多升温速率等温法的动力学分析在一水草酸钙脱水反应中的应用(英文)

Thermal Analysis Kinetics Studies on the Dehydration of Calcium Oxalate Monohydrate

用一种新的方法求算热分析动力学的三因子 :(1)用迭代的等转化率法求出较为可靠的 Ea;(2 )用多升温速率等温法判定出可能的机理函数 ,并在 Ea和的基础上计算出 A.用该法对一水草酸钙 (Ca C2 O4· H2 O)脱水反应的热分析动力学三因子进行研究 ,得出其对应的机理函数的方程为 ;f (a) =n(1-a) 1- 1/n;Ea为 82 .83 k J· mol- 1;A为 1.14 2× 10 5～ 1.2 3 5× 10 5s-

The thermal kinetics of dehydration for calcium oxalate monohydrate is studied by DSC technique. A new multiple rate iso-temperature method is appl ied to determine the kinetic model. A iterative iso-temperature procedure is u sed to estimate apparent activation energy E a; the pre-exponential factor A was obtained on the basis of E a and g(α). using this method, it is determined that the kinetic model of calcium oxalate monohydrate is f(α)=n(1-α) 1-1/n , apparent activation energy E a is 82.83 k J/mol, pre-exponential factor A is 1.142×10 5~1.235× 10 5 s -1 .