Abstract
To solve the problem of swelling and agglomeration of CaCl2 during the process of ammonia adsorption and improve the performance of mass transfer, we present a new method for the preparation of adsorbent. The CaCl2 is first immerged into sawdust by soaking method, then the composite adsorbent is prepared by carbonizing the mixture of CaCl2 and sawdust. The SEM image and elements analysis indicated that the new adsorbent has high porosity and uniform distribution of CaCl2 due to carbonization under temperature of 700°C. The performance testing of ammonia adsorption showed that under the conditions of evaporation temperature of −5°C and condensation temperature of 40°C, the ammonia uptake reaches 0.204, 0.253 and 0.285 kg/kg, the specific cooling power (SCP) is 868.96, 540.02 and 405.16 W/kg, and the average adsorption rate is 6.79×10−4, 4.22×10−4 and 3.17×10−4 kg/kg/s when the adsorption time is 5, 10 and 15 min, respectively. The problems of swelling and agglomeration of CaCl2 are solved.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.Avoid common mistakes on your manuscript.
References
Chen H, Cui Q, Tang Y, et al. Attapulgite based LiCl composite adsorbents for cooling and air conditioning applications. Appl Therm Eng, 2008, 28: 2187–2193
Aristov Y I, Restuccia G, Cacciola G, et al. A family of new working materials for solid sorption air conditioning systems. Appl Therm Eng, 2002, 22: 191–204
Wang G Q, Lin Y, Wu F, et al. Preparation of composite adsorbent for adsorption refrigeration by soaking in solution. J Beijing Inst Technol, 2005, 25: 919–922
Cui Q, Lu H J, Zhu Y K, et al. Adsorption performance of composite adsorbent for adsorption refrigeration. J Chem Ind Eng, 2005, 56: 1860–1864
Cui Q, Chen H J, Yao H Q. Preparation and adsorption mechanism of composite adsorbents on solar powered adsorption refrigeration. Acta Energ Sol Sinica, 2004, 25: 182–188
Wang K, Wu J Y, Wang R Z, et al. Composite adsorbent of CaCl2 and expanded graphite for adsorption ice maker on fishing boats. Int J Refrig, 2006, 29: 199–210
Wang L W, Wang R Z, Wu J Y, et al. The adsorption character of CaCl2-NH3 and application in refrigeration. Sci China Ser E-Tech Sci, 2004, 34: 268–279
Daou K, Wang R Z, Xia Z Z, et al. Experimental comparison of the sorption and refrigerating performances of a CaCl2 impregnated composite adsorbent and those of the host silica gel. Int J Refrig, 2007, 30: 68–75
Zhang X J, Qiu L M. Moisture transport and adsorption on silica gel-calcium chloride composite adsorbents. Energy Convers Manag, 2007, 48: 320–326
Tokarev M, Gordeeva L, Romannikov V, et al. New composite sorbent CaCl2 in mesopores for sorption cooling heating. Int J Therm Sci, 2002, 41: 470–474
Zhu D, Wu H, Wang S. Experimental study on composite silica gel supported CaCl2 sorbent for low grade heat storage. Int J Therm Sci, 2006, 45: 804–813
Daou K, Wang R Z, Xia Z Z. Development of a new synthesized adsorbent for refrigeration and air conditioning applications. Appl Therm Eng, 2006, 26: 56–65
Daou K, Wang R Z, Xia Z Z, et al. Theoretical comparison of the refrigerating performances of a CaCl2 impregnated composite adsorbent to those of the host silica gel. Int J Therm Sci, 2008, 47: 68–75
Rosas J M, Bedia J, Rodríguez-Mirasol J. On the preparation and characterization of chars and activated carbons from orange skin. Fuel Process Technol, 2010, 91: 1345–1354
El Qada E N, Allen S J, Walker G M. Influence of preparation conditions on the characteristics of activated carbons produced in laboratory and pilot scale systems. Chem Eng J, 2008, 142: 1–13
Li W, Yang K, Peng J. Effects of carbonization temperatures on characteristics of porosity in coconut shell chars and activated carbons derived from carbonized coconut shell chars. Ind Crop Prod, 2008, 28: 190–198
Ould-Idriss A, Stitou M, Cuerda-Correa E M. Preparation of activated carbons from olive-tree wood revisited. II. Physical activation with air. Fuel Process Technol, 2011, 92: 266–270
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Bu, X., Wang, L., Li, H. et al. Preparation of composite adsorbent of sawdust and CaCl2 by carbonization method for creating pore. Sci. China Technol. Sci. 55, 2404–2408 (2012). https://doi.org/10.1007/s11431-012-4923-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11431-012-4923-5