Low-cost combined hydrofinishing method

A technology of hydrofining and process method, which is applied in the fields of hydrotreating process, petroleum industry, and hydrocarbon oil treatment, which can solve the problems of reducing reaction efficiency, not completely removing harmful impurities, and not being able to effectively handle sulfur, etc., to achieve improved Reaction efficiency, improvement of effective utilization efficiency, and effect of eliminating the influence of wetting factors

Active Publication Date: 2014-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this process, the hydrogenated product is directly recycled to the hydrogen mixer, and the dissolved H 2 S, NH 3 Harmful impurities such as accumulating in the reactor, therefore, this technology does not completely solve the H generated during the reaction 2 S, NH 3 The problem of removal of harmful impurities, such as the removal of harmful impurities, has greatly reduced the reaction efficiency, and cannot effectively process raw materials with high sulfur and nitrogen content.

Method used

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  • Low-cost combined hydrofinishing method

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Effect test

Embodiment 1

[0029] press figure 1 The operation process of the liquid phase circulating hydrogenation reactor and the gas-liquid countercurrent hydrogenation reactor are used in series. The normal third-line diesel (sulfur content 18000μg / g) is used as raw material for hydrofining and desulfurization. The catalyst is FHUDS-5 catalyst developed and produced by Fushun Petrochemical Research Institute. First, the theoretical dissolved hydrogen amount of the reaction system (0.11 wt%) is tested and determined, and then the process of the method of the present invention is carried out. The reaction pressure of liquid phase hydrogenation is 5.0MPa, the reaction temperature is 350℃, and the volumetric space velocity of the fresh raw oil is 4.0h. -1 . The amount of hydrogen mixed in the fixed control oil is 0.12wt% (hydrogen mixing amount / feeding amount, that is, the mixing amount of hydrogen is 1.09 times the saturated dissolved amount of the reaction state), and it is a constant amount, and the...

Embodiment 2

[0037] press figure 1 As shown in the process flow, a liquid-phase circulating hydrogenation reactor and a gas-liquid countercurrent hydrogenation reactor are used in series. Using mixed diesel raw materials (normal third-line straight-run diesel mixed with 30v% catalytic diesel) as raw materials (sulfur content of 13000μg / g, nitrogen content of 550μg / g) for hydrorefining and desulfurization, the catalyst is FHUDS developed and produced by Fushun Petrochemical Research Institute -2 Catalyst. First, the theoretical dissolved hydrogen amount of the reaction system (0.14wt%) is tested and determined, and then the process of the method of the invention is carried out. The pressure of the liquid phase hydrogenation reaction is 6.5MPa, the reaction temperature is 355℃, and the volumetric space velocity of the fresh raw material oil is 3.0h. -1 . The amount of hydrogen mixed in the fixed control oil is 0.15wt% (hydrogen mixed amount / feed amount, that is, the amount of hydrogen mixed...

Embodiment 3

[0045] press figure 1 As shown in the process, a liquid phase circulating hydrogenation reactor and a gas-liquid countercurrent hydrogenation reactor are used in series. The liquid-phase hydrogenation reactor is provided with two hydrogenation catalyst beds, and the catalyst volume ratio of the two catalyst beds is 1:1; the gas-liquid countercurrent hydrogenation reactor is provided with a hydrogenation catalyst bed. Vacuum gas oil (VGO, sulfur content of 1.98wt%, nitrogen content of 2100μg / g) is hydrotreated at 380°C. The catalyst is the FF-24 catalyst developed and produced by Fushun Petrochemical Research Institute. First, the amount of dissolved hydrogen in the reaction system (0.17 wt%) is tested and measured, and then the process of the method of the invention is carried out. The pressure of the liquid phase hydrogenation reaction is 8.0MPa, the reaction temperature is 380℃, and the volumetric space velocity of the fresh raw oil is 2.5h. -1 . The amount of hydrogen mixe...

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Abstract

The invention discloses a low-cost combined hydrofinishing method of oil products. The low-cost combined hydrofinishing method comprises following steps: firstly, hydrogen is mixed with a liquid phase material; the liquid phase material with dissolved hydrogen is delivered into a liquid phase hydrogenation reactor for reaction; an obtained material is delivered into a counter current reactor through the upper part of the counter current reactor, and is further reacted with a small amount of fresh hydrogen which is delivered into the counter current reactor through the bottom of the counter current reactor; and a part of an obtain liquid product is recycled into the liquid phase hydrogenation reactor, and the rest is taken as a hydrogenation products. Compared with existing liquid phase hydrogenation method, the low-cost combined hydrofinishing method is capable of preparing ultra-low-sulfur diesel oil with sulfur content less than 10<mu>g / g directly, and reducing equipment investment and operation cost greatly; and operation is flexible, and raw material adaptability is high.

Description

Technical field [0001] The invention relates to a combined process method of liquid-phase cyclic hydroprocessing and gas-liquid countercurrent hydrogenation, in particular to a method for liquid-phase hydroprocessing by partially circulating gas-liquid countercurrent hydrogenation products without hydrogen sulfide to increase dissolved hydrogen. Background technique [0002] The fixed-bed hydrotreating process is usually a catalytic reaction process to remove impurities such as sulfur, nitrogen, oxygen, and metals in the raw material from crude oil, or to reduce the size of the raw material molecules. In this process, in order to control the reaction temperature of the catalyst bed and avoid the deactivation of catalyst coke deposits, a larger hydrogen-to-oil ratio is usually used. [0003] When a larger hydrogen-to-oil ratio is used for hydroprocessing, there must be a large amount of hydrogen surplus after the hydrogenation reaction is completed. The surplus hydrogen is usually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/02
Inventor 宋永一方向晨刘继华李扬
Owner CHINA PETROLEUM & CHEM CORP
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