System and method for removing sulfur dioxide from liquid-phase hydrocarbons

Abstract

The invention discloses a system and a method for removing sulfur dioxide from liquid-phase hydrocarbons. Liquid-phase hydrocarbons containing sulfur dioxide are not subjected to alkali washing and water washing, the water content is 0-100 ppm, the liquid-phase hydrocarbons are directly fed from the bottom of an adsorption tank filled with a sulfur dioxide adsorbent, sulfur dioxide in the liquid-phase hydrocarbons is removed through adsorption, and the content of sulfur dioxide in the adsorbed liquid-phase hydrocarbons can be smaller than 1 ppm. When the adsorbent is saturated or reaches a certain standard, the adsorbent can be regenerated on line. And the two or more adsorption tanks can be used for alternately adsorbing and regenerating. Compared with the prior art, the method has the advantages that the process is simple, the removal precision is high, the regeneration period is long, and the adsorbent is easy to regenerate; and the adsorbent regeneration unit performs online regeneration on the sulfur dioxide adsorbent by using high-temperature nitrogen and air, so that the operation is simple and practical, the operation is reliable, the control is simple and convenient, and the like.

Description

technical field [0001] The invention relates to the field of petrochemical technology, in particular to a system and method for removing sulfur dioxide from liquid-phase hydrocarbons. Background technique [0002] Catalysts in petrochemical plants are often sensitive to impurities in the feed, and the presence of some impurities can cause catalyst deactivation. If the hydrocarbon feed contains sulfur dioxide impurities, it will cause poisoning and deactivation of catalysts in some devices, which will affect the normal operation of the devices and need to be removed. Sulfur dioxide contained in gas phase hydrocarbons can be directly removed by alkali washing, but high-precision removal of sulfur dioxide in liquid phase hydrocarbons is a difficult problem in the industry. [0003] The removal methods of sulfur dioxide in liquid phase hydrocarbons mainly include alkaline washing and adsorption. In the alkali washing method, the reaction between lye and sulfur dioxide is mainl...

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Problems solved by technology

[0005] CN104557388A discloses a deep desulfurization method for C4 in a refinery, which uses at least two fixed-bed reactors for adsorption. The raw material for this method is C4 in the refinery, and the sulfur in C4 is mainly hydrogen sulfide and organic sulfur, and The minimum sulfur content in the material after adsorption by this method is 7ppm, which does not meet the requirement of controlling the sulfur content below 1ppm

This patent application describes the preparation method of transition metal Y-type molecular sieve adsorbent in detail, but does not involve sulfur dioxide removal device and adsorbent regeneration device

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