Acid resistant PBI membrane for pervaporation dehydration of acidic solvents
AssigneePBI Performance Products, Inc.
InventorsYan Wang, Michael Gruender, Tai-shung Chung
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Abstract
A pervaporation membrane may be an acid-resistant polybenzidimazole (PBI) membrane. The acid-resistant PBI membrane may be a PBI membrane chemically modified by a process selected from the group consisting of sulfonation, phosphonation, cross-linking, N-substitution, and/or combinations thereof. The membrane may be thermally stabilized. A method for the dehydration of an acid material may include the steps of: contacting an acidic aqueous solution with a membrane of an acid-resistant polybenzidimazole; taking away a permeate stream rich in water; and taking away a concentrate steam rich in the acid material. The acidic aqueous solution may be acetic acid.
Claims6
A method for the dehydration of an acid material comprising the steps of:
- contacting an acidic aqueous solution with a membrane comprising an acid-resistant polybenzimidazole (PBI) being a PBI membrane chemically modified by a process selected from the group consisting of sulfonation, phosphonation, N-substitution, and/or combinations thereof, said acid-resistant PBI having a greater resistance to adsorbing an acidic solvent than a same non-acid-resistant PBI;
- taking away a permeate stream rich in water;
- and
- taking away a concentrate stream rich in the acid material.
Dependencies are inferred from the claim text.