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Continuous alkali activation device and method for preparing activated carbon with high specific surface area

A high specific surface area, activated carbon technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of low unit capacity, potential safety hazards, and high energy consumption, to eliminate potential safety hazards, reduce production costs, The effect of reducing alkali consumption

Active Publication Date: 2013-05-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The above-mentioned high specific surface area activated carbon production methods are batch-type, and there are the following main problems: the mass ratio of raw material alkali to carbon (hereinafter referred to as the alkali-carbon ratio) is high, usually greater than 3:1; pollution is large; production efficiency and unit equipment capacity are low ; High energy consumption; Due to the accumulation of elemental potassium K in the reaction system, there are potential safety hazards

Method used

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  • Continuous alkali activation device and method for preparing activated carbon with high specific surface area
  • Continuous alkali activation device and method for preparing activated carbon with high specific surface area
  • Continuous alkali activation device and method for preparing activated carbon with high specific surface area

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Experimental program
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Effect test

Embodiment 1

[0033] The KOH activation experiment of raw carbon is carried out in the experimental device, and the operation process principle of the experimental device is attached figure 1 ~ attached Figure 4 , where the pre-activation reactor and the vertical activation furnace are independently controlled separately. The main technical parameters of the experimental device are as follows: the pre-activation furnace is a single-screw extrusion type, in which the screw extrusion chamber is 400mm long, and the heating section is 150mm long; the vertical activation furnace is made of high-temperature and corrosion-resistant stainless steel, with an effective height of 1206mm and an inner diameter of 120mm. The number of sheets is 45 layers, and the fan-shaped central angle α formed by the blanking holes of the sheets is 120 o , the total opening rate is 25%, and the position stagger angle β of the fan-shaped arrangement of the two adjacent material plates is 180 o ; The activation furn...

Embodiment 2

[0041] The main technical parameters of the experimental device The fan-shaped central angle α formed by the blanking hole of the material plate is 60 o , the total opening rate is 12%, and other parameters are the same as in Example 1. Under this condition, when the rotating speed of the central shaft is 0.57r / min, the total residence time of the pre-activated alkali-carbon mixture in the furnace is 86min, and it stays in the heating section. The time is 32min, the residence time in the constant temperature section is 34min, and the residence time in the cooling section is 20min.

[0042] Using anthracite as raw material, the particle size is less than 250μm, the mass ratio of anthracite / KOH is 3:1; the temperature of the preactivation heating section is 400°C, and the residence time of the material passing through the heating section of the preactivation reactor is about 10min; the temperature distribution of the heating section of the activation furnace The temperature in t...

Embodiment 3

[0046] The main technical parameters of the experimental device The fan-shaped central angle α formed by the blanking hole of the material plate is 30 o , the total opening rate is 5%, and other parameters are the same as in Example 1. Under this condition, when the rotating speed of the central shaft is 0.57r / min, the total residence time of the preactivated alkali-carbon mixture in the furnace is 95min, and it stays in the heating section. The time is 35min, the residence time in the constant temperature section is 38min, and the residence time in the cooling section is 22min.

[0047] Equally with anthracite raw material, other conditions are with embodiment two. The specific surface area and pore volume of different batches of activated carbon products are shown in Table 4.

[0048] Table 4 Specific surface area and pore volume of different batches of activated carbon products

[0049] Sample No.

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Abstract

The invention provides a continuous alkali activation device and method for preparing activated carbon with high specific surface area. The method includes the following steps: enabling uniformly-mixed alkali-carbon mixture to be subjected to pre-activating, activating and potassium elementary substance conversion treatment through a pre-activating reactor, a continuous activating oven and an activating product collector respectively, so as to obtain the activating product; and enabling the activating product to be subjected to acid-washing, washing and drying to obtain a final activated carbon product. Inside a continuous vertical activating oven, the alkali-carbon mixture and a carrier gas continuously flow and are contacted in the reverse direction, pass by a warming section, a constant temperature section and a cooling section, so that generated elementary substance potassium during the activated process furthest circulates inside the activating oven, the intercalation function of potassium on graphite microcrystal in carbon is enhanced, carbon activation is facilitated, the activating effect and utilizing efficiency of alkali are improved, the product quality and production efficiency of activated carbon are improved, alkali consumption and production cost are reduced, and environmental pollution is reduced; and meanwhile, the activating product collector is further arranged inside the continuous activating device for safe conversion of K elementary substance, and the prevention of potential safety hazard brought by residual K in the activated product is eliminated.

Description

technical field [0001] The invention relates to a device and method for preparing activated carbon with high specific surface area from petroleum coke, pitch coke, anthracite and other raw material carbons through continuous alkali activation. Background technique [0002] Activated carbon with high specific surface area has great application potential in fuel gas storage, gas separation, catalytic reaction, supercapacitor, etc. due to its well-developed microporous structure and large adsorption capacity. At present, one of the main routes to prepare activated carbon with high specific surface area is to prepare activated carbon by chemical activation method from raw materials such as petroleum coke, pitch coke, anthracite, etc., using alkali, namely KOH, as the activator. Chinese patent ZL200610086149.1 put the mixed alkali, that is, the mixture of KOH or NaOH and carbon in a vacuum reactor, heat up and activate in a vacuum environment (-0.03MPa~-0.09 MPa), and finally was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C01B32/348C01B32/39
Inventor 徐绍平肖荣林李庆学欧阳少波张如君全翠
Owner DALIAN UNIV OF TECH
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