Partially pyrolyzed macroporous polymer particles having multimodal pore distribution with macropores ranging from 50-100,000 angstroms
AssigneeRohm and Haas Company
InventorJames W. Neely
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Abstract
Partially pyrolyzed particles of macroporous resinous polymer have improved structural stability and utility. Pyrolyzed preformed beads are useful as adsorbents in both gaseous and liquid media to remove impurities such as vinylchloride monomer from gases, aromatic compounds such as barbituates from blood, and phenolics from industrial waste streams. Pyrolyzed materials are also useful as catalysts in industrial and laboratory applications due to the controllable surface area and due to a variety of metals, among other things, that may be incorporated into the particles prior to pyrolysis. Preferred adsorbents are prepared from pyrolyzed beads of macroreticular ion exchange resins.
Claims10
Partially pyrolyzed particles of a macroporous synthetic polymer having properties suitable for use in adsorption, molecular screening and/or catalysis and high resistance to crushing and particle sloughage comprising the product of controlled thermal degradation of a macroporous synthetic polymer containing macropores ranging from between about 50 to about 100,000 Angstroms in average critical dimension, a carbon-fixing moiety, and derived from one or more ethylenically unsaturated monomers, or monomers which may be condensed to yield macroporous polymers, or mixtures thereof, which partially pyrolyzed particles have:
- (a) at least 85% by weight of carbon, (b) multimodal pore distribution with macropores ranging in size from about 50 A to about 100,000 A in average critical dimension and (c) a carbon to hydrogen atom ratio of between about 1.5 :
- 1 and about 20 :
- 1.
A process for producing partially pyrolyzed particles of a macroporous synthetic polymer having properties suitable for use in adsorption, molecular separations, and/or catalysis and high resistance to crushing and particle sloughage which comprises thermally degrading at a temperature between about 300.degree. C. and about 900.degree. C. and in an inert gaseous atmosphere optionally containing an activating gas, a macroporous synthetic polymer containing macropores ranging from between about 50 to about 100,000 Angstroms in average critical dimension, a carbon-fixing moiety, and derived from one or more ethylenically unsaturated monomers or monomers which may be condensed to yield macroporous polymers or mixtures thereof for a time sufficient to drive off sufficient volatile components of the synthetic polymer to yield particles having:
- (a) at least 85% by weight of carbon, (b) multimodal pore distribution with macropores ranging in size from about 50 A to about 100,000 A in average critical dimension and (c) a carbon to hydrogen atom ratio of between about 1.5 1;
- 1 and about 20 :
- 1, and thereafter cooling said particles under said inert atmosphere to a temperature below that which would cause oxidation in air.
Dependencies are inferred from the claim text.