5.
    发明专利
    未知

    公开(公告)号:DE3926709A1

    公开(公告)日:1991-02-14

    申请号:DE3926709

    申请日:1989-08-12

    Applicant: BASF AG

    Abstract: A process for the continuous synthesis of dialkyl carbonates of the general formula I (I) in which R denotes C1-C4-alkyl, by reaction of C1-C4-alkanols with carbon monoxide and oxygen at elevated temperature and pressure and in the presence of a copper-containing catalyst dissolved or suspended in the reaction medium, wherein a) a gas stream containing carbon monoxide and oxygen is bubbled through the alkanol/catalyst mixture present in the reactor at a rate of from 1 to 100 liters per hours per gram of copper present in the reactor, part of which gas stream reacts with the alkanol to form dialkyl carbonate and water, which components are continuously entrained, together with alkanol, as a gaseous mixture, from the reaction mixture by means of the remaining, unreacted portion of the carbon monoxide/oxygen gas stream, whereupon b) the resulting gaseous mixture is separated, in a separator, into gaseous and liquid phases, the gaseous phase being recycled to the reactor if desired, and c) the liquid phase, which essentially consists of dialkyl carbonate, water and alkanol, is separated into its components, the dialkyl carbonate being isolated and the alkanol, if desired, recycled to the reactor, and d) the liquid in the reactor is replenished by adding fresh or recycled alkanol at the rate at which the alkanol is consumed and discharged.

    7.
    发明专利
    未知

    公开(公告)号:DE3323654A1

    公开(公告)日:1985-01-03

    申请号:DE3323654

    申请日:1983-07-01

    Applicant: BASF AG

    Abstract: 1. A process for the preparation of acetic and methyl acetate by gas-phase carbonylation of methanol in the presence of a nickel-containing catalyst and in the presence of chlorine, bromine or iodine or a volatile compound of one of these halogens as promoter, wherein the catalyst used is one whose active material consists of at least 40% by weight of nickel, and the catalyst contains from 0,001 to 1 part by weight of palladium per part by weight of nickel.

    10.
    发明专利
    未知

    公开(公告)号:DE59006008D1

    公开(公告)日:1994-07-14

    申请号:DE59006008

    申请日:1990-08-03

    Applicant: BASF AG

    Abstract: Process for the preparation of dialkyl carbonates of the general formula I in which R represents a C1- to C10-alkyl group, by reacting the alcohols R OH with a gaseous carbon monoxide/oxygen mixture in the presence of a copper catalyst and of a cosolvent, at increased temperature and under increased pressure, in which the cosolvent used is a cyclic urea of the general formula II in which n is the number 2, 3 or 4 and R represents hydrogen or a C1- to C4-alkyl group.

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