絮凝法回收聚乙烯醇工艺条件的研究

Study on recovery of polyvinyl alcohol with flocculation method

利用硫酸与氢氧化钠反应生成的硫酸钠作为盐析剂,碳酸钠作助凝剂,采用絮凝法回收聚乙烯醇。通过正交实验研究了聚乙烯醇回收最佳条件,并得到碳酸钠、硫酸和硼酸用量的最佳配比,同时对回收物进行了红外光谱分析。实验结果表明,该工艺条件下处理含聚乙烯醇废水的回收率可达96.5%,硫酸钠的用量可减少60%。

The recovery of polyvinyl alcohol （PVA） from dying wastewater by flocculation method is investigated. The obtained sodium sulfate through acid alkali relation is used as sah-out agent. The sodium carbonate is used as coagulant agent. The optimal ratio of salt-out agent and coagulating agent is obtained by orthogonal experiment. The structure of recovered PVA is analyzed by infrared spectrum. The resuhs show that the PVA recovery rate is as high as 96. 5% and the amount of sodium sulfate is reduced by 60%.