Continuous catalytic hydrogenation production and catalyst regeneration device and method

Abstract

The invention discloses a continuous catalytic hydrogenation production and catalyst regeneration device, which is used for realizing hydrogenation product continuous production and reaction kettle hydrogenation catalyst in-situ regeneration. The device comprises a fusing section, a reaction kettle hydrogenation section, a catalyst regeneration section and a fixed bed reactor hydrogenation section which are connected through pipelines and are sealed, wherein the reaction kettle hydrogenation section comprises two high-pressure hydrogenation reaction kettles in parallel connection; the catalyst regeneration section and one high-pressure hydrogenation reaction kettle form a catalyst in-situ regeneration system. The device has the advantages that the automatic control on the continuous production of hydrogenation products, and the in-situ regeneration treatment of a reaction kettle hydrogenation catalyst can be realized, so that the use time of the catalyst can be prolonged; the catalyst loss is reduced; the production flow process is shortened; the energy consumption is reduced; the production efficiency is improved; the hydrogenation products with high quality and high yield can be produced. The invention also discloses a continuous catalytic hydrogenation production and catalyst regeneration method.

Description

technical field [0001] The invention relates to a chemical production device, in particular to a continuous catalytic hydrogenation production and catalyst regeneration device. The invention also relates to a method for continuous catalytic hydrogenation production and catalyst regeneration. Background technique [0002] At present, catalytic hydrogenation production basically uses batch tank reactors, or continuous tank reactors, or fixed bed reactors, or fluidized bed reactors. [0003] Batch tank reactor has the advantages of flexible operation, easy to change different operating conditions and product varieties, and is suitable for the production of products with small batches, multiple varieties, and long reaction times; the disadvantage is intermittent discontinuous production, and the products of each batch of reaction Performance fluctuates depending on operations. [0004] The advantage of the continuous tank reactor is that it can realize continuous production, b...

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Problems solved by technology

[0016] Chinese patent document 201610903803.7 discloses a catalytic hydrogenation continuous production device and production method, which uses a reactor and a fixed bed in series, and adopts a catalyst separation and return device in the middle to ensure continuous production, but cannot achieve online catalyst regeneration, catalyst separation and return The equipment is more complicated

[0017] To sum up, there are many defects in the existing production process and equipment of o-chloroaniline, some require multiple reactors connected in series, some require complex catalyst separation equipment, some require post-hydrogenation refining equipment, and some require high temperature Reaction, although multiple reactors connected in series can realize continuous production, but because the reactor is a fully mixed reaction, and the reaction time is too long after multiple reactors connected in series, the product yield is reduced and the quality is deteriorated

The open system of the hydrogenation reaction process or the inability to seal the intermediate steps will cause harm to the body and pollution to the environment. After the reactor reaction powder catalyst is deactivated, it needs to be unloaded for regeneration treatment, resulting in the loss of the catalyst and environmental pollution, while reducing production capacity. At the same time, due to the dechlorination phenomenon in the hydrogenation reaction of o-chloronitrobenzene, in addition to catalyst poisoning, it will also cause equipment corrosion, increase production costs, and increase equipment safety hazards

If an organic solvent is added for reaction, it will cause the separation, purification and loss of the solvent, which will increase the production cost and operational risk

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