A method for the preparation of pentaerythritol oleate based on sodium bisulfite

By using sodium bisulfite (NaHSO3) as a catalyst and antioxidant, combined with extraction and thin-film evaporation technologies, the problems of color difference and equipment corrosion in the preparation of pentaerythritol oleate were solved, achieving efficient and low-cost green synthesis.

CN122233906APending Publication Date: 2026-06-19湖北宜化化工科技研发有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
湖北宜化化工科技研发有限公司
Filing Date
2026-03-24
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing technologies for preparing pentaerythritol oleate produce products with poor color, and traditional catalysts suffer from equipment corrosion, oxidation side reactions, and high energy consumption. Furthermore, there is a lack of auxiliaries that combine catalytic and antioxidant functions, resulting in complex and costly production processes.

Method used

Sodium bisulfite (NaHSO3) was used as an auxiliary agent, which has both catalytic and antioxidant functions. Pentaerythritol oleate was prepared by esterification reaction, and purified by extraction and thin-film evaporation technology to avoid the need for additional antioxidants.

Benefits of technology

It achieves a highly efficient catalytic reaction, avoids product color deepening, simplifies the process, reduces production costs, and yields high-quality pentaerythritol oleate, suitable for industrial production.

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Abstract

This invention discloses a method for preparing pentaerythritol oleate based on sodium bisulfite. The method involves the esterification reaction of pentaerythritol and oleic acid with sodium bisulfite as an auxiliary agent. Sodium bisulfite, as an auxiliary agent, possesses both catalytic and antioxidant functions, effectively improving the reaction rate and product yield while suppressing oxidation side reactions. This eliminates the need for additional antioxidants, improving product quality and reducing costs. The preparation method is simple, mild, and environmentally friendly, with readily available raw materials, low-cost auxiliary agents, and easy separation. After the reaction, the catalyst is removed by hot filtration, and unreacted oleic acid is removed by solvent extraction, effectively reducing the product's acid value. The extracted potassium oleate byproduct has a purity of 80%–90% and can be used as a flotation agent, release agent, or raw material for lubricant production, making it suitable for industrial applications. The resulting pentaerythritol oil is suitable for high-end lubricants, bio-based plasticizers, and environmentally friendly coatings.
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