A kind of adsorbent for removing chlorinated pollutants and its preparation method and application

Abstract

The invention relates to an adsorbent for removing chloride pollutants, and a preparation method and an application thereof. The adsorbent is prepared with a ZSM-5 molecular sieve and an X-type molecular sieve as carriers for supporting an active component through a microwave irradiation solid-phase reaction. The produced material is mixed and shaped with a binder and a pore forming agent to formgranules; in air atmosphere in certain humidity, the granules are treated at certain temperature to prepare the adsorbent for removing chloride pollutants, which can be used for removing various chloride pollutants. Compared with the prior art, the preparation method is quick and controllable and is environment-friendly and pollution-free. The adsorbent has abundant pore structures and has highly-dispersed active components.

Description

technical field [0001] The invention relates to an adsorbent, in particular to an adsorbent for removing chlorinated pollutants and its preparation method and application. Background technique [0002] In recent years, people have paid more and more attention to the harm of persistent chlorinated pollutants such as organic chlorides and hydrogen chloride to industrial production, and it is imperative to develop effective purification methods. In the field of petroleum refining, limited by the mining and refining process, the content of organic chlorinated pollutants such as chlorinated alkanes in naphtha has increased significantly. In the subsequent pre-hydrogenation process, organic chlorides will be converted into hydrogen chloride. The presence of pollutants will lead to corrosion of equipment and pipelines, poisoning or deactivation of catalysts, and double risks of safety and operation for production enterprises. In the continuous reforming unit, the chlorine lost by ...

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Problems solved by technology

[0003] CN1064099A discloses a chloride with an alkali metal compound or an alkaline earth metal compound as an active component and a natural inorganic clay as a binder, but the pore structure distribution of the adsorbent is poor, and the chlorine purification degree is low

US5595954 discloses a method for preparing a dechlorination agent using alumina promoted by an alkali or alkaline earth metal salt solution. The active component is introduced by impregnation or solution mixing, but there is Al 2 o 3 The carrier is unstable in acidic environment, and the penetration chlorine capacity is low in actual working conditions

CN104437342B discloses a dechlorination agent obtained by impregnating soluble copper salts, calcium salts, magnesium salts, barium salts, etc. on cylindrical carbon molecular sieves after drying and stabilization treatment, suitable for the removal of inorganic chlorine in oil products , but the interaction between the carbonaceous carrier (such as activated carbon, etc.) and the active metal component is weak, and the metal active component is easy to lose, especially in the liquid phase reaction condition, the loss is more serious

[0004] The dechlorination agents currently on the market are usually developed for a single chlorine species, and most of them use a single type of carrier, which has defects such as poor pore structure distribution, weak acid resistance, small specific surface area, low content of active components, and narrow application range.

In the preparation process, the addition of active components generally adopts the method of impregnation or direct mixing of solids. In the impregnation method, the distribution of active components is relatively uniform, but there is wastewater pollution, and the surface area and pore volume of the adsorbent are significantly reduced, while solid mixing In this method, the distribution of active components is not uniform, and the utilization efficiency of the pores of the carrier material is low, which affects the adsorption effect

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