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Reactivation method of palladium-carbon catalyst

A palladium-carbon catalyst and reactivation technology, applied in the chemical industry, can solve problems such as inconvenience in actual operation, and achieve the effects of simple operation, environmental friendliness, and reduction of production power costs.

Active Publication Date: 2016-02-03
安徽泰格维生素实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires high temperature and high pressure treatment, which is very inconvenient in actual operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The reactivation method of the palladium carbon catalyst of embodiment 1 medium degree deactivation

[0019] (1) The moderately deactivated palladium-carbon catalyst was washed with methanol solution under reflux for 6 hours, and the deactivated palladium-carbon catalyst was washed with deionized water for 3 times.

[0020] (2) Use deionized water as a solvent to clean the deactivated palladium carbon catalyst that has been refluxed with methanol solution on an ultrasonic cleaner with a wavelength of 250nm for 20 minutes, filter, and wash the filter cake 3 times.

[0021] (3) Soak the deactivated palladium-carbon catalyst filter cake with 0.8% NaOH solution for 4 hours, and filter.

[0022] (4) Put the filtered deactivated palladium carbon catalyst filter cake in deionized water at 90°C, stir and wash for 5 hours, and filter; wash the filter cake with deionized water until neutral, and dry to obtain the reactivated palladium carbon catalyst .

Embodiment 2

[0023] The reactivation method of the palladium carbon catalyst of embodiment 2 medium degree deactivation

[0024] Only the carbon catalyst in the step (1) of Example 1 was refluxed and washed with methanol solution, and changed to refluxed with ethanol, and the rest were the same as in Example 1.

Embodiment 3

[0025] The reactivation method of the palladium carbon catalyst of embodiment 3 medium degree deactivation

[0026] Only the carbon catalyst in the step (1) of Example 1 was washed by reflux with methanol solution, changed to reflux with isopropanol for 3 hours, and the ultrasonic wave length in step (2) was changed to 200 mm, and the rest were the same as in Example 1.

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PUM

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Abstract

The invention provides a method for reactivating a palladium carbon catalyst. The method comprises the following steps: washing an inactivated palladium carbon catalyst with an alcohol solution, then, cleaning the inactivated palladium carbon catalyst on an ultrasonic cleaning machine by using water as a solvent, soaking the inactivated palladium carbon catalyst in alkali liquor, finally washing the palladium carbon catalyst to neutral by using water, and drying the palladium carbon catalyst to obtain a reactivated palladium carbon catalyst. The method provided by the invention is suitable for reactivating moderately inactivated palladium carbon catalyst and recovering the catalytic effect necessary for a hydrogenation reaction. The activity of the activated palladium carbon catalyst is equivalent to that of a new palladium carbon catalyst. The method has the advantages of reducing the production power cost, needing no high temperature or high pressure, ensuring simple operation and being environmental-friendly.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for reactivating a palladium-carbon catalyst. Background technique [0002] Palladium carbon is a commonly used catalyst for hydrogenation reactions in the chemical industry. Palladium carbon hydrogenation has the characteristics of high hydrogenation reduction, good selectivity, stable performance, and small feed ratio when used. However, during the use of the palladium-carbon catalyst, due to factors such as the micropores of the palladium-carbon catalyst being blocked by organic matter, the active component palladium being covered by organic matter, and the palladium crystal grains growing to reduce the dispersion, the activity of the catalyst is reduced, or even completely Inactivate. [0003] Palladium is a rare and precious metal, and palladium-carbon catalysts are very expensive. The deactivated palladium carbon catalyst is properly treated to resto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/96
Inventor 贾洪涛
Owner 安徽泰格维生素实业有限公司
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