An integrated process for treating alkaline wash water effluent from nitroaromatic manufacture, principally containing nitro-hydroxy-aromatic compounds is described. The integrated process concentrates the alkaline wash water to recover chemicals and water prior to treating the concentrate through supercritical water oxidation. The supercritical water oxidation step consists of treating the concentrate in the presence of an oxygen source at conditions, which are supercritical for water to cause a substantial portion of the organic component of the concentrate to oxidize. The product effluent includes a gaseous component and a clean water component, and in the event that insoluble ash is formed, an ash component. The new integrated process results in reduced chemical and water consumption compared to existing processes. In addition, the treated wash water effluent can be recycled to process or directly discharged.
描述了一种处理硝基
芳烃制造过程中产生的碱性洗涤
水废
水的综合工艺,主要含有硝基羟基
芳烃化合物。在通过超临界
水氧化处理浓缩物之前,该综合工艺将碱性洗涤
水浓缩,以回收
化学品和
水。超临界
水氧化步骤包括在氧源存在的条件下处理浓缩物,氧源为超临界
水,使浓缩物中的大部分有机成分氧化。产品流出物包括气体成分和净
水成分,如果形成不溶性灰烬,则包括灰烬成分。与现有工艺相比,新的集成工艺减少了
化学品和
水的消耗。此外,经过处理的清洗废
水可循环用于加工或直接排放。