Frontiers of Chemical Science and Engineering >
Reaction kinetics of CaC2 formation from powder and compressed feeds
Received date: 18 Mar 2016
Accepted date: 16 Jun 2016
Published date: 29 Nov 2016
Copyright
The production of CaC2 from coke/lime powders and compressed powder pellets are low cost and fast processes. A number of studies have reported the reaction kinetics of these reactions but they are still not well understood and the proposed kinetic models are not comparable due to differences in the reaction conditions. Therefore the reaction behavior of CaO/C powders (0.074 mm) and cubes (5 mm × 5 mm × (4.6–5.1) mm) compressed from a mixture of powders have been studied using thermal gravimetric analysis (TGA) at 1700– 1850 °C. Kinetic models were obtained from the TGA data using isoconversional and model-fitting methods. The reaction rates for the compressed feeds were lower than those for the powder feeds. This is due to the reduced surface area of the compressed samples which inhibits heat transfer from the surrounding environment (or the heating source) to the sample. The compression pressure had little influence on the reaction rate. The reaction kinetics of both the powder and the compressed feeds can be described by the contracting volume model f(α) = 3(1−α)2/3, where α is the conversion rate of reactant. The apparent activation energy and pre-exponential factor of the powder feed were estimated to 346–354 kJ∙mol−1 and 5.9 × 107 min−1, respectively, whereas those of the compressed feed were 305–327 kJ∙mol−1 and 3.6 × 106 min−1, respectively.
Key words: calcium carbide; kinetic model; activation energy; pre-exponential factor
Renxing Wang , Zhenyu Liu , Leiming Ji , Xiaojin Guo , Xi Lin , Junfei Wu , Qingya Liu . Reaction kinetics of CaC2 formation from powder and compressed feeds[J]. Frontiers of Chemical Science and Engineering, 2016 , 10(4) : 517 -525 . DOI: 10.1007/s11705-016-1585-z
1 |
Holzrichter K, Knott A, Mertschenk B, Salzinger J. Ullmann’s Encyclopedia of Industrial Chemistry: Calcium Carbide. New York: John Wiley & Sons, Inc., 2000, 1–14
|
2 |
Matake R, Adachi Y, Matsubara H. Synthesis of vinyl ethers of alcohols using calcium carbide under superbasic catalytic conditions (KOH/DMSO). Green Chemistry, 2016, 18(9): 2614–2618
|
3 |
Rodygin K S, Werner G, Kucherov F A, Ananikov V P. Calcium carbide: A unique reagent for organic synthesis and nanotechnology. Chemistry–an Asian Journal, 2016, 11(7): 965–976
|
4 |
Lin Z, Yu D, Sum Y N, Zhang Y. Synthesis of functional acetylene derivatives from calcium carbide. ChemSusChem, 2012, 5(4): 625–628
|
5 |
Shi D, Qiao K, Yan Z. Effect of potassium carbonate on catalytic synthesis of calcium carbide at moderate temperature. Frontiers of Chemical Science and Engineering, 2011, 5(3): 372–375
|
6 |
Li G, Liu Q, Liu Z, Zhang Z, Li C, Wu W. Production of calcium carbide from fine biochars. Angewandte Chemie International Edition, 2010, 49(45): 8480–8483
|
7 |
Mu J J, Hard R A. A rotary kiln process for making calcium carbide. Industrial & Engineering Chemistry Research, 1987, 26(10): 2063–2069
|
8 |
Mukaibo T, Yamanaka Y. Calcium carbide. III. Kinetics of the first stage of the reaction of producing calcium carbide under reduced pressure(2–3 mmHg). Journal of the Society of Chemical Industry (Japan), 1953, 56(5): 313–314
|
9 |
Tagawa H, Sugawara H. The kinetics of the formation of calcium carbide in a solid-solid reaction. Bulletin of the Chemical Society of Japan, 1962, 35(8): 1276–1279
|
10 |
Brookes C, Gall C, Hudgins R. A model for the formation of calcium carbide in solid pellets. Canadian Journal of Chemical Engineering, 1975, 53(5): 527–535
|
11 |
Torikai N, Nagaishi T, Saito S, Miyamoto G. Reaction between calcium oxide and graphite. Bulletin of the Faculty of Engineering, Yokohama National University, 1967, 16: 21–28
|
12 |
El-Naas M H. Synthesis of calcium carbide in a plasma spout fluid bed. Dissertation for the Doctoral Degree. Montreal: McGill University, 1996, 135–139
|
13 |
Li G, Liu Q, Liu Z. Kinetic behaviors of CaC2 production from coke and CaO. Industrial & Engineering Chemistry Research, 2013, 52(16): 5587–5592
|
14 |
Rowan S L, Celik I B, Escobar Vargas J A, Pakalapati S R, Targett M. Reaction kinetics modeling of CaC2 formation from coal and lime. Industrial & Engineering Chemistry Research, 2014, 53(8): 2963–2975
|
15 |
Li G, Liu Q, Liu Z. CaC2 Production from pulverized coke and CaO at low temperatures—reaction mechanisms. Industrial & Engineering Chemistry Research, 2012, 51(33): 10742–10747
|
16 |
Vyazovkin S, Wight C A. Model-free and model-fitting approaches to kinetic analysis of isothermal and nonisothermal data. Thermochimica Acta, 1999, 340-341: 53–68
|
17 |
Khawam A, Flanagan D R. Role of isoconversional methods in varying activation energies of solid-state kinetics: I. Isothermal kinetic studies. Thermochimica Acta, 2005, 429(1): 93–102
|
18 |
Müller M B. Structure, properties and reactions of CaO in burnt lime. Part 3. Composite reactions of CaO and C in solid and liquid state. Scandinavian Journal of Metallurgy, 1990, 19(5): 210–217
|
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