Robust polyamide-PTFE hollow fibre membranes for harsh organic solvent nanofiltration was written by Francis, Verona Nithya;Chong, Jeng Yi;Yang, Guoying;Che, Lei;Wang, Rong. And the article was included in Chemical Engineering Journal (Amsterdam, Netherlands) in 2023.Category: chlorides-buliding-blocks This article mentions the following:
Polymeric membranes have been extensively studied for organic solvent nanofiltration (OSN) but many fail to show sufficient chem. resistance in strong solvents like DMF (DMF) and DMSO (DMSO). This study focuses on harnessing the outstanding chem. resistance of polytetrafluoroethylene (PTFE), to develop polyamide-PTFE thin film composite (TFC) membranes that are resistant to such aprotic solvents. A defect-free polyamide thin film layer was successfully synthesized on the microfiltration PTFE hollow fiber substrates, overcoming challenges such as large and uneven pore size, and hydrophobicity of the PTFE substrates. A simple polydopamine (PDA) coating was carried out to improve the substrate’s hydrophilicity prior to the polyamide synthesis via interfacial polymerization (IP). Polyethyleneimine (PEI) and trimesoyl chloride (TMC) were used as the monomers and a two-time IP method was employed to obtain a defect-free polyamide coating. The synthesized membranes showed high acetonitrile (ACN) and DMF permeabilities of 7.94 and 3.70 lm-2h-1bar-1, resp., with acid fuchsin (585 Da) rejections of > 90%. The mol. weight cut-off (MWCO) of the membranes could be further reduced to ∼300 Da by the addition of piperazine (PIP) monomers. The membranes also showed excellent stability and performance in a 72-h OSN test performed in DMF indicating their great potential in effective mol. separation in harsh solvents. This study demonstrates how a simple modification and coating technique can transform com. available microfiltration PTFE hollow fibers into durable and high value OSN membranes. In the experiment, the researchers used many compounds, for example, Trimesoylchloride (cas: 4422-95-1Category: chlorides-buliding-blocks).
Trimesoylchloride (cas: 4422-95-1) belongs to organic chlorides. Organic chlorides can be used in production of: PVC, pesticides, chloromethane, teflon, insulators.While alkyl bromides and iodides are more reactive, alkyl chlorides tend to be less expensive and more readily available. Alkyl chlorides readily undergo attack by nucleophiles.Category: chlorides-buliding-blocks
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics