At present, there are various recovery methods of phthalic anhydride, among which the solvent extraction method, sublimation method and reaction deep processing method are more common. But all kinds of business processes can not meet the actual requirements well. In this study, according to the requirements of a factory that the product does not contain tar, high yield and low cost, a simple and reasonable recovery process can be used to recover almost all of the phthalic anhydride in the waste, and the product quality is good. Using this method to treat and recycle 600 tons of phthalic anhydride waste from a certain plant, with an annual output of nearly 500 tons of crude phthalic anhydride. Combined with the needs of the factory, this phthalic anhydride can be returned to the phthalic anhydride business unit to produce industrial-grade products without affecting the normal operation of the phthalic anhydride unit. This technology can reduce the operating cost of phthalic anhydride and bring certain economic benefits to the plant. At present, the domestic operating capacity of phthalic anhydride is estimated to be 700,000 tons, and the annual output of waste can be 14,000 tons based on 2%. It is estimated that more than 10,000 tons of phthalic anhydride can be recovered. If the technology is popularized nationwide or transferred abroad, it will have very good economic and social benefits. The technology is mature and has reached the international advanced level.
Phthalic anhydride is an important chemical raw material. Zibo Shenzhan Industry and Trade Co., Ltd. is a private joint-stock company mainly engaged in chemical products. . At present, the main methods of operating phthalic anhydride at home and abroad are naphthalene oxidation and o-xylene oxidation. Both methods have dark brown distillation residues in the purification process of phthalic anhydride. This waste contains a large amount of phthalic anhydride, and it also contains some black tar and polymers, which cannot be directly used for business.
Shandong Shunxinlong New Material Technology Co., Ltd. Website: http://hfzyzn.com Welcome you!
Please Baidu: Shun Xinlong maleic anhydride , Shun Xinlong phthalic anhydride , Shun Xinlong dicyclopentadiene , Shun Xinlong refined terephthalic acid