Butylene Glycol (BG) is an important organic chemical raw material, which is widely used in cosmetics, pharmaceuticals, food, plastics and textiles. In the field of raw materials for chemical production, there are several main manufacturing methods of Butylene Glycol:
1. Acetic Acid Method
The Acetic Acid Method is to generate Butylene Glycol by hydrogenation reaction with acetic acid as the raw material. The specific steps are as follows: acetic acid is mixed with hydrogen, and the hydrogenation reaction is carried out under heating and pressure to produce a mixture of butanediol and water. Then, the pure butanediol product is obtained by distillation and separation. This method has the advantages of easy availability of raw materials and mild reaction conditions, but the production cost is high.
2. Ethylene Method
The ethylene method is to produce butanediol by oxidizing, hydrolyzing and hydrogenating ethylene as raw material. The specific steps are as follows: first, ethylene and oxygen under the action of catalyst undergo oxidation reaction to produce ethylene oxide. Then, ethylene oxide is hydrolyzed with water under acidic conditions to produce ethylene glycol. Finally, ethylene glycol is hydrogenated under the action of catalyst to produce butanediol. This method has the advantages of abundant raw materials, higher yield and lower cost, and is one of the commonly used methods in industrial production.
3. 1,4-Butanediol Method
1,4-Butanediol method is to generate butanediol by dehydrogenation reaction using 1,4-butanediol as raw material. The specific steps are as follows: 1,4-butanediol is heated to a certain temperature and oxygen is introduced to carry out the dehydrogenation reaction to produce butanediol and water. This method has the advantages of single raw material and simple reaction conditions, but the yield is low and the production cost is high.
4. Biological method
Biological method is the method of producing butanediol by microbial fermentation. The specific steps are as follows: mix carbon source material such as glucose with appropriate amount of nutrients such as nitrogen source and phosphorus source, inoculate butanediol producing bacteria, and carry out fermentation under suitable conditions such as temperature and pH value to produce butanediol. This method has the advantages of environmental protection and sustainability, but it is still in the research stage and has not yet realized industrialized production.
In conclusion, there are various methods for manufacturing butanediol, and different methods have different advantages, disadvantages and scope of application. In actual production, suitable manufacturing methods should be selected according to specific production conditions and demands to improve production efficiency and economic benefits.
