BHT (Butylated Hydroxytoluene) is a commonly used antioxidant, which is widely used in the fields of food, chemical and pharmaceutical. In the field of raw materials for chemical production, there are several manufacturing methods of BHT:
1. Acylation method
Acylation method is a commonly used manufacturing method of BHT, which mainly takes phenol and ethyl formate as raw materials, and produces BHT through acylation reaction.The specific manufacturing process is as follows:
(1) Phenol and catalyst are added to the reaction kettle, and then heated to a certain temperature, and then ethyl formate is added to carry out the acylation reaction. reaction.
(2) After the end of the reaction, cool to room temperature, precipitate the solid product, after filtration, washing, drying and other steps, to get the finished product of BHT.
Acylation method has the advantages of easy to obtain raw materials, simple operation and high yield, so it is widely used in industrial production.
2. Alkylation method
Alkylation method is also a commonly used method for manufacturing BHT, which mainly takes phenol and isopropanol as raw materials, and produces BHT through alkylation reaction.The specific manufacturing process is as follows:
(1) Phenol and catalyst are added into the reaction kettle, and after heated up to a certain temperature, isopropanol is added to carry out the alkylation reaction.
(2) After the end of the reaction, cool to room temperature, precipitate the solid product, after filtration, washing, drying and other steps, to get the finished product of BHT.
The advantage of alkylation method is that it can avoid the use of toxic and harmful raw materials such as ethyl formate, and it can also improve the purity and yield of BHT.
3. Oxidation method
The oxidation method is a relatively new method of manufacturing BHT, which mainly uses phenol and hydrogen as raw materials, and produces BHT through oxidation reaction.The specific manufacturing process is as follows:
(1) Add phenol and catalyst into the reaction kettle, pass the hydrogen, and heat it up to a certain temperature, then add oxidizing agent for oxidation reaction.
(2) After the end of the reaction, cool to room temperature and distill the reaction solution to obtain the finished product of BHT.
The advantage of the oxidation method is that it can avoid the use of toxic and harmful raw materials, and it can also improve the purity and yield of BHT. However, the operating conditions of the oxidation method are more harsh, requiring higher temperature and pressure, so it is less used in actual production.
No matter which manufacturing method is used, the reaction conditions and raw material quality need to be strictly controlled to ensure the quality and yield of the product. Meanwhile, safety management and environmental protection measures also need to be strengthened during the production process to ensure the safety and sustainability of the production process.
In conclusion, there are various methods for manufacturing BHT, and different methods have their own advantages and disadvantages, which need to be selected according to the actual situation. In the future development, with the continuous improvement of environmental awareness and technology, I believe there will be more environmentally friendly, efficient and economical manufacturing methods emerge.
