MALEIC ANHYDRIDE/ALKYL VINYL ETHER POLYMERIZATION PROCESS
    3.
    发明授权
    MALEIC ANHYDRIDE/ALKYL VINYL ETHER POLYMERIZATION PROCESS 失效
    马来酸酐/烷基乙烯基醚POLYMERISIERUNGVERFAHREN。

    公开(公告)号:EP0542758B1

    公开(公告)日:1995-11-29

    申请号:EP91912312.5

    申请日:1991-07-11

    CPC分类号: C08F216/18 C08F222/06

    摘要: What is described herein is a process for making a copolymer of high specific viscosity by polymerisation of maleic anhydride and a C1-C4 alkyl vinyl ether monomer. The invention involves polymerizing said monomers to form a slurry of said copolymer in excess alkyl vinyl ether as solvent and toluene or an aliphatic organic compound as cosolvent, and is characterized by the steps of: (a) precharging a reactor with C1-C4 alkyl vinyl ether as solvent at a reaction temperature, (b) feeding a mixture of maleic anhydride and a C1-C4 alkyl vinyl ether in substantially stoichiometric amounts, preferably with a slight excess of the alkyl vinyl ether, and at a selected rate, into said precharged reactor, and (c) simultaneously feeding a predetermined mixture of toluene or an aliphatic organic compound and a polymerization initiator continuously over substantially the entire period of polymerization.

    BENZENE-FREE MALEIC ANHYDRIDE/VINYL ETHER POLYMERS
    4.
    发明公开
    BENZENE-FREE MALEIC ANHYDRIDE/VINYL ETHER POLYMERS 失效
    苯FREE马来酸酐/乙烯基醚POLEMERE。

    公开(公告)号:EP0593565A1

    公开(公告)日:1994-04-27

    申请号:EP92914152.0

    申请日:1992-06-17

    CPC分类号: C08F222/06 C08F216/18

    摘要: Procédé de production d'un polymère d'éther vinylique d'alkyle inférieur/d'anhydride maléique dépourvu de benzène et présentant une viscosité spécifique comprise entre 1,0 et 5,5 environ, et qui consiste à prémélanger l'anhydride maléique et l'éther vinylique d'alkyle en un rapport molaire compris entre environ 1:1,1 et environ 1:2, dans un mélange de co-solvants constitué de benzène substitué par alkyle inférieur, d'un alcane C6-8, d'un éther d'alkyle inférieur saturé, avec un éther vinylique d'alkyle inférieur comme co-solvant, et à mettre en réaction le mélange monomère transformé en complexe à une température et une pression élevées et en contact continu avec une amorce peroxyde. La viscosité spécifique est régulée lorsqu'on ajuste la quantité d'éther vinylique d'alkyle inférieur dans le mélange de co-solvants. Le produit polymère est récupéré de la bouillie obtenue par séchage sous vide.

    A METHOD FOR PREVENTING OR RETARDING THE FORMATION OF GAS HYDRATES
    5.
    发明公开
    A METHOD FOR PREVENTING OR RETARDING THE FORMATION OF GAS HYDRATES 无效
    的一种方法,以防止或气体水合物的抑制

    公开(公告)号:EP0946470A1

    公开(公告)日:1999-10-06

    申请号:EP97910068.0

    申请日:1997-10-06

    IPC分类号: C07C7 C07C9 C09K8 C10L1 C10L3

    摘要: A composition for preventing or retarding the formation of gas hydrates or for reducing the tendency of gas hydrates to agglomerate, during the transport of a fluid comprising water and a hydrocarbon, through a conduit, comprising, (a) a polymer or copolymer selected from a terpolymer of vinyl pyrrolidone, vinyl caprolactam and an ammonium derivative monomer having from 6 to 12 carbon atoms, selected from the group consisting of dialkyl aminoalkyl methacrylamide, dialkyl dialkenyl ammonium halide and a dialkylamino alkyl acrylate or methacrylate, a copolymer of vinyl pyrrolidone and vinyl caprolactam, and a homopolymer of vinyl caprolactam, and (b) an alcohol containing three to five carbon atoms and one hydroxy group, or a low molecular weight glycol ether containing an alkoxy group having at least 3 carbon atoms.

    MALEIC ANHYDRIDE/ALKYL VINYL ETHER POLYMERIZATION PROCESS
    6.
    发明公开
    MALEIC ANHYDRIDE/ALKYL VINYL ETHER POLYMERIZATION PROCESS 失效
    马来酸酐/烷基乙烯基醚POLYMERISIERUNGVERFAHREN。

    公开(公告)号:EP0542758A1

    公开(公告)日:1993-05-26

    申请号:EP91912312.0

    申请日:1991-07-11

    IPC分类号: C08F16 C08F20 C08F216 C08F222 C08L29

    CPC分类号: C08F216/18 C08F222/06

    摘要: On décrit un procédé de fabrication d'un copolymère présentant une viscosité spécifique élevée, par polymérisation d'anhydride maléique et d'un monomère d'éther vinyl-alkyle C1-C4. L'invention consiste à polymériser lesdits monomères pour former une pâte dudit copolymère dans un excédent d'éther vinyl-alkyle comme solvant et du toluène ou un composé organique aliphatique comme co-solvant et se caractérise par les étapes suivantes: a) précharger un réacteur avec de l'éther vinyl-alkyle C1-C4 comme solvant à une température de réaction, b) alimenter ledit réacteur préchargé en un mélange d'anhydride maléique et d'un éther vinyl-alkyle C1-C4 en quantités pratiquement stoechiométriques, de préférence avec un léger excédent d'éther vinyl-alkyle, et à une vitesse choisie, et c) alimenter le réacteur simultanément et continuellement en un mélange prédéterminé de toluène ou d'un composé organique aliphatique et d'une substance amorçant la polymérisation pendant pratiquement toute la durée de la polymérisation.

    PROCESS FOR THE PRODUCTION OF PURE VINYL PYRROLIDONE
    7.
    发明授权
    PROCESS FOR THE PRODUCTION OF PURE VINYL PYRROLIDONE 失效
    用于生产纯乙烯基吡咯烷酮

    公开(公告)号:EP0682653B1

    公开(公告)日:1999-04-07

    申请号:EP94906709.4

    申请日:1994-01-21

    IPC分类号: C07D207/267 C07D207/26

    CPC分类号: C07D207/267

    摘要: This invention relates to a process for the purification of a crude liquid N-vinylpyrrolidone product which comprises (I) product rectification by (a) subjecting said crude product containing at least 0.3 weight % of impurities to a temperature of between about 1° and 5° below the freezing point of said crude liquid to form a vinyl pyrrolidone crystalline phase and a liquid residue phase in a first crystallization step; (b) separating said liquid phase from said crystalline phase; (c) allowing said separated crystalline phase to warm gradually so as to liquify said crystals and (d) subjecting the liquified crystals of vinyl pyrrolidone to between 1 and 3 additional crystallization steps, each carried out by gradually cooling the liquified vinyl pyrrolidone to a temperature above that of the preceding crystallization step up to a temperature of 14.4 °C so as to form additional vinyl pyrrolidone crystalline and liquid residue phases with separation of vinyl pyrrolidone crystals and liquid residue phases and liquification of vinyl pyrrolidone crystals between each additional recrystallization step, recovery of N-vinyl-pyrrolidone product from the final crystallization step and (II) collecting said separated liquid residues from each crystallization step and subjecting them, sequentially, individually or collectively, to fractional crystallization in order to recover additional amounts of purified vinyl pyrrolidone product. The present process is capable of achieving up to 99.999 % purity of vinyl pyrrolidone in about 98 % recovery.

    PROCESS FOR THE PRODUCTION OF PURE VINYL PYRROLIDONE
    9.
    发明公开
    PROCESS FOR THE PRODUCTION OF PURE VINYL PYRROLIDONE 失效
    用于生产纯乙烯基吡咯烷酮。

    公开(公告)号:EP0682653A1

    公开(公告)日:1995-11-22

    申请号:EP94906709.0

    申请日:1994-01-21

    IPC分类号: C07D207

    CPC分类号: C07D207/267

    摘要: This invention relates to a process for the purification of a crude liquid N-vinylpyrrolidone product which comprises (I) product rectification by (a) subjecting said crude product containing at least 0.3 weight % of impurities to a temperature of between about 1° and 5° below the freezing point of said crude liquid to form a vinyl pyrrolidone crystalline phase and a liquid residue phase in a first crystallization step; (b) separating said liquid phase from said crystalline phase; (c) allowing said separated crystalline phase to warm gradually so as to liquify said crystals and (d) subjecting the liquified crystals of vinyl pyrrolidone to between 1 and 3 additional crystallization steps, each carried out by gradually cooling the liquified vinyl pyrrolidone to a temperature above that of the preceding crystallization step up to a temperature of 14.4 °C so as to form additional vinyl pyrrolidone crystalline and liquid residue phases with separation of vinyl pyrrolidone crystals and liquid residue phases and liquification of vinyl pyrrolidone crystals between each additional recrystallization step, recovery of N-vinyl-pyrrolidone product from the final crystallization step and (II) collecting said separated liquid residues from each crystallization step and subjecting them, sequentially, individually or collectively, to fractional crystallization in order to recover additional amounts of purified vinyl pyrrolidone product. The present process is capable of achieving up to 99.999 % purity of vinyl pyrrolidone in about 98 % recovery.