Method for preparing high-quality tire oil through catalytic cracking of waste tires

By using low-temperature phase change medium catalytic cracking and medium regeneration technology, the problems of high energy consumption and poor oil quality in waste tire pyrolysis have been solved, achieving the production of high-quality tire oil with low sulfur content and high yield, and the catalyst can be recycled.

CN122234835APending Publication Date: 2026-06-19YUANPING YEHUAN RENEWABLE RESOURCES COMPREHENSIVE UTILIZATION CO LTD
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Patent Information

Application Number
CN202610583460.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-29
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing waste tire pyrolysis processes suffer from high energy consumption, poor product oil quality, high sulfur content, and unsustainable use of catalytic media.

Method used

Catalytic cracking is carried out using a low-temperature phase change medium (a eutectic solvent formed by choline chloride and ferric chloride hexahydrate). The cracking and desulfurization reaction is carried out at 200-240℃, and iron ions are used to capture sulfur to generate inorganic sulfides. The medium is then regenerated under air oxidation, thereby realizing sulfur recovery and recycling of the medium.

Benefits of technology

It significantly reduces pyrolysis temperature, reduces equipment coking, increases liquid oil yield, obtains high-quality tire oil with low sulfur content, reduces energy consumption, and enables the sustainable use of catalysts.

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Abstract

The invention discloses a method for preparing high-quality tire oil through catalytic cracking of waste tires. According to the method, a eutectic solvent formed by choline chloride and ferric trichloride hexahydrate is used as a low-temperature phase change medium, and the low-temperature phase change medium has four functions of a heat carrier, a swelling agent, a catalyst and a sulfur trapping agent. The method comprises the following steps: mixing waste tire rubber powder with the medium, carrying out low-temperature swelling and cracking desulfurization reaction in an inert atmosphere, preferentially breaking C-S bonds and S-S bonds in rubber cross-linking bonds by utilizing Lewis acidity of iron ions in the medium, capturing sulfur-containing active species generated by breaking into inorganic sulfide in situ, and keeping the inorganic sulfide in a liquid phase, and the escaped oil gas is condensed to directly obtain ultra-low-sulfur, light-color and transparent high-quality tire oil. The used medium can be oxidized and regenerated by introducing air under a heating condition, sulfur is recovered in the form of elemental sulfur, and the medium is recycled. The method realizes cooperation and unification of low-temperature cracking and source deep desulfurization, and is simple in process flow, economical and environment-friendly.
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