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    3.
    发明专利
    未知

    公开(公告)号：DE4132684A1

    公开(公告)日：1993-04-08

    申请号：DE4132684

    申请日：1991-10-01

    Applicant: BASF AG

    Inventor： HAMMON ULRICH DR ,  HERZOG KLAUS DR ,  NEUMANN HANS-PETER DR

    IPC: C07C51/235 ,  B01J27/186 ,  B01J27/188 ,  B01J27/19 ,  B01J27/195 ,  B01J27/199 ,  C07C51/25 ,  C07C57/04 ,  C07C57/055

    Abstract: A process for the catalytic gas-phase oxidation of methacrolein to methacrylic acid in a fixed-bed reactor with contacting tubes, at elevated temperature on catalytically active oxides with a conversion of methacrolein for a single pass of from 40 to 95 mol%, wherein the reaction temperature in the flow direction along the contacting tubes in a first reaction zone from entry of the starting reaction gases containing the reactants into the contacting tubes is from 280 to 340 DEG C. until a methacrolein conversion of from 20 to 40% is reached, and the reaction temperature is subsequently reduced by a total of from 5 DEG to 40 DEG C., abruptly or successively in steps or continuously along the contacting tubes until a methacrolein conversion of from 45 to 95% has been reached, with the proviso that the reaction temperature in this second reaction zone is not lower than 260 DEG C.

    PROCESS OF CATALYTIC OXIDATION OF METHACROLEIN TO METHACRYLIC ACID IN GASEOUS PHASE
    6.
    发明专利
    PROCESS OF CATALYTIC OXIDATION OF METHACROLEIN TO METHACRYLIC ACID IN GASEOUS PHASE 未知

    公开(公告)号：CZ281911B6

    公开(公告)日：1997-03-12

    申请号：CS297492

    申请日：1992-09-29

    Applicant: BASF AG

    Inventor： HAMMON ULRICH DR ,  HERZOG KLAUS DR ,  NEUMANN HANS-PETER DR

    IPC: C07C51/235 ,  B01J27/186 ,  B01J27/188 ,  B01J27/19 ,  B01J27/195 ,  B01J27/199 ,  C07C51/25 ,  C07C57/04 ,  C07C57/055

    Abstract: A process for the catalytic gas-phase oxidation of methacrolein to methacrylic acid in a fixed-bed reactor with contacting tubes, at elevated temperature on catalytically active oxides with a conversion of methacrolein for a single pass of from 40 to 95 mol%, wherein the reaction temperature in the flow direction along the contacting tubes in a first reaction zone from entry of the starting reaction gases containing the reactants into the contacting tubes is from 280 to 340 DEG C. until a methacrolein conversion of from 20 to 40% is reached, and the reaction temperature is subsequently reduced by a total of from 5 DEG to 40 DEG C., abruptly or successively in steps or continuously along the contacting tubes until a methacrolein conversion of from 45 to 95% has been reached, with the proviso that the reaction temperature in this second reaction zone is not lower than 260 DEG C.

    7.
    发明专利
    未知

    公开(公告)号：ES2094862T3

    公开(公告)日：1997-02-01

    申请号：ES92115799

    申请日：1992-09-16

    Applicant: BASF AG

    Inventor： HAMMON ULRICH DR ,  HERZOG KLAUS DR ,  NEUMANN HANS-PETER DR

    IPC: C07C51/235 ,  C07C51/25 ,  C07C57/055

    Abstract: A method for the catalytic gas-phase oxidation of acrolein to acrylic acid in a contact tubular solid bed reactor at elevated temperature on catalytically active oxides with a conversion of the acrolein on a single pass of >/= 95%, in which the reaction temperature in the flow direction along the contact tube in a first reaction zone from entry of the exit reaction gases containing the reactants into the contact tube until a conversion of the acrolein of 20 to 40% is achieved is 260 to 300 DEG C and in which subsequently thereto the reaction temperature is decreased abruptly or in successive steps or continuously along the contact tube until an acrolein conversion of >/= 95% is achieved by a total of 5 to 40 DEG C with the proviso that the reaction temperature in this second reaction zone is not less than 240 DEG C.

    10.
    发明专利
    未知

    公开(公告)号：DE4241942A1

    公开(公告)日：1994-06-16

    申请号：DE4241942

    申请日：1992-12-11

    Applicant: BASF AG

    Inventor： BOECK STEFAN DR ,  HERZOG KLAUS DR ,  FISCHER ROLF DR ,  VOGEL HERBERT DR ,  FISCHER MARTIN DR

    IPC: C07D301/10 ,  B01J23/50 ,  B01J23/96 ,  B01J38/12 ,  B01J38/16 ,  C07D303/04

    Abstract: PCT No. PCT/EP93/03352 Sec. 371 Date Mar. 17, 1995 Sec. 102(e) Date Mar. 17, 1995 PCT Filed Nov. 30, 1993 PCT Pub. No. WO94/13653 PCT Pub. Date Jun. 23, 19943,4-Epoxy-1-butene is prepared by the gas phase epoxidation of 1,3-butadiene by means of oxygen or oxygen-containing gases over silver-containing catalysts and isolation of the 3,4-epoxy-1-butene from the reaction exit mixture by performing the gas phase epoxidation in the presence of from 6 to 80 mol % of water vapor, based on the gas mixture supplied to the reactor.

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