Low-cost combined hydrofinishing method

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 ...

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.

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