Process for recovering carbon black and hydrocarbons from used tires
US4250158A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1978 |
| Grant date | Feb 10, 1981 |
| Priority date | — |
| Expiry date | Feb 15, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention is a process for economically recovering carbon black, tar, oil and fuel gas from used tires. Used tires are physically sliced and fragmented. The fragments are pyrolized in an oxygen-limited, hydrocarbon vapor at subatmospheric pressure while being refluxed with process tar condensate. Vapor phase products of the pyrolysis are fractionated into tar, oil and fuel gas. The fuel gas can be compressed and burnt to provide process heat. Solid phase pyrolysis products are stripped of trash and milled to carbon black in an air swept roller mill. Carbon black is mechanically separated from the effluent air stream of the roller mill and formed into pellets that are dried in a series multi-stage fluid bed dryer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.