共查询到19条相似文献,搜索用时 78 毫秒
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乙烯-甲苯等温汽液平衡数据的测定 总被引:1,自引:1,他引:0
自行设计了高压汽液平衡数据的测定装置,实现汽液两相在线气相色谱分析。在压力0.305~2.036MPa、温度303.15,333.15,363.15K的条件下,测定了乙烯-甲苯二组分物系的汽液平衡数据。汽液平衡数据满足热力学一致性检验。由实验数据对乙烯-甲苯二组分物系的汽相采用Peng-Robinson方程、液相采用NRTL方程进行关联,得到NRTL方程的二元交互作用参数。乙烯-甲苯二组分物系的汽液平衡数据的计算值与实验值的平均偏差为3.14%,最大偏差为10.68%。 相似文献
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在293.04,312.93,332.90,352.70K下,用改进的静态法汽液平衡装置测量了二甲醚-异丙醚二组分物系的汽液平衡数据。实验结果表明,在汽相和液相中二甲醚含量在同一温度下随压力的升高而增加,在同一压力下随温度的升高而减小,低温、高压有利于二甲醚在异丙醚中的溶解。选用PR方程对实验数据进行了关联,拟合得到了PR方程的二元交互作用参数kij(kij=-0.013)。汽液平衡数据的实验值与PR方程的计算值的最大偏差分别为-0.006和-0.011,平均绝对偏差分别为0.003和0.004,表明PR方程能够很好地描述二甲醚-异丙醚二组分物系在实验温度和压力下的相平衡行为。 相似文献
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含盐汽液平衡数据的关联 总被引:5,自引:0,他引:5
在评述各种盐效应研究的基础上,修正了佐田的拟二元模型和荒井的拟二元模型,提出两种含盐汽液平衡数据的关联方法,分别针对盐与其中一种组份的作用绝对占优和盐与两种组份的作用相差不大的溶液;计算了氯化钙浓度恒定下,乙酸甲酯-甲醇、乙酸乙酯-甲醇、乙酸乙酯-乙醇、丙酮-甲醇、甲醇-乙醇和异丙醇-水等六个体系以及醋酸钾浓度恒定下异丙醇-水体系共十二套等压汽液平衡数据;关联结果与文献值比较,绝对平均偏差,汽相组成(|Δy|)为0.0073—0.0290,泡点温度(|ΔT|)为0.00—0.97℃,证明这两种关联方法简单、方便,可用于工程设计。 相似文献
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应用UNIFAC-FV模型对PET-EG-H2O系统的汽液平衡进行了关联,并与Raoult定律的计算结果进行了比较,表明UNIFAC-FV模型更接近实际情况。将该模型应用于酯化反应器,得出的结果与实际生产数据能较好地吻合,解决了酯化反应器汽液平衡只能估算的问题。 相似文献
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用循环式平衡釜测定了常压下环丙胺-甲醇二元体系的汽液平衡,所测定的数据满足热力学一致性。用NRTL活度系数模型关联了所测定的数据,计算值与测定值吻合。 相似文献
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《中国炼油与石油化工》2012,14(1):80-86
In this work,ethylene glycol monomethylether(EE) was chosen as an entrainer for the azeotropic distillation of 1,3,5-trimethylbenzene+1-methyl-2-ethylbenzene system to investigate the influence of the entrainer on vapor liquid equilibrium(VLE) of this system.Three sets of binary VLE data in the system consisting of EE + 1,3,5-trimethylbenzene +1-methyl-2-ethylbenzene were measured using the Dvorak-Boublik still.The binary parameters of NRTL model were correlated by using the likelihood method.The ternary VLE data of the system were measured as well and were predicted by using the binary parameters of NRTL model.The test results indicated that the binary data passed the thermodynamic consistency tests,and the difference between the predicted values of ternary VLE and the experimental data reached the research standard for VLE data.Addition of EE had a great influence on the relative volatility between 1,3,5-trimethylbenzene and 1-methl-2-ethyl-benzene:when the ratio of solvent was 4,and the relative volatility between 1,3,5-trimethylbenzene and 1-methyl-2-ethylbenzene increased from 1.0125(without solvent addition) to 1.283. 相似文献
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提出以水-非电解质-电解质三元系Gibbs-Duhem方程为基础的含盐汽液平衡关联式。其中电解质在混合溶剂中的活度系数在Pitzer模型基础上采用微扰法得到,仅有一个微扰系数作为可调参数由试验拟合。在无盐汽液平衡基础上利用该关联式可由盐的浓度计算盐对汽液平衡的影响。与常用的虚拟二元模型相比,本文方法具有理论严格、使用方便的优点 相似文献
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乙酸乙酯-乙醇-1-辛基-3-甲基咪唑四氟硼酸盐物系汽液平衡数据的测定 总被引:4,自引:4,他引:0
在101.32 kPa下,用改进的Othmer汽液平衡釜测定了乙酸乙酯-乙醇-1-辛基-3-甲基咪唑四氟硼酸盐([omim]BF_4)三组分物系的等压汽液相平衡数据。采用NRTL方程对实验数据进行了关联,得到方程参数,活度系数的计算值与实验值的偏差为3.12%。实验结果表明,加入[omim]BF_4使汽液平衡线偏离乙酸乙酯-乙醇二组分物系的汽液平衡线,[omim]BF_4含量越大,偏离程度越大;[omim]BF_4具有明显的盐析效应,能够增大乙酸乙酯对乙醇的相对挥发度;当x([omim]BF_4)为10%时,乙酸乙酯-乙醇物系的共沸点消失,随[omim]BF_4含量的增加,乙酸乙酯对乙醇的相对挥发度增加。 相似文献
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Fu Jiquan 《中国炼油与石油化工》2008,(2):35-44
Binary vapor liquid equilibrium (VLE) data were measured for the systems of 2-propanol/ ethanediol and ethanediol/potassium acetate (KAc). VLE data for the system of propanol/ethanediol was tested using thermodynamic consistency test. The average values of Ayj and A P were 0.0776 and 0.1542 kPa, respectively. The above two sets of VLE data were correlated with the NRTL model. Ternary VLE data for the system of 2-propanol/water/KAc was used to obtain the more suitable parameters of NRTL model for binary systems of 2-propanol/KAc and water/KAc (called TDCM). For multicomponent systems, ternary and quaternary, the VLE values predicted by the NRTL model agreed well with the literature data. Influence of KAc, ethanediol, and the mixture of KAc and ethanediol on volatility between 2- propanol and water was investigated respectively. The results showed that the above-mentioned materials and mixture had different influence on volatility between 2-propanol and water. The method for correlation and prediction of salt-containing VLE is simple and effective for the said system. 相似文献
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