低分子醇-盐-水相体系在草甘膦母液资源化过程中的应用研究

Application of low molecular weight alcohol-salt-water phase system in the resource processing of glyphosate mother liquor

双水相体系在物质分离纯化方面的应用越来越广泛。以企业副产草甘膦母液资源最大化为最终目标,考察了不同p H下,不同低分子醇在溶液体系中的分配系数。以相比代替原有的分配系数和回收率,简化了筛选步骤,确定了体系分相效果最佳有机溶剂为正丙醇。常规色谱法分析确定母液中回收的产品为三乙胺盐酸盐,探讨了母液与正丙醇的体积比、体系的p H、碱和盐用量、萃取次数及萃取顺序对三乙胺盐酸盐回收率的影响,确定了最优生产工艺。该工艺能够有效减少企业的废水排放总量,实现了草甘膦母液的低成本资源化。

Aqueous two-phase system（ ATPS） is widely used in substance separation and purification. The partition coefficients of low molecular weight alcohols are studied under different p H conditions. The phase separation effect is evaluated by ratio of two phases instead of distribution coefficient and recovery percent. In order to find the best method for resources of glyphosate mother liquor,n-propanol is suggested as the best phase organic solvent. The recovery product is identified as triethylamine hydrochloride by chemical analysis,FT-IR,TEM and XRD spectra analysis. The process parameters such as p H,volume ratio of the mother liquor and n-propanol,the amount of sodium hydroxide and sodium chloride,extracting times and orders are discussed and optimized. With this technology,the total amount of wastewater is greatly reduced and the utilization of resourcing glyphosate mother liquor at low cost is also achieved.