Effect of Solvent Content on the Separation and the Energy Consumption of Extractive Distillation Columns

CAMD for entrainer screening of extractive distillation process based on new thermodynamic criteria

“…According to the general feasibility criterion (Rodríguez-Donis et al, 2009a;, it should lie close enough to the edge AE to intersect the rectifying section profile that will reach the distillate product specification. Regarding the x E value itself, De Figueirêdo et al (2015) pointed out that the optimized process with minimum TAC is mainly determined by the reflux ratio corresponding to an optimal location of F E in the ternary diagram at x E between 0.2 and 0.75, in agreement with our results. Additionally, based on our experience over many case studies, we also observe that the optimal liquid profile of the extractive distillation column is commonly located in the region where˛A ,B varies between 1.5 and 3 for this diagram class (1.0-1a).…”

Review of extractive distillation. Process design, operation, optimization and control

“…For the (1.0-1a) extractive separation class concerned here, we explained that a limit value of entrainers exist. Several authors have investigated concomitantly the effect of that entrainer content on optimal design, either focusing on the SN extr location (De Figueirêdo et al, 2015a;Brito, 2015) or analyzing the whole extractive section profile with a separation efficiency indicator (You et al, 2015a,b). They concluded that there exists an optimal range for the entrainer content and for the number of stages in the extractive section, with a compromise between them.…”

Optimization of pre-concentration, entrainer recycle and pressure selection for the extractive distillation of acetonitrile-water with ethylene glycol

“…In the extractive distillation process, monitoring the amount of entrainer in the middle (extractive) section, between the entrainer and main feed tray locations, is vital for separating azeotropic mixture. Knapp and Doherty (1994) discussed the minimal amount of entrainer and De Figueiredo et al (2015aFigueiredo et al ( , 2015b used the amount of entrainer on the entrainer feed tray as a constraint for designing the column. In this work we use the efficiency indicator of extractive section E ext and the efficiency indicator of per tray in extractive section e ext that we proposed recently (You et al, 2015a).…”

“…Some authors have also noticed that a properly designed column usually exhibit features related to the entrainer ability to enhance volatility. Hence, they have solved multi-objective problem including the maximization of a separation efficiency indicator (You et al, 2015a(You et al, , 2015b, or added additional constraints to a mono-objective problem like the entrainer content on the solvent feed tray (De Figueiredo et al, 2015a. Furthermore, several authors have shown the importance of optimizing the extractive distillation column together with the entrainer regeneration column (Luyben and Chien, 2011) and to do so simultaneously (Kossack et al, 2008;García-Herreros et al, 2011;You et al, 2015a).…”