Method for hydrogenating nitrile rubber, and hydrogenated nitrile rubber

By using nickel and cobalt-supported non-precious metal catalysts to carry out the hydrogenation reaction of nitrile rubber, the problems of high catalyst cost and wide molecular weight distribution are solved, and efficient and low-cost hydrogenated nitrile rubber production is achieved, improving product quality and catalysts stability.

CN119176907APending Publication Date: 2024-12-24CHINA PETROLEUM & CHEMICAL CORP +2
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Patent Information

Application Number
CN202410807406.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-06-21
Filing Date
2024-06-21
Publication Date
2024-12-24

AI Technical Summary

Technical Problem

In the existing nitrile rubber hydrogenation methods, the high catalyst cost, large amount of use, and obvious breakage of polymer molecular chains lead to a wide molecular weight distribution, and the hydrogenation conditions are harsh, affecting product quality.

Method used

Using a supported non-precious metal catalyst, the active metal components are nickel and/or cobalt. By fixing on the support and using it to catalyze the hydrogenation reaction of nitrile rubber, high selectivity, high efficiency hydrogenation, efficient separation of catalyst and product, and Reduce production costs.

Benefits of technology

Hydrogenated nitrile rubber with low cost, small catalyst dosage, narrow product molecular weight distribution, adjustable and high hydrogenation degree is achieved, improving product quality and maintaining catalyst stability under high stirring reaction conditions.

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Abstract

The present invention discloses a nitrile rubber hydrogenation method, which comprises that nitrile rubber contacts hydrogen gas in the presence of a catalyst to carry out a hydrogenation reaction so as to obtain hydrogenated nitrile rubber, wherein the catalyst is a supported non-noble metal catalyst. The hydrogenation degree of the hydrogenated butadiene-acrylonitrile rubber obtained by the hydrogenation method can be greater than 95%, high selectivity and efficient hydrogenation of the butadiene-acrylonitrile rubber, efficient separation of the catalyst and the hydrogenation product and recycling of the catalyst can be realized, the synthesized butadiene-acrylonitrile rubber has the number-average molecular weight of 20,000-200,000 and the molecular weight distribution of less than or equal to 2.3, and the production cost is greatly reduced.
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Citation Information

Patent Citations

  • Hydrogenated butadiene-acrylonitrile rubber preparation method

    CN104140479A

  • Preparation and application method of selective heterogeneous solution hydrogenation catalyst of nitrile-butadiene rubber (NBR)

    CN107308985A

  • Preparation method of nitrile butadiene rubber selective hydrogenation supported catalyst, and hydrogenation process thereof

    CN109569694A

  • Nitrile rubber hydrogenation intercalated hydrotalcite catalyst and preparation method and application thereof

    CN114832843A

  • Catalytic hydrogenation of nitrile rubber

    US5241013A