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    • 21. 发明授权
    • Method for the purification of hexamethyldisiloxane
    • 六甲基二硅氧烷纯化方法
    • US4370204A
    • 1983-01-25
    • US354466
    • 1982-03-03
    • Hans-Joachim KotzschHans-Joachim Vahlensieck
    • Hans-Joachim KotzschHans-Joachim Vahlensieck
    • C07F7/20B01D3/36
    • C07F7/20
    • Process for purifying hexamethyldisiloxane contaminated with toluene or other solvents that cannot be completely separated from the hexamethyldisiloxane by distillation, based on the discovery that hexamethyldisiloxane forms a previously unknown azeotrope with acetonitrile. This azeotrope has a heavier phase that is rich in acetonitrile and a lighter phase that is rich in hexamethyldisiloxane. These phases are mutually immiscible. The azeotrope starts to boil at 71.4.degree. C., which permits the hexamethyldisiloxane to be separated at relatively low temperatures from the impurities. The process involves one or more entrainment distillations in the presence of an excess of acetonitrile and the re-separation of the acetonitrile from the resulting lighter phase by distillation. Two further novel azeotropic systems, one consisting of hexamethyldisiloxane and toluene and the other of acetonitrile and toluene, are provided.
    • 基于六甲基二硅氧烷与乙腈形成先前未知的共沸物的发现,用于净化由甲苯或其它不能与六甲基二硅氧烷分离的其它溶剂的六甲基二硅氧烷的纯化方法。 该共沸物具有富含乙腈的较重相和富含六甲基二硅氧烷的较轻相。 这些阶段是互不混溶的。 共沸物在71.4℃开始沸腾,这允许六甲基二硅氧烷在相对较低的温度下与杂质分离。 该过程涉及在过量的乙腈存在下进行一次或多次夹带蒸馏,并通过蒸馏从所得更轻的相中重新分离乙腈。 提供两个另外的新型共沸系统,一个由六甲基二硅氧烷和甲苯组成,另一个是乙腈和甲苯。
    • 27. 发明授权
    • Method of cleaving organosiloxanes
    • 裂解有机硅氧烷的方法
    • US4417067A
    • 1983-11-22
    • US446756
    • 1982-12-03
    • Hans-Joachim KotzschHans-Joachim Vahlensieck
    • Hans-Joachim KotzschHans-Joachim Vahlensieck
    • C07F7/12C07F7/08
    • C07F7/123
    • The present invention relates to the cleavage of organosiloxanes with hydrogen chloride with the formation of organochlorosilanes. In accordance with the invention, this cleavage is performed at temperatures below 20.degree. C., and the dihydrates and trihydrates of the hydrogen chloride are formed. These settle as the specifically heavier, liquid phase and thus can easily be separated from the organochlorosilanes. The preferred temperature range in which the procedure of the invention is performed is between +10.degree. C. and -10.degree. C., while yields of as much as 99% of the desired organochlorosilane are obtained. The process can also be performed continuously.The inventive process is particularly useful because it can be used to convert contaminated organosiloxanes, such as used heat exchange or hydraulic oil materials, into useful products.
    • 本发明涉及在形成有机氯硅烷的情况下用氯化氢裂解有机硅氧烷。 根据本发明,该切割在低于20℃的温度下进行,形成氯化氢的二水合物和三水合物。 它们作为特别重的液相沉降,因此可以容易地与有机氯硅烷分离。 进行本发明方法的优选温度范围为+10℃至-10℃,得到所需有机氯代硅烷的产率高达99%。 该过程也可以连续执行。 本发明的方法特别有用,因为它可以用于将受污染的有机硅氧烷,例如用过的热交换或液压油材料转化为有用的产品。