title: Pervaporation performance of PPO membranes in dehydration of highly hazardous mmh and udmh liquid propellants.
abstract: Polyphenylene oxide (PPO) membranes synthesized from 2,6-dimethyl phenol monomer were subjected to pervaporation-based dehydration of the highly hazardous and hypergolic monomethyl hydrazine (MMH) and unsymmetrical dimethyl hydrazine (UDMH) liquid propellants. Membranes were characterized by TGA, DSC and SEM to study the effect of temperature besides morphologies of surface and cross-section of the films, respectively. Molecular dynamics (MD) simulation was used to study the diffusion behavior of solutions within the membrane. CFD method was employed to solve the governing mass transfer equations by considering the flux coupling. The modeling results were highlighted by the experimental data and were in good agreement. High separation factors (35-70) and reasonable water fluxes (0.1-0.2 kg/m(2)h) were observed for separation of the aqueous azeotropes of MMH (35 wt%) and UDMH (20 wt%) and their further enrichment to >90% purity. Effect of feed composition, membrane thickness and permeate pressure on separation performance of PPO membranes were investigated to determine optimum operating conditions.
authors.affiliation: Membrane Separations Group, Chemical Engineering Division, Indian Institute of Chemical Technology (IICT), Hyderabad 500007, India.
authors.forename: Siddhartha
authors.initials: S
authors.lastname: Moulik
authors.affiliation: Membrane Separations Group, Chemical Engineering Division, Indian Institute of Chemical Technology (IICT), Hyderabad 500007, India.
authors.forename: K Praveen
authors.initials: KP
authors.lastname: Kumar
authors.affiliation: Membrane Separations Group, Chemical Engineering Division, Indian Institute of Chemical Technology (IICT), Hyderabad 500007, India.
authors.forename: Subha
authors.initials: S
authors.lastname: Bohra
authors.affiliation: Membrane Separations Group, Chemical Engineering Division, Indian Institute of Chemical Technology (IICT), Hyderabad 500007, India. Electronic address: sridhar11in@yahoo.com.
authors.forename: Sundergopal
authors.initials: S
authors.lastname: Sridhar
mesh_terms: D019813:1,2-Dimethylhydrazine / Q000737:chemistry*; D000335:Aerosol Propellants / Q000737:chemistry*; D000465:Algorithms; D002152:Calorimetry, Differential Scanning; D015386:Hazardous Substances / Q000737:chemistry*; D006834:Hydrazines / Q000737:chemistry*; D008567:Membranes, Artificial; D008855:Microscopy, Electron, Scanning; D008958:Models, Molecular; D009002:Monomethylhydrazine / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000335:Aerosol Propellants; D015386:Hazardous Substances; D006834:Hydrazines; D008567:Membranes, Artificial; D010636:Phenols; D011108:Polymers; D014867:Water; C027420:polyphenylene oxide; D019813:1,2-Dimethylhydrazine; D009002:Monomethylhydrazine
keywords: CFD; MMH; Pervaporation; Polyphenylene oxide membrane; UDMH