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Liquefied gas and FCC (fluid catalytic cracking) gasoline combined desulfurization process

A desulfurization process, liquefied gas technology, applied in the petroleum industry, hydrotreating process, gas fuel and other directions, can solve the problems of harsh operating environment, loss of amine liquid, shorten the life cycle of alkali liquid, etc., to simplify the processing process, use The effect of improving performance and saving start-up cycle

Active Publication Date: 2014-12-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) When the total sulfur content in the feed gas is high, the desulfurization effect is difficult to reach the design target
(2) The desulfurization rate is not stable enough
When the new lye is replaced, the total sulfur content of the product is low, but after a certain period of operation, the total sulfur content of the product gradually increases, and the pre-alkali washing lye needs to be replaced frequently
(3) Severe amine liquid foaming is prone to occur when hydrogen sulfide is removed, causing amine liquid entrainment, resulting in a large loss of amine liquid, requiring frequent rehydration, which affects the safety, stability, and long-term operation of the device
(4) The content of disulfide and sodium mercaptide in the regenerated lye is likely to exceed the standard, and it is easy to cause secondary pollution to the refined liquefied gas, shorten the life cycle of the lye, and cause a large amount of alkali slag discharge
(5) Sulfonated cobalt phthalocyanine catalysts are easy to aggregate and deactivate in the alkali phase, resulting in frequent replacement of catalysts and increasing catalyst costs
(6) Sulfuric acid neutralization method is mostly used for alkali slag treatment, which not only wastes acid resources and increases production costs, but also releases a large amount of H after sulfuric acid neutralization 2 Odor gases such as S and RSH cause air pollution, and the operating environment is harsh, becoming the main source of odor pollution in refineries
(7) Large amount of alkaline sewage discharge
However, this type of technology is usually suitable for liquefied gas with a small amount of sulfur treatment or low sulfur content, and has disadvantages such as small sulfur capacity of the adsorbent and high regeneration costs.

Method used

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  • Liquefied gas and FCC (fluid catalytic cracking) gasoline combined desulfurization process
  • Liquefied gas and FCC (fluid catalytic cracking) gasoline combined desulfurization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The sulfur transfer catalyst used in this example is labeled ST-1, and the directional desulfurization catalyst is labeled SDS-1. Among them, the sulfur transfer catalyst ST-1 is based on γ-Al 2 o 3 As a carrier (carrier pore volume>0.6ml / g, specific surface>200m 2 / g), using the equal volume impregnation method to distribute and impregnate 10.0wt% molybdenum trioxide (using heptahydrate ammonium molybdate as precursor) and 6.0wt% nickel oxide (using hexahydrate) of the total mass of the catalyst to impregnate the total mass of the catalyst Nickel nitrate as the precursor), aging at room temperature for 2 hours, drying at 120°C for 2 hours after each impregnation, and then roasting at 500°C for 2 hours; and then vulcanizing with sulfide to obtain the ST-1. The directional desulfurization catalyst SDS-1 is based on γ-Al 2 o 3 As a carrier (carrier pore volume>0.6ml / g, specific surface>200m 2 / g), using the equal volume impregnation method to distribute and impregnat...

Embodiment 2

[0028] The sulfur transfer catalyst used in this example is marked as ST-2, and the directional desulfurization catalyst is marked as SDS-2, both of which are based on modified barium zeolite, and the pore diameter of the barium zeolite is 0.35-0.39nm , the density is 2.7~2.8g / cm 3 , and the barium zeolite is treated with a mixed aqueous solution of 1.5wt% sulfamic acid and 5wt% hydrochloric acid for 10 to 12 hours, then neutralized to neutral by alkali, washed and dried, and then calcined at 500°C for 1.5 to 2.0 hours; then add a dispersant with a mass of 0.8 to 1.0 times the mass of the barium zeolite and stir and mix for 20 to 30 minutes to obtain a mixed slurry and grind it; finally filter the ground slurry and dry it at 150 The modified barium zeolite can be obtained by vacuum drying at ℃; wherein the dispersant is a compound with the following structure:

[0029]

[0030] In the structure, m1 and n1 are integers, and 10≤m1≤18, 2≤n1≤5. It can be prepared by ring-open...

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Abstract

The invention relates to a liquefied gas and FCC (fluid catalytic cracking) gasoline combined desulfurization process which comprises the following steps: (1) mixing sulfur-containing liquefied gas and FCC gasoline, and feeding into a sulfur transfer reactor, wherein light-weight sulfur-containing compounds in the mixture are changed into high-boiling-point sulfide in the presence of a catalyst; (2) feeding the reaction product into a stabilizing tower, thus obtaining a liquefied gas product having a low sulfur content at the tower top and FCC gasoline containing high-boiling-point sulfide at the tower bottom; (3) feeding the FCC gasoline into a fractionating tower, and performing fraction separation, wherein light gasoline having a low sulfur content is generated at the tower top; and (4) mixing heavy gasoline containing high-boiling-point sulfide with hydrogen gas, then feeding into a hydrodesulfurization reactor, and performing desulfurization to obtain low-sulfur heavy gasoline. The process provided by the invention greatly simplifies the process flow, and has the advantages of simple operation, favorable desulfurization effect, wide raw material applicability and no secondary pollution; and meanwhile, the process can also meet the requirements of refinery enterprises for different processing depths of liquefied gas and the requirements for low-cost production of clean gasoline conforming to national IV and V standards.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, more specifically, the invention relates to a combined desulfurization process or method of liquefied gas and FCC gasoline. Background technique [0002] In the process of petroleum refining, liquefied petroleum gas (LPG) produced by catalytic cracking, delayed coking and other devices contains a large amount of sulfide, except for H 2 S, COS, CS 2 In addition to acidic components such as mercaptans and thioethers, there are organic sulfurs such as mercaptans and sulfides, among which methyl mercaptan and ethanethiol are the main ones. Due to the high toxicity, high volatility, corrosiveness and stench of mercaptan, it causes great pollution to the environment. As the scale of my country's oil refining process continues to grow and the depth of liquefied gas processing continues to increase, more and more refineries process by-product liquefied gas into high-octane MTBE, alkylate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02C10L3/10
Inventor 柴永明刘晨光刘宾柳云骐白锐赵晋翀杜健吕洪伟邢金仙
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)