Method for producing clean fuels through low-cost hydrogenation

Abstract

The invention discloses a distillate oil two-phase hydroprocessing method, which comprises the following steps of: performing hydrogen saturation on raw materials, hydrogen and circulating hydroprocessing products in a pre-saturation high-pressure tank to form a two liquid-phase mixture of the raw materials, the hydroprocessing products and the hydrogen; separating the hydrogen from the liquid-phase mixture; and putting the mixture with saturated dissolved hydrogen in a single-stage or multi-stage inner cross-flow reactor under the condition of a hydrogenation process. The inner cross-flow reactor adopted by the invention has the functions of catalyzing the hydrogenation reaction and steam stripping the reaction side products such as H2S, NH3 and the like from a reaction system, so the hydrogenation reaction efficiency is greatly enhanced. At the same time, the method does not need a hydrogen circulating link and a circulating hydrogen compressor so as to greatly reduce the equipment investment and the operation cost. The method not only can be applied to hydrogen desulfurization, denitrification and dearomatization for the distillate oil such as gasoline, kerosene, diesel oil and the like, but also can be applied to the technical process for producing high-quality clean fuels by mild hydrocracking the distillate oil such as a VGO raw material.

Description

Technical field [0001] The invention relates to a fixed-bed hydroprocessing method, in particular to a fixed-bed two-phase hydroprocessing method carried out in an internal cross-flow reactor. 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 used as hydrogen feed for the reaction after being pressurized by a circulating hydrogen compressor through a hydrogen circulation link and mixed with fres...

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Problems solved by technology

[0012] U.S. Patents US6213835, US6428686, etc. disclose a hydrogenation process for pre-dissolving hydrogen, which increases the amount of dissolved hydrogen by recycling hydrogenated oil, but it does not solve the problem of H 2 S, NH 3 The problem of removal of harmful impurities, such as harmful impurities, leads to their continuous accumulation in the reactor, which greatly reduces the reaction efficiency

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