Optimization methods for processing plastic pyrolysis oils to improve their use

The method purifies plastic pyrolysis oil by selective hydrogenation and hydrogenation treatment to address impurity-related issues, enhancing its suitability for steam cracking units and increasing light olefin yield.

JP7875808B2Inactive Publication Date: 2026-06-18IFP ENERGIES NOUVELLES
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
IFP ENERGIES NOUVELLES
Filing Date
2021-02-15
Publication Date
2026-06-18
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Plastic pyrolysis oils contain high levels of impurities such as olefins, metals, and halogens, which cause corrosion, coking, and catalyst deactivation in steam cracking units, limiting their use and yield of light olefins.

Method used

A method involving selective hydrogenation, hydrogenation treatment, separation, and optional fractionation stages to purify plastic pyrolysis oil, reducing impurities and making it suitable for steam cracking units.

Benefits of technology

The method effectively removes impurities, reducing the risk of corrosion and coking, and increases the yield of light olefins, enabling the oil to be upgraded for use in naphtha or diesel pools and as feedstock for steam cracking units.

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Abstract

The present invention relates to a method for treating plastic pyrolysis oil, the method comprising: a) treating the plastic pyrolysis oil in the presence of at least hydrogen and at least one selective hydrogenation catalyst at a temperature of 100 to 150°C, a hydrogen partial pressure of 1.0 to 10.0 absolute MPa, and 1.0 to 10.0 h -1 a) selective hydrogenation of the feedstock to obtain a hydrogen effluent at an hourly space velocity of 0.1 to 10.0 h; b) selective hydrogenation of the feedstock to obtain a hydrogen effluent at a temperature of 250 to 370 °C, a hydrogen partial pressure of 1.0 to 10.0 MPa absolute and a time of 0.1 to 10.0 h in the presence of at least hydrogen and at least one hydrotreating catalyst. -1 to obtain a hydrotreated effluent; c) separating the hydrotreated effluent in the presence of an aqueous stream at a temperature of from 50 to 370°C to obtain at least one gaseous effluent, at least one aqueous liquid effluent, and at least one liquid hydrocarbon effluent; e) recycling at least one fraction of the products obtained.
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