Mixed crystal phase catalytic cracking flue gas sulfur transfer agent and its preparation method and application

A catalytic cracking and sulfur transfer agent technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as the decrease in the function of silica to enhance strength, reduce the number of sulfur transfer agent desulfurization active centers, etc. Enhance the desulfurization effect and service life, widen the composition range, and improve the desulfurization activity.

Inactive Publication Date: 2016-03-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carriers such as kaolin contain about 40% of silicon dioxide. During long-term operation, silicon dioxide and magnesium oxide will react with magnesium oxide to form magnesium silicate, which reduces the number of desulfurization active centers of the sulfur transfer agent and also makes the Functional decline in silica enhanced strength

Method used

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  • Mixed crystal phase catalytic cracking flue gas sulfur transfer agent and its preparation method and application
  • Mixed crystal phase catalytic cracking flue gas sulfur transfer agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 43.77gMgSO 4 , 16.8gAlCl 3 , 30.16gTi(SO 4 ) 2 9H 2 O, 15.15gFe(NO 3 ) 3 9H 2 O, 9.06gCu(NO 3 ) 2 ·3H 2 O dissolved in 200gH 2 O, prepared as solution A, and stirred at room temperature for 4h; dissolved 30g NaOH in 200gH 2 In O, configure solution B; add solution A dropwise to solution B heated in a 60°C water bath with vigorous stirring (to make the slurry rotate quickly, but not to prevent the slurry from flying out of the beaker), and continue stirring for 4 hours after the addition is completed , to obtain slurry C, keep the pH value of the slurry ≥ 10 during the whole mixing process, put slurry C into a reaction kettle with polytetrafluoroethylene lining, crystallize at 80°C for 18h, then cool, filter, and wash until neutral , dried at 120°C for 10h, and calcined at 700°C for 2h to obtain the product W1.

Embodiment 2

[0039] 22.8gMgSO 4 , 11.4gMg(NO 3 ) 2 ·6H 2 O, 9.58gMgCO 3 , 17.47gAl 2 (SO 4 ) 3 , 40.24gTi(SO 4 ) 2 9H 2 O, 15.15gFe(NO 3 ) 3 9H 2 O, 6.78gCe(NO 3 ) 3 ·6H 2 O dissolved in 200gH 2 O, prepared as solution A, and stirred at room temperature for 4h; 30gNaOH, 10gKOH were dissolved in 200gH 2 In O, configure solution B; add solution A dropwise to solution B heated in a vigorously stirred 60°C water bath, continue stirring for 4 hours after the addition is complete, to obtain slurry C, and keep the pH value of the slurry ≥ 10 during the entire mixing process , Put the slurry C into a reaction kettle lined with polytetrafluoroethylene, crystallize at 90°C for 20h, then cool, filter with suction, wash until neutral, dry at 110°C for 10h, and roast at 700°C for 2h to obtain product W2.

Embodiment 3

[0041] 30.13gMgCl 2 ·6H 2 O, 38.54gC 4 h 6 o 4 Mg·6H 2 O, 16.8g AlCl 3 , 47.12gC 16 h 36 o 4 Ti, 6.77gSr(NO 3 ) 2 , 3.67gZn (NO 3 ) 2 ·6H 2 O was dissolved in 200g of absolute ethanol, prepared as solution A, and stirred at room temperature for 4h; 25gNaOH, 15gKOH, 8gNaCO 3 Soluble in 200gH 2 In O, configure solution B; add solution A dropwise to solution B heated in a vigorously stirred 60°C water bath, continue stirring for 4 hours after the addition is complete, to obtain slurry C, and keep the pH value of the slurry ≥ 10 during the entire mixing process , put the slurry C into a reaction kettle lined with polytetrafluoroethylene, crystallize at 70°C for 17h, then cool, filter with suction, wash until neutral, dry at 110°C for 10h, and roast at 800°C for 2h to obtain product W3.

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Abstract

The invention provides a catalytic cracking flue gas sulfur transfer agent adopting mixed crystal phases as well as a preparation method and application thereof. The sulfur transfer agent is prepared by using three mixed crystal phases including magnesium oxide, magnesium titanate and magnesium aluminate spinel as desulfurization carriers and desulfurization active centers, and loading metal oxides as redox accelerants by adopting a reverse coprecipitation method, wherein based on the total weight of the sulfur transfer agent, the mass percents of magnesium oxide, magnesium titanate, spinel and the metal oxides are respectively 1-50%, 1-90%, 1-90% and 5-50%. The sulfur transfer agent has the beneficial effects that a composite structure is formed by utilizing titanium-magnesium structure materials and a magnesium aluminate spinel material, thus greatly enhancing the desulfurization effect of the sulfur transfer agent and prolonging the service life of the sulfur transfer agent as well as expanding the composition range of the sulfur transfer agent.

Description

technical field [0001] The invention relates to a catalytic cracking flue gas sulfur transfer agent with mixed crystal phases and its preparation method and application. Background technique [0002] Catalytic cracking (FCC) unit is one of the units with serious pollution emissions in refineries. In recent years, with the increase of sour crude oil processed by refineries, the sulfur content of catalytic cracking feedstock has also been increasing. It is reported that about 45-55% of the sulfur in the feedstock is converted to H in the reactor 2 S enters the dry gas, about 35-45% enters the liquid product, about 5-10% is brought into the regenerator with the coke, and generates SO when it is burnt X (where SO 2 About 90%, SO 3 about 10%), becoming the FCC device SO x origin of. SO x It is discharged into the atmosphere together with the flue gas, which not only causes serious equipment corrosion, but also aggravates environmental pollution. [0003] The use of sulfur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50B01J21/10B01J23/745B01J23/83B01J23/06
Inventor 张强王萍李春义金萍王斌
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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