Hydrogenation method for activation of hydroxy-terminated butyronitrile catalyst

Abstract

A hydrogenation method for activation of a hydroxy-terminated butyronitrile catalyst belongs to the field of hydrogenation catalysis. Raw hydrogenation materials adopted by the method comprise liquid hydroxy-terminated butyronitrile without any termination protection treatment and liquid hydroxy-terminated butyronitrile using hexamethyldisilazane for termination protection treatment. An activation method of the catalyst mainly comprises the steps of adding organic compounds such as alcohol and ketone as promotors and conducting selective hydrogenation on unsaturated double bonds of a polymer at 80-100 DEG C and 0-5 MPa for 2-12 h. According to the hydrogenation method, few organic compounds such as the alcohol and the ketone are used as the promotors, so that the reactivity of the catalyst is improved effectively, and the hydrogenation degree is increased greatly. In addition, the catalyst consumption required for reaching the same hydrogenation degree is reduced greatly, and the cost is saved significantly. According to the hydrogenation method, the high hydrogenation degree of the liquid hydroxy-terminated butyronitrile without any pretreatment is achieved for the first time, which cannot be achieved by other catalyst systems at present.

Description

technical field [0001] The invention relates to a hydrogenation method activated by a hydroxyl-terminated liquid butyronitrile catalyst, which is mainly used in the field of selective hydrogenation of carbon-carbon double bonds in molecular chains. Especially for hydroxyl-terminated liquid butyronitrile without any end-blocking protection treatment, the method involved in the present invention has very high hydrogenation activity, which is beyond the reach of other existing hydrogenation catalytic systems. Background technique [0002] Hydroxyl-terminated liquid butyronitrile is a telechelic polymer with butadiene and acrylonitrile as the main link, and hydroxyl groups at both ends of the molecular chain. It is a light yellow transparent liquid at room temperature, with a molecular weight between 2000-10000, referred to as HTBN . Hydroxyl-terminated liquid butyronitrile is a polymer with excellent performance, and its oil resistance and corrosion resistance are good. Due t...

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Problems solved by technology

The advantage of this method is that the hydrogenation of the hydroxyl-terminated liquid butyronitrile is realized through the capping technology. The disadvantage is that the terminal hydroxyl group needs to be capped before hydrogenation, and the capped product needs to be unblocked by hydroxyl reduction after hydrogenation. terminal measures

This not only increases the very cumbersome process steps and high cost, and the end-capping agent is not easy to remove, which has a very significant negative impact on the catalytic activity of the catalyst, but also greatly limits the application field of hydroxyl-terminated liquid butyronitrile

At present, no reports have been found to point out that the hydrogenation method of the hydroxyl-terminated liquid butyronitrile without any end-capping protection treatment can be directly adopted

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