Abstract: The present invention relates to a specific process for producing trisilylamine from monochlorosilane and ammonia in the liquid phase. The invention further relates to a plant in which such a process can be carried out with advantage.

Abstract: A plant having a first device for the preparation of ethyne by partial oxidation of at least one hydrocarbon, generating a first ethyne-containing product gas stream, having a second device for the electrothermal preparation of ethyne, generating a second ethyne-containing product gas stream, and having a separating device for separating ethyne from a gas stream, to which both the first and the second product gas streams are fed, can make efficient use of excess electrical energy by operating the device for the electrothermal preparation of ethyne with excess electrical energy.

Abstract: A plant for preparing trisilylamine in the gas phase is provided. The plant includes a reactor (1) suitable for the reaction of at least the starting materials ammonia and monohalosilane in the gas phase; a precipitation vessel (2) downstream of the reactor (1); and a mixer (3) suitable for producing a homogeneous gas mixture containing at least the starting materials ammonia and monohalosilane upstream of the reactor (1). The mixer (3), reactor (1) and precipitation vessel (2) are connected to one another structurally in such a way that a continuous gas flow through the plant is ensured, with the gas flow optionally being able to be interrupted at one or more suitable points within the plant.

Abstract: The present invention relates to a specific process for producing trisilylamine from monochlorosilane and ammonia in the liquid phase. The invention further relates to a plant in which such a process can be carried out with advantage.

Abstract: The invention relates to a method for producing trisilylamine from ammoniac and monochlorosilane in the gas phase. The invention further relates to a plant in which such a method can be performed.

Abstract: The invention relates to the use of a ceramic heat exchanger as an integral part of a process for catalytic dehalogenation of silicon tetrachloride to trichlorosilane in the presence of hydrogen, wherein the product gas and the reactant gases are conducted as pressurized streams through the heat exchanger, and the heat exchanger comprises heat exchanger elements made from ceramic material.

Abstract: The present invention relates to a multistage process for preparing trichlorosilane and silicon tetrachloride from metallurgical silicon, in which trichlorosilane and silicon tetrachloride are prepared from metallurgical silicon in a first step, and the silicon tetrachloride is processed further to the trichlorosilane end product in a second step. The present invention further relates to a plant in which such processes can be performed in an integrated manner.

Abstract: The invention relates to a complete method for producing pure silicon that is suitable for use as solar-grade silicon, comprising the reduction of a purified silicon oxide using one or more pure carbon sources, the purified silicon oxide, which was purified as silicon oxide dissolved in an aqueous phase, having a content of other polyvalent metals or metal oxides, in relation to the silicon oxide, of less than or equal to 300 ppm, preferably less than 100 ppm, especially preferably less than 50 ppm and according to the invention less than 10 ppm of the other metals and being obtained advantageously by gel formation in alkaline conditions. The invention also relates to a formulation containing an activator and to the use of purified silicon oxide together with an activator for producing silicon.

Abstract: The invention relates to a complete method for producing pure silicon that is suitable for use as solar-grade silicon, comprising the reduction of a silicon oxide, purified by acidic precipitation from an aqueous solution of a silicon oxide dissolved in an aqueous phase, using one or more pure carbon sources, the purified silicon oxide being obtained, in particular, by the precipitation of a silicon oxide dissolved in an aqueous phase in an acidifier. The invention also relates to a formulation containing an activator and to a device for producing silicon, a reactor and electrodes.

Abstract: The invention relates to a process for continuous preparation of alkyl (meth)acrylates by transesterification of methyl (meth)acrylate using alcohols which are high-boiling relative to methanol. A particular workup technique achieves product qualities which have hitherto not been attained. Very high space-time and overall yields can also be achieved.

Abstract: The invention relates to a process for continuous preparation of alkyl (meth)acrylates by transesterification of methyl (meth)acrylate using alcohols which are high-boiling relative to methanol. A particular workup technique achieves product qualities which have hitherto not been attained. Very high space-time and overall yields can also be achieved.