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Apparatus and method for preparing high specific surface area active carbon through alkali activation process

A high specific surface area, activated carbon technology, applied in the field of chemical activation, can solve the problems of uneven mixing, low production efficiency, complex structure of stirring device, etc., achieve continuous production, improve product quality and production efficiency

Active Publication Date: 2016-03-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction device belongs to batch reaction equipment, and the production efficiency is not high; the US patent US4082694 is divided into two stages of activation furnace for high specific surface area activated carbon production, fully mixing petroleum coke and activator KOH, in the horizontal activation furnace with stirring paddle, The temperature is 300-500°C, complete the pre-activation process, realize dehydration and carbonization, and transform the mixed material from a plastic body into a well-dispersed thermosetting particle; finally complete the activation process in a 700-1000°C rotary furnace, and the activated product washes off the reaction residue of alkali activated carbon with high specific surface area
In this process, the preactivated product directly enters the rotary kiln for reaction, and the production is continuous, but there are problems such as complex structure of the stirring device and uneven stirring during the production process.

Method used

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  • Apparatus and method for preparing high specific surface area active carbon through alkali activation process
  • Apparatus and method for preparing high specific surface area active carbon through alkali activation process
  • Apparatus and method for preparing high specific surface area active carbon through alkali activation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The pre-activation experiment of raw material carbon and alkali is carried out in the described device. The main technical parameters of the experiment are as follows: the raw materials are petroleum coke and KOH, the particle size of petroleum coke is less than 150 μm, and the mass ratio of alkali coke is 2:1; 20mm, the effective length of the furnace body is 900mm; the opening of the feeding motor is 50%, the rotation speed is 2.7r / min, and the feed volume of the mixture is 10g / min; . 2 . The products with different numbers of balls are labeled as 1#, 2#, 3#, 4# respectively, and the status of the products is shown in Table 1.

[0048] Table 1 The discharge state of the prepared product under different ball quantities

[0049]

Embodiment 2

[0051] The proportion of the total volume of the balls placed in the furnace body is 0.2, the speed of the furnace body is 10r / min, 20r / min, and 30r / min, and the other conditions are the same as in Example 1. The products under different furnace body speeds are respectively labeled 1 #, 2#, 3#, the discharge state is shown in Table 2.

[0052] Table 2 The discharge state of the prepared product under different furnace speeds

[0053]

Embodiment 3

[0055] The proportion of the total volume of the balls placed in the furnace is 0.2, the preactivation heating temperature is 450°C, 500°C, and 550°C respectively, and other conditions are the same as in Example 1. After the cooled material is taken out, it is washed with 1mol / L hydrochloric acid, and then used Washing with deionized water until the pH of the filtrate reaches 6-7, putting the filtered solid product into an oven at 105-110°C and drying it to constant weight to obtain the final product. The low-temperature nitrogen adsorption experiment was carried out on the obtained final product, and the products under different heating temperatures were respectively labeled as 1#, 2#, and 3# to obtain the specific surface area and pore volume of the product as shown in Table 2.

[0056] Table 3 The specific surface area and pore volume of the preactivated product under different heating temperatures

[0057]

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Abstract

The invention provides an apparatus and a method for preparing high specific surface area active carbon through an alkali activation process. A mixture sequentially goes through a charging unit, a reaction unit and a cooling and collecting unit to carry out a low temperature pre-activation reaction, a high temperature activation reaction and cooling to obtain an activated product, and the activated product is subsequently processed to obtain the high specific surface area active carbon. Ball maximally reduce the wall sticking problem in a pre-activation or activation device, and also have a very good heat transfer and material conveying enhance effect. The apparatus and the method have the advantages of elimination of the wall sticking phenomenon, realization of continuous production of the high specific surface area active carbon, improvement of the quality and the production efficiency of the high specific surface area active carbon, reduction of the production cost of the high specific surface area active carbon, and reduction of environmental pollution.

Description

technical field [0001] The invention belongs to the field of chemical activation methods, and relates to a device and method for preparing activated carbon with high specific surface area by using carbon-containing raw materials through alkali activation method. Background technique [0002] Activated carbon with high specific surface area has been widely used in the fields of gas storage, gas separation, catalytic reaction and supercapacitor due to its rich microporous structure and super large adsorption capacity. In recent years, the demand for activated carbons with high specific surface area has also increased. The ways to prepare activated carbon mainly include physical activation and chemical activation. The method mainly involved in the invention is to use an alkaline activator to treat carbonaceous raw materials to prepare activated carbon with high specific surface area. [0003] In the industrial production process, during the heating reaction process of the mix...

Claims

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Application Information

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IPC IPC(8): C01B31/12
CPCC01P2006/12C01P2006/14
Inventor 徐绍平王克超王会涛
Owner DALIAN UNIV OF TECH
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