Trichlorosilane production process and trichlorosilane production system
A trichlorosilane and production system technology, applied in the direction of silicon compounds, halosilanes, halide silicon compounds, etc., can solve the problems of large particle size of silicon powder raw materials, increased process instability, and small production capacity of trichlorosilane , to achieve the effects of reducing the operating load, improving the utilization rate of raw materials, and reducing the amount of slag waste treatment
Inactive Publication Date: 2020-04-10
新疆东方希望新能源有限公司
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Problems solved by technology
However, since the cold hydrogenation process is a gas-solid phase raw material reaction and the particle size of the silicon powder raw material is large, the utilization rate of the entire raw material is not high, resulting in high consumption of raw and auxiliary materials and low overall conversion rate
And because large particles of silicon powder enter the follow-up system, it is easy to cause pipeline blockage, which makes the maintenance frequency high, resulting in a small production capacity of trichlorosilane
Therefore, if the advanced cold hydrogenation process cannot strictly control the working conditions to ensure continuous production, it may not only fail to reduce costs and increase efficiency, but may increase the instability of the process
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[0028] Such as figure 1 As shown, a trichlorosilane production system includes a silicon powder receiving tank 1, a reactor 2, a washing tower 4 and a crude distillation tower 5; the silicon powder receiving tank 1 is connected with the reactor 2 to provide silicon powder raw material for the reactor 2 In the reactor 2, four cyclone separators 12 are set near the outlet of the top at the same level, after the outlets of the cyclone separators 12 are merged respectively in pairs, and then uniformly merged to discharge from the reactor outlet, the outlet of the reactor 2 top and the washing The tower 4 is connected, and the inlet of the hydrogen / silicon tetrachloride mixed gas 7 is set at the bottom of the reactor; the side of the washing tower 4 is provided with a liquid outlet and mixed with the silicon powder raw material in a mixer 13 before the washing tower inlet through the washing tower circulation pump 3 After feeding, the bottom of the washing tower 4 is provided with ...
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The invention provides a trichlorosilane production process and a trichlorosilane production system. According to the invention, a U-shaped distributor is additionally arranged, cyclone separators reasonably distributed are arranged in a reactor, and process parameters matched with the cyclone separators are adjusted; by changing the distribution form of mixed raw materials entering the reactor and improving the fluid condition in the reactor during a reaction, a plurality of the cyclone separators are arranged to separate unreacted silicon powder, and process parameter improvement is combined, so that the reaction conversion rate is improved, the high operation load caused by the entering of the silicon powder into the subsequent system is reduced, and the possibility of pipeline blockageis reduced; a circulating material liquid taking port and a rectification liquid recovery port in the process operation process are changed from the tower bottom to the tower side, so that the abrasion of the silicon powder to a pump body is reduced, and frequent overhaul is avoided; and with the process and the system, the operation stability of the trichlorosilane production device is improved,the raw material utilization rate is increased, and the production benefit is improved.
Description
technical field [0001] The invention relates to the field of cold hydrogenation production of silicon tetrachloride, in particular to a production process and system of trichlorosilane. Background technique [0002] Silicon tetrachloride is a common by-product in the production process of polysilicon, and its subsequent economical treatment is a problem that plagues enterprises. On the one hand, if silicon tetrachloride is used for water treatment, the energy consumption cost is high, and at the same time, it will cause damage to the environment; [0003] The cold hydrogenation process is to convert silicon tetrachloride into trichlorosilane at a lower temperature. As the current advanced silicon tetrachloride utilization process, it has replaced the thermal hydrogenation production technology with lower cost and conversion rate and promoted it in the existing technology. application. However, since the cold hydrogenation process is a gas-solid phase raw material reaction ...
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Login to View More IPC IPC(8): C01B33/107
CPCC01B33/1071
Inventor焦强强简凤麟赵小飞杜红涛贾占位尤吉升
Owner新疆东方希望新能源有限公司