CN112705158A - Preparation method of high-load modified silica gel dehumidification rotary core - Google Patents
Preparation method of high-load modified silica gel dehumidification rotary core Download PDFInfo
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- CN112705158A CN112705158A CN202011524585.9A CN202011524585A CN112705158A CN 112705158 A CN112705158 A CN 112705158A CN 202011524585 A CN202011524585 A CN 202011524585A CN 112705158 A CN112705158 A CN 112705158A
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000007791 dehumidification Methods 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 37
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000007598 dipping method Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 150000003751 zinc Chemical class 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 7
- 230000007935 neutral effect Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000012266 salt solution Substances 0.000 claims abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical group [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims description 8
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 5
- 229960001763 zinc sulfate Drugs 0.000 claims description 5
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 16
- 238000005470 impregnation Methods 0.000 abstract description 10
- 238000011068 loading method Methods 0.000 abstract description 8
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 2
- 238000004886 process control Methods 0.000 abstract description 2
- 239000000741 silica gel Substances 0.000 description 16
- 229910002027 silica gel Inorganic materials 0.000 description 16
- 238000002791 soaking Methods 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 9
- 239000003365 glass fiber Substances 0.000 description 8
- 239000011148 porous material Substances 0.000 description 7
- 238000005507 spraying Methods 0.000 description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 239000003463 adsorbent Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 238000000635 electron micrograph Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 229910018557 Si O Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000000547 structure data Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
-
- 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
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/024—Compounds of Zn, Cd, Hg
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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
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3214—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the method for obtaining this coating or impregnating
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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
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
- B01J20/3234—Inorganic material layers
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- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a preparation method of a high-load modified silica gel dehumidification rotary core, and belongs to the field of preparation of dehumidification materials. The method comprises the following steps: (1) drying and blowing the sample block of the dehumidifying rotary core, and then blowing the sample block by hot air after dipping in water glass; (2) repeatedly and uniformly sprinkling the residual water glass in the step (1) on the sample block obtained in the step (1), and then blowing by hot air; (3) under the condition of water bath, dipping the sample block obtained in the step (2) in a zinc salt solution, and adjusting the pH value back to the initial pH value by using acid in the reaction process; (4) and (4) washing the sample block obtained in the step (3) with water to be neutral, and roasting and drying to obtain the material. The method obtains the modified silica gel dehumidification rotary core with large effective loading capacity, good adsorption performance and high mechanical strength through twice impregnation and process control of metal doping.
Description
Technical Field
The invention relates to the field of preparation of dehumidifying materials, in particular to a preparation method of a high-load modified silica gel dehumidifying rotary core.
Background
The rotary wheel dehumidification system has the advantages of energy conservation, large dehumidification amount, high efficiency, capability of continuously providing low dew point dry air and the like, and is widely applied. In the system, the dehumidification rotary core is the heart of the system, and the performance of the adsorbent in the dehumidification rotary core and the content of the adsorbent are the key factors for determining the dehumidification performance of the system.
Common adsorbents include lithium chloride, molecular sieves, silica gel, metal ion doped silica gel, and the like. The lithium chloride has large adsorption quantity, good dehumidification effect and low regeneration energy consumption, but the solution is easy to drift and has large corrosivity to peripheral equipment. The molecular sieve has good adsorption performance under low humidity and high temperature conditions, but has small adsorption capacity under conventional conditions and high regeneration energy consumption. The silica gel has good stability in the adsorption process and is easy to clean, but the adsorption performance is poor, and the dehumidification rotary core containing the silica gel is easily melted, collapsed and blocked in a pore channel and the like when being in a regeneration environment of 140 ℃ for a long time, so that the adsorption efficiency is reduced.
Silica gel must be modified in order to improve its adsorption properties, heat resistance and mechanical strength. The existing silica gel modification method is divided into two aspects of preparing a composite adsorbent based on the traditional silica gel and doping other metal elements in the silica gel. Although the adsorption performance, the thermal stability and the mechanical strength of the modified silica gel are improved to a certain degree, the loading capacity of the modified silica gel has certain limitation due to the particularity of the initial core rotation, and the adsorption performance and the strength are further influenced.
In view of this, the present application is specifically made.
Disclosure of Invention
The invention provides a preparation method of a high-loading modified silica gel dehumidification rotary core, which is characterized in that the modified silica gel dehumidification rotary core with large effective loading, good adsorption performance and high mechanical strength is obtained through twice impregnation and metal doping process control.
The specific technical scheme of the invention is as follows:
a preparation method of a high-load modified silica gel dehumidification rotary core comprises the following steps:
(1) drying and blowing the sample block of the dehumidifying rotary core, and then blowing the sample block by hot air after dipping in water glass;
(2) repeatedly and uniformly sprinkling the residual water glass in the step (1) onto the sample block obtained in the step (1), and then blowing by hot air, wherein the hot air blowing process aims at preventing the water glass from blocking holes, and the sprinkling mode is adopted in the step, so that the water glass is deposited on the glass fiber surface of the sample block treated in the step (1), the aperture of the sample block is reduced, bubbles in the holes are not easy to discharge if an impregnation means is used, the water glass cannot enter the sample block, the problem can be avoided if the sprinkling mode is adopted, and the experimental verification is also the same; in addition, the recycling of the residual water glass can reduce part of the cost.
(3) Under the condition of water bath, dipping the sample block obtained in the step (2) in a zinc salt solution, and adjusting the pH value back to the initial pH value by using acid in the reaction process;
(4) and (4) washing the sample block obtained in the step (3) with water to be neutral, and roasting and drying to obtain the material.
Further, the concentration of the water glass in the step (1) is 25-35%. Preferably, the concentration of the water glass in the step (1) is 30%.
Further, in the step (1), the drying is carried out at the temperature of 100-120 ℃ for 20-30min, and the blowing is carried out at the wind speed of 0.5-2m/s for 10-15min, wherein the wind speed is preferably 1 m/s.
The dipping is preferably repeated pulling dipping for 10-15 min.
The hot air blowing is carried out at the temperature of 30-40 ℃ for 0.5-2h with the hot air blowing of 0.5-2m/s, the air speed is preferably 1m/s, and the hot air blowing time is preferably 1 h.
Further, in the step (2), the showering time is 5-20min, and the hot air blowing is performed for 0.5-2h at 30-40 ℃ by using hot air of 0.5-2 m/s. The wind speed is preferably 1m/s, and the time for hot air blowing is preferably 2 h.
Further, in the step (3), the temperature of the water bath is 55-65 ℃, and preferably, the temperature of the water bath is 60 ℃.
Further, in the step (3), the zinc salt is zinc nitrate or zinc sulfate, the concentration of the zinc salt is 5% -15%, the deposition amount of zinc is moderate when the concentration of the solution is below 15%, the pH value is 1.0-1.2, the deposition is uneven due to too high concentration, and waste is easily caused.
Preferably, in the step (3), the acid is preferably concentrated sulfuric acid, the initial pH value is 1.0-1.2, the use amount of concentrated sulfuric acid in the process of adjusting the pH is small, the pH is easy to control, the influence on the solution concentration is negligible, and the generated silica gel is uniform and stable.
Preferably, in the step (3), the callback is performed once every 5min of the reaction, and is particularly suitable for using concentrated sulfuric acid to callback, so that the pH value is in a constant range, and the sodium silicate can stably, uniformly and continuously react to generate silica gel to be attached to the surface of the sample block.
Further, in the step (4), the baking and drying are carried out at 100-180 ℃. Preferably, the water used for the water washing is deionized water.
Compared with the prior art, the invention has the following advantages:
(1) the two-time dipping method improves the loading capacity of the water glass, and further improves the loading capacity of the modified silica gel on the dehumidifying rotary core block.
(2) Compared with the adsorption rate of 20% of the common core-rotating sample block, the adsorption rate of the sample block can reach about 30%, and the water absorption rate and the saturated adsorption capacity are greatly improved.
(3) The mechanical strength of the sample block is further improved by increasing the silica gel loading amount.
(4) The optimum desorption temperature of the sample block is low and is about 60 ℃.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention.
FIG. 1 is a graph showing the relationship between the number of impregnations and the mass in the stage of loading water glass in example 1 and comparative examples 1 to 3;
FIG. 2 is a graph showing adsorption curves at 75% humidity for samples obtained in examples 1 to 3 and comparative example 4 of the present invention;
FIG. 3 is an electron micrograph of a 10 μm scale of a sample prepared in example 1;
FIG. 4 is an electron micrograph of a 20 μm scale of a sample prepared in example 1.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to specific examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
A preparation method of a high-load modified silica gel dehumidification rotary core comprises the following steps:
s1: and drying and blowing the sample blocks of the dehumidifying rotary core, and then blowing the sample blocks by hot air after dipping in water glass. The concentration of the water glass is 25-35%. In a preferred embodiment, the concentration of the water glass is 30%.
The drying is carried out at the temperature of 100-120 ℃ for 20-30min, and the blowing is carried out at the wind speed of 0.5-2m/s for 10-15min, wherein in a preferred embodiment, the wind speed is 1 m/s.
In a preferred embodiment, the dipping is repeated pulling dipping for 10-15 min.
The hot air blowing is carried out at the temperature of 30-40 ℃ for 0.5-2h by using hot air of 0.5-2m/s, in a preferred embodiment, the air speed is 1m/s, and the hot air blowing time is 1 h.
S2: and (3) repeatedly and uniformly spraying the residual water glass in the step (1) onto the sample block obtained in the step (1), and then blowing by hot air, wherein the hot air blowing process aims at preventing the water glass from blocking holes.
The showering time is 5-20min, and the hot air blowing is performed for 0.5-2h at 30-40 ℃ by using hot air of 0.5-2 m/s. In the preferred embodiment, the wind speed is 1m/s and the hot air blowing time is 2 h.
S3: and (3) under a water bath, dipping the sample block obtained in the step (2) in a zinc salt solution, and adjusting the pH value back to the initial pH value by using acid in the reaction process.
The water bath temperature is 55-65 deg.C, and in a preferred embodiment, the water bath temperature is 60 deg.C.
The zinc salt is zinc nitrate or zinc sulfate, the concentration of the zinc salt is 5% -15%, the deposition amount of zinc is moderate when the concentration of the solution is below 15%, and the pH value is 1.0-1.2.
The acid is concentrated sulfuric acid, and the initial pH value is 1.0-1.2.
In a preferred embodiment, the callback is performed every 5min of reaction.
S4: and (4) washing the sample block obtained in the step (3) with water to be neutral, and roasting and drying to obtain the material. In a preferred embodiment, the calcination drying is carried out at 100-180 ℃.
Example 1
S1: drying the dehumidifying core-rotating glass fiber sample block at 100 ℃ for 20min, blowing at a wind speed of 1m/s for 10min, then soaking in 25% water glass at room temperature, repeatedly lifting and soaking for 10min, and blowing with hot air at 30 ℃ and 1m/s for 1 h;
s2: and (4) spraying the residual water glass obtained in the step (S1) onto the sample block obtained in the step (S1), repeatedly and uniformly spraying for 10min, and blowing for 2h by hot air at 30 ℃ and 1 m/S.
S3: selecting zinc sulfate to prepare a 10% aqueous solution, soaking the sample block obtained in the step S2 in the solution in a water bath at 60 ℃, adjusting the pH back to 1.0 by using concentrated sulfuric acid in the reaction process, and soaking for 1h, wherein the adjustment back is carried out once every 5min of reaction;
s4: and (4) washing the sample block reacted in the step S3 to be neutral by using deionized water, and roasting and drying at 100 ℃ to obtain the high-load-rate dehumidifying and core-rotating sample block.
The electron microscope photos of the obtained sample are shown in fig. 3 and 4, and the photos clearly show that the glass fibers in the sample are used as a support, a small part of the modified silica gel is attached to the glass fibers, and the majority of the modified silica gel is present in the space of the glass fibers, so that the strength of the sample block is improved to a certain extent by the agglomerated silica gel.
Example 2
S1: drying the dehumidifying core-rotating glass fiber sample block at 110 ℃ for 20min, blowing at a wind speed of 1m/s for 15min, then soaking in 35% water glass at room temperature, repeatedly pulling and soaking for 15min, and blowing with hot air of 0.5m/s at 40 ℃ for 2 h;
s2: and (4) spraying the residual water glass obtained in the step (S1) onto the sample block obtained in the step (S1), repeatedly and uniformly spraying for 15min, and blowing for 2h by hot air at 40 ℃ and 0.5 m/S.
S3: preparing 15% aqueous solution from zinc sulfate, soaking the sample block obtained in the step S2 in the solution at 65 ℃ in a water bath, adjusting the pH back to 1.2 by using concentrated sulfuric acid in the reaction process, and soaking for 1h, wherein the adjustment back is carried out once every 5min of reaction;
s4: and (4) washing the sample block reacted in the step S3 to be neutral by using deionized water, and roasting and drying at 120 ℃ to obtain the high-load-rate dehumidifying and core-rotating sample block.
Example 3
S1: drying the dehumidifying core-rotating glass fiber sample block at 120 ℃ for 20min, blowing at a wind speed of 1m/s for 10min, then soaking in 30% water glass at room temperature, repeatedly lifting and soaking for 10min, and blowing with hot air at 30 ℃ and 1m/s for 1 h;
s2: and (4) spraying the residual water glass obtained in the step (S1) onto the sample block obtained in the step (S1), repeatedly and uniformly spraying for 20min, and blowing for 2h by hot air at 30 ℃ and 1 m/S.
S3: preparing a 20% aqueous solution from zinc nitrate, soaking the sample block obtained in the step S2 in the solution in a water bath at 60 ℃, adjusting the pH back to 1.0 by using concentrated sulfuric acid in the reaction process, and soaking for 1h, wherein the adjustment back is carried out once every 5min of reaction;
s4: and (4) washing the sample block reacted in the step S3 to be neutral by using deionized water, and roasting and drying at 150 ℃ to obtain the high-load-rate dehumidifying and core-rotating sample block.
Comparative example 1
The difference from embodiment 1 is that step S2 is not performed, and the sample block obtained in step S1 is directly transferred to step S3.
Comparative example 2
The difference from example 1 is that the impregnation is performed again between step S2 and step S3, and the impregnation method is the same as step S2.
Comparative example 3
The difference from example 1 is that the impregnation was performed two more times between step S2 and step S3, and the impregnation method was the same as step S2.
Comparative example 4
The difference from example 1 is that steps S1 and S2 are not performed, and the process proceeds to step S3 directly as an unmodified dehumidified core-spun glass fiber sample.
TABLE 1 pore Structure data for comparative example 4 and examples 1-3
It can be seen that the silica gels of the present invention have a larger specific surface area than the silica gel of comparative example 4, and the average pore size is reduced. First, this is because zinc substitutes for a part of Si in Si-O bonds to form Si-O-Zn, and zinc atoms are deposited on the surface of the silica gel to increase the specific surface area. In addition, zinc atoms are also deposited in the silica gel pore channels, thereby reducing the average pore size.
In addition, as shown in fig. 1, as the number of times of impregnation is increased, the quality after drying is correspondingly improved to a certain extent, but the pore blocking becomes serious at the same time, wherein the secondary impregnation load is high, the pore blocking rate is low, and the optimal selection is realized.
As shown in FIG. 2, the adsorption capacity of the samples obtained in examples 1 to 3 was improved more than that of the silica gel in comparative example 4.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (10)
1. A preparation method of a high-load modified silica gel dehumidification rotary core is characterized by comprising the following steps:
(1) drying and blowing the sample block of the dehumidifying rotary core, and then blowing the sample block by hot air after dipping in water glass;
(2) repeatedly and uniformly sprinkling the residual water glass in the step (1) on the sample block obtained in the step (1), and then blowing by hot air;
(3) under the condition of water bath, dipping the sample block obtained in the step (2) in a zinc salt solution, and adjusting the pH value back to the initial pH value by using acid in the reaction process;
(4) and (4) washing the sample block obtained in the step (3) with water to be neutral, and roasting and drying to obtain the material.
2. The method for preparing the high-load modified silica gel dehumidification rotary core according to claim 1, wherein the concentration of the water glass in the step (1) is 25-35%.
3. The method for preparing the high-load modified silica gel dehumidification rotary core according to claim 2, wherein the concentration of the water glass in the step (1) is 30%.
4. The method for preparing the high-load modified silica gel dehumidifying rotary core as claimed in claim 1, wherein in the step (1), the drying is performed at 100-120 ℃ for 20-30min, the blowing is performed at a wind speed of 0.5-2m/s for 10-15min, the dipping is performed by repeatedly lifting and dipping for 10-15min, and the hot air blowing is performed at 30-40 ℃ for 0.5-2m/s for 0.5-2 h.
5. The method for preparing the high-load modified silica gel dehumidification rotary core according to claim 1, wherein in the step (2), the showering time is 5-20min, and the hot air blowing is performed at 30-40 ℃ for 0.5-2m/s for 0.5-2 h.
6. The method for preparing the high-load modified silica gel dehumidification rotary core according to claim 1, wherein in the step (3), the water bath temperature is 55-65 ℃;
preferably, the water bath temperature is 60 ℃.
7. The method for preparing the high-load modified silica gel dehumidification rotary core according to claim 1, wherein in the step (3), the zinc salt is zinc nitrate or zinc sulfate, and the concentration of the zinc salt is 5-15%.
8. The method for preparing the high-load modified silica gel dehumidification rotary core according to claim 1, wherein in the step (3), the acid is concentrated sulfuric acid, and the initial pH value is 1.0-1.2.
9. The method for preparing a high-load modified silica gel dehumidifying rotor core as claimed in claim 1, wherein in the step (3), the callback is performed every 5 min.
10. The method for preparing the dehumidification and rotation core of high-load modified silica gel as claimed in claim 1, wherein the calcination and drying are performed at 100-180 ℃ in step (4).
Priority Applications (1)
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