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Method for reactivating deactivated palladium/carbon catalyst

A carbon catalyst, carbon catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as inconvenience in the operation process, and achieve simple and effective operation. obvious effect

Inactive Publication Date: 2009-01-21
SINOPEC YANGZI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses high temperature and high pressure treatment for the deactivated catalyst, which is still inconvenient in the operation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 20 g of the deactivated palladium / carbon catalyst was washed with 10% NaOH solution at a washing temperature of 80° C., and then washed with deionized water until neutral.

[0022] Place the washed deactivated catalyst in 30% HNO 3 Solution, and heated to boiling for 2h. Then wash with deionized water until neutral, and dry.

[0023] 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.

[0024] 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, suction filtered, and washed with deionized water to obta...

Embodiment 2～3

[0026] The deactivated palladium-carbon catalyst was treated by changing the concentration and temperature of the alkali, and the deactivated catalyst was washed at 150°C by using 1% and 5% NaOH solutions respectively. All the other are with embodiment 1.

Embodiment 4

[0028] The type of alkali is changed to treat the deactivated palladium carbon catalyst, and KOH solution is used to treat the deactivated catalyst. All the other are with embodiment 1.

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Abstract

The invention relates to an inactive Pd carbon catalyst rebirth 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 heat lye washing inactivation Pd / carbon catalyst; use water washing to neutrality; 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. The operation of inactivation catalyst no need high temperature high pressure and simply, the anew catalyst activity correspond with a verdure catalyst activity.

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 palladium / carbon catalyst in a hydrogenation 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 catalyst to extract...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/96B01J23/44B01J21/18
Inventor 汪洋袁浩王保正堵文彬周启慧尹淑华
Owner SINOPEC YANGZI PETROCHEM