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[Chemical Knowledge]：Manufacturing method and process flow of dimethyl sulfoxide

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Dimethyl sulfoxide (DMSO) is an important raw material for chemical production, which is widely used in medicine, pesticide, chemical industry and other fields. This article will introduce the manufacturing methods of dimethyl sulfoxide, including dimethyl sulfate method, dimethyl sulfide method, etc.

1. dimethyl sulfate method

dimethyl sulfate method is one of the main methods for the production of dimethyl sulfoxide. The starting materials for the process are sulfuric acid, methanol and sulfur dioxide. The specific steps are as follows:

1. mixing methanol and sulfuric acid and reacting under the action of a catalyst to generate dimethyl sulfate;
2. reacting dimethyl sulfate with sodium sulfite to generate sodium dimethylsulfinate and sodium sulfate;
3. reacting sodium dimethylsulfinate with sodium hydroxide to generate dimethyl sulfoxide and sodium sulfite.

The advantages of this method are that the raw materials are easy to obtain, the reaction conditions are mild, and the yield is high. However, a large amount of waste water and waste gas will be produced in the production process, which will cause certain pollution to the environment.

2. dimethyl sulfide method

The dimethyl sulfide method is a relatively new type of dimethyl sulfoxide manufacturing method. The starting materials for this process are dimethyl sulfide and an oxidizing agent such as hydrogen peroxide. The specific steps are as follows:

1. mixing dimethyl sulfide with an oxidant to react to generate dimethyl sulfoxide and hydrogen sulfide;
2. separating dimethyl sulfoxide and unreacted dimethyl sulfide by distillation.

The advantages of this method are high yield, good product quality, and no large amount of waste water and waste gas. However, the raw material cost of this method is high, and a large amount of oxidizing agent is required.

3. other methods

In addition to the above two methods, there are some other methods for manufacturing dimethyl sulfoxide, such as methanol oxidation method, dimethyl ether oxidation method, etc. These methods have their own advantages and disadvantages, and can be selected according to specific production conditions and needs.

4. production process optimization

In order to improve the production efficiency and quality of dimethyl sulfoxide, the production process can be optimized. Specific measures include:

1. Optimize the type and dosage of catalyst to improve the reaction rate and selectivity;
2. Strengthen the sealing and corrosion resistance of the reaction equipment to reduce leakage and pollution in the production process;
3. Adopt advanced Separation technology to improve product purity and yield.

In short, the manufacturing method of dimethyl sulfoxide needs to be selected according to specific production conditions and needs, and at the same time, it needs to pay attention to environmental protection and economic benefits. Through the optimization and improvement of the production process, the production efficiency and quality of dimethyl sulfoxide can be further improved.

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