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[Chemical Knowledge]：DMF(N,N-dimethylformamide) production method and process flow

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Manufacturing Method
of DMF(N,N-Dimethylformamide)
DMF is a common raw material for chemical production, which is widely used in medicine, pesticide, synthetic fiber, plastic, solvent and other fields. The following is the manufacturing method of DMF:

1. formic acid method

formic acid method is the main method of producing DMF at home and abroad, and its route is the reaction of formic acid and dimethylamine to generate dimethylformamide. The specific steps are as follows:

1. Formic acid and dimethylamine are added into a reactor according to a certain proportion, and the reaction temperature is controlled between 60-80 ° C. to react to generate dimethylformamide and water.
2. The reaction solution was distilled to separate unreacted formic acid and dimethylamine to obtain crude DMF.
3. The crude DMF is refined to remove water and other impurities to obtain pure DMF product. The advantages of

formic acid method are mature process, simple operation and low cost, but the disadvantage is that the water generated by the reaction needs to be treated and the equipment is easy to be corroded.

2. methanol method

methanol method is another method for producing DMF, and its process route is that methanol and dimethylamine react under the action of a catalyst to generate dimethylformamide and hydrogen. The specific steps are as follows:

1. methanol and dimethylamine are added into a reactor according to a certain proportion, a catalyst is added, the reaction temperature is controlled between 200 and 300 ° C., and the reaction generates dimethylformamide and hydrogen.
2. The reaction product was cooled and separated to obtain crude DMF and hydrogen.
3. The crude DMF is purified to remove impurities and obtain pure DMF product. The advantage of the

methanol method is that the reaction conditions are relatively mild, and the hydrogen generated by the reaction can be used as energy, but the disadvantage is that a catalyst is required and the equipment investment is large.

3. acetic acid method

acetic acid method is a more traditional method for the production of DMF, the process route is the reaction of acetic acid and dimethylamine to produce dimethylformamide and ethylamine. The specific steps are as follows:

1. Acetic acid and dimethylamine are added into a reactor according to a certain proportion, and the reaction temperature is controlled between 100 and 150 ° C. to react to generate dimethylformamide and ethylamine.
2. The reaction solution was distilled to separate unreacted acetic acid and dimethylamine to obtain crude DMF.
3. The crude DMF was purified to remove ethylamine and other impurities to obtain pure DMF product. The disadvantages of the

acetic acid method are that the reaction to form ethylamine requires handling and the yield is low, so it is now less used.

In short, the above three methods can be used to produce DMF. The advantages and disadvantages of different methods are different, and the suitable production method can be selected according to the actual situation.

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