PROCESS FOR PREPARING LOW-MOLECULAR ETHYLENE POLYMERS UNDER HIGH PRESSURE

    公开(公告)号:CA2253256A1

    公开(公告)日:1997-11-06

    申请号:CA2253256

    申请日:1997-04-24

    Applicant: BASF AG

    Abstract: A process is disclosed for preparing ethylene polymers with a molecular weight Mw (weight average) lower than 20,000 g/mole at temperatures in a range from 200 to 280 ~C and pressures in a range from 1000 to 3500 bars in the presence of a catalyst system. The catalyst system used contains: (A) a non-bridged substituted or unsubstituted biscyclopentadienyl complex; (B) a metal compound of general formula (I) M1 (R1)r (R2)s (R3)t, in which M1 is an alkaline, an alkaline earth metal or a metal of the third main group of the periodic table; R1 is hydrogen, C1-C10-alkyl, C6-C15-aryl, alkylaryl or arylalkyl with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical; R2 and R3 independently represent hydrogen, halogen, C1-C10-alkyl, C6-C15-aryl, alkylaryl, arylalkyl or alkoxy with 1 to 10 C atoms in the alkyl radical and 6 to 20 C atoms in the aryl radical; r is an integer from 1 to 3; and s and t are integers from 0 to 2, the sum r+s+t corresponding to the valency of M1; and (C) a metallocene ion-forming compound selected in a group which consists of strong, neutral Lewis acids, ionic compounds with lewis acid cations and ionic compounds with Brönsted acids as cations. Components (A), (B) and (C) are mixed together and after at the latest 5 minutes are dosed in the reactor.

    PROCESO MEJORADO PARA LA PREPARACION DE ACIDO CIANHIDRICO

    公开(公告)号:PE07892008A1

    公开(公告)日:2008-08-23

    申请号:PE0011932007

    申请日:2007-09-06

    Applicant: BASF AG

    CPC classification number: C01C3/0204

    Abstract: QUE COMPRENDE: a) LA DESHIDRATACION CATALITICA DE FORMAMIDA GASEOSA EN UN REACTOR, CON PRESENCIA DE OXIGENO ATMOSFERICO Y A UNA TEMPERATURA DE 350 A 650°C Y UNA PRESION DE 70 A 350 mbar, QUE TIENE UN INTERCAMBIADOR DE CALOR CORRIENTE ABAJO CON SUPERFICIES DE CONDENSACION PARA OBTENER UNA MEZCLA DE PRODUCTO QUE COMPRENDE ACIDO CIANHIDRICO, AGUA, FORMAMIDA, AMONIACO, CO Y PRODUCTOS DE ALTO PUNTO DE EBULLICION; b) LA CONDENSACION PARCIAL DE UNA FASE LIQUIDA QUE COMPRENDE FORMAMIDA Y AGUA DE LA MEZCLA DEL PRODUCTO, AL ENFRIAR LA MEZCLA DE PRODUCTO FORMADA EN (i) A UNA TEMPERATURA DE 10 A 450°C; Y, iii) LA RECIRCULACION CONSTANTE DE UNA PARTE DEL LIQUIDO CONDENSADO EN EL EXTERIOR Y BOMBEO DE DICHO LIQUIDO NUEVAMENTE HACIA DICHAS SUPERFICIES. LA TOTALIDAD DE LA SUPERFICIE DE CONDENSACION CORRIENTE ABAJO ES CONTINUAMENTE HUMEDECIDA CON LIQUIDOS. CUERPOS DE FORMA ALTAMENTE AGLUTINADOS COMPUESTOS POR ENTRE 50 Y 100% EN PESO DE OXIDO DE ALUMINIO Y ENTRE 0 Y 50% EN PESO DE DIOXIDO DE SILICIO, CUERPOS CON FORMA DE ACERO INOXIDABLE DE Cr-Ni, PAQUETES QUE COMPRENDEN OXIDO DE HIERRO Y/O ACERO EN UN MATERIAL DE SOPORTE; SE EMPLEAN COMO CATALIZADORES EN (i), Y/O EN DONDE EL LADO INTERIOR DE LA PARED DEL REACTOR ESTA FORMADA POR ACERO Y SIRVE COMO CATALIZADOR

    79.
    发明专利
    未知

    公开(公告)号:AT247137T

    公开(公告)日:2003-08-15

    申请号:AT00929482

    申请日:2000-05-03

    Applicant: BASF AG

    Abstract: Copolymers of ethylene have from 1 to 30 mol % of alkyl(meth)acrylates and, if desired, other comonomers, and have a residual comonomer content of less than 0.5% by weight in the copolymer. A process for preparing copolymers of this type in a combination of stirred autoclave and tubular reactor is described, as is the use of the copolymers for preparing polyamide molding compositions.

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