丙酮-水-丙酮连氮体系汽液平衡测定与关联

Measurement and correlation of vapor-liquid equilibria for acetone-water-azine system

采用汽液双循环平衡釜,在常压(101.3 kPa)下测定了丙酮-丙酮连氮二元组分物系以及部分丙酮-水-丙酮连氮三元组分物系的汽液平衡数据。实验数据经Herington面积积分法检验符合热力学一致性。通过化工过程模拟软件,分别采用Wilson、NRTL、UNIQUAC活度系数模型对丙酮-丙酮连氮二元组分物系实验数据进行关联得到模型参数。并对汽液平衡的计算值与实验值进行比较,3种模型都吻合良好,其中由NRTL方程关联得到的计算结果最为适合,平均温度偏差和汽相组成偏差分别为0.0639 K和0.0048。从三元汽液相平衡数据中拟合出了丙酮-丙酮连氮、丙酮-水、水-丙酮连氮之间的NRTL方程相互作用参数。为验证数据及其二元相互作用参数的可靠性,利用关联出的丙酮-丙酮连氮模型参数计算出汽相组成与丙酮-丙酮连氮的二元数据比较,二者符合较好。实验和关联的结果为精馏分离丙酮-水-丙酮连氮汽液平衡体系提供了一定的基础数据。

Vapor-liquid equilibrium （VLE） data for acetone-azine binary system and parts of acetone water azine ternary system were determined in an Othmer equilibrium at atmospheric pressure （101.3 kPa）. The experimental data was verified by Herington method and were consistent with thermodynamics. The data of acetone-azine binary system were correlated with the NRTL,Wilson and UNIQUAC models by using chemical engineering analogue software. Respectively,all the models were correlated well with the VLE data. NRTL model produced best data,with the average deviations of temperature of 0.0639 K and vapor-phase mole fraction of methanol of 0.0048. The NRTL model was used to correlate the VLE data of the ternary system,and the interaction parameters of acetone-azine,water-azine,and acetone-water were obtained. In order to verify the reliability of the VLE data of the ternary system and these interacting binary parameters,the vapor compositions were calculated and compared with the corresponding experimental VLE data of acetone-azine binary system. The agreement between the calculated and experimental data was satisfactory. The experimental and correlative data could provide a basis for distillation separation of acetone-water-azine’s VLE system.