Methyl acetate hydrolysis reaction intensified by extractive distillation in dividing wall column

Extractive Dividing Wall Column for Separating Azeotropic Systems: A Review

“…The second reason, explained by Loy et al, is that the heat transfer across the wall can be neglected since the EDWC is modeled as a thermodynamically equivalent system within the modeling software . Using a thermodynamically equivalent system, termed a shortcut method, to model an EDWC is necessary since no modeling software has a built-in model for any dividing-wall columns. ,,,,,,,,, The main simulation design methods that researchers use are either two-column ,,,,,,,,− ,− ,,− or three-column ,,,,,,, designs using Aspen Plus or ChemCAD. The modeling software for each separation is shown in Table .…”

“…43,55−58 It is possible to couple an EDWC with another column or a decanter depending on the system. 19,24,27,34,38,45,46,49,54,60,61 The most common types of EDWCs are shown in Figure 3. This section provides an overview of the different EDWC designs that have been published.…”

“…[44][45][46]53,65 The list of entrainers to try with this method can be shortened based on side reactions and results from the infinite dilution activity coefficient method. 45,53 This method is found in the literature, but only for common azeotropes. 44,53 It is beneficial to use an entrainer screening process instead of the more timeconsuming guess-and-check method.…”

“…An EDWC can be thought of as a column with a side-rectifier built in . These designs include traditional EDWCs, ,,,,,− ledge wall, ,,,,,,,,− middle wall, ,,,,,− and double dividing walls. , The designs may also incorporate heat assistance such as intermediate heating and heat pumps. ,− It is possible to couple an EDWC with another column or a decanter depending on the system. ,,,,,,,,,, The most common types of EDWCs are shown in Figure . This section provides an overview of the different EDWC designs that have been published.…”

“…An alternative method to using a thermodynamic model is to run flash models in Aspen Plus to see the altered relative volatilities of the most used entrainers. − ,, The list of entrainers to try with this method can be shortened based on side reactions and results from the infinite dilution activity coefficient method. , This method is found in the literature, but only for common azeotropes. , It is beneficial to use an entrainer screening process instead of the more time-consuming guess-and-check method . However, all methods require testing each entrainer with the desired azeotrope. ,, It is critical that the entrainer makes the azeotrope disappear when looking at the vapor–liquid equilibrium curves of the system. ,, This can be shown by plotting phase equilibrium diagrams with each entrainer and looking at the distance between the equilibrium curve and the 45° diagonal line. ,,,,, The greater the distance from the diagonal line, the better the entrainer is for the given system .…”