CIESC Journal ›› 2020, Vol. 71 ›› Issue (S1): 7-14.DOI: 10.11949/0438-1157.20190440

• Thermodynamics • Previous Articles     Next Articles

Vapor-liquid equilibrium for methanol-formaldehyde-polyoxymethylene dimethyl ethers ternary system

Pan LI(),Hui KONG,Zhuodong SONG,Zuoyi ZHANG,Yunfang WANG()   

  1. College of Chemical Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
  • Received:2019-04-26 Revised:2019-07-28 Online:2020-04-25 Published:2020-04-25
  • Contact: Yunfang WANG

甲醇-甲醛-聚甲氧基二甲醚三元体系汽液平衡

李攀(),孔慧,宋卓栋,张作毅,王云芳()   

  1. 中国石油大学(华东)化学工程学院,山东 青岛 266580
  • 通讯作者: 王云芳
  • 作者简介:李攀(1992—),男,硕士研究生,ustblipan@163.com
  • 基金资助:
    国家重点研发计划项目(2018YFB06044800)

Abstract:

Polyoxymethylene dimethyl ether (PODEn) is a kind of compound with high oxygen content,which is developing to be a high quality diesel additive in recent years.At a constant pressure of 101.3 kPa, the vapor-liquid equilibrium data of methanol-formaldehyde-PODE2 ternary system was determined using the improved vapor-liquid equilibrium double cycle Rose kettle.Based on maximum-likelihood method,the measured ternary vapor-liquid equilibrium data were correlated by NRTL, Wilson, and UNIQUAC activity coefficient model with Aspen Plus software.And the corresponding binary interaction parameters and simulated calculation values of the three models are obtained respectively. By comparing the calculation value of three models with experimental value, the average absolute deviation in boiling point and vapor-phase composition were determined,which were less than 1.10 K, 0.0250 and 0.0240, respectively.The correlation results of the three models are applicable to the system, and the obtained binary interaction parameters can be applied to the distillation design of the methanol-formaldehyde-PODE2 ternary system, laying a data foundation for the industrial separation optimization of the related matter system.

Key words: methanol, formaldehyde, PODE2, vapor-liquid equilibrium, thermodynamic model

摘要:

聚甲氧基二甲醚(PODEn)是一种含氧量较高的化合物,近年来更是发展为一种优质的柴油添加剂。在101.3 kPa恒定压力下,使用改进的汽液平衡双循环Rose釜测定了甲醇-甲醛-PODE2三元体系汽液平衡数据。运用最大似然原理,在Aspen Plus软件中,分别采用NRTL、Wilson以及UNIQUAC三种活度系数模型对测定的三元汽液平衡数据进行回归,分别得到三个模型所对应的二元交互参数以及模拟计算值。通过对比模拟值与实验值,得到温度和气相组成的平均绝对偏差,分别小于1.10 K、0.0250和0.0240。三个模型的关联结果均适用于此体系,得到的二元交互参数能够应用于甲醇-甲醛-PODE2三元体系的精馏设计,为相关物系的工业分离优化奠定了数据基础。

关键词: 甲醇, 甲醛, PODE2, 汽液平衡, 热力学模型

CLC Number: