Unlock instant, AI-driven research and patent intelligence for your innovation.

Silicon tetrachloride reduction method of dechlorination hydrogenation technology and preparation method of copper-silicon alloy catalyst containing Cu-Si metallic bond

A technology of silicon tetrachloride and metal bonds, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, silicon halide compounds, etc., can solve the problem of loss of catalytic activity of silicon-copper alloy catalysts and other problems , to avoid microcohesion and increase catalytic life

Active Publication Date: 2016-03-30
新疆硅基新材料创新中心有限公司
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive cuprous chloride will reduce the silicon-copper alloy to metallic copper and deposit on the surface of the active point, resulting in the loss of the catalytic activity of the silicon-copper alloy catalyst

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Silicon tetrachloride reduction method of dechlorination hydrogenation technology and preparation method of copper-silicon alloy catalyst containing Cu-Si metallic bond

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment provides a method for preparing a copper-silicon alloy catalyst containing Cu-Si metal bonds for the reduction of silicon tetrachloride in the dechlorination and hydrogenation process, comprising the following steps:

[0050] (1) Cuprous chloride and silicon powder are sent to the deposition part of the fluidized bed reactor in the fluidized bed reactor, wherein, the particle diameter of cuprous chloride is 300 orders, and the particle diameter of silicon powder is chlorinated 100 times of cuprous particle size, the added amount of cuprous chloride is 0.3wt% of the added amount of silicon powder.

[0051] (2) Nitrogen is introduced into the fluidized bed reactor through the delivery gas introduction pipe, and the heating temperature is 200 ° C, so that the mixed powder is in a fluidized state; wherein, the nitrogen flow rate in the fluidized bed reactor is 0.5m / s, the porosity is 0.45. Fluidization reaction occurs by heating in the fluidized bed, the h...

Embodiment 2

[0057] This embodiment provides a method for preparing a copper-silicon alloy catalyst containing Cu-Si metal bonds for the reduction of silicon tetrachloride in the dechlorination and hydrogenation process, comprising the following steps:

[0058] (1) Cuprous chloride and silicon powder are sent to the deposition part of the fluidized bed reactor in the fluidized bed reactor, wherein, the particle diameter of cuprous chloride is 280 orders, and the particle diameter of silicon powder is chlorinated 30 times of cuprous particle diameter, the addition amount of cuprous chloride is 0.5wt% of the addition amount of silicon powder.

[0059] (2) Argon gas is passed into the fluidized bed reactor through the delivery gas introduction pipe, and the heating temperature is 250°C to form a fluidized bed; wherein, the argon gas flow rate in the fluidized bed reactor is 2m / s, and the pores The rate is 0.5. Fluidization reaction occurs by heating in the fluidized bed, the heating temperat...

Embodiment 3

[0061] This embodiment provides a method for preparing a copper-silicon alloy catalyst containing Cu-Si metal bonds for the reduction of silicon tetrachloride in the dechlorination and hydrogenation process, comprising the following steps:

[0062] (1) Cuprous chloride and silicon powder are sent to the deposition part of the fluidized bed reactor in the fluidized bed reactor, wherein, the particle diameter of cuprous chloride is 250 orders, and the particle diameter of silicon powder is chlorinated 70 times of cuprous particle diameter, the addition amount of cuprous chloride is 0.4wt% of the addition amount of silicon powder.

[0063] (2) The mixed gas of nitrogen and helium is passed into the fluidized bed reactor through the delivery gas introduction pipe, and the heating temperature is 300°C to form a fluidized bed; wherein, the nitrogen and helium in the fluidized bed reactor The flow rate of the mixed gas is 2.5m / s, and the porosity is 0.53. Fluidization reaction occur...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention discloses a silicon tetrachloride reduction method of a dechlorination hydrogenation technology and a preparation method of a copper-silicon alloy catalyst containing a Cu-Si metallic bond, the preparation method comprises the following steps: (1) cuprous chloride and silicon powder are fed into a fluidized bed reactor; and (2) a heated non-reducing gas is introduced into the fluidized bed reactor, so that a mixture of the silicon powder and the cuprous chloride exhibits a fluidized state, cuprous chloride reduction and phase-forming reactions can be performed in the fluidized bed reactor, and the silicon tetrachloride reduction copper-silicon alloy catalyst containing the Cu-Si metallic bond can be obtained on the surface of silicon powder particles. The catalyst prepared by the method can avoid the catalyst micro bonding effect, and can keep a highly active state in long term, and silicon tetrachloride reducing conversion rate can be increased to 25-30% mol.

Description

technical field [0001] The invention belongs to the technical field of producing trichlorosilane from silicon tetrachloride, and in particular relates to a method for reducing silicon tetrachloride in a dechlorination and hydrogenation process and a method for preparing a copper-silicon alloy catalyst containing Cu-Si metal bonds. Background technique [0002] Polysilicon is the basic material of the solar photovoltaic industry. 75-80% of polysilicon in the world is produced by the improved Siemens method. There will be about 16 tons of by-product silicon tetrachloride generated. [0003] At present, the silicon tetrachloride (STC) dechlorination and hydrogenation process adopted by domestic polysilicon manufacturers is carried out in a fluidized bed reactor. Since the reaction conditions of monovalent copper and silicon and / or hydrogen are milder than divalent copper, the reaction temperature Low, so choose monovalent CuCl as catalyst. Absolutely dry CuCl is a white powde...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72C01B33/107
Inventor 郭增昌刘兴平吕学谦刘乐通
Owner 新疆硅基新材料创新中心有限公司