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Differences in production methods of phthalic anhydride

                     Differences in production methods of phthalic anhydride


Phthalic anhydride is an important organic chemical substance widely used in pesticides, dyes, medicine and other fields. In the production process of phthalic anhydride, two methods, the ortho method and the Ne method, are often used. So, what is the difference between these two methods?


First let’s look at the neighbor method. The o-method is a method in which benzoic acid is obtained by reacting phenoxylate and carbon dioxide, and then phthalic anhydride is obtained through oxidation. The advantages of this method are mild reaction conditions and simple operation, but there may be a small amount of o-phenol impurities in the product, which requires further purification. The nefir method is a method that obtains sodium benzoate through the reaction of benzoyl chloride and sodium hydroxide, and then obtains phthalic anhydride through heating. The advantage of the Naf method is that the product has high purity, but the reaction conditions are harsh and it has a large impact on the environment.


From the perspective of the reaction principle, the ortho method obtains benzoic acid through an alkaline substitution reaction of phenoxylate, and then obtains phthalic anhydride through oxidation; while the Nye method obtains benzoic acid through an alkaline hydrogenation reaction of benzoyl chloride and then through Heating gives phthalic anhydride. The reaction conditions and product purity of the two methods are different, and the raw materials used are also different.


In general, both the o-method and the Nemethane method are methods for producing phthalic anhydride, and each has its own advantages and limitations in practical applications. Understanding their differences will help us choose more appropriate methods in actual production, improve production efficiency, reduce production costs, and promote the sustainable development of the chemical industry.


Any new demand of Phthalic anhydride,pls don’t hesitate to contact Henan Sinowin Chemical for more details ! 

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