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Ilung Chien - One of the best experts on this subject based on the ideXlab platform.
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energy efficient extraction distillation process for separating diluted acetonitrile water mixture rigorous design with experimental verification from ternary liquid liquid equilibrium data
Industrial & Engineering Chemistry Research, 2017Co-Authors: Ray Huang, Xin-yi Zhong, Ming-jer Lee, Ilung ChienAbstract:In this paper, an energy-efficient extraction–distillation process to separate diluted azeotropic acetonitrile–water mixtures is newly developed. Compared with the conventional azeotropic separation methods (i.e., extractive distillation), the potential dominant benefit of this proposed method is that the main separation task can be achieved by an extraction column without needing Reboiler Duty. In this work, an efficient solvent of n-propyl chloride is proposed to extract the organic compound into the extract phase and to let water remain in the raffinate phase. Ternary liquid–liquid equilibrium experiments are also conducted to verify the separation performance in the extraction column and decanter of the proposed process. It is found that significant savings of 40.3% in steam cost and 34.7% in total annual cost can be obtained by the proposed separation method as compared to that of a three-column extractive distillation system published in open literature.
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Energy-Efficient Extraction–Distillation Process for Separating Diluted Acetonitrile–Water Mixture: Rigorous Design with Experimental Verification from Ternary Liquid–Liquid Equilibrium Data
2017Co-Authors: Ray Huang, Xin-yi Zhong, Ming-jer Lee, Ilung ChienAbstract:In this paper, an energy-efficient extraction–distillation process to separate diluted azeotropic acetonitrile–water mixtures is newly developed. Compared with the conventional azeotropic separation methods (i.e., extractive distillation), the potential dominant benefit of this proposed method is that the main separation task can be achieved by an extraction column without needing Reboiler Duty. In this work, an efficient solvent of n-propyl chloride is proposed to extract the organic compound into the extract phase and to let water remain in the raffinate phase. Ternary liquid–liquid equilibrium experiments are also conducted to verify the separation performance in the extraction column and decanter of the proposed process. It is found that significant savings of 40.3% in steam cost and 34.7% in total annual cost can be obtained by the proposed separation method as compared to that of a three-column extractive distillation system published in open literature
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reactive distillation process for direct hydration of cyclohexene to produce cyclohexanol
Industrial & Engineering Chemistry Research, 2014Co-Authors: Borchang Chen, Yuanlin Lin, Hsiaoping Huang, Ilung ChienAbstract:Cyclohexanol is an important precursor in synthesizing intermediates of Nylons and also plasticizers. In this paper, a plantwide reactive-distillation process for the production of cyclohexanol by direct hydration of cyclohexene with water has been studied. Design with excess water is needed to economically increase conversion of cyclohexene to 99.9%. The optimal design of the proposed flowsheet also makes use of the natural liquid–liquid splitting of the binary cyclohexanol–water azeotrope. Realistic fresh cyclohexene feed with impurity of cyclohexane was also considered. This inert is designed to leave the system in the organic outlet stream of a decanter on top of the reactive-distillation column. The Reboiler Duty requirement of the proposed design flowsheet is compared with existing processes in open literature. It is found that significant energy savings can be realized by using this design.
Gary T. Rochelle - One of the best experts on this subject based on the ideXlab platform.
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approaching a reversible stripping process for co2 capture
Chemical Engineering Journal, 2016Co-Authors: Yu-jeng Lin, Gary T. RochelleAbstract:Amine scrubbing is the most mature CO2 capture technology for coal-fired power plants. However, the energy consumption for regeneration incurs a 20–25% penalty on electricity output. This loss can be reduced by alternative stripper design. This work uses exergy analysis to quantify the inefficiencies and demonstrate the effectiveness of a new configuration, the advanced flash stripper, without having to consider numerous alternatives. The lost work from the overhead condenser and the cross exchanger makes the simple stripper inefficient. The advanced flash stripper successfully eliminates the lost work of the condenser and improves the reversibility of the cross exchanger. It reduces the Reboiler Duty by 16% and the overall work requirement by 11% compared to the simple stripper. The new design when used with piperazine showed a remarkable 74% thermodynamic efficiency. Further improvement of energy efficiency is expected to be marginal. This work not only provides a better design that reduces the energy consumption, but also indicates that the state-of-the-art is approaching the theoretical work limit.
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Optimization of advanced flash stripper for CO2 capture using piperazine
Energy Procedia, 2014Co-Authors: Gary T. RochelleAbstract:Abstract CO 2 capture from coal-fired power plants using amine scrubbing typically incurs a 20–30% energy penalty. The major energy requirements are the Reboiler Duty for solvent regeneration and the compression work for CO 2 sequestration. The advanced flash stripper using 8 m PZ was proposed, which recovers the stripping steam heat by employing cold and warm rich bypasses. The objective of this work is to quantify the benefits of the advanced regeneration system as energy and capital cost. The advanced flash stripper saves 10% total equivalent work that includes heat Duty work, compression work, and pumping work compared to the simple stripper. From the economic analysis, it was found that the compressor and the cross exchangers are the two major capital costs of the regeneration system. By considering the cost of the main heat exchangers, the temperature approaches and pressure drops of the cross exchanger and the steam heater were optimized. The optimum LMTD of the cross exchanger is around 10 K, which saves 8% regeneration cost compared to the base case with 5 K. The annualized regeneration cost of the advanced flash stripper is $31/tonne CO 2 at the optimum lean loading 0.20, providing 15% cost savings compared to the base case simple stripper (5 K cross exchanger LMTD).
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regeneration with rich bypass of aqueous piperazine and monoethanolamine for co2 capture
Industrial & Engineering Chemistry Research, 2014Co-Authors: Yu-jeng Lin, Tarun Madan, Gary T. RochelleAbstract:Amine scrubbing is the most mature CO2 capture technology for fossil fuel power plants, but the energy use for CO2 regeneration and compression will be 20 to 25% of the power plant output. The objective of this work is to develop alternative stripper configurations that reduce the energy use of CO2 capture. The advanced stripper configurations were modeled and optimized using Aspen Plus. Total equivalent work was used as an indicator of overall energy performance accounting for Reboiler Duty, compression work, and pump work. The rich exchanger bypass recovers stripping steam heat by using an exchanger. To get better energy performance, this strategy was applied to advanced configurations including a Reboiler-based stripper, an interheated stripper, and a flash stripper. Both 9 m monoethanolamine (MEA) and 8 m piperazine (PZ) were investigated. The best energy performance was obtained from the stripper with a warm rich bypass and a rich exchanger bypass, which provides 10% less equivalent work for PZ and 6...
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innovative absorber stripper configurations for co2 capture by aqueous monoethanolamine
Industrial & Engineering Chemistry Research, 2006Co-Authors: Majeed S Jassim, Gary T. RochelleAbstract:The state-of-the-art technology to capture CO2 from coal-fired power plants is absorption/stripping with aqueous monoethanolamine (MEA). The energy consumption in stripping can be 15−30% of the power-plant output. A rigorous rate-based model for CO2−MEA−H2O was used to simulate several flowsheet alternatives that reduce the energy requirement using Aspen Plus with RateFrac. Results were calculated for vapor recompression, multipressure, and simple strippers at 5 and 10 °C approach temperatures and 70, 90, and 95% CO2 removal. The “equivalent work of steam/mole of CO2 removed” and the Reboiler Duty were used to compare the proposed schemes and to show the shift of energy use from work to heat. The total equivalent work for multipressure was less than that for the simple stripper by 0.03−0.12 GJ/(ton of CO2), and the Reboiler Duty was less by 0.15−0.41 GJ/(ton of CO2). The multipressure with vapor recompression is an attractive option because it utilizes the overhead water vapor latent heat to reduce reboil...
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aqueous piperazine potassium carbonate for enhanced co2 capture
Greenhouse Gas Control Technologies 7#R##N#Proceedings of the 7th International Conference on Greenhouse Gas Control Technologies 5– September 2004 Va, 2005Co-Authors: Tim J Cullinane, Babatunde A Oyenekan, Jennifer Lu, Gary T. RochelleAbstract:Publisher Summary This chapter presents experimental and modeling results for aqueous piperazine (PZ)/potassium carbonate (K 2 CO 3 ) for enhanced CO 2 capture from flue gas. CO 2 removal by aqueous absorption/stripping is a mature technology currently used in the manufacture of ammonia and syngas. The use of aqueous K 2 CO 3 promoted by PZ should enhance rates of CO 2 absorption and reduce the heat requirement for stripping. Simple models have been developed to estimate absorber and stripper performance. The piperazine solvent can also be used to provide 90% CO 2 removal with a rich loading and packing height that would give only 75% removal with monoethanolamine (MEA). Because 5m K + /2.5m PZ provides a richer solution and greater optimum capacity, the Reboiler Duty with 5m K + /2.5m PZ in a simple absorption/stripping process can be 25 to 46 % less that that with 7m MEA. Additional heat savings up to 6% may be achieved by operating the stripper at greater pressure.
Yinglong Wang - One of the best experts on this subject based on the ideXlab platform.
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dynamic control of hybrid processes with liquid liquid extraction for propylene glycol methyl ether dehydration
Industrial & Engineering Chemistry Research, 2018Co-Authors: Tingran Zhao, Jingwei Yang, Dongmei Xu, Yinglong WangAbstract:Dynamic control structures are significant for liquid–liquid extraction combined with heterogeneous azeotropic distillation (LEHAD) and liquid–liquid extraction combined with extractive distillation (LEED) processes, which were proposed in our previous work for the separation of the azeotrope of propylene glycol methyl ether and water. However, there may be complications regarding the dynamic controllability of the two hybrid processes, and this work investigates the dynamic control structures. For the LEHAD process, an improved composition–temperature cascade control structure using the ratio of the Reboiler Duty to feed flow (QR/F) can realize effective control when feed disturbances are added. For the LEED process, the improved dual temperature control structure with QR/F was able to handle the disturbances well. Moreover, a comparison between the two hybrid processes was made according to the dynamic controllability, and the integral of the squared errors was calculated. The results show that the LEHA...
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separation of azeotrope 2 2 3 3 tetrafluoro 1 propanol water via heterogeneous azeotropic distillation by energy saving dividing wall column process design and control strategies
Chemical Engineering Research & Design, 2018Co-Authors: Puyun Shi, Jinfu Ding, Jun Gao, Yinglong WangAbstract:Abstract To separate the azeotrope of 2,2,3,3-tetrafluoro-1-propanol (TFP) and water, the energy-saving heterogeneous azeotropic dividing-wall column (DWC) is proposed using chloroform as an azeotropic agent. Compared with the conventional design, the total condenser Duty reduction of 44.57%, total Reboiler Duty reduction of 42.66% and TAC reduction of 37.79% by the DWC design are obtained. Based on the simulation results, the energy-saving in the DWC design is due to the thermal coupling of the conventional design and the separation of water by the decanter with the purity of 99.5 mol%, rather not to the removal of remixing effect for the column sequence. The control strategy performance for the conventional and DWC designs are satisfactory, since TFP and water are separated with high purity, despite the disturbances of the flow rate of fresh feed, fresh feed composition and liquid split ratio.
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Dynamic Control of Hybrid Processes with Liquid–Liquid Extraction for Propylene Glycol Methyl Ether Dehydration
2018Co-Authors: Tingra Zhao, Jingwei Yang, Zhaoyou Zhu, Yinglong WangAbstract:Dynamic control structures are significant for liquid–liquid extraction combined with heterogeneous azeotropic distillation (LEHAD) and liquid–liquid extraction combined with extractive distillation (LEED) processes, which were proposed in our previous work for the separation of the azeotrope of propylene glycol methyl ether and water. However, there may be complications regarding the dynamic controllability of the two hybrid processes, and this work investigates the dynamic control structures. For the LEHAD process, an improved composition–temperature cascade control structure using the ratio of the Reboiler Duty to feed flow (QR/F) can realize effective control when feed disturbances are added. For the LEED process, the improved dual temperature control structure with QR/F was able to handle the disturbances well. Moreover, a comparison between the two hybrid processes was made according to the dynamic controllability, and the integral of the squared errors was calculated. The results show that the LEHAD process has better dynamic controllability than the LEED process
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Control of a Ternary Extractive Distillation Process with Recycle Splitting Using a Mixed Entrainer
2017Co-Authors: Xia Zhang, Zhaoyou Zhu, Yongteng Zhao, Huixin Wang, Bin Qin, Nan Zhang, Yinglong WangAbstract:Dynamic control of the ternary extractive distillation process is complex, due to the relatively high number of operating parameters and interactions between multiple azeotropes. In this research, the control structures of the ternary extractive distillation using dimethyl sulfoxide and a mixed solvent of dimethyl sulfoxide and ethylene glycol, as the entrainer, were explored for separating tetrahydrofuran/ethanol/water. A composition with a ratio of Reboiler Duty to mole feed flow rate control structure was proposed to obtain good dynamic responses for the ternary extractive distillation process with dimethyl sulfoxide and mixed entrainer. Moreover, control comparisons of the ternary extractive distillation with dimethyl sulfoxide and mixed entrainer demonstrated that the dynamic performances of the extractive distillation with mixed entrainer were better compared with the process using dimethyl sulfoxide. These studies contribute to the development of controllability for ternary extractive distillation processes for separating ternary or multicomponent azeotropic mixtures
Ray Huang - One of the best experts on this subject based on the ideXlab platform.
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energy efficient extraction distillation process for separating diluted acetonitrile water mixture rigorous design with experimental verification from ternary liquid liquid equilibrium data
Industrial & Engineering Chemistry Research, 2017Co-Authors: Ray Huang, Xin-yi Zhong, Ming-jer Lee, Ilung ChienAbstract:In this paper, an energy-efficient extraction–distillation process to separate diluted azeotropic acetonitrile–water mixtures is newly developed. Compared with the conventional azeotropic separation methods (i.e., extractive distillation), the potential dominant benefit of this proposed method is that the main separation task can be achieved by an extraction column without needing Reboiler Duty. In this work, an efficient solvent of n-propyl chloride is proposed to extract the organic compound into the extract phase and to let water remain in the raffinate phase. Ternary liquid–liquid equilibrium experiments are also conducted to verify the separation performance in the extraction column and decanter of the proposed process. It is found that significant savings of 40.3% in steam cost and 34.7% in total annual cost can be obtained by the proposed separation method as compared to that of a three-column extractive distillation system published in open literature.
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Energy-Efficient Extraction–Distillation Process for Separating Diluted Acetonitrile–Water Mixture: Rigorous Design with Experimental Verification from Ternary Liquid–Liquid Equilibrium Data
2017Co-Authors: Ray Huang, Xin-yi Zhong, Ming-jer Lee, Ilung ChienAbstract:In this paper, an energy-efficient extraction–distillation process to separate diluted azeotropic acetonitrile–water mixtures is newly developed. Compared with the conventional azeotropic separation methods (i.e., extractive distillation), the potential dominant benefit of this proposed method is that the main separation task can be achieved by an extraction column without needing Reboiler Duty. In this work, an efficient solvent of n-propyl chloride is proposed to extract the organic compound into the extract phase and to let water remain in the raffinate phase. Ternary liquid–liquid equilibrium experiments are also conducted to verify the separation performance in the extraction column and decanter of the proposed process. It is found that significant savings of 40.3% in steam cost and 34.7% in total annual cost can be obtained by the proposed separation method as compared to that of a three-column extractive distillation system published in open literature
Nilay Shah - One of the best experts on this subject based on the ideXlab platform.
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dynamic modelling and analysis of a coal fired power plant integrated with a novel split flow configuration post combustion co2 capture process
International Journal of Greenhouse Gas Control, 2014Co-Authors: Mac N Dowell, Nilay ShahAbstract:Abstract We present a model of a coal-fired power plant integrated with a dynamic model of a monoethanolamine (MEA)-based post-combustion CO2 capture process. We evaluate base- and part-load operating modes of the integrated power and CO2 capture plant. We propose a simple modification to the base-process which exploits the tradeoff between thermodynamic and rate or kinetic driving forces for mass transfer. This modification returns a portion of the regenerated solvent to the middle of the absorption column at an elevated temperature. Under base-load operation of the power plant, this modification was observed to increase the degree of CO2 capture by 9.9% and reduce the Reboiler Duty by 8.3%, improving the net electrical efficiency of the decarbonised power plant from 28.27% to 29.15% – a relative increase of 2.8%. Under part-load operation, the degree of CO2 capture increased by 1% with a concurrent reduction in Reboiler Duty of 16.7% and an increase in overall process efficiency of 3.25%.
