The Experts below are selected from a list of 50373 Experts worldwide ranked by ideXlab platform
Shangtian Yang - One of the best experts on this subject based on the ideXlab platform.
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a carbon nanotube filled polydimethylsiloxane hybrid membrane for enhanced Butanol recovery
Scientific Reports, 2015Co-Authors: Jiangang Ren, Shangtian Yang, Jianxin SunAbstract:The carbon nanotubes (CNTs) filled polydimethylsiloxane (PDMS) hybrid membrane was fabricated to evaluate its potential for Butanol recovery from acetone-Butanol-ethanol (ABE) fermentation broth. Compared with the homogeneous PDMS membrane, the CNTs filled into the PDMS membrane were beneficial for the improvement of Butanol recovery in Butanol flux and separation factor. The CNTs acting as sorption-active sites with super hydrophobicity could give an alternative route for mass transport through the inner tubes or along the smooth surface. The maximum total flux and Butanol separation factor reached up to 244.3 g/m2·h and 32.9, respectively, when the PDMS membrane filled with 10 wt% CNTs was used to separate Butanol from the Butanol/water solution at 80°C. In addition, the Butanol flux and separation factor increased dramatically as temperature increased from 30°C to 80°C in feed solution since the higher temperature produced more free volumes in polymer chains to facilitate Butanol permeation. A similar increase was also observed when Butanol titer in solution increased from 10 g/L to 25 g/L. Overall, the CNTs/PDMS hybrid membrane with higher Butanol flux and selectivity should have good potential for pervaporation separation of Butanol from ABE fermentation broth.
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two stage in situ gas stripping for enhanced Butanol fermentation and energy saving product recovery
Bioresource Technology, 2013Co-Authors: Jingbo Zhao, Fangfang Liu, Shangtian YangAbstract:Abstract Two-stage gas stripping for Butanol recovery from acetone-Butanol-ethanol (ABE) fermentation with Clostridium acetobutylicum JB200 in a fibrous bed bioreactor was studied. Compared to fermentation without in situ gas stripping, more ABE (10.0 g/L acetone, 19.2 g/L Butanol, 1.7 g/L ethanol vs. 7.9 g/L acetone, 16.2 g/L Butanol, 1.4 g/L ethanol) were produced, with a higher Butanol yield (0.25 g/g vs. 0.20 g/g) and productivity (0.40 g/L·h vs. 0.30 g/L·h) due to reduced Butanol inhibition. The first-stage gas stripping produced a condensate containing 175.6 g/L Butanol (227.0 g/L ABE), which after phase separation formed an organic phase containing 612.3 g/L Butanol (660.7 g/L ABE) and an aqueous phase containing 101.3 g/L Butanol (153.2 g/L ABE). After second-stage gas stripping, a highly concentrated product containing 420.3 g/L Butanol (532.3 g/L ABE) was obtained. The process is thus effective in producing high-titer Butanol that can be purified with much less energy.
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fed batch fermentation for n Butanol production from cassava bagasse hydrolysate in a fibrous bed bioreactor with continuous gas stripping
Bioresource Technology, 2012Co-Authors: Congcong Lu, Jingbo Zhao, Shangtian YangAbstract:Concentrated cassava bagasse hydrolysate (CBH) containing 584.4 g/L glucose was studied for acetone–Butanol–ethanol (ABE) fermentation with a hyper-Butanol-producing Clostridium acetobutylicum strain in a fibrous bed bioreactor with gas stripping for continuous Butanol recovery. With periodical nutrient supplementation, stable production of n-Butanol from glucose in the CBH was maintained in the fed-batch fermentation over 263 h with an average sugar consumption rate of 1.28 g/L h and Butanol productivity of 0.32 ± 0.03 g/L h. A total of 108.5 g/L ABE (Butanol: 76.4 g/L, acetone: 27.0 g/L, ethanol: 5.1 g/L) was produced, with an overall yield of 0.32 ± 0.03 g/g glucose for ABE and 0.23 ± 0.01 g/g glucose for Butanol. The gas stripping process generated a product containing 10–16% (w/v) of Butanol, ∼4% (w/v) of acetone, a small amount of ethanol (<0.8%) and almost no acids, resulting in a highly concentrated Butanol solution of ∼64% (w/v) after phase separation.
Fengwu Bai - One of the best experts on this subject based on the ideXlab platform.
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a novel close circulating vapor stripping vapor permeation technique for boosting bioButanol production and recovery
Biotechnology for Biofuels, 2018Co-Authors: Chao Zhu, Lijie Chen, Chuang Xue, Fengwu BaiAbstract:Butanol derived from renewable resources by microbial fermentation is considered as one of not only valuable platform chemicals but alternative advanced biofuels. However, due to low Butanol concentration in fermentation broth, Butanol production is restricted by high energy consumption for product recovery. For in situ Butanol recovery techniques, such as gas stripping and pervaporation, the common problem is their low efficiency in harvesting and concentrating Butanol. Therefore, there is a necessity to develop an advanced Butanol recovery technique for cost-effective bioButanol production. A close-circulating vapor stripping-vapor permeation (VSVP) process was developed with temperature-difference control for single-stage Butanol recovery. In the best scenario, the highest Butanol separation factor of 142.7 reported to date could be achieved with commonly used polydimethylsiloxane membrane, when temperatures of feed solution and membrane surroundings were 70 and 0 °C, respectively. Additionally, more ABE (31.2 vs. 17.7 g/L) were produced in the integrated VSVP process, with a higher Butanol yield (0.21 vs. 0.17 g/g) due to the mitigation of Butanol inhibition. The integrated VSVP process generated a highly concentrated permeate containing 212.7 g/L Butanol (339.3 g/L ABE), with the reduced energy consumption of 19.6 kJ/g-Butanol. Therefore, the present study demonstrated a well-designed energy-efficient technique named by vapor stripping-vapor permeation for single-stage Butanol removal. The Butanol separation factor was multiplied by the temperature-difference control strategy which could double Butanol recovery performance. This advanced VSVP process can completely eliminate membrane fouling risk for fermentative Butanol separation, which is superior to other techniques.
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A novel close-circulating vapor stripping-vapor permeation technique for boosting bioButanol production and recovery
'Springer Science and Business Media LLC', 2018Co-Authors: Chao Zhu, Lijie Chen, Chuang Xue, Fengwu BaiAbstract:Abstract Background Butanol derived from renewable resources by microbial fermentation is considered as one of not only valuable platform chemicals but alternative advanced biofuels. However, due to low Butanol concentration in fermentation broth, Butanol production is restricted by high energy consumption for product recovery. For in situ Butanol recovery techniques, such as gas stripping and pervaporation, the common problem is their low efficiency in harvesting and concentrating Butanol. Therefore, there is a necessity to develop an advanced Butanol recovery technique for cost-effective bioButanol production. Results A close-circulating vapor stripping-vapor permeation (VSVP) process was developed with temperature-difference control for single-stage Butanol recovery. In the best scenario, the highest Butanol separation factor of 142.7 reported to date could be achieved with commonly used polydimethylsiloxane membrane, when temperatures of feed solution and membrane surroundings were 70 and 0 °C, respectively. Additionally, more ABE (31.2 vs. 17.7 g/L) were produced in the integrated VSVP process, with a higher Butanol yield (0.21 vs. 0.17 g/g) due to the mitigation of Butanol inhibition. The integrated VSVP process generated a highly concentrated permeate containing 212.7 g/L Butanol (339.3 g/L ABE), with the reduced energy consumption of 19.6 kJ/g-Butanol. Conclusions Therefore, the present study demonstrated a well-designed energy-efficient technique named by vapor stripping-vapor permeation for single-stage Butanol removal. The Butanol separation factor was multiplied by the temperature-difference control strategy which could double Butanol recovery performance. This advanced VSVP process can completely eliminate membrane fouling risk for fermentative Butanol separation, which is superior to other techniques
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evaluation of hydrophobic micro zeolite mixed matrix membrane and integrated with acetone Butanol ethanol fermentation for enhanced Butanol production
Biotechnology for Biofuels, 2015Co-Authors: Chuang Xue, Fengwu Bai, Lijie Chen, Jiangang Ren, Decai YangAbstract:Butanol is regarded as an advanced biofuel that can be derived from renewable biomass. However, the main challenge for microbial Butanol production is low Butanol titer, yield and productivity, leading to intensive energy consumption in product recovery. Various alternative separation technologies such as extraction, adsorption and gas stripping, etc., could be integrated with acetone–Butanol–ethanol (ABE) fermentation with improving Butanol productivity, but their Butanol selectivities are not satisfactory. The membrane-based pervaporation technology is recently attracting increasing attention since it has potentially desirable Butanol selectivity. The performance of the zeolite-mixed polydimethylsiloxane (PDMS) membranes were evaluated to recover Butanol from Butanol/water binary solution as well as fermentation broth in the integrated ABE fermentation system. The separation factor and Butanol titer in permeate of the zeolite-mixed PDMS membrane were up to 33.0 and 334.6 g/L at 80°C, respectively, which increased with increasing zeolite loading weight in the membrane as well as feed temperature. The enhanced Butanol separation factor was attributed to the hydrophobic zeolites with large pore size providing selective routes preferable for Butanol permeation. In fed-batch fermentation incorporated with pervaporation, 54.9 g/L ABE (34.5 g/L Butanol, 17.0 g/L acetone and 3.4 g/L ethanol) were produced from 172.3 g/L glucose. The overall Butanol productivity and yield increased by 16.0 and 11.1%, respectively, which was attributed to the alleviated Butanol inhibition by pervaporation and reassimilation of acids for ABE production. The zeolite-mixed membrane produced a highly concentrated condensate containing 169.6 g/L Butanol or 253.3 g/L ABE, which after phase separation easily gave the final product containing >600 g/L Butanol. Zeolite loading in the PDMS matrix was attributed to improving the pervaporative performance of the membrane, showing great potential to recover Butanol with high purity. Therefore, this zeolite-mixed PDMS membrane had the potential to improve bioButanol production when integrating with ABE fermentation.
Jo Shu Chang - One of the best experts on this subject based on the ideXlab platform.
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bio Butanol production from glycerol with clostridium pasteurianum ch4 the effects of butyrate addition and in situ Butanol removal via membrane distillation
Biotechnology for Biofuels, 2015Co-Authors: Deshun Lin, Weichen Kao, Chiehlun Cheng, Jo Shu Chang, Hongwei Yen, Wenming Chen, Chiehchen HuangAbstract:Background Clostridium pasteurianum CH4 was used to produce Butanol from glycerol. The performance of Butanol fermentation was improved by adding butyrate as the precursor to trigger the metabolic pathway toward Butanol production, and by combining this with in situ Butanol removal via vacuum membrane distillation (VMD) to avoid the product inhibition arising from a high Butanol concentration.
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enhancing Butanol production with clostridium pasteurianum ch4 using sequential glucose glycerol addition and simultaneous dual substrate cultivation strategies
Bioresource Technology, 2013Co-Authors: Weichen Kao, Deshun Lin, Chiehlun Cheng, Boryann Chen, Chiuyue Lin, Jo Shu ChangAbstract:Adding butyrate significantly enhanced Butanol production from glycerol with Clostridium pasteurianum CH4, which predominantly produces butyrate (instead of Butanol) when grown on glucose. Hence, the butyrate produced from assimilating glucose can be used to stimulate Butanol production from glycerol under dual-substrate cultivation with glucose and glycerol. This proposed Butanol production process was conducted by employing sequential or simultaneous addition of the two substrates. The latter approach exhibited better carbon source utilization and Butanol production efficiencies. Under the optimal glucose to glycerol ratio (20 g L(-1) to 60 g L(-1)), the simultaneous dual-substrate strategy obtained maximum Butanol titer, productivity and yield of 13.3 g L(-1), 0.28 g L(-1) h(-1), and 0.38 mol Butanol/mol glycerol, respectively. Moreover, bagasse and crude glycerol as dual-substrates were also converted into Butanol efficiently with a maximum Butanol concentration, productivity and yield of 11.8 g L(-1), 0.14 g L(-1) h(-1), and 0.33 mol Butanol/mol glycerol, respectively.
Jingbo Zhao - One of the best experts on this subject based on the ideXlab platform.
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a novel in situ gas stripping pervaporation process integrated with acetone Butanol ethanol fermentation for hyper n Butanol production
Biotechnology and Bioengineering, 2016Co-Authors: Fangfang Liu, Jingbo Zhao, Lijie Che, Shangtia YangAbstract:: Butanol is considered as an advanced biofuel, the development of which is restricted by the intensive energy consumption of product recovery. A novel two-stage gas stripping-pervaporation process integrated with acetone-Butanol-ethanol (ABE) fermentation was developed for Butanol recovery, with gas stripping as the first-stage and pervaporation as the second-stage using the carbon nanotubes (CNTs) filled polydimethylsiloxane (PDMS) mixed matrix membrane (MMM). Compared to batch fermentation without Butanol recovery, more ABE (27.5 g/L acetone, 75.5 g/L Butanol, 7.0 g/L ethanol vs. 7.9 g/L acetone, 16.2 g/L Butanol, 1.4 g/L ethanol) were produced in the fed-batch fermentation, with a higher Butanol productivity (0.34 g/L · h vs. 0.30 g/L · h) due to reduced Butanol inhibition by Butanol recovery. The first-stage gas stripping produced a condensate containing 155.6 g/L Butanol (199.9 g/L ABE), which after phase separation formed an organic phase containing 610.8 g/L Butanol (656.1 g/L ABE) and an aqueous phase containing 85.6 g/L Butanol (129.7 g/L ABE). Fed with the aqueous phase of the condensate from first-stage gas stripping, the second-stage pervaporation using the CNTs-PDMS MMM produced a condensate containing 441.7 g/L Butanol (593.2 g/L ABE), which after mixing with the organic phase from gas stripping gave a highly concentrated product containing 521.3 g/L Butanol (622.9 g/L ABE). The outstanding performance of CNTs-PDMS MMM can be attributed to the hydrophobic CNTs giving an alternative route for mass transport through the inner tubes or along the smooth surface of CNTs. This gas stripping-pervaporation process with less contaminated risk is thus effective in increasing Butanol production and reducing energy consumption.
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two stage in situ gas stripping for enhanced Butanol fermentation and energy saving product recovery
Bioresource Technology, 2013Co-Authors: Jingbo Zhao, Fangfang Liu, Shangtian YangAbstract:Abstract Two-stage gas stripping for Butanol recovery from acetone-Butanol-ethanol (ABE) fermentation with Clostridium acetobutylicum JB200 in a fibrous bed bioreactor was studied. Compared to fermentation without in situ gas stripping, more ABE (10.0 g/L acetone, 19.2 g/L Butanol, 1.7 g/L ethanol vs. 7.9 g/L acetone, 16.2 g/L Butanol, 1.4 g/L ethanol) were produced, with a higher Butanol yield (0.25 g/g vs. 0.20 g/g) and productivity (0.40 g/L·h vs. 0.30 g/L·h) due to reduced Butanol inhibition. The first-stage gas stripping produced a condensate containing 175.6 g/L Butanol (227.0 g/L ABE), which after phase separation formed an organic phase containing 612.3 g/L Butanol (660.7 g/L ABE) and an aqueous phase containing 101.3 g/L Butanol (153.2 g/L ABE). After second-stage gas stripping, a highly concentrated product containing 420.3 g/L Butanol (532.3 g/L ABE) was obtained. The process is thus effective in producing high-titer Butanol that can be purified with much less energy.
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fed batch fermentation for n Butanol production from cassava bagasse hydrolysate in a fibrous bed bioreactor with continuous gas stripping
Bioresource Technology, 2012Co-Authors: Congcong Lu, Jingbo Zhao, Shangtian YangAbstract:Concentrated cassava bagasse hydrolysate (CBH) containing 584.4 g/L glucose was studied for acetone–Butanol–ethanol (ABE) fermentation with a hyper-Butanol-producing Clostridium acetobutylicum strain in a fibrous bed bioreactor with gas stripping for continuous Butanol recovery. With periodical nutrient supplementation, stable production of n-Butanol from glucose in the CBH was maintained in the fed-batch fermentation over 263 h with an average sugar consumption rate of 1.28 g/L h and Butanol productivity of 0.32 ± 0.03 g/L h. A total of 108.5 g/L ABE (Butanol: 76.4 g/L, acetone: 27.0 g/L, ethanol: 5.1 g/L) was produced, with an overall yield of 0.32 ± 0.03 g/g glucose for ABE and 0.23 ± 0.01 g/g glucose for Butanol. The gas stripping process generated a product containing 10–16% (w/v) of Butanol, ∼4% (w/v) of acetone, a small amount of ethanol (<0.8%) and almost no acids, resulting in a highly concentrated Butanol solution of ∼64% (w/v) after phase separation.
Donald G Truhlar - One of the best experts on this subject based on the ideXlab platform.
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thermochemistry of radicals formed by hydrogen abstraction from 1 Butanol 2 methyl 1 propanol and butanal
Journal of Chemical Physics, 2012Co-Authors: Ewa Papajak, Prasenjit Seal, Donald G TruhlarAbstract:We calculate the standard state entropy, heat capacity, enthalpy, and Gibbs free energy for 13 radicals important for the combustion chemistry of biofuels. These thermochemical quantities are calculated from recently proposed methods for calculating partition functions of complex molecules by taking into account their multiple conformational structures and torsional anharmonicity. The radicals considered in this study are those obtained by hydrogen abstraction from 1-Butanol, 2-methyl-1-propanol, and butanal. Electronic structure calculations for all conformers of the radicals were carried out using both density functional theory and explicitly correlated coupled cluster theory with quasipertubative inclusion of connected triple excitations. The heat capacity and entropy results are compared with sparsely available group additivity data, and trends in enthalpy and free energy as a function of radical center are discussed for the isomeric radicals.
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statistical thermodynamics of 1 Butanol 2 methyl 1 propanol and butanal
Journal of Chemical Physics, 2012Co-Authors: Prasenjit Seal, Ewa Papajak, Tao Yu, Donald G TruhlarAbstract:The purpose of the present investigation is to calculate partition functions and thermodynamic quantities, viz., entropy, enthalpy, heat capacity, and Gibbs free energies, for 1-Butanol, 2-methyl-1-propanol, and butanal in the vapor phase. We employed the multi-structural (MS) anharmonicity method and electronic structure calculations including both explicitly correlated coupled cluster theory and density functional theory. The calculations are performed using all structures for each molecule and employing both the local harmonic approximation (MS-LH) and the inclusion of torsional anharmonicity (MS-T). The results obtained from the MS-T calculations are in excellent agreement with experimental data taken from the Thermodynamics Research Center data series and the CRC Handbook of Chemistry and Physics, where available. They are also compared with Benson's empirical group additivity values, where available; in most cases, the present results are more accurate than the group additivity values. In other case...
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statistical thermodynamics of 1 Butanol 2 methyl 1 propanol and butanal
Journal of Chemical Physics, 2012Co-Authors: Prasenjit Seal, Ewa Papajak, Donald G TruhlarAbstract:The purpose of the present investigation is to calculate partition functions and thermodynamic quantities, viz., entropy, enthalpy, heat capacity, and Gibbs free energies, for 1-Butanol, 2-methyl-1-propanol, and butanal in the vapor phase. We employed the multi-structural (MS) anharmonicity method and electronic structure calculations including both explicitly correlated coupled cluster theory and density functional theory. The calculations are performed using all structures for each molecule and employing both the local harmonic approximation (MS-LH) and the inclusion of torsional anharmonicity (MS-T). The results obtained from the MS-T calculations are in excellent agreement with experimental data taken from the Thermodynamics Research Center data series and the CRC Handbook of Chemistry and Physics, where available. They are also compared with Benson's empirical group additivity values, where available; in most cases, the present results are more accurate than the group additivity values. In other cases, where experimental data (but not group additivity values) are available, we also obtain good agreement with experiment. This validates the accuracy of the electronic structure calculations when combined with the MS-T method for estimating the thermodynamic properties of systems with multiple torsions, and it increases our confidence in the predictions made with this method for molecules and temperatures where experimental or empirical data are not available.
