Moisture transport and adsorption on silica gel–calcium chloride composite adsorbents

Zhang, X.J.; Qiu, Liang

doi:10.1016/j.enconman.2006.04.001

Cited by 68 publications

(24 citation statements)

References 13 publications

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“…The Brunauer, Emmelt, and Teller (BET) a two-parameter isotherm, the Guggenheim, Anderson, and de Boer (GAB), a three-parameter isotherm and the Frenkel, Halsey, and Hill (FHH model) are the most common models. It is reported that the GAB model covers a wider range of water activity up to 0.9, while the BET model covers only up to 0.4 of water activity Dehydration of Ethanol-Water Azeotropic Mixture (28). Thus, the GAB and the FHH model have been applied to the experimental results of this work for water sorption on impregnated phillipsite adsorbents.…”

Section: Equilibrium Isotherms For Water Sorption On Impregnated Adsomentioning

confidence: 98%

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Dehydration of Ethanol-Water Azeotropic Mixture by Adsorption Through Phillipsite Packed-Column

Al‐Asheh

Banat

Fara

2009

Separation Science and Technology

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Phillipsite is a natural zeolite material available in several locations in Jordan. Phillipsite with and without treatment was used for dehydrating ethanol in the adsorptive distillation process. Molecular sieves 4A was taken as a reference material. According to the breakthrough curves phillipsite treated with 1 M calcium chloride solution gave the best performance. The water uptake using the 1 M-phillipsite was 0.1054 g H 2 O=g adsorbent while the water uptake using the 4A molecular sieves was 0.1030 g H 2 O=g adsorbent. The Guggenheim, Anderson, and De Boer (GAB) model and the Frenkel, Halsey, and Hill (FHH) model were used to represent the isotherms for water sorption on the adsorbents used. The GAB model fit the experimental data relatively better than the FHH model for all cases, except for the case of using 2 M-phillipsite. Using the Crank diffusion model the effective diffusivity of water vapor in raw phillipsite is 10.40 Â 10 À8 mm 2 s À1 while it is 6.9 Â 10 À8 mm 2 s À1 in the 1 M treated phillipsite.

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Section: Equilibrium Isotherms For Water Sorption On Impregnated Adsomentioning

confidence: 98%

“…The products of both C and K represent an energy constant equivalent to the energy constant of BET model, C BET (28). The GAB model has some advantages over the BET model.…”

Section: Gab Modelmentioning

confidence: 99%

Dehydration of Ethanol-Water Azeotropic Mixture by Adsorption Through Phillipsite Packed-Column

Al‐Asheh

Banat

Fara

2009

Separation Science and Technology

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“…Ni [15] carried out using a constant-pressure thermal gravimetrical apparatus to measure the apparent solid-side mass diffusivity of water vapor adsorbed in a regular-density silica gel, expressed as a function of temperature and moisture content. Zhang [16] performed a measurement of moisture uptake curves in silica gel-calcium composite adsorbents by using the thermal gravimetrical method and showed that the sorption rate was highest for non-impregnated microporous silica gel. Sayılgan [17] researched that the effect of regeneration temperature on adsorption equilibria and mass diffusivity of the zeolite 13X-water pair.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Composite Adsorbent 13X/CaCl2 on an Adsorption Cooling System

et al. 2017

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Featured Application: The study is mainly used in areas where water is scarce, adsorbents adsorb water from the air, and are then desorbed.Abstract: A new experimental device which tests the adsorption performance of the 13X/CaCl 2 composite adsorbent under vacuum conditions was established. In this device, heat transfer characteristics in the adsorbent bed have a great influence on the adsorbent performance, the temperature of the bottom outside bed is very close to the temperature of the bottom inside bed and the temperature difference between them at the end of heating and cooling are 5.66 • C and 0.303 • C, respectively. The following conclusions could be drawn: the equilibrium water uptake of composite adsorbent CA10X (zeolite 13X impregnated with 10 wt % CaCl 2 solution) was increased 5.7% compared with that of 13X, and the water uptake was 0.37 g/g. The composite adsorbent CA10X has a better performance in the adsorption refrigeration system.

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“…It was demonstrated that these materials could be regenerated at between 70 and 120 • C Tokarev et al 2002;Dawoud and Aristov 2003). Moreover, the composite desiccant materials especially made from calcium chloride and macroporous silica gel, which mean pore diameter is 4.8 nm and porosity is 0.7, have been suggested by Zhang et al (2005Zhang et al ( , 2006 Zhang and Qiu (2007) and Jia et al (2006aJia et al ( , 2006bJia et al ( , 2007. They resulted in a better adsorption performance compared with normal silica gel.…”

Section: Introductionmentioning

confidence: 99%

Improvement of water vapor adsorption ability of natural mesoporous material by impregnating with chloride salts for development of a new desiccant filter

et al. 2011

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The aim of this study is the development of a new adsorbent for the desiccant material which can be regenerated by the domestic exhaust heat by using natural mesoporous material, Wakkanai siliceous shale. To improve this shale's performance to adsorb/desorb the water vapor, lithium chloride, calcium chloride or sodium chloride was supported into the mesopores by impregnating with each chloride solution. Especially sodium chloride was effective to increase the water vapor adsorption amount 5-7 times of that of natural shale in the relative humidity range from 50 to 70%. Moreover, the appropriate impregnating concentrations were determined as 5wt% from the relationship between the maximum water vapor adsorption amount and the mesopore volume. Based on these results, a new desiccant filter has been developed by impregnated original paper with lithium chloride and sodium chloride. This paper contained shale powder in the synthetic fibers. The dehumidification performance of this filter was evaluated under the simulated summer condition in Tokyo. From the cyclic adsorption/regeneration test, this shale and chlorides filter could adsorb and desorb 60 g/h water vapor repeatedly at the regeneration temperature of 40°C. On the other hand, a silica gel filter and a zeolite filter adsorbed and desorbed only 10 g/h and 25 g/h, respectively. These results suggested that the shale impregnated with the chlorides has the best dehumidification ability as a new desiccant material. Further, the desiccant filter made from the shale will achieve the effective use of the low temperature exhaust heat.

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Moisture transport and adsorption on silica gel–calcium chloride composite adsorbents

Cited by 68 publications

References 13 publications

Dehydration of Ethanol-Water Azeotropic Mixture by Adsorption Through Phillipsite Packed-Column

Dehydration of Ethanol-Water Azeotropic Mixture by Adsorption Through Phillipsite Packed-Column

Experimental Investigations of Composite Adsorbent 13X/CaCl2 on an Adsorption Cooling System

Improvement of water vapor adsorption ability of natural mesoporous material by impregnating with chloride salts for development of a new desiccant filter

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