An adsorbent for removing sulfur and oxygen-containing impurities in light hydrocarbon streams and its preparation and regeneration methods

Abstract

The invention relates to an adsorbent used for removing impurities containing sulfur and oxygen in light dydrocarbon material flow, and a preparation and regeneration method of the adsorbent. The preparation method of the absorbent comprises the following steps: with molecular sieve raw powder and active aluminum oxide as raw materials, chambering by virtue of organic amine and modifying by virtue of metal ions, then adding an adhesive for rolling forming, drying at the low temperature, and roasting and activating at the high temperature to prepare the absorbent; the prepared absorbent comprises Al2O3, SiO2, alkali metal oxide and trace rare-earth metal oxide; the particle diameter of the absorbent is 1.0mm-4.2mm; the specific surface area is 260m<2> / g-320m<2> / g; the pore volume is 0.3ml / g-0.35ml / g. The absorbent is modified by introduced rare earth metals which are matched with alkali metals; sodium silicate is further introduced to serve as the adhesive; the selectivity and the adsorption capacity for polar molecules are greatly improved; the overall adsorption heat is reduced; the adsorption rate of the adsorbent for methyl alcohol can reach 99.2%, and the adsorption capacity can reach 6.7%; the preparation method of the adsorbent is simple; the prepared adsorbent can be regenerated and cyclically used; the regeneration method of the adsorbent is simple; the resource utilization rate is improved.

Description

technical field [0001] The invention relates to an adsorbent and its preparation and regeneration method, in particular to a method for removing sulfur and oxygen impurities such as COS and CS in light hydrocarbon streams. 2 、H 2 S, CO 2 Adsorbents for water and water etc. and methods for their preparation and regeneration. Background technique [0002] In chemical production, with the emergence of new technologies and the replacement of catalysts, the requirements for impurities in raw materials are getting higher and higher. In recent years, with the seriousness of heavy and inferior crude oil and the continuous renewal of coal chemical products, the impurity content in hydrocarbon materials has been increasing, especially the content of impurities such as sulfur and oxygen compounds. These substances are very toxic to catalysts in the further processing of hydrocarbons. Among these sulfur-containing and oxygen-containing compounds, COS and CS are more toxic to the cat...

AI Technical Summary

Problems solved by technology

Although the above methods can effectively remove COS, the most widely used method is still to remove COS by hydrolysis. Patents CN101590392A, CN102463107A, CN101239319A, etc. all mention the preparation of COS hydrolysis catalysts. These catalysts are all supported by alumina The main difference is that the supported metal oxides are different, and the H produced after hydrolysis 2 S needs a desulfurizer such as zinc oxide to remove it, and the process is longer

Patent CN101912774B—a catalyst for hydrolyzing carbonyl sulfide at low temperature and its preparation method Provides a catalyst for hydrolyzing carbonyl sulfide at low temperature, but from the principle of COS hydrolysis, it can be seen that if COS is to be completely removed, the material must be guaranteed The water content in COS is higher than that of COS. On the contrary, the hydrolysis of COS may not be complete, which will affect the removal depth. In addition, how to remove the CO produced after hydrolysis 2 None of these patents using hydrolysis to remove COS

In addition, adsorption refining, as a popular process in recent years, has also been used in COS removal. The patent application publication number CN1180870C discloses a one-step carbonyl sulfide desulfurization agent, using activated carbon as a carrier, adding a certain amount of metal oxides, Modifier and mass transfer accelerator are prepared; the patent application publication number of CN103506071A discloses a cleaning agent for adsorbing hydrogen sulfide and carbonyl sulfide in the tail gas of natural gas and its preparation method. The cleaning agent is supported by activated carbon, soluble Zinc salts and soluble copper salts are active components, loaded on activated carbon carriers, and are suitable for purification of ppm-level hydrogen sulfide and carbonyl sulfide gases in natural gas tail gas used in factories and laboratories; the patent application publication number CN102600850A discloses A method for preparing a catalyst for simultaneously removing carbonyl sulfide and carbon disulfide, which is prepared by using microwave activated carbon as a carrier, and alkaline substances and metal oxides as active components. COS and CS in gases 2 Simultaneous removal; the above-mentioned patent proposes a feasible idea by means of absorption and refining, but the adsorbent with activated carbon as the carrier has the problems of low adsorption capacity and difficult regeneration after adsorption saturation, and the CO 2 、H 2 S and other impurities adsorption removal effect is limited

The patent application publication number CN103816864A discloses an adsorbent for removing disulfides in liquid hydrocarbons and a preparation method thereof, but this method adopts multiple high-temperature sintering treatments, which inevitably causes damage to the molecular sieve structure and greatly reduces The performance of the adsorbent

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