Conversion of waste rubber to fuel and other useful products
US3996022A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1975 |
| Grant date | Dec 7, 1976 |
| Priority date | — |
| Expiry date | Jan 31, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/143
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Heretofore waste rubber, a substantial amount of it in the form of used automobile tires, has been buried, burned, or otherwise disposed of in manners and by means totally inconsistent with good ecological practices and considerations. Now, such waste or scrap rubber, both natural and synthetic, can readily be converted in the presence of molten acidic halide Lewis salt catalysts to useful products, including fuels comprising a naptha-like oil, a burnable solid carbonaceous material, and a mixture of gases. The most promising salts are zinc chloride, tin chloride, and antimony iodide. Also, an extremely active catalyst can be prepared by adding up to about 60 percent by weight of sodium chloride to the zinc chloride catalyst. The burnable carbonaceous material has been shown to be a carbon black of moderate quality and is believed to be suitable for reuse in tires if blended with high-quality fresh carbon black.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.