Random Packing Modelling under High Pressure for Gas-Liquid Systems

• Main Author: Jerzy Mackowiak
• Format: Article
• Language: English
• Published: AIDIC Servizi S.r.l. 2018-10-01
• Series: Chemical Engineering Transactions
• Online Access: https://www.cetjournal.it/index.php/cet/article/view/9256

This work presents a design principle for the prediction of the separation efficiency of random, non-perforated and lattice-type, packing with different size and type for gas-liquid systems under high pressure up to 90 bar for distillation and absorption systems in the entire operating range up to the flooding point. In the first part the known correlations from literature were used for calculation of separation efficiency of different random packings for distillation data taken from literature, valid for the systems used under higher pressure. As a conclusion of this analysis, big deviations of calculation results in comparison to experimental data were observed, Hanley & Chen (2012). The application of the new droplet model presented by Mackowiak (2015) was validated for more than 24 test systems and 115 packing types in the low pressure range from 13 to 1000 mbar. In this work the model was validated using additionally 10 different test systems in the pressure range up to 90 bar. The presented correlation does not require empirical, individual packing specific constants, which is a very important advantage of this model for practical design of packed columns. Good consistency was found between experimental values of the separation efficiency and calculated values based on the model for different types of random packings of 1st and 2nd generation such as Berl Saddle, Raschig-Ring, Pall-Ring but also for lattice type packing of 3rd and 4th generation.