Xiangrong Chen

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (28)98.32 Total impact

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    ABSTRACT: β-Poly(malic acid) (PMLA) has attracted increasing attentions because of its potential application in medicine and other industries. In this study, the variation of PMLA molecular weight (Mw) in the batch culture and the strategies to enhance PMLA Mw were studied. Adding exogenous Ca(2+) (0.1g/L CaCl2) to the medium caused a significant increase in both PMLA concentration and Mw (11.38% and 26.3%, respectively) when Na2CO3 was used as the neutralizer. The Mw of PMLA during the process of batch culture, which associated with the specific PMLA production per unit cell mass (Yp/x) before glucose was depleted, increased from 12.522KDa to its maximum 18.693KDa and then kept decreasing until the end of the culture. Compared with the results in batch culture, Mw increased by 84.4% (up to 19.51kDa) with a productivity of 1.1 g·h(-1)·L(-1) when the cells were maintained in exponential growth phase during Ca(2+) added repeated batch culture. The present work provides an efficient approach to obtain superior quality PMLA product with high Mw.
    No preview · Article · Dec 2015 · International journal of biological macromolecules
  • Xiaojie Zhuang · Xiangrong Chen · Yi Su · Jianquan luo · Weifeng Cao · Yinhua Wan
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    ABSTRACT: Abstract In order to improve the separation performance of pervaporation (PV) membranes, different silicalite-1 particles were prepared by hydrothermal synthesis in fluoride (F) or alkaline (OH) media respectively, and then incorporated into polydimethysiloxane (PDMS) to prepare PDMS/silicalite-1 PV membranes. These silicalite-1 particles were characterized by SEM, FT-IR, NMR, XRD, BET and IGA. The results indicated that, compared with the silicalite-1(OH), the silicalite-1(F) particles had much less silanol groups and were more hydrophobic, thus showing higher selectivity to ethanol. Accordingly, the separation factor (ethanol/water) of the PDMS/silicalite-1(F) membrane was much higher than that of PDMS/silicalite-1(OH) membrane at the same silicalite-1 loading. For the PDMS/silicalite-1(OH) membrane, the highest separation factor (23.0) was obtained at 60 wt% silicalite-1 loading, while it was found to be 23.8 at 40 wt% silicalite-1 loading for the PDMS/silicalite-1(F) membrane. However, due to the larger size of the silicalite-1(F) particles, its maximal loading (40 wt%) in PDMS was lower than that of the silicalite-1(OH) particles (60 wt%). In order to take advantage of the higher selectivity of silicalite-1(F) particles and the higher loading of silicalite-1(OH), these two kinds of silicalite-1 particles were mixed and incorporated into PDMS. Using this new strategy, the total loading of the silicalite-1 particles could be up to 60 wt%, and the separation factor of such membrane increased to 28.9 when the partial loading of silicalite-1(F) was 30 wt%. The effects of feed temperature and ethanol concentration on this new PDMS/silicalite-1(F)-silicalite-1(OH) membrane were also investigated. The results demonstrated that the incorporation of the mixed silicalite-1(F) and silicalite-1(OH) particles into PDMS could be a promising method for the preparation of high performance PV membranes.
    No preview · Article · Nov 2015 · Journal of Membrane Science
  • Lixia Liu · Fei Shen · Xiangrong Chen · Jianquan Luo · Yi Su · Huanhuan Wu · Yinhua Wan
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    ABSTRACT: Surface hydrophobic modifications of hydrophilic porous polyacrylonitrile (PAN) membranes for vacuum membrane distillation (VMD) desalination via dipping in fluorine-containing solution followed by plasma irradiation were studied. 1H, 1H, 2H, 2H-perfluorodecyl methacrylate (F8) was used as the monomer. The monomer was not vaporized in this work, which might make the modification process more economic and environment friendly. The surface hydrophobicity, morphology and VMD performance of the modified membranes were controlled by degree of grafting (DG), and a moderate DG value of 43.54μgcm-2 was optimal. Before grafting F8, Ar plasma etching pretreatment of the pristine PAN membrane was also studied, which increased the membrane's surface pore size, roughness, thus improving the VMD performance and stability of the finally modified membrane (PAN-EM). When a 3.5wt% NaCl solution was treated by the PAN-EM membrane at 80°C under vacuum degree of 95.2 kPa, a flux of 59.42 kgm-2h-1 and a salt rejection of 99.93% were achieved. Moreover, the PAN-EM membrane showed a stable desalination performance during an 80h intermittent VMD operation, indicating that the strategy consisting of etching, dipping and grafting developed in this study was very promising to fabricate porous and hydrophobic membranes with great application prospect for VMD desalination.
    No preview · Article · Nov 2015 · Journal of Membrane Science
  • Jinxin Fan · Jianquan Luo · Weijie Song · Xiangrong Chen · Yinhua Wan
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    ABSTRACT: Abstract The surging demand for plasma proteins, mainly driven by the growing market and the development of new therapeutic indications, is promoting manufacturers to improve the throughput of plasma proteins. Due to the inherent convective mass transfer, membrane chromatography has been proved to be an efficient approach for extracting a small amount of target proteins from large-volume feed. In this study, α1-antitrypsin (AAT) was extracted from human plasma fraction IV by a two-step membrane chromatography. An anion-exchange membrane chromatography (AEMC) was used to capture the plasma proteins in bind/elute mode, and the obtained effluent was further polished by a hydrophobic interaction membrane chromatography (HIMC) in flow-through mode. Under optimal conditions, the recovery and purity of AAT achieved 87.0% and 0.58 AAT/protein (g/g) by AEMC, respectively. After the precise polishing by HIMC, the purity of AAT was 1.22 AAT/protein (g/g). The comparison results showed that membrane chromatography outperformed column chromatography in both steps because of its high throughput. This two-step membrane chromatography could obtain an AAT recovery of 83.3% and an activity recovery of 91.4%. The outcome of this work not only offers an alternative process for protein purification from plasma, but also provides guidelines for manufacturing product from a large-volume feed with multi-components by membrane chromatography.
    No preview · Article · Oct 2015 · Journal of Chromatography A
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    ABSTRACT: Abstract The objective of this work was to study the effect of silane coupling agent on the performance of mixed matrix membranes (MMMs) and to develop a mathematical model to analyze the performance of the MMMs. The silicalite-1 modified by various alkoxysilanes was incorporated into polydimethysiloxane (PDMS) to prepare dense MMMs. The modified silicalite-1 and corresponding MMMs were characterized by FT-IR, CA, TGA, DSC and SEM. These results confirmed that the silicalite-1 was successfully modified by various alkoxysilanes. The effects of alkoxysilane chain length and chemical structure on the pervaporation (PV) performance of MMMs were discussed in detail. All the silane modification did not change the framework of silicalite-1. Better dispersion of silicalite-1 in PDMS was attained after modification and all the modified membranes could eliminate the nonselective voids inside the membranes. Moreover, the silane coupling agent had a contradictory effect on the PV performance of the membranes. On the one hand, the silane coupling agent improved the compatibility between silicalite-1 and PDMS. On the other hand, the silane coupling agent introduced a silane phase around the silicalite-1, which depressed the selectivity of the pristine silicalite-1. Silicalite-1 grafted with vinyl group showed the best compatibility with PDMS, and the resulting MMMs had the highest separation factor to ethanol because strong chemical bonds between vinyl-silicalite-1 and PDMS were formed with the thinnest silane film. For the separation of ethanol from a dilute solution, a separation factor of 34.3 was obtained with the vinyl-MMMs, which was 49% higher than that of unmodified membrane. As the silicalite-1 content increased, the separation factor increased. Furthermore, a mathematical model was proposed to predict the performance of MMMs. And both the permeability and selectivity obtained by the proposed model were in good agreement with the experiment data.
    No preview · Article · Oct 2015 · Journal of Membrane Science
  • Xiangrong Chen · Jianquan Luo · Benkun Qi · Weifeng Cao · Yinhua Wan
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    ABSTRACT: Polyethylene oxide (PEO)-modified ultrafiltration (UF) membranes were prepared using polyacrylonitrile-graft-polyethylene oxide (PAN-g-PEO) copolymers through immersion precipitation phase inversion method. Compared to PAN membrane, the PEO-modified UF membranes possessed extraordinary hydrophilic surface owing to the enrichment of PEO segments, which was confirmed by X-ray photoelectronic spectroscopy (XPS). The effects of membrane hydrophilicity on the organic fouling resistance were investigated by means of the resistance-in-series model. The results showed that the hydrophilic modification of UF membrane contributed to the fouling control in bovine serum albumin (BSA) and Escherichia coli (E. coli) bacteria filtration. The antifouling ability of the membranes increased with increasing PEO content. The pure water flux could recover completely after filtering BSA and bacteria, respectively, for the membranes with 25.2% and 8.5% PEO content. In contract, the increase of membrane hydrophilicity had a negative effect on the humic acid (HA) and sodium alginate (SA) filtration. The membrane permeability of the PAN membrane unexpectedly increased after HA or SA filtration, while the flux recovery ratio of PEO-modified membranes decreased with increasing PEO content. The differences in fouling behavior of the various organic foulants on hydrophobic or hydrophilic membrane were attributed to the nature of organic foulants and their interaction with membranes.
    No preview · Article · Sep 2015 · Journal of Water Process Engineering
  • Zhiwei Chen · Jianquan Luo · Xiangrong Chen · Xiaofeng Hang · Fei Shen · Yinhua Wan
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    ABSTRACT: Abstract A novel integrated isoelectric precipitation-nanofiltration (NF)-anaerobic fermentation process was proposed for fully recycling model dairy wastewater (MDW). Isoelectric precipitation at pH 4.80 and subsequent centrifugation could remove most proteins. Acetic and butyric acids from anaerobic fermentation were available for acidic precipitation, and the performance was comparable to that of hydrochloric acid. The pretreatment of MDW by precipitation could greatly retard NF membrane fouling, especially at pH 7.09 owing to the electrostatic repulsion between solutes and membrane. NF270 membrane was preferred for MDW concentration due to its high antifouling performance, high permeability and acceptable permeate quality. Anaerobic fermentation fed with model NF retentate without caseins produced higher proportion of acetate, butyrate and hydrogen, and this effluent with shorter-chain volatile fatty acids (VFAs) and lower pH was more suitable for casein precipitation in dairy wastewater.
    No preview · Article · Aug 2015 · The Chemical Engineering Journal
  • Xiaofeng Hang · Xiangrong Chen · Jianquan Luo · Weifeng Cao · Yinhua Wan
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    ABSTRACT: Perfluorooctanoate (PFOA) is a persistent chemical that has been detected globally in the natural aquatic environment, while the waste discharge of fluoropolymer industry is one of the major sources of PFOA pollution. In this study, the removal and recovery of PFOA by nanofiltration (NF) were investigated with ammonium perfluorooctanoate model solutions under a wide range of PFOA concentrations. Performances of two commercially available NF membranes, namely NF270, NF90, were evaluated. The results show that the NF90 membrane offered a higher PFOA rejection (almost 100% at a PFOA concentration below 800 mg L−1). Using NF90 membrane, a model solution with a higher initial PFOA concentration of 1000 mg L−1 was used to further test the membrane performance. Both stable osmotic pressure at membrane surface and high PFOA rejection (99.3%) were obtained when the PFOA concentration was larger than a certain value due to the formation of micelles. Furthermore, membrane operation parameters (i.e. stirring speed, pH, temperature, and permeate flux) on the TMP and the PFOA concentration in permeate were investigated under a much higher initial PFOA concentration (10,000 mg L−1). The experimental results clearly confirm that recovery of highly concentrated PFOA of more than 117073.7 mg L−1 could be achieved by one-step NF treatment, while the permeate could be further treated by multi-stage NF to fully recover the PFOA. It was also found that the permeability of membrane could be recovered completely by simple water rinse, suggesting that NF is highly applicable for recovery of PFOA from wastewater in fluoropolymer production.
    No preview · Article · May 2015 · Separation and Purification Technology
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    ABSTRACT: Recovery of water and soluble substances from soybean soaking water (SSW) was carried out using an integrated membrane system consisting of ultrafiltration (UF) and reverse osmosis (RO). It was found that even using the four-stage UF-UF-RO-RO process with pH adjustment, the quality of RO permeate did not satisfy the emission standard, while the RO permeate from the two-stage UF-RO treatment could be reused for soybean soaking. The chemical oxygen demand (COD) of RO permeate from this process was 1700-2800 mg/L including acetic acid, γ-aminobutyric acid, lactic acid, alcohol, and other unidentified soybean extract with -C═O or -N-H groups, which had negligible effect on the subsequent soybean soaking. The RO permeate was reused for five cycles with addition of tap water (RO permeate/tap water = 1:1.5), and the soaked soybeans were used for Koji making, which showed the similar properties with Koji made from soybeans soaked by tap water. Furthermore, the concentrates in the integrated UF-RO system provided a raw material for culturing algae or preparing animal feed. This work demonstrated that through UF-RO treatment, the wastewater pollution from food industry could be eliminated by resource recovery and utilization.
    No preview · Article · May 2015 · Food and Bioprocess Technology
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    Jing Li · Xiangrong Chen · Benkun Qi · Jianquan Luo · Yuming Zhang · Yi Su · Yinhua Wan
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    ABSTRACT: Production of acetone–butanol–ethanol (ABE) from cassava was investigated with a fermentation–pervaporation (PV) coupled process. ABE products were in situ removed from fermentation broth to alleviate the toxicity of solvent to the Clostridium acetobutylicum DP217. Compared to the batch fermentation without PV, glucose consumption rate and solvent productivity increased by 15% and 21%, respectively, in batch fermentation–PV coupled process, while in continuous fermentation–PV coupled process running for 304 h, the substrate consumption rate, solvent productivity and yield increased by 58%, 81% and 15%, reaching 2.02 g/L h, 0.76 g/L h and 0.38 g/g, respectively. Silicalite-1 filled polydimethylsiloxane (PDMS)/polyacrylonitrile (PAN) membrane modules ensured media recycle without significant fouling, steadily generating a highly concentrated ABE solution containing 201.8 g/L ABE with 122.4 g/L butanol. After phase separation, a final product containing 574.3 g/L ABE with 501.1 g/L butanol was obtained. Therefore, the fermentation–PV coupled process has the potential to decrease the cost in ABE production.
    Full-text · Article · Oct 2014 · Bioresource Technology
  • Yinhua Wan · Yuming Zhang · Xiangrong Chen · Benkun Qi · Yi Su

    No preview · Article · Jul 2014 · New Biotechnology
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    Benkun Qi · Xiangrong Chen · Su Yi · Yinhua Wan
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    ABSTRACT: Simultaneous saccharification and fermentation has been regarded as a promising process for bioconversion of lignocellulosic biomass to acetone-butanol-ethanol (ABE); however, there exits potential inhibition of cellulase, β-glucosidase, and xylanase by the fermentation product(s) due to the combination of enzymatic hydrolysis and microbial fermentation in one vessel. The effects of ABE fermentation products including acetone, butanol, ethanol, acetic acid, and butyric acid, individually and in a combination, on the cellulase, β-glucosidase, and xylanase activities and enzymatic saccharification of dilute acid pretreated wheat straw (WS) were studied. The experimental results showed that butanol and mixture of inhibitor compounds strongly depressed cellulolytic and hemicellulolytic activities, and no synergistic inhibiting effect between inhibitors on enzyme activities was observed. Saccharification of pretreated WS was mainly affected by butanol and temperature. Moreover, preincubation of enzyme solutions with inhibitors mixture for 72 h decreased cellulase and xylanase activities by 15–25% at the three temperatures examined (30, 37, and 50°C), and a significant decrease (64%) in β-glucosidase activity was found at 50°C. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 497–503, 2014
    Full-text · Article · Jul 2014 · Environmental Progress & Sustainable Energy
  • Xiangrong Chen · Yijie Luo · Benkun Qi · Yinhua Wan
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    ABSTRACT: Simultaneous extraction of oil and soy isoflavones from soy sauce residue (SSR) was investigated by means of the two-phase solvent extraction intensified by ultrasonication. A single factor test was first carried out to study the effects of ultrasonic time, ethanol concentration, ratio of ethanol/water phase to raw material, ratio of hexane phase to raw material, and ultrasonic power on the extraction rates of oil and isoflavones, then response surface methodology was applied to further optimize and simulate four key factors. The results showed that the extraction rates of oil and isoflavones of 92.07% and 92.53%, respectively, could be obtained when ethanol concentration was 74.88%, ratio of ethanol/water phase to raw material 15:1, ratio of hexane phase to raw material 8.64:1, extraction time 20 min, and ultrasonic power 160 W. The predictive rates were well matched with the experimental ones. The quality analysis of oil and soy isoflavones from SSR showed that the extracted oil with high acid value could be a potential raw material for biodiesel production instead of cooking. The extracted soy isoflavones existed mainly in aglycones form, which might afford higher bioactivity than that from the other soybean products.
    No preview · Article · May 2014 · Separation and Purification Technology
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    ABSTRACT: Bacillus coagulans IPE22 was used to produce lactic acid (LA) from mixed sugar and wheat straw hydrolysates, respectively. All fermentations were conducted under non-sterilized conditions and sodium hydroxide was used as neutralizing agent to avoid the production of insoluble CaSO4. In order to eliminate the sequential utilization of mixed sugar and feedback inhibition during batch fermentation, membrane integrated repeated batch fermentation (MIRB) was used to improve LA productivity. With MIRB, a high cell density was obtained and the simultaneous fermentation of glucose, xylose and arabinose was successfully realized. The separation of LA from broth by membrane in batch fermentation also decreased feedback inhibition. MIRB was carried out using wheat straw hydrolysates (29.72g/L glucose, 24.69g/L xylose and 5.14g/L arabinose) as carbon source, LA productivity was increased significantly from 1.01g/L/h (batch 1) to 2.35g/L/h (batch 6) by the repeated batch fermentation.
    Full-text · Article · Apr 2014 · Bioresource Technology
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    Yuming Zhang · Xiangrong Chen · Jianquan Luo · Benkun Qi · Yinhua Wan
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    ABSTRACT: A thermophilic lactic acid (LA) producer was isolated and identified as Bacillus coagulans strain IPE22. The strain showed remarkable capability to ferment pentose, hexose and cellobiose, and was also resistant to inhibitors from lignocellulosic hydrolysates. Based on the strain's promising features, an efficient process was developed to produce LA from wheat straw. The process consisted of biomass pretreatment by dilute sulfuric acid and subsequent SSCF (simultaneous saccharification and co-fermentation), while the operations of solid-liquid separation and detoxification were avoided. Using this process, 46.12g LA could be produced from 100g dry wheat straw with a supplement of 10g/L corn steep liquid powder at the cellulase loading of 20FPU (filter paper activity units)/g cellulose. The process by B. coagulans IPE22 provides an economical route to produce LA from lignocellulose.
    Full-text · Article · Mar 2014 · Bioresource Technology
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    Jing Li · Xiangrong Chen · Benkun Qi · Jianquan Luo · Xiaojie Zhuang · Yi Su · Yinhua Wan
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    ABSTRACT: The pervaporation (PV) performance of a thin-film silicalite-1 filled PDMS/PAN composite membrane was investigated in the continuous acetone–butanol–ethanol (ABE) production by a fermentation–PV coupled process. Results showed that continuous removal of ABE from the broth at three different dilution rates greatly increased both the solvent productivity and the glucose utilization rate, in comparison to the control batch fermentation. The high solvent productivity reduced the acid accumulation in the broths because most acids were reassimilated by cells for ABE production. Therefore, a higher total solvent yield of 0.37 g/g was obtained in the fermentation–PV coupled process, with a highly concentrated condensate containing 89.11–160.00 g/L ABE. During 268 h of the fermentation–PV coupled process, the PV membrane showed a high ABE separation factor of more than 30 and a total flux of 486–710 g/m2h. Membrane fouling was negligible for the three different dilution rates. The solution-diffusion model, especially the mass transfer equation, was proved to be applicable to this coupled process.
    Full-text · Article · Jan 2014 · Energy & Fuels
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    ABSTRACT: Bacillus coagulans IPE22 was used to produce lactic acid (LA) from mixed sugar and wheat straw hydrolysates, respectively. All fermentations were conducted under non-sterilized conditions and sodium hydroxide was used as neutralizing agent to avoid the production of insoluble CaSO4. In order to eliminate the sequential utilization of mixed sugar and feedback inhibition during batch fermentation, membrane integrated repeated batch fermentation (MIRB) was used to improve LA productivity. With MIRB, a high cell density was obtained and the simultaneous fermentation of glucose, xylose and arabinose was successfully realized. The separation of LA from broth by membrane in batch fermentation also decreased feedback inhibition. MIRB was carried out using wheat straw hydrolysates (29.72 g/L glucose, 24.69 g/L xylose and 5.14 g/L arabinose) as carbon source, LA productivity was increased significantly from 1.01 g/L/h (batch 1) to 2.35 g/L/h (batch 6) by the repeated batch fermentation.
    Full-text · Article · Jan 2014 · Bioresource Technology
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    Jianquan Luo · Shaoping Wei · Yi Su · Xiangrong Chen · Yinhua Wan
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    ABSTRACT: The desalination of model solutions containing iminodiacetic acid (IDA) and NaCl was examined using three commercial nanofiltration (NF) membranes (NF270, Desal-5 DL, Nanomax50). Experimental results showed that with all the three membranes, the rejection of IDA increased with the increase of pH from 8 to 11, and negative rejection of Cl− was found in filtration in a certain range of pH. NF270 was chosen to further investigate the effect of permeate flux, temperature and solutes concentration on the separation of IDA and NaCl. The results showed that IDA rejection decreased with the increase of temperature and salt concentration, and the high concentration of IDA could induce a lower rejection of NaCl. Furthermore, the desalination and recovery were examined with model solution in different operation modes and a laboratory scale test with an industrial fluid was also performed. Under suitable conditions, with NF270, the recovery of IDA could be more than 95% while the NaCl removal was greater than 58%.
    Full-text · Article · Apr 2013 · Journal of Membrane Science
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    Jianquan Luo · Luhui Ding · Xiangrong Chen · Yinhua Wan
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    ABSTRACT: Soy sauce is a traditional Chinese food condiment, normally containing a high concentration of sodium chloride (NaCl, 18–20%, w/v). To meet people's demand for healthy foods, part of NaCl needs to be removed from the raw soy sauce. In this study, nanofiltration was employed for the removal of salt and the recovery of nutritional components such as amino acid and fragrance from raw soy sauce, using four commercial NF membranes (NF270, NF-, NF90, Desal-5 DL). NF270 was found to be most suitable for the purpose. It was used to further study the effect of operation modes on desalination performance. The combination mode that concentration of the diluted soy sauce to its original volume, followed by diafiltration, was found to be most suitable one in terms of amino nitrogen (AN) and NaCl rejection, water consumption and operating pressure. Moreover, it was found that the rejection of AN was constant under the experimental conditions examined while NaCl rejection showed a linear relation with the concentration ratio of AN to NaCl. Based on mass balance and rejection equations, mathematical models were developed for predicting the concentration of solutes in retentate during desalination process, the simulation results agreed well with the experimental data.
    Full-text · Article · Apr 2013 · Separation and Purification Technology
  • Xiangrong Chen · Yi Su · Fei Shen · Yinhua Wan
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    ABSTRACT: Antifouling ultrafiltration membranes were prepared by polyacrylonitrile-block-polyethylene glycol (PAN-b-PEG) copolymers through immersion precipitation phase inversion method. The effect of copolymer composition and PEG chain length on the structure and property of the block copolymer membranes were investigated. Compared with PAN membranes, PAN-b-PEG copolymer membranes possessed excellent hydrophilic surface due to the enrichment of PEG segments, which was confirmed by X-ray photoelectronic spectroscopy (XPS) and contact angle measurements. SEM images showed these PAN-b-PEG copolymer membranes had a typical asymmetric structure similar with PAN membranes, but the thinner skin layer was helpful for the membrane resistance reduction. The PAN-b-PEG copolymer membranes exhibited better antifouling ability for BSA than PAN membranes. The BSA absorption amount on the copolymer membrane could reduce 45% than that on the PAN membrane, and its irreversible fouling extent could lower 7 times. The hydrophilicity and antifouling ability of the copolymer membranes increased with increasing PEG content in the copolymer. While the chain length of PEG had little effect on the hydrophilicity and antifouling ability of the copolymer membrane.
    No preview · Article · Nov 2011 · Fuel and Energy Abstracts