Manufacturing method of sebacic acid
I. INTRODUCTION
Sebacic acid is an important organic chemical raw material, which is widely used in the fields of plastics, fibers, pharmaceuticals, pesticides and so on. With the continuous development of science and technology, the manufacturing methods of sebacic acid are also being improved and optimized. In this paper, we will introduce several common manufacturing methods of sebacic acid, and analyze its advantages and disadvantages, in order to provide certain reference to the development of the field of raw materials for chemical production.
II, the physical and chemical properties of sebacic acid
Sebacic acid is a colorless or slightly yellow crystalline powder with a strong irritating odor. It is insoluble in water, but soluble in organic solvents such as ethanol and ether. Sebacic acid has strong acidity and can react with alkali to form salt. In addition, it has good thermal stability and can be used at high temperatures.
III. Manufacturing Methods of Sebacic Acid
1. Castor Oil Cracking Method
The castor oil cracking method is a common manufacturing method for sebacic acid. This method takes castor oil as raw material, and sebacic acid is produced through cracking, oxidation, neutralization and crystallization. Specific steps are as follows: heat castor oil to a certain temperature, pass into the air for oxidative cracking, to generate sebacic acid and other by-products; and then the reaction liquid with alkali neutralization, precipitation of sebacic acid crystals; and finally after centrifugal separation, drying and other processes to get the finished product.
The advantage of this method is that the raw materials are easy to obtain, the process is simple, and the cost is low; the disadvantage is that the production process produces a large amount of wastewater, waste gas, and serious environmental pollution.
2. Phenol method
Phenol method is a more advanced sebacic acid manufacturing method. This method takes phenol as raw material, and sebacic acid is produced through oxidation, esterification, hydrolysis and other processes. The specific steps are as follows: mix phenol with hydrogen peroxide and carry out oxidation reaction to generate benzoquinone; then carry out esterification reaction between benzoquinone and ethanol to generate benzoquinone diethyl ester; finally hydrolyze benzoquinone diethyl ester to get sebacic acid.
The advantages of this method are higher yield, better product quality and less environmental pollution; the disadvantages are higher raw material cost and longer process.
3. Glyoxal method
Glyoxal method is a new type of sebacic acid manufacturing method. This method takes glyoxal as raw material, and sebacic acid is produced through hydroxyl aldehyde condensation, oxidation, acid digestion and other processes. The specific steps are as follows: hydroxyl aldehyde condensation reaction of glyoxal and aldehydes to generate nonanal; then oxidize nonanal to nonanoic acid; finally, acid digestion reaction of nonanoic acid to obtain sebacic acid.
The advantage of this method is that the raw materials are easy to obtain, the reaction conditions are mild, and the yield is high; the disadvantage is that the purity of the product is low, and further separation and purification is required.
Four, comparison and selection of different manufacturing methods
The above introduces three common manufacturing methods of sebacic acid, each method has its advantages and disadvantages and scope of application. When choosing the manufacturing method, it is necessary to make comprehensive consideration according to the actual situation, including the cost of raw materials, product quality, environmental protection requirements and other factors. For example, in areas with high environmental requirements, more environmentally friendly manufacturing methods such as the phenol method can be selected; in the case of readily available raw materials and lower costs, lower-cost manufacturing methods such as castor oil cracking can be selected.
V. Conclusion
Secanedioic acid, as an important organic chemical raw material, its manufacturing method is constantly improved and optimized, which is of great significance for improving product quality, reducing cost and reducing environmental pollution. When choosing the manufacturing method, it is necessary to make comprehensive consideration according to the actual situation and choose the suitable manufacturing method. In the future, with the continuous development of science and technology, it is believed that there will be more new manufacturing methods emerge for the development of the field of raw materials for the production of chemicals to inject new vitality.
