R1234ze(E)在多元醇脂油中溶解度的实验研究

R1234ze(E)(1,1,1,3-四氟丙烯)是当下具有较强替代潜能的环保制冷剂之一。本文搭建了溶解度测试实验系统,对R1234ze(E)在两种多元醇脂油中的溶解度进行测试,测试的温度范围为40～80℃,压力范围为0.123～0.360 MPa。采用PR状态方程和MHV2混合规则及NRTL活度系数模型对实验结果进行关联计算,得到不同温度下的交互系数及计算值与实验值的平均相对误差。结果表明:R1234ze(E)在两种多元醇脂油中的溶解度均随着温度的升高而降低,且R1234ze(E)在两种多元醇脂油中的平衡压力与溶解度之间存在立方函数关系。在两种多元醇酯油中,计算值与实验值的平均相对误差分别为1.68%和1.11%,可较好的描述R1234ze(E)在两种多元醇酯油中的相平衡行为。

Experimental Study on the Solubility of R1234ze(E) in Polyol Ester Oils

R1234ze(E)(1,1,1,3-tetrafluoropropene) is extremely environmental-friendly and is currently considered as one of the alternative refrigerants. In this paper, the solubility of R1234ze(E) in two polyol ester oils was measured at temperatures ranging from 40 °C to 80 °C and pressures ranging from 0.123 MPa to 0.360 MPa. Additionally, the experimental data was correlated using the PR equation of state with MHV2 mixing rules and the NRTL activity coefficient model to calculate the interaction coefficient at different temperatures. Furthermore, the average absolute relative deviation between calculated value and experimental data was calculated. The results indicated that the solubility of R1234ze(E) in two polyol ester oils decreased as temperature increased. Additionally, a numerical calculation model for the equilibrium pressure and solubility was proposed using a cubic function with acceptable accuracy. In the two polyol ester oils, the deviations between calculated value and experimental data were 1.68% and 1.11% respectively. Thus, the results can better describe the phase equilibrium behavior of R1234ze (E) in the two polyol ester oils.