煤化工废水萃取脱酚流程模拟

为提高煤化工高浓度含酚废水萃取脱酚的处理效果,减轻废水排放环境污染,采用Aspen Plus流程模拟软件对煤化工废水萃取脱酚流程进行了优化设计。模拟采用真实煤化工废水的组成设置物流数据,废水进料流量为100 t/h,温度为40℃,压力为0.1 MPa,并利用UNIQUAC和NRTL活度系数模型,分别对萃取脱酚塔、溶剂回收塔、溶剂汽提塔进行了参数调整。模拟结果表明,当萃取脱酚塔萃取级数n=6,萃取相比R=1∶4时;溶剂回收塔的理论塔板数N=10,进料位置为第5块塔板时;溶剂汽提塔的理论塔板数N=5,进料位置为第1块塔板时,废水总酚浓度从18 600 mg/L降至400mg/L以下,单元酚浓度从14 000 mg/L降低至50 mg/L以下,萃取剂回收利用率达到99%以上。

Process simulation of extraction and removal of phenol from coal chemical wastewater

In order to improve the efficiency of extraction and removal of phenol from coal chemical wastewater and reduce the environmental pollution from wastewater discharge,Aspen Plus was used to optimize the extraction and de-phenol removal process.The logistics data used in simulation was from actual compositions of coal chemical wastewater,and its feed flow was 100 t/h,at temperature of 40 ℃ and pressure of 0.1 MPa.The parameters of the extraction column,the solvent recovery column and the solvent stripping column were adjusted by using the UNIQUAC and NRTL activity coefficient models respectively.Results show that the total phenol concentration of the wastewater is reduced from 18 600 mg/L to below 400 mg/L,and moreover the phenol concentration is reduced from 14 000 mg/L to below 50 mg/L,the recovery rate of extraction agent is over 99％,when the parameter is set as follows:the extraction tower series and solvent ratio of extraction column are 6 and 1 ∶ 4,respectively,the theoretical plate numbers and feed position of the solvent recovery column are 10 and the fifth tray respectively,as well as the theoretical plate number and feed position of the solvent stripping column are 5 and the first tray.