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[Chemical Knowledge]：Production and manufacturing method and process of dibutyl ester

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The manufacturing method
of dibutyl ester
1. Introduction

dibutyl ester is a widely used chemical production raw material, mainly used in plastics, rubber, paint, ink and other industries. With the continuous development of science and technology, the manufacturing method of dibutyl ester is also improving, this paper will discuss the manufacturing method of dibutyl ester.

2. raw materials and formula

The main raw materials for the manufacture of dibutyl ester are butyric acid and ethanol. Wherein, butyric acid can use n-butyric acid or isobutyric acid, ethanol can use industrial grade ethanol. In addition, the catalyst sulfuric acid and the polymerization inhibitor hydroquinone are required.

formula ratio: butyric acid: ethanol: sulfuric acid: hydroquinone = 1:1.2:0.01:0.005 (mass ratio).

3. Manufacturing Process

1. Esterification Reaction

Butyric acid and ethanol are added to the esterification reactor according to the formula ratio, sulfuric acid is added as a catalyst, and the esterification reaction is carried out by heating to reflux temperature. During the reaction, the water generated by the reaction should be removed in time to promote the reaction to the direction of dibutyl ester. The reaction time is about 4-6 hours.

2. Neutralization and washing

After completion of the reaction, the reaction solution was cooled to room temperature, and a sodium carbonate solution was added to neutralize the remaining sulfuric acid, followed by washing with water to neutrality.

3. Distillation

The washed dibutyl ester solution is distilled, ethanol is first recovered by atmospheric distillation, and then pure dibutyl ester is obtained by vacuum distillation.

4. Precautions

1. The amount of catalyst sulfuric acid should be appropriate, too much will lead to equipment corrosion, too little will affect the esterification reaction.
2. The amount of polymerization inhibitor hydroquinone should also be appropriate, too much will affect the quality of the product, too little can not effectively inhibit the polymerization reaction.
3. During the esterification reaction, the water generated by the reaction should be removed in time to promote the reaction to the direction of dibutyl ester.
4. In the process of distillation, the temperature and vacuum should be controlled to ensure the quality and yield of the product.

5. product quality and yield

Using the above manufacturing method, high purity dibutyl ester products can be obtained, and the quality meets national standards. The yield is generally above 90%.

6. three waste treatment and environmental protection

In the manufacturing process of dibutyl ester, some waste water, waste gas and waste residue will be produced. In order to protect the environment, it is necessary to deal with these three wastes effectively. Waste water can be treated by biochemical treatment or chemical treatment, waste gas can be treated by absorption, combustion and other methods, and waste residue can be comprehensively utilized or safely landfilled. At the same time, in the production process, we must follow environmental regulations, strengthen environmental management, and ensure the environmental protection and sustainability of the production process.

7. conclusion

as an important chemical raw material, widely used in plastics, rubber, paint, ink and other industries. This paper introduces a feasible production method of dibutyl ester, which uses butyric acid and ethanol as raw materials, sulfuric acid as catalyst, hydroquinone as inhibitor, through esterification reaction, neutralization washing, distillation and other processes, can obtain high purity dibutyl ester products. In the production process, it is necessary to pay attention to the amount of catalyst and polymerization inhibitor, remove the water generated by the reaction in time, and control the distillation temperature and vacuum degree to ensure the quality and yield of the product. At the same time, it is necessary to strengthen environmental protection management, effectively deal with the three wastes generated, and ensure the environmental protection and sustainability of the production process.

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