Abstract:

The selective hydrogenation of nitrile butadiene rubber (NBR) is an important process for the preparation of high value-added, high-performance hydrogenated NBR (HNBR). The C\stackrel{}{̿}C double bonds in the chain segment are hydrogenated while the nitrile group is unaffected, which can not only maintain its original oil resistance and wear resistance, but also greatly improve its weather resistance and ozone resistance. This article introduces several processes of NBR hydrogenation and emphatically reviewed the research progress and development direction of NBR heterogeneous catalytic hydrogenation. The effects of pore structure, surface properties and the active components of the supported catalyst on the hydrogenation performance of NBR is discussed. Additionally, the solvent effect, and the recovery and regeneration of catalyst in the heterogeneous hydrogenation process are summarized. It is proposed that solvent has an important influence on the catalytic hydrogenation rate and hydrogenation degree, and the hydrogen bond acceptance ability (β value) of solvent is the key factor affecting the hydrogenation performance. The main cause of catalyst deactivation is the coverage of the surface active sites by polymer, and washing with the effective solvent or modification of catalyst surface can expose the active sites again, thereby restoring the hydrogenation activity. Finally, the future research directions of heterogeneous catalytic hydrogenation for high value-added HNBR, including catalyst design, solvent effect and catalyst regeneration, are prospected.

Key words: nitrile butadiene rubber, hydrogenation, catalyst, solvents, recovery

摘要：

丁腈橡胶（NBR）选择性催化加氢是制备高附加值、高性能氢化丁腈橡胶（HNBR）的一个重要过程。将链段中C\stackrel{}{̿}C双键加氢饱和而保留氰基基团，不仅可保持其原有的耐油性和耐磨性，而且可极大地改善其耐侯性、耐臭氧性等。本文介绍了NBR加氢的几种工艺，着重综述了NBR非均相催化加氢的研究进展及发展方向，探讨了负载型催化剂的载体孔道结构和表面性质及活性组分组成对NBR加氢性能的影响。本文还对非均相催化加氢过程中的溶剂效应、催化剂的回收和循环再生进行了阐述，提出溶剂对催化加氢速率和加氢度都有重要影响，溶剂的受氢能力（β值）是影响加氢过程的关键参数。催化剂失活的主要原因是表面活性位点被聚合物覆盖，而利用有效的溶剂洗涤或者采用催化剂表面功能化的方式，可促使活性位再次暴露，恢复其加氢活性。最后，对非均相加氢制备高附加值HNBR体系中的催化剂设计、溶剂效应和催化剂再生等发展方向进行了展望。

关键词: 丁腈橡胶, 加氢, 催化剂, 溶剂, 回收