System for monitoring the progress of a chemical reaction in a m

Details System for monitoring the progress of a chemical reaction in a m System for monitoring the progress of a chemical reaction in a m

1999-04-28

2000-03-07

Walberg, Teresa

Electric heating

Microwave heating

With control system

219687, 422 21, H05B 666

Patent

active

060343613

ABSTRACT:
A system for monitoring the progress of a chemical reaction in a microwave-assisted preparation of a sample, having a microwave energy source, a waveguide coupled to the microwave energy source and having a waveguide cavity, and a resistive load coupled to the waveguide, wherein the sample that is to be subject to microwave-assisted heating is situated in a reaction vessel. The reaction vessel is located in the path of the forward microwave radiation between the microwave energy source and the resistive load. An energy monitoring device is interposed between the reaction vessel and the resistive load so as to monitor the energy not absorbed by the reaction vessel. The energy absorbed by the sample may be calculated in accordance with the level of energy measured by the energy monitoring device to provide a value that indicates the status of the chemical reaction. Alternatively, the reaction vessel may be located in the path of the forward microwave radiation between the microwave energy source and a terminal end of the waveguide. An isolator provided in the form of a circulator coupled to the resistive load is located in the path of the forward microwave radiation between the microwave energy source and the reaction vessel so as to allow the forward energy to proceed to the sample, and to divert reverse energy to the resistive load. The energy absorbed by the sample may be calculated in accordance with the difference in the levels of energy respectively measured by forward energy and reverse energy monitoring devices.

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G. Majetich and R. Hicks, "The Use Of Microwave Heating To Promote Organic Reastions," Published Nov. 3, 1994, Copyright International Microwave Power Institute.
E.D. Neas & M.J. Collins, "Microwave Heating Theoretical Concepts and Equipment Design," ACS Professional Reference Book "Introduction to Microwave Sample Preparation Theory and Practice," 1998 American Chemical Society, Chapter 2, pp. 7-32.
H.M. Kingston and L.B. Jassie, "Monitoring and Predicting Parameters in Microwave Dissolution," ACS Professional Reference Book "Introduction to Microwave and Sample Preparation Theory and Practice," 1998 American Chemical Society, Chapter 6, pp. 93-154.

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