Desulphurization sorbent

Abstract

The invention discloses a desulfurization adsorbent, which comprises 1 to 30 weight percent of rare earth-zeolite mixture, 5 to 40 weight percent of active metal oxide and 30 to 94 weight percent of carrier, wherein the carrier comprises alumina and zinc oxide; the rare earth-zeolite mixture and a carrier mixture are preformed into porous heat-resistant solid particles, and then active metal ingredients are introduced on the solid particles to obtain the adsorbent; and a light hydrocarbon oil raw material containing sulfur and a hydrogen donor enter a reactor filled with the adsorbent, materials remained after the reaction are separated, a reaction product is sent into a subsequent separation system for product separation, a spent adsorbent after the reaction is steam-stripped and then is subject to coke-burning regeneration, and the regenerated adsorbent is reduced by the hydrogen donor and is returned to the reactor for cyclic use. The adsorbent realizes the deep removal of sulfide in light hydrocarbon oil, and the produced gasoline has higher octane number, lower benzene content, and higher strength at the same time.

Description

technical field [0001] The invention belongs to an adsorbent for reducing sulfur content in light petroleum hydrocarbons and its preparation and application. 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 attractive technology in recent years....

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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