In the actual operation process, the impurities such as maleic anhydride, citric anhydride, benzene, o-xylene, benzoic acid and o-toluic acid can be effectively removed in the process of condensation distillation of o-phthalic anhydride. In the early stage of catalyst use, anthraquinone and its homologues have less heavy impurities. After distillation, it can be reduced to an acceptable level (but in the later stage, it is difficult to increase the generation of Tetrachlorobenzene phthalein alone due to poor performance of catalyst and catalyst. Anthraquinone and its homologues and other heavy-duty theories cannot be completely removed by distillation, which will affect the quantity and thermal stability of the melting color of phthalic anhydride products. Phthalide itself is colorless "even if the amount of addition is as high as 0.5%), but the number of colors that affect the thermal stability is much larger (this shows that it is unstable in nature, easy to convert into chromogenic substances, and the number of colors of phthalic anhydride, especially the number of colors that are thermally stable, increases significantly.

　　因为酞和邻苯二甲酸酐是很难有效和完全独立的,所以在实际业务流程尽可能地控制酞,确保邻苯二甲酸酐的质量是非常重要的,当然,高性能催化剂的使用可以减少酞“高负载的催化剂的使用可以提高设备的操作能力。但是，随着装置的运行，高性能催化剂的活性会慢慢降低，同时邻苯二甲酸的产生量也会相应增加(反应温度升高后，生成的邻苯二甲酸会进一步被氧化)。在催化剂活性大幅度降低之前，通过降低装置的负荷和运行能力，也可以保证邻苯二甲酸酐的质量。在催化剂使用的后期，当邻苯二甲酸和重杂质蒽醌及其同系物的产量增加到一定程度时，需要更换催化剂以保证邻苯二甲酸酐的质量。

　　Because phthalic acid and phthalic anhydride are difficult to be effective and completely independent, it is very important to control the production of phthalic acid as much as possible in the actual business process to ensure the quality of phthalic anhydride. Of course, the use of high-performance catalyst can reduce the use of catalyst with high load for the production of phthalic acid, which can improve the operation capacity of the equipment. However, with the operation of the unit, the activity of the high-performance catalyst will slowly reduce, and the amount of phthalic acid produced will also increase correspondingly (after the reaction temperature increases, the phthalic acid produced will be further oxidized). Two kinds of two kinds of catalysts will be used in the production of phthalic acid. The quality of phthalic anhydride can also be guaranteed by reducing the load and operation capacity of the unit before the catalyst activity is greatly reduced. When the output of phthalic acid, anthraquinone and their homologues increases to a certain extent, the catalyst needs to be replaced to ensure the quality of phthalic anhydride.

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　　The above is the relevant content introduced by maleic anhydride manufacturer. If you want to know more, please visit the website: http://www.jnjhhg.cn