Regeneration method for nickel-base hydrogenation catalyst
A hydrogenation catalyst and catalyst technology, applied in the direction of catalyst regeneration/reactivation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of increasing energy consumption, increasing equipment investment, grain growth To reduce the cost of hydrogenation, prolong the operation period and lower the regeneration temperature
Inactive Publication Date: 2010-09-15
上海博润石化科技发展有限公司
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Problems solved by technology
[0006] Among the above technical solutions, some are only applicable to the regeneration of fine-grained Raney nickel-type catalysts, and cannot be used for the regeneration of fixed-bed nickel-containing catalysts
However, in the existing technical solution for the regeneration of the fixed-bed nickel-containing catalyst, since the regeneration temperature is as high as 200-500°C, although the polycondensate covering the catalyst surface can be hydrogenated at this time, the nickel atoms on the catalyst surface will also be hydrogenated at the same time. The growth of cluster grains reduces the activity of the catalyst. In addition, because the hydrogen needs to be heated to such a high temperature, it not only increases the equipment investment, but also increases the energy consumption.
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[0025] The hydrogenation reactor is a stainless steel tubular reactor of φ 25mm × 1000mm, and the reaction tube filling diameter is 25ml of a nickel-containing catalyst of 1 / 8 ", and the bottom of the reactor is filled with inert ceramic balls. The Ni content in the catalyst is 22%, and the NiO content is 46%, with the remainder being the carrier.
[0026] The m-xylene-isophthalonitrile-liquid ammonia (mass ratio is 50:8:42) solution is preheated and then pumped into the hydrogenation reactor from the top at a set rate, and hydrogen enters through the gas distributor. In the reactor, the raw material is mixed with hydrogen and enters the catalyst bed for hydrogenation reaction. The hydrogenation inlet temperature is 70°C, the hydrogen pressure is 11.5MPa, the molar ratio of hydrogen to raw material isophthalonitrile is 10, and the liquid of the reaction material is The hourly space velocity is 3.0h -1 . When the catalyst is in long-term operation, in order to make the conver...
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Abstract
The invention relates to the regeneration method for a nickel hydrogenation catalyst, which is divided into two stages: aminolysis of the condensation polymer, with catalyst bed temperature being 120-180deg.C, ammonia pressure being 0. 1-0. 5MPa, dimension ratio of ammonia and the catalyst being 10-40, regenerated time being 1-2 hours, hydrogenation for aminolysis in the temperature of 150-280deg.C, hydrogen pressure 1. 0- 3. 0MPa, hydrogen and catalyst dimension ratio being 10-40, regeneration time being 2-10 hours. Its activeness can reach the level of fresh catalyst. Due to tempered regeneration conditions, it can extend the life of the catalyst significantly.
Description
technical field [0001] The invention relates to a catalyst regeneration method, in particular to a regeneration method for preparing m-xylylenediamine-containing nickel granular catalyst through hydrogenation of isophthalonitrile. Background technique [0002] M-xylylenediamine is mainly used in epoxy resin curing agent and nylon modified polymer monomer. Usually m-xylylenediamine is produced by hydrogenation of isophthalonitrile. The hydrogenation reaction can adopt tank-type intermittent hydrogenation or fixed-bed continuous hydrogenation process, and the catalysts are all fine-grained catalysts or granular fixed-bed catalysts with nickel as the active component. From the comparison of hydrogenation effect, product quality and production cost, it can be seen that the batch hydrogenation process is obviously inferior to the continuous process in terms of product yield, production cost and product quality, making the process of producing m-xylylenediamine by fixed bed hydro...
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IPC IPC(8): B01J38/04B01J38/08B01J23/755B01J38/10C07C211/51C07C209/48
CPCY02P20/584
Inventor 倪俊
Owner 上海博润石化科技发展有限公司