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Method for regenerating powdery acticarbon

An activated carbon and alkaline technology, which is applied in the regeneration field of powdered activated carbon, can solve the problems of activated carbon damage, low, secondary pollution efficiency, etc., achieve good environmental protection and economic benefits, wide application, and reduce the amount of use.

Active Publication Date: 2009-12-02
BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, high-temperature pyrolysis may cause damage and blockage to the pore structure of activated carbon and affect its adsorption performance for colored substances; common chemical regeneration of activated carbon also has the problems of secondary pollution and low efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The amino acid content in the waste activated carbon after glycine acidification solution decolorization is about 4% to 10%, and the water content is about 40% to 50%. Add 300g of waste activated carbon into the reaction bottle, add about 400g of hot water to wash, and a large amount of glycine can be recovered. Most of the colored substances can be washed into water, and the filtered activated carbon is dried. Weigh 6g of activated carbon in a flask, add 50g of 98% concentrated sulfuric acid, soak for 1.5h, then filter, add activated carbon to 200g of acidification solution for decolorization effect For verification, the absorbance and transmittance measured by spectrometry were 0.111 and 77.4%, respectively. The obtained activated carbon is still processed according to washing and acidification, and finally the decolorization effect is carried out. The absorbance and transmittance measured by a spectrophotometer are 0.128 and 74.5%, respectively, showing that the decol...

Embodiment 2

[0014] 1.5g of fresh activated carbon was added to 150g of acidification solution to verify the decolorization effect, and the light transmittance was measured to be 65.7% by spectrometry, and 5.2g of spent activated carbon was obtained.

[0015] Put the above 5.2g spent activated carbon in the reaction flask, add about 100g of 1% lye and wash at 70°C for 2 hours, a large amount of glycine can be recovered, most of the colored substances can be washed into water, filtered by activated carbon and transferred to the flask. Add 50ml of 1+2 dilute sulfuric acid (concentration is about 50%), soak at 80°C for 1.5h, then filter, add activated carbon to 150g of acidification solution to verify the decolorization effect, and the light transmittance measured by spectrometry is 60.4% . It can be seen that the decolorization effect is basically restored to the original activated carbon effect.

Embodiment 3

[0017] Take 277.8g of deamination alkali hydrolysis solution in the reaction flask, add 42g of 98% concentrated sulfuric acid to acidify, then add 3.8g of activated carbon to the reaction flask to decolorize at 90°C for 1.5 hours, filter to obtain 10g of activated carbon filter residue, the filtrate is light yellow , The absorbance and transmittance were determined to be 0.173 and 67.2% respectively.

[0018] Take the above 10g of activated carbon filter residue in a reaction flask, add 42g of 98% concentrated sulfuric acid to soak for several hours, add it to 277.8g of deaminated alkaline hydrolysis solution, decolorize at 90°C for 1.5h, after filtering, collect the filter residue a for next application , the filtrate color is darker, in the filtrate, add 1.3g fresh activated carbon decolorization several hours, filter filtrate is pale yellow, its absorbance and transmittance are respectively 0.153 and 74.4% by spectrometry, filter residue b collects and waits to activate mech...

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PUM

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Abstract

The invention provides a novel method for activating and regenerating acticarbon and a novel process for decoloring. The invention utilizes the functions of oxidation and dehydration of sulphuric acid and carries out polymerization on organic pigment and modification on surface functional groups of the acticarbon to restore the adsorptive capacity of the acticarbon. The invention is in particular suitable for the field of preparation of amino acid through hydrolysis of amino nitrile, solves the difficult problems of difficult treatment of waste acticarbon, serious environmental pollution in the transferring and recycling process, high energy consumption and material consumption and poor applying effect, can achieve online recycling and use, can greatly reduce the use amount of the acticarbon and reclaim products entrained in the acticarbon; and the provided method is simple, is wide in application surface, clean and environment-friendly and has good environmental protection benefit and economic benefit.

Description

technical field [0001] The invention relates to a method for removing a large amount of colored substances produced in the process of synthesizing amino acids from hydroxynitrile compounds and a new process technology for the regeneration cycle of active carbon as an effective decolorizing agent. Background technique [0002] Activated carbon is a carbonaceous adsorption material with a highly developed pore structure and a large specific surface area. Its main performance is a strong adsorption capacity for molecules. Activated carbon has been widely used in many fields, such as food industry It can be used as a component of primary batteries, electrodes of electric double layer capacitors, gas masks for military and civilian use, storage of natural gas and acetylene, etc. Activated carbon can treat trauma, gastrointestinal disorders, Abdominal sepsis, lower blood alcohol content, lower blood lipids, etc. If the resulting large amount of waste charcoal is not treated, it w...

Claims

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Application Information

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IPC IPC(8): B01J20/34B01J20/20C07C229/08C07C227/40
Inventor 喻宏贵尹应武罗伟
Owner BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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