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

Fu Churui; Qu Sijian; Dong Weiguo; Gao Minglong; Wang Jikun

doi:10.13226/j.issn.1006-6772.2017.03.019

Abstract：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.