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Method for preparing powdered activated carbon by using longan seeds

A technology of powdered activated carbon and longan core, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., to achieve the effect of protecting resources, reducing environmental pollution, and reducing production costs

Inactive Publication Date: 2012-07-18
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, longan is mainly based on directly eating its pulp, and its 14% to 22% shell (annual output of 450,000 to 700,000 tons in my country) and 17% to 23% fruit stone (annual output of 550,000 to 750,000 tons in my country) ) has not been effectively used

Method used

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  • Method for preparing powdered activated carbon by using longan seeds
  • Method for preparing powdered activated carbon by using longan seeds
  • Method for preparing powdered activated carbon by using longan seeds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present invention is achieved like this, comprises the following steps:

[0022] A) using the commercially available fresh longan to remove the pulp and shell obtained from the core as raw material, air-dried or dried naturally, and crushed to particles with a particle diameter of 0.1mm;

[0023] B) stirring and impregnating for 3 hours according to the mass ratio of longan core and 30% phosphoric acid in mass fraction of 1:0.5;

[0024] C) Move the impregnated longan core to a tubular heating furnace, and under the protection of nitrogen, heat at a heating rate of 10°C / min to carbonize and activate within the range of 300°C for 2 hours, and then cool naturally;

[0025] D) Rinse the cooled object with hot water until the filtrate is neutral and dry to obtain the finished activated carbon product.

Embodiment 2

[0027] The present invention is achieved like this, comprises the following steps:

[0028] A) using the commercially available fresh longan to remove the pulp and the fruit core obtained from the shell as raw material, air-dried or dried naturally, and crushed to particles with a particle diameter of 1 mm;

[0029] B) stirring and impregnating for 6 hours according to the mass ratio of longan core and mass fraction of 85% phosphoric acid as 1:1.5;

[0030] C) Move the impregnated longan core to a tubular heating furnace, under the protection of nitrogen, heat at a heating rate of 10°C / min to carbonize and activate within the range of 900°C for 6 hours, and then cool naturally;

[0031] D) Rinse the cooled object with hot water until the filtrate is neutral and dry to obtain the finished activated carbon product.

Embodiment 3

[0033] The present invention is achieved like this, comprises the following steps:

[0034] A) using the commercially available fresh longan to remove the pulp and the fruit core obtained from the shell as raw material, air-dried or dried naturally, and crushed to particles with a particle diameter of 0.5mm;

[0035] B) stirring and impregnating for 5 hours according to the mass ratio of longan core and 50% phosphoric acid in mass fraction of 1:1;

[0036] C) Move the impregnated longan core to a tubular heating furnace, and under the protection of nitrogen, heat at a heating rate of 10°C / min to carbonize and activate within the range of 700°C for 4 hours, and then cool naturally;

[0037] D) Rinse the cooled object with hot water until the filtrate is neutral and dry to obtain the finished activated carbon product.

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Abstract

Disclosed is a method for preparing powdered activated carbon by using longan seeds, wherein the longan seeds serve as a raw material, a certain activating agent is used, and then the activated carbon with developed abundant micro-pores can be prepared. The method comprises the steps of drying with air the longan seeds, smashing the longan seeds, adding certain activating agent for dipping, leaching, and carbonization-activation, and obtaining the finished product of activated carbon through withdrawing, rinsing, drying and so on. The activated carbon has homogenous texture and developed micro-pores, wherein the specific surface area (SBET) of the activated carbon is 1,912m2 g-1, the specific surface area of the micro-pores is 1,863m2 g-1, the total pore capacity (P / P0=0.95) is 1.00cm3 g-1, micro-pore volume is 0.87 cm3 g-1, the productivity is 36%, the ash content is 0.24%, iodine value is 1,368mg / g, and the methylene blue adsorptive value is 17.1ml / 0.1g. The longan seeds are crop waste which is not used effectively and the source of the longan seeds is wide. If the environment-friendly activated carbon uses the longan seeds effectively, not only the problem of environmental pollution caused by burning of the longan seeds or discarding of the longan seeds is resolved, but also production cost of the activated carbon is reduced greatly and industrial production of the activated carbon can be achieved..

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing powdered activated carbon with longan seeds. Background technique [0002] Activated carbon (AC for short) is a porous carbon material with developed pore structure and large specific surface area prepared from biological organic matter. As an adsorbent and catalyst carrier with excellent performance, activated carbon material has the advantages of stable chemical properties, high mechanical strength, acid resistance, alkali resistance, heat resistance, insoluble in water and organic solvents, and can be easily recycled. It is widely used in food processing. , metallurgy, medicine, chemical industry, national defense, environmental protection and energy and other fields. With the development of society, the demand for activated carbon is also increasing year by year. The physical and chemical properties of activated carbon are closely related to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08C01B32/324C01B32/342
Inventor 温祖标章荣立邓志红陈德锴钟声亮
Owner JIANGXI NORMAL UNIV