Halogen-resistant media
AssigneeSaint-Gobain Norpro Corporation
InventorsJohn S. Reid, Thomas Szymanski, Karen C. Beal
Life of this patent
Estimating the term…
Abstract
Ceramic mass transfer media suitable for use in thermal regenerative oxidizers made using a mixture of a clay, talc and optionally a dolomitic limestone have enhanced resistance to environments containing halogens and hydrogen halides.
Claims11
Ceramic media comprising less than 0.25% by weight of alkali metal, measured as the oxide, formed from a fired mixture comprises 10-98% by weight of a clay having an alumina content of at least 36% by weight;
- from 2 to 90% by weight of a talc containing at least 95% by weight of magnesium silicate as, determined by X-ray diffraction analysis;
- and from 0-10% by weight of a dolomitic limestone containing 60-90% by weight of calcium carbonate and 10-40% by weight of magnesium carbonate and 10% to 40% by weight of magnesium carbonate and less than 10% of non-carbonate impurities, the ceramic media having a water absorption of 7.6%-12.6%.
Ceramic media comprising less than 0.25% by weight of alkali metal, measured as the oxide, formed from a fired mixture comprising 10-98% by weight of a clay having an alumina content of at least 36% by weight;
- from 2 to 90% by weight of a talc containing at least 95% by weight of magnesium silicate as determined by X-ray diffraction analysis;
- and from 0-10% by weight of a dolomitic limestone containing 60-90% by weight of calcium carbonate and 10-40% by weight of magnesium carbonate and 10% to 40% by weight of magnesium carbonate and less than 10% of non-carbonate impurities, the ceramic media having a water, absorption of 7.6%-12.6%, in which the alkali metal includes sodium at a concentration of up to 0.03%, measured as the oxide, as measured by atomic absorption spectroscopy.
Ceramic media comprising less than 0.25% by weight of alkali metal, measured as the oxide, formed from a fired mixture comprising 10-98% by weight of a clay having an alumina content of at least 36% by weight;
- from 2 to 90% by weight of a talc containing at least 95% by weight of magnesium silicate as determined by X-ray diffraction analysis;
- and from 0-10% by weight of a dolomitic limestone containing 60-90% by weight of calcium carbonate and 10-40% by weight of magnesium carbonate and 10% to 40% by weight of magnesium carbonate and less than 10% of non-carbonate impurities, the ceramic media having a water absorption of 76%-12.6%, in which the alkali metal includes potassium at a concentration of 0.05%, measured as the oxide, as measured by atomic absorption spectroscopy.
Dependencies are inferred from the claim text.