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

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of Manufacturing Method
of N,N-Dimethylformamide (DMF) N,N-Dimethylformamide (DMF) is a commonly used raw material for chemical production and has a wide range of applications. This paper will introduce the manufacturing method of DMF, including raw materials, process flow, reaction principle, equipment, operation steps, control mode, safety production, environmental protection requirements and so on.

1. raw material

DMF manufacturing raw materials are mainly formic acid, dimethylamine and methanol. Among them, formic acid and dimethylamine in the reaction to produce dimethylformamide, methanol as a solvent and catalyst to participate in the reaction.

2. Process
The manufacturing process of
DMF mainly includes the following steps:

1. Formic acid, dimethylamine and methanol are added to the reactor in a certain proportion.

2. at a certain temperature, the reaction, DMF and water.

3. Methanol and water were separated by distillation to give crude DMF.

4. The crude DMF was purified to obtain DMF product with high purity.

3. reaction principle

DMF production reaction principle is as follows:

HCOOH (CH3)2NH → HCOOCH3 (CH3)2N-H

formic acid and dimethylamine react to generate methyl formate and dimethylamine salt, and dimethylamine salt reacts with methyl formate to generate DMF and water.

4. equipment

The manufacture of DMF requires the use of reactors, distillation columns, distillation columns, storage tanks and other equipment. Among them, the reactor needs to have the functions of stirring, heating, cooling and the like to ensure the smooth progress of the reaction.

5. operation steps

DMF production operation steps are as follows:

1. Formic acid, dimethylamine and methanol are added into the reactor in a certain proportion, and the stirring and heating device are started.

2. Control the reaction temperature to keep the reaction stable.

3. When the reaction was completed, the heating and stirring were stopped and the reaction liquid was transferred to a distillation column.

4. Methanol and water were separated by distillation to give crude DMF.

5. The crude DMF is transferred to a distillation column for purification to obtain a DMF product with high purity.

6. control method

DMF manufacturing process, it is necessary to monitor and control the reaction temperature, pressure, liquid level and other parameters to ensure the stability of the reaction and the quality of the product. At the same time, it is also necessary to control the quality and ratio of raw materials to avoid the impact on the reaction and product quality. Commonly used control methods include manual control, automatic adjustment and computer control.

7. safety production

In the DMF manufacturing process, it is necessary to pay attention to safety production and take corresponding measures to prevent accidents. For example, in the design and operation of the reactor, it is necessary to consider factors such as explosion-proof and leakage-proof to ensure the safety and reliability of the equipment; during the transportation and storage of raw materials, it is necessary to pay attention to fire-proof, explosion-proof and other measures to ensure the safety of production.

8. environmental protection requirements The manufacturing process of

DMF will produce certain pollutants such as waste gas, waste water and solid waste. These pollutants need to be treated and discharged to meet environmental protection requirements. At the same time, it is necessary to take energy-saving and emission-reduction measures in the production process to reduce energy consumption and resource consumption and improve the economic and environmental benefits of enterprises.

In short, the manufacture of N,N-dimethylformamide (DMF) requires knowledge of the corresponding raw materials, process flow, reaction principle, equipment, operation steps, control methods, safety production and environmental protection requirements to ensure product quality and production safety and environmental protection.

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