Heat-pump energy-saving separating device for extracting trichlorosilane by adopting static mixing booster and method

Abstract

The invention relates to a heat-pump energy-saving separating device for extracting trichlorosilane by adopting a static mixing booster and a method. The heat-pump energy-saving separating device comprises a rectifying tower, the static mixing booster, a condensation reboiler and an evaporator, wherein the static mixing booster is arranged among the rectifying tower, the condensation reboiler and the evaporator and consists of a shrinking section, a mixing section, a lateral ejecting pipe and a diffusing section; the top of the rectifying tower is connected with low-pressure steam by the lateral ejecting pipe of the static mixing booster; the shrinking section of the static mixing booster is connected with the evaporator; and the condensation reboiler is connected with the diffusing section of the static mixing booster. In the invention, the static mixing booster is utilized for mixing the two strands of tower-top steam under different pressure and temperature, heat exchange is carried out on the two strands of tower-top steam and tower bottoms in the condensation reboiler, and the heat of the tower-top steam is fully utilized, so that the energy consumption is reduced greatly and the energy is saved by 80% compared with that of the traditional rectifying system. In addition, after purification by the process, the purity of a trichlorosilane product can be up to 99.99999%, and the yield of products also can be up to more than 75.0%.

Description

technical field [0001] The invention belongs to the technical field of rectification, and adopts a static mixing booster to purify trichlorosilane heat pump energy-saving separation device and method, and particularly proposes a trichlorosilane separation and purification system and operation method in polysilicon production process. Background technique [0002] Trichlorosilane is also known as trichlorosilane and silicon chloroform, and its molecular formula is SiHCl 3 It is used in the synthesis of organosilanes and alkyl, aryl and organofunctional group chlorosilanes. It is the most basic monomer in organosilane coupling agents and is also the raw material for the production of semiconductor silicon and single crystal silicon. [0003] With the rapid development of polysilicon and organic silicon industry, there is a great demand for trichlorosilane. However, due to the restriction of foreign technology blockade, there are only a few domestic manufacturers of trichlorosi...

AI Technical Summary

Problems solved by technology

In order to meet the requirements of high purity, most manufacturers use higher rectification towers with relatively large reflux, and their equipment investment and energy consumption are relatively high.

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