Phthalic anhydride is an important chemical raw material. At present, naphthalene oxidation and o-xylene oxidation are the main methods to produce phthalic anhydride at home and abroad. Both methods produce dark brown rectification residues in the purification process of phthalic anhydride. The waste contains a large amount of phthalic anhydride, as well as some black tar and polymers, which cannot be directly produced and utilized.

目前有各种回收方法，其中比较多的有溶剂萃取法、升华法和反应深加工处理法等。但各种工艺均不能很好的满足实际要求。本研究按某厂提出的产品不含焦油、收率高、成本低的要求，采用简单合理的回收工艺可回收几乎废料中的全部苯酐，产品质量好。采用该法处理回收某厂苯酐废料６００吨，可年产粗苯酐近５００吨，再结合工厂的需要将该苯酐返回到苯酐装置出工业优级品，不影响苯酐装置的正常。该技术可降低苯酐成本，为工厂带来一定的经济效益。目前国内苯酐能力估计为７０万吨，按２％计算可年产废料１．４万吨，估计可回收１万多吨苯酐。若该技术推广全国或向国外转化技术将具有很好的经济和社会效益。该技术成熟，达到水平。

At present, there are various recovery methods, among which solvent extraction, sublimation and reaction deep processing are more common. However, various production processes can not meet the actual requirements very well. In this study, according to the requirements of a factory that the product contains no tar, has high yield and low cost, a simple and reasonable recovery process can be used to recover almost all phthalic anhydride in the waste, and the product quality is good. This method is used to treat and recover 600 tons of phthalic anhydride waste from a certain factory, which can produce nearly 500 tons of crude phthalic anhydride annually. Combined with the needs of the factory, the phthalic anhydride is returned to the phthalic anhydride production unit to produce industrial high-grade products, which will not affect the normal production of the phthalic anhydride unit. This technology can reduce the production cost of phthalic anhydride and bring certain economic benefits to the factory. At present, the domestic production capacity of phthalic anhydride is estimated to be 700000 tons. According to 2% calculation, 14000 tons of waste can be produced annually, and it is estimated that more than 10000 tons of phthalic anhydride can be recovered. It will have good economic and social benefits if the technology is popularized nationwide or transferred to foreign countries. The technology is mature and reaches the international advanced level.

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