Mixed crystal phase catalytic cracking flue gas sulfur transfer agent prepared by secondary growth method and its application

A technology of catalytic cracking and mixed crystal phases, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of reducing the number of desulfurization active centers of sulfur transfer agents and the decline in the function of silica to enhance strength, etc., to achieve Enhanced desulfurization effect and service life, good desulfurization activity, widening composition range

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, and silicon dioxide and magnesium oxide will react with magnesium oxide to form magnesium silicate during long-term operation, which reduces the number of desulfurization active centers of the sulfur transfer agent and also makes Functional decline in silica enhanced strength

Method used

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  • Mixed crystal phase catalytic cracking flue gas sulfur transfer agent prepared by secondary growth method and its application
  • Mixed crystal phase catalytic cracking flue gas sulfur transfer agent prepared by secondary growth method and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 43.77gMgSO 4 , 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 In O, prepare solution A, and stir at room temperature (to make the slurry rotate rapidly, but not so that the slurry flies out of the beaker) for 4 hours; dissolve 30g NaOH 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 with a polytetrafluoroethylene liner, crystallize at 80°C for 18h, then cool, suction filter, wash until neutral, dry at 120°C for 10h, and roast at 700°C for 2h to obtain the intermediate product Z1; 16.8gAlCl 3 Dissolve in 20ml of deionized water to obtain solution D, and impregnate solution D on Z1 by multiple impregnation methods of equal volume, then dry a...

Embodiment 2

[0042] 22.8gMgSO 4 , 11.4gMg(NO 3 ) 2 ·6H 2 O, 9.58gMgCO 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 with a polytetrafluoroethylene liner, crystallize at 90°C for 20h, then cool, filter with suction, wash until neutral, dry at 120°C for 10h, and roast at 800°C for 2h to obtain the intermediate product Z2; 30.21gAl 2 (SO 4 ) 3 Dissolve in 50ml of deionized water to obtain solution D, and impregnate solution D on Z2 by multiple impregnation methods of equal volume, then dry at 120°C for 10h, ...

Embodiment 3

[0044] 30.13gMgCl 2 ·6H 2 O, 38.54gC 4 h 6 o 4 Mg·6H 2 O, 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 with a polytetrafluoroethylene liner, crystallize at 70°C for 17h, then cool, suction filter, wash until neutral, dry at 110°C for 10h, and roast at 800°C for 2h to obtain the intermediate product Z3; 16.8gAlCl 3 Dissolve in 20ml of deionized water to obtain solution D, and impregnate solution D on Z3 by multiple impregnation methods of equal volume, then dry at 120°C for 10h, and b...

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Abstract

The invention provides a catalytic cracking flue gas sulfur transfer agent with mixed crystal phase and its preparation method and application. The sulfur transfer agent uses three mixed crystal phases of magnesium oxide, magnesium titanate and magnesium aluminum spinel as desulfurization Carrier and desulfurization active center, loaded with metal oxide as redox promoter, prepared by secondary growth method, based on the total weight of the sulfur transfer agent, in which magnesium oxide, magnesium titanate, magnesium aluminum spinel and The mass percentages of the metal oxides are 1%-50%, 1%-90%, 1%-90% and 5%-50%, respectively. The invention utilizes the titanium-magnesium structural material and the magnesium-aluminum spinel material to form a composite structure, greatly enhances the desulfurization effect and service life of the sulfur transfer agent, and widens 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, and 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 unit 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 sulf...

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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