新型络合剂的合成及其络合铁脱硫工艺研究

采用氯磺酸磺化法合成了一种含有磺酸基和羧基的新型络合剂磺化戊二酸（SG），用SG与乙二胺四乙酸、柠檬酸、FeCl3配制出一种三元络合铁脱硫体系。在连续脱硫装置中考察脱硫液与硫化氢气体体积比、装置运行时间、填料高度等脱硫工艺条件对复配脱硫体系脱硫效率的影响，在再生装置中考察空气流量、再生时间、再生温度等再生工艺条件对复配脱硫体系再生率的影响。结果表明：在脱硫液与硫化氢气体体积比为0.134、填料高度为0.4 m、脱硫温度为40 ℃、初始pH为 8.0的条件下，原料气中的H2S质量浓度可由227.679 g/m3降到0.011 g/m3，脱除率达99.99%；在空气流量为125 L/h、再生时间为30 min、温度为30 ℃、初始pH为8.0的条件下，脱硫剂的再生率达93.24%。

SYNTHESIS AND DESULFURIZATION PROCESS WITH CHELATED IRON OF NEW COMPLEXING AGENT

A new complexing agent SG containing sulfonic group and carboxylic group is synthesized using chlorosulfonic acid and glutaric acid. The ternary complex iron desulfurization system is prepared with SG, EDTA, citric acid and Fe3+. In a continuous desulfurization device, the effect of liquid to feed gas ratio, running time and filler height on the desulfurization efficiency of the ternary system is studied. The effect of air flow rate, regeneration time and temperature on the regeneration for the ternary system is also investigated. The optimum desulfurization conditions are approached as follows: the liquid/feed gas ratio of 0.134, the packing height of 0.4 m, the temperature of 40℃ and pH of 8.0. In this case, the H2S content of the feed gas is reduced from 227.679 g/m3 to 0.011 g/m3, the removal rate is up to 99.99%. The regeneration rate is up to 93.24% at the optimum regeneration conditions: the air flow of 125 L/h, the regeneration time of 30 min, the regeneration temperature of 30 ℃ and pH of 8.0.