Method for regenerating FCC waste catalyst via microwave assistance

A waste catalyst, microwave-assisted technology, used in molecular sieve catalysts, chemical instruments and methods, catalyst regeneration/reactivation, etc., can solve the problems of no longer reuse, long operation time, complicated process, etc., to achieve structural integrity and recovery rate. High, simple processing effect

Inactive Publication Date: 2018-06-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that these methods have complex processes, long operation time, high energy consumption, and the use of a large amount of concentrated acid causes the original zeolite structure in the catalyst to be completely destroyed and cannot be reused.

Method used

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  • Method for regenerating FCC waste catalyst via microwave assistance
  • Method for regenerating FCC waste catalyst via microwave assistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 Shown, this microwave-assisted regeneration FCC spent catalyst method, its specific steps are as follows:

[0021] Step 1. First, the spent FCC catalyst (chemical composition includes the following mass percentage components: Al25.95%, Si18.39%, Ce2.05%, La1.09%, V0.59%, Fe0.48%, Ni0. 56%) in a muffle furnace at 600°C for 1 hour, and then mixed with a sodium hydroxide solution with a concentration of 0.1mol / L according to a liquid-solid ratio of 5:1mL / g. After the microwave radiation power is 1600W, the microwave leaching temperature is Alkali leaching at 90°C for 30 minutes to obtain alkali leaching slag and vanadium-containing leaching solution; the removal rate of V after alkali leaching was 32.3%;

[0022] Step 2. Mix the alkali leaching slag obtained in step 1 with the hydrochloric acid solution with a concentration of 5wt% according to the liquid-solid ratio of 10:1mL / g, and then acid-leach for 30min under the conditions of microwave radiation po...

Embodiment 2

[0026] Such as figure 1 Shown, this microwave-assisted regeneration FCC spent catalyst method, its specific steps are as follows:

[0027] Step 1. First, the spent FCC catalyst (chemical composition includes the following mass percentage components: Al26.04%, Si18.69%, Ce2.01%, La1.11%, V0.59%, Fe0.46%, Ni0. 52%) in a muffle furnace at 600°C for 4 hours, and then mixed with a sodium hydroxide solution with a concentration of 0.5mol / L according to a liquid-solid ratio of 5:1mL / g. After the microwave radiation power is 1800W, the microwave leaching temperature is Alkali leaching at 100°C for 30 minutes yielded alkali leaching slag and vanadium-containing leaching solution; the removal rate of V after alkali leaching was 35.59%;

[0028] Step 2. Mix the alkali leaching slag obtained in step 1 with the hydrochloric acid solution with a concentration of 6wt% according to the liquid-solid ratio of 5:1mL / g, and then acid-leach for 20 minutes under the conditions of microwave radiati...

Embodiment 3

[0031] Such as figure 1 Shown, this microwave-assisted regeneration FCC spent catalyst method, its specific steps are as follows:

[0032] Step 1. First, the spent FCC catalyst (chemical composition includes the following mass percentage components: Al26.04%, Si18.69%, Ce2.01%, La1.11%, V0.59%, Fe0.46%, Ni0. 52%) in a muffle furnace at 700°C for 2 hours, and then mixed with a sodium hydroxide solution with a concentration of 0.8mol / L at a liquid-solid ratio of 15:1mL / g, then the microwave radiation power is 400W, and the microwave leaching temperature is Alkali leaching at 50°C for 60 minutes yielded alkali leaching slag and vanadium-containing leaching solution; the removal rate of V after alkali leaching was 27.7%;

[0033] Step 2. Mix the alkali leaching residue obtained in step 1 with the hydrochloric acid solution with a concentration of 1wt% according to the liquid-solid ratio of 3:1mL / g, and then acid-leach for 60min under the conditions of microwave radiation power of 4...

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Abstract

The invention relates to a method for regenerating a FCC waste catalyst via microwave assistance, and belongs to the technical field of integrated recycle of secondary resource. The method comprises:taking a sodium hydroxide solution with the concentration being 0.1-0.8 mol / L as a solvent, performing alkali soaking on an FCC waste catalyst for 10-60 min in microwave radiation at 50-100 DEG C to remove a part of vanadium from the FCC waste catalyst and to obtain a soaked residue and a vanadium-containing soaking liquid; and taking a hydrochloric acid solution with the concentration being 1-8 wt% as a solvent, and performing acid soaking on the obtained soaked residue for 10-60 min in microwave radiation at 50-100 DEG C to obtain a soaking liquid which is abundant in rare earth, iron, vanadium and nickel and a soaked residue of a silicon aluminium salt molecular sieve having a crystal structure. According to the method, rare earth elements are recycled, iron, vanadium and nickel are removed, and the most importance is that the molecular sieve structure is kept and can be used for preparing a new FCC catalyst. The method is simple in treatment process and short in operation time, andthe structure of the silicon aluminium salt molecular sieve in the soaked residue is complete.

Description

technical field [0001] The invention relates to a microwave-assisted method for regenerating spent FCC catalysts, belonging to the technical field of comprehensive recovery and utilization of secondary resources. Background technique [0002] Catalytic cracking (FCC) is one of the core technologies for oil refineries to produce high-value products such as gasoline, diesel, and light olefins from heavy oil. FCC catalyst is the most used catalyst in the process of petroleum smelting. At present, the amount of FCC catalyst used in my country is more than 150,000 tons per year. As crude oil becomes increasingly heavy and inferior, metal compounds in crude oil will be completely decomposed and accumulated on the FCC catalyst during the catalytic cracking process of crude oil. With the continuous recycling of FCC catalysts, the metals deposited on the FCC catalysts will gradually increase, resulting in a decrease in activity and heavy oil conversion capacity. Therefore, cracking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/90B01J38/60B01J38/64
CPCB01J29/90B01J38/60B01J38/64
Inventor 巨少华黎氏琼春彭金辉李熙腾王奇张利波田时泓周澳朱艳芳
Owner KUNMING UNIV OF SCI & TECH
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