采用缓和湿式氧化工艺处理乙烯废碱液和炼油废碱渣

Treatment of Waste Alkali Lye Containing Ethene and Refinery Alkaline Residue with Mild Wet Oxidation Method

介绍了缓和湿式氧化法处理乙烯废碱液和炼油废碱渣的工艺原理和流程。由试验结果可以看出,利用此工艺处理乙烯废碱液和炼油废碱渣时,反应温度、停留时间不同,S2-去除率和反应产物也不同。在反应温度为120 ℃时,S2-的氧化产物以S2O32-的形式存在;当反应温度升高到150 ℃后,S2-的氧化产物以S2O32-和SO42-的形式并存;在反应温度达到180 ℃后,生成的S2O32-基本上完全转化为SO42-离子。在适宜的工艺条件(反应温度120 ℃,停留时间不低于40 min)下,混合废碱液或乙烯废碱液中S2-的排放浓度可降至2 mg/L以下。

The technology and flowsheet of the mild wet oxidation method for treating waste alkali lye containing ethene and alkaline residue are introduced in this paper. The tested results showed that the removal rate of sulfide and reaction products varied with the reaction temperature and retention time in the treating process of waste alkali lye containing ethene and refinery alkaline residues using this method. The sulfide concentration in the mixed waste alkali lye or the waste alkali lye containing ethene can be reduced to 2 mg/L under the suitable conditions of 120 ℃in temperature and 40 minutes in retention time.