Process for producing fine spherical silica
    43.
    发明授权
    Process for producing fine spherical silica 失效
    微球形硅石的制造方法

    公开(公告)号:US4842837A

    公开(公告)日:1989-06-27

    申请号:US98301

    申请日:1987-09-18

    摘要: A process for producing fine spherical silica, comprising a step of hydrolyzing an alkoxysilane in a mixed solution comprising water and alcohol and containing an alkaline catalyst, wherein the amount of said alkaline catalyst is 0.5 to 10 in molar ratio to the alkoxysilane used, the concentration of water in said mixed solution of water and alcohol in 5 to 20 mol/lit., and the reaction temperature for said hydrolysis is 30.degree. C. or more.According to this process, there can be obtained highly monodisperse spherical silica containing only a very small amount of impurities and having a particle size of 100 nm or less.

    摘要翻译: 一种球形二氧化硅微球的制造方法,其特征在于,在水和醇的混合溶液中水解含有碱性催化剂的烷氧基硅烷的工序,其中所述碱性催化剂的摩尔比为0.5〜10,所用烷氧基硅烷的浓度为 的水和醇的混合溶液中的水分数为5〜20mol / l,所述水解的反应温度为30℃以上。 根据该方法,可以获得仅含有非常少量的杂质且粒径为100nm以下的高分子单分散球状二氧化硅。

    METHOD FOR PURIFYING CHLOROSILANES
    45.
    发明申请
    METHOD FOR PURIFYING CHLOROSILANES 有权
    纯化氯霉素的方法

    公开(公告)号:US20120121493A1

    公开(公告)日:2012-05-17

    申请号:US13386926

    申请日:2010-07-07

    IPC分类号: C01B33/107

    CPC分类号: C01B33/10778

    摘要: The present invention provides a method for obtaining high purity chlorosilanes from chlorosilanes containing boron impurities and phosphorus impurities. On the basis of the finding that solid by-product formation in the purification of chlorosilanes by adding an aromatic aldehyde results from a catalytic reaction by iron ions or rust-like iron, a Lewis base having a masking effect is added to chlorosilanes. Examples of the Lewis base include a divalent sulfur-containing compound and an alkoxysilane. The divalent sulfur-containing compound is preferably a compound represented by the formula: R—S—R′ (wherein R is a hydrocarbon group or a carbonyl group; and the sum of the carbon atoms in R and R′ is 7 or more), and the alkoxysilane is preferably a compound represented by the formula: RxSi(OR′)4-x (wherein R and R′ are each an alkyl group having 1 to 20 carbon atoms).

    摘要翻译: 本发明提供从含有硼杂质和磷杂质的氯硅烷中获得高纯度氯硅烷的方法。 基于通过添加芳族醛的氯硅烷纯化产生固体副产物的结果是由铁离子或铁锈铁的催化反应产生的,将具有掩蔽效应的路易斯碱加入到氯硅烷中。 路易碱碱的实例包括二价含硫化合物和烷氧基硅烷。 二价含硫化合物优选为由下式表示的化合物:R-S-R'(其中R为烃基或羰基; R和R'中的碳原子总数为7以上) 烷氧基硅烷优选为下式所示的化合物:RxSi(OR')4-x(式中,R和R'分别为碳原子数为1〜20的烷基)。

    METHOD FOR PRODUCING TRICHLOROSILANE
    46.
    发明申请
    METHOD FOR PRODUCING TRICHLOROSILANE 有权
    生产三氯硅烷的方法

    公开(公告)号:US20090060817A1

    公开(公告)日:2009-03-05

    申请号:US12190151

    申请日:2008-08-12

    IPC分类号: C01B33/107

    摘要: A by-product mixture produced in a process for producing polycrystalline silicon is made to react with chlorine to form tetrachlorosilane (STC) distillate in a chlorination reaction vessel, and the tetrachlorosilane (STC) distillate is made to react with hydrogen in a hydrogenation reaction vessel to be converted into trichlorosilane (TCS). In the chlorination step, methyl chlorosilanes having boiling points close to TCS are hyper-chlorinated to be converted into hyper-chlorinated methyl chlorosilanes having higher boiling points, which facilitates the hyper-chlorinated methyl chlorosilanes to be separated into high concentration, and inhibits carbon from contaminating the polycrystalline silicon. A donor/acceptor eliminator is provided in the circulation cycle for producing TCS, and accordingly there is no need to take out a by-product produced in the process for producing TCS to the outside of the system, which can highly purify the TCS.

    摘要翻译: 在多晶硅的制造方法中制造的副产物混合物与氯反应,在氯化反应容器中形成四氯硅烷(STC)馏出物,使四氯硅烷(STC)馏出物在氢化反应容器中与氢反应 转化为三氯硅烷(TCS)。 在氯化步骤中,沸点接近TCS的甲基氯硅烷被高氯化转化为沸点高的高氯甲基氯硅烷,有利于将高氯甲基氯硅烷分离成高浓度,并抑制碳 污染多晶硅。 在生产TCS的循环循环中提供了供体/受体消除器,因此不需要在系统外部将TCS生产过程中产生的副产物取出,这可以高度净化TCS。

    Barcode scanner
    47.
    发明授权
    Barcode scanner 失效
    扫码机

    公开(公告)号:US06811087B2

    公开(公告)日:2004-11-02

    申请号:US10410395

    申请日:2003-04-10

    IPC分类号: G06K710

    CPC分类号: G06K7/10851

    摘要: A barcode scanner comprising a laser driving circuit to drive a laser by a pulse signal generated by an oscillator, a preamplifier to amplify a voltage of a barcode signal from a photodetector corresponding to a reflected light from a barcode scanned by a light output of the laser driven by the pulse signal, a high-pass filter to remove a direct current component contained in an output signal of the preamplifier, a variable gain amplifier which controls an amplification gain of an output signal of the high-pass filter and performs automatic gain control to set an output level almost constant, a synchronous detector to detect a pulse signal contained in an output signal of the variable gain amplifier in synchronization with the output pulse of the oscillator, and a binarization circuit to binarize an output signal of the synchronous detector.

    摘要翻译: 一种条形码扫描器,包括:激光驱动电路,用于通过由振荡器产生的脉冲信号来驱动激光;前置放大器,用于放大来自光电检测器的条形码信号的电压,所述光电检测器对应于来自由激光的光输出扫描的条形码的反射光 由脉冲信号驱动的高通滤波器,去除包含在前置放大器的输出信号中的直流分量;可变增益放大器,其控制高通滤波器的输出信号的放大增益,并执行自动增益控制 为了使输出电平几乎恒定,同步检波器与振荡器的输出脉冲同步地检测包含在可变增益放大器的输出信号中的脉冲信号,以及二值化电路,对同步检波器的输出信号进行二值化。

    Silacyclohexane compound, a method of preparing it and a liquid crystal
composition containing it
    50.
    发明授权
    Silacyclohexane compound, a method of preparing it and a liquid crystal composition containing it 失效
    硅环己烷化合物,其制备方法和含有它的液晶组合物

    公开(公告)号:US5659059A

    公开(公告)日:1997-08-19

    申请号:US331957

    申请日:1994-10-31

    IPC分类号: C07F7/08 C07F7/12 C09K19/40

    摘要: A silacyclohexane compound represented by the following general formula (I). ##STR1## In this formula, R denotes a linear-chain alkyl group with a carbon number of 1-10, a mono- or di- fluoro-alkyl group with a carbon number of 1-10, a branched-chain alkyl group with a carbon number of 3-8, an alkoxyalkyl group with a carbon number of 2-7, or an alkenyl group with a carbon number of 2-8. ##STR2## denotes trans-1-sila-1,4-cyclohexylene or trans-4-sila-1,4-cyclohexylene group whose silicon at position 1 or position 4 has a substitutional group(s) of H, F, Cl or CH.sub.3. X denotes a CN, F, Cl, CF.sub.3, CF.sub.2 Cl, CHFCl, OCF.sub.3, OCHF.sub.2, OCF.sub.2 Cl, OCHFCl, R or OR group (R is the same as defined in the general formula (I)). Y.sub.2 and Z denote H or F, independently to each other. Y.sub.1 denotes H, F or Cl.

    摘要翻译: 由以下通式(I)表示的硅环己烷化合物。 (I)在该式中,R表示碳数为1-10的直链烷基,碳数为1〜10的单 - 或二 - 氟 - 烷基,支链 碳数为3-8的烷基,碳数为2-7的烷氧基烷基或碳数为2-8的烯基。 或其中位置1或位置4的硅具有H,F,Cl或CH 3的取代基的反式-4-硅烷-1,4-亚环己基。 X表示CN,F,Cl,CF 3,CF 2 Cl,CHFCl,OCF 3,OCHF 2,OCF 2 Cl,OCHFCl,R或OR基团(R与通式(I)中定义的相同)。 Y2和Z彼此独立地表示H或F。 Y1表示H,F或Cl。