Device and method for preparing aniline by nitrobenzene hydrogenation

Abstract

The invention discloses a phenylamine making device and method hydrogenated by nitrobenzene in the chemical preparing technical domain, which comprises the following parts: fluid bed, gas distributor, gas-liquid double-flow sprayer, catalyst dense-phase area, heat-exchange device and component system, catalytic overflow pipe or inflow pipe, gasifying inlet system, liquid-phased inlet system and on-line regenerative device of catalyst, wherein each device connects entire inlet, reacting and catalyst regenerating reacting device; the catalyst is loaded in the fluid bed, which aerates little nitrogen or air to reduce; the composite gas with nitrobenzene and hydrogen is aerated into the reactor with impurity transmitted into phenylamine material nearly; the catalyst is returned to fluid bed through regenerative device, which guarantees continuous operation.

Description

technical field [0001] The present invention relates to a device and method for producing aniline by hydrogenation of nitrobenzene, in particular to a device and method capable of simultaneously realizing nitrobenzene liquid-phase feed and vaporization feed, and capable of realizing impurities containing high boiling points that are difficult to vaporize (such as dinitrogen) A device and a method for preparing aniline by continuous hydrogenation of nitrobenzene such as phenylbenzene, methylnitrobenzene, etc., belong to the technical field of chemical preparation. Background technique [0002] Aniline is a very important class of chemical products. With the wide application of polyurethane in the fields of construction, automobiles, electrical appliances and packaging materials, the output of methyl diisocyanate (MDI for short, prepared from aniline), the main raw material of polyurethane, has increased rapidly, resulting in a substantial increase in the consumption of anilin...

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Problems solved by technology

[0007] The purpose of the present invention is aimed at existing nitrobenzene high-temperature vaporization feed hydrogenation (high energy consumption, difficult temperature control, easy deactivation of catalyst, limited fluidized bed capacity) and independent nitrobenzene low-temperature liquid-phase feed hydrogenation ( High liquid distribution requirements) the shortcomings of the two methods of preparing aniline, as well as the current high energy consumption and low safety of hydrogenation after the purification of nitrobenzene and a very small amount of dinitrobenzene, a process with high-temperature vaporization of nitrobenzene at the same time is proposed The fluidized bed hydrogenation device and method of the material system and the low-temperature liquid phase feeding system achieve high operational safety, energy saving, high production intensity of the reactor, low investment, large operating flexibility, convenient temperature control, convenient heat transfer, and long catalyst life. Long, continuous process, low energy consumption, etc.

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