[Chemical Knowledge]：Production method and process of sebacic acid

The manufacturing method
of sebacic acid
1. Introduction

Sebacic acid is an important organic chemical raw material, widely used in plastics, fibers, pharmaceuticals, pesticides and other fields. With the continuous development of science and technology, the manufacturing method of sebacic acid is constantly improved and optimized. This paper will introduce several common sebacic acid manufacturing methods, and analyze their advantages and disadvantages, in order to provide some reference for the development of chemical production raw materials.

2. the physical and chemical properties of sebacic acid

sebacic acid is a colorless or slightly yellow crystalline powder with a strong pungent odor. It is insoluble in water, but soluble in ethanol, ether and other organic solvents. Sebacic acid is highly acidic and can react with bases to form salts. In addition, it also has good thermal stability and can be used at high temperatures.

3. sebacic acid manufacturing method

1. castor oil cracking

castor oil cracking method is a common sebacic acid manufacturing method. The method uses castor oil as raw material to produce sebacic acid through cracking, oxidation, neutralization, crystallization and other processes. The specific steps are as follows: the castor oil is heated to a certain temperature, and air is introduced for oxidative cracking to generate sebacic acid and other by-products; then the reaction solution is neutralized with alkali to precipitate sebacic acid crystals; finally, the finished product is obtained through centrifugal separation, drying and other processes.

The advantages of this method are that the raw materials are easily available, the process is simple, and the cost is low; the disadvantage is that a large amount of waste water and waste gas are produced during the production process, and the environmental pollution is serious.

2. phenol method

phenol method is a more advanced sebacic acid manufacturing method. The method uses phenol as raw material to produce sebacic acid through oxidation, esterification, hydrolysis and other processes. The specific steps are as follows: phenol is mixed with hydrogen peroxide to undergo an oxidation reaction to produce benzoquinone; benzoquinone is then esterified with ethanol to produce benzoquinone diethyl ester; and finally benzoquinone diethyl ester is hydrolyzed to obtain sebacic acid.

The advantages of this method are higher yield, better product quality and less environmental pollution, and the disadvantage is that the cost of raw materials is higher and the process is longer.

3. Glyoxal method

Glyoxal method is a new method for the manufacture of sebacic acid. The method uses glyoxal as raw material to produce sebacic acid through aldol condensation, oxidation, acid hydrolysis and other processes. The specific steps are as follows: glyoxal and aldehyde compounds are subjected to aldol condensation reaction to generate nonanal; then nonanal is oxidized to nonanoic acid; finally, nonanoic acid is subjected to acidolysis reaction to obtain sebacic acid.

The advantages of this method are that the raw materials are readily available, the reaction conditions are mild, and the yield is high; the disadvantage is that the product purity is low, and further separation and purification are required. Comparison and selection
of different manufacturing methods for

4.
Three common sebacic acid manufacturing methods are introduced above, each of which has its advantages, disadvantages and scope of application. When choosing a manufacturing method, it is necessary to consider comprehensively according to the actual situation, including factors such as raw material cost, product quality, and environmental protection requirements. For example, in areas with high environmental protection requirements, a more environmentally friendly manufacturing method such as the phenol method can be selected; in the case of readily available raw materials and low cost, a lower-cost manufacturing method such as the castor oil cracking method can be selected.

5. conclusion

sebacic acid as an important organic chemical raw material, the continuous improvement and optimization of its manufacturing method is of great significance for improving product quality, reducing costs and reducing environmental pollution. When choosing a manufacturing method, you need to consider comprehensively according to the actual situation and choose a manufacturing method that suits you. In the future, with the continuous development of science and technology, it is believed that more new manufacturing methods will emerge, which will inject new vitality into the development of chemical production raw materials.