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Regeneration method of powdered activated carbon

A technology of powdered activated carbon and activated carbon, applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve problems such as unsatisfactory effects, achieve regeneration and resource utilization, avoid carbon dioxide emissions, and capture high efficiency Effect

Active Publication Date: 2012-07-11
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the temperature at which the organic matter adsorbed in activated carbon decomposes and desorbs during the heating process, the heating regeneration method can be divided into low-temperature heating regeneration and high-temperature heating regeneration, but the effect is not very satisfactory.

Method used

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  • Regeneration method of powdered activated carbon
  • Regeneration method of powdered activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] When the temperature in the primary regeneration furnace rises to 100°C and the temperature in the secondary regeneration furnace rises to 400°C, add caffeine-loaded activated carbon into the primary regeneration furnace at a rate of 0.9t / h. When the water content of the activated carbon drops to 8%, the dehydrated activated carbon is pushed into the secondary regeneration furnace, and the nitrogen gas velocity is 0.007m / s. At this stage, the caffeine is sublimated and the pigment is decomposed. The sublimated caffeine enters the spray tower for capture and recovery, the recovery rate of caffeine is 98%, and the regeneration rate of activated carbon is 88%.

Embodiment 2

[0023] When the temperature in the primary regeneration furnace rises to 100°C and the temperature in the secondary regeneration furnace rises to 400°C, add caffeine-loaded activated carbon into the primary regeneration furnace at a rate of 0.6t / h. When the water content of the activated carbon drops to 6%, the dehydrated activated carbon is pushed into the secondary regeneration furnace, and the nitrogen gas velocity is 0.006m / s. At this stage, the caffeine is sublimated and the pigment is decomposed. The sublimated caffeine enters the spray tower for capture and recovery, the recovery rate of caffeine is 98.5%, and the regeneration rate of activated carbon is 89%.

Embodiment 3

[0025] When the temperature in the primary regeneration furnace rises to 105°C and the temperature in the secondary regeneration furnace rises to 420°C, add caffeine-loaded activated carbon into the primary regeneration furnace at a rate of 0.5t / h. When the water content of the activated carbon drops to 5%, the dehydrated activated carbon is pushed into the secondary regeneration furnace, and the nitrogen gas velocity is 0.005m / s. At this stage, the caffeine is sublimated and the pigment is decomposed. The sublimated caffeine enters the spray tower for capture and recovery, the recovery rate of caffeine is 98%, and the regeneration rate of activated carbon is 90%.

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Abstract

The invention relates to a regeneration method of powdered activated carbon. The method utilizes the technology of continuous recovery of caffeine by two-gradient heating, and the regeneration and comprehensive resource technology of activated carbon, and has the characteristics of continuous production process, high caffeine capture efficiency, and high activated carbon regeneration rate. The caffeine is effectively recovered, and meanwhile the regeneration and resource of waste activated carbon are also realized, and the emission of carbon dioxide formed by the combustion of the waste activated carbon is avoided.

Description

technical field [0001] The invention relates to a regeneration technology of waste activated carbon, in particular to a regeneration method of powdered activated carbon. Background technique [0002] Caffeine belongs to xanthine alkaloid compound, is a kind of central nervous system stimulant, and the medicine with caffeine main component is used for treating symptoms such as neurasthenia, mental depression, headache, and effect is good, is widely used in the market now. In the caffeine production process, the synthetic route of dimethylurea using urea, monomethylamine and chloroacetic acid as basic raw materials. During the production process, activated carbon is used to decolorize and refine the synthetic crude caffeine aqueous solution. While removing pigment and other impurities, it also absorbs a large amount of caffeine, thus producing waste activated carbon loaded with caffeine. The annual discharge of waste activated carbon reaches 2,000 tons, which contains 20% caf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34B01J20/20
CPCY02C10/08Y02C20/40
Inventor 朱兆友夏丙堃王英龙马艺心
Owner QINGDAO UNIV OF SCI & TECH
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