I&EC 314 |
| Accurate and automated determination of reaction kinetics may prove crucial to identifying an optimum ionic liquid composition and catalyst for a given reaction. The paper describes a device based on a microchannel network that uses rapid mixing to produce an initial mixture that is then allowed to react for a specified time interval before being ejected for analysis by HPLC. The mixing time determines the uncertainty with which the start of reaction is known and the uniformity of the mixing determines the uncertainty in the composition conditions within the sample. Previous work by the authors has shown that it is possible to construct the mixing part of the network to produce any required degree of uniformity, but the greater the uniformity the longer will be the time taken to mix. Thus, there is a trade-off between uniformity and uncertainty in the initiation time for the reaction. A mixing time of around 100 ms and an rms deviation in composition of around 10% have been achieved in the current device. For reactions taking place in minutes this uncertainty in the starting time for the reaction introduces negligible error. The device is controlled by computer, allowing a series of tests at different reaction times and conditions to be carried out automatically. The device has been operated routinely for series of tests lasting up to 8 hours, with two such tests each day for one week. Preliminary results for a specimen reaction will be presented to illustrate the application of the device |
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Ionic Liquids: Not Just Solvents Anymore OR Ionic Liquids: Parallel Futures (Sponsored by Green Chemistry and Engineering, Separation Science and Technology and Novel Chemistry with Industrial Applications Sub-Divisions)
1:30 PM-5:45 PM, Thursday, 30 March 2006 Georgia World Congress Center -- B314, Oral
Division of Industrial and Engineering Chemistry |