碱式硫酸铝脱硫富液热解吸反应动力学

Reaction kinetics of thermal desorption of basic aluminum sulfate desulfurization rich liquid

在静态解吸体系下,采用初始速率法对碱式硫酸铝(碱铝)脱硫富液进行了解吸本征动力学研究,求解得到了碱铝脱硫富液解吸反应速率方程。结果表明:解吸温度对解吸率的影响较为显著,最大瞬时解吸速率均出现在解吸反应初始时刻。在实验参量调控范围内,S(Ⅳ)浓度提高使解吸速率相对提高平均为1.9倍,解吸率最高增长了25.2%;降低pH使解吸速率相对提高平均为0.2倍,解吸率最高增长14.3%;当恒定解吸温度从333 K升高至363 K时,解吸速率相对提高平均为1.1倍,解吸率最高增长38.1%。脱硫富液解吸适宜的亚硫酸根浓度为0.1044 mol/L以上,pH值为3.25左右,解吸温度为343 K以上。解吸速率与亚硫酸根浓度成1.86±0.14级反应,与氢离子浓度成0.38±0.03级反应;解吸反应活化能为(41.4±0.2)kJ/mol,指前因子为(1383324.2±0.5)L 1.24/(mol 1.24·min)。研究结果为碱铝解吸法脱硫的基础理论提供可靠的数据支撑。

Under the static desorption system,the desorption intrinsic reaction kinetics of basic aluminum sulfate(aluminum base)desulfurization rich liquid were studied by the initial rate method.The desorption reaction rate equation of aluminum base desulfurization rich liquid was solved.The results show that the effect of desorption temperature on the desorption rate is significant,the maximum instantaneous desorption rate appears at the initial time of desorption reaction.Within the range of experimental parameters,with the concentration of S(Ⅳ)increaseing,the desorption rate relatively increases by an average of 1.9 times,and the highest desorption ratio increases by 25.2%.With pH decreasing,the desorption rate relatively increases by an average of 0.2 times,and the highest desorption ratio increases by 14.3%.When the constant desorption temperature increases from 333 K to 363 K,the desorption rate relatively increases by an average of 1.1 times,and the highest desorption ratio increases by 38.1%.For desorption of desulfurization rich liquid,the suitable sulfite concentration is above 0.1044 mol/L,pH is about 3.25,and the desorption temperature is above 343 K.The desorption rate of aluminum base desulfurization rich liquid has a 1.86±0.14 order reaction with sulfite concentration,and a 0.38±0.03 order reaction with hydrogen ion concentration.The activation energy of aluminum base desorption reaction is(41.4±0.2)kJ/mol,and the pre-exponential factor is(1383324.2±0.5)L 1.24/(mol 1.24·min).The research results provide reliable data support for the basic theory of aluminum base desorption desulfurization.