Gas-phase reaction device and preparation method of dicyclohexylamine

Abstract

The invention discloses a gas-phase reaction device for breaking gas-phase reaction equilibrium limitation through reactive distillation outside a tower and a preparation method of dicyclohexylamine.The preparation method, aiming at gas-phase reaction with balance limitation; reactants or intermediate products being light components; and products being heavy components, comprises following steps:enabling gas reaching reaction equilibrium at an outlet of a primary reactor to enter a rectifying tower (or a stripping tower); cooling heavy component products into a liquid phase; wherein most ofthe reaction raw materials exist in a gas phase; enabling tower top gas phase to enter a secondary reactor after cross heat exchange through a superheater, after reaction, carrying out cooled mixturecondensation and refluxing, enabling heavy component products to enter a tower bottom through the rectification effect, enabling light component reactants or intermediate products to continuously enter the secondary reactor for reaction, so that the whole reaction yield is greatly improved.

Description

technical field [0001] The invention relates to a gas phase reaction device in which two reactors are respectively arranged before and after a rectification tower, and a method for preparing dicyclohexylamine using the device. More specifically, the present invention relates to a process intensification method and device for breaking the limitation of gas phase reaction equilibrium by external reactive distillation. Background technique [0002] For systems with gas-phase reaction equilibrium limitations, the usual practice is to cool the reaction gas through a quench tower to obtain products, and use a compressor to circulate the non-condensable gas back to the reactor for use, such as figure 1 shown in ; the reaction heat of this method needs to be removed by cooling water, which has not been fully utilized. Since the overhead gas is directly returned to the first-stage reactor, light component impurities may be enriched in the system, so a large amount of reaction gas has...

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Problems solved by technology

[0002] For systems with gas-phase reaction equilibrium limitations, the usual practice is to cool the reaction gas through a quench tower to obtain products, and use a compressor to circulate the non-condensable gas back to the reactor for use, such as figure 1 shown in ; the reaction heat of this method needs to be removed by cooling water, which has not been fully utilized. Since the overhead gas is directly returned to the first-stage reactor, light component impurities may be enriched in the system, so a large amount of reaction gas has to be released , resulting in material waste

In addition, the existing technology can also adopt figure 2 In the process shown, the traditional solution to the gas phase equilibrium reaction usually includes cooling, compression and recycling; since there is no rectification, a large amount of products may be recycled back to the reactor, resulting in poor reaction effect

[0003] Yet, be subjected to the limitation of reaction equilibrium, the conversion rate and the yield in the gas phase reaction device of prior art are not so ideal

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