Regeneration method of activated carbon for treating ibuprofen decolorization process

A technology of activated carbon and process, which is applied in the regeneration field of activated carbon in the ibuprofen decolorization process, and achieves the effects of low total cost, small carbon loss and low energy consumption

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

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Problems solved by technology

[0003] The present invention overcomes the deficiencies in the prior art, and proposes a method for regenerating waste activated carbon in the ibuprofen decolorization process with lower total cost, higher regeneration rate and higher economic benefits. The method selects ethanol solution as the extraction agent, which not only solves the pr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix 1000kg of activated carbon with 6250kg of ethanol solution with a mass fraction of 75%, and perform solvent regeneration at 60°C. After regeneration for 1 hour, filter while hot and collect the filtrate. Repeat the above steps to perform secondary solvent regeneration on the filter cake, and determine the ibuprofen content in the filtrate by titration. In the thermal regeneration stage, staged heating is adopted. First, heat to 105°C to collect a small amount of water and ethanol remaining in the activated carbon, and then heat to 300°C for 1 hour to obtain regenerated carbon.

[0015] The water content of the above-mentioned waste activated carbon is 14%, and the ibuprofen content is 25%. Determined by analysis, the recovery rate of ibuprofen was 91%, and the regeneration rate of activated carbon was 82%.

Embodiment 2

[0017] Mix 500kg of activated carbon with 3120kg of ethanol solution with a mass fraction of 75%, and perform solvent regeneration at 62°C. After regeneration for 1 hour, filter while hot and collect the filtrate. Repeat the above steps to perform secondary solvent regeneration on the filter cake, and determine the ibuprofen content in the filtrate by titration. In the thermal regeneration stage, staged heating is adopted. First, heat to 105°C to collect a small amount of water and ethanol remaining in the activated carbon, and then heat to 305°C for 1 hour to obtain regenerated carbon.

[0018] The water content of the above-mentioned waste activated carbon is 15%, and the ibuprofen content is 24%. Determined by analysis, the recovery rate of ibuprofen was 90%, and the recovery rate of activated carbon was 81%.

Embodiment 3

[0020] Mix 2000kg of activated carbon with 12490kg of ethanol solution with a mass fraction of 75%, and perform solvent regeneration at 60°C. After regeneration for 1 hour, filter while hot and collect the filtrate. Repeat the above steps to perform secondary solvent regeneration on the filter cake, and determine the ibuprofen content in the filtrate by titration. 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 activated carbon, and then heating to 302°C and maintaining it for 1 hour to obtain regenerated carbon.

[0021] The water content of the above-mentioned waste activated carbon is 14%, and the ibuprofen content is 24%. Determined by analysis, the recovery rate of ibuprofen was 93%, and the regeneration rate of activated carbon was 81%.

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Abstract

The invention relates to a regeneration method of activated carbon for treating ibuprofen decolorization process. After un-dried waste activated carbon is put in a reactor, a separator and a regeneration kettle, the pigment and other impurities are subjected to thermal decomposition by strict temperature control to realize the regeneration of activated carbon. An ethanol solution is used as an extractant, so that the problem that a novel adsorbent possibly can be introduced in a solvent regeneration process can be solved, and the ethanol solution has high selectivity of ibuprofen, and almost can not wash the pigment out at the same time, the ibuprofen can be recovered with the extractant in a recrystallized way, the regeneration is full, and no secondary pollution is generated. By the method, the pigment and other impurities can be thermally decomposed at low temperature, the energy consumption is low, the carbon loss is low and the regeneration rate is high.

Description

technical field [0001] The invention relates to a waste activated carbon regeneration technology, in particular to a regeneration method for treating activated carbon in the ibuprofen decolorization process. Background technique [0002] Ibuprofen is a non-steroidal anti-inflammatory analgesic drug, which has the advantages of good therapeutic effect and small side effects, and has been developed rapidly in recent years. At present, a variety of synthetic methods of ibuprofen have been developed, but only epoxy carboxylate method and IBPE carbonylation method are truly industrialized. The ibuprofen produced by the above two methods has a darker color except for a certain amount of impurities. If it is not refined and purified, it cannot meet the requirements of pharmaceutical grade ibuprofen. At present, activated carbon is often used in industry to adsorb and decolorize ibuprofen, and then obtain pure ibuprofen through a process of recrystallization. This just needs to co...

Claims

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Application Information

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IPC IPC(8): B01J20/34B01J20/20C07C57/30C07C51/42C07C51/43
Inventor 王英龙张玲朱兆友牛志芳
Owner QINGDAO UNIV OF SCI & TECH
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