45.
    发明专利
    未知

    公开(公告)号:DE19622497A1

    公开(公告)日:1997-12-11

    申请号:DE19622497

    申请日:1996-06-05

    Applicant: BASF AG

    Abstract: The invention concerns a process for preparing tetrahydrofuran by reacting 1,4-butene diol diethers of formulae (I) -RO-CH2-CH=CH-CH2-OR and/or (II) -RO-CH2-CH2=CH-CH2-OR, in which the R groups can be identical or different and stand for C1-C15 alkyl or cycloalkyl groups, C6-C12 aryl groups or C7-C15 aralkyl groups, with water and hydrogen at temperatures of between 20 and 300 DEG C and a pressure of between 1 and 300 bar in the presence of catalysts or catalyst combinations which both contain components which can hydrogenate and comprise acid or basic centres. The invention further concerns a novel process for preparing the 1,4-butene diol diethers of formula (I) by metathesis.

    46.
    发明专利
    未知

    公开(公告)号:DE59205953D1

    公开(公告)日:1996-05-15

    申请号:DE59205953

    申请日:1992-10-15

    Applicant: BASF AG

    Abstract: Process for the preparation of cycloalkanols by reacting cycloolefins with water in the presence of solid, acidic catalysts at a temperature from 50 to 280 DEG C under superatmospheric pressure, with the proviso that the pressure and temperature conditions suffice for the formation of a liquid phase of water and cycloolefins, characterised in that a mixture of water and cycloolefin is passed through a layer of solid, acidic catalysts which is held in a fixed position, with the proviso that no visible liquid phase is formed in this layer.

    48.
    发明专利
    未知

    公开(公告)号:DE4339269A1

    公开(公告)日:1995-05-24

    申请号:DE4339269

    申请日:1993-11-18

    Applicant: BASF AG

    Abstract: PCT No. PCT/EP94/03683 Sec. 371 Date May 16, 1996 Sec. 102(e) Date May 16, 1996 PCT Filed Nov. 9, 1994 PCT Pub. No. WO95/14010 PCT Pub. Date May 26, 1995A process for the preparation of gamma -butyrolactone, in which 2,5-dihydrofuran or 2,3-dihydrofuran or a mixture of these two dihydrofurans is caused to react in the gas phase in the presence of water and in the presence or absence of additional hydrogen at elevated temperature over a hydrogenating catalyst.

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