Method for regenerating activity of deactivated ferritic catalyst

A catalyst and iron-based technology, applied in the field of deactivation and regeneration of iron-based catalysts, can solve the problems of short service life of regenerated catalysts, undiscovered, hidden dangers of explosion, etc.

Active Publication Date: 2011-04-06
NANTONG XINGCHEN SYNTHETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has a certain effect, it needs to regenerate the catalyst four times. If it is only regenerated once or twice, the life of the regenerated catalyst will be shorter, and it will not exceed one month after evaluation; in addition, the regeneration is too frequent, which is not conducive to large-scale production; the third , the space of the air-ventilated roasting equipment is too small, and there is a risk of explosion
[0005] Another related Fe 2 o 3 Catalytic Methylatio

Method used

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  • Method for regenerating activity of deactivated ferritic catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 200 grams of deactivated catalyst, put it into a muffle furnace, and roast it with air at 475° C. to remove the coke. Keep the air flow rate at 20 L / h and keep it warm for 4 hours. Smash it for later use.

[0034] Get 143 grams of above-mentioned pulverized catalysts, put into the 2000ml there-necked flask that is stirred and heated with a condenser, add 1000 grams of 36% nitric acid and 300 grams of 30% hydrochloric acid, heat up under stirring, and keep warm at 100° C. for 8 hours.

[0035] The content of nitric acid in the reaction liquid is detected by the method of acid-base neutralization, and when the content reaches 15%, the stirring reaction is continued for 2 hours. Stirring and heating were discontinued and allowed to stand for 48 hours.

[0036] After the temperature is cooled to room temperature, filter, and detect the content of iron, chromium, sodium and indium in the filtrate by atomic absorption method, and convert it into the mass percentage cont...

Embodiment 2

[0043] Take 200 grams of deactivated catalyst, put it into a muffle furnace, and roast it with air at 450° C. to remove the coke. Keep the air flow rate at 20 L / h and keep it warm for 8 hours. Smash it for later use.

[0044]Get 143 grams of above-mentioned pulverized catalysts, put into the 2000ml there-necked flask that is stirred and heated with a condenser, add 1210 grams of 36% nitric acid and 300 grams of 30% hydrochloric acid, heat up under stirring, and keep warm at 150° C. for 4 hours.

[0045] The content of nitric acid in the reaction liquid is detected by the method of acid-base neutralization, and when the content reaches 15%, the stirring reaction is continued for 1.5 hours. Stop stirring and heating, let stand for 50 hours.

[0046] After the temperature is cooled to room temperature, filter, and detect the content of iron, chromium, sodium and indium in the filtrate by atomic absorption method, then supplement the corresponding amount according to the method o...

Embodiment 3

[0049] Take 200 grams of deactivated catalyst, put it into a muffle furnace, and roast it with air at 460° C. to remove the coke. Keep the air flow rate at 20 L / h and keep it warm for 10 hours. Smash it for later use.

[0050] Take 143 grams of the above pulverized catalyst, put it into a 1500ml there-necked flask with condenser stirring and heating, add 600 grams of aqua regia, heat up under stirring, and keep warm at 100°C for 8 hours.

[0051] The content of aqua regia in the reaction solution was detected by the method of acid-base neutralization, and when the content reached 15%, the stirring reaction was continued for 2.5 hours. Stirring and heating were stopped and allowed to stand for 46 hours.

[0052] After the temperature is cooled to room temperature, filter, and detect the content of iron, chromium, sodium and indium in the filtrate by atomic absorption method, then supplement the corresponding amount according to the method of Example 1, and operate in the same ...

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Abstract

The invention provides a method for regenerating activity of a deactivated ferritic catalyst. The ferritic catalyst is a catalyst for catalyzing 2,6-xylenol to produce polyphenylene oxide and comprises Fe2O3 and In2O3. The method comprises the following steps of: introducing air into a deactivated catalyst; sintering the catalyst at the temperature of between 450 and 500 DEG C to remove coked carbon in the catalyst; crushing; thermally dissolving the crushed catalyst with 10 to 63 percent of nitric acid or a mixed liquor of the nitric acid and hydrochloric acid at the temperature of between 60 and 150 DEG C; detecting the acidulated reactive fluid; calculating according to detection results; and correspondingly adding required chromium nitrate, sodium silicate and indium.

Description

technical field [0001] The invention relates to a method for deactivating and regenerating a catalyst, in particular to a catalyst containing Fe 2 o 3 、In 2 o 3 A method for the deactivation and regeneration of iron-based catalysts. Background technique [0002] 2,6-Dimethylphenol is an important monomer for the production of polyphenylene ether. After the catalyst used for production is used, the catalyst is deactivated due to serious accumulation. Currently, the deactivated catalyst in production is often treated as waste residue. [0003] The catalyst used in the present invention is an iron-based catalyst based on iron-indium series, and the main component is Fe 2 o 3 、In 2 o 3 . Therefore, the deactivated catalyst contains more Fe 2 o 3 、In 2 o 3 , also contains a small amount of silicon oxide, chromium oxide, and calcium oxide and other substances. Among them, In 2 o 3 It is a relatively precious metal and the main component of the catalyst. In terms of ...

Claims

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Application Information

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IPC IPC(8): B01J38/02B01J38/60B01J23/825C08G65/34
CPCY02P20/584
Inventor 刘永红李振刚张小林赵建朝刘林
Owner NANTONG XINGCHEN SYNTHETIC MATERIAL
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