26.67kPa下醋酸-水-N-甲基吡咯烷酮体系汽液相平衡的研究  

Vapor-Liquid Equilibria of Acetic Acid-Water-N-Methylpyrrolidone System at 26.67 kPa

作　　者：平丽娟[1] 彭勇[1] 毛建卫[1] 

机构地区：[1]浙江科技学院浙江省农产品化学与生物加工技术重点实验室,浙江杭州310023

出　　处：《高校化学工程学报》2011年第4期554-558,共5页Journal of Chemical Engineering of Chinese Universities

基　　金：浙江省科技计划项目(2006c31037)

摘　　要：在26.67 kPa下,采用改进的Rose汽液相平衡釜测定醋酸-N-甲基吡咯烷酮、水-N-甲基吡咯烷酮、醋酸-水-N-甲基吡咯烷酮的等压汽液相平衡数据。实验数据通过了Herington面积法和点检验法的热力学一致性检验。考虑醋酸在汽相中的缔合效应,以"化学"理论和Hayden-O’Connell(HOC)方法为基础,采用NRTL模型关联水-醋酸、醋酸-N-甲基吡咯烷酮、水-N-甲基吡咯烷酮体系的汽液平衡数据,得到相应的二元体系模型参数和关联偏差。用关联的二元体系NRTL模型参数,推算出醋酸-水-N-甲基吡咯烷酮三元体系的汽液相平衡数据,温度平均偏差绝对值为1.36 K,水汽相摩尔分数的平均偏差绝对值为0.0102,醋酸汽相摩尔分数的平均偏差绝对值为0.0072。The isobaric vapour-liquid equilibrium（VLE） data of two binary systems（acetic acid-N-methylpyrrolidone（NMP）system and water-NMP system） and a ternary system（acetic acid-water-NMP） were measured at the pressure of 26.6 kPa by using an improved Rose equilibrium still,and the VLE data of water-acidic acid system from literature were applied.The thermodynamic consistency of the obtained VLE data was examined by the Herington area test and the point to point method.The association of acetic acid in vapour phase was considered,and the nonideality of the vapour phase was corrected by the chemical theory and Hayden-O’connell method.Moreover,the VLE data of above three binary systems were correlated by the NRTL model,the deviation of the correlation and the model parameters for above binary systems were obtained.Then the obtained NRTL model parameters were used to predict the VLE data of the mentioned ternary system,and it was found that the temperature average absolute deviation of the prediction is 1.36 K and the average absolute deviations in vapour-phase mole fraction of water and acetic acid are 0.0102 and 0.0072,respectively.

关 键 词：醋酸 N-甲基吡咯烷酮(NMP) 水 汽液相平衡(VLE) 

分 类 号：TQ013.1[化学工程] O642.42[理学—物理化学]