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Method for regenerating inactivated hydrotreating catalyst

A deactivated catalyst and hydrotreating technology, applied in the direction of catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of waste slag discharge and treatment, deactivation of hydrotreating catalysts, etc., to achieve The effect of saving catalyst cost and improving utilization value

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common problems in the existing waste catalyst metal recovery technology are: use higher temperature to pulverize the waste catalyst after carbon removal, then use alkaline solution to leach metal vanadium and molybdenum, use acidic solution to leach metal cobalt and nickel, and finally The generated waste residue needs to be discharged for disposal
[0007] Since heavy oil and residual oil contain a large amount of metal impurities such as nickel, vanadium, and iron, they are easily deposited on the surface of the hydrotreating catalyst during the hydrotreating process, resulting in deactivation of the hydrotreating catalyst
At present, there is no report on how to remove the metal impurities deposited in the deactivated hydrotreating catalyst and restore the pore structure and activity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Get 10g of heavy oil hydrogenation waste catalyst after industrial operation, and this catalyst is NiMo / Al 2 o 3 , that is, the inactivator A-1 is put into a fat extractor, and petroleum ether and ethanol are mixed by 1:1 (volume) as a solvent, and the volume ratio of solvent and catalyst is 10:1, and extracted at 80° C. for 30 hours. Gained sample is put into the ammonium carbonate solution of 2 times of volume after being dried, and ammonium carbonate solution concentration is 15wt%, and after leaving standstill at room temperature 4 hours, filter and separate, and be that 1.0wt% oxalic acid repeatedly washs catalyzer 3 times with concentration, every wash for 0.20 hours. The resulting precipitate and washing liquid are collected and the metal components therein are recovered.

[0021] The acid-washed catalyst is dried and placed in a high-temperature furnace for roasting to remove carbon. The heating rate was 3°C / min, and the temperature was kept at 230°C for 3 ho...

Embodiment 2

[0032] Get 10g of heavy oil hydrogenation waste catalyst after industrial operation, and this catalyst is NiMo / Al 2 o 3 , that is, inactivator A-1, put into a fat extractor, mix 1:1 (volume) with toluene and ethanol as solvent, solvent and catalyst volume ratio 8:1, extract at 65 DEG C for 30 hours. Gained sample is put into the sodium carbonate solution of 3 times of volumes after being dried, and sodium carbonate solution concentration is 8wt%, and after leaving standstill at room temperature 4 hours, filter and separate, and be that 0.6wt% hydrochloric acid repeatedly washs catalyzer 3 times with concentration, every wash for 0.5 hours. The resulting precipitate and washing liquid are collected and the metal components therein are recovered. The acid-washed catalyst is dried and placed in a high-temperature furnace for roasting to remove carbon. The heating rate was 3°C / min, and the temperature was kept at 280°C for 3 hours; after 4 hours at 380°C, a light green regenera...

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PUM

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Abstract

The invention discloses a method for regenerating an inactivated hydrotreating catalyst. The method comprises the following steps: carrying out oil removal pretreatment on the inactivated hydrotreating catalyst, removing depositional metal impurities in the inactivated catalyst, carrying out carbon burning treatment on the inactivated catalyst; wherein a method for removing the depositional metalimpurities in the inactivated catalyst comprises the following steps: dipping the inactivated catalyst by an alkaline solution, filtering and pickling. The method of the invention is capable of removing the metal impurities like depositional nickel, vanadium and iron in the inactivated hydrotreating catalyst, and recovering a pore structure and catalysis performance of the catalyst, the method for regenerating the inactivated hydrotreating catalyst has the advantages of small investment, less pollution, simple process and easy industrialization.

Description

technical field [0001] The present invention relates to a method for regenerating deactivated catalysts produced during petroleum refining, in particular to a method for regenerating deactivated hydrotreating catalysts caused by deposition of metal impurities such as nickel and vanadium. Background technique [0002] During the hydrogenation reaction, the activity of the catalyst gradually decreases with the prolongation of operation time and eventually becomes deactivated. There are many factors that cause catalyst deactivation, among which coke deposition is the most important factor. Coke is usually deposited on the catalyst surface to block the pores and cover the active sites of the catalyst, thereby reducing the reaction activity. Deactivated spent catalysts are typically regenerated and reused. The spent catalyst that cannot be regenerated is discarded as solid waste. The vast majority of catalyst waste in refineries originates from residual hydrotreating and refin...

Claims

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Application Information

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IPC IPC(8): B01J38/64B01J38/66B01J38/60B01J38/62B01J38/02B01J38/52B01J38/56B01J23/883C10G45/08
Inventor 张成王永林杨刚吴国林
Owner CHINA PETROLEUM & CHEM CORP
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