A liquid phase solvent for acetylene hydrogenation to ethylene slurry bed

Abstract

The invention relates to a liquid phase solvent for an acetylene hydrogenation to ethylene slurry state bed. The liquid phase solvent comprises the following components in parts by weight: 0.5-15 parts of 2-methylcyclohexyl acetate, 50-85 parts of a selective solvent, 0.5-15 parts of an ionic liquid and 0.3-10 parts of a hydrogen donor. The obtained liquid solvent not only can be used for uniformly dispersing a catalyst in the liquid phase solvent to immediate transfer reaction heat and prevent the catalyst from being sintered, inactivated and the like, but also can be used for efficiently providing hydrogen free radicals to acetylene hydrogenation for adsorption in an active center of the catalyst when the reaction gas enters into the liquid phase solvent so as to improve the efficiency of the catalyst, prevent coverage of the catalyst as acetylene is self-polymerized to generate a green oil polymer and prolong the service life of the catalyst; meanwhile, the boiling point of a liquid phase solvent system is increased, the concentration and viscosity of the solvent required by a reactor are ensured, the load of solvent recovery in the next step is reduced, and the energy consumption level of the device is effectively reduced.

Description

technical field [0001] The invention relates to a liquid phase solvent used for acetylene hydrogenation to produce ethylene slurry bed, and belongs to the technical field of ethylene preparation. Background technique [0002] In coal chemical technology, coal is used as raw material to produce acetylene through calcium carbide process or natural gas as raw material through non-catalytic partial oxidation process, and then acetylene is used as raw material to produce ethylene products by hydrogenation under the action of selective hydrogenation catalyst. Since the acetylene hydrogenation reaction is an instantaneous strong exothermic reaction, experiments at home and abroad have shown that when a fixed-bed reactor is used for the acetylene hydrogenation reaction, a large amount of heat will be accumulated instantaneously in the reaction, resulting in a "flying temperature" phenomenon. Therefore, domestic and overseas tend to adopt the slurry bed with good mass transfer and he...

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Problems solved by technology

[0003] At present, experiments have revealed that the optimum temperature for the hydrogenation of acetylene to ethylene is around 160°C, which is just within the boiling range of the solvent system. As the reaction progresses, the solvents such as NMP and DMF in the solvent continue to evaporate. The target product ethylene gas escapes from the reaction system, resulting in a continuous increase in the concentration and viscosity of the solvent system in the reactor. The escape of the solvent will also increase the load of the solvent recovery process, resulting in a substantial increase in production costs