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[Chemical Knowledge]：Manufacturing method and process of DAA

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DAA (dialkyl adipate) manufacturing method

DAA, also known as dialkyl adipate, is an important chemical raw material, widely used in plastics, fibers, lubricating oil additives and other fields. The following is about the manufacturing method of DAA.

1. Raw Material Preparation

The main raw materials for the manufacture of DAA are adipic acid and alcohols. Commonly used alcohols include methanol, ethanol, propanol, etc. Before starting manufacturing, you need to ensure that the purity and quality of the raw materials meet the production requirements.

2. Esterification Reaction

adipic acid and alcohol compounds are added into a reaction kettle according to a certain molar ratio, heated to a certain temperature, and a catalyst is added to carry out esterification reaction. The esterification reaction is a reversible reaction, and it is necessary to control the reaction conditions to make the reaction proceed in the direction of DAA. In general, the reaction temperature needs to be between 100 and 200 ° C., and the reaction time needs to vary from several hours to several tens of hours.

3. Separation and Purification

After the reaction, the reaction mixture needs to be separated and purified to obtain a high purity DAA product. Common separation methods include distillation, extraction, crystallization, etc. Among them, distillation is the most commonly used method, and DAA can be separated from unreacted raw materials and other by-products by distillation.

4. Quality Inspection

The separated and purified DAA products need to be inspected to ensure that their purity, color, acidity and other indicators meet the production requirements. Commonly used inspection methods include gas chromatography, mass spectrometry, titration, etc.

above is the basic manufacturing method of DAA, but the specific production process may be different due to different manufacturers, equipment conditions, raw material sources and other factors. In addition, it is necessary to pay attention to safety in the production process to avoid safety accidents caused by high temperature, high pressure and other conditions.

In short, the manufacture of DAA requires certain chemical knowledge and skills, as well as strict compliance with production processes and safety procedures to ensure product quality and production safety.

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