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[Chemical Knowledge]：N,N-dimethylacetamide (DMAC) production method and process flow

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N,N-dimethylacetamide (DMAC) is an important organic chemical raw material, which is widely used in medicine, pesticide, synthetic fiber, plastic, rubber and other fields. This article will introduce the manufacturing method of DMAC, including raw material preparation, reaction process, post-treatment and other steps.

1. Raw Material Preparation

The main raw materials for the manufacture of DMAC are dimethylamine and acetic anhydride. Dimethylamine is a colorless and transparent liquid with a strong ammonia odor and is easily soluble in water, ethanol and ether. Acetic anhydride is a colorless, transparent liquid with a pungent odor, soluble in water, ethanol and ether.

2. reaction process

1. dimethylamine and acetic anhydride according to a certain molar ratio into the reactor, the general molar ratio of dimethylamine and acetic anhydride is 1:1.1-1.2.
2. At a certain temperature, start stirring to mix dimethylamine and acetic anhydride thoroughly.
3. A large amount of heat is generated during the reaction, and the reaction temperature needs to be controlled by cooling water or chilled brine to keep the reaction temperature within a certain range.
4. After completion of the reaction, the reaction solution was allowed to stand for a while to separate DMAC from the aqueous layer.

3. post-treatment

1. the isolated crude DMAC product is distilled to obtain DMAC product with high purity.
2. Unreacted raw materials and by-products can be recovered by treating the distillation residue.

4. precautions

1. During the manufacturing process, pay attention to controlling the reaction temperature and pressure to avoid overheating and overpressure.
2. A large amount of irritating gas will be produced during the reaction, and ventilation and protective measures are required.
3. In the process of post-treatment, pay attention to the safety of operation, avoid scalding and contact with irritating substances.

In short, manufacturing DMAC requires a certain amount of chemical knowledge and skills, as well as safety and environmental protection requirements. Only by constantly summing up experience in actual operation can we improve manufacturing efficiency and product purity, and create greater economic and social benefits for enterprises.

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