Method for generating palladium catalyst for producing hydrogen peroxide by using anthraquinone process

A palladium catalyst, catalyst technology, applied in catalyst regeneration/reactivation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc. Problems such as hot water flow to achieve the effect of eliminating the effect of short circuit

Inactive Publication Date: 2015-04-01
YANTAI BAICHUAN HUITONG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steam treatment method is to blow a large amount of water vapor into the catalyst bed, wash the organic matter and most of the inorganic salts attached to the surface of the catalyst through hot steam, and re-expose the covered active center on the catalyst surface, thereby restoring the catalyst activity. The treatment method has a better effect on the regeneration of the upper bed of the catalyst. With the deepening of the steam and the blocking and cooling of the catalyst, the steam entering the bed will gradually turn into hot water, resulting in a sharp decrease in the flow rate, and short-circuit outflow from the lower catalyst bed, resulting in lower Most of the catalysts in the half cannot be regenerated, and the overall regeneration effect is not good
The organic solvent soaking method usually uses heavy aromatic hydrocarbons, trioctyl phosphate or a mixed solvent of the two to soak the catalyst to dissolve the anthraquinone organic compounds attached to the surface of the catalyst, but this treatment method has no effect on the removal of inorganic salts such as alumina powder. Not big, the overall regeneration effect is not ideal

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specific Embodiment approach

[0016] The specific embodiment: the specific embodiment of the present invention is described in detail below:

[0017] If the control is good during the operation of the device, there will be no extraction with water and alkali in the tower, and the system will have less anthraquinone degradation. The working fluid will be cleaner, and the clay replaced by the clay bed will not be pulverized, and the resistance of the catalyst bed in the hydrogenation tower will increase slowly with the use of time. rise, the catalyst has no obvious agglomeration, and the following regeneration treatment method can be adopted, which includes the following steps:

[0018] a) Soak the catalyst to be regenerated in the device with aromatic hydrocarbons at 30-70°C for 8-16 hours, or use the hydrogenated liquid gas-liquid separator as a buffer vessel and use the hydrogenated liquid circulation pump to circulate for 8-16 hours. The used aromatics can be recovered to prepare new working fluid or dir...

Embodiment 1

[0029] Take 10Kg of the palladium catalyst to be regenerated and put it into the regeneration device, add 30L of aromatics at 70°C to soak for 16 hours, then drain the aromatics for recovery; then pass in saturated water vapor at 100-120°C for 16h-48h, and the steam condensed water will be clear and transparent as the end point. The amount of saturated steam should be 0.2-0.5 tons per hour per ton of catalyst. The initial steam condensate contains part of the working fluid, which can be recovered and reused after alkali washing and water washing; then add 30L 30℃ hot water to control the circulation pump flow 125L / h heat preservation cycle washing for 8-24h, sampling the hot water every half an hour during the cycle flushing process, drain the dirty water after the water becomes turbid and dirty, and refill it with hot water at 30°C to continue the cycle flushing, the sample water is clear and transparent End point: Drain the hot water and inject hot nitrogen at 100-150°C to d...

Embodiment 2

[0031] Take 10Kg of palladium catalyst to be regenerated and put it into the regeneration device, add 30L of aromatics at 50°C, control the circulation pump flow rate of 125L / h for heat preservation and cycle washing for 16h, then drain the aromatics for recovery; then pass in saturated water vapor at 100-120°C for 16h- 48h, with the clear and transparent steam condensate as the end point. The amount of saturated steam should be 0.2-0.5 tons per ton of catalyst per hour. Part of the working fluid contained in the initial steam condensate can be recycled and reused after washing with alkali and water; then add 30L of hot water at 95°C and soak for 8- For 24 hours, sample the hot water every half hour during the soaking process. After the water becomes turbid and dirty, drain the dirty water and refill it with 90°C hot water to continue soaking until the sampled water is clear and transparent; Dry the catalyst with hot nitrogen at 150°C; after the catalyst is blown dry, maintain...

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Abstract

The invention discloses a method for generating a palladium catalyst for producing hydrogen peroxide by using an anthraquinone process. The method comprises the following comprehensive regeneration steps: soaking or circularly washing a catalyst to be regenerated by using aromatic hydrocarbon with temperature of 30-70 DEG C, treating by using saturated steam with temperature of 100-120 DEG C, soaking or circularly washing by using hot water with temperature of 30-95 DEG C, displacing with nitrogen, activating with nitrogen, and the like. The regenerated catalyst is thorough in regeneration degree, good in activity recovery, and long in regeneration period and service life.

Description

Technical field: [0001] The invention relates to a regeneration treatment method of a palladium catalyst used in the production of hydrogen peroxide by an anthraquinone method, which belongs to the catalyst optimization use technology. Background technique: [0002] hydrogen peroxide (H 2 o 2 ) is an important chemical product widely used in papermaking, textiles, chemical synthesis, military industry, electronics, food processing, medicine, environmental protection, metallurgy and other fields. h 2 o 2 The production methods mainly include electrolysis method, anthraquinone method, isopropanol method and hydrogen-oxygen direct synthesis method, among which the anthraquinone method is the most commonly used production method and currently occupies a dominant position both at home and abroad. [0003] The anthraquinone method uses anthraquinone as a working carrier, and finally obtains H through three main processes: hydrogenation, oxidation, and extraction. 2 o 2 , whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/48B01J23/96B01J23/44
Inventor 张红杨吉存邓世盟魏承泉
Owner YANTAI BAICHUAN HUITONG TECH CO LTD
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