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AssigneeMatheson Tri-Gas, Inc.
InventorsHans H. Funke, Dan Fraenkel, Virginia H. Houlding
Estimating the term…
Trace impurities such as organic compounds and carbon monoxide are reduced to sub-ppb levels in gases such as nitrogen, helium and argon, by gas purifying systems that contain an ultra-low emission (ULE) carbon material. Ultra-low emission (ULE) carbon materials can be made from commercially available carbon materials in the form of pellets, extrudates and beads and is capable of removing impurities from a gas stream down to parts-per-billion (ppb) and sub-ppb levels without concurrently emitting other impurities such as moisture or carbon dioxide to the purified gas stream. The carbon material is superactivated by heating the carbon to temperatures from 300° to about 800° degrees C. in an ultra-dry, inert gas stream. The ultra-low emission (ULE) carbon material is handled and stored in an environment that minimizes contamination from moisture and other oxygenated species in order to maintain its ppb and sub-ppb impurity removal and low emission properties. The ultra-low emission (ULE) carbon material can be used as “stand-alone” purifier material or in combination with other scavenging materials that are capable of removing large quantities of impurities such as oxygen and moisture that are not removed or only marginally removed by the ultra-low emission (ULE) carbon material.
An ultra-low emission carbon material capable of removing impurities from a gas containing said impurities to produce an ultra-pure gas without concurrently emitting moisture into said gas being purified such that the concentrations of said impurities in said ultra-pure gas product are less than 1 part-per-billion, and wherein said ultra-low emission carbon material is stored in a substantially non-contaminating environment until contacted with said gas containing said impurities.
An ultra-low emission carbon material produced according to the method comprising:
Dependencies are inferred from the claim text.