Large-scale fluidized bed reactor used for trichlorosilane production

Abstract

The invention discloses a large trichlorosilane fluidized bed reactor, comprising a lower reaction section and an upper extension section; the lower part of the reaction section is provided with a silicon powder inlet, and the lower part of a reactor is provided with an overhaul cap which is provided with a hydrogen chloride inlet and a discharge mouth; the extension section has a synthesized gas outlet, and a hydrogen chloride gas distributor is arranged between the overhaul cap and the reaction section; a heat transfer oil finger-shaped tube is arranged in the reaction section and the extension section and extends from the extension section till the bottom of the reaction section; the top of the extension section is provided with a finger-shaped overhaul flange with a finger-shaped tubular heat transfer oil inlet, and the extension section is provided with a finger-shaped tubular heat transfer oil outlet; the outside of the reaction section is provided with a reactor half-pipe jacket, and both ends of the half-pipe jacket of the reactor are provided with a coiled-pipe heat transfer oil inlet and a coiled-pipe heat transfer oil outlet. The heat transfer oil is adopted to heat the reactor during the temperature rising period and transfer the reaction heat during the reaction, and the reaction temperature can be controlled by regulating the quantity of the heat transfer oil, thus acquiring the stable product yielding.

Description

technical field [0001] The invention relates to equipment in the field of chemical industry, in particular to a large fluidized bed reactor for the production of trichlorosilane. Background technique [0002] Trichlorosilane (HSiCl 3 ) is a very versatile organosilicon monomer, mainly used as raw materials for the production of semiconductor silicon, single crystal silicon and polycrystalline silicon, and widely used in various fields of national defense, national economy and even people's daily life. In recent years, my country's demand for trichlorosilane is increasing. [0003] The existing domestic production of trichlorosilane uses a small fluidized bed reactor with a diameter of less than 500mm. Its structure is mostly cylindrical, the upper part with enlarged diameter is the gas-solid separation section, which is equipped with a discharge port, the straight cylindrical section in the middle is the reaction section, the reaction section is covered with a heater, the ...

AI Technical Summary

Problems solved by technology

The biggest shortcoming of this device is that the reaction temperature is not easy to control, resulting in unstable yield of product trichlorosilane

Images