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[Chemical Knowledge]：Lead the production process and preparation method of dioctyl phthalate DOP.

Read： 330 Time：18months ago Source：Transform the World with Simplicity

Dioctyl phthalate DOP is a commonly used plasticizer, which is widely used in the production of PVC, polyethylene, polypropylene and other plastics. This article will introduce the production process and preparation method of DOP.

1. production process

DOP production process is generally divided into two steps: esterification reaction and dehydration reaction.

1. Esterification

Octanol and benzoic acid are esterified in the presence of a catalyst to produce octyl benzoate. In this process, it is necessary to control the reaction temperature, reaction time and pressure.

2. Dehydration Reaction

Octyl benzoate is dehydrated with excess sulfuric acid to generate dioctyl benzoate DOP. In this process, it is necessary to control the reaction temperature, reaction time and the amount of sulfuric acid.

2. preparation method

DOP preparation method mainly has two kinds: the traditional esterification reaction method and the new microwave synthesis method.

1. The traditional esterification reaction method

the reaction of octanol and benzoic acid in the presence of a catalyst to produce octyl benzoate. The dehydration reaction is then carried out with an excess of sulfuric acid to produce DOP.

the traditional esterification reaction method has the advantages of mild reaction conditions and stable reaction. However, the reaction time is long, the energy consumption is high, and the production efficiency is low.

2. New microwave synthesis

Using microwave heating technology, octanol and benzoic acid react rapidly in the presence of a catalyst to produce octyl benzoate, and then use excess sulfuric acid for dehydration reaction to produce DOP.

new microwave synthesis method has the advantages of fast reaction speed, high reaction efficiency and low energy consumption. However, the technology is still in the research stage and needs to be further improved. Summary of

3.

DOP is an important plasticizer, and its production process and preparation method have an important impact on the quality and efficiency of plastic production. Through the introduction of this paper, we understand that the production process of DOP is generally divided into two steps: esterification reaction and dehydration reaction, and the preparation methods mainly include the traditional esterification reaction method and the new microwave synthesis method. In actual production, suitable production processes and preparation methods can be selected according to product requirements and production conditions to improve production efficiency and product quality.