Complex extraction of phenol from coal gasification wastewater with tributyl phosphate

doi:10.16085/j.issn.1000-6613.2020-1219

Abstract

Abstract:

The extraction of phenol from coal gasification wastewater with tributyl phosphate (TBP)-n-octanol was studied. The effects of complexing agent concentration and reaction temperature on the extraction distribution coefficientwere studied to determine the enthalpy of complex structures and reactions. Finally, the distribution coefficient mathematical model of phenol extraction was establishedbased onliquid-liquid extraction models, and the accuracy of the model was verified by using coal gasification wastewater as an experimental sample.The results show that when the volume fraction of TBP increased from 10% to 50%, the partition coefficient increased from 17.6 to 61.4, when the temperature increased from 30℃ to 70℃, the partition coefficient decreased from 42.9 to 34.7; the concentration affected the partition coefficient model and the average relative error was controlled at 1.14%; the temperature affected the partition coefficient model and the average relative error was controlled at 0.87%. Through the comparison of model estimates and actual experimental values, it can be considered that the extraction partition coefficient model has high reliability in predicting the coal gasification wastewater extraction partition coefficient.

Key words: coal gasification wastewater, phenol, TBP, n-octanol, partition coefficient model

摘要：

研究了磷酸三丁酯（TBP）-正辛醇萃取煤气化废水中的酚。实验考察了TBP浓度、温度对萃取过程中分配系数的影响规律，确定了萃取产物的结构组成及反应焓变，通过液液萃取模型理论建立了TBP萃取酚的分配系数模型，且以煤气化废水为实验水样验证了分配系数模型的准确性。结果表明：TBP浓度越大，萃取分配系数越大，当TBP体积分数由10%增至50%时，萃取分配系数由17.6增至61.4；温度升高，萃取分配系数降低，温度由30℃升至70℃时，萃取分配系数由42.9降至34.7；TBP浓度对萃取分配系数模型有影响，且平均相对误差控制在1.14%；温度对萃取分配系数模型有影响，且平均相对误差控制在0.87%。通过模型预估及实际实验值的对比，该萃取分配系数模型在预测煤气化废水萃取分配系数上具有较高的可信度。

关键词: 气化废水, 酚, 磷酸三丁酯, 正辛醇, 分配系数模型

CLC Number:

X703

Jikun WANG, Yang LI. Complex extraction of phenol from coal gasification wastewater with tributyl phosphate[J]. Chemical Industry and Engineering Progress, 2020, 39(12): 5309-5315.

王吉坤, 李阳. 磷酸三丁酯络合萃取煤气化废水中的酚[J]. 化工进展, 2020, 39(12): 5309-5315.

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