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Regeneration method for waste active carbon in itaconic acid decoloring step

A technology for waste activated carbon and activated carbon, which is applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problem of no good treatment method for activated carbon, and achieve the effect of small carbon loss, high regeneration rate and emission reduction.

Active Publication Date: 2015-08-19
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no better treatment method for the decolorization waste activated carbon in this process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 500kg of spent activated carbon with 1250kg of ethanol solution with a mass fraction of 80%, and perform solvent regeneration at 50°C. After regeneration for 30min, filter while hot and collect the filtrate. Repeat the above steps to perform secondary solvent regeneration on the filter cake. The ethanol filtrate was distilled to obtain 80% ethanol distillate, and then 1500kg of water was used to regenerate the spent activated carbon with an inorganic solvent at 50°C for 30min. And the titration method was used to determine the content of itaconic acid in the filtrate. The thermal regeneration stage adopts the method of staged heating, first heating to 102 ° C to collect a small amount of water and ethanol remaining in the spent activated carbon, and then heating to 320 ° C and maintaining it for 1 hour to obtain regenerated carbon.

[0023] The water content of the above waste activated carbon is 10%, the content of itaconic acid is 30%, and the content of inorgani...

Embodiment 2

[0025] Mix 600kg of spent activated carbon with 1500kg of ethanol solution with a mass fraction of 75%, and perform solvent regeneration at 60°C. After regeneration for 20 minutes, filter while hot and collect the filtrate. Repeat the above steps to perform secondary solvent regeneration on the filter cake. The ethanol filtrate was distilled to obtain 90% ethanol distillate, and then 1800kg of water was used to regenerate the spent activated carbon with an inorganic solvent at 45°C for 45min. And the titration method was used to determine the content of itaconic acid in the filtrate. The thermal regeneration stage adopts the method of staged heating, first heating to 105°C to collect a small amount of water and ethanol remaining in the spent activated carbon, and then heating to 300°C and maintaining it for 1 hour to obtain regenerated carbon.

[0026] The water content of the above waste activated carbon is 15%, the content of itaconic acid is 25%, and the content of inorgan...

Embodiment 3

[0028] Mix 500kg of waste activated carbon with 1500kg of ethanol solution with a mass fraction of 90%, and perform solvent regeneration at 65°C. After regeneration for 35 minutes, filter while hot and collect the filtrate. Repeat the above steps to perform secondary solvent regeneration on the filter cake. The ethanol filtrate was distilled to obtain a 95% ethanol distillate, and then 1500 kg of water was used to regenerate the spent activated carbon with an inorganic solvent at 50° C. for 35 minutes. And the titration method was used to determine the content of itaconic acid in the filtrate. The thermal regeneration stage adopts the method of staged heating, first heating to 110 ° C to collect a small amount of water and ethanol remaining in the spent activated carbon, and then heating to 310 ° C and maintaining it for 2 hours to obtain regenerated carbon.

[0029] The water content of the above waste activated carbon is 20%, the content of itaconic acid is 35%, and the con...

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Abstract

The invention relates to a regeneration method for waste active carbon in an itaconic acid decoloring step, wherein the total cost, the regeneration rate and the economic benefit are relatively high. The method comprises the following steps: treating the undried waste active carbon in a reaction kettle, a separator, a distillation column and a regeneration kettle; and thermally decomposing pigments and other impurities through strict temperature control to realize the regeneration of the waste active carbon. According to the regeneration method provided by the invention, an ethanol solution is used as an extracting agent; the ethanol solution has a high selectivity on itaconic acid and the pigments are nearly not washed out; the extracting agent can be used for recovering itaconic acid by way of recrystallization; and the active carbon is fully regenerated, so that no secondary pollution is caused. The method provided by the invention can be used for thermally decomposing the pigments and other impurities at a relatively low temperature, and is low in energy consumption, small in carbon loss and high in regeneration rate.

Description

【Technical field】 [0001] The invention relates to a waste activated carbon regeneration technology, in particular to a regeneration method for treating waste activated carbon in the decolorization process of itaconic acid. 【Background technique】 [0002] Itaconic acid and its esters are important industrial raw materials for the production of chemical fibers such as acrylic fibers, synthetic resins, plastics, rubber, drugs, surfactants, non-toxic food packaging materials, herbicides, latex, descaling agents, adhesives, etc. Widely used in chemical, pharmaceutical, paper, textile, printing and other fields. The production methods of itaconic acid include fermentation and chemical synthesis. Among them, the production process of fermentation method has matured and has become a method commonly used at home and abroad. The fermentation method mainly uses cheap sugar and other agricultural and sideline products as fermentation raw materials, and the fermentation liquid can be o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34B01J20/20
Inventor 朱兆友王万玲王英龙马艺心张震
Owner QINGDAO UNIV OF SCI & TECH
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