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Hydroxyl-terminated polybutadiene/acrylonitrile(HTBN)polymer material was selected for deep desulfurization of liquefied petroleum gas according to the solubility parameter method, and then crosslinked HTBN membranes were prepared,in which asymmetric Polyacrylouitrile(PAN) membranes prepared with phase inversion method acted as the microporous supporting layer in the flat-plate composite membrane.