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: Siddhartha Moulik, K Praveen Kumar, Subha Bohra, Sundergopal Sridhar
• Journal: Journal of hazardous materials (J Hazard Mater) Vol. 288 Pg. 69-79 (May 15 2015) ISSN: 1873-3336 [Electronic] Netherlands
• PMID: 25698568 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2015 Elsevier B.V. All rights reserved.

Chemical References

• Aerosol Propellants
• Hazardous Substances
• Hydrazines
• Membranes, Artificial
• Phenols
• Polymers
• Water
• polyphenylene oxide
• 1,2-Dimethylhydrazine
• Monomethylhydrazine

Topics

• 1,2-Dimethylhydrazine (chemistry)
• Aerosol Propellants (chemistry)
• Algorithms
• Calorimetry, Differential Scanning
• Hazardous Substances (chemistry)
• Hydrazines (chemistry)
• Membranes, Artificial
• Microscopy, Electron, Scanning
• Models, Molecular
• Monomethylhydrazine (chemistry)
• Phenols (chemistry)
• Polymers (chemistry)
• Temperature
• Water (chemistry)