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[Chemical Knowledge]：Production and manufacturing method and process of divalent acid ester

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Divalent acid ester is an important raw material for chemical production, which is widely used in plastics, fibers, coatings, medicine and other fields. This article will introduce the manufacturing methods of dibasic acid esters, including esterification, ester exchange, reduction and so on.

1. esterification

esterification is one of the commonly used methods to produce dibasic acid esters, and its main raw materials are dibasic acid and diol. In the esterification reaction, a dibasic acid and a diol are reacted in the presence of a catalyst to form a dibasic acid ester and water. Commonly used catalysts include acidic catalysts such as sulfuric acid and hydrochloric acid and basic catalysts.
the production process of
esterification is relatively simple and easy to operate, but there are some problems such as slow reaction rate, large amount of catalyst and serious equipment corrosion. In addition, the water generated by the reaction needs to be discharged in time to avoid affecting the reaction balance and product quality.

2. Transesterification

Transesterification is a method for producing dibasic acid esters using existing ester compounds. In the transesterification reaction, two molecules of the same ester compound undergo an exchange reaction under the action of an acidic or basic catalyst to produce one molecule of a dibasic ester and one molecule of an alcohol. Compared with the esterification method, the reaction rate of the

method is faster, the amount of catalyst is less, and the equipment is less corrosive. At the same time, the ester exchange method can be used to produce existing ester compounds, which has certain economic advantages.

3. Reduction Method
The
reduction method is a method of producing a dibasic acid ester by reducing a dibasic acid ester. In the reduction reaction, a dibasic acid ester is reduced to a dibasic acid ester by the action of a reducing agent, and an alcohol is produced as a by-product. Commonly used reducing agents include hydrogen, metal hydrides, and the like. The advantage of the

reduction method is that it can avoid the use of acidic or alkaline catalysts, and reduce the problems of equipment corrosion and catalyst residue. However, the production cost of the reduction method is high, and a large amount of reducing agent and high-pressure equipment are required.

4. other methods

In addition to the above three methods, there are some other methods for producing dibasic acid esters, such as phosgenation, dimethyl carbonate, etc. These methods have their own advantages and disadvantages, and can be selected according to the specific production needs and raw materials.

In short, there are many production methods for dibasic esters, which can be selected according to specific production needs and raw materials. In actual production, it is necessary to comprehensively consider the purity, yield, production cost and other factors of the product to select the most suitable production method. At the same time, it is necessary to strengthen safety management and environmental protection measures in the production process to ensure product quality and production safety and environmental protection.

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