Process for PVC-containing mixed plastic waste pyrolysis in a reactor handling three phases of products
US11987756B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 2021 |
| Grant date | May 21, 2024 |
| Priority date | — |
| Expiry date | Nov 29, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G2300/4018
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for pyrolysis of a mixed plastic stream that contains polyvinyl chloride (PVC) is provided in which the chloride from PVC is removed from an initial melting reactor that melts the mixed plastic stream. Chloride is removed in a vapor stream from the initial melting reactor with additional chloride removed from addition of sorbents to the pyrolysis reactor and in adsorbent beds downstream of the pyrolysis reactor. The pyrolysis reactor has a configuration comprising two cylindrical ring structures, an inner cylindrical ring structure within an outer cylindrical ring structure wherein a circulation liquid supply stream enters said pyrolysis reactor tangentially relative to a ring edge of said two cylindrical ring structures and wherein solid particles move in a downward direction to a bottom of the pyrolysis reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.