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EFFECT: silane synthesis from economy raw materials; safe technology.

EFFECT: silane synthesis from economy raw materials; safe technology.

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Alkylsilane synthesis - Organic chemistry

The method provides a low output silane, about 90% and a relatively high content of impurities of the hydrocarbon - 10-2mol.%. The disadvantage is the low degree of reaction of calcium hydride, 6-9%. Due to the low degree of conversion of calcium hydride, there is additional work that lie in the synthesis of a large number of calcium hydride, time-consuming and mechanical grinding. The amount of calcium hydride spent in obtaining a single number silane, significantly greater than stoichiometric. Synthesis of silane are periodically what exhaust calcium hydride is unloaded from the reactor and the process is further performed on the new download active calcium hydride. Produced by domestic industry hydride calcium unacceptable for use as a reductant tetrafluoride silicon upon receipt of silane, as it contains the products of its oxidation by atmospheric moisture, significantly reducing the yield of silane.

Arylsilane synthesis - Organic chemistry

SUBSTANCE: industrial silicon with industrial methanol react in the presence of a catalyst at high temperature. From the products of the reaction, hydrogen-containing methoxysilane in a mixture with tetramethoxysilane is separated. Monosilane is obtained through catalyst disproportioning of hydrogen-containing methoxysilanes, and cleaned through adsorption on active carbon. Temperature fall between the stages of separating hydrogen-containing methoxysilanes and subsequent catalyst disproportioning does not decrease by less than 60°C. Purifying monosilane from carbon-containing impurities is done through throttle discharge of monosilane from high pressure of 60 kg/cm2 to low pressure of 1-3 kg/cm2, providing for lowering temperature of gaseous monosilane with impurities to temperature not higher than minus 10°C and formation of a dispersed phase of tetramethoxysilane. Through hydrolysis of tetramethoxysilane, silicon dioxide is obtained, which is reduced to silicon and returned to the stage of direct synthesis of trimethoxysilane.

Research & Essay: SILANE synthesis and all papers are …

Special Silane Syntheses

SUBSTANCE: invention can be used in synthesis of highly pure silane used in production of silicon in form of monocrystals and films and coatings from isotope enriched silicon dioxide. Silicon tetrafluoride is reduced by calcium hydride at 180-200 °C with subsequent purification from fluorine-containing impurities by passing the obtained silane through a reactor with calcium hydride and hydrocarbon impurities. Silicon tetrafluoride is reduced in the presence of hydrogen with mechanical activation in a horizontally placed flow reactor rotating at 90-150 rpm, for which the reactor is filled with grinding bodies. Highly pure isotope enriched silanes 28SiH4, 29SiH4 or 30SiH4 are obtained in the version of the invention.

SUBSTANCE: invention can be used in synthesis of highly pure silane used in production of silicon in form of monocrystals and films and coatings from isotope enriched silicon dioxide. Silicon tetrafluoride is reduced by calcium hydride at 180-200 °C with subsequent purification from fluorine-containing impurities by passing the obtained silane through a reactor with calcium hydride and hydrocarbon impurities. Silicon tetrafluoride is reduced in the presence of hydrogen with mechanical activation in a horizontally placed flow reactor rotating at 90-150 rpm, for which the reactor is filled with grinding bodies. Highly pure isotope enriched silanes 28SiH4, 29SiH4 or 30SiH4 are obtained in the version of the invention.

Control synthesis of isocyanate and alkoxy-silane ..

21/04/2003 · Control synthesis of isocyanate and alkoxy-silane terminated ..

SUBSTANCE: industrial silicon with industrial methanol react in the presence of a catalyst at high temperature. From the products of the reaction, hydrogen-containing methoxysilane in a mixture with tetramethoxysilane is separated. Monosilane is obtained through catalyst disproportioning of hydrogen-containing methoxysilanes, and cleaned through adsorption on active carbon. Temperature fall between the stages of separating hydrogen-containing methoxysilanes and subsequent catalyst disproportioning does not decrease by less than 60°C. Purifying monosilane from carbon-containing impurities is done through throttle discharge of monosilane from high pressure of 60 kg/cm2 to low pressure of 1-3 kg/cm2, providing for lowering temperature of gaseous monosilane with impurities to temperature not higher than minus 10°C and formation of a dispersed phase of tetramethoxysilane. Through hydrolysis of tetramethoxysilane, silicon dioxide is obtained, which is reduced to silicon and returned to the stage of direct synthesis of trimethoxysilane.

Methylsilanes are the raw materials for manufacturing silicones. They are produced by direct reaction between silicon and methyl chloride in the Mueller Rochow synthesis. They are extremely mobile, colourless, liquids that are soluble in organic solvents and, in some cases, in anhydrous alcohol. Silanes have low molecular weights and are thus highly volatile.

Silicone synthesis; Phenyl Silane.
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  • Synthesis and characterization of silane coated …

    SILANE SYNTHESIS

  • Silane, siloxane,… synthesis by silylation or hydrosilylation

    Synthesis of silane oligomers containing vinyl and epoxy group for improving the adhesion of addition-cure silicone ..

  • Synthesis and Characterization of Polydimethylsiloxane …

    Enantioselective synthesis of crotyl geminal bis(silane) and its usage for asymmetric Sakurai allylation of acetals

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Synthesis and Antimicrobial Activity of Quaternary Ammonium Silane ..

We have so far synthesized many fluorinated silane coupling agents, Rf CH 2 CH 2 SiX 3 (Rf = fluoroalkyl group; X = Cl, OCH 3 , NCO), and demonstrated that the glass surfaces modified with these agents are highly water and oil repellent, acid resistant, and oxidation resistant [1–8,10,12–14] .

Synthesis of Fluorine-Containing Organic Silane Reagent

The technical result is to reduce labor costs and cheaper way to obtain high-purity silane, isotope-enriched including by increasing the degree of conversion of calcium hydride, is thus the synthesis of lead safe work upon receipt of the required quantity of silane.

Tris(trimethylsilyl)silane for synthesis | VWR

Iron oxide nanoparticles (IONPs) and their surface modifications with therapeutic or diagnostic (theranostic, TN) agents are of great interest. Here we present a novel one-pot synthesis of a versatile general TN precursor (aminosilane-coated IONPs [IONP-(NH2)]) with surface amine groups. Surface functional group conversion to carboxylic acid was accomplished by conjugating poly(ethylene glycol) diacid to IONP-(NH2). The NPs were characterized using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FT-IR) spectroscopy. Biocompatibility and cell uptake profile of the nanoparticles were evaluated -vitro using cultured liver cells (HepG2). Oleylamine (hydrophobic) and bovine serum albumin (BSA) as model drugs were attached to IONP--PEG(COOH). The ability of IONP-(NH2) to bind small interfering RNA (siRNA) is also shown.

Artemis Project: Synthesis of Silane

Industrial silicone production has its commercial basis in the direct synthesis of methylchlorosilanes from silicon and methylchloride via a process called the Mueller-Rochow synthesis. This technique, developed independently in 1940/41 by professors R Mueller in Germany and E G Rochow in the United States, takes place in the presence of a copper catalyst at approximately 280°C. Finely ground and well mixed Si and Cu are brought together in a fluid bed reactor with methyl chloride in gaseous form. This produces a silane mixture from which the most important organochlorosilanes are derived.

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