate, which temperature is not greater than about 200 DEG C.; and (g) correlating the reaction zone temperature and pressure to yield an alkylene carbonate efficiency of at least about 99% and a conversion of at least 99.5%.

    PROCESS FOR REFINING ETHYLENE GLYCOL
    9.
    发明专利
    PROCESS FOR REFINING ETHYLENE GLYCOL 未知

    公开(公告)号：ZA887281B

    公开(公告)日：1989-06-28

    申请号：ZA887281

    申请日：1988-09-28

    Applicant: UNION CARBIDE CORP

    Inventor： CRANDALL JOHN WORTH ,  JOHN WORTH CRANDALL ,  REAM BERNARD CLAUDE ,  BERNARD CLAUDE REAM

    IPC: C07C27/00 ,  C07C29/149 ,  C07C29/80 ,  C07C31/20 ,  C07C67/00 ,  B01D ,  B01F

    Abstract: A process is described for recovering polyester-grade ethylene glycol from crude ethylene glycol containing at least one component which has a normal boiling point below that of ethylene glycol, and which can form a UV absorber in the presence of ethylene glycol which comprises supplying to an ethylene glycol distillation system, preferably comprising a fractional distillation zone having an upper portion, a lower portion and an intermediate portion a crude ethylene glycol stream at a determined pH of less than about 7.5; maintaining within the intermediate portion of the fractional distillation zone a diluent having a boiling point below that of the at least one component, such as methanol, at a concentration sufficient to reduce the formation of UV absorber in the intermediate portion wherein at least ethylene glycol, the at least one component and the diluent, are present, and withdrawing ethylene glycol substantially free of the at least one component from the lower portion of the fractional distillation zone.

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