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Method for preparing spherical active carbon employing water soluble bitumen

A spherical activated carbon, water-soluble technology, used in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of difficult to clean experimental equipment, difficult to control sphericity, and wide particle size distribution of asphalt spheres. Oxidation non-melting step, easy industrial production, controllable particle size distribution effect

Inactive Publication Date: 2014-04-02
TIANJIN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although the suspension method can obtain asphalt balls with a controllable particle size distribution, the preparation process requires the preparation, crushing and sieving of the asphalt; although the emulsification method has a simple process and low requirements for process equipment, it needs to consume a certain amount of Organic solvents and the obtained asphalt balls have a wide particle size distribution; the cost of the asphalt balls obtained by the disc granulation method is low, but the obtained asphalt balls have a wide particle size distribution, showing roughness, difficult to control the sphericity, and the raw material powder is easy to diffuse into the air Cause environmental pollution; the spray granulation method can effectively control the particle size distribution by adjusting the concentration of the asphalt solution, spray flow rate and drying temperature and other process conditions, but the asphalt balls prepared by the spray method often need to put the molten asphalt under the protection of an inert atmosphere Spray granulation is performed, which makes the method consume a lot of energy and the experimental equipment is difficult to clean

Method used

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  • Method for preparing spherical active carbon employing water soluble bitumen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. The water solubility of 100g is greater than 70%, the pH value is about 8-9, and the density is 0.98g / cm 3 The commercial sulfonated asphalt was placed in 2L of deionized water and stirred for 1 hour at a speed of 600r / min. Centrifuge after it is fully dissolved, collect the soluble part of the upper layer and dry it in an oven at 90°C for 60 hours to obtain 50g of water-soluble sulfonated pitch;

[0014] 2. At room temperature and at a stirring rate of 100 r / min, add 5 g of the water-soluble sulfonated pitch obtained in step 1 to 495 g of deionized water, stir at constant temperature for 1 hour and set aside;

[0015] 3. Put 500g of the sulfonated asphalt aqueous solution in step 2 under the condition that the feed temperature is 50°C, the outlet temperature is 40°C, and the injection flow rate is 800L / h, the nozzle diameter is 0.75mm, the working pressure is 0.2MPa, and the fan A pressure spray granulator (Shanghai Shunyi Experimental Equipment Co., Ltd., model: S...

Embodiment 2

[0018] 1. Prepare the dried water-soluble sulfonated pitch according to the method described in Example 1 step 1;

[0019] 2. At room temperature and a stirring rate of 150r / min, add 10g of the above-mentioned dried sulfonated pitch to 190g of deionized water, stir at constant temperature for 1 hour and set aside;

[0020] 3. Put 200g of sulfonated asphalt aqueous solution in step 2 under the conditions of feed temperature of 70°C, outlet temperature of 51°C, injection flow rate of 500L / h, using nozzle diameter of 0.75mm, working pressure of 2bar, fan frequency A 50Hz experimental pressure spray granulator (Shanghai Shunyi Experimental Equipment Co., Ltd., model: SP-1500) was used for spray granulation, and 9.8g of asphalt balls with a particle size distribution of 0.5-5.7 μm were obtained;

[0021] 4. The asphalt ball obtained in step 3 is firstly heated to 600°C at a heating rate of 1.5°C / min for carbonization for 1 hour, and then heated to 800°C at a heating rate of 1.5...

Embodiment 3

[0023] 1. Prepare the dried water-soluble sulfonated pitch according to the method described in Example 1 step 1;

[0024] 2. At room temperature and at a stirring rate of 120r / min, add 30g of the above-mentioned dried sulfonated pitch to 270g of deionized water, stir at constant temperature for 1 hour and set aside;

[0025] 3. Use 300g of sulfonated asphalt aqueous solution in step 2 under the conditions of feed temperature of 90°C, outlet temperature of 62°C, injection flow rate of 400L / h, using nozzle diameter of 0.75mm, working pressure of 3bar, fan frequency A 50Hz experimental pressure spray granulator (Shanghai Shunyi Experimental Equipment Co., Ltd., model: SP-1500) was used for spray granulation to obtain 28g of asphalt balls with a particle size distribution of 1.2-5.0 μm;

[0026] 4. The asphalt balls obtained in step 3 are firstly heated to 700°C at a heating rate of 2°C / min for carbonization for 1.5 hours, and then activated at a heating rate of 1°C / min t...

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Abstract

The invention discloses a method for preparing spherical active carbon employing water soluble bitumen. The method comprises the following processes: washing commercial sulfonated asphalt to obtain a complete water-soluble material; preparing a bituminous solution from the obtained water-soluble material or water-soluble mesophase pitch and deionized water; carrying out spray granulation on the bituminous solution, so as to obtain a bituminous ball; carbonizing and activating the bituminous ball, so as to obtain the spherical active carbon. The method has the advantages that the commercial sulfonated asphalt and the water-soluble mesophase pitch are adopted, so that the spherical active carbon is low in price and wide in source, no organic solvent is added in the balling process, the bituminous ball is controllable in particle size distribution, the prepared spherical active carbon is large in specific surface area, and industrial production is easy to achieve.

Description

technical field [0001] The invention belongs to a preparation method of spherical activated carbon. In particular, it relates to a method for preparing spherical activated carbon by using water-soluble pitch as a raw material. Background technique [0002] Pitch balls are the precursors for the preparation of pitch-based spherical activated carbon, and their quality, size and morphology have a very important impact on the performance and application of the final pitch-based spherical activated carbon. As one of the key processes for preparing pitch-based spherical activated carbon, the selection of pitch spheroidization method is particularly important. At present, the methods of asphalt spheroidization mainly include suspension method, emulsification method, disc granulation method and spray granulation method. Although the suspension method can obtain asphalt balls with a controllable particle size distribution, the preparation process requires the preparation, crushing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08C01B32/33
Inventor 王成扬陈明鸣于宝军杨斌
Owner TIANJIN UNIV
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