Breakthrough Studies of Methyl Salicylate and DMMP Mixed in Methyl Salicylate with Pressure Swing Adsorption Composed of 13X Molecular Sieves

G Swetha; T Gopi; S Chandra Shekar; C Ramakrishna; Bijendra Saini

doi:10.14429/dlsj.1.10734

G Swetha Defence Research and Development Establishment, Gwalior
T Gopi Defence Research and Development Establishment, Gwalior
S Chandra Shekar Defence Research and Development Establishment, Gwalior
C Ramakrishna Defence Research and Development Establishment, Gwalior
Bijendra Saini Defence Research and Development Establishment, Gwalior

DOI: https://doi.org/10.14429/dlsj.1.10734

Keywords: Methyl salicylate, dimethyl methyl phosphonate, pressure swing adsorption, 13X molecular sieves, XAD-2

Abstract

A test procedure for pressure swing adsorption (PSA) was established and elucidated for the air purification using methyl salicylate (MeS) and 5% (v/v) dimethyl methyl phosphonate (DMMP) in MeS containing air stream as feed. The effect of feed flow rate was studied by varying the flow from 5 lpm to 20 lpm, for both the molecules at 25 oC and 4 kg/cm2. The results revealed that the flow rate had a significant influence on the breakthrough time. A method was developed for the determination of feed, purge, and dry air composition, by the solvent extraction method using the XAD-2 and the average concentrations reported. The 13X molecular sieves were characterised for its structural and textural properties such as BET- SA, XRD, and FT-IR. The temperature programmed desorption of DMMP and MeS on 13X clearly demonstrated that it was easily regenerated at ~320 °C after prolonged field operation of PSA. The PSA results obtained with PSA composed molecular sieves appeared to give promising technology for air purification and specifically to the chemical warfare agents simulants.

Author Biographies

G Swetha, Defence Research and Development Establishment, Gwalior

Ms Swetha Gujarathi obtained her MSc (Chemistry) from the Osmania University Hyderabad, in 2010. Currently working as a Senior Research Fellow at Defence Research and Development Establishment, Gwalior and her research interests is Development of regenerable NBC filters and catalysis for fine chemicals and environmental cleanup applications which includes method development for passive sampling technique and real time analysis for low volatile compounds

T Gopi, Defence Research and Development Establishment, Gwalior

Mr Gopi thakkallapalli obtained his MSc (Chemistry) from the Osmania University Hyderabad, in 2010. Currently working as a Senior Research Fellow at Defence Research and Development Establishment, Gwalior and his research interests in the selective and total oxidation for the fine chemicals and environmental cleanup applications at low temperature which includes synthesis of functionalised nonmaterial/catalysts

S Chandra Shekar, Defence Research and Development Establishment, Gwalior

Dr. S. Chandra Shekar obtained his MSc (Chemistry) from the Kakatiya University, in 1992 and PhD from the Indian Institute of Chemical Technology, Hyderabad and currently working as a Scientist ‘E’ in the Defence Research and Development Establishment, DRDO, Gwalior. He published more than 25 research papers in international journals. His research interests include : Development of regenerable NBC filters, development of integrated test facilities and catalysis for environmental cleanup applications specific to reduce the logistic burden of the conventional NBC filters

C Ramakrishna, Defence Research and Development Establishment, Gwalior

Mr Chowdam Ramakrishna obtained his MSc (Chemistry) from the Sri Krishnadevaraya University, Anantapur, Andhra Pradesh in 2007. Currently he is working as a Scientist ‘C’ in the Defence Research and Development Establishment, DRDO, Gwalior. His research interests include: Degradation decontamination of organo sulphur/phosphorus compounds with special emphasis on ozone assisted catalytic decontaminations/oxidations at low temperatures

Bijendra Saini, Defence Research and Development Establishment, Gwalior

Mr Bijendra kumar obtained his MSc (Chemistry) from Rajasthan University, Jaipur, in 2013. Currently he is working as a Senior Technical Assistant ‘B’ in the Defence Research and Development Establishment, DRDO, Gwalior. His research interests include: Development of regenerable NBC filters, analytical method development for NBC canister and handling the various sophisticated instruments like online GCMS, GC FID/PFPD/FPD based detectors for trace level analysis.