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    ESTERIFICACION DE ACIDO (MET)ACRILICO CON UN ALCANOL.
    71.
    发明专利
    ESTERIFICACION DE ACIDO (MET)ACRILICO CON UN ALCANOL. 未知

    公开(公告)号：MX9604041A

    公开(公告)日：1997-03-29

    申请号：MX9604041

    申请日：1996-09-12

    Applicant: BASF AG

    Inventor： AICHINGER HEINRICH ,  GEISENDORFER MATTHIAS ,  HERBST HOLGER ,  NESTLER GERHARD

    IPC: C07C27/02 ,  C07C67/08 ,  C07C67/327 ,  C07C67/60 ,  C07C69/54

    Abstract: En un procedimiento para esterificar ácido (met)acrílico con un alcanol en presencia de un catalizador de esterificacion ácido, en donde compuestos iniciales no convertidos y los (met)acrilatos a formar se separan mediante destilacion y se forma un producto de fondo que contiene oxiésteres, el producto de fondo se separa y se calienta en presencia de un ácido a una temperatura de 150-250 degree C, y se ajusta la presion de tal manera que los productos de disociacion formado bajo las condiciones antes mencionadas a partir de los oxiésteres contenidos en el producto de fondo se evaporen directamente. El procedimiento puede realizarse en presencia de oxígeno molecular. Acidos minerales, por ejemplo ácido sulfurico o ácido fosforico y/o ácidos alcansulfonico o arilsulfonico, por ejemplo, ácido metansulfonico o ácido p-toluensulfonico, pueden agregarse al producto de fondo.

    73.
    发明专利
    未知

    公开(公告)号：DE59812096D1

    公开(公告)日：2004-11-11

    申请号：DE59812096

    申请日：1998-07-23

    Applicant: BASF AG

    Inventor： AICHINGER HEINRICH ,  HERBST HOLGER ,  NESTLER GERHARD

    IPC: C07C67/62 ,  C07C69/54 ,  C09K15/18 ,  C09K15/30

    Abstract: A method is described of stabilizing (meth)acrylic esters against unwanted free-radical polymerization, in which the mixture to be stabilized has added to it a polymerization inhibitor mixture comprising at least one nitroxyl radical and/or at least one organic compound having at least one nitroso group, and at least one p-phenylenediamine.

    PREPARATION OF (METH)ACRYLIC ACID.
    74.
    发明专利
    PREPARATION OF (METH)ACRYLIC ACID. 未知

    公开(公告)号：MY118159A

    公开(公告)日：2004-09-30

    申请号：MYPI9804823

    申请日：1998-10-22

    Applicant: BASF AG

    Inventor： NESTLER GERHARD ,  HERBST HOLGER ,  HAMMON ULRICH DR

    IPC: C07C51/25 ,  C07C51/44 ,  C07C51/48 ,  C07C51/50 ,  C07C57/04 ,  C07C57/055 ,  C07C57/07 ,  C07C57/075

    Abstract: IN A PROCESS FOR THE PREPARATION OF (METH)ACRYLIC ACID FROM A MIXTURE WHICH CONTAINS (METH)ACRYLIC ACID AND A SOLVENT HAVING A BOILING POINT ABOVE THE BOILING POINT OF (METH)ACRYLIC ACID BY DISTILLATION OF THE MIXTURE IN A COLUMN WHICH IS CONNECTED TO AN EVAPORATOR AND HAS A STRIPPING SECTION AND A RECTIFYING SECTION, BETWEEN WHICH THE MIXTURE IS FED IN, AND A SIDE TAKE-OFF FOR THE (METH)ACRYLIC ACID, A POLYMERIZATIONINHIBITOR IS FED INTO THE COLUMN IN THE REGION OF THE TOP OF THE COLUMN AND IN THE REGION OF THE SIDE TAKE-OFF, THAT AMOUNT OF POLYMERIZATION INHIBITOR WHICH IS INTRODUCED IN THE REGION OF THE TOP OF THE COLUMN BEING SMALLER THAN THE AMOUNT INTRODUCED IN THE REGION OF THE SIDE TAKE-OFF.

    75.
    发明专利
    未知

    公开(公告)号：DE59608597D1

    公开(公告)日：2002-02-21

    申请号：DE59608597

    申请日：1996-03-15

    Applicant: BASF AG

    Inventor： KOCH ANDREAS ,  AUMUELLER ALEXANDER ,  MITULLA KONRAD ,  TREMMEL GREGOR ,  HERBST HOLGER

    IPC: C07D211/58 ,  C07B63/04 ,  C07D211/94 ,  C07F9/59 ,  C09K15/22 ,  C09K15/30

    Abstract: PCT No. PCT/EP96/01122 Sec. 371 Date Sep. 22, 1997 Sec. 102(e) Date Sep. 22, 1997 PCT Filed Mar. 15, 1996 PCT Pub. No. WO96/29311 PCT Pub. Date Sep. 26, 19964-Acylaminopiperidine N-oxides IaA1B1(Ia)where A1 is hydrogen or an organic radical and B1 is a radical IIa where R1-R4 are each C1-C4-alkyl and R1 and R2, on the one hand, and R3 and R4, on the other hand, may furthermore be bonded to form a 5-membered or 6-membered ring, R5 is H or C114 C4-alkyl and R6 is H or C1-C18-alkyl, are used for stabilizing organic materials against the harmful effect of free radicals, particularly in the distillation of monomers which undergo free radical polymerization, especially styrene.

    Chemical liquid mixing tank has mixer baffle vanes positioned between surface of fluid at rest and crest of fluid under mixing conditions
    79.
    发明专利
    Chemical liquid mixing tank has mixer baffle vanes positioned between surface of fluid at rest and crest of fluid under mixing conditions 未知

    公开(公告)号：DE19957817A1

    公开(公告)日：2001-06-07

    申请号：DE19957817

    申请日：1999-12-01

    Applicant: BASF AG

    Inventor： HERBST HOLGER

    IPC: B01F7/16

    Abstract: An essentially upright circular mixing tank (1) holds a charge of two or more fluids which are agitated by a central mixer (2), setting up a down-flow at the center which is reversed at the base, rising up the tank inner walls. The motion creates a trumpet-shaped center depression in the fluid surface. An essentially upright circular mixing tank (1) holds a charge of two or more fluids which are agitated by a central mixer (2), setting up a down-flow at the center which is reversed at the base, rising up the tank inner walls. The motion creates a trumpet-shaped center depression in the fluid surface. The sidewalls have especially a number of radial baffle vanes (3) between the surface of the liquid at rest and the crest of the liquid under mixing conditions, redirecting some of the flow of liquid downwards towards the tank center. The baffle vanes are at regular intervals around the wall and spaced to minimize mutual interference in the fluid flow. Each baffle redirects flow at an angle of approximately 20 deg downwards from the horizontal. The vanes are fixed to a ring clamp which is height-adjustable on upright rods within the tank. The tank has preferably a cambered cone on the base center promoting reversal of the down-flow at the center.

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