沉淀剂对液态烃碱渣中硫化物的去除特性

Removal characteristics of sulfide from liquid hydrocarbon alkali residue by precipitators

为探究化学沉淀法对液态烃碱渣中硫化物的去除特性,以ZnSO_(4)·7H_(2)O、FeSO_(4)·7H_(2)O、CuSO_(4)和CuO为沉淀剂,分别研究了沉淀剂种类、沉淀剂用量、搅拌时间及静置沉降时间对硫化物去除效果的影响。实验结果表明:当选择CuO为沉淀剂、CuO用量为12 g/L、搅拌时间为20 min、静置沉降时间为3 h时,硫化物去除率可达99.27%;CuO沉淀脱硫对有机物有一定的去除效果,COD去除率可达35.12%,且实际沉淀生成量高于理论沉淀生成量。沉淀相的XRD分析结果表明沉淀中的硫主要以CuS和Cu2S的形式存在,FTIR分析结果表明沉淀相中存在有机硫及其他有机物。

To explore the removal characteristics of sulfide from liquid hydrocarbon alkali residue by chemical precipitation,ZnSO_(4)·7H_(2)O、FeSO_(4)·7H_(2)O,CuSO_(4) and CuO were selected as precipitating agents,and the effects of precipitant type,precipitant amount,stirring time and settling time on sulfide removal were investigated respectively.The experimental results show that:The removal rate of sulfide can reach 99.27%when CuO is selected as the precipitant,the CuO amount is 12 g/L,the stirring time is 20 min,and the settling time is 3 h;Some organic matter can be removed with CuO precipitation desulfurization,the COD removal rate can reach 35.12%,and the actual precipitation generation is higher than the theoretical value.The XRD analysis results of the precipitated phase show that the sulfur in the precipitation is mainly in the form of CuS and Cu2S,and the FTIR analysis results indicate the presence of organic sulfur and other organic compounds in the precipitated phase.