Patent · US Active

System for use of land fills and recyclable materials

US7478542B2 · kind B2 · utility

4Cited by

30References

18Claims

0Family size

Inventors

Jon Wikstrom · Eagan, US
Dan Schiller · Woodbury, US
Jon R. Turner · Lakeville, US

Key dates

Filing date	Sep 6, 2005
Grant date	Jan 20, 2009
Priority date	—
Expiry date	Oct 21, 2026

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2495
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Gases are vented from a waste site such as a landfill, and the gases are separated into at least three streams comprising a hydrocarbon stream, a carbon dioxide stream, and residue stream. At least a portion of the carbon dioxide stream and hydrocarbon stream are liquefied or converted to a supercritical liquid. At least some of the carbon dioxide gas stream (as a liquid or supercritical fluid) is used in a cleaning step, preferably a polymer cleaning step, and more preferably a polymer cleaning step in a polymer recycling process, and most preferably in a polymer cleaning step in a polymer recycling system where the cleaning is performed on-site at the waste site.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.