乙烯废碱液脱硫处理研究进展  

Advances in desulfurization treatment of spent caustic liquid from ethylene cracking

作　　者：黄伟欣 李梦闪 孙伟[1,2] 曹学锋[1,2] 唐鸿鹄[1,2] Huang Weixin;Li Mengshan;Sun Wei;Cao Xuefeng;Tang Honghu(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Hunan Key Laboratory for Clean and Efficient Utilization of Calcium-Containing Mineral Resources,Central South University,Changsha 410083,China)

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]中南大学战略含钙矿物资源清洁高效利用湖南省重点实验室,湖南长沙410083

出　　处：《工业水处理》2021年第4期1-6,共6页Industrial Water Treatment

基　　金：国家自然科学基金项目(52004335);国家自然科学基金重点项目(51634009);湖南省自然科学基金项目(2020JJ5747);湖南省重点实验室(2018TP1002)。

摘　　要：乙烯废碱液产自石油化工的核心工序,主要包括Na_(2)S、硫醇、硫酚醚等污染物质,具有高碱度、高盐、高硫化物含量等特点,对水体和生态环境造成潜在威胁。总结了乙烯废碱液的产出过程、组成特点和处理重难点,分析了现有乙烯废碱液脱硫处理手段如直接处理法、中和法、氧化法、沉淀法、生物法及综合利用法等的工艺过程和技术特点。基于沉淀法脱硫和沉淀浮选技术,提出了矿物沉淀—浮选脱硫的协同处理技术原型,为乙烯废碱液的经济高效脱硫提供新思路。Spent caustic liquid from ethylene cracking is produced from the core process of petrochemical industry,mainly including Na_(2)S,mercaptan,thiophenol ether and other pollutants.It has the characteristics of high alkalinity,high salt concentration,high sulfide content and so on,which is a potential threat to water and ecological environment.The generation process,composition characteristics,key and difficult points of treatment of spent caustic liquid from ethylene cracking was summarized.The processes and technical characteristics of existing main desulfurization methods such as direct processing,neutralization,oxidation,precipitation,biological and comprehensive treatment were reviewed.Based on the precipitation desulfurization and precipitate flotation technology,a novel collaborative processing technology prototype on desulfurization spent caustic liquid from ethylene cracking by mineral precipitation and floatation separation was proposed,which provided a new idea for the cost-effective treatment of that waste liquid.

关 键 词：乙烯废碱液 脱硫 矿物沉淀 沉淀浮选 无害化处理 

分 类 号：X703[环境科学与工程—环境工程]