Dechlorination agent and preparation method thereof

Abstract

The invention discloses a dechlorination agent and a preparation method thereof. The dechlorination agent is prepared from the following materials: 15-70wt% of carrier, 15-60wt% of active components, 1-10wt% of a pore-forming agent, 1-5wt% of an extrusion aid and 2-10wt% of a binder, wherein the carrier is at least one of weak acid salt, kaolin, pseudo-boehmite or Al2O3. The preparation method comprises the steps of mixing the materials, adding water, mixing, kneading, extruding, drying and calcining. The dechlorination agent has the advantages of high adsorption efficiency against high-concentration or low-concentration HCl at normal temperature, high dechlorination precision, high chlorine content of above 30% and a certain adsorption effect against organic chlorides; chemical reaction adsorption is adopted for adsorption against HCl, the adsorption is performed at normal temperature and normal pressure, energy consumption is not required, and the absorbed HCl and the active component in the dechlorination agent perform reaction to form a stable chemical substance to exist in an adsorber bed layer; and the dechlorination agent further has the advantages of low toxicity, high stability, easiness in filling and unloading, and no secondary pollution.

Description

technical field [0001] The invention relates to a dechlorination agent and a preparation method thereof. Background technique [0002] The harm of chlorine in industrial production and life is mainly in the form of HCl. In some industrial production, organic chlorides will also be converted into HCl, which will affect the production equipment and human society. HCl is a highly reactive and highly corrosive harmful gas. Its industrial hazards are mainly manifested in the following aspects: (1) Corrosion equipment; chlorine is the main factor causing equipment corrosion. , mainly in atmospheric and vacuum distillation units, naphtha hydrogenation units, catalytic cracking units and catalytic reforming units. The common ones are dew point corrosion and stress corrosion. HCl is non-corrosive in gaseous state, or corrosion is very light, but after liquid water appears in the condensation area, it will form highly corrosive hydrochloric acid, which will dissolve and corrode the ...

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Problems solved by technology

(2) Catalyst poisoning; chlorine has unbonded lone pairs of electrons and has a great electron affinity, which is easy to react with metal ions, occupying or destroying the active sites of catalysts, such as platinum catalysts used in catalytic reforming devices and other expensive catalyst

Moreover, chloride ions also have high mobility and often migrate downstream with the process gas, which can deactivate the entire catalyst in a short period of time and bring great economic losses to the enterprise.

(3) Equipment blockage; under the condition of hydrogen, the chloride in the raw material will be converted into HCl, and HCl will react with NH3 to form ammonium chloride. Under low temperature environment, ammonium chloride crystallizes and deposits on the inlet of the heat exchanger and other related equipment, causing Blockage affects the normal operation of the device and reduces the service life of the equipment; moreover, chlorine reacts with the zinc oxide desulfurization catalyst to form zinc chloride with a low melting point (285°C), which causes the desulfurizer to sinter and coke, and blocks the passage of hydrogen sulfide into the desulfurizer , so that the desulfurization efficiency is reduced

However, most of the above-mentioned dechlorination agents are high-temperature type (100-450°C), while normal temperature types such as T401 series, NC, KT407 and G-92 dechlorination agents and low-temperature type (0°C) are relatively less researched. less, and there are problems such as low chlorine capacity at normal temperature and pressure, low strength, and the gas path that cannot handle higher concentrations of HCl; in addition, the diameter of most normal temperature dechlorination agents on the market is generally 3-5mm, and they are all bar-shaped Or spherical (such as G-92, KT407, NC, etc.), but the strength of most products is only about 30-100N / cm, although this is higher than the standard of the Ministry of Chemical Industry (50N / cm), but in some special occasions such as It is not suitable for use if it contains water vapor or is too heavy, because it will be muddy or crushed and blocked, causing production stoppage