Process for preparing aerogels
    3.
    发明授权
    Process for preparing aerogels 失效
    制备气凝胶的方法

    公开(公告)号:US5759506A

    公开(公告)日:1998-06-02

    申请号:US836184

    申请日:1997-05-01

    摘要: The invention relates to a process for preparing modified SiO.sub.2 gels, in which the gel is aged using a solution of a condensable alkyl and/or aryl orthosilicate, or using an aqueous silicic acid solution, in order to strengthen the structure of the gel.

    摘要翻译: PCT No.PCT / EP95 / 04141 Sec。 371日期1997年5月1日 102(e)日期1997年5月1日PCT提交1995年10月23日PCT公布。 WO96 / 14266 PCT公开号 日期1996年5月17日本发明涉及一种制备改性SiO 2凝胶的方法,其中使用可冷凝的烷基和/或原硅酸盐溶液或使用硅酸水溶液使凝胶老化,以加强 凝胶。

    Process for the preparation of xerogels
    5.
    发明授权
    Process for the preparation of xerogels 失效
    干凝胶的制备方法

    公开(公告)号:US5647962A

    公开(公告)日:1997-07-15

    申请号:US495931

    申请日:1995-06-28

    摘要: The invention relates to modified SiO.sub.2 gels (xerogels), the preparation thereof and the use thereof as thermal insulators. The xerogels are prepared by acidifying an aqueous waterglass solution, polycondensing the silicic acid produced thereby, by adding a base, to an SiO.sub.2 gel, removing the water from the resulting gel by extractive distillation with an organic solvent which forms with water an azeotrope which separates on cooling into two phases, reacting the gel with a silylating agent, and then drying at pressures and temperatures which are below the critical pressure and/or the critical temperature of the organic solvent used for removing the water.

    摘要翻译: 本发明涉及改性SiO 2凝胶(干凝胶),其制备及其作为热绝缘体的用途。 干凝胶是通过酸化水性水玻璃溶液来制备的,将由此产生的硅酸,通过加入碱进行缩聚,制成SiO 2凝胶,通过萃取蒸馏,用水形成的有机溶剂除去水,共沸物分离 在冷却成两相时,使该凝胶与甲硅烷基化试剂反应,然后在低于用于除去水的有机溶剂的临界压力和/或临界温度的压力和温度下干燥。

    Process for the preparation of hydrofluorocarbons
    9.
    发明授权
    Process for the preparation of hydrofluorocarbons 失效
    制备氢氟烃的方法

    公开(公告)号:US5510545A

    公开(公告)日:1996-04-23

    申请号:US320845

    申请日:1994-10-07

    摘要: The invention relates to a process for the preparation of saturated hydrofluorocarbons by hydrogenating at least one (hydro)fluorocarbon of the formula (I)R.sub.f --CH.sub.n Cl.sub.c Br.sub.d I.sub.e (I)in whichR.sub.f is C.sub.a F.sub.(2a-b)+1 H.sub.b where a is 1-4 and b is 0-4,n is 0-2c is 0-3d is 0-3e is 0-3c+d+e is 3-n,catalytically with hydrogen at elevated temperature.

    摘要翻译: 本发明涉及一种制备饱和氢氟烃的方法,该方法是通过氢化至少一种式(Ⅰ)Rf-CHClClBI(I)(其中Rf为CaF(2a-b)+ 1Hb) 4和b是0-4,n是0-2c是0-3d是0-3 e是0-3c + d + e是3-n,在升高的温度下用氢催化。

    Process for the removal of olefinic impurities from
1,1,1,2,3,3,3-heptafluoropropane
    10.
    发明授权
    Process for the removal of olefinic impurities from 1,1,1,2,3,3,3-heptafluoropropane 失效
    从1,1,1,2,3,3,3-七氟丙烷中除去烯属杂质的方法

    公开(公告)号:US5475169A

    公开(公告)日:1995-12-12

    申请号:US879810

    申请日:1992-05-07

    CPC分类号: C07C17/395

    摘要: Process for the removal of olefinic impurities from 1,1,1,2,3,3,3-heptafluoropropaneThe invention relates to a process for the removal of olefinic impurities from 1,1,1,2,3,3,3-heptafluoropropane (R 227) in which the contaminated R 227 is brought into contact with an alcohol and a base, and the R 227 is simultaneously or subsequently removed by distillation.

    摘要翻译: 从1,1,1,2,3,3,3-七氟丙烷中除去烯属杂质的方法本发明涉及一种从1,1,1,2,3,3,3-七氟丙烷中除去烯属杂质的方法, 七氟丙烷(R 227),其中被污染的R 227与醇和碱接触,并且R 227同时或随后通过蒸馏除去。