The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Wei Liu - One of the best experts on this subject based on the ideXlab platform.
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Enhancement of the quinoline separation from pyridine: Study on competitive adsorption kinetics in Foam Fractionation with salt
Chemical Engineering Journal, 2019Co-Authors: Di Huang, Wei Liu, Hao Yin, Cong Wang, Siyu Zhang, Shaojie Qin, Chunyan YangAbstract:Abstract Large amount of N-heterocycles are produced by various industries and most of them are extremely harmful toxicants. In the current work, the selective removal of quinoline and pyridine from their binary diluted aqueous solution by using a novel technology of Foam Fractionation with salt was investigated. In continuous Foam Fractionation, quinoline and pyridine could exert competitive adsorption when sodium dodecyl sulfate (SDS) was used as the collector. The influence mechanism of the salts on the competitive adsorption of quinoline and pyridine were elaborated through adding monovalent metal salts (NaCl and KCl) and bivalent metal salts (CaCl2 and MgCl2). In the stripping mode of Foam Fractionation with or without KCl, the competitive adsorption between quinoline and pyridine were determined by using Thomas adsorption kinetics models. Finally, a novel two-stage Foam Fractionation technology was developed to successively remove of quinoline and pyridine from their binary aqueous solution. The removal percentage and purity of quinoline in the first stage were 90.50% and 89.57%, respectively. After a second stage Foam Fractionation, the removal percentage of pyridine and the total removal percentage of quinoline could reach as high as 94.72% and 97.38%, respectively.
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Foam Fractionation for the concentration of exopolysaccharides produced by repeated batch fermentation of cordyceps militaris
Separation and Purification Technology, 2019Co-Authors: Huijie Zheng, Wei Liu, Mengmeng Hao, Zheng Wancheng, Yingying, Shaoxiong FanAbstract:Abstract For improving the yield of exopolysaccharides (EPSs) produced by Cordyceps militaris and the efficiency of downstream separation technology, a combination technology of repeated batch fermentation and two-stage Foam Fractionation was designed. First, the suitable parameters of repeated batch fermentation (RBF) were determined. The results showed that the suitable broth replacement time point and replacement ratio were fifth day and 80% (v/v), respectively. The fermentation of Cordyceps militaris was performed for five cycles without a significant loss of fermentability, and the fermenting time decreased from 25 days to 13 days through RBF strategy. Then, the replacement broth was used as the feeding solution of Foam Fractionation. The effects of mycelia, tween 80 and volumetric air flowrate on the performance of Foam Fractionation were investigated, respectively. Under the suitable operating conditions, the total enrichment ratio of EPSs in the two-stage Foam Fractionation reached as high as 7.12.
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Desalination for enhancing the recovery of creatine from its wastewater by Foam Fractionation
Journal of Molecular Liquids, 2018Co-Authors: Di Huang, Huijie Zheng, Wei Liu, Lei JiaAbstract:Abstract Creatine has been regarded as an essential dietary supplement due to its function of auxiliary energy supplement for muscles and neurons. Therefore, it is economical to effectively recover creatine from its wastewater by a separation technology with the characters of low energy consumption and environmental compatibility. In this work, a novel two-stage Foam Fractionation technology was developed for the desalination of the residual reactants and the effective recovery of creatine from its wastewater, successively. In the first stage, S-methylisothiourea sulfate was effectively removed into the Foamate. Then, creatine was diluted and discharged into the storage tank with the creatine concentration of 1.5 g/L. In the second stage, a Foam Fractionation column with a vertical ellipsoid-shaped Foam channel was used to concentrate creatine from the residual solution of the first stage. Under the optimal operating conditions, the enrichment ratio and the recovery percentage of creatine could reach as high as 25.3 and 83.3%, respectively. Through the two-stage Foam Fractionation, the total recovery percentage of creatine could achieve above 77.9%.
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The separation of catechol and phenol with each other by two-stage batch Foam Fractionation
Chemical Engineering Journal, 2017Co-Authors: Di Huang, Wei Liu, Yanli Zhao, Linlin Ding, Hao Yin, Huijie ZhengAbstract:Abstract A great amount of phenolic compounds are considered as carcinogens even at low concentrations and they are highly toxic and widely coexist in effluent discharges. It is a very meaningful work to respectively separate a few trace phenolic compounds from their aqueous solution by Foam Fractionation. The studies of surface activity and surface excess revealed that catechol had a stronger competitive adsorption on the bubble surface than phenol by using cetyltrimethyl ammonium bromide (CTAB) as a collector. A two-stage batch Foam Fractionation technology was developed for the respective separation of catechol and phenol from their diluted aqueous solution. In the first stage batch Foam Fractionation, catechol was effectively separated with a high enrichment ratio of 32.2 and a high removal percentage of 90.25% while the removal percentage of phenol was only 2.32% under the suitable operating conditions. A high selectivity coefficient of catechol over phenol could reach 35.25. Then, phenol existed in the residual solution, which was used as the feeding solution in the second stage. In the second stage batch Foam Fractionation, the small bubbles were used to enhance the adsorption of phenol. At the same time, the Foam Fractionation column of an inclined Foam phase was used to enhance Foam drainage and then phenol was effectively removed with a high enrichment ratio of 44.4 and a high removal percentage of 90.23% under the suitable operating conditions. The results indicated that it was practicable to successfully and respectively separate catechol and phenol from their aqueous solution by using the two-stage batch Foam Fractionation.
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Separation of soybean saponins from soybean meal by a technology of Foam Fractionation and resin adsorption
Preparative biochemistry & biotechnology, 2016Co-Authors: Jianxing Jiang, Shenghao Guo, Wei Liu, Yanfei Gao, Shufang KangAbstract:ABSTRACTFoam Fractionation and resin adsorption were used to recover soybean saponins from the industrial residue of soybean meal. First, a two-stage Foam Fractionation technology was studied for concentrating soybean saponins from the leaching liquor. Subsequently, resin adsorption was used to purify soybean saponins from the Foamate in Foam Fractionation. The results showed that the enrichment ratio, the recovery percentage, and the purity of soybean saponins by using the two-stage Foam Fractionation technology could reach 4.45, 74%, and 67%, respectively. After resin adsorption and desorption, the purity of soybean saponins in the freeze-dried powder from the desorption solution was 88.4%.
Di Huang - One of the best experts on this subject based on the ideXlab platform.
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Enhancement of the quinoline separation from pyridine: Study on competitive adsorption kinetics in Foam Fractionation with salt
Chemical Engineering Journal, 2019Co-Authors: Di Huang, Wei Liu, Hao Yin, Cong Wang, Siyu Zhang, Shaojie Qin, Chunyan YangAbstract:Abstract Large amount of N-heterocycles are produced by various industries and most of them are extremely harmful toxicants. In the current work, the selective removal of quinoline and pyridine from their binary diluted aqueous solution by using a novel technology of Foam Fractionation with salt was investigated. In continuous Foam Fractionation, quinoline and pyridine could exert competitive adsorption when sodium dodecyl sulfate (SDS) was used as the collector. The influence mechanism of the salts on the competitive adsorption of quinoline and pyridine were elaborated through adding monovalent metal salts (NaCl and KCl) and bivalent metal salts (CaCl2 and MgCl2). In the stripping mode of Foam Fractionation with or without KCl, the competitive adsorption between quinoline and pyridine were determined by using Thomas adsorption kinetics models. Finally, a novel two-stage Foam Fractionation technology was developed to successively remove of quinoline and pyridine from their binary aqueous solution. The removal percentage and purity of quinoline in the first stage were 90.50% and 89.57%, respectively. After a second stage Foam Fractionation, the removal percentage of pyridine and the total removal percentage of quinoline could reach as high as 94.72% and 97.38%, respectively.
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Desalination for enhancing the recovery of creatine from its wastewater by Foam Fractionation
Journal of Molecular Liquids, 2018Co-Authors: Di Huang, Huijie Zheng, Wei Liu, Lei JiaAbstract:Abstract Creatine has been regarded as an essential dietary supplement due to its function of auxiliary energy supplement for muscles and neurons. Therefore, it is economical to effectively recover creatine from its wastewater by a separation technology with the characters of low energy consumption and environmental compatibility. In this work, a novel two-stage Foam Fractionation technology was developed for the desalination of the residual reactants and the effective recovery of creatine from its wastewater, successively. In the first stage, S-methylisothiourea sulfate was effectively removed into the Foamate. Then, creatine was diluted and discharged into the storage tank with the creatine concentration of 1.5 g/L. In the second stage, a Foam Fractionation column with a vertical ellipsoid-shaped Foam channel was used to concentrate creatine from the residual solution of the first stage. Under the optimal operating conditions, the enrichment ratio and the recovery percentage of creatine could reach as high as 25.3 and 83.3%, respectively. Through the two-stage Foam Fractionation, the total recovery percentage of creatine could achieve above 77.9%.
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removal of pyridine from its wastewater by using a novel Foam Fractionation column
Chemical Engineering Journal, 2017Co-Authors: Di Huang, Yanrui Chen, Zhaoliang Wu, Nan HuAbstract:Abstract Many of pyridine compounds are considered as typical hazardous refractory organics due to their acute toxic properties and teratogenic effects. Therefore, it is great significant to develop a separation technology with the characters of low energy consumption and environmental compatibility to efficiently remove pyridine from its wastewater. In this work, Foam Fractionation was used to remove pyridine from its wastewater and a novel Foam Fractionation column was designed for enhancing interfacial adsorption by vertical sieve tray and strengthening Foam drainage by floating tongue type tray, in which bubble diameter was monitored for adjusting feeding flow rate and air flow rate in the continuous Foam Fractionation process. By comparing the Foam properties and the adsorption properties of three anionic surfactants (sodium dodecyl sulfate, sodium alcohol ether sulfate and sodium alpha-olefin sulfonate), sodium dodecyl sulfate was chosen as the optimal collector to remove pyridine at pH 4.5. Under the optimal operating conditions, the enrichment ratio and removal percentage of pyridine could reach as high as 34.5 and 90.2%, simultaneously. Above results indicated that Foam Fractionation was a practicable technology to efficiently remove a hazardous material from its wastewater by designing an effective Foam Fractionation column.
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The separation of catechol and phenol with each other by two-stage batch Foam Fractionation
Chemical Engineering Journal, 2017Co-Authors: Di Huang, Wei Liu, Yanli Zhao, Linlin Ding, Hao Yin, Huijie ZhengAbstract:Abstract A great amount of phenolic compounds are considered as carcinogens even at low concentrations and they are highly toxic and widely coexist in effluent discharges. It is a very meaningful work to respectively separate a few trace phenolic compounds from their aqueous solution by Foam Fractionation. The studies of surface activity and surface excess revealed that catechol had a stronger competitive adsorption on the bubble surface than phenol by using cetyltrimethyl ammonium bromide (CTAB) as a collector. A two-stage batch Foam Fractionation technology was developed for the respective separation of catechol and phenol from their diluted aqueous solution. In the first stage batch Foam Fractionation, catechol was effectively separated with a high enrichment ratio of 32.2 and a high removal percentage of 90.25% while the removal percentage of phenol was only 2.32% under the suitable operating conditions. A high selectivity coefficient of catechol over phenol could reach 35.25. Then, phenol existed in the residual solution, which was used as the feeding solution in the second stage. In the second stage batch Foam Fractionation, the small bubbles were used to enhance the adsorption of phenol. At the same time, the Foam Fractionation column of an inclined Foam phase was used to enhance Foam drainage and then phenol was effectively removed with a high enrichment ratio of 44.4 and a high removal percentage of 90.23% under the suitable operating conditions. The results indicated that it was practicable to successfully and respectively separate catechol and phenol from their aqueous solution by using the two-stage batch Foam Fractionation.
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recovery of yam mucilage from the yam starch processing wastewater by using a novel Foam Fractionation column
Separation and Purification Technology, 2016Co-Authors: Hongzhen Li, Zhiqiang Li, Nan Hu, Zhaoliang Wu, Di HuangAbstract:Abstract It is difficult to separate a surface-active material from a wastewater with a high viscosity by Foam Fractionation. In order to solve the problem, a novel Foam Fractionation column with vertical sieve tray (VST) placed in the Foam phase was developed for effectively recovering yam mucilage from the viscous yam starch processing wastewater. The effects of design parameters of VST on its Foam drainage properties were investigated. The results showed that the suitable design parameters of VST were the number of trays in VST 5, the number of vertical sieve caps in each tray 4 and the number of sieve pores in each cap 28. Meanwhile, the suitable operating conditions were also determined. Under the conditions of pH 6.0, temperature 25 °C, volumetric air flow rate 50 mL/min and loading liquid volume 500 mL, the enrichment ratio and recovery percentage of yam mucilage were 5.70 and 91.21%, respectively, which were 3.77 and 1.55 times higher than those in the control column. The above results indicated that the novel Foam Fractionation column with VST in the Foam phase could simultaneously improve the enrichment ratio and the recovery percentage of yam mucilage by strengthening Foam drainage. This work was aimed at developing a novel Foam Fractionation column for effectively recovering a valuable byproduct from a viscous food processing wastewater and further facilitating the industrial application of Foam Fractionation in food industry.
Yanji Wang - One of the best experts on this subject based on the ideXlab platform.
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Role of Foam drainage in producing protein aggregates in Foam Fractionation.
Colloids and surfaces. B Biointerfaces, 2017Co-Authors: Yuran Zhang, Yunkang Chang, Yanji Wang, Xiang’e Chen, Tao WangAbstract:It is essential to obtain a clear understanding of the Foam-induced protein aggregation to reduce the loss of protein functionality in Foam Fractionation. The major effort of this work is to explore the roles of Foam drainage in protein aggregation in the entire process of Foam Fractionation with bovine serum albumin (BSA) as a model protein. The results show that enhancing Foam drainage increased the desorption of BSA molecules from the gas-liquid interface and the local concentration of desorbed molecules in Foam. Therefore, it intensified the aggregation of BSA in Foam Fractionation. Simultaneously, it also accelerated the flow of BSA aggregates from rising Foam into the residual solution along with the drained liquid. Because enhancing Foam drainage increased the relative content of BSA molecules adsorbed at the gas-liquid interface, it also intensified the aggregation of BSA during both the deFoaming process and the storage of the Foamate. Furthermore, enhancing Foam drainage more readily resulted in the formation of insoluble BSA aggregates. The results are highly important for a better understanding of Foam-induced protein aggregation in Foam Fractionation.
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β-Cyclodextrin preventing protein aggregation in Foam Fractionation of bovine serum albumin
Journal of biotechnology, 2016Co-Authors: Yanji Wang, Linlin Ding, Yanyan WangAbstract:In this work, β-cyclodextrin was developed to prevent protein aggregation in Foam Fractionation using bovine serum albumin (BSA) as a model protein. The role of β-cyclodextrin in preventing the aggregation of BSA induced by the gas-liquid interface was studied at the molecular level. The results indicate that by holding the exposed phenylalanine residues in its hydrophobic cavity, β-cyclodextrin effectively prevented the aggregation of BSA induced by the gas-liquid interface in Foam Fractionation. Furthermore, β-cyclodextrin could be effectively separated from BSA in the Foamate due to their weak association.
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β-cyclodextrin assisted two-stage Foam Fractionation of bromelain from the crude extract of pineapple peels
Industrial Crops and Products, 2016Co-Authors: Linlin Ding, Wei Liu, Yanji Wang, Yanyan WangAbstract:Abstract For reducing the costs of separating bromelain from its crude extract, a two-stage Foam Fractionation technology with β-cyclodextrin as an activity protector was developed using the Foam Fractionation column with vertical sieve trays (VSTs). By studying the effects of VSTs, volumetric air flowrate, β-cyclodextrin concentration, aeration time and temperature, the two-stage Foam Fractionation technology were optimized. The results show that VSTs effectively improved the activity recovery by enhancing the adsorption of bromelain at the gas-liquid interface while β-cyclodextrin significantly reduced the activity loss induced by the gas-liquid interface. At β-cyclodextrin concentration 0.60 mg/mL, a high specific activity of 165.6 U/mg, 7.4 folds of that in the crude extract, was obtained with an activity recovery of 45.2% by using the optimized two-stage Foam Fractionation technology. Compared to those without β-cyclodextrin, activity recovery and specific activity obtained satisfactory relative increases of 34.1% and 110.7%, respectively.
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Isolation of soy whey proteins from isoflavones in the concentrated solution using Foam Fractionation
Separation and Purification Technology, 2015Co-Authors: Wei Liu, Yanji Wang, Di HuangAbstract:Abstract The isolation of whey soy proteins (WSP) from isoflavones in the concentrated solution using Foam Fractionation was studied, where the concentrated solution was the Foamate of Foam Fractionation. It has been indicated that isoflavones existed in the form of complex with WSP in the Foamate. The result of batch dissociation experiments showed that isoflavones were dissociated from WSP through adjusting temperature and pH. Foam Fractionation was performed by using the Foamate as the feeding solution under the conditions of temperature 50 °C, pH 10.0, volumetric air flow rate 40 mL/min and loading liquid height 400 mm. The enrichment ratio and the recovery percentage of WSP reached 9.24 and 89.43%, respectively. The retention percentage of isoflavones in the residual solution was 90.02%. A two-stage batch Foam Fractionation was developed for successively achieving the enrichment of isoflavones from the soy whey wastewater using WSP as the collectors and the isolation of WSP from isoflavones.
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Protein aggregation in Foam Fractionation of bovine serum albumin: Effect of protein concentration
Biochemical Engineering Journal, 2015Co-Authors: Yanji Wang, Yanyan WangAbstract:Abstract In Foam Fractionation of proteins, a clear understanding of their aggregation induced by the gas-liquid interface has great importance to reducing the loss of their bioactivity. In this work, the effects of the concentration of bovine serum albumin (BSA) on its aggregation induced by the gas-liquid interface were investigated at the molecular level to clearly explain how this protein aggregated in Foam Fractionation. The results show that reducing the BSA concentration made the protein structure more unfolded so that it enhanced the protein aggregation induced by the gas-liquid interface. In Foam Fractionation, the BSA aggregates were mainly formed in the desorption of the BSA molecules from the gas-liquid interface. Their formation was closely related to the BSA enrichment ratio. In the concentration from 0.05 g/L to 0.20 g/L, the highly unfolded BSA structure and the high enrichment jointly resulted in the formation of insoluble aggregates.
Peter Martin - One of the best experts on this subject based on the ideXlab platform.
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Competitive adsorption of surfactant–protein mixtures in a continuous stripping mode Foam Fractionation column
Chemical Engineering Science, 2016Co-Authors: Ishara Kamalanathan, Peter MartinAbstract:Abstract In this paper a detailed experimental study on the application of continuous stripping mode Foam Fractionation to separate a model surfactant–protein mixture was performed with emphasis on the competitive adsorption behaviour and transport processes of surfactant–protein mixtures in the rising Foam column. Bubble size measurements of the Foamate showed that at steady state conditions the bubbles rising from the liquid pool were stabilised by BSA. However at the top of the column the recovery of Triton X−100 in the Foamate (75–100%) was always greater than the recovery of BSA (13–76%) for all Foam Fractionation experiments. The enrichment of BSA remained at almost unity for experiments with high feed concentrations of both components and low air flow rates, and only increased when the recovery of Triton X−100 reached 100%. Thus it was concluded that Triton X–100 displaced the adsorbed BSA from the surface. The surface activity and diffusivity of the two components was determined from surface tension and nuclear magnetic resonance (NMR) measurements. These results illustrated that competitive adsorption behaviour was due to the greater maximum surface pressure (2.05 times) and diffusivity (19.6 times) of Triton X−100 than BSA. In addition to investigating the effect of Foam Fractionation process parameters on the separation of mixed systems, the results from the characterisation studies of surface adsorption and Foam properties provided insight and deeper understanding of the competitive adsorption behaviour of surfactants and proteins in a Foam Fractionation process.
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Foam Fractionation with reflux
Chemical Engineering Science, 2010Co-Authors: Peter Martin, James Winterburn, H.m. Dutton, Stefanie L. Baker, A B RussellAbstract:Abstract This paper shows that the Foam drainage characterisation of Stevenson (2006a) provides a useful basis for the modelling of Foam Fractionation systems with and without reflux following the conceptual approach first proposed by Lemlich (1968a) . Furthermore, the paper shows that surfactant transport between the rising and falling streams during Foam Fractionation with reflux can be characterised by a simple mass transfer coefficient. A set of non-dimensionalized process parameters is proposed and, using these, it is shown that this approach enables the whole operating regime of a Foam Fractionation device to be mapped out from a small number of relatively simple experiments to measure the surfactant adsorption isotherm, Foam drainage characteristics, bubble size and mass transfer coefficient. The validity of this approach was demonstrated experimentally for a Foam Fractionation system continuously separating cetylpyridinium chloride (CPC) from a solution of constant concentration under total reflux. The dimensionless mass transfer group appeared to be invariant for this system, with a mean value of 3.7, over the studied range of rising gas to liquid flux ratio. It was shown for this case that the operation could be summarised in a small number of simple heuristic rules which gave valuable insight into the design and operation of this Foam Fractionation system.
Nan Hu - One of the best experts on this subject based on the ideXlab platform.
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removal of pyridine from its wastewater by using a novel Foam Fractionation column
Chemical Engineering Journal, 2017Co-Authors: Di Huang, Yanrui Chen, Zhaoliang Wu, Nan HuAbstract:Abstract Many of pyridine compounds are considered as typical hazardous refractory organics due to their acute toxic properties and teratogenic effects. Therefore, it is great significant to develop a separation technology with the characters of low energy consumption and environmental compatibility to efficiently remove pyridine from its wastewater. In this work, Foam Fractionation was used to remove pyridine from its wastewater and a novel Foam Fractionation column was designed for enhancing interfacial adsorption by vertical sieve tray and strengthening Foam drainage by floating tongue type tray, in which bubble diameter was monitored for adjusting feeding flow rate and air flow rate in the continuous Foam Fractionation process. By comparing the Foam properties and the adsorption properties of three anionic surfactants (sodium dodecyl sulfate, sodium alcohol ether sulfate and sodium alpha-olefin sulfonate), sodium dodecyl sulfate was chosen as the optimal collector to remove pyridine at pH 4.5. Under the optimal operating conditions, the enrichment ratio and removal percentage of pyridine could reach as high as 34.5 and 90.2%, simultaneously. Above results indicated that Foam Fractionation was a practicable technology to efficiently remove a hazardous material from its wastewater by designing an effective Foam Fractionation column.
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recovery of yam mucilage from the yam starch processing wastewater by using a novel Foam Fractionation column
Separation and Purification Technology, 2016Co-Authors: Hongzhen Li, Zhiqiang Li, Nan Hu, Zhaoliang Wu, Di HuangAbstract:Abstract It is difficult to separate a surface-active material from a wastewater with a high viscosity by Foam Fractionation. In order to solve the problem, a novel Foam Fractionation column with vertical sieve tray (VST) placed in the Foam phase was developed for effectively recovering yam mucilage from the viscous yam starch processing wastewater. The effects of design parameters of VST on its Foam drainage properties were investigated. The results showed that the suitable design parameters of VST were the number of trays in VST 5, the number of vertical sieve caps in each tray 4 and the number of sieve pores in each cap 28. Meanwhile, the suitable operating conditions were also determined. Under the conditions of pH 6.0, temperature 25 °C, volumetric air flow rate 50 mL/min and loading liquid volume 500 mL, the enrichment ratio and recovery percentage of yam mucilage were 5.70 and 91.21%, respectively, which were 3.77 and 1.55 times higher than those in the control column. The above results indicated that the novel Foam Fractionation column with VST in the Foam phase could simultaneously improve the enrichment ratio and the recovery percentage of yam mucilage by strengthening Foam drainage. This work was aimed at developing a novel Foam Fractionation column for effectively recovering a valuable byproduct from a viscous food processing wastewater and further facilitating the industrial application of Foam Fractionation in food industry.