A preparation method of o-hydroxybenzonitrile

Through the synergistic effect of the palladium manganese catalyst supported on hydrotalcite and the 1,4-dioxane aqueous solution, the problems of large wastewater volume, complexity and low yield in the preparation of o-hydroxybenzonitrile were solved, and an efficient and environmentally friendly o-hydroxybenzonitrile preparation process was achieved with high product purity and yield.

CN118026890BActive Publication Date: 2025-09-09PUYANG YUANDONG CHEM
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Patent Information

Application Number
CN202410166845.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-02-06
Publication Date
2025-09-09
Estimated Expiration
2044-02-06

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Abstract

The invention discloses a preparation method of o-hydroxybenzonitrile, belongs to the technical field of fine chemical material preparation, and the present invention uses a palladium manganese catalyst, o-chlorobenzonitrile and 1,4-dioxane aqueous solution supported on hydrotalcite as raw materials, and the three are reacted to prepare o-hydroxybenzonitrile. The product selectivity prepared by the present invention using this method is high in yield, the process is simple and easy, the whole process is free of waste and avoids the use of alkaline additives, and is green and environmentally friendly. The catalyst used in the present invention is a palladium manganese catalyst supported on a hydrotalcite support, and the basic sites of the catalyst support and palladium manganese have a synergistic effect, and there is also a synergistic effect between palladium metal and manganese metal; the catalyst is made to have a higher catalytic activity. In addition, the hydrotalcite support interlayer structure makes the metal elements of the load evenly dispersed, so that the catalyst has a higher stability.
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Citation Information

Patent Citations

  • Preparation method of o(p)-hydroxybenzonitrile

    CN102311364A

  • Hydrotalcite-supported palladium-based alloy catalyst and preparation method thereof

    CN108465472A