Manufacturing method of tributyl acetyl citrate
I. INTRODUCTION
Acetyltributyl citrate (ATBC) is a widely used plasticizer, which is mainly used in the production of chemicals such as polyvinyl chloride, cellulosic resins and synthetic rubber. Due to its excellent cold resistance, water resistance, low volatility, non-toxic and odorless properties, it is widely used in food packaging, medical devices, children's toys and other fields. In this paper, the manufacturing method of tributyl acetyl citrate will be introduced in detail.
II. Raw materials and equipment
1. Raw materials: citric acid, n-butanol, acetic acid, sulfuric acid catalyst.
2. Equipment: reaction kettle, stirrer, thermometer, condenser, dispensing funnel, vacuum pump, etc.
3. Manufacturing steps
1. Esterification reaction: add citric acid and n-butanol into the reaction kettle according to the molar ratio of 1:3, add an appropriate amount of sulfuric acid as a catalyst, stirring and heating to the reflux temperature, esterification reaction. The water generated during the reaction should be removed in time to keep the reaction proceeding smoothly.
2. Neutralization reaction: When the esterification reaction is finished, cool to room temperature, add an appropriate amount of sodium carbonate solution to neutralize the remaining sulfuric acid catalyst, and adjust the pH to neutral.
3. Extraction and washing: the neutralized reaction solution is extracted with ethyl acetate, and the extract is washed with saturated brine to remove the water and impurities.
4. Desolvation and refining: The washed ethyl acetate extract is subjected to vacuum distillation to remove the solvents such as ethyl acetate and n-butanol from it, and crude tributyl acetyl citrate is obtained.
5. Packing of finished products: Refine the crude tributyl acetyl citrate, adjust it to the specified index, and then put it into special plastic drum or iron drum and keep it sealed.
4. Precautions
1. In the operation process, the temperature, time, pH and other parameters of each step should be strictly controlled to ensure the quality and yield of the product.
2. The water generated during the esterification reaction should be removed in time to avoid affecting the reaction.
3. In the extraction and washing process, attention should be paid to controlling the amount of detergent and the number of washing to ensure the purity of the product.
4. Care should be taken to control the vacuum degree and distillation temperature in the process of desolvation and refining in order to avoid the decomposition and loss of the product.
V. Conclusion
The manufacturing method of tributyl acetyl citrate mainly includes the steps of esterification reaction, neutralization reaction, extraction and washing, desolvation and refining. The parameters of each step should be strictly controlled during the operation to ensure the quality and yield of the product. Meanwhile, the production equipment and operation environment need to be strictly monitored and maintained in order to ensure the safety and reliability of the product.
In conclusion, as an important plasticizer, tributyl acetyl citrate has a wide range of application prospects in the field of raw materials for chemical production. By mastering its manufacturing method, we can better understand the properties and applications of tributyl acetyl citrate and provide strong support for chemical production.
