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Method for producing trichlorosilane by continuously adding silicon powder

A technology of trichlorosilane and silicon powder, applied in the directions of halogenated silanes and halogenated silicon compounds, etc., can solve problems such as inability to achieve, and achieve the effect of improving utilization rate, reducing labor intensity, and realizing continuity.

Active Publication Date: 2011-08-31
江西宏柏新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned technical scheme can effectively separate and collect trichlorosilane and silicon tetrachloride, because the raw material liquid of trichlorosilane contains dichlorodihydrosilane, its boiling point is lower than that of trichlorosilane, so in 1# refined The trichlorosilane extracted from the gas phase of the distillation tower must contain dichlorodihydrosilane. Although it is proposed in the application documents that its purity reaches 99.9%, in theory, the above equipment and methods cannot be realized.

Method used

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  • Method for producing trichlorosilane by continuously adding silicon powder
  • Method for producing trichlorosilane by continuously adding silicon powder
  • Method for producing trichlorosilane by continuously adding silicon powder

Examples

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Effect test

Embodiment 1

[0072] Such as figure 1 Shown a kind of method that continuously adds silicon powder to produce trichlorosilane, comprises the steps:

[0073] A. After adding the silicon powder to the two dryers, dry it with dry nitrogen at 150°C for 5.5 hours, and the pressure inside the dryer is 0.2MPa; the two dryers are used alternately for drying and feeding respectively, so as to ensure the continuous supply of raw materials sex.

[0074] B, the control system is combined with the productive rate of trichlorosilane, first with silicon powder: the molar ratio of hydrogen chloride is 5: 16 feeding 10 minutes, then is 5: 19 feeding 10 minutes with the molar ratio again, two kinds of ratios are fed The materials are alternately circulated while maintaining the molar ratio of silicon powder and trichlorosilane produced at 6:5. The DCS control system adjusts the rotation speed of the motor according to the yield of trichlorosilane in the synthesis furnace and the feed amount of hydrogen chl...

Embodiment 2

[0082] Compared with Example 1, the only difference is that this example does not include rectification and purification of trichlorosilane (without steps D and E). In addition, step A is: after adding silicon powder to two dryers, Dry with dry nitrogen at 140°C for 5 hours, and the pressure inside the dryer is 0.18MPa;

Embodiment 3

[0084] Compared with Example 1, the only difference is that step A is: after adding silicon powder into two dryers, dry with dry nitrogen at 160°C for 6 hours, and the pressure inside the dryer is 0.25MPa;

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Abstract

The invention relates to a method for producing trichlorosilane by continuously adding silicon powder, comprising the following steps: adding the silicon powder to a dryer, and drying the silicon powder for 5-6 hours by using dry nitrogen at 140-160 DEG C; controlling the dried silicon powder and hydrogen chloride to be fed into a synthesis furnace at the molar ratio of (1:3)-(1:4) by a control system; causing the silicon powder and the hydrogen chloride to be subject to gas-solid phase reaction in the synthesis furnace; removing the dust of discharge from the synthesis furnace by a cyclone separator and a silicon dust filter, recovering residual silicon dust and feeding the discharge to a synthesis gas pressurizing and condensing system; and feeding condensed raw material solution to distillation towers for three-level distillation, and separating to obtain the trichlorosilane with the purity of over 99.9 percent. According to the invention, the technical problems existing in the prior art that the continuous production can not be realized and the content of the byproduct is too high are solved; and the production efficiency and production safety stability of the device as well as the yield and purity of the trichlorosilane are greatly improved.

Description

technical field [0001] The invention relates to a method for producing trichlorosilane, in particular to a method for continuously adding silicon powder to produce trichlorosilane. Background technique [0002] Trichlorosilane is an important raw material for the production of organosilane coupling agents. Synthetic reaction of trichlorosilane with vinyl chloride or propylene chloride, and then purified by rectification to obtain vinyl or propenyl series silane coupling agent products. Silane coupling agents can be crosslinked with almost any kind of material, including thermosetting materials, thermoplastic materials, sealants, rubber, hydrophilic polymers and inorganic materials, etc., in solar cells, glass fibers, reinforced resins, precision ceramic fibers and Optical fiber protective film and other aspects play an important role and play an indispensable and important role in these industries. The prior art discloses some technical schemes for the synthesis of trichlor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/107
Inventor 郎丰平邱顺恩黄少辉黄小明李明生
Owner 江西宏柏新材料股份有限公司