A Diesel Liquid-Phase Hydrogenation Decondensation Process

Abstract

The invention discloses a diesel oil liquid-phase hydrogenation decondensation process. Diesel feedstock and circulating oil enter the liquid-phase hydrofining reactor under the condition of liquid-phase hydrogenation, and the material after passing through the hydro-finishing catalyst bed is divided into three strands; one strand of material continues to enter the liquid phase under the condition of liquid-phase hydrogenation decondensation The hydrogenation decondensation reactor carries out the hydrogenation decondensation reaction, the reactant stream undergoes gas-liquid separation and fractionation, and the second stream directly undergoes gas-liquid separation and fractionation to obtain diesel products of different specifications. The present invention provides for the first time a hydrogenation process for simultaneous production of two or more diesel products of different specifications on a set of liquid phase hydrogenation process equipment, which can make full use of the heat carried by part of the hydrogenation refining material to realize liquid phase hydrogenation refining The coupled operation of the reactor and the liquid phase hydrogenation decondensation reactor.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a diesel liquid-phase hydrogenation decondensation process for flexibly producing two high-quality diesel products. Background technique [0002] The increasingly stringent environmental protection regulations require higher and higher quality diesel products, mainly due to the increasing restrictions on sulfur content, cetane number, density and polycyclic aromatic hydrocarbon content. Diesel hydrorefining technology can greatly reduce the sulfur content and aromatics content of diesel products, reduce the density and increase the cetane number. In addition, in winter, diesel products in cold regions have different restrictions and requirements on the freezing point. According to the freezing point, diesel products in my country can be divided into 5#, 0#, -10#, -20#, -35# and -50 # and other different specifications. Hydrogenation decondensation technology can eff...

AI Technical Summary

Problems solved by technology

These methods are to dissolve hydrogen in the diesel raw material for hydrogenation reaction, without using hydrogenation decondensation technology to reduce the freezing point of diesel oil, and the diesel product is relatively simple

[0004] To sum up, the existing diesel hydrotreating technology can obtain a higher yield of diesel products, and the product quality has been greatly improved, such as cetane number, sulfur content, aromatics content, density, etc., but the freezing point depression Little or no reduction, unable to meet the requirements of low pour point diesel

The existing hydrogenation decondensation technology can greatly reduce the freezing point of diesel products, which can meet the index requirements of low-condensing diesel, but the yield of diesel is low, usually less than 90m%, and the quality of diesel products is not greatly improved. When high cetane number n-paraffins are cracked into gas or naphtha fractions, the cetane number of diesel products will be reduced

However, the combination technology of liquid-phase diesel hydrofinishing and hydrodecondensation is seldom used, so the product is single and the flexibility is poor

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