Hydrotreating process for light hydrocarbons

Abstract

The invention discloses a lightweight hydrocarbon hydrogenising method, which adopts a first stage countercurrent hydrogenising reactor and a conventional co-current hydrogenising reactor connected in series. The raw material enters into a flash evaporation area of the countercurrent hydrogenising reactor at a lower temperature, gas-phase hydrocarbon flows upwards and performs a reaction of diene and mercaptan producing sulfide and a diene hydrogenising reaction at the upper part of the countercurrent hydrogenising reactor, high boiling sulfide generated by the upper part reaction and liquid-phase hydrocarbon after the raw material flash evaporation flow downwards together, and an alkylation reaction of thiophene sulfur and olefin is generated; Hydrogen enters at the bottom of the countercurrent hydrogenising reactor and flows upwards. Liquid phase discharged at the bottom of the countercurrent hydrogenising reactor and new hydrogen are mixed and enter into the co-current hydrogenising reactor to perform the reactions, such as deep hydrodesulfurization, selective cracking or isomerization and the like after being heated. The method has the advantages that the technological process is simple, the desulphurization effect is good, the octane value loss is low, the product yield is high, and the required equipment is few. The method is mainly used for the secondary processing the poor-quality gasoline, namely, the upgrading process of catalytic cracking gasoline, coking gasoline or thermal cracking gasoline.

Description

technical field [0001] The invention relates to a method for hydrotreating light hydrocarbons, in particular to a hydrodesulfurization process for light hydrocarbons such as gasoline. Background technique [0002] Due to the content of sulfur and olefins in gasoline can increase the CO and NO in automobile exhaust X , SO X The discharge of harmful substances such as particulate matter and particulate matter will cause serious environmental pollution. Therefore, gasoline complying with the new environmental regulations needs to control the content of olefins and minimize the content of aromatics (especially benzene) and sulfur. However, as the quality of petroleum becomes heavier, the main source of gasoline is secondary processed gasoline, among which the catalytic cracking process is the most important processing method for gasoline production. , Desulfurization process technology has been paid attention to, and the most successful ones are various new processes mainly u...

AI Technical Summary

Problems solved by technology

The use of catalytic distillation towers can not only increase the desulfurization rate, but also reduce olefin saturation and octane loss, but the internal components are complicated, the effective volume of the catalyst is small, and the accident treatment efficiency is low. There are still many improvements.

[0004] In addition, since secondary processed gasoline such as catalytic cracking gasoline contains a certain amount of diolefins, using the above treatment process generally requires the use of two hydrogenation reactors, and if the second hydrogenation reaction is operated under suitable conditions , in addition to the two hydrogenation reactors, it is necessary to increase the fractionation tower, which increases equipment investment and correspondingly increases operating costs

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