scholarly journals A modified random pore model for carbonation reaction of calcium oxide with carbon dioxide

2015 ◽  
Vol 69 (2) ◽  
pp. 209-217 ◽  
Author(s):  
Seyed Nouri ◽  
Habib Ebrahim ◽  
Bahram Nejad
Keyword(s):  
Carbon Dioxide ◽  
Calcium Oxide ◽  
Product Layer ◽  
Carbonation Reaction ◽  
Pore Model ◽  
Time Profiles ◽  
Rate Functions ◽  
Conversion Time ◽  
Reaction Constants ◽  
Random Pore Model

In this work, the random pore model was modified for a general concentration dependency and also bulk flow effect, in order to predict the carbonation reaction of calcium oxide with carbon dioxide. This reaction is one of the main methods for carbon dioxide capture from industrial flue gases. Different kinetic rate concentration functions were tested with the various literature experimental data for finding the best reaction constants and rate functions. Moreover, an exponential function for the diffusion of carbon dioxide through the product layer was proposed from the whole experimental conversion-time profiles.

A Comprehensive Kinetic Study of the SO2 Removal Reaction by Pure CuO with the Random Pore Model

2016 ◽  
Vol 41 (4) ◽  
pp. 385-397 ◽  
Author(s):  
Reza Bahrami ◽  
Habib Ale Ebrahim ◽  
Rouein Halladj ◽  
Ali Afshar
Keyword(s):  
Experimental Investigation ◽  
Mathematical Modelling ◽  
Product Layer ◽  
Solid Reaction ◽  
Pore Model ◽  
Time Profiles ◽  
So2 Removal ◽  
Partial Pressures ◽  
Conversion Time ◽  
Random Pore Model

An experimental investigation of the SO2 removal reaction by pure CuO was performed by thermogravimetry. In addition, mathematical modelling of this non-catalytic gas-solid reaction was performed using the random pore model. Modelling predictions of CuO conversion-time profiles at various temperatures and SO2 partial pressures compared well with the experimental results. The inherent rate constants and the product layer diffusivities were estimated between 400 and 600 °C.

scholarly journals Kinetic study of CO2 reaction with CaO by a modified random pore model

2016 ◽  
Vol 18 (1) ◽  
pp. 93-98 ◽  
Author(s):  
S.M.M. Nouri ◽  
H. Ale Ebrahim
Keyword(s):  
Mercury Porosimetry ◽  
Nitrogen Adsorption ◽  
Intrinsic Rate ◽  
Product Layer ◽  
Carbonation Reaction ◽  
Pore Model ◽  
Partial Pressures ◽  
Pore Size Distributions ◽  
Kinetics Of ◽  
Random Pore Model

Abstract In this work, a modified random pore model was developed to study the kinetics of the carbonation reaction of CaO. Pore size distributions of the CaO pellets were measured by nitrogen adsorption and mercury porosimetry methods. The experiments were carried out in a thermogravimeter at different isothermal temperatures and CO2 partial pressures. A fractional concentration dependency function showed the best accuracy for predicting the intrinsic rate of reaction. The activation energy was determined as 11 kcal/mole between 550–700°C. The effect of product layer formation was also taken into account by using the variable product layer diffusivity. Also, the model was successfully predicted the natural lime carbonation reaction data extracted from the literature.

Product Layer Diffusion during the Reaction of Calcium Oxide with Carbon Dioxide

1999 ◽  
Vol 13 (5) ◽  
pp. 999-1005 ◽  
Author(s):  
Derek Mess ◽  
Adel F. Sarofim ◽  
John P. Longwell
Keyword(s):  
Carbon Dioxide ◽  
Calcium Oxide ◽  
Product Layer

scholarly journals Kinetic Study of Low Temperature Sulfur Dioxide Removal Reaction By Sodium Carbonate Using Random Pore Model

2021 ◽  
Author(s):  
Iman Omidi ◽  
Habib Ale Ebrahim
Keyword(s):  
Low Temperature ◽  
Kinetic Study ◽  
Sodium Carbonate ◽  
Power Plants ◽  
Product Layer ◽  
Order Kinetic ◽  
Time Data ◽  
Pore Model ◽  
Model Predictions ◽  
Random Pore Model

Abstract An experimental investigation of low temperature SO2 removal by porous sodium carbonate was carried out by thermogravimetry. As well as, applied mathematical modeling based on the random pore model was employed to kinetic study of this reaction. The experiments were performed at various temperatures (100-250 oC) and different SO2 concentrations (0.13-1.12 vol%). The initial slopes procedure was used to determine dependency of the reaction rate constants versus temperature. First-order kinetic with respect to gaseous reactant was found and value of activation energy was attained as 22.5 kJ mol-1. Product layer diffusion coefficients were evaluated by the best fitting of experimental data with the model predictions. These random pore model predictions indicated good agreement with experimental conversion-time data at various conditions. The resulted kinetic parameters were avail abled for engineering calculations of SO2 abatement from the coal-based power plants by low-temperature flue gas desulfurization.

Determination of the intrinsic reactivities for carbon dioxide gasification of rice husk chars through using random pore model

2016 ◽  
Vol 218 ◽  
pp. 1073-1081 ◽  
Author(s):  
Xiaoyan Gao ◽  
Yaning Zhang ◽  
Bingxi Li ◽  
Yijun Zhao ◽  
Baocheng Jiang
Keyword(s):  
Carbon Dioxide ◽  
Rice Husk ◽  
Pore Model ◽  
Carbon Dioxide Gasification ◽  
Random Pore Model

scholarly journals Mineral carbonation process of carbon dioxide using animal bone

2021 ◽  
Vol 104 (2) ◽  
pp. 003685042110196
Author(s):  
Brendon Mpofu ◽  
Hembe E Mukaya ◽  
Diakanua B Nkazi
Keyword(s):  
Carbon Dioxide ◽  
Carbon Capture ◽  
Carbon Capture And Storage ◽  
Economic Feasibility ◽  
Mineral Carbonation ◽  
Agitation Rate ◽  
Carbonation Reaction ◽  
Carbonation Process ◽  
The Cost ◽  
Cow Bone

Carbon dioxide has been identified as one of the greenhouse gases responsible for global warming. Several carbon capture and storage technologies have been developed to mitigate the large quantities of carbon dioxide released into the atmosphere, but these are quite expensive and not easy to implement. Thus, this research analyses the technical and economic feasibility of using calcium leached from cow bone to capture and store carbon dioxide through the mineral carbonation process. The capturing process of carbon dioxide was successful using the proposed technique of leaching calcium from cow shinbone (the tibia) in the presence of HCl by reacting the calcium solution with gaseous carbon dioxide. AAS and XRF analysis were used to determine the concentration of calcium in leached solutions and the composition of calcium in cow bone respectively. The best leaching conditions were found to be 4 mole/L HCl and leaching time of 6 h. Under these conditions, a leaching efficiency of 91% and a calcium conversion of 83% in the carbonation reaction were obtained. Other factors such as carbonation time, agitation rate, and carbonation reaction temperature had little effect on the yield. A preliminary cost analysis showed that the cost to capture 1 ton of CO2 with the proposed technique is about US$ 268.32, which is in the acceptable range of the capturing process. However, the cost of material used and electricity should be reviewed to reduce the preliminary production cost.

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