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[Chemical Knowledge]：Production and manufacturing method and process of butyl propionate

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Manufacturing Method
of Butyl Propionate
Butyl propionate is an important organic chemical raw material, which is widely used in coatings, inks, adhesives, plastic plasticizers and other fields. This article will introduce the manufacturing method of butyl propionate, including raw material preparation, reaction process, post-treatment and so on.

1. Raw Material Preparation

The main raw materials for the manufacture of butyl propionate are propionic acid and n-butanol. These two raw materials are relatively easy to obtain in the market, and the quality is stable and reliable. Before feeding, the raw materials need to be checked to ensure that their purity and moisture and other indicators meet the process requirements. At the same time, also need to prepare the catalyst, inhibitor and other auxiliary materials.

2. Reaction Process

1. Esterification Reaction
Propionic acid and n-butanol are added into an esterification reactor according to a certain molar ratio, and the mixture is heated after adding a catalyst. Under certain temperature and pressure, propionic acid and n-butanol are esterified to produce butyl propionate and water. This reaction is reversible and requires the use of an excess of n-butanol to increase the yield of butyl propionate.
2. Dehydration reaction
After the esterification reaction, a certain amount of concentrated sulfuric acid is added to the reactor as a dehydrating agent to remove the water generated by the reaction. At the same time, concentrated sulfuric acid can also catalyze the esterification reaction to further improve the yield of butyl propionate.
3. Distillation and Separation
After the dehydration reaction is completed, butyl propionate is separated from unreacted n-butanol, water and other impurities by distillation. The temperature and pressure should be controlled during the distillation process to ensure the stability of the product quality.

3. Post-treatment

1. Washing
The butyl propionate obtained by distillation contains a small amount of acidic impurities and needs to be washed with an alkaline absorbent to remove acidic substances. The washed butyl propionate was washed with water until it became neutral, and then subjected to dehydration treatment.
2. Refining
The dehydrated butyl propionate is refined by distillation to obtain a higher purity product. The temperature at the top and bottom of the tower should be controlled during the distillation process to ensure the stability of product quality.
Precautions for
4.

1. In the manufacturing process, each process parameter should be strictly controlled to ensure product quality and yield.
2. Operators shall be professionally trained and familiar with the process flow and safety operation procedures.
3. The production site shall be kept clean and orderly to ensure the normal operation of equipment and the safety of personnel.
4. Pollutants such as waste water and waste gas should be properly treated to meet environmental protection requirements.

In short, the manufacturing method of butyl propionate includes raw material preparation, reaction process, post-treatment and other links. In the production process, the process parameters should be strictly controlled to ensure product quality and yield. At the same time, strengthen safety management and environmental governance to ensure the smooth progress of the production process.

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