High surface area adsorbents and methods of preparation
AssigneeRohm and Haas Company
InventorsEric Gustave Lundquist, Eric Jon Langenmayr
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Abstract
A process for the preparation of high surface area, low-swelling macroporous polymeric adsorbents is disclosed. The use of organic sulfonic acids to provide postcrosslinking of macroporous copolymers eliminates the need for traditional organic swelling solvents and Lewis-acid catalysts used to provide conventional macronetted polymers. In particular, methanesulfonic acid provides macroporous polymeric adsorbents having high surface area and porosity, low levels of residual vinyl groups, and free of residual contaminants from conventional Lewis-acid/Friedel-Crafts reactions.
Claims5
A method for preparing a high surface area, low-swelling macroporous polymeric adsorbent comprising:
- (a) contacting one or more macroporous cross-linked polyvinylaromatic copolymer comprising 50 to 100 weight percent polyvinylaromatic monomer units, and having at least 1.0 millimole residual vinyl groups per gram copolymer, with at least 5 weight percent of one or more organic sulfonic acid, based on total weight of the macroporous copolymer, to form a copolymer-acid mixture;
- (b) maintaining temperature of the copolymer-acid mixture between 20 and 140.degree. C. for at least 30 minutes;
- and
- (c) removing the organic sulfonic acid from the copolymer-acid mixture and isolating the macroporous adsorbent.
Dependencies are inferred from the claim text.