2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 5. Marquis Intl. Symp. / New and Advanced Materials and Technologies
| Editors: | Kongoli F, Marquis F, Chikhradze N |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2017 |
| Pages: | 590 pages |
| ISBN: | 978-1-987820-69-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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BH3CN Anion-based Hypergolic Hydrophobic Ionic Liquids
Vikas K Bhosale1;1DEFENCE INSTITUTE OF ADVANCED TECHNOLOGY, Pune, India;
Type of Paper: Regular
Id Paper: 306
Topic: 43
Abstract:
Hypergolic fuels (auto ignition with storable oxidizers) have special importance in liquid rocket propulsion, because it gives the better thrust control, eliminates external ignition source, and provides an ability to restart the mission having multiple operations. However, conventional hypergolic fuel (Hydrazine, monomethyl hydrazine MMH, unsymmetrical hydrazine UDMH, etc.) have severe limitations viz., high vapor pressure (e.g hydrazine, 14.4 mmHg), extreme respiratory and dermatological toxicity; and therefore requires safety precautions. Hence, it is essential to develop new environmental friendly hypergolic fuels. Recently, ionic liquids (HILs, liquid salts having negligible vapor pressure) have steered keen interest towards the liquid hypergolic fuel. Nevertheless, ultrafast igniting hydrophobic ILs have been a major challenge in hypergolic ionic liquids, because as ions absorb the moisture content, they reduce the performance of hypergolic fuel.
Authors explored ultrafast igniting cyanoborohydride based hydrophobic ILs with imidazolium cationic core, for the very first time. The physicochemical properties (melting and decomposition temperature, density and viscosity) and performance evaluation (heat of formation, ignition delay, and specific impulse) of ILs were found to be astonishingly admirable. The studies evaluating the role of cationic hydrocarbon chain of ILs on the properties of hypergolic fuel were carried out. All the ILs were liquid at room temperature and exhibited a positive heat of formation. Consequently, hydrolytic stability of ILs was thoroughly investigated under standard environmental conditions. ILs, 1, 3-diallyl-imidazolium cyanoborohydride, 1-allyl-3-butyl imidazolium cyanoborohydride and 1-allyl-3-octyl imidazolium cyanoborohydride were insoluble with water. The moisture study of ILs was investigated by using FTIR and moisture analyzer. ILs with unsaturated and long alkyl chain of imidazolium cations with cyanoborohydride anion based ILs were found to exhibit more stability in comparison to DCA anion based ILs. The hydrophobic IL 1, 3-diallyl-imidazolium cyanoborohydride exhibited the shortest ignition delay of 1.8 ms with WFNA and IL, 1-allyl-3-ethyl imidazolium cyanoborohydride presented the lowest viscosity of 16.62 mPa不. Therefore, these ILs can be suggested as potential candidate to replace the conventional toxic hypergolic fuels.