Driving inlet method of aniline liquid phase hydrogenation reactor

Abstract

The invention relates to a driving inlet method of an aniline liquid phase hydrogenation reactor. An inlet reactor hydrogen main pipeline is connected at the bottom of the aniline liquid phase hydrogenation reactor, and a trip valve is arranged on the inlet reactor hydrogen main pipeline. The driving inlet method of the aniline liquid phase hydrogenation reactor is characterized in that the trip valve of the inlet reactor hydrogen main pipeline is provided with a pipeline, and a bypass valve is arranged on the bypass pipeline; the bypass valve arranged on the bypass pipeline is started firstly at the time of driving, when pressure at both sides of the trip valve is balanced, the trip valve is then started, and the bypass valve arranged on the bypass pipeline is closed after meeting the driving requirement of the reactor system. The inlet method can prevent the damage of the hydrogenation reactor on internal parts in the process of driving hydrogen introduction, prolong the service life of the reactor and reduce the repair frequency of the reactor.

Description

technical field [0001] The invention relates to a liquid-phase hydrogenation reactor of an aniline plant, in particular to a gas intake method in the start-up stage of the liquid-phase hydrogenation reactor of an aniline plant. Background technique [0002] The start-up process of the aniline liquid-phase hydrogenation reactor is relatively complicated. The key is to introduce hydrogen before feeding, until the hydrogen content of the reactor system and the reactor pressure meet the start-up requirements. Its process is as figure 1 , the bottom of the aniline liquid-phase hydrogenation reactor 1 is connected to the reactor hydrogen main line, and a cut-off valve 2 is installed on the reactor hydrogen main line. The system pressure required for the start-up of the aniline liquid-phase hydrogenation reactor is 1.7MPa (absolute pressure). Before start-up, the pressure in the reactor is normal pressure, and the pressure in the hydrogen pipeline network is 1.9MPa (absolute press...

AI Technical Summary

Problems solved by technology

When bleed air, when the cut-off valve on the main line of hydrogen into the reactor is opened, the accumulated hydrogen can easily allow the air flow to carry the material at the bottom of the reactor to impact the internals of the reactor tray, causing serious damage to the internals of the reactor, especially the tray Severely distorted, squeezed and deformed, the reactor had to be shut down for maintenance, which not only caused serious economic losses, but also greatly affected the service life of the reactor, and also brought great hidden dangers to safe production

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