利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

641 条记录 (耗时 0.019 秒)

    Preparation of trifluoromethyltoluene from halomethylbenzotrifluoride
    82.
    发明授权
    Preparation of trifluoromethyltoluene from halomethylbenzotrifluoride 失效
    由卤代甲基三氟甲苯制备三氟甲基甲苯

    公开(公告)号：US4849557A

    公开(公告)日：1989-07-18

    申请号：US193061

    申请日：1988-05-12

    申请人： Takeshi Kondo ,  Junji Negishi ,  Yoshihiko Goto ,  Matsue Minezaki ,  Toshikazu Kawai

    发明人： Takeshi Kondo ,  Junji Negishi ,  Yoshihiko Goto ,  Matsue Minezaki ,  Toshikazu Kawai

    IPC分类号： C07C17/23 ,  C07C17/38 ,  C07C22/08

    CPC分类号： C07C22/08 ,  C07C17/23 ,  C07C17/38

    摘要： Trifluoromethyltoluene is obtained from a halomethylbenzotrifluoride, which is a relatively inexpensive material, by hydrogenating the halomethyl group of the starting compound to methyl group with hydrogen gas in the presence of a hydrogenation catalyst and an acid acceptor. Suitable examples of the halomethyl group to be hydrogenated are --CH.sub.2 Cl, --CH.sub.2 F, --CHClF, --CClF.sub.2 and --CF.sub.3. When the starting compound is bis(trifluromethyl)benzene, addition of either an alcohol or an alkali metal fluoride to the reaction system is effective for suppression of formation of xylene as a by-product, and xylene still contained in the reaction product can completely be removed by treatment with a sulfonating agent such as fuming sulfuric acid.

    摘要翻译： 通过在氢化催化剂和酸受体的存在下，用氢气将起始化合物的卤代甲基氢化成甲基，由相对便宜的卤代甲基三氟甲苯得到三氟甲基甲苯。 待氢化的卤代甲基的合适实例是-CH 2 Cl，-CH 2 F，-CHClF，-CClF 2和-CF 3。 当起始化合物为双（三氟甲基）苯时，向反应体系中加入醇或碱金属氟化物对于抑制作为副产物形成二甲苯是有效的，反应产物中仍含有的二甲苯可以完全 通过用磺化剂如发烟硫酸处理除去。

    Process for purifying 2-perfluoroalkylethanols
    84.
    发明授权
    Process for purifying 2-perfluoroalkylethanols 失效
    纯化2-全氟烷基乙醇的方法

    公开(公告)号：US4618731A

    公开(公告)日：1986-10-21

    申请号：US800007

    申请日：1985-11-20

    申请人： Leonard H. Beck

    发明人： Leonard H. Beck

    IPC分类号： C07C29/12 ,  C07C17/23 ,  C07C17/25 ,  C07C29/88 ,  C07C31/38 ,  C07C45/29 ,  C07C29/74

    CPC分类号： C07C17/25 ,  C07C17/23 ,  C07C29/88 ,  C07C45/29

    摘要： R.sub.f CH.sub.2 CH.sub.2 I and R.sub.f I present in sufficient quantities so as to cause discoloration of R.sub.f CH.sub.2 CH.sub.2 OH or products made from it are reacted with an excess of an aqueous alkali metal hydroxide and a C.sub.1 -C.sub.3 alcohol in a closed vessel at a temperature above 80.degree. C. until neither of said iodides can be detected in said final product. NaOH and isopropanol at 100.degree.-115.degree. C. are preferred.

    摘要翻译： RfCH 2 CH 2 I和RfI的存在量足以使RfCH 2 CH 2 OH变色或由其制成的产物在过度的80℃以上的封闭容器中与过量的碱金属氢氧化物和C1-C3醇反应，直到 的所述碘化物可以在所述最终产物中检测。 NaOH和异丙醇在100-115℃是优选的。

    Process for producing chlorotrifluoroethylene
    87.
    发明授权
    Process for producing chlorotrifluoroethylene 失效
    氯三氟乙烯生产工艺

    公开(公告)号：US4226812A

    公开(公告)日：1980-10-07

    申请号：US854919

    申请日：1977-11-25

    申请人： Wim J. M. Pieters ,  William E. Gates ,  Franz Wenger

    发明人： Wim J. M. Pieters ,  William E. Gates ,  Franz Wenger

    IPC分类号： C07C17/23 ,  C07C21/18 ,  B01J27/00 ,  C07C19/045 ,  C07C21/06

    CPC分类号： C07C17/23

    摘要： An improved process is described for producing chlorotrifluoroethylene, a useful monomer for making high strength chlorofluoropolymers, comprising passing a mixture of 1,1,2-trichloro-1,2,2-trifluoroethane, ethylene, hydrogen chloride and elemental oxygen in the vapor phase, at a temperature from about 350.degree. to 525.degree. C., over a catalyst consisting essentially of a mixture of copper chloride and an alkali metal chloride, preferably a eutectic mixture, occluded in a molecular sieve, having an average pore size diameter in the range of about 5 to 11 angstroms.A new catalyst composition is also described, useful in oxyhydrochlorination processes conducted at temperatures above 350.degree. C., consisting essentially of a mixture of copper chloride and an alkali metal chloride, preferably a eutectic mixture, occluded in a molecular sieve, having an average pore size diameter in the range of about 5 to 11 angstroms.

    摘要翻译： 描述了一种用于制备氯三氟乙烯（一种用于制备高强度氯氟聚合物的有用单体）的改进方法，其包括使气相中的1,1,2-三氯-1,2,2-三氟乙烷，乙烯，氯化氢和元素氧的混合物 在大约350℃至525℃的温度下，在基本上由氯化铜和碱金属氯化物的混合物组成的催化剂，优选共晶混合物，封闭在分子筛中，其平均孔径直径在 范围约5至11埃。 还描述了一种新的催化剂组合物，其用于在高于350℃的温度下进行的氧化氢氯化方法，其基本上由氯化铜和碱金属氯化物，优选共晶混合物的混合物组成，其被吸留在分子筛中，具有平均孔 尺寸直径在约5至11埃的范围内。

    Selective reduction of chlorofluorobenzenes
    89.
    发明授权
    Selective reduction of chlorofluorobenzenes 失效
    选择性还原氯化硼

    公开(公告)号：US3876711A

    公开(公告)日：1975-04-08

    申请号：US34615973

    申请日：1973-03-29

    申请人： DU PONT

    发明人： HERKES FRANK E

    IPC分类号： C07C17/23 ,  C07C25/00

    CPC分类号： C07C17/23 ,  C07C25/13

    摘要： Halogen in chlorofluorobenzenes can be selectively replaced by hydrogen by reduction with aluminum hydride compounds. Lithium aluminum hydride, lithium diethoxy aluminum hydride and sodium bis(2-methoxyethoxy)aluminum hydride selectively replace fluorine with hydrogen. Sodium diethyl aluminum hydride in hydrocarbon solvents at -20.degree. to 30.degree. C selectively replaces chlorine. At higher temperatures and in ether solvents fluorine is selectively replaced. The reduction products, especially the monohydro products, are useful as working fluids in Rankine-cycle engines.