Laboratory study on high-temperature adsorption of HCl by dry-injection of Ca(OH)2 in a dual-layer granular bed filter

Tan, Jianwei; Yang, Guohua; Mao, Jiayuan; Dai, Huichao

doi:10.1007/s11783-013-0618-9

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…The results reveal that the presence of CO 2 depresses the attainable maximum conversion at 650 ˚C and 700 ˚C, but CO 2 presence has no further effect on the 14 conversion degree at 800 ˚C. Studies on HCl bonding with other calcium-based sorbents also discovered that the presence CO 2 can lead to the lower chlorination conversion [37][38][39]. Besides, it is found that the result of conversion reduction is contrary to the behavior observed by Partanen et al [16] at 650 ˚C; however, the results are similar at above 800 ˚C.…”

Section: Effect Of Co 2 On the Chlorination Processes Of Caomentioning

confidence: 95%

Effect of CO2 on high temperature chlorination behavior of calcined limestone in an innovated fixed-bed reactor

Lin

Chyang

2016

Journal of the Taiwan Institute of Chemical Engineers

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This work aimed to elaborate on the influence of CO 2 on the reactivity of CaO with HCl under conditions similar to combustion environment. This study was conducted in an innovated fixed-bed reactor to investigate the influences of simulated CO 2 concentrations on the chemistry of CaO with HCl at varied temperatures. Tests of sole CaO carbonation and chlorination were performed in a thermogravimetric analyzer and fixed-bed reactor, respectively, to provide fundamental information for the CaO chlorination experiments in the presence of CO 2 . The HCl concentrations were continuously monitored in a Fourier Transform Infrared (FTIR) cell and the repeatability tests yielded good results. These results indicated that the presence of CO 2 was beneficial for the apparent reaction rates of CaO chlorination performed at 650 ˚C and 700 ˚C, compared with the case of only chlorination; nevertheless, this benefit accompanied a slight reduction of HCl capture capacity. The results were related to the CaO carbonation behavior. On the © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ 2 other hand, further increased CO 2 concentrations had no effect on the extent of the chlorination reaction.

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Section: Effect Of Co 2 On the Chlorination Processes Of Caomentioning

confidence: 95%

Effect of CO2 on high temperature chlorination behavior of calcined limestone in an innovated fixed-bed reactor

Lin

Chyang

2016

Journal of the Taiwan Institute of Chemical Engineers

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“…-Although the performance of alkaline earth-based sorbents is lower than that of alkali-based sorbents, they are significantly cheaper, and thus have attracted the attention of many researchers [22][23][24][25][26]. Slaked lime (Ca(OH) 2 ), limestone (CaCO 3 ) and quicklime (CaO) are the most commonly studied, which have been shown to strongly bind to HCl in temperature range of 500-600 °C [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Waste-Derived Inorganic Sorbents for the Removal of HCl in Syngas

Ephraim

Ngo

Minh

et al. 2018

Waste Biomass Valor

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Syngas production via the pyro-gasification of waste biomass is a promising means of managing waste while producing renewable fuel. However, such waste may contain a significant level of impurities such as chlorine, which may result in hydrogen chloride (HCl) being formed in the syngas produced. The presence of HCl gas may increase the risk of corrosion and may be harmful to health and to the environment. Consequently, stricter limits on HCl concentration in syngas are being imposed by environmental regulations and syngas end-use specifications, which is driving the search and development of more efficient and cost-effective methods of eliminating HCl. One such method is dry adsorption using inorganic sorbents. In literature, the majority of sorbents studied are based on commercialised products, and thus, there lack studies on the use of waste-derived sorbents for treating HCl in syngas. Therefore, this paper presents an experimental study on the adsorption potential of the solid waste sorbent, CCW-S, which is compared to that of the commercial sorbent, Bicar. Various physicochemical analyses were performed on the sorbents before and after the tests, including ICP, FTIR, XRD and TEM-EDX. The first set of adsorption tests were performed using a gas mixture of 500 ppm HCl in nitrogen (HCl/N 2 ) at ambient conditions (25 °C, 1 atm). The results revealed that Bicar was the better performing sorbent with an average breakthrough time of 66 h and a HCl adsorption capacity of 27 wt%, whereas the performance of CCW-S was lower (7.8 h and 4 wt%). Furthermore, TEM-EDX images of CCW-S particles show the participation of the impurities-Al, Fe, and Mg-in HCl capture. When the second set of adsorption tests were conducted with a simulated HCl/syngas atmosphere, a significant decrease in sorbent performance was observed, which showcases inhibitory interactions occurring between syngas and the sorbents, in relation to HCl adsorption. The results of this preliminary investigation reveal a promising opportunity to valorize industrial residues as cheap and efficient sorbents for the removal of HCl in syngas. This will enable a wider market penetrating of waste-derived syngas, while meeting the quality requirements of increasingly strict environmental regulations and end-use devices.

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A review of hydrogen chloride removal from calcium- and sodium-based sorbents

Wang

Chen

et al. 2023

Environ Sci Pollut Res

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Laboratory study on high-temperature adsorption of HCl by dry-injection of Ca(OH)2 in a dual-layer granular bed filter

Cited by 9 publications

References 27 publications

Effect of CO2 on high temperature chlorination behavior of calcined limestone in an innovated fixed-bed reactor

Effect of CO2 on high temperature chlorination behavior of calcined limestone in an innovated fixed-bed reactor

Valorization of Waste-Derived Inorganic Sorbents for the Removal of HCl in Syngas

A review of hydrogen chloride removal from calcium- and sodium-based sorbents

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