Abstract:
본 발명은 테트라클로로실란으로부터 트리클로로실란을 효율적으로 제조할 수 있는 장치에 관한 것으로서, 본 발명에 따른 장치는, 액상의 테트라클로로실란에 분산된 금속실리콘 분말을 포함하는 반응원료 유입구; 기상의 반응원료 공급구; 트리클로로실란을 포함하는 반응생성물 유출구; 상기 유입구로 유입된 반응원료가 이송되면서 반응하는 관형 반응기; 및 상기 관형반응기는 반응원료들이 이송되는 과정에서 유체 충돌을 야기하기 위한 유체흐름방해 수단을 구비한다.
Abstract:
A method of preparing a cyclohexasilane compound from trichlorosilane is provided. The method includes contacting trichlorosilane with a reagent composition to produce a compound containing a tetradecahalocyclohexasilane dianion, such as a tetradecachlorocyclohexasilane dianion. The reagent composition typically includes (a) tertiary polyamine ligand; and (b) a deprotonating reagent, such as a tertiary amine having a pKa of at least about 10.5. Methods of converting the tetradecahalocyclohexasilane dianion-containing compound to cyclohexasilane or a dodecaorganocyclohexasilane are also provided.
Abstract:
A method for producing silicon tetrafluoride includes combining uranium oxyfluoride and silicon dioxide; heating the combination below the melting point of the uranium oxyfluoride (14) to sufficiently react the uranium oxyfluoride and the silicon dioxide to produce non-radioactive silicon tetrafluoride and an oxide of uranium (16); and removing the silicon tetrafluoride (18).
Abstract:
Die Erfindung betrifft ein Verfahren zur zumindest teilweisen Entfernung einer Verunreinigung aus einem Gemisch, enthaltend zumindest ein Chlorsilan und/oder Organochlorsilan und zumindest eine Verunreinigung aus der Gruppe mit Borverbindung, Phosphorverbindung, Arsenverbindung und Antimonverbindung. Das Verfahren umfasst die folgenden Schritte: a) Inkontaktbringen des flüssigen Gemischs mit einem Trägermaterial, das mit einem Amidoxim der allgemeinen Strukturformel (I) funktionalisiert ist, mit CAR = Trägermaterial und R1, R2 = unabhängig voneinander H, Alkyl, Alkenyl, Aryl, Alkylaryl; b) gegebenenfalls Abtrennen des funktionalisierten Trägermaterials.
Abstract:
Methods for reducing iron silicide and/or iron phosphide fouling and/or corrosion in a hydrochlorosilane production plant are disclosed. Sufficient hydrogen is added to a silicon tetrachloride process stream to inhibit iron (II) chloride formation and reduce iron silicide and/or iron phosphide fouling, superheater corrosion, or a combination thereof. Trichlorosilane also may be added to the silicon tetrachloride process stream.
Abstract:
Method and apparatus for producing molten purified crystalline silicon from low- grade siliceous fluorspar ore, sulfur trioxide gas, and a metallic iodide salt. Method involves: (1) initially reacting silicon dioxide-bearing fluorspar ore and sulfur trioxide gas in sulfuric acid to create silicon tetrafluoride gas and fluorogypsum; (2) reacting the product gas with a heated iodide salt to form a fluoride salt and silicon tetraiodide; (3) isolating silicon tetraiodide from impurities and purifying it by washing steps and distillation in a series of distillation columns; (4) heating the silicon tetraiodide to its decomposition temperature in a silicon crystal casting machine, producing pure molten silicon metal ready for crystallization; and pure iodine gas, extracted as liquid in a cold-wall chamber. The system is batch process-based, with continuous elements. The system operates largely at atmospheric pressure, requiring limited inert gas purges during batch changes.
Abstract:
A fluidized bed reactor (FBR) for producing chlorosilane mixture, which has high contents of tri- chlorosilane (TCS), by hydro chlorination of metallurgical silicon (MGSI) and a method of producing high contents of TCS stably with the FBR is disclosed. A cooling jacket, which surrounds the lower reactor section, combined with inert initial charging material, which does not react with HC1 during the reaction at a temperature of above 300. degree. C. and pressure of above 5 bar, controls the extreme exothermal heat of the reaction. In addition to this, combination of an optimized gas distributor and a feeder that can feed the metallurgical silicon with accuracy of.+-.5% enabled to realize uniform temperature profile within the reaction zone within.+-.1 degree.degree. C. deviation at 350.degree. C. of average reaction temperature and at 5 bar of reaction pressure.
Abstract:
Die Erfindung betrifft ein Verfahren zur Verminderung des Gehaltes von Elementen der dritten Hauptgruppe des Periodensystems, insbesondere von Bor und Aluminium enthaltenden Verbindungen in Halogensilanen technischer Reinheit zur Herstellung von höchstreinen Halogensilanen, insbesondere von höchstreinen Chlorsilanen. Ferner betrifft die Erfindung eine Anlage zur Durchführung dieses Verfahrens.
Abstract:
Spent potliner from an aluminum reduction cell is subjected to an acid digest (24) and the digest may be adjusted to produce a first gas component comprised of at least one material selected from silicon tetrafluoride, hydrogen fluoride, hydrogen cyanide gas and water vapor (26) and a slurry component comprised of at least one material selected from carbon, silica, alumina, and sodium, iron, calcium and magnesium compounds. The first gas component is removed from the digester and heated to a temperature sufficiently high in a heater/oxidizer (38). Heat produced is recovered in a boiler (42). Hydrogen fluoride gas is water scrubbed (44) and formed into liquid hydrofluoric acid. Gases (56) from the water scrubber are then passed to a caustic scrubber (58) as a polishing step prior to release to the atmosphere.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von Silicium-Nanopartikeln. Das Verfahren umfasst die Schritte: (a) Bereitstellen eines Chlorsilans, wobei das Chlorsilan zumindest eine Si-Si-Einheit aufweist; (b) Hydrolysieren des Chlorsilans unter Bildung eines Hydrolysates; (c) Trocknen des Hydrolysates unter Bildung eines Zwischenproduktes; und (d) Zersetzen des Zwischenproduktes unter Bildung von Silicium-Nanopartikeln.