处理含苯酚污水的吸附剂筛选和吸附机理研究

针对中国石化金陵分公司含硫污水汽提氨精制装置因苯酚存在导致回收氨水质量较差的问题，开展了固定床吸附法回收苯酚的吸附剂筛选和机理研究。考察了3A分子筛、13X分子筛、γ-Al2O3和3种活性炭对苯酚的吸附性能。结果表明：对苯酚，γ-Al2O3和分子筛因具有极性而表现出较差的吸附性能，其中3A分子筛因孔径小于苯酚的分子动力学直径，吸附性能最差；活性炭因表面呈弱极性和较大的比表面积而具有最优的吸附性能。进一步研究发现，更多介孔结构和介孔-大孔多级孔道分布结构有利于提高苯酚的吸附能力。建立了Yoon-Nelson动力学模型，可较好地模拟苯酚在活性炭床层的吸附穿透过程，为将来绘制苯酚吸附穿透曲线提供了具体方案。

STUDY OF SELECTION AND MECHANISM OF ADSORBENTS FOR TREATMENT OF PHENOL-CONTAINING WASTEWATER

Aiming at the problem of the low quality of recovered ammonia water due to the presence of phenol in the sulfur-containing wastewater stripping ammonia unit of SINOPEC Jinling Company, the study on the selection and mechanism of adsorbents for the recovery of phenol by the fixed bed adsorption method was carried out. The adsorption properties of 3A molecular sieves, 13X molecular sieves, γ-Al2O3 and three activated carbons to phenol were investigated. The results showed that γ-Al2O3 and molecular sieves showed poor adsorption performance due to their polarity. Among them, 3A molecular sieves had the worst adsorption performance because the pore size was smaller than the molecular dynamic diameter of phenol, and activated carbon had the best adsorption performance due to its non-polar surface. It is further found that the pore structure, surface properties and surface oxygen content of activated carbon also have a significant impact on the adsorption performance. Food charcoal with uniform pore distribution, small pore size, clear structure and low surface oxygen content has the biggest adsorption capacity. A Yoon-Nelson kinetic model was established, which could well simulate the adsorption and penetration process of phenol in the activated carbon bed, and provides a direction for drawing the phenol adsorption penetration curve in the future.