|Title:||Preparation of gel structured Poly styrene-ethylene glycol dimethacryalate (PS-EGDM) based high capacity ion exchange resin and its characterization|
Sinha, Shishir N.
|Published in:||Proceedings of AIChE Annual Meeting|
|Abstract:||There are so many unit operations in which application of ion exchangers employed such as deionization and de-minralization of impure water as packed bed for exchange of ions. These ion exchangers or ionic polymers either cationic, anionic or both are chemically bonded materials have exchangable functional groups within their structure. Most common ion exchangers in this class are polystyrene-divinyl benzene (PS-DVB), Poly (methyl methacrylate)-ethyleneglycol dimethacrylate (PMMA-EGDM) based high capacity anion exchange resin. These ion exchangers have different network structure which depends upon the crosslinking by crosslinking media. The choice of crosslinking media has been made on the basis of degree of crosslinking. The exchanging property of ion exchangers is because of these functional groups in it, and functional groups are created on the crosslinked polymer gel by various liquid and gas phase modification[1-2]. The PS-DVB resin is very popular as ion exchange resin during last 15 years study due to good mechanical strength and stability in the entire range of pH . These resins can be prepared in the form of beads by suspension polymerization or alternatively emulsion polymerization. Mostly different copolymers based ion exchange resin were prepared using suspension polymerization technique using different monomers, crosslinking agents, porogen and different parameters [4-7]. Another polymerization technique called emulsion polymerization in which polymer formation occur in an inert medium in which the monomer is partially soluble[8-10]. In the present study preparation of high capacity polystyrene-ethyleneglycol dimethacrylate (PS-EGDM) based ion exchange resin by suspension polymerization technique which is having higher mechanical strength, stable and hydrophilic in nature. Suspension polymerization of polystyrene-ethyleneglycol dimethacrylate (PS-EGDM) is carried out in the presence of toluene as porogen and gelatin as stabilizer. This resin is subsequently functionalized by gas phase nitration. Weak base groups NO 2 have been introduced into crosslinked polymethyl methacryalate divinyl benzene (PSDVB) by nitration (gas phase modification) using NOX and then resin undergo subsequent chemical reaction with amination route by hydrazine hydrate for further functionlization i.e. reduction of the NO 2 into NH 2 groups which is a wet chemical modification scheme. Resins of this type carry amino groups directly attached to the phenyl rings, have very low base strength. The liquid phase nitration using nitric acid degrades the resin and it loses its mechanical strength .|
|Citation:||Proceedings of AIChE Annual Meeting, (2011). Minneapolis, MN|
|Author Scopus IDs:||57203389803|
|Author Affiliations:||Sharma, G., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee- 247667, Uttrakhand, India|
Sinha, S., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee- 247667, Uttrakhand, India
Kumar, S., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee- 247667, Uttrakhand, India
|Corresponding Author:||Sharma, G.; Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee- 247667, Uttrakhand, India|
|Appears in Collections:||Conference Publications [CH]|
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