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Delayed coking-hydrofining-catalytic cracking combined technology

A technology of hydrorefining and delayed coking, applied in hydrotreating process, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problems of insufficient catalytic cracking raw materials, loss of secondary processing equipment, and inability to leave the factory.

Inactive Publication Date: 2017-01-11
锡山区绿春塑料制品厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the one hand, the processing of high-sulfur crude oil is likely to cause the sulfur content of catalytic cracking products, especially gasoline, to exceed the standard, which cannot meet the environmental protection requirements and cannot be shipped, resulting in a shortage of qualified raw materials for catalytic cracking
On the other hand, it is difficult for delayed coking high-sulfur and high-nitrogen wax oil (CGO) to exit
CGO has the characteristics of high content of sulfur, nitrogen, fused-ring aromatics and carbon particles. The basic nitrogen (total nitrogen is generally above 2500 μg / g) and fused-ring aromatics will cause serious poisoning and carbon deposition of catalytic cracking catalysts, resulting in a lower conversion rate. The yield of gasoline and gasoline is obviously reduced, the carbon particles are blocked and the feed nozzle of the catalytic cracking riser reactor is worn; if it is used as a hydrocracking raw material, it will also affect the activity of the cracking catalyst due to its high nitrogen content; if it is directly blended as fuel oil, then Also lost part of the raw materials of the secondary processing unit, affecting the economic benefits of the refinery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The catalyst was prepared by impregnation method, and the carrier was doped Co 2+ MCM-41, Co. 2+ The doping amount in MCM-41 is controlled at 0.65% of the mass of the carrier. The active component molybdenum nitride MO 2 N, tungsten nitride W 2 N, molybdenum carbide Mo 2 The total content of C and tungsten carbide WC is 10% of the mass of the carrier, and their molar ratio is 1:0.4:0.3:0.8.

[0037] The catalyst is loaded into a fixed bed reactor, the reaction tube of the reactor is made of stainless steel with an inner diameter of 50mm, the catalyst bed is set to 3 layers, the temperature of the catalyst bed is measured by a UGU808 temperature control meter, and the raw material is from Beijing The double-plunger micropump manufactured by the satellite manufacturing plant is continuously transported. The hydrogen is supplied by a high-pressure gas cylinder and the flow rate is controlled by a Beijing Qixing Huachuang D07-11A / ZM gas mass flow meter. The hydrogenatio...

Embodiment 2

[0042] The catalyst was prepared by impregnation method, and the carrier was doped Co 2+ MCM-41, Co. 2+ The doping amount in MCM-41 is controlled at 0.7% of the carrier mass. The active component molybdenum nitride MO 2 N, tungsten nitride W 2 N, molybdenum carbide Mo 2 The total content of C and tungsten carbide WC is 10% of the mass of the carrier, and the molar ratio is 1:0.6:0.45):1.2.

[0043] All the other conditions are the same as in Example 1.

[0044] The final product was tested and the total sulfur content was reduced to 3ppm with no change in catalyst bed pressure drop.

Embodiment 3

[0069] The catalyst contains catalyst promoter TiO 2 , CeO 2 , V 2 o 5 and NbOPO 4 , its content is respectively 1%, 1.5%, 1% and 3%, all the other are identical with embodiment 1.

[0070] The final product was tested, and after 3 months of use, the pressure drop of the catalyst bed did not change, which was 18% lower than the pressure drop of the catalyst bed in Example 1 for the same use time.

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PUM

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Abstract

The invention discloses a delayed coking-hydrofining-catalytic cracking combined technology. A delayed coking unit, a hydrofining unit and a catalytic cracking unit are involved in the combined technology. Coking raw materials are heated through a heating furnace and enter a coking tower, coke and light products are generated, the light products are fractionated through a fractionating tower, and naphtha, gasoline, diesel oil and coker gas oil are obtained; the coker gas oil is filtered to remove particles with the size larger than 25 micrometers, is heated through the heating furnace together with other optional high-sulfur vacuum gas oil and then is mixed with hydrogen, the mixture enters a hydrofining device, an obtained gas phase is returned after being treated and then is mixed with hydrogen, hydrofined oil is obtained and enters a catalytic cracking device together with optional vacuum residuum or atmospheric residuum, cracking gas, catalytic gasoline, diesel oil and catalytic cracking slurry oil are obtained, and the catalytic cracking slurry oil and coking raw materials are mixed and enter the delayed coking unit together. By means of the technology, CGO and VGO can be effectively treated, the sulfur content in a product can be controlled to be 5 ppm or lower, and the service life of a hydrogenation catalyst can reach 2 years or longer.

Description

technical field [0001] The invention relates to a delayed coking-hydrofining-catalytic cracking combined process, in particular to a delayed coking-hydrofining-catalytic cracking combined process using a specific catalyst for hydrofining. Background technique [0002] Delayed coking is a petroleum secondary processing technology, which refers to the deep thermal cracking and condensation reaction at high temperature (about 500 ° C) using hydrogen-poor heavy oil as raw material to produce gas, gasoline, diesel oil, wax oil, and coke technology. The so-called delay means that the coking oil (raw oil and circulating oil) is heated to the coking reaction temperature rapidly through the heating furnace, and no coke is formed in the reaction furnace tube, but enters the coke tower for coking reaction, so there is a delay effect, which is called delay coking technology. [0003] As the world's crude oil becomes heavier and inferior, the sulfur content of crude oil is getting high...

Claims

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Application Information

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IPC IPC(8): B01J29/04C10G69/06
CPCB01J29/045B01J2229/18C10G69/06C10G2300/202C10G2400/02C10G2400/04
Inventor 朱忠良
Owner 锡山区绿春塑料制品厂