Determination of mass transfer coefficient in an L-shaped pulsed column with sieve-plate structure: Application of best-fit technique, drop size distribution, and forward mixing model

• Published in: Chemical engineering and processing 2022-01, Vol.170, p.108706, Article 108706
• Main Authors: Saremi, Mojtaba, Torkaman, Rezvan, Safdari, Jaber, Rafiei, Vahid, Mallah, Mohammad H., Asadollahzadeh, Mehdi
• Format: Article
• Language: English
• Subjects: Best-fit technique; Drop size distribution; Forward mixing model; L-shaped pulsed column; Mass transfer coefficient; PSO algorithm
• ISSN: 0255-2701; 1873-3204
• DOI: 10.1016/j.cep.2021.108706

•Forward mixing model was used for mass transfer assessment of an LPSPC.•The best-fit technique was applied for finding optimal values of fitting parameters.•The Koda was plotted as a function of droplets size.•Influences of different variables on the Koda curve were studied.•Empirical correlations were established for the Ec, Ed, and Kod coefficients. The mass transfer coefficient in extraction columns is extremely affected by the size of the droplets. Among the available models to describe the extraction columns, only the forward mixing model (FMM) has considered the effect of droplets size on the column performance. In this research, the performance of an L-shaped pulsed sieve-plate column (LPSPC) was studied using the FMM. A real-code using the best-fit technique and PSO algorithm was developed for finding the optimal values of the axial dispersion and overall mass transfer coefficients. The effect of the operating parameters including pulsing velocity, continuous and dispersed phase flow rate on the volumetric overall mass transfer coefficient, the axial dispersion coefficients, and the mass transfer driving force was studied for two standard chemical systems. It was found that the LPSPC has an optimal operation at the pulsing velocity of 0.95 cm/s in each of the horizontal and vertical sections. Moreover, the performance of the column is strongly dependent on the ratio of the inlet velocity of the phases. It is worth noting that, the separation efficiency in the vertical section is slightly (on average 5%) higher than in the horizontal section of the column. Graphical Abstract [Display omitted]