Process for the oxidation of aromatic compounds to hydroxyaromatic
compounds
    81.
    发明授权
    Process for the oxidation of aromatic compounds to hydroxyaromatic compounds 有权
    芳香族化合物氧化成羟基芳族化合物的方法

    公开(公告)号:US6133487A

    公开(公告)日:2000-10-17

    申请号:US176316

    申请日:1998-10-22

    CPC分类号: C07C37/60 C07C41/26 Y02P20/52

    摘要: An improved process is described for the synthesis of hydroxylated aromatic compounds by means of the oxidation of an aromatic substrate with hydrogen, peroxide in an organic solvent, in the presence of synthetic zeolites, wherein the improvement consists in the fact that the organic solvent is selected from compounds having general formula (I) ##STR1## wherein: R.sub.1, R.sub.2, R.sub.3 and R.sub.4, the same or different, represent a hydrogen atom or an alkyl group with from 1 to 4 carbon atoms or from compounds having general formula (II) ##STR2## wherein R and R', the same or different, represent an alkyl radical with from 1 to 4 carbon atoms.

    摘要翻译: 描述了通过在合成沸石存在下,通过在有机溶剂中用氢气,过氧化物氧化芳族底物来合成羟化芳族化合物的改进方法,其中改进在于选择有机溶剂 来自具有通式(I)的化合物,其中:R 1,R 2,R 3和R 4相同或不同,表示氢原子或具有1至4个碳原子的烷基或具有通式(II)的化合物,其中R和 R'相同或不同,表示具有1至4个碳原子的烷基。

    Process for preparing porous spherical silica xerogels
    82.
    发明授权
    Process for preparing porous spherical silica xerogels 失效
    制备多孔球形二氧化硅干凝胶的方法

    公开(公告)号:US6103209A

    公开(公告)日:2000-08-15

    申请号:US628978

    申请日:1996-04-08

    IPC分类号: C04B38/00 C01B33/16 C01B33/12

    CPC分类号: C01B33/163

    摘要: Process for preparing porous spherical silica particles substantially consisting in emulsifying an acidic silica sol in a dispersing media, gelifying the microdrops of the sol in the emulsified state and submitting the resulting gel to thermal treatment in the presence of the emulsifier liquid and of sol gelation base.

    摘要翻译: 制备多孔球状二氧化硅颗粒的方法,其基本上包括在分散介质中乳化酸性二氧化硅溶胶,使乳化状态下的溶胶的微滴凝胶化,并将所得凝胶在乳化剂液体和溶胶凝胶基质存在下进行热处理 。

    Process for the preparation of polycarbonate copolyether polyols
    89.
    发明授权
    Process for the preparation of polycarbonate copolyether polyols 失效
    制备聚碳酸酯共聚醚多元醇的方法

    公开(公告)号:US5847069A

    公开(公告)日:1998-12-08

    申请号:US818899

    申请日:1997-03-17

    申请人: Alberto Greco

    发明人: Alberto Greco

    摘要: A process is described for the preparation of polycarbonate polyether polyols characterized in that dimethylcarbonate (DMC) and one or more polyether diols are reacted at a ratio DMC/polyether diols of between 0.5 and 1.35, at a temperature of between 130.degree. and 175.degree. C. and in the presence of a catalyst consisting of an oxide, a carbonate or an alcoholate of a metal of the first or second group or a salt or organometallic compound of a metal belonging to the third or fourth or fifth group at a concentration of between 0.0001 and 0.01%.

    摘要翻译: 描述了一种制备聚碳酸酯聚醚多元醇的方法,其特征在于在130-175℃的温度下,二甲基碳酸酯(DMC)和一种或多种聚醚二醇以DMC /聚醚二醇的比例在0.5和1.35之间反应 并且在由第一或第二组的金属的氧化物,碳酸盐或醇化物或属于第三或第四或第五组的金属的盐或有机金属化合物的催化剂的存在下, 0.0001和0.01%。

    Process for the production of vinylaromatic polymers with a high degree
of syndiotacticity
    90.
    发明授权
    Process for the production of vinylaromatic polymers with a high degree of syndiotacticity 失效
    用于制备具有高度间同立构规整度的乙烯基芳族聚合物的方法

    公开(公告)号:US5830959A

    公开(公告)日:1998-11-03

    申请号:US944783

    申请日:1997-10-06

    IPC分类号: C08F4/646 C08F12/08 C08F12/02

    CPC分类号: C08F12/08 C08F4/65912

    摘要: Process for the preparation of crystalline vinylaromatic polymers with a high degree of syndiotacticity which comprises polymerizing vinylaromatic monomers in the presence of a catalytic system essentially consisting of: a) a complex of titanium selected from those having the general formula: (CpR.sub.1 R.sub.2 R.sub.3 R.sub.4 R.sub.5)TiX.sub.3 (I) wherein the groups R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent a hydrogen atom or C.sub.1 -C.sub.10 alkyl groups; X represents a hydrogen atom, a halogen such as chlorine, a C.sub.1 -C.sub.10 alkyl or oxyalkyl radical or a C.sub.6 -C.sub.12 oxyaryl radical; b) an alkylaluminoxane; and c) an organic derivative of tin; characterized in that the alkylaluminoxane is methylaluminoxane (MAO) treated at 20.degree.-80.degree. C. under vacuum for 1-100 hours and the organic derivative of tin is tin tetraphenyl.

    摘要翻译: 用于制备具有高程度间同立构规整度的结晶乙烯基芳族聚合物的方法,其包括在催化体系存在下聚合乙烯基芳族单体,所述催化体系基本上由以下组成:a)选自具有以下通式的那些钛络合物:(CpR1R2R3R4R5)TiX3(I )其中基团R 1,R 2,R 3,R 4和R 5表示氢原子或C 1 -C 10烷基; X表示氢原子,卤素如氯,C1-C10烷基或烷氧基或C6-C12氧芳基; b)烷基铝氧烷; 和c)锡的有机衍生物; 其特征在于烷基铝氧烷是在20-80℃下真空处理1-100小时的甲基铝氧烷(MAO),锡的有机衍生物是四苯基锡。