Pervaporation separation of toluene/n-heptane mixtures using a MSE-modified membrane: Effects of operating conditions

High‐flux and solvent‐selective membranes with aromatic functionalities and dual‐layer structures

“…This kind of membrane shows a toluene/ n ‐heptane selectivity of about 2.2, which has been rarely reported in the literature. However, it is not as efficient as pervaporation membranes 9,32–34 . We speculate that the direct preparation of DAN‐based PA layer on nylon support might have too many defects.…”

“…Compared with traditional technologies, such as liquid–liquid extraction, azeotropic distillation, and extractive distillation, membrane technology holds great promise owing to its small footprint, easy operation, and low energy cost 1–7 . In the past decades, pervaporation, one representative membrane technology used to separate liquid mixtures, has long been the first choice to acquire the desired selectivity 8–12 . Solution‐diffusion theory is often utilized to describe the separation mechanism of this technique 13,14 .…”

Transient computational fluid dynamics modeling of pervaporation separation of aromatic/aliphatic hydrocarbon mixtures using polymer composite membrane

“…A composite polymeric membrane, which was prepared via MSE‐modification technology, was supplied by PolyAn GmbH Co. (Germany). More details for the membrane structure can be found in our previous work [24]. Toluene and n C 7 in technical grade (purity ≥ 99%) were supplied as raffinates of aromatic removing units of petrochemical complexes in Iran.…”

“…In all tests, permeate pressure was maintained at a low level by an oil sealed vacuum. In order to keep the feed concentration constant during the PV experiment, recycling of the retentate was carried out and the average stabilization time was 60 min [24].…”

“…Total permeation flux ( J ) and separation factor or selectivity (α) were calculated using Eqs. 1 and 2 [24, 25]: where m (kg) is total mass of the permeate collected through effective area of the membrane A (m 2 ) during the time interval t (h). x i and y i are the weight fractions of component i in feed (F) and permeate (P) streams, respectively.…”