Triethylene glycol monoethyl ether(CH_(3)CH_(2)O-(CH_(2)CH_(2)O)_(3)H,EtO(EO)_(3)H)is a valuable finechemical material.Its unique physical properties andchemical characteristics make it a major component ofthe super b...Triethylene glycol monoethyl ether(CH_(3)CH_(2)O-(CH_(2)CH_(2)O)_(3)H,EtO(EO)_(3)H)is a valuable finechemical material.Its unique physical properties andchemical characteristics make it a major component ofthe super brake fluid for automobiles[1,2].In general,EtO(EO)_(3)H is synthesized from the ethoxylation re-action of ethanol with ethylene oxide(EO)in thepresence of the KOH catalyst.展开更多
Terbium-picrate triethylene glycol（EO3-Tb-Pic） complex was prepared in thin film and single layer device structure of ITO/EO3-Tb-Pic/Al, using spin coating technique. The UV-Vis absorption spectroscopy analysis was ...Terbium-picrate triethylene glycol（EO3-Tb-Pic） complex was prepared in thin film and single layer device structure of ITO/EO3-Tb-Pic/Al, using spin coating technique. The UV-Vis absorption spectroscopy analysis was performed to evaluate the electronic molecular transition of the complex. The optical band gap, Eg estimated from the Tauc model revealed that EO3-Tb-Pic thin film exhibited a direct transition with Eg of 2.70 eV. The electronic parameters of the ITO/EO3-Tb-Pic/Al device such as the ideality factor n, barrier height Φb, saturation current Io, and series resistance Rs, were extracted from the conventional lnI-V, Cheung＇s functions and Norde＇s method. It was found that the evaluated parameters calculated from Norde＇s and Cheung＇s methods were consistent with those calculated from the conventional I-V method. In the double logarithmic I-V plot, three distinct regions based on the slope were identified, and the conduction mechanisms were discussed and explained. The mobility, μ value was estimated from SCLC region as 2.58×10^–7 cm2/（V·s）. This newly obtained lanthanide complex may be potentially utilized in electronic devices.展开更多
Physical solvents such as ethylene glycol （EG）, diethylene glycol （DEG）, and triethylene glycol （TEG） are commonly used in wet gas dehydration processes with TEG being the most popular due to ease of regeneratio...Physical solvents such as ethylene glycol （EG）, diethylene glycol （DEG）, and triethylene glycol （TEG） are commonly used in wet gas dehydration processes with TEG being the most popular due to ease of regeneration and low solvent losses. Unfortunately, TEG absorbs significantly more hydrocarbons and acid gases than EG or DEG. Quantifying this amount of absorption is therefore critical in order to minimize hydrocarbon losses or to optimize hydrocarbon recovery depending on the objective of the process. In this article, a new correlation that fully covers the operating ranges of TEG dehydration units is developed in order to determine the solubility of light alkanes and acid gases in TEG solvent. The influence of several parameters on hydrocarbon and acid gas solubility including temperature, pressure, and solvent content is also examined.展开更多
A plasticizer triethylene glycol maleate（TEG-MA） was synthesized. The dominated monoester of moderate hydrophobicity with apparent oil-water partition coefficient of 0.042 in the product was confirmed by acid value ...A plasticizer triethylene glycol maleate（TEG-MA） was synthesized. The dominated monoester of moderate hydrophobicity with apparent oil-water partition coefficient of 0.042 in the product was confirmed by acid value determination, HPLC and FTIR. Its plasticizing effect on oxidized starch was manifested by crystallization, aging behaviour, moisture absorption, and mechanical performance. X-ray diffraction data showed that the relative crystallinity of the plasticized starch decreased. Both the crystal and the crystallinity of starch films were rarely changed in aging. Moisture absorption relied on the ester content and relative humidity. The elongation at break increased significantly with plasticizer content more than 10% in the matrix.展开更多
The operation of dehydration is very important in the process of gas transportation. This study aims to evaluate the application feasibility of CO_(2) dehydration using triethylene glycol, which is also called TEG for...The operation of dehydration is very important in the process of gas transportation. This study aims to evaluate the application feasibility of CO_(2) dehydration using triethylene glycol, which is also called TEG for short. Aspen Plus software was used to simulate the dehydration process system of CO_(2) gas transportation using TEG dehydration. Parameter analysis and process improvement were carried out for the simulation of dehydration process. At first, a sensitivity analysis was conducted to analyze and optimize operating conditions of conventional CO_(2)-TEG dehydration process system. Subsequently, a recycle unit was introduced into the conventional CO_(2)-TEG dehydration process system, it can be found that the improved process system with the recycle unit has a higher CO_(2) recovery rate which was about 9.8% than the conventional one. Moreover, the improved process system showed excellent operation stability through the comparison of simulation results of several processes with various water contents in their feed gases. Although the energy consumption is increased by about 2%, the improved process was economically and technically feasible for the long-term availability of CO_(2) pipeline transportation. The simulated results showed that the improved CO_(2)-TEG process system has promising application prospects in CO_(2) dehydration of CO_(2) gas transportation with high stability.展开更多
A mechanically strong binder with polar functional groups could overcome the dilemma of the large volume change during charge/discharge processes and poor cyclability of lithium-sulfur batteries(LSBs).In this work,for...A mechanically strong binder with polar functional groups could overcome the dilemma of the large volume change during charge/discharge processes and poor cyclability of lithium-sulfur batteries(LSBs).In this work,for the first time,we report the use of poly(thiourea triethylene glycol)(PTTG)as a multifunctional binder for sulfur cathodes to enhance the performance of LSBs.As expected,the PTTG binder facilitates the high performance and stability delivered by the Sulfur-PTTG cathode,including a higher reversible capacity of 825 mAh g^(-1) at 0.2 C after 80 cycles,a lower capacity fading(0.123%per cycle)over 350 cycles at 0.5 C,a higher areal capacity of 2.5 mAh cm^(-2) at 0.25 mA cm^(-2),and better rate capability of 587 mAh g^(-1) at 2 C.Such superior electrochemical performances could be attributed to PTTG's strong chemical adsorption towards polysulfides which may avoid the lithium polysulfide shuttle effect and excellent mechanical characteristics which prevents electrode collapse during cycling and allows the Sulfur-PTTG electrode to maintain robust electron and ion migration pathways for accelerated redox reaction kinetics.展开更多
A triethylene glycol modified glassy carbon electrode （TEG-GCE） was fabricated by a controlled- potential electrolysis procedure. The performance of the film on the modified electrode surface was investigated by cyc...A triethylene glycol modified glassy carbon electrode （TEG-GCE） was fabricated by a controlled- potential electrolysis procedure. The performance of the film on the modified electrode surface was investigated by cyclic voltammetry with different probes. It was firstly found that while neutral pieces could penetrate the TEG film on the GCE surface, the ionic pieces, whatever it is anion or cation, was blocked by the film. This property was successfully used for determining dopamine （DA） in the presence of ascorbic acid （AA） with differential pulse voltammetry （DPV）.展开更多
Tall towers with large diameters on floating liquefied natural gas devices are highly sensitive to sway.If tower equipment is relatively high,swaying can easily cause uneven gaseliquid contact in the tower,inhibiting ...Tall towers with large diameters on floating liquefied natural gas devices are highly sensitive to sway.If tower equipment is relatively high,swaying can easily cause uneven gaseliquid contact in the tower,inhibiting its absorption capacity.In this paper,gaseliquid counterflow triethylene glycol dehydration absorption towers are taken as the research object.A porous medium model was used to simplify the packing environment,and the EulereEuler method was used to simulate the flow field in the tower.The flow field encompasses the effects of the gaseliquid phase dispersion force,gaseliquid phase diffusion coefficient,and interphase mass transfer.By introducing a dynamic grid model to establish sway boundary conditions,we quantitatively examine the influence of sway duration and angle on gaseliquid flow and mass transfer performance in absorption towers.The results show that,when the sloshing angle of the absorption tower is 9°and the sloshing period is 20 s,the influence of the disturbance of the absorption tower's internal flow field is increased by 85%and 78%respectively compared with normal working conditions.When the sloshing angle of the absorption tower is 9°and the sloshing period exceeds 21 s,the gaseliquid mass transfer inside the absorption tower diminishes.When the sloshing period of the regeneration tower is 6 s and the sloshing angle reaches 20°,the mass fraction of poor ethylene glycol in the regeneration tower fluctuates significantly in the first sloshing cycle,and unqualified products appear.展开更多
The thermal behavior and kinetic parameters of the decomposition reaction of triethylene glycol dinitrate (TEGDN) in a temperature-programmed mode at different pressures (0.1, 2, 4 and 6 MPa) have been investigated by...The thermal behavior and kinetic parameters of the decomposition reaction of triethylene glycol dinitrate (TEGDN) in a temperature-programmed mode at different pressures (0.1, 2, 4 and 6 MPa) have been investigated by means of DSC and TG-DTG. The results show that the properties of the thermal decomposition of TEGDN are affected by the change of pressure, and the kinetic model function, the apparent activation energy Ea and pre-exponential factor A of this reaction are []122(1)ln(1)aa---, 106.54 kJ昺ol-1 and 109.17 s-1 at 0.1 MPa, and 120.82 kJ昺ol-1 and 1010.56 s-1 at 2 MPa, respectively. The critical temperature of thermal explosion of TEGDN obtained by the values Teo and Tpo of the onset temperature Te and the peak temperature TP when the heat-ing rate tends to zero are 191.05, 209.86 ℃ at 0.1 MPa, 207.59 and 221.65 ℃ at 2 MPa, respectively.展开更多
An inherent problem with natural gas production or transmission is the formation of gas hydrates, which can lead to safety hazards for production/transportation systems, and substantial economic risks. Hydrate inhibit...An inherent problem with natural gas production or transmission is the formation of gas hydrates, which can lead to safety hazards for production/transportation systems, and substantial economic risks. Hydrate inhibition with different inhibitors such as, methanol, ethylene glycol （EG）, triethylene glycol （TEG）, and sodium chloride solution continues to play a critical role in many operations. An understanding of when the hydrates form in the presence of these hydrate inhibitors, is therefore necessary to overcome hydrate problems. Several thermodynamic models have been proposed for predicting the hydrate formation conditions in aqueous solutions containing methanol/glycols and electrolytes. However, available models have limitations that include the types of liquid, compositions of fluids, and inhibitors used. The aim of this study is to develop a simple-to-use correlation for accurate prediction of hydrate-forming pressures of pure alkanes in the presence of different hydrate inhibitors, where the obtained results illustrate good agreement with the reported experimental data.展开更多
Nanocapsules with triethylene glycol dimethacrylate （TEGDMA） as core material and polyurethane as wall material used for self-healing bonding resin were prepared by interfacial polycondensation in miniemulsion. The ...Nanocapsules with triethylene glycol dimethacrylate （TEGDMA） as core material and polyurethane as wall material used for self-healing bonding resin were prepared by interfacial polycondensation in miniemulsion. The influence of surfactant and costabilizer concentration on nanocapsules size and stability of nanocapsules was investigated. The size and its polydispersity of the nanocapsules were measured by light-scattering particle size analyzer. When the concentration of SDS were increased from 2.5wt% to 10wt%,the size decreases from 340.5 nm to 258.3 nm, PDI decreased from 0.210 to 0.111. As the concentration of HD increased, the size and PDI were both decreased, When reaching 10wt%,the size was 258.0 nm,PDI was 0.130. SDS and HD play important effect in synthesis of Nanocapsules containing TEGDMA.By changing the surfactant and costabilizer concentration it was possible to synthesize a wide variety of nanocapsules sizes. The performance and technical parameters of nanocapsules had been researched preliminarily, which built the solid foundation for the application to the self-repairing bonding resin.展开更多
Raw natural gases usually contain water.It is very important to remove the water from these gases through dehydration processes due to economic reasons and safety considerations.One of the most important methods for w...Raw natural gases usually contain water.It is very important to remove the water from these gases through dehydration processes due to economic reasons and safety considerations.One of the most important methods for water removal from these gases is using dehydration units which use Triethylene glycol(TEG).The TEG concentration at which all water is removed and dew point characteristics of mixture are two important parameters,which should be taken into account in TEG dehydration system.Hence,developing a reliable and accurate model to predict the performance of such a system seems to be very important in gas engineering operations.This study highlights the use of intelligent modeling techniques such as Multilayer perceptron(MLP)and Radial Basis Function Neural Network(RBF-ANN)to predict the equilibrium water dew point in a stream of natural gas based on the TEG concentration of stream and contractor temperature.Literature data set used in this study covers temperatures from 10℃ to 80℃ and TEG concentrations from 90.000% to 99.999%.Results showed that both models are accurate in prediction of experimental data and the MLP model gives more accurate predictions compared to RBF model.展开更多
文摘Triethylene glycol monoethyl ether(CH_(3)CH_(2)O-(CH_(2)CH_(2)O)_(3)H,EtO(EO)_(3)H)is a valuable finechemical material.Its unique physical properties andchemical characteristics make it a major component ofthe super brake fluid for automobiles[1,2].In general,EtO(EO)_(3)H is synthesized from the ethoxylation re-action of ethanol with ethylene oxide(EO)in thepresence of the KOH catalyst.
基金Project supported by University Malaya and Ministry of Higher Education Malaysia under grant(KPT 1059-2012)Science Fund(SF019-2013)Fundamental Research Grant Scheme(FP033-2013B)
文摘Terbium-picrate triethylene glycol（EO3-Tb-Pic） complex was prepared in thin film and single layer device structure of ITO/EO3-Tb-Pic/Al, using spin coating technique. The UV-Vis absorption spectroscopy analysis was performed to evaluate the electronic molecular transition of the complex. The optical band gap, Eg estimated from the Tauc model revealed that EO3-Tb-Pic thin film exhibited a direct transition with Eg of 2.70 eV. The electronic parameters of the ITO/EO3-Tb-Pic/Al device such as the ideality factor n, barrier height Φb, saturation current Io, and series resistance Rs, were extracted from the conventional lnI-V, Cheung＇s functions and Norde＇s method. It was found that the evaluated parameters calculated from Norde＇s and Cheung＇s methods were consistent with those calculated from the conventional I-V method. In the double logarithmic I-V plot, three distinct regions based on the slope were identified, and the conduction mechanisms were discussed and explained. The mobility, μ value was estimated from SCLC region as 2.58×10^–7 cm2/（V·s）. This newly obtained lanthanide complex may be potentially utilized in electronic devices.
文摘Physical solvents such as ethylene glycol （EG）, diethylene glycol （DEG）, and triethylene glycol （TEG） are commonly used in wet gas dehydration processes with TEG being the most popular due to ease of regeneration and low solvent losses. Unfortunately, TEG absorbs significantly more hydrocarbons and acid gases than EG or DEG. Quantifying this amount of absorption is therefore critical in order to minimize hydrocarbon losses or to optimize hydrocarbon recovery depending on the objective of the process. In this article, a new correlation that fully covers the operating ranges of TEG dehydration units is developed in order to determine the solubility of light alkanes and acid gases in TEG solvent. The influence of several parameters on hydrocarbon and acid gas solubility including temperature, pressure, and solvent content is also examined.
基金Funded by Science and Technology Support Project of Sichuan Province(Nos.2014GZ0136 and 2015GZ0176)National Natural Science Foundation of China(No.51603134)
文摘A plasticizer triethylene glycol maleate（TEG-MA） was synthesized. The dominated monoester of moderate hydrophobicity with apparent oil-water partition coefficient of 0.042 in the product was confirmed by acid value determination, HPLC and FTIR. Its plasticizing effect on oxidized starch was manifested by crystallization, aging behaviour, moisture absorption, and mechanical performance. X-ray diffraction data showed that the relative crystallinity of the plasticized starch decreased. Both the crystal and the crystallinity of starch films were rarely changed in aging. Moisture absorption relied on the ester content and relative humidity. The elongation at break increased significantly with plasticizer content more than 10% in the matrix.
基金supported by the National Natural Science Foundation of China (21536003, 21776065 and 21978075)the Natural Science Foundation of Hunan Province in China (2019JJ20006)。
文摘The operation of dehydration is very important in the process of gas transportation. This study aims to evaluate the application feasibility of CO_(2) dehydration using triethylene glycol, which is also called TEG for short. Aspen Plus software was used to simulate the dehydration process system of CO_(2) gas transportation using TEG dehydration. Parameter analysis and process improvement were carried out for the simulation of dehydration process. At first, a sensitivity analysis was conducted to analyze and optimize operating conditions of conventional CO_(2)-TEG dehydration process system. Subsequently, a recycle unit was introduced into the conventional CO_(2)-TEG dehydration process system, it can be found that the improved process system with the recycle unit has a higher CO_(2) recovery rate which was about 9.8% than the conventional one. Moreover, the improved process system showed excellent operation stability through the comparison of simulation results of several processes with various water contents in their feed gases. Although the energy consumption is increased by about 2%, the improved process was economically and technically feasible for the long-term availability of CO_(2) pipeline transportation. The simulated results showed that the improved CO_(2)-TEG process system has promising application prospects in CO_(2) dehydration of CO_(2) gas transportation with high stability.
基金financial support from the Australian Postgraduate Award,Australia Research Council Discovery Projects(DP160102627 and DP1701048343)Shenzhen Peacock Plan of China(KQTD2016112915051055)+1 种基金111 Project(D20015)of China Three Gorges University,National Natural Science Foundation of China(Grant No.51902036)the Natural Science Foundation of Chongqing Science&Technology Commission(Grant No.cstc2019jcyj-msxm1407).
文摘A mechanically strong binder with polar functional groups could overcome the dilemma of the large volume change during charge/discharge processes and poor cyclability of lithium-sulfur batteries(LSBs).In this work,for the first time,we report the use of poly(thiourea triethylene glycol)(PTTG)as a multifunctional binder for sulfur cathodes to enhance the performance of LSBs.As expected,the PTTG binder facilitates the high performance and stability delivered by the Sulfur-PTTG cathode,including a higher reversible capacity of 825 mAh g^(-1) at 0.2 C after 80 cycles,a lower capacity fading(0.123%per cycle)over 350 cycles at 0.5 C,a higher areal capacity of 2.5 mAh cm^(-2) at 0.25 mA cm^(-2),and better rate capability of 587 mAh g^(-1) at 2 C.Such superior electrochemical performances could be attributed to PTTG's strong chemical adsorption towards polysulfides which may avoid the lithium polysulfide shuttle effect and excellent mechanical characteristics which prevents electrode collapse during cycling and allows the Sulfur-PTTG electrode to maintain robust electron and ion migration pathways for accelerated redox reaction kinetics.
基金financially supported by the Natural Science Foundation of Hebei Province of China(No.B2010000844)Research Foundation of Education Department of Hebei Province of China(No.ZH2012078)
文摘A triethylene glycol modified glassy carbon electrode （TEG-GCE） was fabricated by a controlled- potential electrolysis procedure. The performance of the film on the modified electrode surface was investigated by cyclic voltammetry with different probes. It was firstly found that while neutral pieces could penetrate the TEG film on the GCE surface, the ionic pieces, whatever it is anion or cation, was blocked by the film. This property was successfully used for determining dopamine （DA） in the presence of ascorbic acid （AA） with differential pulse voltammetry （DPV）.
基金funded by a project of the Ministry of Industry and Information Technology of the People's Republic of China(“Research on the key technology of treatment processes for high-flow offshore natural gas,”CJ09N20).
文摘Tall towers with large diameters on floating liquefied natural gas devices are highly sensitive to sway.If tower equipment is relatively high,swaying can easily cause uneven gaseliquid contact in the tower,inhibiting its absorption capacity.In this paper,gaseliquid counterflow triethylene glycol dehydration absorption towers are taken as the research object.A porous medium model was used to simplify the packing environment,and the EulereEuler method was used to simulate the flow field in the tower.The flow field encompasses the effects of the gaseliquid phase dispersion force,gaseliquid phase diffusion coefficient,and interphase mass transfer.By introducing a dynamic grid model to establish sway boundary conditions,we quantitatively examine the influence of sway duration and angle on gaseliquid flow and mass transfer performance in absorption towers.The results show that,when the sloshing angle of the absorption tower is 9°and the sloshing period is 20 s,the influence of the disturbance of the absorption tower's internal flow field is increased by 85%and 78%respectively compared with normal working conditions.When the sloshing angle of the absorption tower is 9°and the sloshing period exceeds 21 s,the gaseliquid mass transfer inside the absorption tower diminishes.When the sloshing period of the regeneration tower is 6 s and the sloshing angle reaches 20°,the mass fraction of poor ethylene glycol in the regeneration tower fluctuates significantly in the first sloshing cycle,and unqualified products appear.
基金Project supported by the Science and Technology Foundation of the National Defense Key Laboratory of Propellant and Explosive Combustion of China (No. 51455030101ZS3505).
文摘The thermal behavior and kinetic parameters of the decomposition reaction of triethylene glycol dinitrate (TEGDN) in a temperature-programmed mode at different pressures (0.1, 2, 4 and 6 MPa) have been investigated by means of DSC and TG-DTG. The results show that the properties of the thermal decomposition of TEGDN are affected by the change of pressure, and the kinetic model function, the apparent activation energy Ea and pre-exponential factor A of this reaction are []122(1)ln(1)aa---, 106.54 kJ昺ol-1 and 109.17 s-1 at 0.1 MPa, and 120.82 kJ昺ol-1 and 1010.56 s-1 at 2 MPa, respectively. The critical temperature of thermal explosion of TEGDN obtained by the values Teo and Tpo of the onset temperature Te and the peak temperature TP when the heat-ing rate tends to zero are 191.05, 209.86 ℃ at 0.1 MPa, 207.59 and 221.65 ℃ at 2 MPa, respectively.
文摘An inherent problem with natural gas production or transmission is the formation of gas hydrates, which can lead to safety hazards for production/transportation systems, and substantial economic risks. Hydrate inhibition with different inhibitors such as, methanol, ethylene glycol （EG）, triethylene glycol （TEG）, and sodium chloride solution continues to play a critical role in many operations. An understanding of when the hydrates form in the presence of these hydrate inhibitors, is therefore necessary to overcome hydrate problems. Several thermodynamic models have been proposed for predicting the hydrate formation conditions in aqueous solutions containing methanol/glycols and electrolytes. However, available models have limitations that include the types of liquid, compositions of fluids, and inhibitors used. The aim of this study is to develop a simple-to-use correlation for accurate prediction of hydrate-forming pressures of pure alkanes in the presence of different hydrate inhibitors, where the obtained results illustrate good agreement with the reported experimental data.
基金Funded by the National Natural Science Foundation of China (No.30672346)
文摘Nanocapsules with triethylene glycol dimethacrylate （TEGDMA） as core material and polyurethane as wall material used for self-healing bonding resin were prepared by interfacial polycondensation in miniemulsion. The influence of surfactant and costabilizer concentration on nanocapsules size and stability of nanocapsules was investigated. The size and its polydispersity of the nanocapsules were measured by light-scattering particle size analyzer. When the concentration of SDS were increased from 2.5wt% to 10wt%,the size decreases from 340.5 nm to 258.3 nm, PDI decreased from 0.210 to 0.111. As the concentration of HD increased, the size and PDI were both decreased, When reaching 10wt%,the size was 258.0 nm,PDI was 0.130. SDS and HD play important effect in synthesis of Nanocapsules containing TEGDMA.By changing the surfactant and costabilizer concentration it was possible to synthesize a wide variety of nanocapsules sizes. The performance and technical parameters of nanocapsules had been researched preliminarily, which built the solid foundation for the application to the self-repairing bonding resin.
文摘Raw natural gases usually contain water.It is very important to remove the water from these gases through dehydration processes due to economic reasons and safety considerations.One of the most important methods for water removal from these gases is using dehydration units which use Triethylene glycol(TEG).The TEG concentration at which all water is removed and dew point characteristics of mixture are two important parameters,which should be taken into account in TEG dehydration system.Hence,developing a reliable and accurate model to predict the performance of such a system seems to be very important in gas engineering operations.This study highlights the use of intelligent modeling techniques such as Multilayer perceptron(MLP)and Radial Basis Function Neural Network(RBF-ANN)to predict the equilibrium water dew point in a stream of natural gas based on the TEG concentration of stream and contractor temperature.Literature data set used in this study covers temperatures from 10℃ to 80℃ and TEG concentrations from 90.000% to 99.999%.Results showed that both models are accurate in prediction of experimental data and the MLP model gives more accurate predictions compared to RBF model.
