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    • 3. 发明授权
    • 이온성 액체를 이용한 IS 싸이클 공정의 혼합가스로부터순수 이산화황의 분리 회수 방법
    • 在具有离子液体的循环中从气体混合物中分离和回收纯二氧化硫的方法
    • KR100831093B1
    • 2008-05-22
    • KR1020070034777
    • 2007-04-09
    • 한국과학기술연구원
    • 김창수공경택유계상이병권정광덕김홍곤안병성주오심
    • C01B17/56C01B17/50
    • C01B17/56B01D53/1481B01D53/1493C01B13/0229C01B13/0285C01B2210/0071Y02E60/36Y02P20/542
    • A method is provided to separate and recover pure SO2 only from a gas mixture generated from an IS(Iodine-Sulfur) cycle process even at a high temperature in a stable and succeeding manner through absorption and degassing processes using ionic liquid, and prevent loss of a solvent even in the repeated absorption and degassing processes by maintaining low vapor pressure and high temperature stability as compared with a conventional amine-based absorbent. As a method for separating and recovering sulfur dioxide from a gas mixture containing 40 to 80 wt.% of sulfur dioxide(SO2) and 20 to 60 wt.% of oxygen exhausted from an IS(Iodine-Sulfur) cycle process consisting of a decomposition reaction of sulfuric acid, a decomposition reaction of sulfur dioxide, and a decomposition reaction of iodic acid, a method for separating and recovering pure sulfur dioxide from the gas mixture in the IS cycle process using ionic liquid comprises the steps of: contacting the gas mixture with ionic liquid to allow the ionic liquid to absorb and separate sulfur dioxide(SO2) in the gas mixture in a temperature range of 20 to 50 deg.C; and degassing the sulfur dioxide that has been absorbed and separated from the gas mixture from the ionic liquid in a temperature range of 120 to 250 deg.C. The ionic liquid is ionically bonded compounds in which cations selected from imidazolium, pyrrolidinium, piperidinium, morpholinium and pyridinium are bonded with anions selected from hydrogen sulfate(HOSO3^-), methyl sulfate(CH3OSO3^-), ethyl sulfate(C2H6OSO3^-)methane sulfonate(CH3SO3^-), acetate(CH3COO^-), tetrafluoroborate(BF4^-), hexafluorophosphate(PF6^-), and chloride(Cl^-), or mixtures of the ionically bonded compounds. Further, the recovered sulfur dioxide has a recovery rate of 85 to 95% and purity of 98 to 99%.
    • 提供了一种仅通过IS(碘 - 硫)循环过程产生的气体混合物分离和回收纯SO2的方法,即使在高温下以稳定和后续的方式通过使用离子液体的吸收和脱气方法也可以分离和回收纯SO2,并防止 与常规的胺类吸收剂相比,通过保持低蒸气压和高温稳定性,即使在反复吸收和脱气过程中也是这样。 作为从含有40〜80重量%的二氧化硫(SO 2)和20〜60重量%的由分解的(碘 - 硫)循环过程中排出的氧气的气体混合物中分离和回收二氧化硫的方法, 硫酸的反应,二氧化硫的分解反应和碘酸的分解反应,使用离子液体在IS循环过程中从气体混合物中分离和回收纯二氧化硫的方法包括以下步骤:使气体混合物 使离子液体允许离子液体在20至50℃的温度范围内吸收和分离气体混合物中的二氧化硫(SO 2); 并且在120至250℃的温度范围内,从气体混合物中吸收和分离的二氧化硫从离子液体脱气。 离子液体是离子键合的化合物,其中选自咪唑鎓,吡咯烷鎓,哌啶鎓,吗啉鎓和吡啶鎓的阳离子与阴离子选自硫酸氢盐(HOSO 3 - ),甲基硫酸盐(CH 3 OSO 3 - ),乙基硫酸盐(C 2 H 6 OSO 3 - )) 甲磺酸盐(CH 3 SO 3 - ),乙酸盐(CH 3 COO - ) - 四氟硼酸盐(BF 4 - ),六氟磷酸盐(PF 6 - )和氯化物(Cl - ))或离子键合化合物的混合物。 此外,回收的二氧化硫的回收率为85〜95%,纯度为98〜99%。