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1. Kinetics of corrosive sulfur adsorption in transformer oil with Ag-Y, Ce-Y and Cu-Y zeolites | |||
Jun Hu,Deliang He,Tao wan,Huibin Lei,Yao Lu,Houqiang Huang | |||
Chemical Engineering 22 May 2018 | |||
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Abstract:The Ag-Y, Ce-Y and Cu-Y zeolites were successfully prepared for removing corrosive sulfur from transformer insulating oil. The adsorptions and kinetics of corrosive sulfur on Ag-Y, Ce-Y and Cu-Y were studied, and activation energies (Ea) of adsorption processes were calculated. The results show that the desulfurization properties of these three adsorbents were Ag-Y > Ce-Y > Cu-Y, and 0.5wt% Ag-Y adsorption capacity of DBDS and NDM was up to 15.2mg/g and 18.8mg/g respectively. The kinetics for the adsorption process can be described by pseudo-second-order model and adsorption rate constants increase with an increase of temperature, indicating the endothermic nature of the adsorption. The adsorption process on Ag-Y was dominated by chemical adsorption, whereas the adsorption process on Ce-Y was dominated by physical adsorption, and the adsorption on Cu-Y was performed simultaneously by chemical and physical adsorption. | |||
TO cite this article:Jun Hu,Deliang He,Tao wan, et al. Kinetics of corrosive sulfur adsorption in transformer oil with Ag-Y, Ce-Y and Cu-Y zeolites[OL].[22 May 2018] http://en.paper.edu.cn/en_releasepaper/content/4745164 |
2. Modified Langmuir equation for predicting type II adsorption isotherms | |||
ZHANG Peikun | |||
Chemical Engineering 07 May 2017 | |||
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Abstract:The Langmuir adsorption isotherm equation is modified to include more parameters for fitting Type II isotherms according the Brunauer classification. Unlike some isotherm equations which have a singularity when pressure equal to saturation vapor pressure, one advantage of the modified Langmuir equation is its validity when the iterative value of adsorbate pressure reaches a value around the saturation vapor pressure in numerical simulation. With four equation constants, the modified Langmuir equation fits the full range of isotherms with high accuracy for water on the adsorbents discussed. | |||
TO cite this article:ZHANG Peikun. Modified Langmuir equation for predicting type II adsorption isotherms[OL].[ 7 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4727248 |
3. Thermal regeneration of spent CeY sorbent used for thiophene adsorption from benzene | |||
LV longfei,LIAO Junjie,XIE Yuanyuan,FAN Lijun,CHANG Liping,BAO Weiren | |||
Chemical Engineering 05 August 2016 | |||
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Abstract:Benzene is an important chemical raw material, and coking benzene is one of its main resources, so the thiophene impurity should be deeply removed. The CeY adsorbent prepared by NaY zeolite ion-exchanging by cerium ion has been reported an excellent adsorption desulfurization ability. Thus it is necessary to investigate its regeneration behavior. In this paper, the spent CeY sorbent adsorbing thiophene in benzene (TBY) was regenerated by thermal treatment under various conditions. The desulfurization efficiency of regenerated TBY samples was measured by static adsorption experiment. The results show that the regeneration temperature, regeneration time and oxygen content are the main influence factors for the regeneration of TBY samples. The regenerated performance of sorbent is mainly affected by sulfur and carbon content remained. The optimized regeneration condition is air atmosphere with the space velocity of 1000 h-1 at 500 oC for 1 h, and the corresponding desulfurization efficiency of regenerated TBY sample is over 96%. | |||
TO cite this article:LV longfei,LIAO Junjie,XIE Yuanyuan, et al. Thermal regeneration of spent CeY sorbent used for thiophene adsorption from benzene[OL].[ 5 August 2016] http://en.paper.edu.cn/en_releasepaper/content/4701982 |
4. Effluence of modification on the deep desulfurization behavior of NaY and Na13X zeolite for thiophene | |||
LIAO Junjie,Liu Yang,Bao Lei,Chang Liping,Bao Weiren | |||
Chemical Engineering 05 August 2016 | |||
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Abstract:NaY and Na13X zeolites were modified by different modification manners, which are H+ modification, metal ion (copper, nickel or cerium ions) modification and H+ modification followed by metal ion modification, to prepare series of sorbents. The properties of these sorbents were measured by XRD, N2 adsorption and SEM/EDS. The desulfurization activity of these sorbents was evaluated in a model gasoline made of thiophene and cyclohexane, and the results were compared to investigate the effect of preparation methods on adsorption desulfurization behavior. The results show that H+ modification or metal ion modification could all improve the desulfurization efficiency of both NaY and Na13X zeolites, however, for Na13X, after modified by copper or nickel ions, its crystal structure was destroyed, and thus the desulfurization efficiency is much lower than before. The desulfurization activity of the sorbents prepared via H+ modification followed by metal ion modification is higher than that of sorbents prepared by single H+ modification or metal ion modification because pre-modification by H+ can increase the metal content, specific surface and pore volume of sorbent in the following metal ion modification process. Compared with Na13X, NaY is more suitable for H+ modification followed by metal ion modification. Among those prepared sorbents, the CuHY sorbent prepared via NaY modified via H+ and followed by copper ion, has the highest desulfurization efficiency at room temperature. | |||
TO cite this article:LIAO Junjie,Liu Yang,Bao Lei, et al. Effluence of modification on the deep desulfurization behavior of NaY and Na13X zeolite for thiophene[OL].[ 5 August 2016] http://en.paper.edu.cn/en_releasepaper/content/4701979 |
5. Approaching to a Precise Determination of the Solid-State Transformation Temperature of an Enantiotropic System: Gestodene | |||
WANG Liyu,ZHU Liang,LI Xianchao,SHA Zuoliang | |||
Chemical Engineering 16 June 2015 | |||
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Abstract:The objective of this work is to accurately measure the solid-state transformation temperature (Ttr) of two crystalline forms (form Ⅰ and form Ⅱ) of gestodene by three distinct methods. The polymorphic transformation among two polymorphs (form Ⅰ to form Ⅱ) was observed by differential scanning calorimetry (DSC) and variable temperature X-ray powder diffraction (VT-XRPD) measurements. Therefore, Ttr was evaluated as the onset transformation temperature by DSC at seven different heating rates ranging from 2 to 20 K min-1. In the solubility data method, Ttr is calculated as the temperature at which solubilities of the two forms are equal to each other. The solubility data of both polymorphs were measured gravimetrically in ethanol in the temperature range from 268.15 to 333.15 K under the atmospheric pressure of 0.10 MPa. The experimental solubility data were used to calculate the solid-solid transformation temperature based on the modified Apelblat and van't Hoff equation. In the last method, Ttr is determined directly by experimental studies of the temperature ranges of the stability of each polymorph. The mixture of both forms was agitated in a saturated solution at the programming temperature. X-ray powder diffractometer (XRPD) was used to determine the solid-state form of the residual crystals in suspension at equilibrium. The solid-solid transformation temperature of gestodene, determined with the DSC method, solubility data method and isothermal method, were found to be 313.44 K, 296.90 K (Apelblat equation), 298.11 K (van't Hoff equation) and 293.65 ± 0.5 K, respectively. As it can be observed, the mechanisms of the polymorphic transformation determined by different methods are different. Therefore, the calculated transformation temperature exhibits small difference by distinct methods. | |||
TO cite this article:WANG Liyu,ZHU Liang,LI Xianchao, et al. Approaching to a Precise Determination of the Solid-State Transformation Temperature of an Enantiotropic System: Gestodene[OL].[16 June 2015] http://en.paper.edu.cn/en_releasepaper/content/4647722 |
6. Investigating and Molecular Understanding of Odd-Even Alternation of the Nucleation Kinetics of Dicarboxylic Acids in Ethanol | |||
ZHANG Hui,YIN Qiuxiang,XIE Chuang | |||
Chemical Engineering 19 December 2014 | |||
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Abstract:Odd-even alternations in thermodynamic properties (melting point, solubility enthalpy, sublimation, etc.) are well-known in the alkyl derivatives. But few attentions are focused on kinetics, which is essential for the design of manufacture process. In this work, the nucleation kinetics of a series of dicarboxylic acids (HOOC-(CH2) n-2-COOH, n=4-12) in ethanol were determined based on induction time measurement at constant supersaturations. The results revealed that the odd-even alternation existed in kinetics as well: odd acids (n=odd) exhibited quicker nucleations compared to the even ones (n=even). We attempted to give insight into the odd-even alternation machenism of nucleation kinetics. Detailed investigations were carried out on molecular arrangements and intermolecular interactions. The energies of intramolecular torsions and intermolecular interacitons were calculated using Materials studio (Accelrys Software Inc.). Relatively higher torsional energy barriers in odd acids crystals and larger interaction energies between odd diacids and ethanol molecules were observed and believed to cause slower nuclei formation of odd acids during solution crystallization compared to even ones. Furthermore, nucleation kinetics is definitely useful for the development of crystallization processes for dicarboxylic acids.this paper. | |||
TO cite this article:ZHANG Hui,YIN Qiuxiang,XIE Chuang. Investigating and Molecular Understanding of Odd-Even Alternation of the Nucleation Kinetics of Dicarboxylic Acids in Ethanol[OL].[19 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4623919 |
7. Solid-liquid phase diagram for indomethacin-nicotinamide-methanol or methanol/ethyl acetate mixture and solubility behavior of 1:1 indomethacin-nicotinamide cocrystal at (298.15 and 313.15) K | |||
SUN Xiaowei,YIN Qiuxiang,XIE Chuang | |||
Chemical Engineering 19 December 2014 | |||
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Abstract:Solid-liquid equilibrium data for indomethacin (IMC) and nicotinamide (NCT) in both methanol (MeOH) and methanol/ethyl acetate (EA) mixture were measured using static method at (298.15 and 313.15) K under atmospheric pressure. 1:1 IMC-NCT cocrystal and IMCoMeOH was found in both systems under investigated conditions. The solubility of 1:1 IMC-NCT cocrystal was correlated using a mathematical model considering solution complexation. Solubility of IMC-NCT cocrystals as a function of co-former (NCT) concentration was evaluated. It's found that temperature has great effects on the formation of methanol solvate in the investigated systems. Solvate formation could be suppressed either by increasing temperature or using solvent mixtures. Additionally, solvent mixtures could level out the solubility differences between IMC and NCT, resulting in larger and more symmetric region for IMC-NCT cocrystal which would be helpful to the development of the 1:1 IMC-NCT cocrystallization process. | |||
TO cite this article:SUN Xiaowei,YIN Qiuxiang,XIE Chuang. Solid-liquid phase diagram for indomethacin-nicotinamide-methanol or methanol/ethyl acetate mixture and solubility behavior of 1:1 indomethacin-nicotinamide cocrystal at (298.15 and 313.15) K[OL].[19 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4623875 |
8. Study of air debromination process and Br2 equilibrium concentration during the preparing course of liquid salt from brine waste of desalination plants | |||
Guo Xiaojun,Yuan Junsheng,Liu Xuezhong,Li Hong,Wang Jun,Zhao Yingying,Yang Chaopeng | |||
Chemical Engineering 09 December 2014 | |||
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Abstract:In this paper process conditions of debromination are investigated and equilibrium concentration of Br2 is analyzed at normal temperatures and pressures for brine waste of desalination plants. Effects of equilibrium concentration of Br2 on different temperature and pressure have been studied by process simulation. The results show air feed rate has an impact on the removal rate of Br2, the greater flow rate of air; the shorter time to achieve the balance of debromination is needed. On the other hand, the smaller flow rate of air needs the more time. It's no effect of flow rate of air on the equilibrium concentration of Br2 in brine. The higher operation temperature, the lower equilibrium concentration of Br2 can be achieved, so high temperature is good for debromination of brine waste. The lower the operating pressure is in favor of removal of Br2, however, the operating pressure has less affected on equilibrium concentration of Br2 than the operating temperature. | |||
TO cite this article:Guo Xiaojun,Yuan Junsheng,Liu Xuezhong, et al. Study of air debromination process and Br2 equilibrium concentration during the preparing course of liquid salt from brine waste of desalination plants[OL].[ 9 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4622736 |
9. Effect of ligand-based functionalization on aromatics adsorption and separation in zirconium-based metal-organic frameworks: A computational study | |||
WU Ying,LIU Defei,QIAN Yu,XI Hongxia | |||
Chemical Engineering 04 November 2014 | |||
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Abstract:The adsorption and separation properties of benzene and toluene on the zirconium-based frameworks UiO-66, -67, -68 and their functional analogues UiO-Phe and UiO-Me2 were studied using grand canonical Monte Carlo (GCMC) simulations, density functional theory (DFT) and ideal adsorbed solution theory (IAST). Remarkable higher adsorption uptakes of benzene and toluene at low pressures on UiO-Phe and -Me2 were found compared to their parent framework UiO-67. It can ascribed to the presence of functional groups (aromatic rings and methyl groups) that significantly intensified the adsorption, majorly by reducing the effective pore size and increasing the interaction strength with the adsorbates. While pore volumes and accessible surfaces of the frameworks turned to be the dominant factors governing the adsorption at high pressures. In the case of toluene/benzene separation, toluene selectivities on UiOs showed a two-stage separation behavior at the measured pressure range, resulting from the greater interaction affinities of toluene at low pressures and steric hindrance effects at high pressures. Additionally, the enhanced π delocalization and suitable pore size of UiO-Phe corporately gave rise to the highest toluene selectivity, suggesting the ligand functionalization strategy could reach both high adsorption capacity and separation selectivity from aromatic mixtures at low concentrations. | |||
TO cite this article:WU Ying,LIU Defei,QIAN Yu, et al. Effect of ligand-based functionalization on aromatics adsorption and separation in zirconium-based metal-organic frameworks: A computational study[J]. |
10. One-step photocatalysis-assisted adsorptive desulfurization of diesel over doped-TiO2 under ambient conditions | |||
WANG Xun,XIAO Jing | |||
Chemical Engineering 12 September 2014 | |||
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Abstract:One-pot photocatalysis-assisted adsorptive desulfurization (ADS) of diesel by using bi-functional doped-TiO2 adsorbents with molecular oxygen in air under ambient conditions was developed, which achieved high ADS capacity of 1.89 mg-S/g-Ads. The developed approach provides a new path for ultra-clean fuel production. | |||
TO cite this article:WANG Xun,XIAO Jing. One-step photocatalysis-assisted adsorptive desulfurization of diesel over doped-TiO2 under ambient conditions[OL].[12 September 2014] http://en.paper.edu.cn/en_releasepaper/content/4609616 |
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