酚醛缩聚法处理酚醛树脂废水研究

Study on a phenol-aldehyde condensation process for the pre-treatment of phenolic resin plant effluents

采用酚醛缩聚的方法作为酚醛树脂废水前处理工艺,分别探讨了酸性条件和碱性条件下的酚醛缩合反应。结果表明,碱性条件下,最佳反应条件为甲醛2 mL,Ba(OH)21 g,反应时间3 h,反应温度85℃,COD去除率46.7%,挥发酚去除率42.1%,甲醛去除率72.1%。酸性条件下,最佳反应条件为:甲醛3 mL,HCl 4 mL,反应时间3 h,反应温度100℃,COD去除率47.4%、挥发酚去除率84.6%,甲醛去除率-1.0%。酚醛缩聚法可以有效去除废水中高浓度的挥发酚和甲醛,为后续的化学氧化或生物处理提供良好基础。

Pre-treatment of phenolic resin plant effluents containing highly concentrated phenol has been carried out by phenol-aldehyde condensation method. The optimal conditions are determined under acidic conditions and alkaline conditions respectively. The results showed that the optimal conditions were as follows ： formaldehyde 2 mL, Ba （OH） 2 1 g, reaction time 3 h and reaction temperature 85 ℃, the removal rate of COD,phenol and formaldehyde were 46.7% ,42.1% and 72.1% respectively under alkaline conditions. And the optimal conditions were as follows：formaldehyde 3 mL, HCl 4 mL, reaction time 3 h and reaction temperature 100 ℃, the removal rate of COD, phenol and formaldehyde were 47.4%, 84.6% and -1.0% under acidic conditions. According to the results, phenol-aldehyde condensation process proved to be an effective method for the pre-treatment of phenolic resin plant effluents containing highly concentrated phenol and formaldehyde, it＇ s providing a good foundation for the subsequent chemical oxidation and biological treatment.