盐酸催化蔗糖水解中反应速率常数和盐酸浓度等温关系式

The Isotemperature Equation between Reaction Rate Constant and Acid Concentration in Sucrose Hydrolysis Catalyzed by Hydrochloric Acid

酸催化水解蔗糖生产果葡糖浆要求在盐酸存在下蔗糖水解生成葡萄糖和果糖。盐酸的浓度和反应温度是影响蔗糖水解速率常数的最重要的两个因素。为了达到理想的恒温效果,本文对旋光仪组装了恒温系统;首次通过测定不同盐酸浓度条件下蔗糖水解速率常数拟合出盐酸浓度对蔗糖水解速率常数的新的等温式。实验证实,拟合所获得的等温式具有K=a0+a1CH++a2expCH+的形式,这个拟合公式比logK=Ka+log(d-c)-(5670/T)-pH文献公式氢离子浓度适用范围更大;比K=K0+KH+.CnH+文献公式对数据的拟合更好。

Under the condition that hydrochloric acid existed, the sucrose hydrolyzed and produced glucose and fructose. The concentration of the hydrochloric acid and the temperature of reaction are the two main factors that influence the reaction rate of sucrose hydrolysis. To keep isotemperature of the system, the polarimeter tube was installed constant temperature system and isotemperature result was satisfying. The rate constant under different concentrations of hydrochloric acid was measured and new isotemperature equation was obtained. It showed that the equation form is K = a0 ＋ a1 CH ＋ ＋ a2expCH ＋ and the calculation result by the equation which coincided well with experimental data is better than that of the formula K = K0 ＋ KH ＋ · CH^n ＋. This equation has larger application scope than the formula logK = Ka ＋ log （ d - c） - （5670/T）- pH.