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Petroleum resin hydrogenation catalyst

author£ºadmin Date£º2017/3/2 17:19:10

Foreign technology of hydrogenated petroleum resin after years of development has become mature, most of the production capacity of petroleum resin hydrogenation plant in the 20 000 t /a or so. Due to the increase of production scale and the simplification of process operation, the new petroleum resin hydrogenation unit mainly adopts fixed bed hydrogenation process.

Petroleum resin due to raw materials and polymerization process on the reasons for the existence of double bond or aromatic structure, and contains halides, hydrogen sulfide and colloid, so the difficulty of hydrogenation of petroleum resin is relatively large; and catalyst activity, selectivity and Stability is directly related to the performance of the product. According to the different production processes, the use of the catalyst system is mainly precious metals and non-precious metals two categories.

The hydrogenation process of the kettle generally adopts the powdery Ni catalyst, while the fixed bed hydrogenation process usually adopts the supported palladium (Pd), platinum (Pt) and Ni as the catalyst. Among them, Ni-based hydrogenation catalyst (low price, high activity and strong ability of anti-sulfur) can make the oil contained sulfur (S), nitrogen (N) and oxygen (O) and other miscellaneous organic compounds hydrogenation. With a wide range of raw materials, high liquid yield, product performance, and other advantages, which are widely used. Most of the early catalysts were supported on alumina and diatomaceous earth Ni catalyst (Ni content of 40% to 60%). Supported catalyst temperature is low (usually around 260 ¡æ), the hydrogenation product indicators to meet the requirements, but the material throughput and catalyst life is limited. To this end, the researchers by adjusting the catalyst to reduce the proportion of Ni and total Ni, the catalyst loading method and the addition of IIb and Group IIa elements and other ways to improve the catalyst's resistance to sulfur poisoning, and extend its service life.