The Treatment Of Wastewater Containing Phenol From Cumene-Phenol Process By Hollow Fiber Renewal Liquid Membrane Technique

With the rapid development of industry，there is a large amount ofindustrial effluents containing phenol every year in China. It is not onlyharm to human health，but also making serious environment problems.Phenols occur in aqueous waste streams from many industrial processes,such as cumene-phenol process, petroleum refining, petrochemicalmanufacture, coal gasification and coal liquefaction processes. Phenolindustry is the focus of phenol pollution control for its high phenolconcentration generation. The existing method of phenol extraction toweruse cumene as extractant has some inherent disadvantages, including hugeequipment, large consumption and hard to meet the discharge standard，etc.So it is important to find an efficient method which is promising to beindustrialized to treat this kind of wastewater.The simulated solution was treated using hollow fiber renewalmembrane (HFRLM) technology. The solvent extraction experiments wereperformed for the determination of liquid membrane phase with usingcumme as extractant. The system was used to investigate the influence ofhydrodynamic characteristic (flow rates，operate conditions)，interfacechemical reaction (initial pH in feed phase，stripping phase acid，types ofstripping reagent)，composition of the liquid membrane (concentration of carrier， aqueous/organic volume ratio), etc.on the mass transferperformance of HFRLM process.The results show that after30minutes，liquid membrane runs insteady operation. Separation efficiency and mass transfer coefficient arestable with pH value ranging from1to6，nearly0when higher than7.The separation efficiency decreases with increasing the concentration ofphenol in feed phase. The stripping and the cumene reuse experiments ofthe extractant show that cumene performs well in phenol stripping and theextraction ability was not reduced. Thus, cumene could be used to removephenol from the waste water which phenol-producing plants produced.Transfer flux，separation efficiency and mass transfer coefficient increasewith increasing NaOH concentration rapidly when the concentration ofNaOH solution is below0.3mol/L. When above0.3mol/L, these changescan not be seen significantly. The best result of separation appeared wheno/w is1:20.The removal efficiency of phenol increases with the enhancingof flow rate in shell side but slows down after0.006m/s. It decreases withincreasing the flow rate of tube side. Up to5th stage，the removalefficiency of phenol is up to99%，the phenol concentration in the outlet offeed phase is less than5mg/L，which is lower than discharge standard ofwater pollutants. The enrichment factor of phenol in stripping phase isnearly up to500.The results prove that HFRLM could successfully separatephenol from water with cumene as extraction agent.This study supplies experimental data for further investigation and theindustrialization of HFRLM.