一种四氯化硅密闭精馏装置

Abstract

本实用新型提供一种四氯化硅密闭精馏装置，包括：一级精馏塔，设于一级精馏塔内的若干层塔盘，设于一级精馏塔中部的喷淋头，设于一级精馏塔底部且与吸附塔循环连通的二级再沸器，与一级精馏塔的底部出料口通过二级水泵连通的二级精馏塔，设于二级精馏塔中部的环形分布器，设于环形分布器下方且通过电机驱动的刮膜蒸发器，设于二级精馏塔上部的环形冷凝板，通过上述方案，一级精馏塔采用多层塔盘结合中部喷淋头，强化气液接触与传质效率，二级精馏塔配置刮膜蒸发器和环形分布器，实现高沸点杂质的高效分离，整体装置通过多级精馏、优化结构及合理连接，有效解决了传统精馏装置提纯效果差的问题，提高了四氯化硅的提纯质量和效率。

Claims

1. A closed distillation apparatus for silicon tetrachloride, characterized by comprising: include: A primary distillation column (2), several trays (201) disposed within the primary distillation column (2), a spray head (202) disposed in the middle of the primary distillation column (2), a secondary reboiler (203) disposed at the bottom of the primary distillation column (2) and in circulation with the primary distillation column (2), a second condenser (204) connected to the top outlet of the primary distillation column (2), a first silicon tetrachloride storage tank (205) connected to the second condenser (204), and a vacuum pump (308) connected to the first silicon tetrachloride storage tank (205). A secondary distillation column (3) is connected to the bottom outlet of the primary distillation column (2) via a secondary water pump (206). An annular distributor (302) is located in the middle of the secondary distillation column (3). A scraped film evaporator (303) is located below the annular distributor (302) and driven by a motor. An annular condenser plate (301) is located at the top of the secondary distillation column (3). A third condenser (306) is connected to the gas outlet of the secondary distillation column (3). A second silicon tetrachloride storage tank (307) is connected to the third condenser (306). The vacuum pump (308) is connected to the second silicon tetrachloride storage tank (307).

2. The closed distillation apparatus for silicon tetrachloride according to claim 1, characterized in that, Also includes: The adsorption tower (1) includes a feed liquid inlet (106) located in the middle of the adsorption tower (1), a catalyst screen (101) located in the middle of the adsorption tower (1), a packing zone (102) located at the bottom of the adsorption tower (1), a first-stage reboiler (104) located at the bottom of the adsorption tower (1) and in circulation with the adsorption tower (1), and the bottom outlet of the adsorption tower (1) is connected to the first-stage distillation tower (2) via a first-stage water pump (105).

3. The silicon tetrachloride closed rectification apparatus according to claim 2, wherein The bottom side wall of the secondary distillation column (3) is provided with a heating jacket (304), and the heating jacket (304) is connected to a tertiary reboiler (305).

4. The silicon tetrachloride closed rectification apparatus according to claim 3, wherein The secondary reboiler (203) and the tertiary reboiler (305) are both connected to the primary reboiler (104).

5. The closed distillation apparatus for silicon tetrachloride according to claim 2, characterized in that, The top outlet of the adsorption tower (1) is connected to a first condenser (103), and the outlet of the first condenser (103) is connected to the raw material liquid inlet (106) through a circulation pipe.

6. The silicon tetrachloride closed rectification apparatus according to claim 2, wherein The catalyst sieve (101) is filled with an active alumina catalyst loaded with copper chloride.

7. The silicon tetrachloride closed rectification apparatus according to claim 2, wherein The packing zone (102) is filled with molecular sieves and silica gel mixed in a 1:1 volume ratio.

8. The silicon tetrachloride closed rectification apparatus according to claim 2, wherein The bottom of the adsorption tower (1) is equipped with a ceramic membrane filter (107).

9. The silicon tetrachloride closed rectification apparatus according to claim 1, wherein The spray head (202) is connected to an azeotropic agent storage tank, which stores n-hexane.

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