Manufacturing method of dibasic acid ester (DBE)
I. INTRODUCTION
Dibasic acid ester (DBE) is an important raw material for the production of chemicals, which is widely used in the fields of coatings, inks, adhesives, plastics and so on. With the growing market demand, the manufacturing method of DBE has become a hot research topic. This paper will introduce a common manufacturing method of DBE.
II. Raw materials and equipment
1. Raw materials: ethanol, acetic acid, catalyst (sulfuric acid)
2. Equipment: reaction kettle, condenser, water divider, stirrer, thermometer, pressure gauge, etc.
III. Manufacturing steps
1. Feeding: put ethanol and acetic acid into the reaction kettle according to a certain proportion, and add appropriate amount of catalyst sulfuric acid at the same time.
2. Heating reaction: turn on the stirrer and heat the reaction kettle, so that the raw materials are esterified under the action of catalyst. Control the reaction temperature and keep it for a certain time.
3. Water Separation: Separate the water generated from the reaction through the water separator to promote the esterification reaction in the positive direction.
4. Post-treatment: After the reaction is finished, stop heating, cool the reactor and post-treat the reaction liquid to get DBE products.
4. Precautions
1. Control the reaction temperature: esterification reaction is exothermic reaction, it is necessary to control the reaction temperature to avoid the side reaction caused by too high temperature.
2. Water separation operation: the water separator needs to discharge the generated water in time to promote the esterification reaction.
3. Catalyst dosage: the dosage of catalyst needs to be appropriate, too much will lead to post-treatment difficulties, too little will affect the reaction rate.
4. Safety measures: the production process needs to strictly comply with the safety operating procedures to avoid accidents.
V. Summary
The above is a common manufacturing method of dibasic acid ester (DBE), and by controlling the reaction conditions and post-processing steps, high quality DBE products can be obtained. It is necessary to pay attention to safety during the production process and strictly follow the operating procedures to ensure smooth production.
