The Experts below are selected from a list of 831 Experts worldwide ranked by ideXlab platform
Weigang Lin - One of the best experts on this subject based on the ideXlab platform.
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process simulation of mineral Carbonation of phosphogypsum with ammonia under increased co2 pressure
Journal of CO 2 Utilization, 2017Co-Authors: Weijun Bao, Hongtao Zhao, Huiquan Li, Songgeng Li, Weigang LinAbstract:Abstract The mineral Carbonation of phosphogypsum offers many advantages in sequestering CO2, solving the pollution problem of phosphogypsum stacking, and manufacturing high value-added chemical products with low energy consumption and cost. Using the Aspen Plus process simulation software, this work simulates a novel process for the mineral Carbonation of phosphogypsum with ammonia under increased CO2 pressure. This process is divided into five sections, namely, pre-Carbonation, enhanced Carbonation, flash separation, gas phase absorption, and (NH4)2SO4 fertilizer production. With its large-scale application, this new process allows the sensitivity analysis of many operation conditions, identifies the optimal conditions for reducing the ammonia and energy consumption of (NH4)2SO4 fertilizer production, and achieves a high Carbonation conversion with a Fast reaction rate. The optimal conditions (6 bar enhanced Carbonation pressure, 1 bar flash pressure, 38 °C ammonia absorption solution temperature, 1.05 ammonia excess ratio, 1.024 CO2 excess ratio, and 0.94 mass ratio of water to gypsum) yield the highest Carbonation conversion, ammonia utilization ratio, and enhanced Carbonation temperature of 99.9%, 95.2%, and 138.5 °C, respectively, all of which can help achieve a Fast Carbonation reaction rate.
O. Brissaud - One of the best experts on this subject based on the ideXlab platform.
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In situ kinetic measurements of gas–solid Carbonation of Ca(OH)2 by using an infrared microscope coupled to a reaction cell
Chemical Engineering Journal, 2010Co-Authors: G. Montes-hernandez, A. Pommerol, F. Renard, P. Beck, E. Quirico, O. BrissaudAbstract:Gas–solid Carbonation experiments were carried out by using an infrared microscope coupled to a reaction cell. The hydroxide ions (OH) consumption and the production of molecular water (H2O) and carbonate (CO32−) vibration bands were directly monitored as a function of time. Herein, we demonstrated that the gas–solid Carbonation of calcium hydroxide (or portlandite) was exclusively activated by initial adsorbed water-molecules (water activity ≈ 0.6 in the lab room) at low temperature (30 °C) and low CO2 pressure (0.5–1.5 bar). We assume that Carbonation reaction was then rapidly autocatalysed by the water production and followed by a passivation step due to the formation of a dense layer of carbonate around the reacting particles of portlandite. The Fast Carbonation and passivation steps were satisfactory fitted by using a kinetic pseudo-second-order model. Moreover, the infrared measurements provided complementary insights with relevance to the reaction mechanism of gas–solid Carbonation of calcium hydroxide. Herein, the formation of metastable aragonite was identified and a hydrated calcium carbonate was suspected during Carbonation process. On the other hand, when initial adsorbed water onto reacting particles was removed by in situ vacuum drying (P < 10−5 mbar, T = 110 °C) prior to injection of CO2 in the reaction cell (water activity ≈ 0), the Carbonation of calcium hydroxide particles was no more detected by infrared spectroscopy at low temperature (30 °C). However, there was evidence for a very limited Carbonation reaction at higher temperature (300 °C) and low CO2 pressure (
Weijun Bao - One of the best experts on this subject based on the ideXlab platform.
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process simulation of mineral Carbonation of phosphogypsum with ammonia under increased co2 pressure
Journal of CO 2 Utilization, 2017Co-Authors: Weijun Bao, Hongtao Zhao, Huiquan Li, Songgeng Li, Weigang LinAbstract:Abstract The mineral Carbonation of phosphogypsum offers many advantages in sequestering CO2, solving the pollution problem of phosphogypsum stacking, and manufacturing high value-added chemical products with low energy consumption and cost. Using the Aspen Plus process simulation software, this work simulates a novel process for the mineral Carbonation of phosphogypsum with ammonia under increased CO2 pressure. This process is divided into five sections, namely, pre-Carbonation, enhanced Carbonation, flash separation, gas phase absorption, and (NH4)2SO4 fertilizer production. With its large-scale application, this new process allows the sensitivity analysis of many operation conditions, identifies the optimal conditions for reducing the ammonia and energy consumption of (NH4)2SO4 fertilizer production, and achieves a high Carbonation conversion with a Fast reaction rate. The optimal conditions (6 bar enhanced Carbonation pressure, 1 bar flash pressure, 38 °C ammonia absorption solution temperature, 1.05 ammonia excess ratio, 1.024 CO2 excess ratio, and 0.94 mass ratio of water to gypsum) yield the highest Carbonation conversion, ammonia utilization ratio, and enhanced Carbonation temperature of 99.9%, 95.2%, and 138.5 °C, respectively, all of which can help achieve a Fast Carbonation reaction rate.
G. Montes-hernandez - One of the best experts on this subject based on the ideXlab platform.
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In situ kinetic measurements of gas–solid Carbonation of Ca(OH)2 by using an infrared microscope coupled to a reaction cell
Chemical Engineering Journal, 2010Co-Authors: G. Montes-hernandez, A. Pommerol, F. Renard, P. Beck, E. Quirico, O. BrissaudAbstract:Gas–solid Carbonation experiments were carried out by using an infrared microscope coupled to a reaction cell. The hydroxide ions (OH) consumption and the production of molecular water (H2O) and carbonate (CO32−) vibration bands were directly monitored as a function of time. Herein, we demonstrated that the gas–solid Carbonation of calcium hydroxide (or portlandite) was exclusively activated by initial adsorbed water-molecules (water activity ≈ 0.6 in the lab room) at low temperature (30 °C) and low CO2 pressure (0.5–1.5 bar). We assume that Carbonation reaction was then rapidly autocatalysed by the water production and followed by a passivation step due to the formation of a dense layer of carbonate around the reacting particles of portlandite. The Fast Carbonation and passivation steps were satisfactory fitted by using a kinetic pseudo-second-order model. Moreover, the infrared measurements provided complementary insights with relevance to the reaction mechanism of gas–solid Carbonation of calcium hydroxide. Herein, the formation of metastable aragonite was identified and a hydrated calcium carbonate was suspected during Carbonation process. On the other hand, when initial adsorbed water onto reacting particles was removed by in situ vacuum drying (P < 10−5 mbar, T = 110 °C) prior to injection of CO2 in the reaction cell (water activity ≈ 0), the Carbonation of calcium hydroxide particles was no more detected by infrared spectroscopy at low temperature (30 °C). However, there was evidence for a very limited Carbonation reaction at higher temperature (300 °C) and low CO2 pressure (
Hongtao Zhao - One of the best experts on this subject based on the ideXlab platform.
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process simulation of mineral Carbonation of phosphogypsum with ammonia under increased co2 pressure
Journal of CO 2 Utilization, 2017Co-Authors: Weijun Bao, Hongtao Zhao, Huiquan Li, Songgeng Li, Weigang LinAbstract:Abstract The mineral Carbonation of phosphogypsum offers many advantages in sequestering CO2, solving the pollution problem of phosphogypsum stacking, and manufacturing high value-added chemical products with low energy consumption and cost. Using the Aspen Plus process simulation software, this work simulates a novel process for the mineral Carbonation of phosphogypsum with ammonia under increased CO2 pressure. This process is divided into five sections, namely, pre-Carbonation, enhanced Carbonation, flash separation, gas phase absorption, and (NH4)2SO4 fertilizer production. With its large-scale application, this new process allows the sensitivity analysis of many operation conditions, identifies the optimal conditions for reducing the ammonia and energy consumption of (NH4)2SO4 fertilizer production, and achieves a high Carbonation conversion with a Fast reaction rate. The optimal conditions (6 bar enhanced Carbonation pressure, 1 bar flash pressure, 38 °C ammonia absorption solution temperature, 1.05 ammonia excess ratio, 1.024 CO2 excess ratio, and 0.94 mass ratio of water to gypsum) yield the highest Carbonation conversion, ammonia utilization ratio, and enhanced Carbonation temperature of 99.9%, 95.2%, and 138.5 °C, respectively, all of which can help achieve a Fast Carbonation reaction rate.