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

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...

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