在MTO（甲醇制烯烃）催化剂专用载体SAPO-34分子筛生产过程中，因使用有机胺类模板剂三乙胺，产生大量含胺废水。园区及地方环保标准要求外排废水COD≤500 mg/L、TOC≤200 mg/L，部分地区对三乙胺特征污染物排放限值更是低至5.0 mg/L，常规处理工艺难以稳定达标。针对SAPO-34分子筛生产含胺废水，采用树脂吸附耦合蒸汽吹脱组合工艺，实现三乙胺高效富集与资源化回收。实验结果显示，废水中三乙胺质量浓度由120 mg/L降至20 mg/L以下，有机胺总回收率达90%以上，为含胺废水达标处理与模板剂资源化利用提供了经济可行的技术方案。
关键词: SAPO-34分子筛 / 含胺废水 / 三乙胺 / 树脂吸附 / 蒸汽吹脱 / 资源化回收
Abstract:
During the production of SAPO-34 molecular sieve, a special support for MTO (methanol-to-olefin) catalyst, a large amount of amine-containing wastewater is generated due to the use of triethylamine, an organic amine template agent. Industrial parks and local environmental standards require COD ≤ 500 mg/L and TOC ≤ 200 mg/L in the effluent, and the emission limit for triethylamine as a particular pollutant is as low as 5.0 mg/L in some regions, making it difficult for conventional treatment processes to meet the standards stably. In this study, a combined process of resin adsorption with steam stripping is adopted for the amine-containing wastewater from SAPO-34 molecular sieve production, realizing efficient enrichment and resource recovery of triethylamine. Experimental results show that the mass concentration of triethylamine in wastewater is reduced from 120 mg/L to below 20 mg/L, and the total recovery rate of organic amines reaches more than 90%. This provides an economically feasible technical scheme for the up-to-standard treatment of amine-containing wastewater and resource utilization of template agents.
Keywords: SAPO-34 molecular sieve / amine-containing wastewater / triethylamine / resin adsorption / steam stripping / resource recovery