CN114669276A - Production process of molecular sieve desiccant - Google Patents
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- CN114669276A CN114669276A CN202210140356.XA CN202210140356A CN114669276A CN 114669276 A CN114669276 A CN 114669276A CN 202210140356 A CN202210140356 A CN 202210140356A CN 114669276 A CN114669276 A CN 114669276A
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- 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
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- 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
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- 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
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
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- 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
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/046—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium containing halogens, e.g. halides
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- 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
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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
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
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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
- B01J20/28—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
- B01J20/28016—Particle form
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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
- B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
Abstract
The invention discloses a production process of a molecular sieve desiccant, which comprises the following steps: a) mixing raw materials; b) seed production; c) balling; d) screening; e) drying; f) compared with the prior art, the roasting improves the water absorption performance and the practicability.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of drying agents, in particular to the technical field of a production process of a molecular sieve drying agent.
[ background of the invention ]
The molecular sieve desiccant is mainly formed by connecting silicon and aluminum through oxygen bridges to form a hollow framework structure, and a plurality of pore passages with uniform pore diameters and cavities with orderly arrangement and large internal surface areas are arranged in the structure. In addition, the metal ion with lower electrovalence and larger ionic radius and the water in a compound state are also contained. The water molecules are continuously lost after being heated, but the crystal skeleton structure is unchanged, so that a plurality of cavities with the same size are formed, the cavities are connected with a plurality of micropores with the same diameter, the diameters of the micropores are uniform, molecules with the diameter smaller than that of the pore channel can be adsorbed into the inner part of the pores, and molecules with the diameter larger than that of the pore channel are excluded, so that the molecules with different shapes, diameters and sizes, different polarity degrees, different boiling points and different saturation degrees can be separated, namely the molecular sieve has the function of sieving the molecules, and is called as the molecular sieve. Molecular sieves are widely used in the metallurgical, chemical, electronic, petrochemical, natural gas, and other industries.
With the rapid development of industry, the market competitiveness is more and more intense, the molecular sieve desiccant produced by the traditional process cannot meet the industrial requirement, and the market competitiveness is poor, so that a production process of the molecular sieve desiccant for improving the water absorption capacity is required.
[ summary of the invention ]
The invention aims to solve the problems in the prior art and provides a production process of a molecular sieve desiccant for improving water absorption capacity.
In order to realize the purpose, the invention provides a production process of a molecular sieve desiccant, which comprises the following steps:
a) mixing raw materials: adding 30-50 parts by weight of kaolin, 50-70 parts by weight of molecular sieve raw powder and 5-10 parts by weight of sodium pyrophosphate into an inverted conical mixer, and uniformly mixing;
b) seed production: sequentially carrying out processes of soaking in a drying solution, drying and extrusion forming on yarns to form a composite outer layer, cooling and shaping, cutting into granules and polishing into a rough surface to obtain seeds, wherein the yarns are plant fiber yarns;
c) balling: pouring the seeds into a sugar coating machine, slowly spraying the solution, spraying the uniformly mixed raw materials into the sugar coating machine in several times after the seeds are wetted, stopping spraying the solution and adding the raw materials after the seeds are formed into balls to a certain degree, and taking the balls out of the pot after exposure for 25-35 minutes to obtain formed balls;
d) Screening: screening the spherical particles to obtain qualified spherical particles;
e) and (3) drying: drying qualified spherical particles by a belt dryer, wherein the belt dryer is divided into four heating zones, and the temperatures are respectively set as follows: the first zone is 40-50 ℃, the second zone is 60-70 ℃, the third zone is 80-90 ℃, the fourth zone is 50-60 ℃, and the conveying speed is as follows: 3-5 m/min;
f) roasting: putting the dried spherical particles into a roasting furnace for roasting to obtain a finished product molecular sieve, wherein the roasting furnace is divided into nine heating zones, the set temperature of each zone of the roasting furnace is 420-480 ℃ in a first zone, 420-480 ℃ in a second zone, 450-520 ℃ in a third zone, 520-580 ℃ in a fourth zone, 580-620 ℃ in a fifth zone, 620-680 ℃ in a sixth zone, 720-780 ℃ in a seventh zone, 720-780 ℃ in an eighth zone, 580-620 ℃ in a ninth zone, and the rotating speed is as follows: 1 to 3 r/min.
Preferably, the drying liquid comprises the following components in parts by mass: calcium oxide: 5-6 parts of calcium chloride: 8-9 parts of copper sulfate: 0.3-0.6 parts of ammonium dihydrogen phosphate: 2-3 parts of aluminum hydroxide and 10-15 parts of aluminum hydroxide.
Preferably, the composite outer layer is a thermoset plastic.
Preferably, the solution is a sodium tripolyphosphate solution, and the mass ratio of the sodium tripolyphosphate to the water is as follows: 1-3: 18 to 40.
Preferably, the method further comprises a pressing step between the extrusion forming and the cooling forming, wherein the pressing step is to form spaced indentations on the yarns forming the composite outer layer by rolling the yarns through gear-shaped pressing wheels which are correspondingly arranged up and down.
Preferably, the cutting-granulating step is cutting from an indentation.
Preferably, the four heating zones in the e) drying step are respectively set to have the following temperatures: the first zone is 45 ℃, the second zone is 65 ℃, the third zone is 85 ℃, and the fourth zone is 55 ℃, wherein the conveying speed is as follows: 4 m/min.
Preferably, the nine heating zones in the f) roasting step are respectively set at the following temperatures: the first zone is 420 ℃, the second zone is 420 ℃, the third zone is 450 ℃, the fourth zone is 520-580 ℃, the fifth zone is 580 ℃, the sixth zone is 620 ℃, the seventh zone is 720 ℃, the eighth zone is 720 ℃, the ninth zone is 580 ℃, and the rotating speed is as follows: 2 r/min.
The invention has the beneficial effects that: the invention combines the fiber drying and the molecular sieve drying, which gives play to respective advantages, the fiber drying has high moisture absorption rate and high moisture absorption rate, the saturated moisture absorption rate can reach 100 percent of the self weight, which is three times of that of the common drying agent, and the molecular sieve drying still can absorb a large amount of water vapor in the environment under the condition of ultralow humidity, thereby effectively controlling the environment humidity; the moisture absorption speed is very fast, a large amount of water vapor is absorbed in a very short time, and compared with the prior art, the moisture absorption performance and the practicability are improved.
The moisture absorption of the yarns is further improved by soaking the yarns in the drying liquid, the composite outer layer formed by the extrusion forming process plays a role in heat insulation and protection, the exposure of the yarns is reduced, the water-fixing property is improved, the yarns are polished to be rough surfaces, the adhesion is improved, the yarns are convenient to form balls, the yarns at the positions are embedded into the composite outer layer by opposite pressing, the cross section area of the yarns is reduced, and the water-fixing property is further improved.
[ description of the drawings ]
FIG. 1 is a schematic illustration of the pressing step.
[ detailed description ] embodiments
Example 1
Referring to fig. 1, a process for producing a molecular sieve desiccant comprises the following steps: a) mixing raw materials: adding 30 parts by weight of kaolin, 70 parts by weight of molecular sieve raw powder and 5 parts by weight of sodium pyrophosphate into an inverted conical mixer, and uniformly mixing;
b) seed production: sequentially carrying out processes of soaking in a drying solution, drying and extrusion forming on yarns to form a composite outer layer, cooling and shaping, cutting into granules and polishing into rough surfaces to obtain seeds, wherein the yarns are plant fiber yarns, and the drying solution comprises the following components in parts by mass: calcium oxide: 6 parts of calcium chloride: 8 parts of copper sulfate: 0.3 part, ammonium dihydrogen phosphate: 3 parts of aluminum hydroxide and 10 parts of composite outer layer, wherein the composite outer layer is made of thermosetting plastic; the method also comprises a pressing step between extrusion forming and cooling forming, wherein the pressing step is to form spaced indentations on the yarns forming the composite outer layer by rolling through gear-shaped pressing wheels 1 which are correspondingly arranged up and down, and the cutting and granulating step is to cut the yarns from the indentations;
c) Balling: pouring the seeds into a sugar coating machine, slowly spraying a solution, spraying the uniformly mixed raw materials into the sugar coating machine in several times after the seeds are wetted, stopping spraying the solution and adding the raw materials after the seeds are formed into balls to a certain degree, exposing for 30 minutes, and taking the balls out of the pot to obtain the spherical particles, wherein the solution is a sodium tripolyphosphate solution, and the mass ratio of the sodium tripolyphosphate to the water is as follows: 2: 30, of a nitrogen-containing gas;
d) screening: screening the spherical particles to obtain qualified spherical particles;
e) and (3) drying: drying qualified spherical particles by a belt dryer, wherein the belt dryer is divided into four heating zones, and the temperatures are respectively set as follows: the first zone is 45 ℃, the second zone is 60 ℃, the third zone is 80 ℃ and the fourth zone is 60 ℃, and the conveying speed is as follows: 3 m/min;
f) roasting: and putting the dried spherical particles into a roasting furnace for roasting to obtain a finished product molecular sieve, wherein the roasting furnace is divided into nine heating zones, the set temperature of each zone of the roasting furnace is 420 ℃ in the first zone, 420 ℃ in the second zone, 450 ℃ in the third zone, 550 ℃ in the fourth zone, 580 ℃ in the fifth zone, 620 ℃ in the sixth zone, 720 ℃ in the seventh zone, 720 ℃ in the eighth zone, 580 ℃ in the ninth zone, and the rotating speed is as follows: 2 r/min.
Example 2
Referring to fig. 1, a process for producing a molecular sieve desiccant comprises the following steps: a) mixing raw materials: adding 50 parts by weight of kaolin, 70 parts by weight of molecular sieve raw powder and 10 parts by weight of sodium pyrophosphate into an inverted conical mixer, and uniformly mixing;
b) Seed production: sequentially carrying out processes of soaking in a drying solution, drying and extrusion forming on yarns to form a composite outer layer, cooling and shaping, cutting into granules and polishing into a rough surface to obtain seeds, wherein the yarns are plant fiber yarns, and the drying solution comprises the following components in parts by mass: calcium oxide: 6 parts of calcium chloride: 9 parts of copper sulfate: 0.6 part, ammonium dihydrogen phosphate: 3 parts of aluminum hydroxide and 15 parts of aluminum hydroxide, wherein the composite outer layer is thermosetting plastic; the method also comprises a pressing step between extrusion forming and cooling forming, wherein the pressing step is to form spaced indentations on the yarns forming the composite outer layer by rolling through gear-shaped pressing wheels 1 which are correspondingly arranged up and down, and the cutting and granulating step is to cut the yarns from the indentations;
c) balling: pouring the seeds into a sugar coating machine, slowly spraying a solution, spraying the uniformly mixed raw materials into the sugar coating machine in several times after the seeds are wetted, stopping spraying the solution and adding the raw materials after the seeds are formed into balls to a certain degree, and taking the balls out of the pot after exposure for 25 minutes to obtain the formed balls, wherein the solution is a sodium tripolyphosphate solution, and the mass ratio of the sodium tripolyphosphate to the water is as follows: 3: 40;
d) screening: screening the spherical particles to obtain qualified spherical particles;
e) And (3) drying: drying qualified spherical particles by a belt dryer, wherein the belt dryer is divided into four heating zones, and the temperatures are respectively set as follows: the first zone is 50 ℃, the second zone is 60 ℃, the third zone is 80 ℃ and the fourth zone is 60 ℃, the conveying speed is as follows: 3 m/min;
f) roasting: and putting the dried spherical particles into a roasting furnace for roasting to obtain a finished product molecular sieve, wherein the roasting furnace is divided into nine heating zones, the set temperature of each zone of the roasting furnace is 480 ℃ in the first zone, 480 ℃ in the second zone, 520 ℃ in the third zone, 580 ℃ in the fourth zone, 620 ℃ in the fifth zone, 680 ℃ in the sixth zone, 780 ℃ in the seventh zone, 780 ℃ in the eighth zone and 620 ℃ in the ninth zone, and the rotating speed is as follows: 3 r/min.
Example 3
Referring to fig. 1, a process for producing a molecular sieve desiccant comprises the following steps: a) mixing raw materials: adding 40 parts by weight of kaolin, 60 parts by weight of molecular sieve raw powder and 8 parts by weight of sodium pyrophosphate into an inverted conical mixer, and uniformly mixing;
b) seed production: sequentially carrying out processes of soaking in a drying solution, drying and extrusion forming on yarns to form a composite outer layer, cooling and shaping, cutting into granules and polishing into a rough surface to obtain seeds, wherein the yarns are plant fiber yarns, and the drying solution comprises the following components in parts by mass: calcium oxide: 5.5 parts of calcium chloride: 8.5 parts of copper sulfate: 0.4 part, ammonium dihydrogen phosphate: 2.5 parts and 13 parts of aluminum hydroxide, wherein the composite outer layer is made of thermosetting plastic; the method also comprises a pressing step between extrusion forming and cooling forming, wherein the pressing step is to form spaced indentations on the yarns forming the composite outer layer by rolling through gear-shaped pressing wheels 1 which are correspondingly arranged up and down, and the cutting and granulating step is to cut the yarns from the indentations;
c) Balling: pouring the seeds into a sugar coating machine, slowly spraying a solution, spraying the uniformly mixed raw materials into the sugar coating machine in several times after the seeds are wetted, stopping spraying the solution and adding the raw materials after the seeds are formed into balls to a certain degree, and taking the balls out of the pot after exposure for 35 minutes to obtain the formed balls, wherein the solution is a sodium tripolyphosphate solution, and the mass ratio of the sodium tripolyphosphate to the water is as follows: 1: 18;
d) screening: screening the spherical particles to obtain qualified spherical particles;
e) and (3) drying: drying qualified spherical particles by a belt dryer, wherein the belt dryer is divided into four heating zones, and the temperatures are respectively set as follows: the first zone is 45 ℃, the second zone is 65 ℃, the third zone is 85 ℃, the fourth zone is 55 ℃, and the conveying speed is as follows: 4 m/min;
f) roasting: and putting the dried spherical particles into a roasting furnace for roasting to obtain a finished product molecular sieve, wherein the roasting furnace is divided into nine heating zones, the set temperature of each zone of the roasting furnace is 450 ℃ in the first zone, 450 ℃ in the second zone, 500 ℃ in the third zone, 550 ℃ in the fourth zone, 600 ℃ in the fifth zone, 600 ℃ in the sixth zone, 750 ℃ in the seventh zone, 750 ℃ in the eighth zone and 600 ℃ in the ninth zone, and the rotating speed is as follows: 2 r/min.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.
Claims (8)
1. A production process of a molecular sieve desiccant is characterized by comprising the following steps: the method comprises the following steps:
a) mixing raw materials: adding 30-50 parts by weight of kaolin, 50-70 parts by weight of molecular sieve raw powder and 5-10 parts by weight of sodium pyrophosphate into an inverted conical mixer, and uniformly mixing;
b) seed production: sequentially carrying out processes of soaking in a drying solution, drying and extrusion forming on yarns to form a composite outer layer, cooling and shaping, cutting into granules and polishing into a rough surface to obtain seeds, wherein the yarns are plant fiber yarns;
c) balling: pouring the seeds into a sugar coating machine, slowly spraying the solution, spraying the uniformly mixed raw materials into the sugar coating machine in several times after the seeds are wetted, stopping spraying the solution and adding the raw materials after the seeds are formed into balls to a certain degree, and taking the balls out of the pot after exposure for 25-35 minutes to obtain formed balls;
d) screening: screening the spherical particles to obtain qualified spherical particles;
e) and (3) drying: drying qualified spherical particles by a belt dryer, wherein the belt dryer is divided into four heating zones, and the temperatures are respectively set as follows: the first zone is 40-50 ℃, the second zone is 60-70 ℃, the third zone is 80-90 ℃, the fourth zone is 50-60 ℃, and the conveying speed is as follows: 3-5 m/min;
f) roasting: putting the dried spherical particles into a roasting furnace for roasting to obtain a finished product molecular sieve, wherein the roasting furnace is divided into nine heating zones, the set temperature of each zone of the roasting furnace is 420-480 ℃ in a first zone, 420-480 ℃ in a second zone, 450-520 ℃ in a third zone, 520-580 ℃ in a fourth zone, 580-620 ℃ in a fifth zone, 620-680 ℃ in a sixth zone, 720-780 ℃ in a seventh zone, 720-780 ℃ in an eighth zone, 580-620 ℃ in a ninth zone, and the rotating speed is as follows: 1 to 3 r/min.
2. The process of claim 1 for producing a molecular sieve desiccant, wherein: the drying liquid comprises the following components in parts by mass: calcium oxide: 5-6 parts of calcium chloride: 8-9 parts of copper sulfate: 0.3-0.6 parts of ammonium dihydrogen phosphate: 2-3 parts of aluminum hydroxide and 10-15 parts of aluminum hydroxide.
3. The process of claim 1 for producing a molecular sieve desiccant, wherein: the composite outer layer is made of thermosetting plastic.
4. The process of claim 1 for producing a molecular sieve desiccant, wherein: the solution is a sodium tripolyphosphate solution, and the mass ratio of the sodium tripolyphosphate to the water is as follows: 1-3: 18 to 40.
5. The process of claim 1 for producing a molecular sieve desiccant, wherein: the method also comprises a pressing step between extrusion forming and cooling forming, wherein the pressing step is to form spaced pressing marks on the yarns forming the composite outer layer by rolling through gear-shaped pressing wheels (1) which are correspondingly arranged up and down.
6. The process of claim 5 for the production of a molecular sieve desiccant, wherein: the cutting and granulating step is cutting from the indentation.
7. The process of claim 1 for producing a molecular sieve desiccant, wherein: the four heating zones in the step e) are respectively set to have the following temperatures: the first zone is 45 ℃, the second zone is 65 ℃, the third zone is 85 ℃, the fourth zone is 55 ℃, and the conveying speed is as follows: 4 m/min.
8. A process as claimed in claims 1 to 7 for the production of a molecular sieve desiccant, wherein: the nine heating zones in the f) roasting step are respectively set to have the following temperatures: the first zone is 420 ℃, the second zone is 420 ℃, the third zone is 450 ℃, the fourth zone is 550 ℃, the fifth zone is 580 ℃, the sixth zone is 620 ℃, the seventh zone is 720 ℃, the eighth zone is 720 ℃ and the ninth zone is 580 ℃, and the rotating speed is as follows: 2 r/min.
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| CN112619604A (en) * | 2020-12-01 | 2021-04-09 | 上海雪峰分子筛有限公司 | 4A molecular sieve and preparation method thereof |
| CN113462181A (en) * | 2021-08-23 | 2021-10-01 | 国际竹藤中心 | Mould-proof flame-retardant wear-resistant integrated odorless plant fiber reinforced thermoplastic polymer composite material and preparation and application thereof |
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2022
- 2022-02-16 CN CN202210140356.XA patent/CN114669276A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103192538A (en) * | 2012-01-05 | 2013-07-10 | 辽宁辽杰科技有限公司 | Packing belt and manufacturing method thereof |
| CN107107007A (en) * | 2014-11-05 | 2017-08-29 | 马格奥托马蒂克公司 | The purposes of the granulating system and the compression roller comminutor of compression roller comminutor including the compression roller comminutor |
| CN112058218A (en) * | 2020-08-21 | 2020-12-11 | 上海航中实业有限公司 | Preparation method of professional molecular sieve drying agent for brake system |
| CN112495343A (en) * | 2020-11-30 | 2021-03-16 | 东莞市鼎兴实业有限公司 | Anti-mildew drying agent and preparation method thereof |
| CN112619604A (en) * | 2020-12-01 | 2021-04-09 | 上海雪峰分子筛有限公司 | 4A molecular sieve and preparation method thereof |
| CN113462181A (en) * | 2021-08-23 | 2021-10-01 | 国际竹藤中心 | Mould-proof flame-retardant wear-resistant integrated odorless plant fiber reinforced thermoplastic polymer composite material and preparation and application thereof |
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