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Preparation method for preparing octamethylcyclotetrasiloxane by using liquid methane

A technology of octamethylcyclotetrasiloxane and liquid methane, which is applied in the field of preparation of octamethylcyclotetrasiloxane from liquid methane, and achieves the effects of making up for gaps in the market, simple processing, and reasonable design

Inactive Publication Date: 2018-12-28
芜湖维软新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing market, there is no case of using methane to directly prepare. Now in order to make up for the gap in the market, the inventor has developed a processing method for utilizing methane to develop octamethylcyclotetrasiloxane, in order to fill market blank

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] The first step: first use the gas collection device to collect a certain unit of methane (CH4) gas, and compress the gaseous methane (CH4) gas into liquid methane (CH4) through a hydraulic tank;

[0022] Step 2: Put liquid methane (CH4) in the electrolytic cell, add sodium hydroxide (NaOH) electrolyte in the electrolytic cell, and then feed oxygen (O2) to electrolyze the liquid methane (CH4) into methanol (CH3OH), as follows:

[0023] CH4 + O2 → CH3OH

[0024] Step 3: Add the electrolyzed methanol (CH3OH) into the hydrogen chloride (HCL) solution, and heat it to 45°C-60°C to generate a mixture of chloromethane (CH3CL). ) filtered out as follows:

[0025] CH3OH + HCL → CH3CL + H2O

[0026] Step 4: Add silicon to the filtered monochloromethane (CH3CL) liquid, and at a temperature of 265°C-285°C, generate dichlorosilyldimethane ((CH3)SiCl2), and filter through Remove the solid residue remaining in the dichlorosilane ((CH3)2SiCl2) liquid as follows:

[0027] CH3Cl + Si...

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Abstract

The invention provides a preparation method for preparing octamethylcyclotetrasiloxane by using liquid methane. The preparation method includes first compressing gaseous methane gas into the liquid methane by using a hydraulic tank; placing the liquid methane into an electrolytic cell and introducing oxygen to electrolyze the liquid methane into methanol; then adding the electrolyzed methanol to ahydrogen chloride solution to form methyl chloride; then adding silicon in the filtered methyl chloride liquid to generate dichlorosilane; conducting filtering to remove solid residue remaining in the dichlorosilane liquid; finally adding the dichlorosilane dropwise into the water, layering, discharging acid water, hydrolyzing grease with a sodium hydroxide solution, adding a hydrolysate and 0.5%-2% potassium hydroxide to a cracking kettle for cracking under vacuum, fractionating the lysate and collecting a distillate at 173-176 DEG C to obtain octamethylcyclotetrasiloxane. According to the preparation method, the octamethylcyclotetrasiloxane is prepared by using the methane, so that the cost can be reduced. The preparation method makes up for the blank of the market, and is suitable forpromotion.

Description

technical field [0001] The present invention mainly relates to the technical field of octamethylcyclotetrasiloxane, in particular to a preparation method for utilizing liquid methane to prepare octamethylcyclotetrasiloxane. Background technique [0002] Octamethylcyclotetrasiloxane (D4), colorless transparent or milky white liquid, flammable, no peculiar smell, is a kind of product obtained by hydrolysis synthesis of dimethyldichlorosilane, separated and rectified obtained compound. It is an important intermediate in the silicone industry. The main uses include preparation of silicone polymers such as methyl silicone oil, insulation and moisture resistance of radio parts, surface deactivation agent for gas chromatography glass capillary columns, etc. In the existing market, there is no case of using methane to directly prepare. Now in order to make up for the gap in the market, the inventor has developed a processing method for utilizing methane to develop octamethylcyclot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/21C25B3/02C25B3/23
CPCC07F7/21C25B3/23
Inventor 曹宇
Owner 芜湖维软新材料有限公司