71.
    发明专利
    未知

    公开(公告)号:DE59603658D1

    公开(公告)日:1999-12-23

    申请号:DE59603658

    申请日:1996-07-12

    Applicant: BASF AG

    Abstract: Prepn. of alkenes by partial hydrogenation of alkynes in the liq. phase at 20-250 degrees C and 0.3-200 bar partial hydrogen pressure using a palladium catalyst-comprises:(a) the use of a solid bed carrier-supported catalyst obtd. by tempering the carrier material in air, cooling, coating with metallic palladium under vacuum, shaping and processing into monolithic catalyst element; and (b) the addn. of 10-18 ppm carbon monoxide to the hydrogen.

    72.
    发明专利
    未知

    公开(公告)号:DE19810671A1

    公开(公告)日:1999-09-16

    申请号:DE19810671

    申请日:1998-03-12

    Applicant: BASF AG

    Abstract: 2,5,6-trimethyl-cyclohex-2-en-1-one (I) is prepared by continuously pumping diethylketone (II), crotonaldehyde (III) and an aqueous strong base through a pressure vessel in such a fashion that the reaction temperature is 150-350 degrees C and the average residence time in the pressure vessel is only 0.1 seconds to 20 minutes. Preparation of 2,5,6-trimethyl-cyclohex-2-en-1-one (I) comprises reaction of (i) diethylketone (II) with (ii) crotonaldehyde (III) (or a compound which is converted to (III) under the selected reaction conditions), in the presence of basic agents, at elevated temperatures. Component (ii) (1 mol), component (i) (5-30 mol) and an aqueous solution or suspension of a strong base are pumped continuously, via separate supply points or in the form of a mixture, into an optionally heated pressure vessel which can guarantee intensive mixing. The components are pumped to the vessel in such a fashion that the reaction temperature is 150-350 degrees C and the average residence time in the pressure vessel is only 0.1 seconds to 20 minutes.

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