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Low-temperature reduced catalytic cracking flue gas sulfur-transfer agent and preparation process thereof

A catalytic cracking, flue gas sulfur technology, applied in catalytic cracking, chemical instruments and methods, cracking, etc., can solve problems such as unsatisfactory use effect

Active Publication Date: 2013-02-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalytic cracking unit operated by MIP process in a refinery of Sinopec used imported sulfur transfer agent, and the effect was very unsatisfactory

Method used

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  • Low-temperature reduced catalytic cracking flue gas sulfur-transfer agent and preparation process thereof
  • Low-temperature reduced catalytic cracking flue gas sulfur-transfer agent and preparation process thereof
  • Low-temperature reduced catalytic cracking flue gas sulfur-transfer agent and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Magnesium oxide (specific surface area greater than 150m 2 / g), pseudo-boehmite (specific surface area greater than 400m 2 / g) and cerium oxide are ground in a high-speed shear mixer; spray-dried, sieved at 100-150 microns, calcined at 700°C for 4 hours, then hydrated and impregnated with ammonium metavanadate, dried, and calcined at 700°C for 4 hours to obtain a low-temperature Reduced catalytic cracking flue gas sulfur transfer agent S1; the magnesium-aluminum molar ratio in the product is 4, calculated on a dry basis of oxides, magnesium-aluminum oxide accounts for 80wt%, cerium oxide accounts for 17.5wt%, and vanadium pentoxide is Base accounted for 2.5wt%.

Embodiment 2

[0036] Magnesium hydroxide (specific surface area greater than 20m 2 / g), pseudo-boehmite (specific surface area greater than 400m 2 / g) and cerium oxide were ground in a colloid mill; then hydrated and impregnated with ammonium metavanadate, dried, and calcined at 750°C for 2h; after extrusion, sieved at 50-100 microns, calcined at 750°C for 2h to obtain low-temperature reduced Catalytic cracking flue gas sulfur transfer agent S2; the magnesium-aluminum molar ratio in the product is 3, calculated on a dry basis of oxides, magnesium-aluminum oxide accounts for 80wt%, cerium oxide accounts for 15wt%, and vanadium pentoxide accounts for 5wt%.

Embodiment 3

[0038] Magnesium aluminum carbonate hydrotalcite (single sheet thickness less than 20nm) is ultrasonically ground, hydrated and impregnated with cerous nitrate, dried, and calcined at 750°C for 2 hours; granulated, sieved at 50-150 microns, and calcined at 750°C The low-temperature reduced catalytic cracking flue gas sulfur transfer agent S3 was prepared in 2 hours; the magnesium-aluminum molar ratio in the product was 4, and the magnesium-aluminum oxide accounted for 80wt% and the cerium oxide accounted for 20wt% based on the oxide dry basis.

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Abstract

The invention belongs to the technical field of flue gas desulfurization of the petroleum refining industry and discloses a high-efficiency catalytic cracking flue gas sulfur-transfer agent which has the good reduction ability at the low temperature and a preparation process thereof. A mechanical dispersing grinding high-specific-surface-area magnesia-alumina source and other element compounds are used, and the high-dispersion and high-sphericity-degree low-temperature reduced catalytic cracking flue gas sulfur-transfer agent is obtained through a method comprising the steps of forming, screening, roasting and hydration. According to the agent and the process, raw materials which are small in particle and large in specific surface area are preferred, and the produced catalytic cracking flue gas sulfur-transfer agent is uniform in particle and good in metal ion dispersion, so that sulfur oxides can be attached to the surface of the sulfur-transfer agent in a good mode, sulfate can be reduced at the low temperature (below 500 DEG C), the sulfur absorption of the sulfur-transfer agent is good in Sox adsorption capacity and oxidative sulfur absorption rate, the reduction performance is good, the agent and the process are applicable to catalytic cracking devices having requirements for the reduction temperature, the reduction temperature is reduced, and effects of energy conservation, emission reduction, low carbon and environmental protection are achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization in the oil refining industry, and in particular relates to a high-efficiency catalytic cracking flue gas sulfur transfer agent with excellent reducing ability at low temperature (lower than 500°C) and a preparation method thereof. Background technique [0002] Fluid catalytic cracking (FCC) is an important process for the production of gasoline, diesel and liquefied petroleum gas in today's petroleum industry. Typically, about 45% to 55% of the sulfur in the FCC feedstock is converted to H in the reactor 2 S, into the dry gas; 35%~45% into the liquid product; 5%~10% is deposited on the surface of the catalyst, brought into the regenerator with the coke, and generates SOx during the regeneration process (generally 90% of SO 2 and 10% SO 3 mixture), which are discharged into the atmosphere along with the flue gas. SOx not only corrodes equipment, but also directly leads to the fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/81B01D53/02B01D53/50C10G11/00B01J20/08B01J20/30
Inventor 霍志萍宋家庆徐向宇孔颉琛
Owner BEIJING UNIV OF CHEM TECH
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