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Method for reactivating waste catalytic cracking catalyst

A technology for catalytic cracking and spent catalysts, applied in catalytic cracking, catalyst regeneration/reactivation, physical/chemical process catalysts, etc., can solve the problems of decreased activity and high acid strength, and achieve high activity stability, high retention, and reduced Effect of Hydrogen Yield and/or Coke Yield

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when high metal removal is achieved, the acid strength is high, which has a greater impact on the activity stability. Although the single-time activity is higher due to the surface acidic activation, the activity decreases rapidly after repeated use.

Method used

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Embodiment approach

[0015] The method for revitalizing a spent catalytic cracking catalyst provided by the present invention, one embodiment, the silica mass fraction of the spent catalytic cracking catalyst is 30-75 mass%, the mass fraction of aluminum oxide is 20-65 mass%, and the rare earth metal The mass fraction is 0-5 mass%, and the nickel mass fraction is >0.4 mass%, such as 0.4-1.5 wt%. Preferably, the crystallinity of the spent catalytic cracking catalyst is ≥ 10%, such as ≥ 15%. The crystallinity can be analyzed with reference to SH / T 0340-1992 NaY molecular sieve crystallinity determination method. Preferably, the sum of the contents of vanadium and iron in the spent catalytic cracking catalyst is not higher than 0.6% by mass. In one embodiment, the content of polluted nickel in the spent catalytic cracking catalyst is significantly higher than the content of polluted vanadium and iron.

[0016] The method for revitalizing the spent catalytic cracking catalyst provided by the inventi...

Embodiment 1

[0034] Weighing 10 grams of spent catalytic cracking catalyst C1 was fluidized and roasted at 800°C for 3 hours in a hydrogen-helium atmosphere with a hydrogen content of 30% by volume to obtain reduced spent catalytic cracking catalyst HC1. Add 200ml NH to a 1L three-neck flask 3 and NH 4 + The total concentration of 8mol / L, NH 3 :CO 3 2 -Ammonia-ammonium carbonate solution with a mass ratio of 135:86, turn on the water bath to heat, and use a condenser to cool the volatile matter with tap water (temperature 16° C.), and reflux the condensate (hereinafter also referred to as condensing the volatile matter to reflux). Raise the temperature to 45° C., add 10 g of the reduced spent catalytic cracking catalyst HCl, and pass oxygen at 1 L / min for 30 min to perform the first contact. The pH throughout the first contacting process is 10.1-10.5. After filtering, the spent catalytic cracking catalyst after the first contact is obtained. The waste catalytic cracking catalyst aft...

Embodiment 2

[0038] Weighing 10 grams of spent catalytic cracking catalyst C1 was fluidized and roasted at 800°C for 3 hours in a hydrogen-helium atmosphere with a hydrogen content of 30% by volume to obtain reduced spent catalytic cracking catalyst HC2. Add 200ml NH to a 1L three-neck flask 3 and NH 4 + The total concentration of 8mol / L, NH 3 :CO 3 2 -Ammonia-ammonium carbonate solution with a mass ratio of 135:86, turn on the water bath to heat and use a condenser tube to condense and reflux the volatile substances. Raise the temperature to 45° C., add 10 g of the reduced spent catalytic cracking catalyst HC2, and pass oxygen at 1 L / min for 30 min to perform the first contact. The pH value of the whole first contact process is 10.1-10.5. After filtration, rinse twice with 100 ml of distilled water at room temperature to obtain the spent catalytic cracking catalyst after the first contact. Dry in a dryer at 150°C to obtain revived catalyst FC1-2.

[0039] The nickel mass fraction ...

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Abstract

The invention relates to a method for reactivating a waste catalytic cracking catalyst. The method comprises the following steps: (1) treating the waste catalytic cracking catalyst in a reducing atmosphere; (2) carrying out proper contact and oxygen treatment on the treated waste catalyst in an ammonia-ammonium solution; and (3) heat treatment. According to the catalytic cracking catalyst reactivation method provided by the invention, the reactivated catalytic cracking catalyst is less in structural damage, high in activity and high in stability, and hydrogen factors can be reduced.

Description

technical field [0001] The invention relates to a method for revitalizing spent catalytic cracking catalysts. Background technique [0002] Catalytic cracking (FCC) catalyst is the most widely used catalyst in the oil refining process. At present, the amount of catalytic cracking catalyst used in my country is nearly 200,000 tons, about half of which are taken away with flue gas or catalytic oil slurry and cannot be recycled. About 100,000 tons of spent catalytic cracking catalyst are produced. Treatment methods for spent catalytic cracking catalysts include resurrection, demetallization, and building materials, among which the most valuable is resurrection as a catalyst for reuse. [0003] One cause of deactivation of spent catalytic cracking catalysts is deactivation due to contamination of spent catalytic cracking catalysts with metals such as vanadium, iron and nickel. For spent catalysts with a high content of polluted nickel, nickel removal treatment is required for c...

Claims

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Application Information

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IPC IPC(8): B01J29/90B01J38/02B01J38/04B01J38/10B01J38/12B01J38/66C10G11/05
CPCB01J29/90B01J38/02B01J38/10B01J38/66B01J38/12B01J38/04C10G11/05
Inventor 陈妍林伟朱凯凤孟龙宋海涛
Owner CHINA PETROLEUM & CHEM CORP
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