Waste tire-derived asphalt modifier
AssigneeErgon, Inc.
InventorGaylon L. Baumgardner
Life of this patent
Estimating the term…
Abstract
Products from waste tire pyrolysis are prepared using an initial step of i) at least partially pyrolyzing, separately from such asphaltic binder, whole rubber articles or size-reduced rubber particles to provide one or more pyrolyzed rubber fractions including a pyrolyzed oil fraction having a selected minimum initial boiling point or flash point, and ii) removing some or all polycyclic aromatic hydrocarbon (PAH) compounds from such pyrolyzed oil fraction to provide a reduced-PAH and preferably translucent pyrolyzed oil fraction that may be combined with an asphaltic binder to provide a modified asphalt composition.
Claims24
A pyrolysis oil having reduced polynuclear aromatic hydrocarbon (PAH) content, and made by:
- i) at least partially pyrolyzing whole rubber particles or size-reduced rubber particles to provide one or more pyrolyzed rubber fractions including a pyrolyzed oil fraction having a selected minimum initial boiling point or flash point,
- ii) removing at least some PAH compounds from such pyrolyzed oil fraction having a selected minimum initial boiling point or flash point by one or more of:
- a) fractionally distilling the pyrolyzed oil fraction having a selected minimum initial boiling point or flash point over a temperature range that removes a desired initial boiling point or desired minimum flash point pyrolyzed oil fraction and leaves behind at least some PAH compounds;
- b) solvent extracting the pyrolyzed oil fraction having a selected minimum initial boiling point or flash point using one or more solvents that remove a desired initial boiling point or desired minimum flash point pyrolyzed oil fraction and leave behind at least some PAH compounds;
- c) centrifuging the pyrolyzed oil fraction having a selected minimum initial boiling point or flash point to separate a desired initial boiling point or desired minimum flash point pyrolyzed oil fraction from a fraction containing concentrated PAH compounds;
- or
- d) wiped film evaporating the pyrolyzed oil fraction having a selected minimum initial boiling point or flash point to remove a desired initial boiling point or desired minimum flash point pyrolyzed oil fraction and leave behind at least some PAH compounds,
- to provide a reduced-PAH pyrolyzed oil fraction having a total PAH content less than about 100 ppm by weight.
A method for making pyrolysis oil having reduced polynuclear aromatic hydrocarbon (PAH) content, the method comprising the steps of:
- i) at least partially pyrolyzing whole rubber particles or size-reduced rubber particles to provide one or more pyrolyzed rubber fractions including a pyrolyzed oil fraction having a selected minimum initial boiling point or flash point,
- ii) removing at least some PAH compounds from such pyrolyzed oil fraction having a selected minimum initial boiling point or flash point by one or more of:
- a) fractionally distilling the pyrolyzed oil fraction having a selected minimum initial boiling point or flash point over a temperature range that removes a desired initial boiling point or desired minimum flash point pyrolyzed oil fraction and leaves behind at least some PAH compounds;
- b) solvent extracting the pyrolyzed oil fraction having a selected minimum initial boiling point or flash point using one or more solvents that remove a desired initial boiling point or desired minimum flash point pyrolyzed oil fraction and leave behind at least some PAH compounds;
- c) centrifuging the pyrolyzed oil fraction having a selected minimum initial boiling point or flash point to separate a desired initial boiling point or desired minimum flash point pyrolyzed oil fraction from a fraction containing concentrated PAH compounds;
- or
- d) wiped film evaporating the pyrolyzed oil fraction having a selected minimum initial boiling point or flash point to remove a desired initial boiling point or desired minimum flash point pyrolyzed oil fraction and leave behind at least some PAH compounds;
- to provide a reduced-PAH pyrolyzed oil fraction having a total PAH content less than about 100 ppm by weight.
Dependencies are inferred from the claim text.