June 2004

Extra Report: Laboratory and Online Analyzers

Consider MRA for online analysis

This new technique uses radio frequencies to do quantitative evaluations on hydrocarbon streams

Lough, V., Invensys Process MRA

Online magnetic resonance analysis (MRA) spectroscopy is an emerging technique to quantitatively evaluate hydrocarbon streams. MRA uses radio frequencies to excite the nuclei of atoms and then measures how long it takes the atom to return to its resting state. The location and amplitudes of the spectra lines can be used to determine chemical structure and concentration. The presented examples indicate that this innovative method can be a beneficial online analytical tool in refining applications. Measurement principle of MRA spectroscopy. MRA relates to the magnetic properties of atomic nuclei; the simplest example is that of a hydrogen nucleus or proton. The hydrogen nucleus has both

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