Method for preparing silicon tetrafluoride

A silicon tetrafluoride and powder technology, which is applied in the production field of silicon tetrafluoride, can solve the problems of high purchasing cost of fluorite and rising cost of silicon tetrafluoride, and achieve the effect of reducing production cost.

Active Publication Date: 2009-09-30
YINGLI ENERGY CHINA
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Problems solved by technology

Because a large amount of fluorite powder is used as a raw material in the raw material of this method, and the purchase cost of fluorite is high, this method will increase the cost of preparing silicon tetrafluoride for enterprises

Method used

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  • Method for preparing silicon tetrafluoride
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preparation example Construction

[0037] During the preparation of silane, a large amount of by-product NaAlF is produced 4 , in order to effectively resolve the by-product NaAlF 4 and reduce the production cost of silicon tetrafluoride, the present invention will include by-product NaAlF 4 The raw material, Si source and sulfuric acid are reacted to obtain silicon tetrafluoride. For NaAlF 4 , can also be prepared by other methods, and the present invention is not particularly limited.

[0038] In addition, it can also be found in the by-product NaAlF 4 Mix other F-containing materials in the mixture as raw materials for preparing silicon tetrafluoride, and other F-containing raw materials can be one or more of calcium fluoride, sodium fluoride, and sodium silicofluoride.

[0039] Select NaAlF 4 powder as a raw material, in order to facilitate the reaction, the preferred particle size is 50 mesh to 300 mesh NaAlF 4 Powder as raw material, more preferably, NaAlF 4 The particle size of the powder is prefe...

Embodiment 1

[0065] Dilute sodium aluminum hydride with dimethyl ether to a concentration of about 10%, then react with silicon tetrafluoride at a temperature of 50°C and a pressure of 0.1MPa, and collect the by-product NaAlF 4 , after drying, measure the collected NaAlF 4 The purity of 96.2% by weight, then the NaAlF 4 Grind until the particle size is 100 mesh to 150 mesh and set aside.

[0066] Weigh NaAlF 4 2.52 kg and 1.2 kg of silica powder with a particle size of 100 mesh to 150 mesh and a purity of 98% by weight are sent to a mixer and mixed, and stirred evenly;

[0067] The mixture obtained after mixing is sent to a calciner for a calcining reaction to form a complex, the calcining temperature is 300°C, and the calcining time is 20 minutes;

[0068] Load the calcined product into the reaction furnace (full volume is 0.08m 3 ), and then adding 3.92kg of concentrated sulfuric acid with a concentration of 98% by weight to react with the calcined product, the temperature of the rea...

Embodiment 2

[0070] Get the NaAlF that embodiment 1 prepares 42.52 kg and 1.2 kg of silica powder with a particle size of 100 mesh to 150 mesh and a purity of 98% by weight are sent to a mixer and mixed, and stirred evenly;

[0071] The mixture obtained after mixing is sent to a calcination furnace for calcination to form a complex, the calcination temperature is 290°C, and the calcination time is 20 minutes;

[0072] Load the calcined product into the reaction furnace (full volume is 0.08m 3 ), then add 3.92kg of concentrated sulfuric acid with a concentration of 98% by weight in the reaction furnace, heat the reaction furnace to a temperature of about 310°C for reaction, collect and dry the silicon tetrafluoride generated and process it, after calculation, generate tetrafluoroethylene The conversion rate of silicon dioxide was 96.8%, and the purity of silicon tetrafluoride was 99.8% by weight.

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Abstract

The present invention discloses a method for preparing silicon tetrafluoride, including a) mixing a raw material powder containing NaAlF4 and Si source powder; b) heating the mixture of the step a) with sulfuric acid to 240 DEG C to 350 DEG C to react to obtain silicon tetrafluoride. The silicon tetrafluoride is prepared by a reaction of the raw material containing NaAlF4 powder and Si source and sulfuric acid under a heating condition, comparing with the present technology, it is not only capable of avoiding to use a great amount of fluorite to prepare the silicon tetrafluoride, which reduces cost, it is also capable of using the accessory substances NaAlF4 generated during a process for producing the silicone hydride effectively, and preparing the silicon tetrafluoride with a high percent conversion.

Description

technical field [0001] The invention relates to silicon tetrafluoride, in particular to a method for producing silicon tetrafluoride. Background technique [0002] Silicon tetrafluoride, also known as tetrafluorosilane, its molecular formula is SiF 4 , has many uses, for example: 1) Silicon tetrafluoride can be used to treat dry concrete parts, which can improve the water resistance, corrosion resistance and wear resistance of concrete. 2) Silicon tetrafluoride can also be used to provide the hydrophobic properties of crystalline molecular sieves. 3) High-purity silicon tetrafluoride is an important raw material in the electronics industry and is widely used in optical fibers, semiconductors or solar cells. [0003] In the prior art, a variety of methods for preparing silicon tetrafluoride have been disclosed, among which using fluorite as a raw material to prepare silicon tetrafluoride is the most original method. Fluorite powder ore and quartz sand are used as the main ...

Claims

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Application Information

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IPC IPC(8): C01B33/107
Inventor 张月和薛明李青娟蔡春立王伟
Owner YINGLI ENERGY CHINA
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