Method for reducing sulfide in light hydrocarbon oil

Abstract

The invention provides a method used for reducing the content of sulfide in light hydrocarbon oil, which comprises the steps as follows: after being preheated, a hydrocarbon oil raw material containing sulfur, and hydrogen donor enter a reactor filled with a sorbent and a zeolite additive so as to react under the conditions as follows: temperature of 300-500 DEG C, pressure of 0.5-3.5MPa, weight hourly space velocity of raw material oil at 0.5-10h<-1> and weight ratio between total amounts of the sorbent and the hydrocarbon oil raw material at 1-20; the materials are separated after reaction; the reaction products are sent to a subsequent separation system so that the product is separated; the sorbent to be regenerated and the zeolite additive to be regenerated after reaction are stripped, burned and regenerated; and the regenerated sorbent and the zeolite additive are reduced by the hydrogen donor and subsequently returned to the reactor so as to be circularly used. The method adds the zeolite additive during the adsorption desulfurization process, realizes deep desulfurization, leads the removal rate of the sulfur to achieve more than 96wt percent when disposing the gasoline, reduces the olefin of the gasoline, improves the octane number of the outcome gasoline simultaneously, keeps high liquid recovery and has low benzene content in the outcome gasoline.

Description

technical field [0001] The present invention pertains to a method for reducing the sulfur content of light petroleum hydrocarbons in the presence of hydrogen or hydrogen-generating compounds. Background technique [0002] As people pay more and more attention to environmental protection, the restrictions on sulfur content in light hydrocarbon oil used as fuel are becoming more and more stringent. Taking gasoline as an example, the U.S. Environmental Protection Agency (EPA) stipulates that the sulfur limit is 30 μg / g (Tier II); Europe requires gasoline sulfur content to be less than 50 μg / g (Euro IV emission standard); China will gradually limit gasoline sulfur content With international standards. Therefore, the hydrocarbon oil must be deeply desulfurized to meet the requirements. [0003] At present, in addition to hydrogenation technology, the deep desulfurization method of oil products, the removal of sulfur compounds in fuel oil by adsorption method is also a very attr...

AI Technical Summary

Problems solved by technology

Although the above-mentioned patents have achieved deep desulfurization of hydrocarbon oils under low hydrogen consumption, the octane number of gasoline products still has a slight loss

[0004] CN1261218C, CN1583973A, and CN1583972A all use zeolite desulfurizers to crack and desulfurize light oil products under non-hydrogen-facing conditions, and selectively crack sulfides to convert them into hydrocarbons and inorganic sulfides without hydrogen consumption and octane loss, but , like heavy oil catalytic cracking desulfurization, its desulfurization rate is affected by the sulfur content of raw materials, catalyst properties and conversion depth, etc., which is not enough to achieve deep desulfurization. The desulfurization rate is generally 50-80%, and it can only be used to produce low-sulfur refined oil. , low octane loss

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