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[Chemical Knowledge]：Manufacturing method and process flow of silicone DMC

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The manufacturing method
of silicone DMC
1. Introduction

Silicone dimethyl cyclo-siloxane (DMC) is an important raw material for the production of chemical products, widely used in silicone oil, silicone rubber, silicone resin and other fields. With the continuous development of silicone products, the manufacturing method of DMC has become a research hotspot. This article will introduce a common silicone DMC manufacturing method.

2. raw materials and equipment

1 raw materials: methanol, silica, catalyst (generally acidic catalyst, such as sulfuric acid, hydrochloric acid, etc.).
2. Equipment: reaction kettle, condenser, fractionating tower, storage tank, etc.

3. manufacturing steps

1. methanol and silica are added into a reaction kettle according to a certain proportion and heated to a certain temperature.
2. Add a catalyst and stir for a certain period of time to allow methanol and silica to react fully to generate a mixture of methylchlorosilanes.
3. The mixture of methyl chlorosilanes is subjected to fractional distillation to separate components with different boiling points to obtain DMC.

4. Precautions

1. Control the reaction temperature and reaction time to avoid excessive reaction or insufficient reaction.
2. The amount of catalyst should be appropriate, too much or too little will affect the reaction effect.
3. Maintain proper pressure and temperature during fractionation to avoid DMC decomposition or loss.

5. Advantages and Disadvantages

The method uses common raw materials and equipment, simple operation, low cost, suitable for large-scale production. However, this method also has some shortcomings, such as the production process will produce a certain amount of waste gas and wastewater, which need to be treated; at the same time, there will be a certain loss of DMC in the fractionation process.

6. conclusion

silicone DMC manufacturing method is varied, the method introduced in this paper is a common production method, has the advantages of simple, low cost, but there are some shortcomings. In the actual production process, the appropriate manufacturing method can be selected according to the specific situation to improve production efficiency and quality. At the same time, with the continuous improvement of environmental awareness, the manufacture of silicone DMC also needs to pay more attention to environmental protection and sustainable development, and constantly explore new environmental protection production processes and technologies to reduce the impact on the environment in the production process.

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