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Method for reactivating palledium/carbon catalyst

A palladium-carbon catalyst, carbon catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low resource utilization, inability to restore activity, Pollution of the environment and other issues to achieve effective reactivation effect

Inactive Publication Date: 2007-08-29
SINOPEC YANGZI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And to the heavier palladium / carbon catalyst of deactivation degree, its palladium content only has 0.2~0.3%, adopts the method for washing with alkaline solution to not restore its activity, generally adopt incineration and extract wherein palladium by chemical method, and this method There are disadvantages such as polluting the environment and low resource utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 20g deactivated palladium / carbon catalyst is placed in a supercritical CO2 extraction kettle, adding a temperature of 50 ° C, a pressure of 12MPa supercritical CO 2 , extracted for 4h.

[0026] supercritical CO 2 The deactivated catalyst after extraction was placed in 30% HNO3 solution and heated to boiling for 2 hours. Then wash with deionized water until neutral, and dry.

[0027] Place the dried deactivated catalyst in 200ml of deionized water, then slowly add ammonia water dropwise until the concentration of ammonia water in the solution reaches 0.1mol / L, and slowly stir for 2h.

[0028] The preparation of Pd solution, press 0.34% of the weight of processing deactivated palladium / carbon catalyst, weigh 0.062gPdCl 2 , add 20ml ammonia water dropwise to make PdCl 2 Completely dissolves to form Pd(NH 3 ) 4 Cl 2 solution, this solution was slowly added to the aforementioned deactivated palladium / carbon catalyst soaked in ammonia water, stirred for 3 hours, suctio...

Embodiment 2～5

[0031] change supercritical CO 2 Extraction temperature, using supercritical CO at 40°C, 60°C, 80°C, 100°C 2 Extract deactivated palladium carbon catalyst. All the other are with embodiment 1.

Embodiment 6～8

[0033] change supercritical CO 2 Extraction pressure, using 9.7MPa, 14MPa, 20MPa supercritical CO 2 Extract deactivated palladium carbon catalyst. All the other are the same as embodiment 1

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Abstract

The invention relates to a Pd carbon catalyst anew active method. The method did justice of inactivation catalyst to obtain anew active Pd / carbon catalyst supplied for the TA hydrorefining reaction. The method includes: use out threshold CO2 extract washing inactivation Pd / carbon catalyst; put the inactivation Pd / carbon catalyst into nitric acid solution to boil up; after drying park in the hartshorn; in addition add to PdCl2; after filtration get the catalyst prosome; catalyst prosome through NaOH and formaldehyde revert,drying get the anew active Pd / carbon catalyst.

Description

technical field [0001] The invention relates to a method for reactivating a palladium / carbon catalyst, more specifically, relates to a method for reactivating a deactivated palladium / carbon catalyst in a hydrofinishing reaction in a purified terephthalic acid (PTA) production process. Background technique [0002] It is well known that palladium / carbon catalyst is a special catalyst for PTA hydrorefining reaction process. During the use of palladium / carbon catalyst, with the loss of metal palladium in the catalyst, the growth of palladium grains, the poisoning effect of poisons, the covering of deposits and other factors, the activity of the catalyst gradually decreases until it is completely inactivated. [0003] Palladium is a rare metal, and palladium / carbon catalysts are more expensive. Properly treat the deactivated palladium / carbon catalyst to restore its activity and continue to be used for TA hydrorefining reaction; or process the deactivated palladium / carbon cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/96B01J23/44
Inventor 汪洋王保正袁浩堵文彬周启慧尹淑华
Owner SINOPEC YANGZI PETROCHEM
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