Pervaporation membranes with poly(γ-benzyl-l-glutamate) selective layers for separation of toluene–n-heptane mixtures

Two-Ply Composite Membranes with Separation Layers from Chitosan and Sulfoethylcellulose on a Microporous Support Based on Poly(diphenylsulfone-N-phenylphthalimide)

“…The size of the voids in the cross-section of this support decreases in the direction towards the top surface, where in a surface region the so named skin layer is formed. The morphology of the PAI-SO 2 support was previously described, and the pores in the skin layer of the asymmetric membrane were visualized [28,29]. The concentration of pores in the skin layer did not change significantly in the different samples and was about (3–5) × 10 9 cm −2 .…”

“…One important requirement was the use of well-characterized support with a smooth surface on the top layer. Therefore, the choice of support was a porous PAI-SO 2 membrane formed under the conditions described in [28]. The size of the voids in the cross-section of this support decreases in the direction towards the top surface, where in a surface region the so named skin layer is formed.…”

“…The asymmetric micro-porous supporting film (membrane support) was prepared from PAI-SO 2 as a phase-inversion membrane using a previously described technique [28,29]. Support samples were prepared by a dry-wet method that involved immersing gel-films of PAI-SO 2 in NMP on glass plates into an aqueous precipitation bath.…”

“…The PV experiments were performed at feed temperatures of 40 or 51 °C to separate aqueous alcohol (ethanol or propan-2-ol) mixtures of different compositions (see Table 1) with the following measurement technique: vacuum degassing of the space under the membrane on a laboratory autonomous non-continuous flow set-up with an operating membrane area of 1.38 × 10 −3 m 2 [28]. …”

Separation of polyaromatic hydrocarbons from model diesel composition via pervaporation using a fabricated aromatic polyimide membrane and process optimization

“…High temperature/high performance polymers such as polyamides, poly(amideimide)s, specially polyimides are a class of thermally stable polymers, often based on stiff aromatic backbones; they exhibit excellent balance of mechanical and thermal properties, which make them useful materials for engineering applications. Aromatic polyimides (APIs) have been identified as effective membrane materials for the pervaporative separation of aliphatic/aromatic mixtures like benzene/cyclohexane as is evident from literature. Katarzynski and Staudt reported effective separation of naphthalene/ n ‐decane mixtures using 6FDA‐DABA‐coplyimide membranes.…”