HNBR-Hydrogenated Nitrile Butadiene Rubber

HNBR Manufacturing Process The production of HNBR typically follows a four-step catalytic process in a solution: Catalyst and Hydrogen Introduction: The solution is moved into a high-pressure reactor, such as an autoclave. A specialized catalyst (typically precious metals like rhodium, ruthenium, or palladium) and hydrogen gas are introduced to the mixture. Selective Hydrogenation Reaction: Under high pressure (0.1 to 15 MPa) and heat (80°C to 160°C), hydrogen atoms bond with the reactive double bonds in the butadiene segments. This converts them into more stable single bonds without affecting the nitrile groups that provide oil resistance. Purification and Recovery: Once the desired level of saturation is reached, the catalyst is removed through filtration or centrifuging. The HNBR is then isolated from the solvent using a coagulant like methanol, followed by washing and drying.