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Indirect measurement of nitrogen in a multi-component natural gas by heating the gas

United States Patent

June 22, 2004
View the Complete Patent at the US Patent & Trademark Office
Methods of indirectly measuring the nitrogen concentration in a natural gas by heating the gas. In two embodiments, the heating energy is correlated to the speed of sound in the gas, the diluent concentrations in the gas, and constant values, resulting in a model equation. Regression analysis is used to calculate the constant values, which can then be substituted into the model equation. If the diluent concentrations other than nitrogen (typically carbon dioxide) are known, the model equation can be solved for the nitrogen concentration.
Morrow; Thomas B. (San Antonio, TX), Behring, II; Kendricks A. (Torrance, CA)
Southwest Research Institute (San Antonio, TX)
10/ 460,579
June 12, 2003
GOVERNMENT LICENSE RIGHTS The U.S. Government has a paid-up license in this invention and the right in certain circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract No. DE-FC21-96MC33033 for the U.S. Department of Energy.