Baffle reaction-rectification equipment and anti-disproportionation reaction between dichlorosilane and silicon tetrachloride

A technology of reactive rectification and reactive rectification tower is applied in the field of clapboard reactive rectification equipment and in the field of reverse disproportionation reaction of dichlorodihydrosilicon and silicon tetrachloride, and can solve the problems of flammable and explosive, silicon tetrachloride, etc. The problems of large amount to be treated and low boiling point of dichlorodihydrosilicon can achieve the effect of reducing energy consumption, improving the utilization rate of raw materials, and improving the total conversion rate

Active Publication Date: 2011-05-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For silicon tetrachloride, there have been methods such as cold hydrogenation to treat it and convert it into trichlorosilane for reuse. However, the domestic cold hydrogenation process is immature, and it has been difficult to master its core technology, with low efficiency and high energy consumption. And the amount of silicon tetrachloride to be treated is very large; for dichlorodihydrosilan

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  • Baffle reaction-rectification equipment and anti-disproportionation reaction between dichlorosilane and silicon tetrachloride
  • Baffle reaction-rectification equipment and anti-disproportionation reaction between dichlorosilane and silicon tetrachloride
  • Baffle reaction-rectification equipment and anti-disproportionation reaction between dichlorosilane and silicon tetrachloride

Examples

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example 1

[0021] The clapboard anti-disproportionation reaction rectification comprehensively utilizes 4000 tons / year of dichlorodihydrosilane and 6800 tons / year of silicon tetrachloride.

[0022] Composition of mixed chlorosilane raw materials: DCS:TCS:STC=1:1:1 (molar ratio). The feeding amount of mixed chlorosilane raw materials is 2t / h.

[0023] There are 6 theoretical plates in the A\H section of the clapboard reactive distillation column, 6 theoretical plates in the B\F section, 12 theoretical plates in the D\G section, and 2-meter-high reaction plates in the C\E sections. Catalyst, this example selects solid-loaded quaternary ammonium salt as reaction catalyst. The 2t / h mixed chlorosilane raw material enters the reaction pre-separation section in the middle of the C\E section. The operating pressure is 0.5MPa, the temperature at the top of the tower is 62°C, and the temperature at the bottom of the tower is 114°C. The liquid phase on both sides of the separator is evenly distr...

example 2

[0025] The clapboard anti-disproportionation reaction rectification comprehensively utilizes 4000 tons / year of dichlorodihydrosilane and 6800 tons / year of silicon tetrachloride.

[0026] Composition of mixed chlorosilane raw materials: DCS:TCS:STC=1:1:1 (molar ratio). The feeding amount of mixed chlorosilane raw materials is 2t / h.

[0027] There are 12 theoretical plates in the A\H section of the clapboard reactive distillation column, 12 theoretical plates in the B\F section, 24 theoretical plates in the D\G section, and four-meter-high reaction plates in the C\E sections. Catalyst, present example selects macroporous anion exchange resin as reaction catalyst for use. The 2t / h mixed chlorosilane raw material enters the reaction pre-separation section in the middle of the C\E section. The operating pressure is 0.2MPa, the temperature at the top of the tower is 30°C, and the temperature at the bottom of the tower is 75°C. The liquid phase on both sides of the separator is ev...

example 3

[0029] The clapboard anti-disproportionation reaction rectification comprehensively utilizes 4000 tons / year of dichlorodihydrosilane and 6800 tons / year of silicon tetrachloride.

[0030] Composition of mixed chlorosilane raw materials: DCS:TCS:STC=1:1:1 (molar ratio). The feeding amount of mixed chlorosilane raw materials is 2t / h.

[0031]There are 12 theoretical plates in the A\H section of the clapboard reactive distillation column, 12 theoretical plates in the B\F section, 24 theoretical plates in the D\G section, and four-meter-high reaction plates in the C\E sections. Catalyst, present example selects macroporous anion exchange resin as reaction catalyst for use. The 2t / h mixed chlorosilane raw material enters the reaction pre-separation section in the middle of the C\E section. The operating pressure is 0.3MPa, the temperature at the top of the tower is 45°C, and the temperature at the bottom of the tower is 90°C. The liquid phase on both sides of the separator is eve...

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Abstract

The invention relates to baffle reaction-rectification equipment and a process for comprehensive utilization of dichlorosilane and silicon tetrachloride. The baffle reaction-rectification equipment comprises a main baffle reaction-rectification tower, an overhead condenser, a bottom reboiler and a bottom material circulating pump. The main reaction-rectification tower is divided into four parts by means of a vertical baffle plate arranged therein: a public rectifying section, a public stripping section, a reaction and pre-separation section and an extraction section, wherein, the reaction andpre-separation section is defined into a B section, a C section, an E section and an F section; the extraction section is defined into a D section and a G section; reaction catalysts are filled in the C section and the E section for reaction and rectification; and other parts are provided with efficient structured packing or a tower plate for rectification and separation. In the invention, trichlorosilane with high application value is prepared by adopting the dichlorosilane and the silicon tetrachloride with lower value, thus improving the application rate of raw materials, and solving the enrichment problem of the dichlorosilane and the silicon tetrachloride. By utilizing the baffle reaction-rectification process, a plurality of towers used in reaction and rectification as well as separation and purification are integrated in one baffle reaction-rectification tower, thus saving equipment investment of the tower, and lowering energy consumption.

Description

technical field [0001] The invention relates to the technical field of reactive distillation and clapboard rectification, in particular to clapboard reactive rectification equipment and the antiproportionation reaction of dichlorodihydrosilane and silicon tetrachloride. Background technique [0002] At present, the polysilicon production process of most enterprises in my country is the improved Siemens method. This process uses trichlorosilane as the raw material for reduction, and some dichlorodihydrogen silicon and a large amount of silicon tetrachloride by-products are produced during the production process. For silicon tetrachloride, there have been methods such as cold hydrogenation to treat it and convert it into trichlorosilane for reuse. However, the domestic cold hydrogenation process is immature, and it has been difficult to master its core technology, with low efficiency and high energy consumption. And the amount of silicon tetrachloride to be treated is very lar...

Claims

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Application Information

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IPC IPC(8): B01D3/14B01J8/00C01B33/107
Inventor 黄国强王国锋王红星华超
Owner TIANJIN UNIV
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