Temperature measurements with two different IR sensors in a continuous-flow microwave heated system

Beilstein Journal of Organic Chemistry

Måns Thulin¹  Jonas Sävmarker²  Mats Larhed²  Jonas Rydfjord²  Fredrik Svensson²  Magnus Fagrell³ 

[1] Department of Mathematics, Uppsala University, Box 480, 751 06 Uppsala, Sweden;Department of Medicinal Chemistry, Uppsala University, Box 574, 751 23 Uppsala, Sweden;Wavecraft AB, Bergsbrunnagatan 11, 753 23, Uppsala, Sweden;

关键词: continuous-flow;    flow chemistry;    heating;    microwave;    organic synthesis;    temperature;   

DOI  :  10.3762/bjoc.9.244

来源: DOAJ

【 摘 要 】

In a continuous-flow system equipped with a nonresonant microwave applicator we have investigated how to best assess the actual temperature of microwave heated organic solvents with different characteristics. This is non-trivial as the electromagnetic field will influence most traditional methods of temperature measurement. Thus, we used a microwave transparent fiber optic probe, capable of measuring the temperature inside the reactor, and investigated two different IR sensors as non-contact alternatives to the internal probe. IR sensor 1 measures the temperature on the outside of the reactor whilst IR sensor 2 is designed to measure the temperature of the fluid through the borosilicate glass that constitutes the reactor wall. We have also, in addition to the characterization of the before mentioned IR sensors, developed statistical models to correlate the IR sensor reading to a correct value of the inner temperature (as determined by the internal fiber optic probe), thereby providing a non-contact, indirect, temperature assessment of the heated solvent. The accuracy achieved with these models lie well within the range desired for most synthetic chemistry applications.

【 授权许可】

Unknown