Search results for "Thermal control"
showing 5 items of 5 documents
Heat pipe controlled syntheses of ionic liquids in microstructured reactors
2009
Abstract The combination of a heat pipe and a microstructured reactor allows to perform highly exothermal reactions under safe conditions. First experiments for the synthesis of 1,3-dimethylimidazolium-triflate from 1-methylimidazol and methyl triflate showed that at high flow rates of more than 5 ml/min through a single 300 μm × 500 μm wide and 400 mm long channel quantitative conversion could be achieved. This chemical reaction, known for extreme heat release, can be retained under thermal control even at much higher flow rates.
Heat Pipe-Mediated Control of Fast and Highly Exothermal Reactions
2011
The synthesis of 1-ethyl-3-methylimidazolium ethyl-sulfate ([EMIM]EtSO4) from 1-methyl-imidazole and diethyl sulfate suffers from highly exothermal behavior. Once the activation energy barrier is reached (EA = 89 kJ mol–1), the bimolecular reaction accelerates with a high reaction enthalpy (ΔH = −130 kJ mol–1).(1-3) The excess of heat has to be concurrently dissipated to avoid hot spots or thermal runaways. Depending on the volume flow velocity of the reactants and the applied reactor temperature, the reaction zone can be shifted inside the reactor from the inlet to the outlet and vice versa. Therefore, a sophisticated thermal control, oscillating between providing activation energy and int…
Insights into localized manipulation of organogel-related microcrystalline spherulite formation
2015
Abstract The formation processes of microcrystalline spherulitic fiber systems related to bile acid amides were determined to include dominant interface-related aspects, the role of which were studied in terms of potential manipulation and increased control over the overall structure of the networks. The nucleation and growth properties and aggregation of two lithocholyl amide derivatives were studied in several organic solvents using thermomicroscopy, as well as thermal control at macroscopic level. Nucleation/crystallization at interfaces was observed to act as the main route for the formation of microcrystalline fibers/solids in six gelator–solvent systems, in which spherulite formation …
Legri Instrument Health. A Historical Review
2001
LEGRI has been operating successfully on MINISAT-01 since its switch-on the 22nd of May 1997. HouseKeeping (HK) data have been continuously received for nearly two years by LEGRI SOC in Valencia, and subsequently checked on a daily basis and then stored for long term monitoring analysis. LEGRI HouseKeeping data include three critical operating parameters: temperature, power and polarisation voltages. Six temperature sensors are spread over the different LEGRI units: Detector Unit, Data Processing Unit, High Voltage Unit and Star Sensor. Voltages are measured at eight different points. Detector Unit temperature and polarisation voltage are the critical parameters for LEGRI operation. Solid s…
Thermal Analysis of the Solar Orbiter PHI Electronics Unit
2020
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