Process for the selective hydrodechlorination of pyrolysis oil

By using dechlorinating agents composed of alkaline earth metal oxides and transition metal active components, the decomposition of organochlorides and the solidification of chlorine elements are catalyzed during the hydrorefining of cracked oil, solving the problems of equipment blockage and corrosion, simplifying the process and reducing costs, and improving safety and stability.

CN122278512BActive Publication Date: 2026-07-24DONGYING GUANKAI NEW ENERGY CO LTD
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Patent Information

Application Number
CN202610756156.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-05-29
Publication Date
2026-07-24
Estimated Expiration
2046-05-29

AI Technical Summary

Technical Problem

Existing technologies in the hydrorefining of cracked oil suffer from equipment blockage and corrosion caused by organochlorides, resulting in complex processes, high costs, and difficulty in effectively preventing the formation and deposition of ammonium chloride.

Method used

A dechlorination agent with a specific composition, containing alkaline earth metal oxides and transition metal active components, is used to catalyze the breaking of the C-Cl bond in organochlorines under hydrogen-exposed conditions and generate stable metal chlorides in situ on the catalyst surface, thereby fixing chlorine and preventing the generation of gaseous HCl.

Benefits of technology

Simplify the process flow, reduce equipment investment and operating costs, reduce hydrogen consumption, avoid equipment corrosion and blockage, improve the safety and operational stability of the unit, and extend catalyst life.

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Abstract

The application discloses a process for selectively removing chlorine from pyrolysis oil in the presence of hydrogen, and belongs to the technical field of heavy oil processing and refining. The process comprises the following steps: pressurizing and heating raw pyrolysis oil to 250-350 DEG C, mixing the pyrolysis oil with hydrogen, and then feeding the mixture into a fixed-bed dechlorination reactor filled with a specific dechlorination agent; and performing a reaction under a pressure of 2.5-3.0 MPa, so that organic chlorides in the pyrolysis oil are selectively converted and fixed on the dechlorination agent, while organic sulfur, basic nitrogen and other impurities basically do not undergo hydrogenation reactions. After the reaction product is cooled and gas-liquid separation, dechlorination pyrolysis oil with a chlorine content of less than 10 mu g / g is obtained, which can be directly used for subsequent hydrofining. The application solves the problem of removing organic chlorine before the pyrolysis oil is subjected to hydrofining, and through selective dechlorination, the problem of equipment corrosion caused by the generation of hydrogen chloride in subsequent sections is avoided, and the consumption of invalid hydrogen is reduced, so that the process flow is simple and economic.
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