A novel method for breaking emulsions with microporous membranes is presented.A membrane would act as a coalescer if its pore size is smaller than the emulsion droplets and if the dispersed phase has great affinity to...A novel method for breaking emulsions with microporous membranes is presented.A membrane would act as a coalescer if its pore size is smaller than the emulsion droplets and if the dispersed phase has great affinity to the membrane.It was observed that a hydrophilic membrane is able to break water in oil emulsions with high separation efficiency.Effects of the membrane pore size,membrane thickness,transmembrane pressure and emulsion composition on demulsification performance were investigated.It was found that the membrane pore size and transmembrane pressure affect demulsification performance remarkably while other factors have slight or almost no effect.展开更多
Demulsification of emulsified water-in-oil droplets was worked out with the employment of wetting coalescence materials. Demulsification is carried out in conventional stirred-column and packed-column. Among the four ...Demulsification of emulsified water-in-oil droplets was worked out with the employment of wetting coalescence materials. Demulsification is carried out in conventional stirred-column and packed-column. Among the four kinds of natural fibers and two kinds of inorganic materials tested, natural fiber A, originated from wood shavings was found to give the best performance of demulsification. The demulsification efficiency can exceed 96.5% when demulsification conditions are optimized. The packed-column showed much better performance both in terms of demulsification efficiency and repeated use of the recovered oil phase for extracting cadmium in simulated wastewater. Operating variables governing the demulsification efficiency were investigated.展开更多
A study on the membrane coalescence demulsification was carried out with four working systems of water/n-butyl alcohol, water/n-octanol, water/30% TBP(in kerosene) and water/kerosene. The membranes made of polytetrafl...A study on the membrane coalescence demulsification was carried out with four working systems of water/n-butyl alcohol, water/n-octanol, water/30% TBP(in kerosene) and water/kerosene. The membranes made of polytetrafluoroethylene (PTFE) with 1.0μm pore size were used. The results indicated that the excellent demulsification efficiency for emulsions with various oil contents was obtained. A conductivity probe was used to study the demulsification mechanism. An electrode probe was designed and used to determine the oil content near the membrane surface. The obtained data showed that the oil content in the permeated stream was much higher than that in the feed emulsion. A physical mechanism to explain the membrane demulsification was put forward.展开更多
文摘A novel method for breaking emulsions with microporous membranes is presented.A membrane would act as a coalescer if its pore size is smaller than the emulsion droplets and if the dispersed phase has great affinity to the membrane.It was observed that a hydrophilic membrane is able to break water in oil emulsions with high separation efficiency.Effects of the membrane pore size,membrane thickness,transmembrane pressure and emulsion composition on demulsification performance were investigated.It was found that the membrane pore size and transmembrane pressure affect demulsification performance remarkably while other factors have slight or almost no effect.
文摘Demulsification of emulsified water-in-oil droplets was worked out with the employment of wetting coalescence materials. Demulsification is carried out in conventional stirred-column and packed-column. Among the four kinds of natural fibers and two kinds of inorganic materials tested, natural fiber A, originated from wood shavings was found to give the best performance of demulsification. The demulsification efficiency can exceed 96.5% when demulsification conditions are optimized. The packed-column showed much better performance both in terms of demulsification efficiency and repeated use of the recovered oil phase for extracting cadmium in simulated wastewater. Operating variables governing the demulsification efficiency were investigated.
基金Supported by the National Natural Science Foundation of China(No.29976021).
文摘A study on the membrane coalescence demulsification was carried out with four working systems of water/n-butyl alcohol, water/n-octanol, water/30% TBP(in kerosene) and water/kerosene. The membranes made of polytetrafluoroethylene (PTFE) with 1.0μm pore size were used. The results indicated that the excellent demulsification efficiency for emulsions with various oil contents was obtained. A conductivity probe was used to study the demulsification mechanism. An electrode probe was designed and used to determine the oil content near the membrane surface. The obtained data showed that the oil content in the permeated stream was much higher than that in the feed emulsion. A physical mechanism to explain the membrane demulsification was put forward.
