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[Chemical Knowledge]：Production and manufacturing method and process flow of dibasic acid diol

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The manufacturing method
of dibasic acid diols
1. Introduction

dibasic acid diols are a kind of important chemical production raw materials, widely used in plastics, coatings, adhesives, fibers and other fields. Common dibasic acid diols include ethylene glycol adipate, ethylene glycol terephthalate, etc. This paper will introduce the manufacturing method of dibasic acid diols, focusing on its production process, reaction principle and operation points.

2. production process

1. esterification reaction

dibasic acid and diol in the role of catalyst, esterification reaction to generate dibasic acid ester. Commonly used catalysts include sulfuric acid, phosphoric acid, and the like. In order to ensure the smooth progress of the reaction, it is necessary to control the temperature, pressure and material ratio during the reaction.

2. Polycondensation reaction

dibasic acid ester is polycondensed at high temperature and high vacuum to generate dibasic acid diol polymer. The polycondensation reaction needs to control the reaction temperature, vacuum degree and reaction time to obtain the dibasic acid diol product with high molecular weight and low volatility.

3. reaction principle

1. esterification reaction principle

under the action of the catalyst, dibasic acid and diol esterification reaction, the generation of dibasic acid ester and water. The esterification reaction is a reversible reaction and requires the use of an excess of diol to ensure the reaction proceeds. At the same time, the presence of the catalyst can reduce the activation energy of the reaction and increase the reaction rate.

2. principle of polycondensation reaction

dibasic acid ester polycondensation reaction under high temperature and high vacuum degree to generate dibasic acid diol polymer and water. The polycondensation reaction is an irreversible reaction that pushes the reaction in the direction of producing high molecular weight polymers by constantly removing the produced water.

4. operation points

1. control temperature

in the esterification reaction and polycondensation reaction, need to strictly control the temperature to ensure the smooth progress of the reaction. Too high a temperature may lead to side reactions, and too low a temperature may affect the reaction rate and product quality.

2. Controlling the degree of vacuum

In the polycondensation reaction, it is necessary to maintain a high degree of vacuum to remove the generated water and promote the progress of the reaction. Too low vacuum may cause the reaction rate to slow down and the molecular weight of the product to decrease.

3. Controlling the ratio of materials to

In the esterification reaction, it is necessary to control the ratio of materials to dibasic acid and dihydric alcohol to ensure the complete progress of the reaction. At the same time, it is also necessary to control the ratio of materials in the polycondensation reaction to obtain the desired molecular weight and product quality.

4. Selection and use of catalysts

selection of suitable catalysts can improve the reaction rate and product quality. It is necessary to pay attention to the amount and addition of the catalyst during use to avoid adverse effects on equipment and products.

5. Conclusion The manufacturing method of

dibasic acid diols includes two steps of esterification reaction and polycondensation reaction. In the production process, it is necessary to strictly control the temperature, vacuum and material ratio and other operating points to ensure product quality and production efficiency. Through reasonable production process and operation points, high-quality dibasic acid diol products can be produced, which provide important production raw materials for plastics, coatings, adhesives, fibers and other fields.

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