Manufacturing method of n-butyl acrylate
I. Introduction
n-butyl acrylate is an important organic chemical raw material, which is widely used in polymer synthesis, coatings, adhesives, fibers and other fields. With the continuous development of science and technology, the manufacturing method of n-butyl acrylate has been improved and optimized. This paper will introduce a common manufacturing method of n-butyl acrylate.
II. Raw materials and equipment
1. Raw materials: acrylic acid, n-butanol, catalyst (sulfuric acid or p-toluenesulfonic acid), polymerization inhibitor (e.g., hydroquinone) and so on.
2. Equipment: reactor, stirrer, condenser, thermometer, pressure gauge, etc.
3. Manufacturing steps
1. Batching: add raw materials such as acrylic acid, n-butanol, catalyst, polymerization inhibitor and so on into the reactor according to a certain proportion.
2. Heating reaction: turn on the stirrer, heat the reaction kettle, so that the temperature of the reaction liquid rises to the predetermined reaction temperature, and keep the constant temperature reaction for a certain period of time.
3. Dehydration: After the reaction, cool the reaction liquid to a certain temperature, add a certain amount of alkaline absorbent to neutralize the remaining acid in the reaction liquid, and then carry out distillation and dehydration.
4. Refining: After dehydration, n-butyl acrylate is subjected to refining to remove the impurities in it and get the product with higher purity.
4. Precautions
1. Strictly control the reaction temperature and time to prevent side reactions and product quality decline.
2. Pay attention to the ratio of raw materials and the order of addition to ensure the smooth progress of the reaction.
3. Keep stirring evenly during the reaction to prevent local overheating and product lumping.
4. Control the dosage of alkaline absorbent and neutralization time during dehydration to avoid over-neutralization or under-neutralization.
5. Ensure the sealing of the equipment and the safety of operation during the refining process to prevent the product from being contaminated or causing safety accidents.
5. Conclusion
The manufacturing method of n-butyl acrylate involves a number of links and precautions, and requires strict control of raw materials, equipment, operation and other aspects of the conditions, in order to ensure the quality of the product and the safety of production. Meanwhile, with the continuous development of science and technology, the manufacturing method of n-butyl acrylate is also being improved and optimized, and the work of improving production efficiency, reducing energy consumption and reducing environmental pollution still needs to be further promoted.
