EXTRACTION METHOD AND EXTRACTANT FOR DENITRATION PROCESS IN H ACID PRODUCTION PROCESS

摘要

An extraction method and an extractant for a denitration process in a H acid production process. First, an extractant is formulated. The extractant comprises a solvent, a diluent, and a cosolvent. The cosolvent is 2-ethylhexyl 2-ethylhexyl phosphate, the solvent is a tertiary amine solvent, and the diluent is one or more of sulfonated kerosene, benzene, or toluene. Subsequently, the extractant is used to extract a denitrate, and a complex layer and an inorganic acid/water layer are formed after extraction. The inorganic acid/water layer is separated and subsequently applied to an H acid segregation step, the complex layer is stripped, a stripping agent is added for stripping to form an organic substance/water phase having a pH of 7-9. The denitrate forms a trisodium salt, the solution is stratified by standing, an organic layer is separated, and a solvent layer is subsequently applied.