A Semiempirical Kinetic Model for Dissolution of Colemanite in Aqueous CH3COOH Solutions

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• 作者：Cengiz &Ouml ; zmetin ; M. Muhtar Kocakerim ; Sinan Yapici ; and Ahmet Yarta//pubs.acs.org/images/entities/scedil.gif" border="0">i
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：1996
• 出版时间：July 1996
• 年：1996
• 卷：35
• 期：7
• 页码：2355 - 2359
• 全文大小：98K
• 年卷期：v.35,no.7(July 1996)
• ISSN：1520-5045

文摘

In this study the dissolution of Colemanite in aqueous acetic acidsolutions was investigated ina batch reactor employing the parameters of particle size,solid-to-liquid ratio, and temperature.It was found that the dissolution rate increases with increasingtemperature and decreasingsolid-to-liquid ratio and particle size. The most effectiveparameter was particle size with apower of -1.420 after temperature and solid-to-liquid had less effectthan the other parameters.The conversion rate increased up to 3.365 M acid concentration andthen decreased withincreasing acid concentration. No important effect of stirringspeed was observed. The activationenergy of the process was determined to be 51.490 kJmol^-1. It was determined by graphicaland statistical methods that the reaction fits a model in the form of-ln(1 - X) = kt. Thefollowing semiempirical mathematical model, which expresses the processwell, was established: -ln(1 - X) =56 664(D)^-1.42(S/L)^-0.270exp(-6193.0/T)t, where Xis the conversion fraction,D the particle size, S/L, thesolid-to-liquid ratio, and T the reactiontemperature.