CN110871057A - Activated carbon regeneration method - Google Patents
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 143
- 238000011069 regeneration method Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 54
- 230000008929 regeneration Effects 0.000 claims abstract description 28
- 238000001179 sorption measurement Methods 0.000 claims abstract description 27
- 239000011261 inert gas Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 230000001172 regenerating effect Effects 0.000 claims abstract description 10
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract 1
- 230000007420 reactivation Effects 0.000 abstract 1
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 45
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 19
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 17
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 17
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 13
- 238000003795 desorption Methods 0.000 description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 13
- 239000007789 gas Substances 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 8
- 150000001555 benzenes Chemical class 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
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- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 150000001345 alkine derivatives Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000003889 chemical engineering Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000010815 organic waste Substances 0.000 description 2
- 229920002689 polyvinyl acetate Polymers 0.000 description 2
- 239000011118 polyvinyl acetate Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 239000011354 acetal resin Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
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- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001361 allenes Chemical class 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- LLCSWKVOHICRDD-UHFFFAOYSA-N buta-1,3-diyne Chemical group C#CC#C LLCSWKVOHICRDD-UHFFFAOYSA-N 0.000 description 1
- WFYPICNXBKQZGB-UHFFFAOYSA-N butenyne Chemical group C=CC#C WFYPICNXBKQZGB-UHFFFAOYSA-N 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 238000010812 external standard method Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- MWWATHDPGQKSAR-UHFFFAOYSA-N propyne Chemical group CC#C MWWATHDPGQKSAR-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- 239000002689 soil Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- 230000002194 synthesizing effect Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
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- 231100000167 toxic agent Toxicity 0.000 description 1
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- 238000000101 transmission high energy electron diffraction Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- 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
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3458—Regenerating or reactivating using a particular desorbing compound or mixture in the gas 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
Abstract
The invention belongs to the technical field of separation of free carbon by chemical or physical change through adsorption, regeneration or reactivation, and particularly relates to an activated carbon regeneration method, which comprises the following steps: the method comprises the steps of heating inert gas, introducing the heated inert gas into the bottom of an adsorption tower filled with activated carbon for regeneration, and then sequentially passing through an alkali liquor washing tower, a gas-liquid separator and a volatile organic compound treatment device, wherein the alkali washing tower is connected with the adsorption tower through a pipeline, the gas-liquid separator is connected with the alkali washing tower through a pipeline, and the volatile organic compound treatment device is connected with the gas-liquid separator through a pipeline. The method is used for desorbing and regenerating the activated carbon with saturated benzene adsorption quantity, and the regenerated activated carbon is recycled after regeneration and has high efficiency.
Description
Technical Field
The invention belongs to the technical field of separation of substances by chemical or physical changes through a method of adsorbing, regenerating or reactivating free carbon, and particularly relates to an activated carbon regeneration method.
Background
Vinyl acetate (VAC for short), also known as vinyl acetate, is an important organic chemical raw material, is mainly used for producing derivatives such as polyvinyl acetate (PVAC), polyvinyl alcohol (PVOH), vinyl acetate-ethylene copolymer emulsion (VAE) or copolymer resin (EVA), vinyl acetate-vinyl chloride copolymer (EVC), polyacrylonitrile comonomer, acetal resin, and the like, and is widely used in the fields of coatings, slurries, adhesives, vinylon, films, leather processing, synthetic fibers, soil improvement, and the like ("technical research progress of vinyl acetate synthesis by acetylene method", niee, chemical engineering of acetaldehyde and acetic acid, paragraph 9 in 2015, paragraph 1 in the left column on page 11, and published as 12/31/2015).
The synthesis of vinyl acetate has evolved over decades and currently uses acetylene gas phase and ethylene gas phase for industrial production. From 1960 to 2011, China has 18 sets of VAC production devices, and 15 sets of VAC production devices adopt an acetylene method to prepare vinyl acetate. The abundant reserves of coal resources and natural gas resources produced in China are important reasons why the acetylene method synthesized vinyl acetate is mainstream at home and has market prospect. Acetylene and acetic acid can be catalytically reacted to synthesize vinyl acetate CH ≡ CH + CH3COOH→CH2＝CHOOCCH3(progress of research on catalyst for synthesizing vinyl acetate by acetylene method, Lidonxia et al, coal chemical engineering, volume 38, stage 10 in 2015, page 39, left column, penultimate stage 1, published as 2015, 8 months and 31 days).
Before crude acetylene with purity of about 98.5% produced in acetylene workshops and containing saturated water is sent to a vinyl acetate device to synthesize vinyl acetate, 98 wt% concentrated sulfuric acid is needed to be used for acid cleaning to remove higher Alkyne (AS) (comprising allene, methylacetylene, butadiene, vinyl acetylene, diacetylene and benzene) and saturated water in the crude acetylene, so that the acetylene purity reaches over 99.5%, and simultaneously, a large amount of waste sulfuric acid is generated. The concentration of the waste sulfuric acid absorbing the higher Alkyne (AS) and water is about 83 wt% -85 wt%, the waste sulfuric acid contains 8 wt% -15 wt% of organic matters and carbon impurities and about 2 wt% of water, the density is 1.65-1.75g/ml, the appearance is brown or blackish brown, and the waste sulfuric acid has strong pungent smell and foul smell, thereby bringing great difficulty to the treatment and the utilization.
The activated carbon can remove benzene in acetylene, however, if the adsorbed activated carbon is not regenerated, resource waste and environmental pollution are caused. Therefore, it is necessary to regenerate activated carbon, which brings economic benefits and environmental protection ("comparison of several activated carbon regeneration methods", dunlong, Hubei forestry science, 2.2012 and Total 174, pages 63-65, published 2012 and 2.29).
In the aspect of activated carbon regeneration process, relevant documents are reported. For example, patent publication No. CN102772981A discloses an apparatus for continuously adsorbing and desorbing organic waste gas by using activated carbon, which uses an adsorption bed to recover volatile organic compounds, and which simplifies the process flow, but during the regeneration of activated carbon by using the apparatus, a large amount of waste water is generated, and simultaneously, the structure of activated carbon is destroyed by water vapor, thereby affecting the life of activated carbon. Patent document No. CN102029148A discloses an organic waste gas active dry desorption device, in which a heating steam pipe is arranged in a waste gas pipe filled with activated carbon, so that steam is prevented from directly contacting the activated carbon during desorption, and the activated carbon is kept dry, thereby preventing the decrease of adsorption capacity caused by the adsorption of water by the activated carbon due to the desorption of the activated carbon directly by steam and the secondary pollution caused by the discharge of the combined steam and solvent during desorption. Patent document No. CN201940148U discloses an adsorption purification unit and an adsorption recovery device for recovering organic solvent from exhaust gas, which use an electrical heating method to desorb an activated carbon bed layer, but at the same time, an elastic pressing device is required to be arranged on the pipe wall, and a vibration device is required to be arranged under a tank to solve the problem of activated carbon bed layer loosening caused by electrical heating, so that the equipment structure is complex, the investment is large, and the maintenance is not facilitated. Patent document No. CN105080287A discloses a method for desorbing activated carbon in an activated carbon canister in a benzene vapor recovery apparatus, in which purge air is indirectly heated by steam under vacuum conditions to desorb benzene adsorbed by activated carbon at low temperature, which improves the desorption efficiency of activated carbon, but it requires vacuum conditions and is costly, and purge air is not suitable for desorption of activated carbon adsorbing trace amounts of acetylene and benzene. Fructus evodiae is heated by microwave, and activated carbon is regenerated under nitrogen-carrying condition and non-nitrogen condition respectively ("microwave radiation combined activated carbon enhanced toxic substance removal and regenerated activated carbon research", university of hui ying, doctor's academic thesis, published 2011, 12 months and 31 days). However, microwave regeneration is still under laboratory research, and industrialization needs to consider the problems of cost and production safety.
Disclosure of Invention
In view of the above, the present invention provides an activated carbon regeneration method, which can recycle activated carbon saturated in adsorption after regeneration to replace or partially replace concentrated sulfuric acid, so as to reduce the usage amount of concentrated sulfuric acid and relieve the pressure of subsequent treatment and utilization; the method does not affect the service life of the activated carbon; the method has high regeneration efficiency, and cannot cause accelerated damage and aging of the activated carbon; the device matched with the method has simple structure and is beneficial to maintenance; the method has low cost, and is suitable for desorption regeneration of the activated carbon adsorbing trace acetylene and benzene; the method can be used for industrial production.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the activated carbon regeneration method comprises the following steps:
the method comprises the steps of heating inert gas, introducing the heated inert gas into the bottom of an adsorption tower filled with activated carbon for regeneration, and then sequentially passing through an alkali liquor washing tower, a gas-liquid separator and a volatile organic compound treatment device, wherein the alkali washing tower is connected with the adsorption tower through a pipeline, the gas-liquid separator is connected with the alkali washing tower through a pipeline, and the volatile organic compound treatment device is connected with the gas-liquid separator through a pipeline.
The inert gas refers to nitrogen, helium, neon, argon, krypton, xenon and the like.
The bottom is a clear concept for a person skilled in the art.
The inventor unexpectedly finds that the activated carbon which is saturated in adsorption can be recycled by the method after being regenerated to replace or partially replace concentrated sulfuric acid, so that the using amount of the concentrated sulfuric acid is reduced, and the pressure of subsequent treatment and utilization is relieved.
The method does not affect the service life of the activated carbon.
The method has high regeneration efficiency, and can not cause accelerated damage and aging of the activated carbon.
The device matched with the method has simple structure and is beneficial to maintenance.
The method has low cost, and is suitable for desorption regeneration of activated carbon adsorbing acetylene and benzene.
The method can be used for industrial production.
Further, the heating is to be heated to 110-150 ℃, and the temperature is increased by 10 ℃ every 2 h.
Further, the heating is performed to 120-130 ℃, and the temperature is increased by 10 ℃ every 2 h.
Further, the regeneration time is 10-18 h.
Further, the regeneration time is 10-12 h.
Further, the flow rate of the inert gas is 20-603/h。
Further, the flow rate of the inert gas is 35-503/h。
Further, the space velocity of the inert gas is 1-3h-1。
Further, the space velocity of the inert gas is 1.5h-1。
The invention has the beneficial effects that:
the method is used for desorbing and regenerating the activated carbon with saturated benzene adsorption quantity, and the regenerated activated carbon is recycled after regeneration.
The method is used for desorbing and regenerating the activated carbon with saturated benzene adsorption quantity, and has high efficiency.
The method does not affect the service life of the activated carbon.
The method has high regeneration efficiency, and can not cause accelerated damage and aging of the activated carbon.
The device matched with the method has simple structure and is beneficial to maintenance.
The method has low cost, and is suitable for desorption regeneration of activated carbon adsorbing trace acetylene and benzene.
The method can be used for industrial production.
Drawings
Fig. 1 is a diagram of the desorption/regeneration apparatus in example 1, in which 1 is a nitrogen gas inlet line, 2 is a valve, 3 is a flow meter, 4 is a steam gas inlet line, 5 is a valve, 6 is a flow meter, 7 is a heater, 8 is a temperature transmitter, 9 is a valve, 10 is an activated carbon adsorption tower, 11 is an alkali washing tower, 12 is a gas-liquid separator 12, 13 is a sampling analysis valve, 14 is a valve, and 15 is a volatile organic compound processing apparatus.
Detailed Description
The examples are provided for better illustration of the present invention, but the present invention is not limited to the examples. Therefore, those skilled in the art should make insubstantial modifications and adaptations to the embodiments of the present invention in light of the above teachings and remain within the scope of the invention.
Example 1
The method comprises the following steps of regenerating the activated carbon with saturated benzene adsorption quantity according to the following device and method:
the device shown in fig. 1 is adopted to carry out desorption regeneration on activated carbon with saturated adsorption capacity, and the device mainly comprises the following structures: a valve 2 and a flowmeter 3 are arranged on the nitrogen inlet pipeline 1, and the nitrogen inlet pipeline is connected to the bottom of an activated carbon adsorption tower 10 after being connected to a heater 7 and then connected to a temperature transmitter 8 and a valve 9; a valve 5 and a flowmeter 6 are arranged on the steam inlet pipeline 4, and the steam inlet pipeline is connected with a heater 7; the active carbon adsorption tower 10 is connected with an alkali liquor washing tower 11, after the alkali liquor washing tower 11 is connected with a gas-liquid separator 12, the effluent of the separator passes through a sampling analysis valve 13 and is connected with a downstream volatile organic compound processing device 15 through a valve 14; the method specifically comprises the following steps: the valve 5 on the steam inlet line 4 is closed, the valves 2 and 9 on the nitrogen inlet line 1 are opened, and the flow of nitrogen to the heater 7 is adjusted to 20m3The space velocity is 1h-1(ii) a Then the valve 5 of the steam inlet pipeline 4 is opened, and the steam is heated by the heater 7 and then is introduced into the active carbon adsorption towerRemoving benzene from the activated carbon by 10 hours, controlling the outlet temperature of the heater to be 110 ℃ after 2 hours, increasing the outlet temperature by 10 ℃ every 2 hours, controlling the outlet maximum temperature of the heater to be 150 ℃, sampling and analyzing, and analyzing the benzene content<1ppm, benzene content measured by continuous secondary analysis<1ppm, indicating the end of regeneration, the results are shown in Table 1; the method for measuring the content of benzene in acetylene adopts a gas chromatography, and specifically comprises the following steps: the instrument is an Agilent 7890A gas chromatograph, the detector is a hydrogen flame ionization detector, the chromatographic column is a Porapak N column, and the size and the material of a column tube are phi 2mm multiplied by 0.5m stainless steel; the operating conditions were: the temperature of the vaporizing chamber is 125 ℃, the column temperature is 110 ℃, the detector temperature is 200 ℃ and the carrier gas (N)2) The flow rate is 40mL/min, the hydrogen flow rate is 40mL/min, the air flow rate is 400mL/min, and the sample injection amount is 1 mL; the gas chromatography quantitative method adopts an external standard method, and the measuring method of the correction factor is as follows: after the operation conditions of each instrument are stable, respectively injecting samples, saturating the chromatographic column by the first sample injection, continuously injecting samples twice, measuring peak areas, calculating an average value, and calculating a correction factor; the water content in acetylene is measured by an SADP type dew point measuring instrument, and the method comprises the following specific steps: connecting any one of two interfaces of a dew point instrument with a sampling port by using a polytetrafluoroethylene tube, and controlling the gas flow rate to be 5-10L/min; replacing the pipeline with sample gas for 3-5min, then plugging the outlet of the instrument with a finger, the pressure of the sample gas will open the detection head, and when the detection head of the instrument is completely opened, removing the finger (if the pressure of the sample gas is not large enough, connecting a 1-2m long tube to the outlet of the instrument, and then slowly lifting the detection head of the instrument with a hand); the instrument reading will move over the scale and then stabilize; when there is no large change in the reading, the final result is read.
Example 2
The method comprises the following steps of regenerating the activated carbon with saturated benzene adsorption quantity according to the following device and method:
the nitrogen flow rate was 40m3H, space velocity of 3h-1The experimental set-up, procedure and other parameters used were the same as in example 1.
Example 3
The method comprises the following steps of regenerating the activated carbon with saturated benzene adsorption quantity according to the following device and method:
the air flow is 60m3H, space velocity of 1.5h-1The experimental set-up, procedure and other parameters used were the same as in example 1.
Comparative example 1
The method comprises the following steps of regenerating the activated carbon with saturated benzene adsorption quantity according to the following device and method:
the nitrogen flow is 60m without heating nitrogen3H, space velocity of 1.5h-1The experimental setup, other procedures and other parameters used were the same as in example 1.
TABLE 1 measurement of benzene content
Remarking: the blank above indicates no detection.
As can be seen from Table 1, the method of the invention can realize desorption regeneration of the activated carbon with saturated benzene adsorption capacity; after 12-18h, the regenerated activated carbon was desorbed using the method of examples 1-3, i.e., benzene content was as low as 1 ppm. Therefore, the method disclosed by the invention has high efficiency and is suitable for desorption regeneration of activated carbon adsorbing trace benzene.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The activated carbon regeneration method is characterized by comprising the following steps: the method comprises the steps of heating inert gas, introducing the heated inert gas into the bottom of an adsorption tower filled with activated carbon for regeneration, and then sequentially passing through an alkali liquor washing tower, a gas-liquid separator and a volatile organic compound treatment device, wherein the alkali washing tower is connected with the adsorption tower through a pipeline, the gas-liquid separator is connected with the alkali washing tower through a pipeline, and the volatile organic compound treatment device is connected with the gas-liquid separator through a pipeline.
2. The method for regenerating activated carbon as claimed in claim 1, wherein the heating is performed by heating to 110-150 ℃ and increasing the temperature by 10 ℃ every 2 h.
3. The method for regenerating activated carbon as claimed in claim 2, wherein the heating is performed by heating to 120-130 ℃ and increasing the temperature by 10 ℃ every 2 h.
4. The activated carbon regeneration process of claim 1, 2 or 3, wherein the regeneration time is 10-18 h.
5. The activated carbon regeneration method according to claim 4, wherein the regeneration time is 10-12 h.
6. The activated carbon regeneration method according to claim 1, 2, 3, 4 or 5, wherein the flow rate of the inert gas is 20 to 603/h。
7. The activated carbon regeneration method according to claim 6, wherein the flow rate of the inert gas is 35 to 503/h。
8. The activated carbon regeneration process of claim 1, 2, 3, 4, 5, 6 or 7, wherein the inert gas has a space velocity of 1-3h-1。
9. The activated carbon regeneration process of claim 8, wherein the inert gas has a space velocity of 1.5h-1。
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| CN201811014987.7A CN110871057A (en) | 2018-08-31 | 2018-08-31 | Activated carbon regeneration method |
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| CN201811014987.7A CN110871057A (en) | 2018-08-31 | 2018-08-31 | Activated carbon regeneration method |
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| CN114247437A (en) * | 2021-12-21 | 2022-03-29 | 甘肃银光化学工业集团有限公司 | Chemical regeneration method of granular active carbon for adsorbing nitramine compound |
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