Ultrasonic Deposition of High-Selectivity Nanoporous Carbon Membranes

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Abstract
Ultrasonic deposition creates a thin film of polymer on a tubular, macroporous, stainless steel support. Using polyfurfuryl alcohol as the nanoporous carbon precursor and a pyrolysis temperature of 723 kelvin, a membrane was prepared with the following permeances, measured in moles per square meter per Pascal per second: nitrogen, 1.8 × 10−12; oxygen, 5.6 × 10−11; helium, 3.3 × 10−10; and hydrogen, 6.1 × 10−10. The ideal separation factors as compared to that for nitrogen are 30:1, 178:1, and 331:1 for oxygen, helium, and hydrogen, respectively.