Low-hydrogenloss hydrogenation of high-output qulified diesel oil

Abstract

A low-hydrogen-consumption hydrogenation method that produces high-quality diesel oil. The raw oil is mixed with the reaction effluent of the hydrocracking reactor, and enters the hydrotreating reactor for hydrofinishing reaction and light hydrocracking reaction of heavy distillate oil; the reaction effluent of the hydrotreating reactor is cooled and separated Finally, the light naphtha fraction, heavy naphtha fraction, diesel fraction and tail oil fraction are separated; the tail oil fraction is recycled to the hydrocracking reactor for hydrocracking reaction; the hydrogen-rich gas separated from the high-pressure separator is combined with After the optional fresh hydrogen is mixed, it enters the hydrocracking reactor. The present invention organically combines hydrotreating and hydrocracking, uses the mixed raw material of vacuum gas oil and optional catalytic cracking diesel oil, under mild reaction conditions and low hydrogen consumption, can produce the largest amount of low-sulfur, low-nitrogen , high-quality diesel products with low aromatics and high cetane number, which can meet the requirements of Euro IV fuel specifications for diesel.

Description

technical field [0001] The invention relates to a hydrocarbon oil cracking method for obtaining low-boiling fractions in the presence of hydrogen, more specifically, the invention is a low-hydrogen-consumption hydrogenation method for producing more high-quality diesel oil. Background technique [0002] With the increasing awareness of environmental protection around the world, many countries have established stricter standards for petroleum products, especially for motor fuels. my country began to implement Euro III emission standards in some major cities in 2005, and will implement more stringent Euro IV emission standards in 2008. Among them, Euro IV specifications for diesel require a density of 0.820-0.845g / cm 3 Within the range, the sulfur content≯50ppm, the polycyclic aromatic hydrocarbon content≯11% by weight, and the cetane number≮51. Judging from the demand trend of oil products in my country, the supply of diesel oil has always been in short supply, and the requi...

AI Technical Summary

Problems solved by technology

In this invention, the high-pressure, high-temperature separator has limited accuracy in stripping and separating the gas phase stream, and part of the middle distillate oil is mixed into the liquid phase stream and recycled back to the hydrocracking reactor, which reduces the yield of the middle distillate oil; at the same time, the high pressure, The establishment of high temperature stripping separator increases investment and operating costs

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