CAJ | 학술논문

在101.32 kPa下,用改进的Othmer釜测定了含离子液体1-丁基-3-甲基四氟硼酸咪唑盐([BMIM]BF)的异丁醇-水物系的等压汽液平衡数据.实验结果表明,当[BMIM]BF_4的摩尔分数为10%时异丁醇-水二组分物系的汽液平衡线就开始偏离,[BMIM]BF_4摩尔分数为20%,30%时,偏离程度越大;[BMIM]BF_4表现出盐效应,使异丁醇对水的相对挥发度发生改变,消除了异丁醇-水物系的共沸点;[BMIM]BF_4含量越大,盐效应越明显,随着[BMlM]BF_4含量的增加,异丁醇对水的相对挥发度也随着增加.[BMIM]BF_4可以做为异丁醇-水物系萃取精馏分离的有机盐,适宜的[BMIM]BF_4摩尔分数为20%.
재101.32 kPa하,용개진적Othmer부측정료함리자액체1-정기-3-갑기사불붕산미서염([BMIM]BF)적이정순-수물계적등압기액평형수거.실험결과표명,당[BMIM]BF_4적마이분수위10%시이정순-수이조분물계적기액평형선취개시편리,[BMIM]BF_4마이분수위20%,30%시,편리정도월대;[BMIM]BF_4표현출염효응,사이정순대수적상대휘발도발생개변,소제료이정순-수물계적공비점;[BMIM]BF_4함량월대,염효응월명현,수착[BMlM]BF_4함량적증가,이정순대수적상대휘발도야수착증가.[BMIM]BF_4가이주위이정순-수물계췌취정류분리적유궤염,괄의적[BMIM]BF_4마이분수위20%.
Isobaric vapor-liquid equilibrium data for the isobutanol-water system containing the ionic liquid(IL) 1-butyl-3-methylimidazolium tetrafluoroborate([BMIM]BF_4)were measured in a modified Othmer still at 101.32 KPa.The vapor-liquid equilibrium curve for the isobutanol-water with added IL deviates from that of the binary system when the mole fraction of [BMIM] BF_4 reaches 10%.When the mole fraction of[BMIM]BF_4 is 20% or 30%,the deviation is greater.The IL shows a salt effect,which increases the volatility of isobutanol relative to that of water,and even leads to the disappearance of the azeotropic point.Increasing addition of[BMIM]BF_4 results in the salt effect becoming more distinct,and the volatility of isobutanol relative to water increases.As a result,it is concluded that [BMIM] BF_4 can be employed as a salt in the extractive distillation of the isobutanol-water system.The optimum mole fraction of [BMIM]BF_4 is about 20%,and the VLE data obtained allow the design of the process to be optimized.