Removing siloxanes from a gas using a segmented filtration...

Gas separation: processes – With control responsive to sensed condition – Concentration sensed

Reexamination Certificate

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C095S011000, C095S141000, C095S147000, C095S148000, C095S901000, C095S903000, C096S111000, C096S121000, C096S131000, C096S143000, C096S146000, C096S154000

Reexamination Certificate

active

10871920

ABSTRACT:
A plurality of different layers of filter media are used to remove siloxanes from a gas stream. Based on an analysis of the specific gas stream to be filtered, a filter media having an average pore size enabling the preferential removal of a specific class of contaminants is selected for each different class of contaminants. The layers are arranged in sequential order such that contaminants having a higher molecular weight are preferentially removed by the first layers. Collectively, the layers define a segmented activity gradient that enables each class of contaminants present in the gas stream to be preferentially removed in a different layer, preventing removal competition between different classes of contaminants. A polymorphous graphite is used as the filter media, because that material is available in a range of well-controlled pore sizes, as opposed to conventional activated carbon filter media, which generally exhibits poorly-controlled pore sizes.

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