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Regeneration method of waste activated carbon and application

A technology of activated carbon and vacuum pyrolysis, applied in the field of materials, can solve the problems of high cost, large energy consumption of thermal regeneration, small action volume, etc., and achieve the effects of short regeneration cycle, high regeneration efficiency and wide application.

Active Publication Date: 2019-04-16
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ultrasonic treatment has limited radiation range and small action volume, making it difficult to apply in engineering
The microwave regeneration process requires the use of specific regeneration equipment. The structure of the microwave regeneration equipment is complex and the cost is high, which increases the investment cost of the enterprise's equipment.
Traditional thermal regeneration consumes a lot of energy, and the adsorbate is easily carbonized in the pores of activated carbon, so it needs to be used in combination with other regeneration methods

Method used

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  • Regeneration method of waste activated carbon and application
  • Regeneration method of waste activated carbon and application
  • Regeneration method of waste activated carbon and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The waste activated carbon was subjected to vacuum pyrolysis for the first time, the vacuum degree was controlled at 0.06MPa, the heating rate was 5°C / min, the pyrolysis temperature was 250°C, and the holding time was 60min to obtain primary treated activated carbon.

[0046] Mix the primary activated carbon with the regeneration solvent at a material-to-liquid ratio of 50g / L, and shake the shaker to promote the regeneration solvent to diffuse-desorb-dissolve organic matter in the inner pores of the activated carbon. The volume percentage of the regeneration solvent includes 40% methanol, 20% acetone, 20% dichloromethane, 10% ethanol, and 10% isopropanol; The solid and liquid were separated by filtration to obtain activated carbon for secondary treatment.

[0047] After the secondary treatment activated carbon was kept at 200°C for 30 minutes, the temperature was continued to rise to 450°C for the second vacuum pyrolysis, the vacuum degree was 0.08MPa, the heating rate ...

Embodiment 2

[0051] The waste activated carbon in the decolorization stage of pharmaceutical production is subjected to the first vacuum pyrolysis, the vacuum degree is controlled at 0.07MPa, the heating rate is 4°C / min, the pyrolysis temperature is 200°C, and the holding time is 90min to obtain the primary treatment activated carbon. The pigment waste liquid is collected and processed after cooling.

[0052] Mix the primary activated carbon with the regenerated solvent at a material-to-liquid ratio of 200g / L, and shake the shaker to promote the diffusion-desorption-dissolve organic matter of the regenerated solvent in the inner pores of the activated carbon. The volume percentage of the regeneration solvent includes 50% methanol, 15% acetone, 15% methylene chloride, 10% ethanol, and 10% isopropanol; the temperature of the shaker is 50°C, and the shaking speed is 130r / min. The solid-liquid is separated to obtain activated carbon for secondary treatment, and the filtrate is collected in a f...

Embodiment 3

[0056] The waste activated carbon in the decolorization stage of pharmaceutical production is subjected to the first vacuum pyrolysis, the vacuum degree is controlled at 0.08MPa, the heating rate is 3°C / min, the pyrolysis temperature is 220°C, and the holding time is 30min to obtain the primary treatment activated carbon. The pigment waste liquid is collected and processed after cooling.

[0057] Mix the primary activated carbon with the regeneration solvent at a material-to-liquid ratio of 100g / L, and shake the shaker to promote the diffusion-desorption-dissolve organic matter of the regeneration solvent in the inner pores of the activated carbon. The volume percentage of the regeneration solvent includes 45% methanol, 18% acetone, 17% dichloromethane, 10% ethanol, and 10% isopropanol; The solid-liquid is separated by filtration to obtain activated carbon for secondary treatment, and the filtrate is collected in a filtrate collection bottle.

[0058] After the secondary trea...

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Abstract

The invention provides a regeneration method of waste activated carbon and application. The regeneration method of the waste activated carbon comprises the following steps of conducting primary vacuumpyrolysis on the waste activated carbon to obtain first treated activated carbon; mixing the first treated activated carbon with a regeneration solvent, and conducting vibration treatment after solid-liquid separation to obtain second treated activated carbon; conducting insulation treatment on the second treated activated carbon, and conducting secondary vacuum pyrolysis to obtain regenerated activated carbon. According to the application of the regeneration method of the waste activated carbon, the regeneration method is used for regeneration of the waste powdered activated carbon in the decoloring stage of medicine production. According to the regeneration method of the waste activated carbon, the regeneration efficiency is high, and the period is short. In the regeneration process, noacid-base waste liquor is generated, and the regeneration solvent can be recycled multiple times after being distilled and recycled. The adsorption capability and the specific area of the activated carbon are restored, and the index of the regenerated activated carbon reaches or even exceeds that of new activated carbon.

Description

technical field [0001] The invention relates to the field of materials, in particular to a regeneration method and application of waste activated carbon. Background technique [0002] Activated carbon is widely used in the purification of gaseous and liquid streams due to its large specific surface area, well-developed pore structure, and strong adsorption capacity. Powdered activated carbon has fast filtration speed and strong decolorization and deodorization ability, and has been widely used in the fields of medicine, food and printing and dyeing wastewater decolorization. The saturated activated carbon is often replaced by fresh activated carbon, which is often landfilled or incinerated, resulting in economic waste and environmental pollution. [0003] At present, the methods for activated carbon regeneration reported at home and abroad include: thermal regeneration, chemical reagent regeneration, biological regeneration, electrochemical regeneration, microwave regenerat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34
CPCB01J20/3416B01J20/3475B01J20/3483
Inventor 袁红刘威
Owner BEIFANG UNIV OF NATITIES
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