Preparation method of chromium-loaded active carbon as well as condition and device of methylbenzene adsorption using chromium-loaded active carbon

A technology of activated carbon adsorption and activated carbon, which is applied in the field of preparation of chromium-loaded activated carbon, can solve the problem of small adsorption capacity of activated carbon, and achieve the effect of improving adsorption capacity

Inactive Publication Date: 2015-07-08
NANTONG VOCATIONAL COLLEGE +1
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  • Description
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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 chromium-loaded active carbon as well as condition and device of methylbenzene adsorption using chromium-loaded active carbon
  • Preparation method of chromium-loaded active carbon as well as condition and device of methylbenzene adsorption using chromium-loaded active carbon
  • Preparation method of chromium-loaded active carbon as well as condition and device of methylbenzene adsorption using chromium-loaded active carbon

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preparation example Construction

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

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

[0043] Wherein, the chromium salt is chromium chloride, and the acid solution is preferably 1 mol / L hydrochloric acid solution.

[0044] (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 chromium to activated carbon after impregnation is 0.03 to 0.3;

[0045] Among them, the activated carbon can be selected from one or more mixtures of wood, coal, fruit shell and coconut shell granular activated carbon. The optimal mass ratio of chromium to activated carbon after impregnation is 0.1.

[0046] (3) Impregnation: Plac...

Embodiment 1

[0065] Embodiment one: take 20~40 purpose coconut shell activated carbons as example (unloaded activated carbon is denoted as AC 0 ), dissolving chromium chloride in a certain volume of 1mol / L HCl solution, and then AC 0 dipped in it. After standing at room temperature for 12 hours, it was dried in nitrogen at 150°C. The mass ratios of chromium and activated carbon in the impregnation system were 0.052:1, 0.104:1, 0.156:1, and 0.208:1, respectively, and the obtained activated carbon adsorbents were denoted as AC 1 、AC 2 、AC 3 and AC 4 .

[0066] AC 0 、AC 1 、AC 2 、AC 3 and AC 4 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.

[0067] Under the same adsorption conditions and different loads, the adsorption capacity of chromium-loaded activated carbon to toluene is shown in Table 1 and fi...

Embodiment 2

[0071] Example 2: Dissolve chromium chloride in a certain volume of 1mol / L HCl solution, and then impregnate activated carbon AC in it. The mass ratio of chromium to activated carbon in the impregnation system is 0.07:1. After drying in nitrogen, the adsorption experiment of toluene was carried out.

[0072] The toluene content in the toluene gas source is 3%, the adsorption pressure is 0.2MPa, the gas flow rate is 250mL / min, the adsorption temperature is 40°C, and the saturated adsorption capacity of toluene reaches 192.46mg / g activated carbon, which is higher than that of unmodified activated carbon under the same conditions. The amount of activated carbon was 155.91 mg / g, an increase of 23.44%.

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Abstract

The invention discloses a preparation method of chromium-loaded active carbon as well as the condition and device of methylbenzene adsorption using the chromium-loaded active carbon. The preparation comprises the following steps: (1) preparing impregnating liquid, namely dissolving weighed chromium salt into acid solution of 0.1-10mol/L and preparing the impregnating liquid at the temperature of 20-80 DEG C; (2) impregnating the active carbon, namely by using an isovolumetric impregnating method or excessive impregnating method, impregnating the active carbon with the particle size being 150 microns-1700 microns in the prepared impregnating solution, wherein the mass ratio of the chromium to the active carbon is 0.03 to 0.3 after impregnating; (3) impregnating, namely placing the solution after the active carbon is impregnated at room temperature for 3-15 hours; and (4) drying, namely placing the impregnated active carbon in nitrogen of 150 DEG C for 4-8 hours, so as to obtain the chromium-loaded active carbon. According to the preparation method, the metal chromium element is impregnated on the active carbon to prepare the chromium-loaded active carbon; the adsorption capability of the active carbon is improved and the saturated adsorption of the active carbon to methylbenzene can be increased by 20-110%.

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 chromium-loaded activated carbon, 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/32B01D53/02
Inventor 黄艳芳刘志军刘金红丁彩峰朱小刚刘芳
Owner NANTONG VOCATIONAL COLLEGE
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