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    81.
    发明专利
    未知

    公开(公告)号：DE59207706D1

    公开(公告)日：1997-01-30

    申请号：DE59207706

    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.

    84.
    发明专利
    未知

    公开(公告)号：DE19501326A1

    公开(公告)日：1996-07-25

    申请号：DE19501326

    申请日：1995-01-18

    Applicant: BASF AG

    Inventor： HERBST HOLGER DR ,  HAMMON ULRICH DR

    IPC: C07C51/44 ,  C07C57/04 ,  C07C57/07

    Abstract: In the sepn. of (meth)acrylic acid (I) from mixts. contg. (I) as main prod. and lower aldehydes as by-prods. by rectification in a column with a distn. zone and a concn. zone, the mixt. is not supplied to the column directly. Instead, it is passed to a heated dwell vessel connected to the concn. zone, in which the mixt. is kept boiling, and the sump liquid from this vessel is fed to the column.

    ACROLEIN CATALYTIC OXIDATION PROCESS TO ACRYLIC ACID IN A GASEOUS PHASE
    86.
    发明专利
    ACROLEIN CATALYTIC OXIDATION PROCESS TO ACRYLIC ACID IN A GASEOUS PHASE 未知

    公开(公告)号：CZ229495A3

    公开(公告)日：1996-03-13

    申请号：CZ229495

    申请日：1995-09-07

    Applicant: BASF AG

    Inventor： RUPPEL WILHELM DR ,  WEGERLE ULRIKE ,  TENTEN ANDREAS DR ,  HAMMON ULRICH DR

    IPC: B01J23/28 ,  B01J8/06 ,  B01J21/02 ,  B01J23/16 ,  C07B61/00 ,  C07C51/25 ,  C07C57/04 ,  C07C57/055

    Abstract: A process for the catalytic gas-phase oxidation of acrolein to acrylic acid in a multiple contact tube fixed-bed reactor through whose space surrounding the contact tubes only one heat-exchange medium circuit is passed, at elevated temperature on catalytically active multimetal oxides with an acrolein conversion for a single pass of >/=95 mol % and an acrylic acid formation selectivity of >/=90 mol %, which comprises firstly passing the heat-exchange medium through the multiple contact tube fixed-bed reactor longitudinally, considered over the reaction container as a whole, to the contact tubes in cocurrent to the reaction-gas mixture and secondly superposing a transverse flow within the reaction container by means of an arrangement of successive baffles along the contact tubes which leaves passage cross sections free, so as to give a meandrous flow of the heat-exchange medium, seen in longitudinal section through the contact tube bundle, and setting the flow rate of the circulated heat-exchange medium so that its temperature rises by from 2 DEG to 10 DEG C. between the point of entry into the reactor and the point of exit out of the reactor.

    87.
    发明专利
    未知

    公开(公告)号：DE59202609D1

    公开(公告)日：1995-07-27

    申请号：DE59202609

    申请日：1992-09-21

    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 for the catalytic gas-phase oxidation of propene to acrolein
    88.
    发明专利
    Process for the catalytic gas-phase oxidation of propene to acrolein 未知

    公开(公告)号：DE4431957A1

    公开(公告)日：1995-03-16

    申请号：DE4431957

    申请日：1994-09-08

    Applicant: BASF AG

    Inventor： RUPPEL WILHELM DR ,  WEGERLE ULRIKE ,  TENTEN ANDREAS DR ,  HAMMON ULRICH DR

    IPC: B01J23/88 ,  B01J8/06 ,  B01J21/02 ,  B01J23/16 ,  B01J23/887 ,  B01J27/132 ,  B01J27/192 ,  C07B61/00 ,  C07C45/35 ,  C07C47/22

    Abstract: A process for the catalytic gas-phase oxidation of propene to acrolein in a multiple contact tube fixed-bed reactor, with only one heat transfer medium being circulated through the space surrounding the contact tubes, at elevated temperature over catalytically active multimetal oxides at a propene conversion on a single pass of >/= 90 mol% and a selectivity of acrolein formation of >/= 85 mol%, in which the heat exchange medium on the one hand is passed longitudinally, viewed over the reaction vessel, to the contact tubes in cocurrent to the reaction gas mixture through the multiple contact tube fixed-bed reactor and, on the other hand, has, within the reaction vessel, due to a successive arrangement, along the contact tubes, of deflecting discs which leave open cross-sections free, a superposed crossflow in such a way that, in longitudinal section through the contact tube bundle, a meander-like flow of the heat exchange medium results and the flow velocity of the circulated heat exchange medium is here set in such a way that the temperature of the heat exchange medium rises by from 2 to 10 DEG C from the inlet point to the reactor to the outlet point from the reactor.

    PROCESS OF CATALYTIC OXIDATION OF METHACROLEIN IN GASEOUS PHASE TO METHACRYLIC ACID
    89.
    发明专利
    PROCESS OF CATALYTIC OXIDATION OF METHACROLEIN IN GASEOUS PHASE TO METHACRYLIC ACID 未知

    公开(公告)号：CZ297492A3

    公开(公告)日：1993-04-14

    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.

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