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[Chemical Knowledge]：Production and manufacturing method and process of acetyl tributyl citrate

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The manufacturing method
of acetyl tributyl citrate
1. Introduction

Acetyl tributyl citrate (ATBC) is a widely used plasticizer, mainly used in the production of polyvinyl chloride, cellulose resin and synthetic rubber and other chemicals. Because of its excellent cold resistance, water resistance, low volatility, non-toxic, tasteless and other characteristics, it has been widely used in food packaging, medical equipment, children's toys and other fields. This article will detail the manufacturing method of acetyl tributyl citrate.

2. raw materials and equipment

1. raw materials: citric acid, butanol, acetic acid, sulfuric acid catalyst.
2. Equipment: reaction kettle, stirrer, thermometer, condenser, separatory funnel, vacuum pump, etc.

3. Manufacturing Steps

1. Esterification reaction: citric acid and n-butanol are added into a reaction kettle at a molar ratio of 1:3, an appropriate amount of sulfuric acid is added as a catalyst, and the mixture is stirred and heated to reflux temperature to carry out esterification reaction. During the reaction, the generated water should be removed in time to maintain the smooth progress of the reaction.
2. Neutralization reaction: After the esterification reaction is completed, cool to room temperature, add an appropriate amount of sodium carbonate solution to neutralize the remaining sulfuric acid catalyst, and adjust the pH value to neutral.
3. Extraction and washing: The neutralized reaction solution was extracted with ethyl acetate, and the extract was washed with saturated brine to remove water and impurities.
4. Desolvation and purification: The washed ethyl acetate extract was subjected to vacuum distillation to remove solvents such as ethyl acetate and n-butanol to obtain crude tributyl acetylcitrate.
5. Finished product packaging: the crude acetyl tributyl citrate is refined, adjusted to the specified index, put into a special plastic drum or iron drum, sealed preservation.
Precautions for
4.

1. During the operation, the temperature, time, pH and other parameters of each step must be strictly controlled to ensure the quality and yield of the product.
2. During the esterification reaction, the generated water should be removed in time to avoid affecting the reaction.
3. in the extraction and washing process should pay attention to control the amount of detergent and washing times, in order to ensure the purity of the product.
4. Attention should be paid to control the vacuum degree and distillation temperature in the process of desolublization and refining to avoid decomposition and loss of products.

5. conclusion The manufacturing method of

acetyl tributyl citrate mainly includes esterification reaction, neutralization reaction, extraction and washing, desolubilization and purification. During the operation, the parameters of each step should be strictly controlled to ensure the quality and yield of the product. At the same time, in order to ensure the safety and reliability of the product, it is also necessary to strictly monitor and maintain the production equipment and operating environment.

In conclusion, as an important plasticizer, acetyl tributyl citrate has broad application prospects in the field of chemical production raw materials. By mastering its manufacturing method, we can better understand the nature and application of acetyl tributyl citrate, and provide strong support for chemical production.

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