利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

121 条记录 (耗时 0.016 秒)

    A catalyst component for polymerizing ethylene or copolymerizing ethylene with an alpha-olefin
    2.
    发明公开
    A catalyst component for polymerizing ethylene or copolymerizing ethylene with an alpha-olefin 失效
    乙烯聚合乙烯或丙烯共聚乙烯的催化剂组分

    公开(公告)号：EP0281524A3

    公开(公告)日：1988-09-14

    申请号：EP88830040

    申请日：1988-02-03

    申请人： ENICHEM ANIC S.p.A.

    发明人： Invernizzi, Renzo ,  Moalli, Angelo ,  Masi, Francesco

    IPC分类号： C08F04/64 ,  C08F10/02

    CPC分类号： C08F10/02 ,  C08F4/6555

    摘要： A catalyst component is in the form of a granular spherical solid with at least 80% of the granules between 30 and 40 microns in size, a surface area of 15 to 30 m²/g and a porosity of 40 to 80 volumes % and definable (in atomic proportions) by the formula:
    Ti₁ Mg 0,3-3,1 Al 0,4-0,65 Cl 3,2-8,2
    (Et + OEt + ORʹ) 1,9-3
    where Et denotes the ethyl group; OEt denotes the ethoxy group and ORʹ is an alkoxy group containing from 1 to 8 carbon atoms in the alkyl portion, and in which the ratio of trivalent titanium to the sum of trivalent and tetravalent titanium is in the range from 0.8/1 to 1/1. The solid catalyst component is obtained by:
    a) Spray-drying a solution of magnesium chloride in ethanol to produce a solid substrate in the form of spherical granules containing alcoholic hydroxyl groups, and b) Suspending the solid substrate in an inert liquid and contacting and reacting the resulting suspension firstly with measured quantities of a titanium tetra-alkoxide and then with measured quantities of diethyl aluminium chloride or ethyl aluminium sesquichloride. The solid catalyst component is used in combination with a trialkyl aluminium to polymerize ethylene or to copolymerize ethylene with an alpha-olefin, more particularly by the suspension technique.

    Method of purification of the oxalic acid diamide
    3.
    发明公开
    Method of purification of the oxalic acid diamide 失效
    纯化二氧化氨的方法

    公开(公告)号：EP0245632A3

    公开(公告)日：1988-05-25

    申请号：EP87104676

    申请日：1987-03-30

    申请人： ENICHEM ANIC S.p.A.

    发明人： Lorenzoni, Loreno ,  Dessantis, Nino ,  Virdis, Angelo

    IPC分类号： C07C103/147 ,  C07C102/08

    CPC分类号： C07C235/00

    摘要： A method of removing copper from oxamide obtained through a process which involves the use of copper catalysts, by contacting it with an aqueous solution of a suitable complexing agent, which is capable offorming copper-containing water-soluble complexes and imparts to the aqueous solution a pH comprised between 2 and 8, optionally repeating the contacting step and, finally, recovering the purified oxamide by solid-liquid separation techniques. The claimed process affords oxamide containing less than 25 ppm of copper.

    Process for the preparation of vinyl ethers
    4.
    发明公开
    Process for the preparation of vinyl ethers 失效
    Verfahren zur Herstellung vonVinyläthern。

    公开(公告)号：EP0254976A1

    公开(公告)日：1988-02-03

    申请号：EP87110281.0

    申请日：1987-07-16

    申请人： ENICHEM ANIC S.p.A.

    发明人： Messina, Giuseppe ,  Moretti, Mario Domenico ,  Sanna, Salvatore Roberto ,  Soma, Giovanni ,  Cabras, Pier Gianni

    IPC分类号： C07C43/16 ,  C07C43/166 ,  C07C45/88 ,  C07C41/28

    CPC分类号： C07C41/01 ,  C07C2601/16 ,  C07C43/17 ,  C07C43/188 ,  C07C43/166

    摘要： A process for the synthesis of vinyl ethers of formula I
    wherein
    R₁ and R₂, each independently, represent hydrogen or a primary, secondary or tertiary alkyl group,
    R₃ is hydrogen, a primary alkyl, phenyl, or substituted phenyl group, or
    R₂ and R₃, taken together, represent a polymethylene chain containing from 3 to 10 carbon atoms wherein one or more hydrogens can be replaced by methyl or ethyl groups, and
    R is a primary, secondary or tertiary alkyl group, which comprises reacting a suitably selected dioxolane derivative of formula II
    wherein
    R₁, R₂, and R₃ are as defined above, and
    R₄, R₅, R₆, and R₇, each independently, represent hydrogen or an alkyl group,
    with a boric acid ester of formula III
    B(OR)₃ III
    wherein
    R is as defined above,
    in the vapor phase, at a temperature comprised between 100 and 400 °C, and in the presence of an acidic heterogeneous catalyst.

    摘要翻译： 用于合成式I的乙烯基醚的方法其中R 1和R 2各自独立地表示氢或伯，仲或叔烷基，R 3是氢，伯烷基，苯基或取代的苯基，或 R2和R3一起表示含有3至10个碳原子的多亚甲基链，其中一个或多个氢可以被甲基或乙基代替，并且R是伯，仲或叔烷基，其包括使适当选择的 式II的二氧杂环戊烷衍生物其中R 1，R 2和R 3如上所定义，并且R 4，R 5，R 6和R 7各自独立地代表氢或烷基，与式IIIB的硼酸酯（ OR）3 III，其中R如上所定义，在气相中，在100-400℃的温度下和在酸性多相催化剂存在下。

    A method of preparing low or medium-densitity straight-chain polyethylene
    5.
    发明公开
    A method of preparing low or medium-densitity straight-chain polyethylene 失效
    一种用于低或中密度的直链聚乙烯的制备方法。

    公开(公告)号：EP0243327A1

    公开(公告)日：1987-10-28

    申请号：EP87830149.8

    申请日：1987-04-16

    申请人： ENICHEM ANIC S.p.A.

    发明人： Mirra, Mauro ,  Masi, Francesco ,  Invernizzi, Renzo ,  Bani, Antonio

    IPC分类号： C08F210/02 ,  C08F4/64

    CPC分类号： C08F210/02 ,  Y02P20/52 ,  C08F4/6555

    摘要： ow or medium-density straight-chain ethylene polymers are prepared by copolymerising ethylene with a C 4 -C 6 alpha-olefin at elevated temperature and pressure in a tubular reactor and in the presence of a Ziegler-type catalyst comprising a trialkyl aluminium as co-catalyst and a solid component, the solid component being obtained:

    - by spray-drying an ethanolic solution of magnesium chloride to obtain a solid substrate of magnesium chloride particles containing alcoholic hydroxylis,
    - by reacting the substrate with titanium tetrachloride to form an activated substrate, and
    - by reacting the activated substrate with an alkyl aluminium chloride to chlorinate the titanium and partially or completely reduce the titanium from the tetravelent to the trivalent state.

    摘要翻译： 低或中密度的直链乙烯聚合物是通过在升高的温度下的C 4 -C 6α-烯烃和压力下，在管式反应器，并在齐格勒型催化剂存在下，包括三烷基铝作为助催化剂使乙烯制备 和固体成分，固体成分而得到： - 通过的氯化镁，得到氯化镁颗粒的含醇hydroxylis固体基材的乙醇溶液的喷雾干燥， - 通过用四氯化钛使下基片，以形成活化的基底，和 - 通过与烷基氯化铝起反应的活化的底物，以氯化钛和部分或完全呼叫从tetravelent到三价状态还原钛。