中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

9 records (took 0.021 seconds)

    Selective removal of oxides of nitrogen from gas mixtures containing oxygen
    3.
    发明专利
    Selective removal of oxides of nitrogen from gas mixtures containing oxygen 未知

    公开(公告)号：GB1074794A

    公开(公告)日：1967-07-05

    申请号：GB4787864

    申请日：1964-10-14

    Applicant: BASF AG

    Inventor： NONNENMACHER HELMUT ,  KARTTE KLAUS

    IPC: B01D53/86

    Abstract: Oxides of nitrogen are selectively removed from gas mixtures containing oxygen by reduction with at least the stoichiometric amount of ammonia in the presence of a catalyst comprising one or more of the oxides of vanadium, molybdenum or tungsten. Preferred oxides are V2O5, MoO3 and WO3. The gas mixture i passed over the catalyst at space velocities of from 3000 to 80,000, preferably from 10,000 to 30,000, parts by volume of gas mixture per hour per part by volume of catalyst, the temperature of the gas mixture prior to reduction and upon admission to the catalyst being between 150 DEG and 400 DEG C., preferably between 200 DEG and 350 DEG C. The catalyst may be a supported catalyst which contains from 2 to 50% by weight of the oxide or oxides and in which the carrier is aluminium oxide, for example alpha-alumina, and/or silicic acid. The catalyst may be prepared by impregnating a moulded carrier one or more times with a solution of a salt containing one or more of the metals, for example, of vanadium oxysulphate, of V2O5 in oxalic acid, or of ammonium molybdate or tungstate, drying and heating in a current of air for several hours at a temperature of from 450 DEG to 600 DEG C. to form the corresponding metal oxide or oxides; the latter may be converted to a lower oxidation state by prolonged heating in a current of hydrogen at a temperature of at least 400 DEG C.

    PURIFICATION OF CAPROLACTAM
    8.
    发明专利
    PURIFICATION OF CAPROLACTAM 未知

    公开(公告)号：CA1138865A

    公开(公告)日：1983-01-04

    申请号：CA354720

    申请日：1980-06-25

    Applicant: BASF AG

    Inventor： FUCHS HUGO ,  GROSSKINSKY OTTO-ALFRED ,  FROMMER ELMAR ,  KARTTE KLAUS

    IPC: C07D201/02 ,  C07D201/16 ,  C07D223/10

    Abstract: A process for purifying caprolactam which has been obtained by Beckmann rearrangement, which process comprises: (a) extracting crude caprolactam with solvents; (b) distilling the extract in the presence of alkali and isolating pure caprolactam; (c) treating the distillation residue from (b) by distilling off caprolactam at a bottom temperature of 130 - 160.degree.C and recycling the caprolactam obtained to distillation stage (b); (d) distilling the residue thus obtained at (c) at a bottom temperature of 140 - 180.degree.C; and (e) treating the distillate obtained in (d) with strongly acidic agents and recycling the treated distillate to extraction stage (a).

Patent Agency Ranking