Materials, methods, and devices for siloxane contaminant removal
AssigneeDonaldson Comapany, Inc.
InventorsBrian N. Hoang, Gerald Weineck, Karthik Viswanathan, Andrew J. Dallas
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Abstract
Adsorbent materials are disclosed, along with filter elements containing the adsorbent materials methods of using adsorbents to remove siloxane contaminants from a gas stream. The method includes providing an adsorbent material that has been washed with an acid and passing a gas through the adsorbent material so as to reduce siloxane levels in the gas. A filter element for reducing siloxane levels in a gas includes a first adsorbent material, the first adsorbent material comprising an acid-washed adsorbent; and a second adsorbent material, the second adsorbent material comprising an acid-impregnated adsorbent.
Claims17
A method of reducing siloxane levels in a gas, the method comprising:
- providing a first adsorbent material comprising activated carbon that has been washed with an acid;
- passing a gas through the first adsorbent material so as to reduce siloxane levels in the gas;
- providing a second adsorbent material comprising activated carbon impregnated with phosphoric acid;
- and
- passing the gas through the second adsorbent material.
A filter element for reducing siloxane levels in a gas, the filter element comprising:
- a first adsorbent material, the first adsorbent material comprising an activated carbon that has been acid-washed;
- and
- a second adsorbent material, the second adsorbent material comprising an activated carbon impregnated with phosphoric acid.
A filtration system for reducing siloxane levels in a gas, the filtration system comprising:
- a first filter element comprising a first adsorbent material, the first adsorbent material comprising an activated carbon that has been acid-washed;
- a second filter element comprising a second adsorbent material, the second adsorbent material comprising an activated carbon impregnated with phosphoric acid;
- and
- wherein the filter system is configured in a series for a majority of the gas to pass through the first filter element and the second filter element.
Dependencies are inferred from the claim text.