CN-224208044-U - Hydrogen peroxide fixed bed catalyst air regeneration system

CN224208044UCN 224208044 UCN224208044 UCN 224208044UCN-224208044-U

Abstract

The utility model provides a regeneration system of hydrogen peroxide fixed bed catalyst air, which is characterized in that a first main pipeline is used for introducing air, nitrogen, steam and desalted water into an upper tower of a hydrogenation tower, a second main pipeline is used for introducing working solution and aromatic hydrocarbon, a cooler is used for cooling steam condensate, an inlet of the cooler is respectively communicated with the upper tower of the hydrogenation tower, a middle tower of the hydrogenation tower and a lower tower of the hydrogenation tower, a separator is used for separating tail gas in the condensate from condensate or aromatic hydrocarbon, and aromatic hydrocarbon obtained by separation of the separator is introduced into an aromatic hydrocarbon pipeline for recycling through an aromatic hydrocarbon reflux pipeline. Organic impurities adsorbed by a catalyst in the hydrogenation tower are fully dissolved and washed by an aromatic hydrocarbon solvent, and the organic impurities are matched with an air oxidation catalyst for regeneration, so that partial reductive substances adsorbed by the catalyst are oxidized and dissolved by the aromatic hydrocarbon solvent, the catalyst is deeply regenerated, a better catalyst regeneration effect is achieved, the service cycle of the catalyst is prolonged, and the energy consumption of products is reduced.

Inventors

WEN CHANGMING
HUO ZENGHUI
JIA RUIPING
LI BENWEI
LU TAO
LIU YONGFU
SUN SEN
XU GANG
MA CHUNYAN
JIANG GUANGPEI

Assignees

东明旭阳化工有限公司

Dates

Publication Date: 20260508
Application Date: 20250408

Claims (8)

1. The utility model provides a regeneration system of hydrogen peroxide fixed bed catalyst air which characterized in that is applied to the hydrogenation tower, and the hydrogenation tower includes hydrogenation tower upper tower, hydrogenation tower middle tower and hydrogenation tower lower tower, and regeneration system includes: A first main pipeline for communicating an air pipeline, a nitrogen pipeline, a steam pipeline and a desalting water pipeline with the upper tower of the hydrogenation tower, and introducing air, nitrogen, steam and desalted water into the upper tower of the hydrogenation tower so as to purge, steam regeneration, temperature and pressure control the hydrogenation tower; The second main pipeline is communicated with the upper tower of the hydrogenation tower and is used for introducing working solution and aromatic hydrocarbon; A cooler for cooling the steam condensate; the inlet of the cooler is respectively communicated with the upper tower, the middle tower and the lower tower of the hydrogenation tower; The separator is communicated with the outlet of the cooler to receive the steam condensate cooled by the cooler and separate tail gas in the condensate from condensate or aromatic hydrocarbon; The device comprises an aromatic hydrocarbon pipeline, a hydrogenation tower upper tower, a hydrogenation tower middle tower, a hydrogenation tower lower tower, a hydrogenation tower middle tower, a hydrogenation tower upper tower, a hydrogenation tower middle tower and a hydrogenation tower middle tower, wherein the aromatic hydrocarbon pipeline is provided with a circulating pump and is used for supplementing aromatic hydrocarbon into the hydrogenation tower lower tower and circularly supplementing aromatic hydrocarbon into the hydrogenation tower upper tower and the hydrogenation tower middle tower through the circulating pump so as to circularly clean the aromatic hydrocarbon of the hydrogenation tower, further realize the catalyst regeneration of the hydrogenation tower, and perform the catalyst regeneration and the air oxidation catalyst regeneration of the hydrogenation tower under the condition that air is introduced into the hydrogenation tower upper tower through the air pipeline; And the aromatic hydrocarbon reflux pipeline is communicated with the separator and the aromatic hydrocarbon pipeline so as to introduce the aromatic hydrocarbon separated by the separator into the aromatic hydrocarbon pipeline for circulation.
2. The hydrogen peroxide fixed bed catalyst air regeneration system according to claim 1, wherein an air valve is arranged on the air pipeline, A nitrogen valve is arranged on the nitrogen pipeline, A steam valve is arranged on the steam pipeline, A desalting water valve is arranged on the desalting water pipeline; The air valve, the nitrogen valve, the steam valve and the desalination valve can be respectively opened and closed.
3. The hydrogen peroxide fixed bed catalyst air regeneration system according to claim 1, wherein a hydrogenation tower upper tower working solution discharging valve and a hydrogenation tower middle tower working solution feeding valve are arranged on a connecting pipeline between the hydrogenation tower upper tower and the hydrogenation tower middle tower, and materials in the hydrogenation tower upper tower can enter the hydrogenation tower middle tower under the condition that the hydrogenation tower upper tower working solution discharging valve and the hydrogenation tower middle tower working solution feeding valve are opened so as to realize the communication between the hydrogenation tower upper tower and the hydrogenation tower middle tower.
4. The hydrogen peroxide fixed bed catalyst air regeneration system according to claim 1, wherein a discharge pipeline is arranged at the bottom of the lower hydrogenation tower, a lower hydrogenation tower discharge valve is arranged on the discharge pipeline, the aromatic hydrocarbon pipeline comprises an aromatic hydrocarbon supplementing pipeline, an aromatic hydrocarbon circulating pipeline and a circulating pump feeding pipeline which are sequentially connected, and when the lower hydrogenation tower discharge valve is opened, aromatic hydrocarbon can enter the lower hydrogenation tower through the aromatic hydrocarbon supplementing pipeline, the aromatic hydrocarbon circulating pipeline and the discharge pipeline of the lower hydrogenation tower, and aromatic hydrocarbon can enter the upper hydrogenation tower through the aromatic hydrocarbon supplementing pipeline, the aromatic hydrocarbon circulating pipeline and the circulating pump feeding pipeline and enter the middle hydrogenation tower through a connecting pipeline between the upper hydrogenation tower and the middle hydrogenation tower.
5. The hydrogen peroxide fixed bed catalyst air regeneration system according to claim 4, wherein a circulation regulating valve is arranged on a feed line of the circulation pump to regulate the circulation amount of the aromatic hydrocarbon.
6. The hydrogen peroxide fixed bed catalyst air regeneration system according to claim 1, wherein the separator is further communicated with a tail gas vent line, a tail gas vent regulating valve is arranged on the tail gas vent line, and the pressure in the tower of the hydrogenation tower can be controlled under the condition that the tail gas vent regulating valve is opened.
7. The hydrogen peroxide fixed bed catalyst air regeneration system according to claim 1, wherein an upper tower regenerated hydrogen gas condensate valve is arranged on a hydrogenation tower regenerated steam condensate line connected with an upper tower of the hydrogenation tower, and a middle tower regenerated hydrogen gas condensate valve is arranged on a hydrogenation tower regenerated steam condensate line connected with a middle tower of the hydrogenation tower.
8. The hydrogen peroxide fixed bed catalyst air regeneration system according to claim 1, further comprising a discharge line provided with a recovery valve, the discharge line being used to connect the outlet of the separator and the recovery system to deliver the condensate and aromatic hydrocarbon separated by the separator to the recovery system.

Description

Hydrogen peroxide fixed bed catalyst air regeneration system Technical Field The utility model relates to the technical field of hydrogen peroxide production, in particular to a regeneration system of hydrogen peroxide fixed bed catalyst air. Background The hydrogen peroxide is produced by adopting a palladium catalyst fixed bed hydrogenation mode, the activity of the catalyst gradually decreases after the palladium catalyst is used for a period of time in hydrogenation reaction, and the catalyst needs to be regenerated when the catalyst has reached a certain degree of conditions for promoting the reaction and the activity of the catalyst can not meet the minimum production requirement. In general, a steam purging method is adopted for regenerating the palladium catalyst of the fixed bed, namely, after the fixed bed is stopped, working solution in the fixed bed is purged by nitrogen, then, saturated steam is used for dissolving and flushing organic impurities and inorganic salt impurities adsorbed on the palladium catalyst, regeneration is stopped until condensed water is clear and transparent, and finally, the catalyst in the fixed bed is circularly dried and cooled by nitrogen. The treatment method has better regeneration effect on the catalyst at the early stage of the catalyst bed, but as the service period of the catalyst is prolonged, the organic impurities deeply adsorbed by the micropores of the catalyst are increased, and the organic impurities adsorbed in the catalyst cannot be deeply cleaned by a single steam regeneration method, so that the ideal regeneration effect cannot be achieved. The regenerated catalyst has short service cycle and high regeneration steam consumption, and the catalyst has low productivity and high production cost due to insufficient activity in subsequent production. Disclosure of utility model The embodiment of the utility model aims to provide a regeneration system of hydrogen peroxide fixed bed catalyst air. The embodiment of the utility model adopts the following technical scheme that the regeneration system of the hydrogen peroxide fixed bed catalyst air is applied to a hydrogenation tower, the hydrogenation tower comprises an upper tower of the hydrogenation tower, a middle tower of the hydrogenation tower and a lower tower of the hydrogenation tower, and the regeneration system comprises: A first main pipeline for communicating an air pipeline, a nitrogen pipeline, a steam pipeline and a desalting water pipeline with the upper tower of the hydrogenation tower, and introducing air, nitrogen, steam and desalted water into the upper tower of the hydrogenation tower so as to purge, steam regeneration, temperature and pressure control the hydrogenation tower; The second main pipeline is communicated with the upper tower of the hydrogenation tower and is used for introducing working solution and aromatic hydrocarbon; A cooler for cooling the steam condensate; the inlet of the cooler is respectively communicated with the upper tower, the middle tower and the lower tower of the hydrogenation tower; The separator is communicated with the outlet of the cooler to receive the steam condensate cooled by the cooler and separate tail gas in the condensate from condensate or aromatic hydrocarbon; The device comprises an aromatic hydrocarbon pipeline, a hydrogenation tower upper tower, a hydrogenation tower middle tower, a hydrogenation tower lower tower, a hydrogenation tower middle tower, a hydrogenation tower upper tower, a hydrogenation tower middle tower and a hydrogenation tower middle tower, wherein the aromatic hydrocarbon pipeline is provided with a circulating pump and is used for supplementing aromatic hydrocarbon into the hydrogenation tower lower tower and circularly supplementing aromatic hydrocarbon into the hydrogenation tower upper tower and the hydrogenation tower middle tower through the circulating pump so as to circularly clean the aromatic hydrocarbon of the hydrogenation tower, further realize the catalyst regeneration of the hydrogenation tower, and perform the catalyst regeneration and the air oxidation catalyst regeneration of the hydrogenation tower under the condition that air is introduced into the hydrogenation tower upper tower through the air pipeline; And the aromatic hydrocarbon reflux pipeline is communicated with the separator and the aromatic hydrocarbon pipeline so as to introduce the aromatic hydrocarbon separated by the separator into the aromatic hydrocarbon pipeline for circulation. In some embodiments, an air valve is provided on the air line, A nitrogen valve is arranged on the nitrogen pipeline, A steam valve is arranged on the steam pipeline, A desalting water valve is arranged on the desalting water pipeline; The air valve, the nitrogen valve, the steam valve and the desalination valve can be respectively opened and closed. In some embodiments, a connecting pipe between the upper tower of the hydrogenation tower and the middle tower of