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Preparation method for metal capturing agent

A technology of metal trapping agent and waste catalyst, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, catalyst protection, etc., can solve the problems of waste of resources, high safety landfill cost, etc., and achieve Reduce production cost, reduce dry gas and coke yield, and improve the effect of metal capture

Inactive Publication Date: 2017-02-08
QINGDAO HUICHENG PETROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, these waste catalysts are usually landfilled as "hazardous waste" substances, which not only has high safety landfill costs, but also wastes resources. Therefore, the resource utilization of waste catalysts has become an urgent problem to be solved.
[0012] There is no report on the use of spent catalysts to prepare metal traps

Method used

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  • Preparation method for metal capturing agent
  • Preparation method for metal capturing agent
  • Preparation method for metal capturing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) 100 grams of spent catalyst A is beaten with 800 grams of water, and 150 mL of oxalic acid-ammonium fluorosilicate solution is added, and the solution H 2 C 2 o 4 / (NH 4 ) 2 SiF 6 =8:1, its concentration is C 2 o 4 2- Calculated as 100g / L, react at room temperature for 1h.

[0056] (2) Filter the slurry exchanged in step (1), beat the filter cake with 800 g of water, add 240 mL of magnesium nitrate solution, adjust the pH value of the slurry to 3.1 with hydrochloric acid, and exchange at room temperature for 1 h.

[0057] (3) Filter the slurry exchanged in step (2), rinse 53.3mL of lanthanum chloride solution, and dry the filter cake to obtain the title product, which is denoted as SL-1.

Embodiment 2

[0059] (1) 100 grams of spent catalyst B is beaten with 850 grams of water, and 300 mL of oxalic acid-ammonium fluorosilicate solution is added, and the solution H 2 C 2 o 4 / (NH 4 ) 2 SiF 6 =4.5:1, its concentration is C 2 o 4 2- Calculated as 100g / L, react at room temperature for 2h.

[0060] (2) Filter the slurry exchanged in step (1), beat the filter cake with 800 g of water, add 186.6 mL of magnesium nitrate solution, adjust the pH value of the slurry to 3.2 with hydrochloric acid, and exchange at room temperature for 2 hours.

[0061] (3) Filter the slurry exchanged in step (2), rinse with 80.0 mL of lanthanum chloride solution, and dry the filter cake to obtain the title product, which is denoted as SL-2.

Embodiment 3

[0063] (1) 100 grams of spent catalyst C is beaten with 900 grams of water, and 450 mL of oxalic acid-ammonium fluorosilicate solution is added, and the solution H 2 C 2 o 4 / (NH 4 ) 2 SiF 6 =1:1, its concentration is C 2 o 4 2- Calculated as 100g / L, react at room temperature for 3h.

[0064] (2) Filter the slurry exchanged in step (1), beat the filter cake with 800 g of water, add 133.3 mL of magnesium nitrate solution, adjust the pH value of the slurry to 3.2 with hydrochloric acid, and exchange at room temperature for 3 hours.

[0065] (3) Filter the slurry exchanged in step (2), rinse with 100.0 mL of lanthanum chloride solution, and dry the filter cake to obtain the title product, which is designated as SL-3.

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Abstract

The invention relates to a preparation method for a metal capturing agent and also relates to a recycling method for a waste catalyst. The metal capturing agent is applicable to the catalytic cracking process of hydrocarbons with vanadium pollutants. The preparation method comprises the following steps: subjecting waste FCC catalyst, water and an oxalic acid-ammonium fluorosilicate solution to mixing, exchanging and filtering so as to obtain a filter cake; smashing the filter cake and adding a magnesium compound; adjusting a pH value by using hydrochloric acid; subjecting a rare earth compound to filtering and leaching; and drying a filter cake obtained in the previous step so as to obtain the metal capturing agent. The method enables the waste FCC catalyst to be reused; and the prepared metal capturing agent can protect a catalyst, reduce poisoning effect of vanadium on the catalyst and obviously improve the yield of products with value.

Description

[0001] Technical field: The present invention relates to a method for preparing a metal trapping agent, which belongs to the category of catalyst additives for catalytic cracking. Background technique [0002] At present, as the depth of crude oil exploitation continues to increase, the quality of crude oil is further deteriorating, and in the case of high crude oil prices, refineries need to process heavy oil or low-quality oil products in order to reduce costs and maximize benefits. [0003] The content of heavy metals in low-quality oil is generally high, especially vanadium, which generally exists in the form of porphyrin vanadium and non-porphyrin vanadium in crude oil. In the FCC regenerator, vanadium compounds are oxidized to V 2 o 5 , flows through the surface of the catalyst in a liquid state and enters the interior of the molecular sieve, destroying the crystal structure of the molecular sieve. When the vanadium deposited on the catalyst reaches about 10000 μg / g, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J33/00B01J23/847B01J23/94B01J38/48B01J38/60B01J38/62B01J38/66C10G11/02
Inventor 高明军刘惠娟李凤齐萧杜文婷
Owner QINGDAO HUICHENG PETROCHEM TECH
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