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[Chemical Knowledge]：Production method and process flow of high purity dimethyl carbonate

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The manufacturing method
of high purity dimethyl carbonate
1. Introduction

High purity dimethyl carbonate is an important raw material for chemical production, which is widely used in medicine, pesticide, plastic, fuel and other fields. With the continuous development of science and technology, the manufacturing method of high-purity dimethyl carbonate has been continuously optimized. This article will introduce an efficient and environmentally friendly high-purity dimethyl carbonate manufacturing method.

2. Materials and Methods

1. Material

methanol, carbon dioxide, catalyst (such as sulfuric acid, sodium methoxide, etc.), dehydrating agent (such as molecular sieve, silica gel, etc.), refined solvent (such as ethanol, acetone, etc.).

2. Equipment

reactors, distillation columns, storage tanks, pumps, valves, etc.

3. manufacturing method

(1) methanol and carbon dioxide reaction

methanol and carbon dioxide are mixed according to a certain proportion, into the reactor, under the action of catalyst, esterification reaction is carried out to generate dimethyl carbonate. It is necessary to control the temperature, pressure and other parameters in the reaction process to ensure the smooth progress of the reaction.

(2) Dehydration Treatment
After completion of the
reaction, the reaction solution is subjected to dehydration treatment to remove moisture therein. Dehydration can be carried out using molecular sieve, silica gel and other dehydrating agents to ensure the purity of the product.

(3) Rectification and purification

The dehydrated dimethyl carbonate is subjected to rectification and purification to obtain a high-purity product. In the distillation process, it is necessary to control the parameters such as the temperature of the tower and the reflux ratio to ensure the quality and yield of the product.

(4) Quality inspection and packaging

carries out quality inspection on the purified high-purity dimethyl carbonate, including purity, moisture, acidity and other indicators. After passing the test, package and store for storage.

3. Results and Discussion

1. Results

The purity of high purity dimethyl carbonate produced by this method can reach more than 99.9%, and the moisture, acidity and other indicators are in line with national standards. The yield of the product is higher and the production cost is lower.

2. Discussion

In the manufacturing process, it is necessary to strictly control the parameters of each link to ensure the quality and yield of the product. At the same time, it is necessary to pay attention to safe production and prevent accidents. In addition, attention should be paid to the treatment of waste gas, and environmental protection measures should be taken to reduce the impact on the environment.

4. Conclusion

This method is an efficient and environmentally friendly method for the manufacture of high purity dimethyl carbonate with high product quality and yield. In actual production, the process parameters can be adjusted and optimized according to the specific situation to further improve production efficiency and reduce costs. At the same time, it is necessary to strengthen production safety management and environmental protection management to ensure the smooth progress of the production process and minimize the impact on the environment.

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