Preparation method of supported ferric activated carbons as well as condition and device applying supported ferric activated carbons to absorb methylbenzene

A technology of iron-loaded activated carbon and activated carbon, which is applied in the direction of separation methods, chemical instruments and methods, and other chemical processes, can solve the problem of small adsorption capacity of activated carbon, and achieve the effect of improving adsorption capacity

Inactive Publication Date: 2015-08-05
NANTONG VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At normal temperature, the saturated adsorption capacity of activated carbon can meet the general adsorption requirements, but the adsorption capacity of activated carbon is very small at high temperature.

Method used

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  • Preparation method of supported ferric activated carbons as well as condition and device applying supported ferric activated carbons to absorb methylbenzene
  • Preparation method of supported ferric activated carbons as well as condition and device applying supported ferric activated carbons to absorb methylbenzene

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preparation example Construction

[0041] A preparation method for iron-loaded activated carbon, comprising the steps of:

[0042] (1) Preparation of impregnation solution: dissolve the weighed iron salt in 0.1-10mol / L acid solution, and prepare the impregnation solution at a temperature of 20-80°C;

[0043] Wherein, the iron salt is one or more mixtures of ferric chloride, ferric nitrate, ferric sulfate, ferric acetate and ferric oxalate, preferably ferric chloride.

[0044] The acid solution is preferably 1mol / L hydrochloric acid solution.

[0045] (2) Impregnation of activated carbon: using the equal volume impregnation method or excessive impregnation method, impregnate activated carbon with a particle size of 150 μm to 1700 μm in the above impregnation solution, and the mass ratio of iron element to activated carbon after impregnation is 0.025 to 0.35;

[0046] Among them, the activated carbon can be selected from one or a combination of wood, coal, fruit shell and coconut shell granular activated carbon....

Embodiment 1

[0066] Embodiment one: take 20~40 purpose coconut shell activated carbons as example (unloaded activated carbon is denoted as AC 0 ), dissolving ferric chloride in a certain volume of 1mol / L HCl solution, and then AC 0 dipped in it. The mass ratios of iron and activated carbon in the impregnation system were 0.028:1, 0.056:1, 0.084:1, 0.112:1, 0.224:1, and 0.336:1, respectively. denoted as AC 1 、AC 2 、AC 3 、AC 4 、AC 5 and AC 6 .

[0067] AC 0 、AC 1 、AC 2 、AC 3 、AC 4 、AC 5 and AC 6 The adsorption experiments of toluene were carried out, and the adsorption conditions were as follows: the toluene content in the toluene gas source was 5%, the adsorption pressure was 0.2MPa, and the gas flow rate was 250mL / min.

[0068] Under the same adsorption conditions and different loads, the adsorption capacity of iron-loaded activated carbon to toluene is shown in Table 1 and figure 2 shown.

[0069] Table 1: Adsorption characteristics of adsorbents with different loadings ...

Embodiment 2

[0072] Example 2: Dissolve ferric chloride in a certain volume of 1mol / L HCl solution, and then impregnate activated carbon AC in it. The mass ratio of iron to activated carbon in the impregnation system is 0.05:1. Drying in medium temperature, and then the adsorption experiment of toluene was carried out.

[0073] The toluene content in the toluene gas source is 3%, the adsorption pressure is 0.8MPa, the gas flow rate is 250mL / min, the adsorption temperature is 80°C, and the saturated adsorption capacity of toluene reaches 190.4mg / g activated carbon, which is higher than that of unmodified activated carbon under the same conditions. The amount of activated carbon was 131.54 mg / g, an increase of 44.75%.

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Abstract

The invention discloses a preparation method of supported ferric activated carbons as well as a condition and a device applying the supported ferric activated carbons to absorb methylbenzene. The preparation method comprises the following steps: (1) preparing impregnation liquid: dissolving the weighed ferric salt into 0.1-10mol/L of acid solution, and preparing a mixed solution into the maceration extract at 20-80 DEG C; (2) impregnating active carbons: dipping the active carbons of which the granularity is 150-1700 [mu]m into the above impregnation liquid by adopting either an equivalent-volume impregnation method or an excessive impregnation method, wherein the mass ratio of the impregnated ferric elements and the active carbons is 0.025-0.35; (3) impregnating: placing the solution impregnated with the active carbons for 3-15 hours at room temperature; (4) drying: placing the impregnated active carbons into nitrogen at 150 DEG C to dry for 4-8 h, so as to obtain the supported ferric activated carbon. According to the preparation method of the supported ferric activated carbons provided by the invention, the metal element iron is impregnated to the active carbons to prepare the supported ferric activated carbons, therefore the absorption capacity of the active carbons can be improved, and the saturated adsorbing capacity of methylbenzene can be improved by 30-100%.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials and air pollution treatment, and in particular relates to a preparation method of iron-loaded activated carbon and a condition and a device for using it to adsorb toluene. Background technique [0002] With the rapid development of modern industry, dichloromethane, toluene, xylene, benzene and other aromatics, halogenated hydrocarbons, aldehydes, ketones, esters, alcohols and other organic solvents are widely used in chemical industry, petrochemical industry, coating, medicine, etc. , rubber, resin, printing and other fields. Most of these volatile organic solvents are toxic, and a considerable part of them are finally discharged into the atmosphere in the form of organic waste gas, causing serious air pollution. If it is not handled properly, it will cause the loss of raw materials, pollute the environment, and more seriously damage human health. The country's increasing emphasis o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
Inventor 黄艳芳刘志军李铁军刘金红
Owner NANTONG VOCATIONAL COLLEGE
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