CN111203176B - Hydrophobic molecular sieve based porous foam adsorbent and preparation method and application thereof - Google Patents
Hydrophobic molecular sieve based porous foam adsorbent and preparation method and application thereof Download PDFInfo
- Publication number
- CN111203176B CN111203176B CN202010121362.1A CN202010121362A CN111203176B CN 111203176 B CN111203176 B CN 111203176B CN 202010121362 A CN202010121362 A CN 202010121362A CN 111203176 B CN111203176 B CN 111203176B
- Authority
- CN
- China
- Prior art keywords
- molecular sieve
- porous foam
- based porous
- mass
- hydrophobic molecular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—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
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
-
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28011—Other properties, e.g. density, crush strength
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28042—Shaped bodies; Monolithic structures
- B01J20/28045—Honeycomb or cellular structures; Solid foams or sponges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to the field of VOCs waste gas treatment, and particularly relates to a hydrophobic molecular sieve based porous foam adsorbent and a preparation method and application thereof. The hydrophobic molecular sieve based porous foam adsorbent is prepared by soaking polyurethane sponge in composite slurry containing a molecular sieve; the composite slurry contains an inorganic binder, the inorganic binder is one of silica sol, aluminum sol or aluminum dihydrogen phosphate, and the mass ratio of the molecular sieve to the inorganic binder is 100:30 to 80. The hydrophobic molecular sieve based porous foam adsorbent has the advantages of small specific gravity, small bulk density, high molecular sieve utilization rate, uniform pore distribution and the like; and the prepared porous foam adsorbent has controllable size and is convenient to apply. Meanwhile, the method is simple and convenient to operate, low in cost and friendly to environment.
Description
Technical Field
The invention relates to the field of VOCs waste gas treatment, and particularly relates to a hydrophobic molecular sieve based porous foam adsorbent and a preparation method and application thereof.
Background
VOCs are organic volatile compounds, are discharged in large quantities in the production process of industries such as petrochemical industry, pharmacy, printing, spraying and the like, pollute air and bring harm to the health of people. Adsorption is a common technique used in the industry for the treatment of VOCs, with solid adsorbents being the most common. At present, the common activated carbon adsorbent is inflammable in the adsorption process, difficult to desorb and regenerate and difficult to adapt to the treatment of complicated and variable industrial waste gas. The ZSM-5 zeolite molecular sieve with high silica-alumina ratio has the advantages of good hydrophobicity, high hydrothermal stability, high temperature resistance and unique pore structure, and is often used as an adsorbent for treating VOCs. However, the molecular sieve powder cannot be directly applied to industrial waste gas treatment, and is often processed into particles, thin strips, honeycombs and the like.
The porous foam material is a porous product with a three-dimensional skeleton structure, the shape of the porous foam material is similar to that of a foam sponge, the porosity can reach 70-90 percent, and the specific gravity is 0.3-0.6 g/m 3 In between. At present, the foam ceramic material is available in the market, is mainly used for the aspects of water pollution prevention and control, antibiosis and disinfection, high-temperature flue gas purification, sound absorption and noise reduction and the like, and is rarely applied to the comprehensive treatment of industrial VOCs. The shapes of the formed molecular sieve powder are usually columnar, spherical and honeycomb, but the molecular sieve powder has the problems of high specific gravity, high desorption energy consumption, high bulk density, low molecular sieve utilization rate and the like in the application process. For example: in CN105618159A, the formed molecular sieve-based honeycomb body has the problems of large bulk density, low molecular sieve utilization rate and the like, and in addition, the preparation process also has the defects of long production period, complex operation and the like. CN106904993A discloses a porous ceramic prepared by using starch, coal powder and the like as pore-forming agents, which has the defect that toxic and harmful gases are easily generated in the sintering process.
Therefore, further improvements and improvements in the existing manufacturing techniques are needed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a hydrophobic molecular sieve based porous foam adsorbent with small specific gravity, small bulk density, low energy consumption and high molecular sieve utilization rate, and a preparation method and application thereof.
In order to realize the technical purpose, the invention firstly provides a hydrophobic molecular sieve based porous foam adsorbent, which is prepared by soaking polyurethane sponge in composite slurry containing a molecular sieve;
the composite slurry contains an inorganic binder, the inorganic binder is one of silica sol, aluminum sol or aluminum dihydrogen phosphate, and the mass ratio of the molecular sieve to the inorganic binder is 100:30 to 80.
Preferably, the silica sol is alkaline, the pH value is 9-10.5, the average particle size is 10-30 nm, and the mass fraction is 30-50%; the aluminum sol is acidic, the pH value is 3.5-4, the average particle size is 20-30 nm, and the mass fraction is 20-35%; the aluminum dihydrogen phosphate is acidic, the pH value is 1.4-2, and the mass fraction is 30-50%.
In some preferred schemes, the composite slurry also contains one or more of rheological agent, dispersant, defoaming agent and surfactant; the preferred mass ratio of each component is as follows: molecular sieve: rheological agent: dispersing agent: defoaming agent: surfactant =100:2 to 10: 2-6: 5 to 10:10 to 50.
Preferably, the rheological agent is one or more of hydroxymethyl cellulose, kaolin and white carbon black; more preferably, the viscosity of the hydroxymethylcellulose is 7000 to 200000cPs;
the dispersant is one or more of polyvinylamine and polyacrylamide;
the defoaming agent is glycerol or one or more selected from organic silicon;
the surfactant is a low foaming nonionic surfactant (such as surfynol TG).
As a preferable scheme of the invention, the composite slurry consists of the following components in percentage by mass: molecular sieve: inorganic binder: rheological agent: dispersing agent: defoaming agent: surfactant (B): deionized water =100:30 to 80:2 to 10: 2-6: 5 to 10:10 to 50.
Preferably, the molecular sieve is ZSM-5 and/or SBA-15.
Further preferably SiO in the ZSM-5 2 With Al 2 O 3 Has a ratio of more than 300, and is statically suckedThe water rate is lower than 2 percent, and the product is a hydrophobic molecular sieve.
Preferably, after the impregnation, the method further comprises: the obtained wet base sample I is dried, and then the dried sample is put into water glass for dipping, so that the mechanical strength of the product can be improved. Preferably, the modulus of the water glass is 2.3-3, and the mass fraction is 26-30%.
The invention further provides a preparation method of the hydrophobic molecular sieve based porous foam adsorbent, which comprises the following steps:
(1) Weighing raw materials according to a formula and preparing the composite slurry;
(2) Soaking the polyurethane sponge in a sodium hydroxide aqueous solution for pretreatment;
(3) Dipping the pretreated polyurethane sponge in the composite slurry, and drying the obtained wet base sample I to obtain a semi-finished product I;
(4) Dipping the semi-finished product I in the water glass, and drying the obtained wet base sample II to obtain a semi-finished product II;
(5) And roasting the semi-finished product II to obtain the hydrophobic molecular sieve based porous foam adsorbent.
In order to improve the mixing effect, in the step (1), the solid raw materials are mixed to obtain mixed dry powder, and then the mixed dry powder and the liquid raw materials are mixed to obtain the composite slurry. In order to improve the composite effect of the composite slurry and the polyurethane sponge, the composite slurry may be subjected to operations such as mechanical ball milling to ensure uniform particle size, which is not further limited herein.
Preferably, the roasting temperature in the step (5) is set as follows: heating to 280-320 ℃ at the speed of 1.5-2 ℃/min, preserving heat for 1-2 h, then heating to 550-650 ℃ at the speed of 3-5 ℃/min, preserving heat for 4-6 h, and being beneficial to improving the strength of the product.
Preferably, the mass fraction of the sodium hydroxide aqueous solution in the step (2) is 10-20%, the soaking temperature is 35-80 ℃, and the soaking time is 6-10 h;
preferably, the drying temperature in the step (3) is 40-80 ℃, and the drying time is 4-6 h;
preferably, the dipping time in the step (4) is 10-20 min, the drying temperature is 60-100 ℃, and the drying time is 4-6 h.
The skilled person will routinely understand that the above schemes can be combined to give preferred embodiments of the invention.
The invention further provides application of the hydrophobic molecular sieve based porous foam adsorbent in treatment of VOCs.
The invention has the following beneficial effects:
(1) The hydrophobic molecular sieve based porous foam adsorbent has the advantages of small specific gravity, small bulk density, high molecular sieve utilization rate, uniform pore distribution and the like; and the prepared porous foam adsorbent has controllable size and is convenient to apply. SiO in adsorbent 2 The content can reach 10-30 wt%, and the content of the active molecular sieve can reach 70-90 wt%.
(2) The invention adopts water glass soaking treatment, thus improving the mechanical strength of the product.
(3) The invention does not need to add MgO and other sintering aids, the sintering temperature is lower than 650 ℃, the operation is simple and convenient, and the cost is lower. In addition, because no organic pore-forming agent is added, a large amount of harmful gas is not generated in the sintering process, and the method is environment-friendly.
Drawings
FIG. 1 is a diagram of a calcined substance prepared from a hydrophobic molecular sieve-based porous foam adsorbent.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
A multi-hydrophobic molecular sieve based porous foam adsorbent is prepared by the following specific steps:
step one, mixing 100 parts by mass of ZSM-5 molecular sieve raw powder and 3 parts by mass of polyacrylamide to obtain mixed dry powder A, adding 3 parts by mass of hydroxymethyl cellulose, 2 parts by mass of glycerol, 6 parts by mass of surfynol TG, 50 parts by mass of silica sol and 40 parts by mass of deionized water into the mixed dry powder A, and mechanically ball-milling for 20min to obtain slurry B.
And step two, preparing a NaOH aqueous solution with the mass fraction of 15%, soaking polyurethane foam sponge in the solution, heating and hydrolyzing for 7 hours under the condition of a water bath at 40 ℃, cleaning and airing for later use to obtain the pretreated foam sponge.
And step three, soaking the pretreated polyurethane sponge in the slurry B at normal temperature, blowing redundant slurry on the surface of the polyurethane sponge by using compressed air after soaking, and placing the polyurethane sponge in an oven at 60 ℃ for drying and shaping for 5 hours to obtain a semi-finished product I.
And step four, soaking the semi-finished product I in a water glass solution at normal temperature for 15 minutes, blowing redundant solution on the surface of the semi-finished product I by using compressed air, drying and shaping the semi-finished product I by using an 80 ℃ drying oven for 4 hours, placing the semi-finished product I in a muffle furnace for high-temperature roasting, heating to 300 ℃ at the speed of 2 ℃/min, preserving heat for 2 hours, heating to 550 ℃ at the speed of 3 ℃/min, and preserving heat for 6 hours. And naturally cooling to room temperature along with the furnace temperature to obtain a hydrophobic molecular sieve based porous foam adsorbent sample (see figure 1).
Example 2
The preparation method of the multi-hydrophobic molecular sieve based porous foam adsorbent is the same as that of the example 1 except for the step one.
Step one, mixing 100 parts by mass of ZSM-5 molecular sieve raw powder and 6 parts by mass of polyacrylamide to obtain mixed dry powder A, adding 3 parts by mass of hydroxymethyl cellulose, 2 parts by mass of glycerol, 6 parts by mass of surfynol TG, 50 parts by mass of silica sol and 30 parts by mass of deionized water into the mixed dry powder A, and mechanically ball-milling for 20min to obtain slurry B.
Example 3
A multi-hydrophobic molecular sieve based porous foam adsorbent is prepared by the following specific steps:
step one, mixing 100 parts by mass of ZSM-5 molecular sieve raw powder and 3 parts by mass of polyacrylamide to obtain mixed dry powder A, adding 3 parts by mass of hydroxymethyl cellulose, 2 parts by mass of glycerol, 7 parts by mass of surfynol TG, 50 parts by mass of alumina sol and 30 parts by mass of deionized water into the mixed dry powder A, and mechanically ball-milling for 20min to obtain slurry B.
And step two, preparing a NaOH aqueous solution with the mass fraction of 15%, soaking polyurethane foam sponge in the solution, heating and hydrolyzing for 8 hours under the condition of a water bath at 40 ℃, cleaning and airing for later use to obtain the pretreated foam sponge.
And step three, soaking the pretreated polyurethane sponge in the slurry B at normal temperature, blowing redundant slurry on the surface of the polyurethane sponge by using compressed air after soaking, and placing the polyurethane sponge in an oven at 60 ℃ for drying and shaping for 5 hours to obtain a semi-finished product I.
And step four, soaking the semi-finished product I in a water glass solution at normal temperature for 15 minutes, blowing redundant solution on the surface of the semi-finished product I by using compressed air, drying and shaping the semi-finished product I in an oven at 80 ℃ for 4 hours, placing the semi-finished product I in a muffle furnace for high-temperature roasting, heating to 300 ℃ at the speed of 2 ℃/min, preserving heat for 2 hours, heating to 550 ℃ at the speed of 3 ℃/min, and preserving heat for 6 hours. And naturally cooling to room temperature along with the furnace temperature to obtain the hydrophobic molecular sieve based porous foam adsorbent sample.
Example 4
The preparation method of the multi-hydrophobic molecular sieve based porous foam adsorbent is the same as that of the example 3 except for the step one.
Step one, mixing 100 parts by mass of ZSM-5 molecular sieve raw powder and 6 parts by mass of polyacrylamide to obtain mixed dry powder A, adding 3 parts by mass of hydroxymethyl cellulose, 2 parts by mass of glycerol, 7 parts by mass of surfynol TG, 50 parts by mass of alumina sol and 30 parts by mass of deionized water into the mixed dry powder A, and mechanically ball-milling for 20min to obtain slurry B.
Example 5
A multi-hydrophobic molecular sieve based porous foam adsorbent is prepared by the following specific steps:
step one, 100 parts by mass of ZSM-5 molecular sieve raw powder and 3 parts by mass of polyacrylamide are mixed to obtain mixed dry powder A, then 3 parts by mass of hydroxymethyl cellulose, 2 parts by mass of glycerol, 6 parts by mass of surfynol TG, 40 parts by mass of aluminum dihydrogen phosphate and 30 parts by mass of deionized water are added into the mixed dry powder A, and slurry B is prepared after mechanical ball milling for 20 min.
And step two, preparing a NaOH aqueous solution with the mass fraction of 15%, soaking polyurethane foam sponge in the solution, heating and hydrolyzing for 8 hours under the condition of a water bath at 40 ℃, cleaning and airing for later use to obtain the pretreated foam sponge.
And step three, soaking the pretreated polyurethane sponge in the slurry B at normal temperature, blowing redundant slurry on the surface of the pretreated polyurethane sponge by using compressed air after soaking, and placing the soaked polyurethane sponge in an oven at 60 ℃ for drying and shaping for 6 hours to obtain a semi-finished product I.
And step four, soaking the semi-finished product I in a water glass solution at normal temperature for 15 minutes, blowing redundant solution on the surface of the semi-finished product I by using compressed air, drying and shaping the semi-finished product I in an oven at 80 ℃ for 4 hours, placing the semi-finished product I in a muffle furnace for high-temperature roasting, heating to 300 ℃ at the speed of 2 ℃/min, preserving heat for 2 hours, heating to 550 ℃ at the speed of 3 ℃/min, and preserving heat for 5 hours. And naturally cooling to room temperature along with the furnace temperature to obtain a hydrophobic molecular sieve based porous foam adsorbent sample.
Example 6
The preparation method of the multi-hydrophobic molecular sieve based porous foam adsorbent is the same as that of the example 5 except for the step one.
Step one, 100 parts by mass of ZSM-5 molecular sieve raw powder and 5 parts by mass of polyacrylamide are mixed to obtain mixed dry powder A, 2 parts by mass of hydroxymethyl cellulose, 2 parts by mass of glycerol, 6 parts by mass of surfynol TG, 40 parts by mass of aluminum dihydrogen phosphate and 30 parts by mass of deionized water are added into the mixed dry powder A, and slurry B is prepared after mechanical ball milling for 20 min.
Example 7
A preparation method of a multi-hydrophobic molecular sieve based porous foam adsorbent comprises the following steps:
step one, 100 parts by mass of ZSM-5 molecular sieve raw powder and 4 parts by mass of polyacrylamide are mixed to obtain mixed dry powder A, then 3 parts by mass of hydroxymethyl cellulose, 6 parts by mass of white carbon black, 2 parts by mass of glycerol, 6 parts by mass of surfynol TG, 70 parts by mass of silica sol and 15 parts by mass of deionized water are added into the mixed dry powder A, and slurry B is prepared after mechanical ball milling for 20 min.
And step two, preparing a NaOH aqueous solution with the mass fraction of 15%, soaking polyurethane foam sponge in the solution, heating and hydrolyzing for 8 hours under the condition of a water bath at 40 ℃, cleaning and airing for later use to obtain the pretreated foam sponge.
And step three, soaking the pretreated polyurethane sponge in the slurry B at normal temperature, blowing redundant slurry on the surface of the polyurethane sponge by using compressed air after soaking, and placing the polyurethane sponge in an oven at 60 ℃ for drying and shaping for 4 hours to obtain a semi-finished product I.
And step four, soaking the semi-finished product I in a water glass solution at normal temperature for 15 minutes, blowing redundant solution on the surface of the semi-finished product I by using compressed air, drying and shaping the semi-finished product I in an oven at 80 ℃ for 4 hours, placing the semi-finished product I in a muffle furnace for high-temperature roasting, heating to 300 ℃ at the speed of 2 ℃/min, preserving heat for 2 hours, heating to 550 ℃ at the speed of 3 ℃/min, and preserving heat for 6 hours. And naturally cooling to room temperature along with the furnace temperature to obtain the hydrophobic molecular sieve based porous foam adsorbent sample.
Example 8
A multi-hydrophobic molecular sieve based porous foam adsorbent is prepared by the following specific steps: the procedure is as in example 7 except for step one.
Step one, 100 parts by mass of ZSM-5 molecular sieve raw powder and 5 parts by mass of polyacrylamide are mixed to obtain mixed dry powder A, 2 parts by mass of hydroxymethyl cellulose, 7 parts by mass of white carbon black, 2 parts by mass of glycerol, 6 parts by mass of surfynol TG, 50 parts by mass of aluminum dihydrogen phosphate and 30 parts by mass of deionized water are added into the mixed dry powder A, and slurry B is prepared after mechanical ball milling for 20 min.
Test example 1
In the experimental example, the porosity, the specific surface area and the normal-temperature compressive strength of the multi-hydrophobic molecular sieve-based porous foam adsorbent in the example are detected, and the detection results are shown in table 1 below.
The test method of the normal-temperature compressive strength refers to the test method GB/T5072-2008 of the normal-temperature compressive strength of the refractory material.
Table 1 performance test data
Test example 2
This test example dynamic adsorption performance test was performed on the multi-hydrophobic molecular sieve-based porous foam adsorbents of examples 1, 3, 5, 7, and 8:
crushing the prepared sample, sieving the crushed sample by a sieve with 10-20 meshes, putting the sieved sample into a quartz tube, and generating gaseous organic matters by a bubbling method. After passing through a humidity regulator, air passes through a toluene bubbling bottle to generate gaseous toluene, and the toluene bubbling bottle is placed in a constant-temperature water bath kettle to keep the evaporation capacity stable. And the flow rate of the introduced air is controlled by a rotameter. Toluene concentration was measured by Mini RAE3000 PID. The initial inlet of toluene was set at 400mg/m 3 Air flow of 0.5m 3 H is used as the reference value. The results of the experiment are shown in table 2. The hydrophobic molecular sieve can still maintain the adsorption performance under the environment of high humidity.
TABLE 2 breakthrough curves (Ci/Co) for toluene dynamic adsorption of hydrophobic molecular sieve based porous foams
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto without departing from the scope of the invention. Accordingly, it is intended that all such modifications and alterations be included within the scope of this invention as defined in the appended claims.
Claims (6)
1. A preparation method of a hydrophobic molecular sieve based porous foam adsorbent is characterized by comprising the following steps:
(1) Weighing raw materials according to a formula and preparing composite slurry;
the composite slurry contains an inorganic binder, a rheological agent, a dispersing agent, a defoaming agent and a surfactant, wherein the mass ratio of the molecular sieve to the inorganic binder is 100: 30-80, and the mass ratio of other components is as follows: molecular sieve: rheological agent: dispersing agent: defoaming agent: surfactant =100:2 to 10: 2-6: 5 to 10:10 to 50;
the molecular sieve is ZSM-5 and/or SBA-15; siO in the ZSM-5 2 With Al 2 O 3 The ratio of (A) is more than 300, the static water absorption is lower than 2 percent, and the molecular sieve is a hydrophobic molecular sieve;
the inorganic adhesive is one of silica sol, aluminum sol or aluminum dihydrogen phosphate; the silica sol is alkaline, the pH value is 9-10.5, the average grain diameter is 10-30 nm, and the mass fraction is 30-50%; the aluminum sol is acidic, the pH value is 3.5-4, the average grain diameter is 20-30 nm, and the mass fraction is 20-35%; the aluminum dihydrogen phosphate is acidic, the pH value is 1.4-2, and the mass fraction is 30-50%;
the rheological agent is one or more of hydroxymethyl cellulose, kaolin and white carbon black; the viscosity of the hydroxymethyl cellulose is 7000 to 200000cPs;
the dispersant is one or more of ammonium polyvinyl acetate and ammonium polyacrylate;
the defoaming agent is glycerol or one or more selected from organic silicon;
the surfactant is a low-foaming nonionic surfactant;
(2) Soaking the polyurethane sponge in a sodium hydroxide aqueous solution for pretreatment;
(3) Dipping the pretreated polyurethane sponge in the composite slurry, and drying the obtained wet-based sample I to obtain a semi-finished product I;
(4) Dipping the semi-finished product I in water glass, and drying the obtained wet base sample II to obtain a semi-finished product II;
(5) And roasting the semi-finished product II to obtain the hydrophobic molecular sieve based porous foam adsorbent.
2. The method for preparing the hydrophobic molecular sieve-based porous foam adsorbent according to claim 1, wherein in the step (4), the modulus of the water glass is 2.3 to 3, and the mass fraction is 26 to 30%.
3. The preparation method according to claim 1, wherein the calcination temperature in the step (5) is specifically: heating to 280-320 ℃ at the speed of 1.5-2 ℃/min, preserving heat for 1-2 h, then heating to 550-650 ℃ at the speed of 3-5 ℃/min, and preserving heat for 4-6 h.
4. The preparation method according to claim 1 or 3, characterized in that the mass fraction of the sodium hydroxide aqueous solution in the step (2) is 10-20%, the soaking temperature is 35-80 ℃, and the soaking time is 6-10 h;
and/or the drying temperature in the step (3) is 40-80 ℃;
and/or, the dipping time in the step (4) is 10-20 min, and the drying temperature is 60-100 ℃.
5. A hydrophobic molecular sieve based porous foam adsorbent, characterized in that it is prepared by the preparation method of any one of claims 1 to 4.
6. Use of the hydrophobic molecular sieve based porous foam adsorbent of claim 5 for the treatment of VOCs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010121362.1A CN111203176B (en) | 2020-02-26 | 2020-02-26 | Hydrophobic molecular sieve based porous foam adsorbent and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010121362.1A CN111203176B (en) | 2020-02-26 | 2020-02-26 | Hydrophobic molecular sieve based porous foam adsorbent and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111203176A CN111203176A (en) | 2020-05-29 |
| CN111203176B true CN111203176B (en) | 2023-03-28 |
Family
ID=70781556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010121362.1A Active CN111203176B (en) | 2020-02-26 | 2020-02-26 | Hydrophobic molecular sieve based porous foam adsorbent and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111203176B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113548672A (en) * | 2021-07-22 | 2021-10-26 | 南通斐腾新材料科技有限公司 | Method for preparing foam structure zeolite molecular sieve by organic foam chemical growth method |
| CN113443901A (en) * | 2021-09-01 | 2021-09-28 | 佛山市金刚材料科技有限公司 | High-strength alumina foamed ceramic and preparation method thereof |
| CN114652885B (en) * | 2022-03-16 | 2023-05-09 | 武汉理工大学 | Double-layer structure medical sponge dressing for preventing adhesion of new granulation and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193396A (en) * | 2014-08-21 | 2014-12-10 | 江苏南瓷绝缘子股份有限公司 | Preparation method of foamed ceramic |
| CN106237996A (en) * | 2016-09-19 | 2016-12-21 | 广东电网有限责任公司电力科学研究院 | A kind of porous ceramic matrix load type adsorbing agent and preparation method thereof |
| CN108203308A (en) * | 2018-01-16 | 2018-06-26 | 哈尔滨时代创新科技发展有限公司 | A kind of open celled foam basalt materials and production method |
| CN108620121A (en) * | 2018-05-23 | 2018-10-09 | 广东工业大学 | A kind of monoblock type molecular sieve catalyst and its preparation method and application |
| CN109761592A (en) * | 2019-03-29 | 2019-05-17 | 南京航空航天大学 | A kind of Al of hierarchical porous structure2O3-ZrO2Base foamed ceramics and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100392408B1 (en) * | 2000-10-05 | 2003-07-22 | 학교법인 서강대학교 | Macroporous foams comprising microporous zeolite or zeotype material and preparation thereof by using polymeric templates having sponge structure |
-
2020
- 2020-02-26 CN CN202010121362.1A patent/CN111203176B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193396A (en) * | 2014-08-21 | 2014-12-10 | 江苏南瓷绝缘子股份有限公司 | Preparation method of foamed ceramic |
| CN106237996A (en) * | 2016-09-19 | 2016-12-21 | 广东电网有限责任公司电力科学研究院 | A kind of porous ceramic matrix load type adsorbing agent and preparation method thereof |
| CN108203308A (en) * | 2018-01-16 | 2018-06-26 | 哈尔滨时代创新科技发展有限公司 | A kind of open celled foam basalt materials and production method |
| CN108620121A (en) * | 2018-05-23 | 2018-10-09 | 广东工业大学 | A kind of monoblock type molecular sieve catalyst and its preparation method and application |
| CN109761592A (en) * | 2019-03-29 | 2019-05-17 | 南京航空航天大学 | A kind of Al of hierarchical porous structure2O3-ZrO2Base foamed ceramics and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| "泡沫结构多级孔ZSM-5分子筛的制备与表征";姚军康等;《石油学报（石油加工）》;20140228;第30卷(第1期);145-150 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111203176A (en) | 2020-05-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111203176B (en) | Hydrophobic molecular sieve based porous foam adsorbent and preparation method and application thereof | |
| CN102389773B (en) | Manufacture method of molecular sieve honeycomb body for absorbing volatile organic compounds | |
| CN111203175B (en) | Honeycomb hydrophobic molecular sieve adsorbent and preparation method and application thereof | |
| CN103172402B (en) | Multifunctional porous purifying ceramic granular material and preparation method | |
| CN108558381A (en) | A kind of the diatomite nogging and preparation method of high-efficient purification room air | |
| CN112058226B (en) | Organic silicon-activated carbon modified composite material and preparation method thereof | |
| CN100352540C (en) | Method for preparing titanium modified silica gel adsorption block | |
| CN107663084B (en) | Air-purifying humidity-adjusting ceramic tile and preparation method thereof | |
| CN109647342B (en) | Moisture-proof renewable activated carbon and preparation method thereof | |
| CN104129978A (en) | Ceramic foam sound absorption and noise reduction plate and preparation process thereof | |
| KR20130047256A (en) | Amine and amine group contained solid sorbent for dry co2 capture process and its preparation method thereof | |
| CN107376835B (en) | Efficient hydrogen production adsorbent and preparation method thereof | |
| KR20080103670A (en) | The co2 gas absorbent and its manufacturing method | |
| CN108484224B (en) | Composition capable of generating negative oxygen ions on material surface and surface treatment method | |
| CN107262048B (en) | Low-temperature regeneration dehumidifying material of bacterial cellulose composite moisture absorbent | |
| CN102145278B (en) | Adsorption system for carbon dioxide | |
| CN108160031A (en) | It is a kind of for composite material of purifying low-concentration gaseous pollutant and preparation method thereof | |
| CN101972627B (en) | Rare-earth modified molecular-sieve dehumidification adsorbent paper sheet and preparation method thereof | |
| CN112588257B (en) | Ordered mesoporous silicon-glass fiber paper composite material and preparation method and application thereof | |
| CN113769706A (en) | Air purification material and preparation method thereof | |
| JP2014237552A (en) | Method for producing zeolite structure | |
| CN108201889A (en) | It is a kind of using porous ceramics as the photocatalyst air purifying material of carrier | |
| CN107649098B (en) | Preparation method of sulfydryl-rich adsorption material for adsorbing heavy metal ions | |
| CN109289508A (en) | A kind of preparation method of high hydrophobicity zeolitic material | |
| Gang et al. | A promoted mesoporous silica-based material for SO2 adsorption |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |