Separation of aqueous phenol through polyurethane membranes by pervaporation

Abstract

ABSTRACT:The separation of a phenol-water mixture using a polyurethane membrane by a pervaporation method was investigated. Polyurethane was selected as a membrane material because its affinity for phenol was considered to be high. Polyurethane was prepared by the polyaddition of 1,6-diisocyanatohexane and polytetramethyleneglycol. The polyurethane layer was sandwiched with a porous polypropylene membrane (Celgard 2500). Pervaporation measurement was carried out under vacuum on the permeate side, and the permeate vapor was collected with a liquid nitrogen trap. The phenol concentration in the permeate solution increased from 0 to 65 wt % with increasing feed concentration of phenol from 0 to 7 wt %. The total flux also increased up to 930 g m 02 h 01 with increasing phenol partial flux. In the sorption measurement at 60ЊC, the concentration of phenol in the membrane was 68 wt %, which was higher than that of the permeate solution. Therefore, it was considered that the phenol selectivity was based on high solubility in the polyurethane membranes.

Technologies for the removal of phenol from fluid streams: A short review of recent developments

“…The separation of a phenol-water mixture using a polyurethane membrane by a pervaporation method was investigated by Hoshi et al [49]. The polyurethane layer was sandwiched with a porous polypropylene membrane (Celgard ® 2500).…”

Thermodynamic and mechanistic studies on recovering phenol crystals from dilute aqueous solutions using pervaporation–crystallization coupling (PVCC) system

“…It is thus of interest to study the effect of permeate pressure on the separation performance. The influence of downstream pressure on the separation factor and partial fluxes of phenol and water with conventional pervaporation process has been tested (Böddeker et al, 1990;Hoshi et al, 1997;Ten and Field, 2000). However, the effects of the downstream permeate pressure on the performance of the novel PVCC process for recovering phenol crystals are yet to be investigated.…”

“…Pervaporation, on the other hand, is a continuous process that can separate phenol from a broad range of feed concentrations, and no additives are needed (Lipnizki et al, 1999;Shao and Huang, 2007). Therefore, pervaporation has attracted significant attention for the separation and recovery of phenol from industrial wastewater (Böddeker et al, 1990;Hoshi et al, 1997;Roualdes et al, 2003;Kujawski et al, 2004;Das et al, 2008;Yahaya, 2009;Ye and Wang, 2013). Most research work reported in the literature is concentrated on modification of existing membrane polymers or developing new membrane materials with high selectivities.…”

High-efficiency catalytic degradation of phenol based on the peroxidase-like activity of cupric oxide nanoparticles

“…Due to its high toxicity and hard degradation, phenol has been listed as one of the priority control pollutants by the environmental protection agency in many countries. A variety of techniques such as solvent extraction (Li et al 2004), physical adsorption (Burleigh et al 2002;Dabrowski et al 2005), pervaporation (Hoshi et al 1997), wet air oxidation (Joglekar et al 1991;Chen et al 2001), ozonolysis (Chedeville et al 2007), wet peroxide oxidation (Barrault et al 2000;Kang et al 2002;Calleja et al 2005;Gonzalez et al 2008), electrochemical oxidation (Li et al 2005;Pacheco et al 2007), photocatalytic oxidation (Vione et al 2005;Wang et al 2005), supercritical water gasification (Dileo et al 2007), electrical discharge degradation (Liu and Jiang 2005), and biodegradation (Jiang et al 2006;Ucun et al 2010) have been developed to remove phenol from industrial wastewaters. Each method has its own advantages and disadvantages and can be only applied in speculate conditions.…”