Two-Step Membrane Gas Separation Process
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United States of America Patent
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Issued Date -
May 14, 2015
app pub date -
Nov 8, 2013
filing date -
Nov 8, 2013
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Abandoned
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Abstract
A gas separation process for treating a gas stream containing vapors of condensable components. The process includes two membrane separation steps, the second step using membranes of lower selectivity than the first step. Advantageously, the first membrane separation step may be carried out outside the pressure-ratio-limited region and the second membrane separation step may be carried out within the pressure-ratio-limited region. The second residue stream is a desired product of the process, and the process is particularly useful for applications where the target concentration of component A in this product is low, such as below 1-2 vol %.
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