Patent classifications
C07F7/16
Process for preparing methylchlorosilanes with structure-optimised silicon particles
A process for producing methylchlorosilanes of general formula 1, (CH.sub.3).sub.nH.sub.mSiCl.sub.4-n-m, in which n represents values from 1 to 3 and m represents values of 0 or 1 in a fluidized bed reactor is provided. A chloromethane-containing reaction gas is reacted with a particulate contact mass containing silicon in the presence of copper catalyst. An operating granulation contains at least 1% by mass of silicon-containing particles S described by a structural parameter S. S has a value of at least 0 and is calculated according to equation (1),
wherein ?.sub.S is symmetry-weighted sphericity factor, ?.sub.SD is poured density [g/cm.sup.3], and ?.sub.F is average particle solids density [g/cm.sup.3].
Process for preparing methylchlorosilanes with structure-optimised silicon particles
A process for producing methylchlorosilanes of general formula 1, (CH.sub.3).sub.nH.sub.mSiCl.sub.4-n-m, in which n represents values from 1 to 3 and m represents values of 0 or 1 in a fluidized bed reactor is provided. A chloromethane-containing reaction gas is reacted with a particulate contact mass containing silicon in the presence of copper catalyst. An operating granulation contains at least 1% by mass of silicon-containing particles S described by a structural parameter S. S has a value of at least 0 and is calculated according to equation (1),
wherein ?.sub.S is symmetry-weighted sphericity factor, ?.sub.SD is poured density [g/cm.sup.3], and ?.sub.F is average particle solids density [g/cm.sup.3].
DIRECT SYNTHESIS OF ALKENYLHALOSILANES
A process for the direct synthesis of alkenylhalosilane monomers. Forming a slurry of liquid and copper-activated silicon from fresh silicon, cyclone fines and/or fine dust from silicon grinding, ultrafines and/or spent contact mass from the Direct Synthesis of alkylhalosilanes and arylhalosilanes, in a thermally stable solvent. Reacting the silanes by agitating the slurry with at least one unsaturated aliphatic or cycloaliphatic organohalide of the formula R.sup.1X, and optionally an organohalosilane and/or hydrogen halide, in the presence of a polymerization inhibiting Lewis base additive, at a reaction time, temperature and pressure effective to produce alkenylhalosilanes having the formulae, R.sup.1SiHX.sub.2, R.sup.1.sub.2SiHX, R.sup.1.sub.3SiX, R.sup.1SiX.sub.3, and R.sup.1.sub.2SiX.sub.2 or mixtures thereof.
DIRECT SYNTHESIS OF ALKENYLHALOSILANES
A process for the direct synthesis of alkenylhalosilane monomers. Forming a slurry of liquid and copper-activated silicon from fresh silicon, cyclone fines and/or fine dust from silicon grinding, ultrafines and/or spent contact mass from the Direct Synthesis of alkylhalosilanes and arylhalosilanes, in a thermally stable solvent. Reacting the silanes by agitating the slurry with at least one unsaturated aliphatic or cycloaliphatic organohalide of the formula R.sup.1X, and optionally an organohalosilane and/or hydrogen halide, in the presence of a polymerization inhibiting Lewis base additive, at a reaction time, temperature and pressure effective to produce alkenylhalosilanes having the formulae, R.sup.1SiHX.sub.2, R.sup.1.sub.2SiHX, R.sup.1.sub.3SiX, R.sup.1SiX.sub.3, and R.sup.1.sub.2SiX.sub.2 or mixtures thereof.
Process for preparing monohydrogentrihalosilanes
A process for preparing a product including a monohydrogentrihalosilane is disclosed. The process includes the steps of: 1) initially charging a reactor with a contact mass including both fresh silicon and recycled contact mass, where the recycled contact mass is obtained from during or after a production phase of an inorganic Direct Process reaction for production of a monohydrogentrihalosilane; and thereafter 2) feeding to the reactor a hydrogen halide and additional fresh silicon, thereby forming the product.
Perchlorinated disilenes and germasilenes and also neopentatetrelanes, a method for the preparation thereof and use thereof
The invention provides disilenes, germasilenes and neopentatetrelanes, a method for the preparation thereof and use thereof.
Perchlorinated disilenes and germasilenes and also neopentatetrelanes, a method for the preparation thereof and use thereof
The invention provides disilenes, germasilenes and neopentatetrelanes, a method for the preparation thereof and use thereof.
Process for preparing tetralin compounds
The present disclosure describes processes and intermediates useful for preparing a compound of Formula (Xa) or Formula (Xb). The processes and intermediates can be used to prepare the compounds of the disclosure at multigram or kilogram scale. ##STR00001##
Process for preparing tetralin compounds
The present disclosure describes processes and intermediates useful for preparing a compound of Formula (Xa) or Formula (Xb). The processes and intermediates can be used to prepare the compounds of the disclosure at multigram or kilogram scale. ##STR00001##
Process for production of halosilanes from silicon-containing ternary intermetallic compounds
A process for preparing a reaction product including a halosilane includes: contacting an unsaturated hydrocarbyl halide and a ternary intermetallic compound at a temperature of 300 C. to 700 C. to form the reaction product. The ternary intermetallic compound includes copper, silicon and a transition metal. The halosilane in the reaction product has formula R1.sub.mR.sup.2.sub.nH.sub.oSiX.sub.(4mno)> where each R.sup.1 is independently a saturated monovalent hydrocarbyl group, each R.sup.2 is independently an unsaturated monovalent hydrocarbyl group; each X is independently a halogen atom; subscript m is 1, 2, or 3; subscript n is 0, 1, or 2; subscript o is 0, 1, or 2; and a quantity (m+n+o) is 1, 2, or 3. At least a portion of the unsaturated hydrocarbyl groups in the unsaturated hydrocarbyl halide are converted to saturated hydrocarbyl groups (R.sup.1) in the halosilane.