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Method for preparing methyl silicate and aluminum fluoride from silicon tetrafluoride and methanol

A technology of silicon tetrafluoride and methyl silicate, applied in the chemical industry, can solve problems such as unreasonable utilization of silicon tetrafluoride, achieve high environmental value and economic value, simple steps, and economical and reasonable effects

Active Publication Date: 2013-04-24
云天化集团有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the existing technical defects of unreasonable utilization of silicon tetrafluoride, and to provide a method of using silicon tetrafluoride, a by-product of phosphate fertilizer enterprises, to carry out alcoholysis to prepare high value-added methyl silicate and aluminum fluoride products, and the process will not produce difficult-to-handle waste that pollutes the environment, a method that can efficiently use phosphate fertilizers to produce by-product silicon tetrafluoride

Method used

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  • Method for preparing methyl silicate and aluminum fluoride from silicon tetrafluoride and methanol

Examples

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Embodiment 1

[0020] 1040 g of silicon tetrafluoride methanol solution with a mass fraction of 10% and 50 g of aluminum powder with a particle size of 75 microns were added to the synthesis reactor, and the temperature was gradually raised to 30 °C for 6 hours of reaction. After the reaction was completed, the product was subjected to vacuum filtration to obtain a solid and a filtrate. The solid was washed with anhydrous methanol to obtain the target product anhydrous aluminum fluoride. The excess methanol was distilled off from the filtrate to obtain methyl silicate with a high boiling point.

Embodiment 2

[0022] 434 g of silicon tetrafluoride methanol solution with a mass fraction of 24% and 50 g of aluminum powder with a particle size of 13 microns were added to the synthesis reactor, and the temperature was gradually raised to 30 °C for 1 h of reaction. After the reaction was completed, the product was subjected to vacuum filtration to obtain a solid and a filtrate. The solid was washed with anhydrous methanol to obtain the target product anhydrous aluminum fluoride. The excess methanol was distilled off from the filtrate to obtain methyl silicate with a high boiling point.

Embodiment 3

[0024] 743 g of silicon tetrafluoride methanol solution with a mass fraction of 14% and 50 g of aluminum powder with a particle size of 75 microns were added to the synthesis reactor, and the temperature was gradually raised to 30 °C for 6 hours of reaction. After the reaction was completed, the product was subjected to vacuum filtration to obtain a solid and a filtrate. The solid was washed with anhydrous methanol to obtain the target product anhydrous aluminum fluoride. The excess methanol was distilled off from the filtrate to obtain methyl silicate with a high boiling point.

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Abstract

The invention relates to the technical field of chemical industry, and in particular relates to a method for preparing methyl silicate and aluminum fluoride from silicon tetrafluoride and methanol, which comprises the following steps of: a, adding a prepared alcohol solution of silicon tetrafluoride and aluminum powder to a synthesis reactor; b, raising the temperature of the reactor to a predetermined temperature reaction; c, after the reaction is finished, carrying out vacuum filtration on a product to separate solid and liquid; d, cleaning the solid obtained in the step c by methanol and drying to obtain a target product, namely anhydrous aluminum fluoride; and e, carrying out distillation on the filtrate obtained in the step c to remove methanol and obtaining methyl silicate with a high boiling point. The method for preparing methyl silicate and aluminum fluoride by silicon tetrafluoride and methanol related by the invention can efficiently and comprehensively utilize fluorine and silicon resources in by-products of phosphate fertilizer enterprises.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a method for preparing methyl silicate and anhydrous aluminum fluoride by using silicon tetrafluoride gas for alcoholysis, especially for the high efficiency and high efficiency of fluorine and silicon resources in the by-products of phosphate fertilizer enterprises. The method of comprehensive utilization of benefits. [0002] Background technique [0003] Methyl silicate mainly appeared as an intermediate raw material for organic synthesis, and was rarely circulated as a commodity in the past, which was related to the small scale of its downstream industry. In recent years, with the development of industry, methyl silicate has been industrialized in the production of heat-resistant and chemical-resistant coatings, silicone solvents and adhesives for precision casting, as well as insulating materials for the electronics industry, optical glass treatment agents and coagulants....

Claims

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Application Information

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IPC IPC(8): C07F7/04C01F7/50
Inventor 黄忠李侠李玉叶田强梁雪松
Owner 云天化集团有限责任公司
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