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Preparation method of coffee grounds activated carbon

A technology for activated carbon and coffee grounds, which is applied in the field of preparing activated carbon by using coffee grounds, can solve problems such as waste of resources and energy, and achieve the effects of reducing losses, increasing porosity, and inhibiting the generation of tar.

Inactive Publication Date: 2019-08-20
咖法科技(上海)有限公司
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  • Summary
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Problems solved by technology

The common method of disposing of coffee grounds is burning and landfilling, resulting in a waste of resources and energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of coffee ground activated carbon includes the following steps:

[0027] S1. Pretreatment, washing the coffee grounds in distilled water to remove ash and impurities on the surface of the coffee grounds, and placing the washed coffee grounds in a drying box for drying. The drying temperature of the coffee grounds is 70-80°C, the drying time is 10-12 hours, and the moisture content of the coffee grounds after drying is 35-40%. The selected coffee grounds have a particle size of 80-100 mesh.

[0028] S2, pyrolysis and carbonization, placing the dried coffee grounds in a vacuum reactor for pyrolysis and carbonization. The vacuum degree in the vacuum reactor is 0.02-0.08MPa. The vacuum reactor is first raised to 150-200°C at a rate of 20°C / min, and kept for 10-15 minutes. At this stage, the residual moisture in the coffee grounds is fully evaporated. Then the temperature is increased to 300-400°C at a rate of 10°C / min, and the temperature is kept for 20-3...

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Abstract

The invention discloses a preparation method of coffee grounds activated carbon and belongs to the field of coffee grounds salvaging technology. The preparation method comprises the following steps: cleaning, drying and pretreating; carrying out high-temperature pyrolysis carbonization; immersing with a phosphoric acid solution; drying; activating with an active enhancer; and cleaning with distilled water to neutral level. The iodine adsorption value and methylene blue adsorption value of the prepared coffee grounds activated carbon are researched. The result shows that the iodine adsorption value is 1400-1450 mg / g, the methylene blue adsorption value is not lower than 300 mg / g, specific surface area is greater than 2,000 m<2> / g, and yield of the coffee grounds activated carbon is greaterthan 30%.

Description

Technical field [0001] The invention belongs to the technical field of coffee ground waste utilization, and in particular relates to a preparation method for preparing activated carbon by using coffee grounds. Background technique [0002] Activated carbon is mainly made of carbonaceous materials through high-temperature activation. During the high-temperature activation process, carbon microcrystals and amorphous carbon are interconnected to form pore structures of different sizes. Activated carbon is made by carbonizing raw materials such as coal, stone tar, wood, and biomass at a temperature of several hundred degrees Celsius and then activating them. In the early stage of the activated carbon industry, coal was the main raw material for the preparation of activated carbon. However, the lack of resources made people choose the raw material of activated carbon based on factors such as raw material taste, price and availability. In recent years, due to its high carbon content, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/342C01B32/324
CPCC01B32/324C01B32/342
Inventor 俞健江骐全
Owner 咖法科技(上海)有限公司
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