A process for removing oxygenates from fischer-tropsch naphtha

By employing a combined reaction-extraction-adsorption process and using a composite extraction solvent of esters and glycols, the problem of separating oxygen-containing compounds such as ketones and aldehydes in Fischer-Tropsch synthesis oils has been solved, achieving efficient removal and high recovery rates while maintaining olefin content. The catalyst can be reused.

CN118006361BActive Publication Date: 2026-04-28CHINA ENERGY INVESTMENT CORP LTD +1
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Patent Information

Application Number
CN202211395426.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-09
Publication Date
2026-04-28
Estimated Expiration
2042-11-09

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively remove oxygen-containing compounds such as ketones and aldehydes from Fischer-Tropsch synthesis oils, leading to catalyst poisoning and deactivation, increasing costs in downstream industries, and existing methods are either complex or inefficient.

Method used

A combined reaction-extraction-adsorption process is employed, using a composite extraction solvent of esters and glycols to react with Fischer-Tropsch naphtha in the presence of a catalyst. After standing and separation, countercurrent extraction, solvent recovery, and water washing are performed, and the extractant is recycled to achieve efficient separation of ketones, aldehydes, alcohols, and esters.

Benefits of technology

It effectively reduces the oxygen content in Fischer-Tropsch synthetic oil to below 5 ppm, maintains the α-olefin content, achieves an oil recovery rate of over 95%, and allows the catalyst to be reused.

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Abstract

The application provides a method for removing oxygen-containing compounds from Fischer-Tropsch naphtha, which comprises the following steps: (1) reacting Fischer-Tropsch naphtha, a catalyst, isopropyl alcohol and glycol in a stirring reactor, and then standing and separating; (2) extracting the upper hydrocarbon phase after standing with an extractant to obtain an extraction phase and a raffinate phase; (3) recovering the solvent in a solvent recovery column, obtaining oxygen-containing compounds at the top of the column, and recycling the solvent obtained at the bottom of the column as the extractant; (4) washing the raffinate phase with water to obtain Fischer-Tropsch naphtha from which the oxygen-containing compounds are removed and washed water, recycling the washed water to the water washing column for water washing, and recycling the product at the bottom of the water recovery column as the extractant; the extractant is a mixture of ester compounds and glycol compounds, and the content of the glycol compounds is 40-70%; and the method can reduce the oxygen-containing compounds in the Fischer-Tropsch naphtha to 5 ppm, and the oil recovery rate reaches more than 95%.
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