CN113651323A - Production process of wood activated carbon - Google Patents
Production process of wood activated carbon Download PDFInfo
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- CN113651323A CN113651323A CN202110892031.2A CN202110892031A CN113651323A CN 113651323 A CN113651323 A CN 113651323A CN 202110892031 A CN202110892031 A CN 202110892031A CN 113651323 A CN113651323 A CN 113651323A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 239000002023 wood Substances 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229920002472 Starch Polymers 0.000 claims abstract description 58
- 239000008107 starch Substances 0.000 claims abstract description 58
- 235000019698 starch Nutrition 0.000 claims abstract description 58
- 230000004913 activation Effects 0.000 claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 28
- 238000003763 carbonization Methods 0.000 claims abstract description 22
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000012986 modification Methods 0.000 claims abstract description 16
- 230000004048 modification Effects 0.000 claims abstract description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000002791 soaking Methods 0.000 claims abstract description 9
- 239000011780 sodium chloride Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 53
- 238000005422 blasting Methods 0.000 claims description 35
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- 239000000440 bentonite Substances 0.000 claims description 31
- 229910000278 bentonite Inorganic materials 0.000 claims description 31
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 31
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 27
- 229910021389 graphene Inorganic materials 0.000 claims description 24
- 229920000877 Melamine resin Polymers 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 20
- 239000003431 cross linking reagent Substances 0.000 claims description 17
- 235000013336 milk Nutrition 0.000 claims description 13
- 239000008267 milk Substances 0.000 claims description 13
- 210000004080 milk Anatomy 0.000 claims description 13
- 229910021538 borax Inorganic materials 0.000 claims description 10
- 239000005539 carbonized material Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- MSJMDZAOKORVFC-UAIGNFCESA-L disodium maleate Chemical compound [Na+].[Na+].[O-]C(=O)\C=C/C([O-])=O MSJMDZAOKORVFC-UAIGNFCESA-L 0.000 claims description 6
- 239000012286 potassium permanganate Substances 0.000 claims description 6
- -1 rare earth lanthanum chloride Chemical class 0.000 claims description 6
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 6
- 239000001509 sodium citrate Substances 0.000 claims description 6
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 claims description 5
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 5
- 239000004328 sodium tetraborate Substances 0.000 claims description 5
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 claims description 5
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 238000001179 sorption measurement Methods 0.000 abstract description 5
- 238000004880 explosion Methods 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 description 15
- 235000002639 sodium chloride Nutrition 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 235000013312 flour Nutrition 0.000 description 6
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 description 1
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 108010064851 Plant Proteins Proteins 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229920006221 acetate fiber Polymers 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 235000021120 animal protein Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 235000013409 condiments Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000007380 fibre production Methods 0.000 description 1
- 235000013922 glutamic acid Nutrition 0.000 description 1
- 239000004220 glutamic acid Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 235000021118 plant-derived protein Nutrition 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 150000003722 vitamin derivatives Chemical class 0.000 description 1
- 235000014101 wine Nutrition 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/342—Preparation characterised by non-gaseous activating agents
- C01B32/348—Metallic compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08G12/30—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with substituted triazines
- C08G12/32—Melamines
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention provides a production process of wood activated carbon, which comprises the following steps: soaking wood powder of 100-mesh and 200-mesh in hydrochloric acid solution at 70-80 ℃ for 10-20min, and then performing proton irradiation treatment with irradiation power of 200-mesh and 400W for 10-20min to obtain the active wood powder. In the production of the wood activated carbon, hydrochloric acid is firstly adopted for soaking, then proton treatment is adopted, so that the wood activated carbon is subjected to microscopic state treatment, a micropore structure is generated on the surface of the wood activated carbon, then the wood activated carbon is subjected to improvement treatment with starch modification liquid, sodium chloride is added in the improvement for electrification treatment, so that the improvement effect is improved, and in addition, carbonization and steam explosion treatment, primary activation treatment and secondary activation treatment are carried out, so that the obtained activated carbon has excellent strength performance and adsorption performance.
Description
Technical Field
The invention relates to the technical field of activated carbon, in particular to a production process of wood activated carbon.
Background
The wood activated carbon is prepared by taking high-quality firewood, wood chips, wood blocks, coconut shells, fruit shells and the like as raw materials and adopting the current popular process according to the national standard of the wood activated carbon (GB/T13803.2-1999): such as physical method, phosphoric acid method and zinc chloride method. Due to the characteristics, the application range is wide: 1. gas phase adsorption; 2. the recovery of organic solvent (the recovery of benzene gas toluene, xylene, acetone in the acetate fiber industry, the recovery of CS2 in the viscose staple fiber production, etc.); 3. the impurity and the harmful gas with high absorption and desorption can be removed, and the product of glutamic acid and salt, lactic acid and salt, citric acid and salt, wine, condiment, animal and plant protein, biochemical product, medical intermediate, vitamin, antibiotic, etc. can be decolorized, refined, deodorized, decontaminated water, and the impurity can be removed.
The existing wood activated carbon has simple production process, and the adsorption performance and the strength of the activated carbon are general, so that further improvement treatment is needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a production process of wood activated carbon.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a production process of wood activated carbon, which comprises the following steps:
the method comprises the following steps: soaking 100-mesh 200-mesh wood powder in a hydrochloric acid solution for 10-20min at 70-80 ℃, and then performing proton irradiation treatment with irradiation power of 200-mesh 400W for 10-20min to obtain active wood powder:
step two: sending the active wood powder into starch modification liquid, performing ultrasonic dispersion with ultrasonic power of 100-500W for 10-20min, then adding sodium chloride accounting for 10-20% of the total weight of the wood powder, and then performing electrification treatment to obtain modified wood powder after the treatment is finished;
step three: feeding the modified wood powder into a carbonization furnace for carbonization treatment, and obtaining a carbonized material after carbonization;
step four: sending the carbonized material into a steam blasting machine for blasting treatment, wherein the blasting pressure is 1-5MPa, the blasting time is 10-20min, and after blasting is finished, obtaining an active carbon blasting material;
step five: and (3) carrying out primary activation treatment and secondary activation treatment on the activated carbon blasting material, and obtaining the wood activated carbon after the treatment is finished.
Preferably, the preparation method of the starch modifying solution comprises the following steps:
s1: feeding starch into deionized water to prepare starch milk with the mass fraction of 30-50%; then adding potassium permanganate accounting for 20 percent of the total mass of the starch, then raising the temperature of the starch milk to 40-50 ℃, then adding sodium hydroxide, and adjusting the pH of the solution to 10.0-11.0 to obtain an active starch solution;
s2: feeding bentonite into a sodium citrate solution with the mass fraction of 20-30% according to the weight ratio of 1:3, stirring at the stirring speed of 100-200r/min for 20-30min, then adding rare earth lanthanum chloride accounting for 20-30% of the total weight of the bentonite, continuing stirring for 15-25min, and obtaining an ionic bentonite solution after stirring;
s3: mixing the active starch solution and the ionic bentonite solution according to the weight ratio of 2:1, stirring at the rotating speed of 500-1000r/min for 30-40min, then adding the graphene cross-linking agent accounting for 10-20% of the total amount of the ionic bentonite solution, continuing stirring for 10-20min, and obtaining the starch modification solution after stirring.
Preferably, the preparation method of the graphene cross-linking agent comprises the following steps: mixing graphene and melamine formaldehyde resin according to the weight ratio of 1:3, then adding the mixture into a sodium maleate solution with the mass fraction of 30-40%, stirring the mixture for 20-30min at the rotating speed of 300-400r/min, wherein the stirring temperature is 75-85 ℃, and after the stirring is finished, obtaining the graphene cross-linking agent.
Preferably, the preparation method of the melamine formaldehyde resin comprises the following steps: feeding formaldehyde into a sodium hydroxide solution according to the weight ratio of 1:2, then adding sodium tetraborate with the total formaldehyde amount of 20-30%, then adding melamine with the total formaldehyde amount of 70-80%, then heating the reaction temperature to 60-70 ℃, and reacting for 1-2h to obtain the melamine-formaldehyde resin.
Preferably, the voltage of the electrifying treatment is 100-200V, the treatment time is 20-30min, and the frequency is 50-100 HZ.
Preferably, the voltage of the electrifying treatment is 150V, the treatment time is 25min, and the frequency is 75 HZ.
Preferably, the specific operation steps of the carbonization treatment are as follows: the temperature is increased to 400 ℃ and 500 ℃, the reaction is carried out for 10-20min, then the temperature is increased to 650 ℃ at the speed of 1 ℃/min, the reaction is carried out for 5-10min, and finally the temperature is reduced to the room temperature at the speed of 1-5 ℃/min.
Preferably, the first-stage activation treatment adopts infrared radiation for 10-20min, and the radiation power is 100-300W.
Preferably, the first-stage activation treatment is activated for 10-20min at the temperature of 200-250 ℃, and sodium borate solution with the mass fraction of 20% is sprayed during the activation.
Preferably, the spraying is carried out for 3min at a speed of 1-5L/min.
Compared with the prior art, the invention has the following beneficial effects:
(1) in the production of the wood activated carbon, hydrochloric acid is firstly adopted for soaking, then proton treatment is adopted, so that the wood activated carbon is subjected to microscopic state treatment, a micropore structure is generated on the surface of the wood activated carbon, then the wood activated carbon is subjected to improvement treatment with starch modification liquid, sodium chloride is added in the improvement for electrification treatment, so that the improvement effect is improved, and in addition, carbonization and steam explosion treatment, primary activation treatment and secondary activation treatment are carried out, so that the obtained activated carbon has excellent strength performance and adsorption performance.
(2) In the preparation of the starch modification liquid, starch is adopted to react with deionized water to form starch milk, then the starch milk is adjusted with potassium permanganate and sodium hydroxide to improve the activity of the starch milk, bentonite is treated by sodium citrate and rare earth lanthanum chloride to improve the dispersibility and the activity of the bentonite on the one hand and enhance the ionic property of the bentonite on the other hand, so that the bentonite coated by the starch is conveniently dispersed with wood powder in the improvement of the microstructure of the bentonite, the porosity of the bentonite is improved, finally, the stability of the starch modification liquid is improved in the treatment of a graphene cross-linking agent, the wood powder is conveniently improved by the starch modification liquid, and the activity effect and the strength property of activated carbon are improved in the carbon preparation.
(3) According to the preparation method of the graphene cross-linking agent, graphene is mixed with melamine formaldehyde resin according to the weight ratio of 1:3, so that the cross-linking degree of the graphene to starch solution is improved through the improvement of the melamine formaldehyde resin, and the cross-linking degree of the product is further improved through the addition of the sodium maleate solution, so that the stability of the starch modification solution is improved.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1.
The production process of the wood activated carbon comprises the following steps:
the method comprises the following steps: soaking 100-mesh wood flour in a hydrochloric acid solution for 10min at 70 ℃, and then performing proton irradiation treatment with irradiation power of 200W and irradiation time of 10min to obtain active wood flour:
step two: sending the active wood powder into a starch modification liquid, performing ultrasonic dispersion with the ultrasonic power of 100W and the ultrasonic time of 10min, then adding sodium chloride accounting for 10% of the total weight of the wood powder, and then performing energization treatment to obtain modified wood powder after the treatment is finished;
step three: feeding the modified wood powder into a carbonization furnace for carbonization treatment, and obtaining a carbonized material after carbonization;
step four: sending the carbonized material into a steam blasting machine for blasting treatment, wherein the blasting pressure is 1MPa, the blasting time is 10min, and the activated carbon blasting material is obtained after blasting is finished;
step five: and (3) carrying out primary activation treatment and secondary activation treatment on the activated carbon blasting material, and obtaining the wood activated carbon after the treatment is finished.
The preparation method of the starch modifying solution of the embodiment comprises the following steps:
s1: feeding starch into deionized water to prepare starch milk with the mass fraction of 30%; then adding potassium permanganate accounting for 20 percent of the total mass of the starch, then raising the temperature of the starch milk to 40 ℃, then adding sodium hydroxide, and adjusting the pH of the solution to 10.0 to obtain an active starch solution;
s2: feeding bentonite into a sodium citrate solution with the mass fraction of 20% according to the weight ratio of 1:3, stirring at the stirring speed of 100r/min for 20min, adding rare earth lanthanum chloride accounting for 20% of the total mass of the bentonite after stirring, continuously stirring for 15min, and obtaining an ionic bentonite solution after stirring;
s3: mixing the active starch solution and the ionic bentonite solution according to the weight ratio of 2:1, stirring at the rotating speed of 500r/min for 30min, adding a graphene cross-linking agent accounting for 10% of the total amount of the ionic bentonite solution, continuing stirring for 10min, and stirring to obtain the starch modification solution.
The preparation method of the graphene cross-linking agent of the embodiment comprises the following steps: mixing graphene and melamine formaldehyde resin according to the weight ratio of 1:3, then adding the mixture into a sodium maleate solution with the mass fraction of 30%, stirring at the rotating speed of 300r/min for 20min, wherein the stirring temperature is 75 ℃, and finishing stirring to obtain the graphene cross-linking agent.
The preparation method of the melamine formaldehyde resin in the embodiment comprises the following steps: feeding formaldehyde into a sodium hydroxide solution according to the weight ratio of 1:2, then adding sodium tetraborate with the total amount of 20% of the formaldehyde, then adding melamine with the total amount of 70% of the formaldehyde, then raising the reaction temperature to 60 ℃, and reacting for 1h to obtain the melamine-formaldehyde resin.
The voltage of the energization process in this example was 100V, the processing time was 20min, and the frequency was 50 HZ.
The specific operation steps of the carbonization treatment in this embodiment are: heating to 400 deg.C, reacting for 10min, heating to 650 deg.C at 1 deg.C/min, reacting for 5min, and cooling to room temperature at 1 deg.C/min.
In the first-stage activation treatment of this example, infrared irradiation was performed for 10min at an irradiation power of 100W.
In the first-stage activation treatment of this example, activation was performed at 200 ℃ for 10min, and a sodium borate solution with a mass fraction of 20% was sprayed during the activation.
In the spraying of this example, the spraying was carried out at a rate of 1-5L/min for 3 min.
Example 2.
The production process of the wood activated carbon comprises the following steps:
the method comprises the following steps: soaking 200-mesh wood flour in a hydrochloric acid solution for 20min at the soaking temperature of 80 ℃, and then performing proton irradiation treatment with the irradiation power of 400W and the irradiation time of 20min to obtain active wood flour:
step two: sending the active wood powder into a starch modification liquid, performing ultrasonic dispersion, wherein the ultrasonic power is 500W, the ultrasonic time is 20min, then adding sodium chloride accounting for 20% of the total weight of the wood powder, and then performing energization treatment to obtain modified wood powder after the treatment is finished;
step three: feeding the modified wood powder into a carbonization furnace for carbonization treatment, and obtaining a carbonized material after carbonization;
step four: sending the carbonized material into a steam blasting machine for blasting treatment, wherein the blasting pressure is 5MPa, the blasting time is 20min, and the activated carbon blasting material is obtained after blasting is finished;
step five: and (3) carrying out primary activation treatment and secondary activation treatment on the activated carbon blasting material, and obtaining the wood activated carbon after the treatment is finished.
The preparation method of the starch modifying solution of the embodiment comprises the following steps:
s1: feeding starch into deionized water to prepare starch milk with the mass fraction of 50%; then adding potassium permanganate accounting for 20 percent of the total mass of the starch, then raising the temperature of the starch milk to 50 ℃, then adding sodium hydroxide, and adjusting the pH value of the solution to 11.0 to obtain an active starch solution;
s2: feeding bentonite into a sodium citrate solution with the mass fraction of 30% according to the weight ratio of 1:3, stirring at the stirring speed of 200r/min for 30min, adding rare earth lanthanum chloride accounting for 30% of the total mass of the bentonite after stirring, continuously stirring for 25min, and stirring to obtain an ionic bentonite solution;
s3: mixing the active starch solution and the ionic bentonite solution according to the weight ratio of 2:1, stirring at the rotating speed of 1000r/min for 40min, adding a graphene cross-linking agent accounting for 20% of the total amount of the ionic bentonite solution, continuing stirring for 20min, and stirring to obtain the starch modification solution.
The preparation method of the graphene cross-linking agent of the embodiment comprises the following steps: mixing graphene and melamine formaldehyde resin according to the weight ratio of 1:3, then adding the mixture into a sodium maleate solution with the mass fraction of 40%, stirring at the rotating speed of 400r/min for 30min, wherein the stirring temperature is 85 ℃, and finishing stirring to obtain the graphene cross-linking agent.
The preparation method of the melamine formaldehyde resin in the embodiment comprises the following steps: feeding formaldehyde into a sodium hydroxide solution according to the weight ratio of 1:2, then adding sodium tetraborate with the total amount of 30% of the formaldehyde, then adding melamine with the total amount of 80% of the formaldehyde, then raising the reaction temperature to 70 ℃, and reacting for 2 hours to obtain the melamine-formaldehyde resin.
The voltage of the energization process in this example was 200V, the processing time was 30min, and the frequency was 100 Hz.
The specific operation steps of the carbonization treatment in this embodiment are: heating to 500 deg.C, reacting for 20min, heating to 650 deg.C at 1 deg.C/min, reacting for 10min, and cooling to room temperature at 5 deg.C/min.
In the first-stage activation treatment of this example, infrared irradiation was performed for 20min at a power of 300W.
In the first-stage activation treatment of this embodiment, the activation is performed at 250 ℃ for 20min, and a sodium borate solution with a mass fraction of 20% is sprayed during the activation.
In the present example, the spraying speed of 5L/min was used for 3 min.
Example 3.
The production process of the wood activated carbon comprises the following steps:
the method comprises the following steps: soaking 150-mesh wood flour in a hydrochloric acid solution for 15min at 75 ℃, and then performing proton irradiation treatment with the irradiation power of 300W and the irradiation time of 15min to obtain active wood flour:
step two: sending the active wood powder into a starch modification liquid, performing ultrasonic dispersion, wherein the ultrasonic power is 300W, the ultrasonic time is 15min, then adding sodium chloride accounting for 15% of the total weight of the wood powder, and then performing energization treatment to obtain modified wood powder after the treatment is finished;
step three: feeding the modified wood powder into a carbonization furnace for carbonization treatment, and obtaining a carbonized material after carbonization;
step four: sending the carbonized material into a steam blasting machine for blasting treatment, wherein the blasting pressure is 3MPa, the blasting time is 15min, and the activated carbon blasting material is obtained after blasting is finished;
step five: and (3) carrying out primary activation treatment and secondary activation treatment on the activated carbon blasting material, and obtaining the wood activated carbon after the treatment is finished.
The preparation method of the starch modifying solution of the embodiment comprises the following steps:
s1: feeding starch into deionized water to prepare starch milk with the mass fraction of 40%; then adding potassium permanganate accounting for 20 percent of the total mass of the starch, then raising the temperature of the starch milk to 45 ℃, then adding sodium hydroxide, and adjusting the pH value of the solution to 10.5 to obtain an active starch solution;
s2: feeding bentonite into a sodium citrate solution with the mass fraction of 25% according to the weight ratio of 1:3, stirring at the stirring speed of 150r/min for 25min, adding rare earth lanthanum chloride accounting for 25% of the total amount of the bentonite after stirring, continuously stirring for 20min, and obtaining an ionic bentonite solution after stirring;
s3: mixing the active starch solution and the ionic bentonite solution according to the weight ratio of 2:1, stirring at the rotating speed of 750r/min for 35min, adding a graphene cross-linking agent accounting for 15% of the total amount of the ionic bentonite solution, continuing stirring for 15min, and stirring to obtain the starch modification solution.
The preparation method of the graphene cross-linking agent of the embodiment comprises the following steps: mixing graphene and melamine formaldehyde resin according to the weight ratio of 1:3, then adding the mixture into a sodium maleate solution with the mass fraction of 35%, stirring at the rotating speed of 350r/min for 25min, wherein the stirring temperature is 80 ℃, and finishing stirring to obtain the graphene cross-linking agent.
The preparation method of the melamine formaldehyde resin in the embodiment comprises the following steps: feeding formaldehyde into a sodium hydroxide solution according to the weight ratio of 1:2, then adding 25% of sodium tetraborate of the total amount of formaldehyde, then adding 75% of melamine of the formaldehyde, then raising the reaction temperature to 65 ℃, and reacting for 1.5 hours to obtain the melamine-formaldehyde resin.
The voltage of the electrification treatment in this example was 150V, the treatment time was 25min, and the frequency was 75 Hz.
The specific operation steps of the carbonization treatment in this embodiment are: heating to 450 deg.C, reacting for 15min, heating to 650 deg.C at 1 deg.C/min, reacting for 7.5min, and cooling to room temperature at 3 deg.C/min.
In the first-stage activation treatment of this example, infrared irradiation was performed for 15min at a power of 150W.
In the first-stage activation treatment of this example, the activation is performed at 225 ℃ for 15min, and a sodium borate solution with a mass fraction of 20% is sprayed during the activation.
In the spraying of the present embodiment, a rate of 3L/min is used for 3 min.
Comparative example 1.
The only difference from example 3 is that no starch modifying solution treatment was used.
Comparative example 2.
The only difference from example 3 is that the char was not blasted.
The performance test was carried out according to the GB/T4296.8-1999 standard:
the properties of examples 1-3 and comparative examples 1-2 were tested as follows:
| group of | Strength (%) | Iodine value (mg/g) |
| Example 1 | 98.9 | 1865 |
| Example 2 | 98.8 | 1876 |
| Example 3 | 99.1 | 1889 |
| Comparative example 1 | 92.1 | 1432 |
| Comparative example 2 | 94.5 | 1565 |
As can be seen from examples 1-3 and comparative examples 1-2, the activated carbon prepared by the present invention has excellent strength and adsorption performance.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
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 (10)
1. The production process of the wood activated carbon is characterized by comprising the following steps of:
the method comprises the following steps: soaking 100-mesh 200-mesh wood powder in a hydrochloric acid solution for 10-20min at 70-80 ℃, and then performing proton irradiation treatment with irradiation power of 200-mesh 400W for 10-20min to obtain active wood powder:
step two: sending the active wood powder into starch modification liquid, performing ultrasonic dispersion with ultrasonic power of 100-500W for 10-20min, then adding sodium chloride accounting for 10-20% of the total weight of the wood powder, and then performing electrification treatment to obtain modified wood powder after the treatment is finished;
step three: feeding the modified wood powder into a carbonization furnace for carbonization treatment, and obtaining a carbonized material after carbonization;
step four: sending the carbonized material into a steam blasting machine for blasting treatment, wherein the blasting pressure is 1-5MPa, the blasting time is 10-20min, and after blasting is finished, obtaining an active carbon blasting material;
step five: and (3) carrying out primary activation treatment and secondary activation treatment on the activated carbon blasting material, and obtaining the wood activated carbon after the treatment is finished.
2. A process for the production of wood-based activated carbon as claimed in claim 1, wherein the starch modifying solution is prepared by:
s1: feeding starch into deionized water to prepare starch milk with the mass fraction of 30-50%; then adding potassium permanganate accounting for 20 percent of the total mass of the starch, then raising the temperature of the starch milk to 40-50 ℃, then adding sodium hydroxide, and adjusting the pH of the solution to 10.0-11.0 to obtain an active starch solution;
s2: feeding bentonite into a sodium citrate solution with the mass fraction of 20-30% according to the weight ratio of 1:3, stirring at the stirring speed of 100-200r/min for 20-30min, then adding rare earth lanthanum chloride accounting for 20-30% of the total weight of the bentonite, continuing stirring for 15-25min, and obtaining an ionic bentonite solution after stirring;
s3: mixing the active starch solution and the ionic bentonite solution according to the weight ratio of 2:1, stirring at the rotating speed of 500-1000r/min for 30-40min, then adding the graphene cross-linking agent accounting for 10-20% of the total amount of the ionic bentonite solution, continuing stirring for 10-20min, and obtaining the starch modification solution after stirring.
3. A process for the production of wood-based activated carbon as claimed in claim 2, wherein the graphene cross-linking agent is prepared by: mixing graphene and melamine formaldehyde resin according to the weight ratio of 1:3, then adding the mixture into a sodium maleate solution with the mass fraction of 30-40%, stirring the mixture for 20-30min at the rotating speed of 300-400r/min, wherein the stirring temperature is 75-85 ℃, and after the stirring is finished, obtaining the graphene cross-linking agent.
4. A process for the production of wood-based activated carbon as claimed in claim 3, wherein the melamine formaldehyde resin is prepared by a method comprising: feeding formaldehyde into a sodium hydroxide solution according to the weight ratio of 1:2, then adding sodium tetraborate with the total formaldehyde amount of 20-30%, then adding melamine with the total formaldehyde amount of 70-80%, then heating the reaction temperature to 60-70 ℃, and reacting for 1-2h to obtain the melamine-formaldehyde resin.
5. The process for producing wood activated carbon as defined in claim 1, wherein the voltage of the electrical treatment is 100-200V, the treatment time is 20-30min, and the frequency is 50-100 HZ.
6. A process for the production of wood activated carbon as in claim 5, wherein the voltage of the electrical treatment is 150V, the treatment time is 25min and the frequency is 75 HZ.
7. A process for the production of wood-based activated carbon as in claim 1, wherein the carbonization treatment comprises the specific steps of: the temperature is increased to 400 ℃ and 500 ℃, the reaction is carried out for 10-20min, then the temperature is increased to 650 ℃ at the speed of 1 ℃/min, the reaction is carried out for 5-10min, and finally the temperature is reduced to the room temperature at the speed of 1-5 ℃/min.
8. The process for producing woody activated carbon as set forth in claim 1, wherein said primary activation treatment employs infrared irradiation for 10-20min at an irradiation power of 100-300W.
9. A process for the production of wood activated carbon as in claim 1, wherein the primary activation treatment is carried out at a temperature of 200-250 ℃ for 10-20min, and during activation, sodium borate solution with a mass fraction of 20% is sprayed.
10. A process for the production of wood activated carbon as in claim 9, wherein the spraying is at a rate of 1-5L/min for 3 min.
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