A combined process of hydrofining and hydrocracking

Abstract

The invention discloses a hydrorefining and hydrocracking combined process. The wax oil raw material enters the hydrogenation pretreatment reactor, and the material after passing through the upper hydrogenation pretreatment catalyst bed is divided into two streams; one stream of material enters the gas-liquid separator in the middle of the bed, and the gas phase material is drawn out of the hydrogenation pretreatment reactor , mixed with LCO to carry out hydrofining reaction; the other material is the liquid phase in the reactor, the residual flow after extraction and the mixture flow of newly added hydrogen, and continues to flow downward through the lower hydrogenation pretreatment catalyst bed, adding The hydrogen pretreatment stream enters the hydrocracking reactor; the obtained hydrocracking reaction material undergoes gas-liquid separation and fractionation to obtain hydrocracking products such as naphtha, jet fuel, diesel oil, and tail oil; the hydrorefining reaction stream undergoes gas-liquid separation Separation and fractionation yields naphtha and hydrogenated LCO. The invention provides for the first time a combined hydrogenation process for simultaneously producing hydrocracking light products and hydrogenated LCO on a set of hydrogenation process devices.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a combined hydrorefining and hydrocracking process for generating high-quality catalytic cracking raw materials and high-quality hydrocracking products. Background technique [0002] Hydrogenation technology is an important processing method for lightening heavy oil and upgrading the quality of light oil. Hydrocracking technology has developed rapidly due to the advantages of strong feed oil adaptability, good product flexibility, high liquid product yield, and high product quality. The existing hydrocracking technology can be divided into three types according to the processing flow: one-stage series hydrocracking process, single-stage hydrocracking process and two-stage hydrocracking process. One-stage series hydrocracking technology uses two types of catalysts, namely hydrocracking pretreatment catalyst and hydrocracking catalyst, and these two catalysts are load...

AI Technical Summary

Problems solved by technology

[0004] CN106701175A, CN102465035A and CN001896192A disclose a process technology for blending LCO in a hydrotreating process, the main purpose of which is to produce high-quality catalytic cracking raw materials, or to allow LCO to circulate between hydrotreating units and catalytic cracking units. Clean production of cracking units, but because wax oil or residual oil is directly hydrogenated after mixing with LCO, the hydrogenation depth of LCO cannot be effectively controlled, and high-quality hydrocracking products cannot be produced

[0005] In summary, compared with the existing LCO hydrogenation technology and hydrocracking technology, usually LCO is directly blended to the catalytic cracking raw material pretreatment unit for hydrogenation, and then returned to the catalytic cracking unit, or LCO is blended to In the hydrocracking raw oil, after hydropretreatment, it enters the hydrocracking unit to produce hydrocracking naphtha products. In the same unit, wax oil and LCO are used as raw materials to simultaneously produce high-quality hydrocracking products and catalytic cracking products. There are fewer combined processing technologies for raw materials, and there is no combined processing technology for reaction material coupling

Images