A rate equation for Ca(OH)2 and CO2 reaction in a spouted bed reactor at low gas concentrations

Haghnegahdar, Mohammad Reza; Rahimi, Amir; Hatamipour, Mohammad Sadegh

doi:10.1016/j.cherd.2010.10.019

Cited by 15 publications

(5 citation statements)

References 23 publications

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“…According to the coal mine safety system recomentation of emergency management interim provisions for the internal temperature and humidity in emergency safety facilities from China's work safety bureau, factors were selected in this experiment with five initial humidities (40%, 50%, 60%, 70%, and 80%) and five starting temperatures (24,26,28,30, and 32 °C), while thickness of soda lime was selected with the best properties at 8 cm and 30 W of fan power; the determination method of adsorption rate experiment is the same as mentioned before.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Alkali metal oxides (KO 2 , LiOH, and soda lime) have been widely used in adsorption for CO 2 in small- and medium-sized confined spaces in the case of electricity shortages or lacking space for a large adsorption bed. − LiOH can ensure that the static adsorption rate reaches 75.6% and 80.8% in 24 h, but it produces dust and is hard to mold and to realize large-scale promotion of products due to its higher cost. , KO 2 was used by developing oxygen candles, which can achieve the supply of oxygen and the removal of CO 2 ; however, the reaction process is too fast and hard to control, not suitable for long-term CO 2 adsorption. , …”

Section: Introductionmentioning

confidence: 99%

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Adsorption Properties of Modified Soda Lime for Carbon Dioxide Removal within the Closed Environment of a Coal Mine Refuge Chamber

Gai

Deng

2016

Ind. Eng. Chem. Res.

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In coal mine safety, providing and maintaining a safe closed environment and reducing the casualties of coal mine disasters are a longterm challenges. A novel and modified soda lime with higher adsorption rate and capacity was developed through analyzing the reaction mechanism and adsorption factors. The best combinations of soda lime with different mass fraction is additives 6%, H 2 O 12%, and NAOH 6%, while the best working modes is 25 W fan power, 8 cm thickness, and S-5 soda lime according to the multi-index orthogonal experiment. The order of influence for CO 2 adsorption rate of different compositions (mass fraction) is NaOH > H 2 O > Al 2 O 3 , and the order of influence in different working modes is fan power > thickness > the type of soda lime. Through the optimization design, the novel soda lime is easy to form without binding together in the process of adsorption for CO 2 and the dust outflow reduced by about 50%. The adsorption rate still remain at a high level in a high temperature and high humidity environment (humidity 70% and temperature 30 °C). It was demonstrated that the adsorption capacity increased by 28%, the adsorption rate increased by 32.2%, and the power consumption reduced by 33.3%.

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Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption Properties of Modified Soda Lime for Carbon Dioxide Removal within the Closed Environment of a Coal Mine Refuge Chamber

Gai

Deng

2016

Ind. Eng. Chem. Res.

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“…So using a shifting functionality for CO 2 concentration, the rate equation of reaction between CO 2 and Ca(OH) 2 in the semidry conditions was obtained as Eqs. (24) and (25) [38]. Fig.…”

Section: Study On the Validity Of Reaction Rate Equationmentioning

confidence: 94%

“…Details of calculations to present the modified equation for reaction of CO 2 and Ca(OH) 2 is presented elsewhere [38], but to clarify the procedure a brief explanation is presented here.…”

Section: Study On the Validity Of Reaction Rate Equationmentioning

confidence: 99%

Mathematical modeling of CO2 capture in a semi-dry spouted bed reactor

Haghnegahdar

Hatamipour

Rahimi

2011

Separation and Purification Technology

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“…1 Schematic sketch diagram of the experimental setup: (a) foam bed reactor and (b) ultrasonic-assisted semibatch stirrer reactor Reaction mechanism (wet carbonation)1. For the Ca(OH)2-CO2 aqueous system(Haghnegahdar et al 2011;Alamdari et al 2014) CO 2(g) → HCO 3(aq) −…”

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confidence: 99%

Synthesis and characterization of PCC from marble waste for its application in papermaking

Dhakad

Shrivastava

Agarwal³

2023

Preprint

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CaCl2 solution and Ca(OH)2 slurry, both prepared from marble waste (MARWAS), were carbonated with CO2 gas in the presence of CTAB, SDS, Teepol-610s, Triton-X, and Tween-80 as the surface modifiers in a semi-batch foam-bed reactor (FBR) to synthesize ultrafine or submicron PCC particles with enhanced hydrophobicity. Nano/ultrafine PPC particles with and without surfactant were also synthesized in a semi-batch stirrer reactor (SR) using CaCl2 solutions made from MARWAS and NH4HCO3 as the carbonating agent by single or simultaneous application of ultrasonication (US) and surfactant, respectively. The products were characterized by SEM, TEM, XRD, FTIR, and drop shape analyzer. In the presence of SDS in the FBR, distinct and smaller hydrophobic (water contact angle of 103.3o) vaterite particles (426 nm) could be produced using CaCl2 solution than those with the Ca(OH)2 slurry. However, in the SR, methanol was found to be more effective than the aqueous solvent in synthesizing needle-like aragonite nanoparticles (215.6 nm with L/D = 8.55) from CaCl2 solution without any use of US or surfactant. Handmade papers were manufactured using ground MARWAS powder, modified and unmodified PCC. The physical, mechanical, and optical properties of these filler-loaded papers were determined. The use of surface-modified and unmodified PCC was superior to the commercial PCC in increasing filler retention, burst strength, tear strength, brightness, and opacity of the paper hand sheets. Even the direct use of MARWAS powder was found to be more effective than GCC in enhancing the optical properties, although a slight decrease in the mechanical strength was observed.

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A rate equation for Ca(OH)2 and CO2 reaction in a spouted bed reactor at low gas concentrations

Cited by 15 publications

References 23 publications

Adsorption Properties of Modified Soda Lime for Carbon Dioxide Removal within the Closed Environment of a Coal Mine Refuge Chamber

Adsorption Properties of Modified Soda Lime for Carbon Dioxide Removal within the Closed Environment of a Coal Mine Refuge Chamber

Mathematical modeling of CO2 capture in a semi-dry spouted bed reactor

Synthesis and characterization of PCC from marble waste for its application in papermaking

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