Microwave radiation method for preparing active carbon from biomass

A microwave radiation and biomass technology, applied in the field of material chemical industry, can solve the problems of unexplained recycling of zinc chloride raw materials, chlorine gas corrosive environment to metal materials, difficulty in mass production and automation, etc.

Inactive Publication Date: 2006-12-13
DALIAN UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

However, there are also disadvantages, such as the corrosion of metal materials and environmental pollution caused by chlorine gas produced in the production process, the manufacturing process of production equipment is complicated, and it is difficult to mass produce and automate.
However, the above-mentioned manufacturing processes are all at the laboratory level, and the equipment used is a modified household microwave oven. The production scale is small and cannot be produced continuously. The patent applicant has not explained how to recycle the zinc chloride raw material

Method used

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  • Microwave radiation method for preparing active carbon from biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Pine sawdust was mixed with 40% zinc chloride solution and impregnated for 25 hours (the mass ratio of zinc chloride to pine sawdust was 0.75:1), and packed into the microwave reaction equipment as shown in the accompanying drawing. Set the power to 1500W, and irradiate at 600-700°C for 18min. Wash with 20% hydrochloric acid for 1 hour, and wash with water until the pH value is 7. Zinc chloride was recovered in this process with a recovery rate of 56.9%. After the material was washed with water, it was filtered and dried in a microwave oven for 5 min. Grinding to 200 meshes to obtain an activated carbon product with a yield of 37.0%. Its specific surface area is 1084m 2 / g, iodine adsorption value 1189.3mg / g, methylene blue decolorization power 135.8ml / g, benzene static adsorption capacity 47.0%. The recovery rate of zinc chloride in the spray tower is 14.5%, and the total recovery rate is 70.8%.

Embodiment 2

[0025] The pine sawdust is mixed with 50% zinc chloride solution and soaked for 15 hours (the mass ratio of zinc chloride and pine sawdust is 1:1), and packed into the microwave reaction equipment shown in Figure 1. Set the power to 10000W, and irradiate at 700-800°C for 10min. Wash with 20% hydrochloric acid for 1.5 hours, and wash with water until the pH value is 7. Zinc chloride was recovered in this process with a recovery rate of 56.3%. After the material was washed with water, it was filtered and dried in a microwave oven for 3 minutes. Grinding to 200 meshes to obtain an activated carbon product with a yield of 38.7%. Its specific surface area is 1159m 2 / g, iodine adsorption value 1191.6mg / g, methylene blue decolorization power 165.7ml / g, benzene static adsorption capacity 51.3%. The recovery rate of zinc chloride in the spray tower is 14.7%, and the total recovery rate is 71.0%.

Embodiment 3

[0027] The rice husk was mixed with 50% zinc chloride solution and soaked for 20 hours (the mass ratio of zinc chloride and rice husk was 1.5:1), and packed into the microwave reaction equipment shown in Figure 1. Set the power to 3000W, and irradiate at 600-700°C for 15min. Wash with 20% hydrochloric acid for 2 hours, and wash with water until the pH value is 7. Zinc chloride was recovered in this process with a recovery rate of 57.8%. After the material was washed with water, it was filtered and placed in a microwave oven for 7 minutes to dry. Grinding to 200 meshes to obtain an activated carbon product with a yield of 37.9%. Its specific surface area is 1397m 2 / g, iodine adsorption value 1242.5mg / g, methylene blue decolorization power 198.7ml / g, benzene static adsorption capacity 73.1%. The recovery rate of zinc chloride in the spray tower is 14.6%, and the total recovery rate is 72.4%.

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Abstract

The invention relates the preparing method of activated carbon with maser radiation biology. The method comprises the following steps: disintegrating biomass, mixing it with zinc chloride solution, heating in maser radiation device, acid cleaning, water scrubbing, microwave drying, disintegrating and getting activated carbon product. The invention has the advantages of uniformly heating, high speed, saving time and saving energy. The iodine sorption value and methylene blue sorption value are over the national high quality standard. The zinc chloride can be reclaimed, and recovery ratio is over 70%.

Description

technical field [0001] The invention belongs to the technical field of material chemical industry and relates to a method for producing activated carbon, in particular to a method for producing activated carbon from microwave irradiated biomass. Background technique [0002] Activated carbon is a high-quality adsorbent with chemical stability, acid and alkali resistance, and high temperature resistance. It is widely used in gas separation, solvent recovery, drinking water purification, environmental protection, food industry and other fields. [0003] At present, the raw materials for producing activated carbon mainly include wood, coal and other carbon-containing raw materials, among which woody raw materials are the best. Woody raw materials are mainly various types of husks and timber, but the source of husks is limited, and the wood will be at the cost of felling trees. With the development of the economy and the prominence of environmental pollution, the demand for act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08
Inventor 王同华檀素霞潘艳秋邱介山
Owner DALIAN UNIV OF TECH
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