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.
I. Raw material preparation
The main raw materials for manufacturing butyl propionate are propionic acid and n-butanol. These two raw materials are relatively easy to obtain in the market, with stable and reliable quality. 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, it is also necessary to prepare the catalyst, polymerization inhibitor and other auxiliary materials.
II. Reaction process
1. Esterification reaction
Propionic acid and n-butanol are added into the esterification reactor according to a certain molar ratio, and the mixture is heated after adding catalyst. Under a certain temperature and pressure, propionic acid and n-butanol undergo esterification reaction to produce butyl propionate and water. The reaction is reversible and requires the use of excess n-butanol to improve the yield of butyl propionate.
2. Dehydration reaction
After the esterification reaction is completed, a certain amount of concentrated sulfuric acid is added to the reactor as a dehydrating agent so that the water produced by the reaction is removed. At the same time, concentrated sulfuric acid can also catalyze the esterification reaction and further increase the yield of butyl propionate.
3. Distillation and separation
After the dehydration reaction, the butyl propionate is separated from the unreacted n-butanol, water and other impurities by distillation. Temperature and pressure should be controlled during the distillation process to ensure the stability of product quality.
III. Post-treatment
1. Washing
The butyl propionate obtained by distillation contains a small amount of acidic impurities, which needs to be washed with alkaline absorbent to remove the acidic substances. After washing, the butyl propionate is washed with water to neutral, and then dehydrated.
2. Refining
The dehydrated butyl propionate is refined by means of distillation to obtain a product of higher purity. During the distillation process, the temperature at the top and bottom of the tower should be controlled to ensure the stability of product quality.
4. Precautions
1. During the manufacturing process, each process parameter should be strictly controlled to ensure product quality and yield.
2. Operators need to be professionally trained and familiar with the process and safety operation regulations.
3. The production site should be kept neat and orderly to ensure the normal operation of equipment and personnel safety.
4. Pollutants such as wastewater and exhaust gas produced should be properly treated to meet the requirements of environmental protection.
In short, the manufacturing method of butyl propionate includes raw material preparation, reaction process and post-treatment. During the production process, each process parameter should be strictly controlled to ensure product quality and yield. At the same time, safety management and environmental protection control should be strengthened to ensure the smooth progress of the production process.
