沉淀-氧化法处理乙烯废碱液

doi:10.16085/j.issn.1000-6613.2018-2231

摘要/Abstract

摘要：

采用沉淀-氧化法处理乙烯废碱液中的硫化物，考察了影响脱硫效果的各种因素。在n(CuSO₄)∶n(Na₂S)=1.1∶1、温度为40℃、时间为0.5h条件下，沉淀法脱硫后碱液残留的S^2-浓度为0.04g/L；然后进一步采用双氧水氧化处理脱硫后碱液，在氧化反应温度为40℃、时间为2h、氧化剂双氧水用量为1.0mL/L废碱液时，乙烯废碱液中的S^2-浓度可降至1mg/L以下，达到湿式氧化的处理效果和烟气脱硫对乙烯废碱液的要求。同时硫酸铜湿法氧化再生研究结果表明：在硫化铜浆液质量分数为15%、pH=3、氧分压为0.5MPa、温度为200℃、时间为0.5h的条件下，硫酸铜再生彻底，实现了硫酸铜的循环利用。

关键词: 乙烯, 废碱液, 脱硫, 沉淀, 氧化, 湿法氧化

Abstract:

Precipitation-oxidation process was used to treat sulfide in ethylene waste lye. The factors affecting removing efficiency were investigated. Under the condition of n(CuSO₄)∶n(Na₂S)=1.1∶1、temperature 40℃ and 2h, S^2- in lye residue after desulfurization by precipitation was 0.04g/L. Then the lye after desulphurization was further treated by oxidation with hydrogen peroxide. When the oxidation reaction temperature is 40℃, the time is 2h, and the amount of oxidant hydrogen peroxide is 1.0mL/L waste lye, The S^2- in ethylene waste lye could be reduced to below 1mg/L, and it meets the treatment effect of wet oxidation technology and the requirements of flue gas desulfurization for ethylene waste lye. At the same time, wet oxidation regeneration of copper sulfate was also studied. The results showed that: under the conditions of 15% concentration of copper sulfide slurry, pH=3, oxygen partial pressure of 0.5MPa, reaction temperature of 200℃, and reaction time of 0.5h, copper sulfate regeneration was complete. The recycling utilization of copper sulfate was realized.

Key words: ethylene, spent caustic, desulfurization, precipitation, oxidation, hydrometallurgy

中图分类号:

X789

王凤荣,马克存,王天成,杜龙弟,郭桂悦. 沉淀-氧化法处理乙烯废碱液[J]. 化工进展, 2019, 38(08): 3896-3901.

Fengrong WANG,Kecun MA,Tiancheng WANG,Longdi DU,Guiyue GUO. Treatment of ethylene waste lye by precipitation-oxidation[J]. Chemical Industry and Engineering Progress, 2019, 38(08): 3896-3901.

图/表 8

图1 硫酸铜用量对脱硫率的影响

图2 反应温度和反应时间对脱硫率的影响

图3 温度和时间对硫酸铜再生的影响

图4 pH对硫酸铜再生的影响

图5 氧分压对硫酸铜再生的影响

图6 浆液浓度对脱硫沉淀转化效果的影响

图7 双氧水用量对氧化效果的影响

图8 温度和时间对氧化效果的影响

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