摘要
本研究采用FeCl3·6H2O、ZnCl2和环丁砜(TMS)复配形成的Fe/Zn-TMS体系脱除催化裂化(FCC)干气中的H2S,并用30%H2O2氧化再生Fe/Zn-TMS体系.同时,研究了各活性成分比例、吸收液体积浓度、吸收液pH值等对脱硫效率的影响,以及H2O2用量、吸收富液pH值对Fe2+氧化率的影响.结果表明,n(FeCl3·6H2O)∶n(ZnCl2)∶n(TMS)为0.45∶0.55∶1,吸收液pH为0.75,体积浓度(W)为50%的条件下能长时间高效脱硫,最高脱硫率达99.9%;在n(Fe2+)∶n(H2O2)为2∶1,吸收富液pH为0.65的条件下,Fe2+氧化率达96.7%.体系可循环使用3次,且能耗低、操作简单.
Fe /Zn-TMS( tetramethylene sulfone) system,which was consisted of FeCl3·6H2O,ZnCl2and TMS and regenerated with 30% H2O2,were used for adsorption removal of H2S from fluid catalytic cracking( FCC) dry gas. The effects of percentage of each active ingredient,volume concentration and pH value of the absorbing liquid on H2S removal were evaluated,and the impacts of H2O2dosage and pH value in the concentrate on oxidation rate of Fe2+were also examined. Results showed that maximum H2S removal rate of 99. 9% was achieved and maintained for a long time at n( FeCl3·6H2O)∶n( ZnCl2) ∶n( TMS) = 0.45∶0.55∶1,absorption solution pH of0.75,and volume concentration( W) of50%. The oxidation rate of Fe2+reached 96. 7%at n( Fe2+) ∶n( H2O2) = 2∶1 and concentrate pH of0.65. The absorbent could be reused for3 times while maintaining high removal performance,with low energy consumption and easy operation.
出处
《环境科学学报》
CAS
CSCD
北大核心
2014年第8期1942-1948,共7页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.51278464)~~
