Method for preparing low-freezing-point biodiesel and aviation fuel through selective isomerization

Through the selective isomer preparation method and the dual-function catalyst HPA@SiO2 performing hydrodeoxygenation and isomerization reactions in a fixed bed reactor, the problems of complex production processes and low conversion rates of biodiesel and aviation fuel are solved, and efficient and stable production of low-condensation biodiesel and aviation fuel are achieved, which is suitable for industrial applications.

CN119875686APending Publication Date: 2025-04-25FUZHOU UNIV
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Patent Information

Application Number
CN202510316070.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-18
Publication Date
2025-04-25

AI Technical Summary

Technical Problem

The existing biodiesel and aviation fuel production process is complex, the conversion rate is low, the catalyst is prone to deactivate, the operating conditions are harsh, and the long-term and stable operation cannot be operated.

Method used

The selective isomerization preparation method is adopted, and the hydrogenation and isomerization reaction is carried out in a fixed bed reactor using the dual-function catalyst HPA@SiO2, combined with alcohol, liquid acid catalyst and vulcanizing agent, and the recyclable vulcanized phase particles are formed through pre-esterification, water washing, hydrodeoxygenation and isomerization steps, which simplifies the process flow.

Benefits of technology

It realizes efficient and stable production of low-condensation biodiesel and aviation fuel. The catalyst can be recycled, the process is simple, and the raw materials are widely applicable. The production process does not require parking to replace the catalyst. It has a high conversion rate and is easy to industrialize.

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Abstract

The invention discloses a method for preparing low-freezing-point biodiesel and aviation fuel through selective isomerization. The method comprises the following steps: 1) waste oil passes through a filter and then enters a pre-esterification reactor together with alcohol and a liquid acid catalyst; 2) introducing the pre-esterified mixture into a liquid-liquid separator, separating out alcohol by a flash separator, and recovering the liquid acid catalyst to obtain a pre-esterified product I; 3) mixing the pre-esterification product I with a vulcanizing agent, hydrogen and HPA coated SiO2, and carrying out hydrogenation to obtain a product II; 4) processing the product II through a gas-liquid-solid separator to obtain a gas phase, a liquid phase and a solid phase, and circulating a solid-phase catalyst; and 5) feeding the gas phase into a pressure swing adsorption tower to remove low-carbon hydrocarbon, CO and CO2, then returning to the fixed bed reactor for hydrogen circulation, and feeding the liquid phase into a fractionator to obtain a final product. The low-freezing-point biodiesel and the aviation fuel are prepared on the basis of the waste oil and fat, long-term stable proceeding of the process is guaranteed, and meanwhile the method has the advantages of being wide in raw oil range, wide in catalyst application range and high in conversion rate.
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