Recovery of asphalt shingle components by solvent extraction
First Claim
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1. A process for treating a solid waste material obtained in a process for manufacturing asphalt shingles and comprised of asphalt and solid components including filler and granules to recover asphalt and said components which comprise:
- (a) shredding said solid waste material(b) introducing said solid waste material into a contact zone;
(c) introducing extraction solvent streams of successively increasing solvent concentrations into said contact zone;
(d) intimately contacting said solid waste material with said extraction solvent for a time sufficient to dissolve said asphalt and form an asphalt-enriched miscella;
(e) separating said asphalt-enriched miscella from solid components; and
(f) separating and recovering by evaporation techniques asphalt and extraction solvent from said asphalt-enriched miscella.
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Abstract
This invention relates to the treatment of a multi-component material to separate and recover the components thereof, and more particularly to the solvent extraction or treatment of waste asphalt shingles to recover, in reusable form, the filler, fiber, granules and like solid components as well as asphalt therefrom.
29 Citations
14 Claims
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1. A process for treating a solid waste material obtained in a process for manufacturing asphalt shingles and comprised of asphalt and solid components including filler and granules to recover asphalt and said components which comprise:
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(a) shredding said solid waste material (b) introducing said solid waste material into a contact zone; (c) introducing extraction solvent streams of successively increasing solvent concentrations into said contact zone; (d) intimately contacting said solid waste material with said extraction solvent for a time sufficient to dissolve said asphalt and form an asphalt-enriched miscella; (e) separating said asphalt-enriched miscella from solid components; and (f) separating and recovering by evaporation techniques asphalt and extraction solvent from said asphalt-enriched miscella. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification