CN112090420A - Active carbon desorption recovery method - Google Patents
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- CN112090420A CN112090420A CN202010926452.8A CN202010926452A CN112090420A CN 112090420 A CN112090420 A CN 112090420A CN 202010926452 A CN202010926452 A CN 202010926452A CN 112090420 A CN112090420 A CN 112090420A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 182
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000011084 recovery Methods 0.000 title claims abstract description 39
- 238000003795 desorption Methods 0.000 title claims abstract description 33
- 229910052799 carbon Inorganic materials 0.000 title description 9
- 238000001914 filtration Methods 0.000 claims abstract description 39
- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 238000003756 stirring Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 239000003960 organic solvent Substances 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 46
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 40
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 32
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 30
- 239000007789 gas Substances 0.000 claims description 28
- 230000008569 process Effects 0.000 claims description 17
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 16
- 239000011259 mixed solution Substances 0.000 claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 239000003570 air Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000011148 porous material Substances 0.000 description 11
- 238000011069 regeneration method Methods 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 8
- 230000008929 regeneration Effects 0.000 description 6
- 238000005119 centrifugation Methods 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- -1 thermal regeneration Chemical compound 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3475—Regenerating or reactivating using a particular desorbing compound or mixture in the liquid phase
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3483—Regenerating or reactivating by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Carbon And Carbon Compounds (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses an activated carbon desorption recovery method, which comprises the following steps: mixing the activated carbon to be desorbed and recovered with an organic solvent in a reaction kettle, heating to a first temperature, continuously stirring, standing and filtering; mixing the filtered activated carbon and water in a reaction kettle, introducing gas into the reaction kettle and stirring; heating to a second temperature, continuously stirring, standing and then filtering for the second time; and drying the activated carbon subjected to secondary filtration to obtain the activated carbon subjected to desorption and recovery. The invention greatly improves the desorption and recovery efficiency of the activated carbon.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a method for desorption and recovery of activated carbon.
Background
The activated carbon is a carbon which is subjected to a special activation treatment. The activated carbon has a large amount of fine pores on the surface, so that the activated carbon forms a huge surface area and has strong adsorption capacity. Activated carbon is widely used in various industries as a common raw material for adsorption and purification.
The adsorption capacity of the activated carbon after long-term use is greatly reduced, a large amount of waste carbon can be generated after the activated carbon is used to become solid waste, and if the activated carbon is not treated, environmental pollution and resource waste can be caused. The prior art has various methods for desorbing and recovering the activated carbon, such as: thermal regeneration, biological regeneration, chemical solution regeneration, and the like. The adsorption efficiency of the activated carbon regenerated by the thermal regeneration method may be reduced, and the adsorption performance may be lost by the repeated regeneration. The biological regeneration method is only suitable for saturated carbon adsorbing organic matters which are easily decomposed by microorganisms, and the decomposition reaction must be complete, otherwise, the organic matters can be re-adsorbed by activated carbon. The chemical solution regeneration method is more suitable for reversible adsorption, but the regeneration of the method is not thorough, micropores are easy to block, the recovery rate of the adsorption performance is influenced, and the adsorption performance is obviously reduced after repeated regeneration.
The development of the desorption and recovery method of the activated carbon with better desorption effect and longer duration has very important significance for the recycling of the activated carbon and the environmental protection.
Disclosure of Invention
In view of the above, the present invention provides a method for desorption and recovery of activated carbon. The method comprises the following steps: mixing the activated carbon to be desorbed and recovered with an organic solvent in a reaction kettle, heating to a first temperature, continuously stirring, standing and filtering; mixing the filtered activated carbon and water in a reaction kettle, introducing gas into the reaction kettle and stirring; heating to a second temperature, continuously stirring, standing and then filtering for the second time; and drying the activated carbon subjected to secondary filtration to obtain the activated carbon subjected to desorption and recovery.
Optionally, the organic solvent comprises one or more of ethanol, acetone, methanol, tetrahydrofuran.
Optionally, the organic solvent is a mixed solution of ethanol, acetone, and tetrahydrofuran.
Optionally, in the mixed solution, the volume ratio of ethanol, acetone and tetrahydrofuran is 2: 2: 1.
optionally, the first temperature is 50-70 ℃.
Optionally, the gas is one of nitrogen, air, and carbon dioxide.
Optionally, the gas is air.
Optionally, the process of introducing the gas into the reaction kettle is performed at room temperature.
Optionally, the second temperature is 85-100 ℃.
Optionally, the drying temperature is 150-.
The recovery method in the prior art is difficult to thoroughly solve the problem of activated carbon micropore blockage. In the recovery process, air is firstly blown into an extracting agent (such as water) at a lower temperature and stirred to generate a large number of fine bubbles to be attached to micropores of the activated carbon which are not completely unblocked, and then the system is heated to ensure that the bubbles expand in volume to escape from the micropores, thereby promoting desorption of the blocking substances and the activated carbon. The invention greatly improves the desorption and recovery efficiency of the activated carbon.
Detailed Description
In order to better understand the present invention, the following examples further illustrate the invention, the examples are only used for explaining the invention, not to constitute any limitation of the invention.
Example 1
An activated carbon desorption recovery method comprises the following steps:
mixing the activated carbon to be desorbed and recovered with an organic solvent in a reaction kettle; wherein the organic solvent can be mixed solution of ethanol, acetone, methanol, and tetrahydrofuran; the volume ratio of ethanol, acetone, methanol and tetrahydrofuran can be 1: 1: 2: 1; the reaction kettle can be selected from conventional reaction kettles with heating and ventilating functions on the market.
Subsequently, heating to a first temperature and continuously stirring, wherein the first temperature can be 50 ℃;
after reacting for 2 hours, standing, and then filtering, wherein the filtering can be performed by selecting the existing filter screen with proper size, or other filtering methods in the prior art, such as centrifugation and then filtering; pouring off the organic solvent for the next use;
mixing the filtered activated carbon and water in a reaction kettle, introducing gas into the reaction kettle and stirring; the gas may be air; the process is carried out at room temperature; the process of ventilation and stirring ensures that the introduced gas generates a large amount of fine bubbles to enter active carbon pores;
heating to a second temperature and continuously stirring, wherein the second temperature can be 85 ℃; the heating and stirring process ensures that the volume of the gas entering the pores of the activated carbon expands and escapes, so that impurities originally blocked in the micropores of the activated carbon are desorbed from the activated carbon;
heating, standing, and filtering for the second time;
and drying the activated carbon subjected to secondary filtration at 150 ℃ to obtain the activated carbon subjected to desorption and recovery.
The recovery rate of activated carbon in this example was 96%.
Example 2
An activated carbon desorption recovery method comprises the following steps:
mixing the activated carbon to be desorbed and recovered with an organic solvent in a reaction kettle; wherein the organic solvent can be mixed solution of ethanol, acetone and tetrahydrofuran; the volume ratio of ethanol, acetone and tetrahydrofuran can be 2: 2: 1; the reaction kettle can be selected from conventional reaction kettles with heating and ventilating functions on the market.
Subsequently, heating to a first temperature and continuously stirring, wherein the first temperature can be 70 ℃;
after reacting for 2 hours, standing, and then filtering, wherein the filtering can be performed by selecting the existing filter screen with proper size, or other filtering methods in the prior art, such as centrifugation and then filtering; pouring off the organic solvent for the next use;
mixing the filtered activated carbon and water in a reaction kettle, introducing gas into the reaction kettle and stirring; the gas may be air; the process is carried out at room temperature; the process of ventilation and stirring ensures that the introduced gas generates a large amount of fine bubbles to enter active carbon pores;
heating to a second temperature and continuously stirring, wherein the second temperature can be 100 ℃; the heating and stirring process ensures that the volume of the gas entering the pores of the activated carbon expands and escapes, so that impurities originally blocked in the micropores of the activated carbon are desorbed from the activated carbon;
heating, standing, and filtering for the second time;
and drying the activated carbon subjected to secondary filtration at 250 ℃ to obtain the activated carbon subjected to desorption and recovery.
The recovery of activated carbon in this example was 97%.
Example 3
An activated carbon desorption recovery method comprises the following steps:
mixing the activated carbon to be desorbed and recovered with an organic solvent in a reaction kettle; wherein the organic solvent can be mixed solution of ethanol, acetone, methanol, and tetrahydrofuran; the volume ratio of ethanol, acetone, methanol and tetrahydrofuran can be 2: 2: 1; the reaction kettle can be selected from conventional reaction kettles with heating and ventilating functions on the market.
Subsequently, heating to a first temperature, which may be 60 ℃, followed by continuous stirring;
after reacting for 2 hours, standing, and then filtering, wherein the filtering can be performed by selecting the existing filter screen with proper size, or other filtering methods in the prior art, such as centrifugation and then filtering; pouring off the organic solvent for the next use;
mixing the filtered activated carbon and water in a reaction kettle, introducing gas into the reaction kettle and stirring; the gas may be carbon dioxide; the process is carried out at room temperature; the process of ventilation and stirring ensures that the introduced gas generates a large amount of fine bubbles to enter active carbon pores;
heating to a second temperature and continuously stirring, wherein the second temperature can be 80 ℃; the heating and stirring process ensures that the volume of the gas entering the pores of the activated carbon expands and escapes, so that impurities originally blocked in the micropores of the activated carbon are desorbed from the activated carbon;
heating, standing, and filtering for the second time;
and drying the activated carbon subjected to secondary filtration at 200 ℃ to obtain the activated carbon subjected to desorption and recovery.
The recovery of activated carbon in this example was 94%.
Example 4
An activated carbon desorption recovery method comprises the following steps:
mixing the activated carbon to be desorbed and recovered with an organic solvent in a reaction kettle; wherein the organic solvent can be a mixed solution of ethanol, methanol and tetrahydrofuran; the volume ratio of ethanol, methanol and tetrahydrofuran can be 1: 2: 1; the reaction kettle can be selected from conventional reaction kettles with heating and ventilating functions on the market.
Subsequently, heating to a first temperature and continuously stirring, wherein the first temperature can be 50 ℃;
after reacting for 2 hours, standing, and then filtering, wherein the filtering can be performed by selecting the existing filter screen with proper size, or other filtering methods in the prior art, such as centrifugation and then filtering; pouring off the organic solvent for the next use;
mixing the filtered activated carbon and water in a reaction kettle, introducing gas into the reaction kettle and stirring; the gas may be air; the process is carried out at room temperature; the process of ventilation and stirring ensures that the introduced gas generates a large amount of fine bubbles to enter active carbon pores;
heating to a second temperature and continuously stirring, wherein the second temperature can be 85 ℃; the heating and stirring process ensures that the volume of the gas entering the pores of the activated carbon expands and escapes, so that impurities originally blocked in the micropores of the activated carbon are desorbed from the activated carbon;
heating, standing, and filtering for the second time;
and drying the activated carbon subjected to secondary filtration at 150 ℃ to obtain the activated carbon subjected to desorption and recovery.
The recovery of activated carbon in this example was 95%.
Example 5
An activated carbon desorption recovery method comprises the following steps:
mixing the activated carbon to be desorbed and recovered with an organic solvent in a reaction kettle; wherein the organic solvent can be mixed solution of ethanol, acetone, methanol, and tetrahydrofuran; the volume ratio of ethanol, acetone, methanol and tetrahydrofuran can be 1: 1: 2: 1; the reaction kettle can be selected from conventional reaction kettles with heating and ventilating functions on the market.
Subsequently, heating to a first temperature, which may be 60 ℃, followed by continuous stirring;
after reacting for 2 hours, standing, and then filtering, wherein the filtering can be performed by selecting the existing filter screen with proper size, or other filtering methods in the prior art, such as centrifugation and then filtering; pouring off the organic solvent for the next use;
mixing the filtered activated carbon and water in a reaction kettle, introducing gas into the reaction kettle and stirring; the gas may be air; the process is carried out at room temperature; the process of ventilation and stirring ensures that the introduced gas generates a large amount of fine bubbles to enter active carbon pores;
heating to a second temperature and continuously stirring, wherein the second temperature can be 90 ℃; the heating and stirring process ensures that the volume of the gas entering the pores of the activated carbon expands and escapes, so that impurities originally blocked in the micropores of the activated carbon are desorbed from the activated carbon;
heating, standing, and filtering for the second time;
and drying the activated carbon subjected to secondary filtration at 220 ℃ to obtain the activated carbon subjected to desorption and recovery.
The recovery rate of activated carbon in this example was 93%.
It should be noted that the steps and methods adopted in the claims of the present invention are the same as those of the above-mentioned embodiments, and for the sake of avoiding redundancy, the present invention describes the preferred embodiments, but those skilled in the art can make other changes and modifications to these embodiments once they learn the basic inventive concept. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for desorption and recovery of activated carbon is characterized by comprising the following steps:
mixing the activated carbon to be desorbed and recovered with an organic solvent in a reaction kettle, heating to a first temperature, continuously stirring, standing and filtering;
mixing the filtered activated carbon and water in a reaction kettle, introducing gas into the reaction kettle and stirring;
heating to a second temperature, continuously stirring, standing and then filtering for the second time;
and drying the activated carbon subjected to secondary filtration to obtain the activated carbon subjected to desorption and recovery.
2. The method for desorption and recovery of activated carbon according to claim 1, characterized in that: the organic solvent comprises one or more of ethanol, acetone, methanol and tetrahydrofuran.
3. The method for desorption and recovery of activated carbon according to claim 2, characterized in that: the organic solvent is a mixed solution of ethanol, acetone and tetrahydrofuran.
4. The method for desorption recovery of activated carbon according to claim 3, characterized in that: in the mixed solution, the volume ratio of ethanol to acetone to tetrahydrofuran is 2: 2: 1.
5. the method for desorption and recovery of activated carbon according to claim 1, characterized in that: the first temperature is 50-70 ℃.
6. The method for desorption and recovery of activated carbon according to claim 1, characterized in that: the gas is one of nitrogen, air and carbon dioxide.
7. The method for desorption and recovery of activated carbon according to claim 6, characterized in that: the gas is air.
8. The method for desorption and recovery of activated carbon according to claim 1, characterized in that: the process of introducing gas into the reaction kettle is carried out at room temperature.
9. The method for desorption and recovery of activated carbon according to claim 1, characterized in that: the second temperature is 85-100 ℃.
10. The method for desorption and recovery of activated carbon according to claim 1, characterized in that: the drying temperature is 150-250 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010926452.8A CN112090420A (en) | 2020-09-07 | 2020-09-07 | Active carbon desorption recovery method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010926452.8A CN112090420A (en) | 2020-09-07 | 2020-09-07 | Active carbon desorption recovery method |
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| CN112090420A true CN112090420A (en) | 2020-12-18 |
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| CN202010926452.8A Pending CN112090420A (en) | 2020-09-07 | 2020-09-07 | Active carbon desorption recovery method |
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Application publication date: 20201218 |