Remove Rhodium Catalysts from HNBR Solution

Abstract:

Rhodium complex is excellent catalyst for nitrile-butadiene rubber homogeneous hydrogenation with difficulties in its recovery. A new extraction method for recovery noble metal catalysts from hydrogenated nitrile-butadiene rubber solution was investigated. Rhodium metal catalysts can be efficiently, easily removed from hydrogenated nitrile-butadiene rubber solution using amine as ligand and hydrogen peroxide as oxidant. The condition of removing noble metal catalysts from hydrogenated nitrile-butadiene rubber solution was carefully studied, including oxidant, reaction temperature, and the concentration of amine. The removal rate of the rhodium catalyst over 96% with the optimal conditions.1H-NMR characterization showed that there was no change in the structure and nitrile group of hydrogenated nitrile-butadiene rubber after rhodium catalysts were removed.

• Periodical: Advanced Materials Research (Volumes 311-313)
• Pages: 1152-1156
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.311-313.1152
• Online since: August 2011
• Authors: Hai Lin Xing, Hao Zhou, Li Qun Zhang, Wei Ming Wang, Dong Mei Yue
• Keywords: Amine, Extractant, Hydrogen Peroxide, Hydrogenated Nitrile-Butadiene Rubber, Remove, Rhodium Catalyst

References

[1] Pan Q.M., Rempel, G. L., "Numerical investigation of semibatch processes for hydrogenation of diene-based polymers", Ind. Eng. Chem. Res,39(2),277(2000)

DOI: 10.1021/ie9904347

[2] Martina,P., McManus,N. T., Rempel, G. L., "Hydrogenation of Nitrile-butadiene rubber catalysed by Ru (II) complexes", Studies in Surface Science and Catalysis,73,161-168(1992)

DOI: 10.1016/s0167-2991(08)60810-1

[3] Martina,P., McManus,N. T., Rempel, G. L., "A detailed study of the hydrogenation of nitrile-butadiene rubber and other substrates catalyzed by Ru(II) complexes"Journal of Molecular Catalysis A:Chemical, 126,115-131(1997)

DOI: 10.1016/s1381-1169(97)00102-7

[4] Mao T.F. Rempel, G. L., "Catalytic hydrogenation of nitrile-butadiene copolymers by cationic rhodium complexes" Journal of Molecular Catalysis A:Chemical,135,121-132(1998)

DOI: 10.1016/s1381-1169(97)00309-9

[5] Yue D.M., Shen Z.M., Xu R.Q. Wei Y.K., " Performance of new homogenous bimetallic biligand catalyst for NBR hydrogenation:Journal of Chemical Industry and Engineering,2006, 57(1),4145(2006)(in Chinese)

[6] Li,J.X., Bai W.Y. Jiang, X.,Yu,H.T., " Regeneration technique of waste rhodium catalysts and recovery of rhodium in carbonylation synthesis reaction", Precious Metals ,29 (1),53-55(2008)

[7] Albert,M. T., "Diene nitrile rubbers",US Pat., 3700637 (1972)

[8] Osman, A., William G., "Method to treat rhodium-containing solutions", US Pat., 4944926(1990)

[9] Bradford, William G., Arsenault, Gilles J.,Alexander J., "Process for removing rhodium-containing catalyst residue from hydrogenated nitrile rubber",US Pat., 4985540(1991)