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Cryogenic homogenization and sampling of heterogeneous multi-phase feedstock

United States Patent

June 4, 2002
View the Complete Patent at the US Patent & Trademark Office
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An apparatus and process for producing a homogeneous analytical sample from a heterogenous feedstock by: providing the mixed feedstock, reducing the temperature of the feedstock to a temperature below a critical temperature, reducing the size of the feedstock components, blending the reduced size feedstock to form a homogeneous mixture; and obtaining a representative sample of the homogeneous mixture. The size reduction and blending steps are performed at temperatures below the critical temperature in order to retain organic compounds in the form of solvents, oils, or liquids that may be adsorbed onto or absorbed into the solid components of the mixture, while also improving the efficiency of the size reduction. Preferably, the critical temperature is less than 77 K ( C.). Further, with the process of this invention the representative sample may be maintained below the critical temperature until being analyzed.
Doyle; Glenn Michael (Lakewood, CO), Ideker; Virgene Linda (Arvada, CO), Siegwarth; James David (Boulder, CO)
The United States of America as represented by the Department of Energy (Washington, DC)
09/ 400,822
September 21, 1999
The United States Government has rights in this invention pursuant to the employer-employee relationship of the U.S. Department of Energy and the inventor.