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Paper Information

Journal:   JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TABRIZ)   FALL 2006 , Volume 33 , Number 2 (44 MECHANICAL ENG.); Page(s) 21 To 31.
 
Paper: 

KINETIC MODELING OF MELAMINE SYNTHESIS FROM UREA IN FIXED BED REACTOR

 
 
Author(s):  FARSHI A., TORABI ANGAJI M.
 
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Abstract: 
Melamine is industrially produced from urea. Therefore the kinetic inspection of the relevant reaction seems to be important to the end of accessing a suitable model and design of the catalyzed bed reactor for synthesizing Melamine. The kinetics of the mentioned reaction has not been found in the literature review. A fixed bed reactor with injection solid urea was constructed to inspect the relevant reaction kinetics. Urea is changed into Melamine, CO2 & NH3 at the presence of silica gel catalyst and the temperature of 400°C. The designed experiments were performed at the temperatures 370, 380 & 390°C based on the catalyst weight varying with the molar flow rate of the entering urea [W/FA0 (kgcat/ (grmole/hr)] An equation pointing out the variance of the vv MJ conversion factor according to the ratio W/FA° was reported which followed the patent: XA=a (W/ FA°)b. Based on the mentioned equations above, at each temperature, the reaction rate conforming the concentration of the outlet urea was reported r¢A =k ( CA). The mean reaction order at these three temperatures equaled to n=0.4.
The functionality of k conforming T turned out to be an Arrhenius function (k = k0e – E/RT). The activation Kcal energy and the frequency content are 2.212  kcal/grmol and 75.4 respectively.
 
Keyword(s): MELAMINE, KINETICS, UREA, FIXED BED EXPERIMENTAL, MODEL
 
References: 
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