A dual-catalysis quality increasing method and system for continuous oil production by catalytic cracking of waste plastics

By using a dual-catalyst system for synergistic temperature and pressure control, the problems of unstable products and low equipment availability in the catalytic cracking of waste plastics to produce oil have been solved, thus achieving improved oil quality and safe, continuous production.

CN122128006APending Publication Date: 2026-06-02ZHEJIANG GUOSU ENVIRONMENTAL PROTECTION GRP CO LTD
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Patent Information

Application Number
CN202610348675.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-20
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing technologies for catalytic cracking of waste plastics to produce oil suffer from problems such as unstable product composition, limited improvement in oil quality, low equipment availability, and insufficient safety. In particular, it is difficult to achieve efficient and stable oil and gas treatment and equipment operation in continuous production.

Method used

A dual-catalyst system is adopted, with acidic earth catalyst A used in the front end and molecular sieve metal ion catalyst B used in the back end in parallel switching. Through coordinated temperature and pressure control, catalytic cracking and filtration enhancement are achieved, ensuring the stability and safe and continuous operation of oil and gas.

Benefits of technology

It improved the stability of oil quality, reduced the content of heavy fractions and unsaturated components, enhanced the continuous availability and safety of the unit, and ensured the stable operation of the system.

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Abstract

This invention belongs to the field of environmental protection technology and discloses a dual-catalytic enhancement method and system for continuous oil production from waste plastics via catalytic cracking. Waste plastics are crushed and mixed with catalyst A, which is composed of montmorillonite, albite, and quartz in a mass ratio of 1:1:1. After melting and plasticizing, the mixture enters a membrane cracking reactor, where it is cracked to generate oil and gas. The oil and gas are introduced into a filtration and separation enhancement section, passing through a catalytic filter bed filled with catalyst B in two switchable parallel flow paths. Catalyst B consists of solid spheres with a molecular sieve structure and a diameter of 6-13 mm, loaded with trace amounts of rare metal ions. The temperature of the enhancement section is controlled at 300-450℃, at least 20℃ lower than the cracking temperature, and the pressure is -5kPa to 0. Subsequently, the cracked oil and non-condensable gas are separated by condensation, and solid residue is discharged. This invention allows for non-stop switching and maintenance, balancing oil yield and oil product stability.
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Citation Information

Patent Citations

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