Methods for catalytically degrading polyolefin plastics at low temperatures
US12305006B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 2025 |
| Grant date | May 20, 2025 |
| Priority date | — |
| Expiry date | Jan 3, 2045 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for catalytically degrading polyolefin plastics at a low temperature is provided. The method uses NaCl—KCl—AlCl3 molten salt as the catalyst and adds KHCO3 as an additive. Without adding organic solvents, the polyolefin plastics are successfully degraded at a reaction temperature of 90-100° C. The mass recovery rate of degraded polyolefin plastics is more than 99%, and the selectivity of gaseous and liquid products is both more than 90%. The mass recovery rate of the molten salt catalyst was more than 97% after 5 cycles. The molten salt catalysts of the present disclosure can effectively reduce the temperature of the catalytic reaction, and improve its degradation rate and selectivity, solving the technical problems of low conversion efficiency, high cost, and difficulty in catalyst recycling existing in the degradation of the polyolefin plastics, and realizing high efficiency, high selectivity, low cost, and low energy consumption in the polyolefin plastic degradation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.