Road asphalt composition
AssigneeMarathon Oil Company
InventorMark A. Plummer
Life of this patent
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Abstract
Asphalt used for road paving containing catalytic cracking catalyst particles which have been burned to remove hydrocarbons deposited thereon during a petroleum catalytic cracking process. The catalyst particles may be present in the asphalt in amounts of from 0.1% to 5.0% by weight of the asphalt, but more preferably from 0.2% to 2.0% by weight of the asphalt. The particles, which are comprised of crystalline and amorphous silica and alumina and silica-alumina combinations, function to prevent oxidative condensation of the asphalt, thus preventing hardening of the asphalt.
Claims20
An asphalt composition for use as a road asphalt, comprising in combination with asphalt, particles of petroleum catalytic cracking catalyst present substantially uniformly throughout the asphalt in amounts, by weight of the asphalt, in the range of 0.1% to 5.0%.
An asphalt-based road paving mixture, comprising a substantially uniform mixture of asphalt, aggregate, filler and particles of petroleum cracking catalyst, the particles of catalyst being present in amounts, by weight of the asphalt, of 0.1% to 5.0%.
A method of producing an asphalt-based road paving mixture including asphalt and aggregate, comprising the steps of:
- burning off hydrocarbons from catalytic cracking catalyst particles which have been used in a fluid catalytic cracking process;
- and
- including the catalyst particles in the asphalt-based road paving mixture, the particles being present substantially uniformly throughout the mixture in amounts, by weight of the asphalt, of 0.1% to 5.0%.
Dependencies are inferred from the claim text.