Modified sophorolipid surfactant and method for preparing the same

CN122167501APending Publication Date: 2026-06-09CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-12-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing biosurfactants suffer from insufficient stability, low salt resistance, and poor adaptability in oil extraction, which limits their application effectiveness in different blocks.

Method used

A modified sophorolipid surfactant was prepared by Borch reduction amination in a weakly acidic solvent, followed by quaternization in a weakly alkaline environment, and then etherification with sophorolipid under alkaline conditions. Alkyl and sulfonic acid groups were introduced to enhance its hydrophilicity and lipophilicity.

Benefits of technology

Modified sophorolipid surfactants have a lower critical micelle concentration, significantly improve surface and interfacial activity, exhibit excellent temperature and salt resistance, and can significantly reduce surface and interfacial tension, resulting in a significant reduction in the viscosity of heavy oils.

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Abstract

This invention belongs to the field of petroleum extraction technology, specifically relating to a modified sophorolipid surfactant and its preparation method. The preparation method includes: in a weakly acidic solvent, under the action of a reducing agent, sodium benzaldehyde-2,4-disulfonate and a secondary amine undergo a Borch reduction amination reaction to obtain a sulfonated tertiary amine salt; next, in a weakly alkaline environment, the sulfonated tertiary amine salt undergoes a quaternization reaction with epoxy halopropane to obtain an etherifying agent; and finally, under alkaline conditions, the etherifying agent undergoes an etherification reaction with sophorolipid ester to obtain the modified sophorolipid surfactant. The modified sophorolipid surfactant of this invention has the advantages of simple synthesis process, high interfacial activity, and good crude oil viscosity reduction effect.
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