The Experts below are selected from a list of 2484 Experts worldwide ranked by ideXlab platform
Alvin R Caparanga - One of the best experts on this subject based on the ideXlab platform.
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equilibrium solubility of carbon dioxide in 2 amino 2 methyl 1 propanol piperazine water
The Journal of Chemical Thermodynamics, 2010Co-Authors: Zihyi Yang, Allan N Soriano, Alvin R CaparangaAbstract:Abstract In this work, a new set of values for the solubility of carbon dioxide in aqueous mixture containing different concentrations of 2-amino-2-methyl-1-propanol (AMP), a sterically-Hindered Amine, and piperazine (PZ), an activator, are presented. The results were carefully determined using a 1.0 dm 3 stainless steel vapour-recirculation equilibrium cell at T = (313.2, 333.2, and 353.2) K, and pressures up to 152 kPa. The AMP concentrations in the ternary (solvent) mixture were (2 and 3) kmol · m −3 ; those of PZ’s were (0.5, 1.0, and 1.5) kmol · m −3 . The measured equilibrium loading (solubility)/partial pressure pairs at different temperatures and concentration levels were generally consistent with the corresponding values correlated from the Kent–Eisenberg model that has been adapted for the system in the study, where the parameters of the models were determined using the results from this study and relevant data from literature.
Xingrong Zeng - One of the best experts on this subject based on the ideXlab platform.
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thermal degradation and combustion behavior of novel intumescent flame retardant polypropylene with n alkoxy Hindered Amine
Journal of Analytical and Applied Pyrolysis, 2016Co-Authors: Xuejun Lai, Jiedong Qiu, Rimin Zhou, Huali Xie, Xingrong ZengAbstract:Abstract How to effectively improve the flame retardancy of polypropylene (PP) is one of the key problems needed to be resolved to promote its development and application. In this work, an efficient synergist—N-alkoxy Hindered Amine (NOR116) was combined with a novel intumescent flame retardant (IFR, i.e., ammonium polyphosphate/silicone-containing macromolecular charring agent) to flame-retard PP. The effects of NOR116 on the thermal degradation and combustion behavior of the PP/IFR composites were investigated. It was found that a small amount of NOR116 could effectively improve the flame retardancy and thermal stability of the composites. When the content of NOR116 was 0.3 wt%, the limiting oxygen index (LOI) value of the composite was increased from 35.0% to 42.5%, and the vertical burning (UL-94) test reached a V-0 rating. Meanwhile, the heat release rate (HRR), total heat release (THR), average mass loss rate (av-MLR) and smoke production rate (SPR) of the composite were also significantly reduced. Thermogravimetric analysis (TGA), Thermogravimetry-Fourier transform infrared spectrometry (TG-FTIR), scanning electron microscopy-energy dispersive X-ray spectrometry (SEM-EDXS) and Laser Raman Spectroscopy (LRS) results revealed that NOR116 could change the thermal degradation of the PP/IFR composites, and promote the charring performance of IFR at lower temperature and enhance the quantity and quality of the intumescent char at high temperature. The possible synergistic mechanism between NOR116 and IFR in PP was also discussed.
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effect and mechanism of n alkoxy Hindered Amine on the flame retardancy uv aging resistance and thermal degradation of intumescent flame retardant polypropylene
Polymer Degradation and Stability, 2015Co-Authors: Huali Xie, Xuejun Lai, Rimin Zhou, Xingrong Zeng, Yajun Zhang, Jianhua GuoAbstract:Abstract A multifunctional additive N-alkoxy Hindered Amine (NOR116) possessed free-radical quenching capability was combined with ammonium polyphosphate/pentaerythritol (APP/PER) to flame-retard polypropylene (PP). The effects of NOR116 on the flame retardancy, ultraviolet (UV) aging resistance and thermal degradation of the PP/APP/PER mixture were investigated by limiting oxygen index (LOI), vertical burning test (UL-94), cone calorimetric test (CCT), UV aging test and thermogravimetric analysis (TGA). It was found that NOR116 showed a synergistic effect with APP/PER in flame retardant PP. When the content of APP/PER and NOR116 were 24.5 wt% and 0.5 wt%, respectively, the LOI value of the PP/APP/PER mixture was increased from 31.0% to 35.0% and a UL-94 V-0 rating was achieved. Meanwhile, the UV aging resistance of the PP/APP/PER mixture was improved significantly. The synergistic mechanism between NOR116 and APP/PER was explored and revealed. During the combustion, NOR116 could not only block the radical chain reaction in the gas phase by quenching the active free-radicals, but also promote the formation of the thermostable intumescent char in the condensed phase.
Alan E Mather - One of the best experts on this subject based on the ideXlab platform.
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kinetics of the reaction of carbon dioxide with 2 amino 2 methyl 1 propanol solutions
Chemical Engineering Science, 1996Co-Authors: Yiwei Wang, Frederick D Otto, Alan E MatherAbstract:Abstract Reaction rate constants for the reaction between CO 2 and the sterically Hindered Amine, 2-amino-2-methyl-1-propanol (AMP), were determined from measurements of the rate of absorption of CO 2 into both aqueous and nonaqueous (1-propanol) AMP solutions. A stirred-cell reactor having a horizontal liquid-gas interface was used for the absorption studies. The zwitterion mechanism was found to be suitable for modelling the absorption of CO 2 into the aqueous AMP solutions and into the 1-propanol-AMP solvent. The partial order in Amine is greater than one for both cases. The kinetic parameters for aqueous AMP solutions were obtained for temperatures from 15 to 45°C and over the concentration range of 0.25–3.5 kmol m −3 of AMP.
Y E Qing - One of the best experts on this subject based on the ideXlab platform.
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regeneration of 2 amino 2 methyl 1 propanol used for carbon dioxide absorption
Journal of Environmental Sciences-china, 2008Co-Authors: Pei Zhang, Yao Shi, Jianwen Wei, Wei Zhao, Y E QingAbstract:To improve the e ciency of the carbon dioxide cycling process and to reduce the regeneration energy consumption, a sterically Hindered Amine of 2-amino-2-methyl-1- propranol (AMP) was investigated to determine its regeneration behavior as a CO2 absorbent. The CO2 absorption and Amine regeneration characteristics were experimentally exAmined under various operating conditions. The regeneration e ciency increased from 86.2% to 98.3% during the temperature range of 358 to 403 K. The most suitable regeneration temperature for AMP was 383 K, in this experiment condition, and the regeneration e ciency of absorption/regeneration runs descended from 98.3% to 94.0%. A number of heat-stable salts (HSS) could cause a reduction in CO2 absorption capacity and regeneration e ciency. The results indicated that aqueous AMP was easier to regenerate with less loss of absorption capacity than other Amines, such as, monoethanolAmine (MEA), diethanolAmine (DEA), diethylenetriAmine (DETA), and N-methyldiethanolAmine (MDEA).
Allan N Soriano - One of the best experts on this subject based on the ideXlab platform.
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equilibrium solubility of carbon dioxide in 2 amino 2 methyl 1 propanol piperazine water
The Journal of Chemical Thermodynamics, 2010Co-Authors: Zihyi Yang, Allan N Soriano, Alvin R CaparangaAbstract:Abstract In this work, a new set of values for the solubility of carbon dioxide in aqueous mixture containing different concentrations of 2-amino-2-methyl-1-propanol (AMP), a sterically-Hindered Amine, and piperazine (PZ), an activator, are presented. The results were carefully determined using a 1.0 dm 3 stainless steel vapour-recirculation equilibrium cell at T = (313.2, 333.2, and 353.2) K, and pressures up to 152 kPa. The AMP concentrations in the ternary (solvent) mixture were (2 and 3) kmol · m −3 ; those of PZ’s were (0.5, 1.0, and 1.5) kmol · m −3 . The measured equilibrium loading (solubility)/partial pressure pairs at different temperatures and concentration levels were generally consistent with the corresponding values correlated from the Kent–Eisenberg model that has been adapted for the system in the study, where the parameters of the models were determined using the results from this study and relevant data from literature.