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Regeneration method of low-carbon-loss activated carbon

A technology of activated carbon and waste activated carbon, which is applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of secondary pollution of organic solvents, difficult practicability, secondary pollution of exhaust gas, etc., and achieves high-efficiency regeneration, The effect of good recovery of adsorption performance and short regeneration time

Active Publication Date: 2017-03-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the existing activated carbon regeneration methods have the following disadvantages: ①The loss of activated carbon is large; ②The adsorption capacity will decrease significantly after regeneration; ③The tail gas generated during regeneration will cause secondary pollution; ④The regeneration conditions are harsh and difficult to implement. , high cost, low economic benefit
[0006] The current mainstream of activated carbon regeneration technology is high-temperature regeneration and solvent regeneration. High-temperature regeneration cannot avoid the problem of high energy consumption. Solvent regeneration can easily cause secondary pollution of organic solvents and other issues.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The regeneration method of activated carbon comprises the following steps:

[0037] First, take the waste activated carbon (mainly containing organic matter and complex components, such as phenols, alcohols, benzene and its derivatives) after the industrial wastewater treatment of a domestic enterprise, wash the waste activated carbon with deionized water for 2 to 3 times, and remove the waste activated carbon. The acidic substances and some soluble inorganic substances can be filtered and separated to prevent side reactions with the catalyst and affect the catalytic effect;

[0038] Secondly, the activated carbon obtained by filtration and separation is mixed with Fe at a mass ratio of 0.5%. 2 o 3 As a catalyst, mix it evenly with deionized water according to the liquid-solid ratio of 2:1, add it to the p-polyphenylene hydrothermal synthesis reaction kettle, heat it to 230 ° C, the air pressure is 28 atm, keep the temperature and pressure for 1 hour, and conduct organ...

Embodiment 2

[0043] The regeneration method of activated carbon comprises the following steps:

[0044] First, wash the spent activated carbon with deionized water for 2 to 3 times to remove the acidic substances and some soluble inorganic substances in it, prevent side reactions with the catalyst and affect the catalytic effect, and filter and separate;

[0045] Secondly, the activated carbon obtained by filtration and separation is mixed with Fe with a mass ratio of 1%. 2 o 3做为催化剂,按照液固比为6:1的比例与去离子水混合均匀,加入到对位聚苯水热合成反应釜中,加热至250℃,气压为40atm,保温保压3h,进行有机物分解、溶出反应,冷却至50℃以下时取出物料;

[0046] 最后,用5%的稀盐酸将料浆稀释至液固比为30~20:1,置于超声震荡清洗器中用频率为20KHz-23KHz进行洗涤30~40min,重复2~4次,充分洗去催化剂杂质及活性炭孔隙中残余物,自然晾干即可得到再生活性炭。

[0047] 通过上述步骤得到的再生活性炭进行吸附性能、炭损进行测试对比新活性炭,得出碘吸附值恢复到新炭的94%,亚甲基蓝吸附值恢复到新炭的87%,炭损2.8%,各方面性能均满足再生要求。

Embodiment 3

[0049] 活性炭的再生方法包括以下步骤:

[0050] 首先,用去离子水洗涤废活性炭2~3次,去除其中的酸性物质及部分可溶性无机物,防止其与催化剂发生副反应而影响催化效果,并过滤、分离;

[0051] 其次,将过滤分离得到的活性炭,以质量比2%配入Fe 2 o 3 做为催化剂,按照液固比为8:1的比例与去离子水混合均匀,加入到对位聚苯水热合成反应釜中,加热至260℃,气压为47atm,保温保压3h,进行有机物分解、溶出反应,冷却至50℃以下时取出物料;

[0052] 最后,用5%的稀盐酸将料浆稀释至液固比为30~20:1,置于超声震荡清洗器中用频率为20KHz-23KHz进行洗涤30~40min,重复2~4次,充分洗去催化剂杂质及活性炭孔隙中残余物,自然晾干即可得到再生活性炭。

[0053] 通过上述步骤得到的再生活性炭进行吸附性能、炭损进行测试对比新活性炭,得出碘吸附值恢复到新炭的97%,亚甲基蓝吸附值恢复到新炭的89%,炭损3.1%,各方面性能均满足再生要求。

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PUM

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Abstract

The invention discloses a regeneration method of low-carbon-loss activated carbon. Activated carbon is pretreated by iron or an iron compound as a catalyst at lower temperature, and the synergic actions of dilution and ultrasonic washing are performed; and thus, the regenerated activated carbon with high adsorptive value is obtained under the conditions of low energy consumption and mild conditions, and the carbon loss can be reduced to a large extent.

Description

technical field [0001] The invention belongs to the field of regeneration of waste activated carbon, and in particular relates to a method for regeneration of activated carbon with low carbon loss. Background technique [0002] Activated carbon regeneration refers to the process of removing the adsorbate adsorbed on the micropores of activated carbon by physical or chemical methods without destroying the original structure of activated carbon, and restoring its adsorption performance. At present, activated carbon regeneration methods mainly include ultrasonic regeneration method, electrochemical regeneration method, superfluid regeneration method, solvent regeneration method, oxidation regeneration method, thermal regeneration method, biological regeneration method, etc. Generally, the existing activated carbon regeneration methods have the following disadvantages: ①The loss of activated carbon is large; ②The adsorption capacity will decrease significantly after regeneration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34B01J20/20
CPCB01J20/3416B01J20/3441B01J20/3475
Inventor 肖劲余柏烈仲奇凡袁杰姚桢张留运
Owner CENT SOUTH UNIV
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