CN112121606A - Drying agent and preparation method thereof - Google Patents
Drying agent and preparation method thereof Download PDFInfo
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- CN112121606A CN112121606A CN202011076715.7A CN202011076715A CN112121606A CN 112121606 A CN112121606 A CN 112121606A CN 202011076715 A CN202011076715 A CN 202011076715A CN 112121606 A CN112121606 A CN 112121606A
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- magnesium
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- 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
- B01D53/28—Selection of materials for use as drying agents
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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
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- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Drying Of Gases (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a drying agent and a preparation method thereof, the drying agent is mainly composed of magnesium oxide and magnesium chloride, and the drying agent comprises the following components by weight percent: 10-90 parts of magnesium oxide, magnesium hydroxide, magnesium carbonate or one or more mixtures thereof with high content of magnesium oxide; 5-90 parts of anhydrous magnesium chloride containing high content of magnesium chloride or/and magnesium chloride containing N crystal water; and adding alumina and/or clay, lignin and/or molecular sieve raw powder, glass fiber, carboxymethyl cellulose and the like, and sequentially stirring, mixing, granulating, screening, drying and roasting to obtain the drying agent which is granular, has an excellent moisture absorption effect and is still in a granular block shape after moisture absorption.
Description
Technical Field
The invention relates to a drying agent and a preparation method thereof.
Background
The desiccant is produced in order to avoid the occurrence of defective products due to excessive moisture. The types of the desiccant are classified into physical adsorption desiccant and chemical adsorption desiccant according to their drying principle. Physical adsorption desiccants such as molecular sieves, adsorb moisture by physical means, such as by utilizing numerous micropores within the desiccant particles; chemisorptive desiccants are exemplified by calcium oxide, which effect its drying action by combining with water to produce stable calcium hydroxide.
The desiccant has wide application, and is suitable for various industries such as instruments, meters, electrical equipment, medicines, foods, textiles and the like and other various packaging articles. According to respective environmental requirements, various industries correspondingly put different requirements on performances, forms and the like of the drying agent, such as: in the field of monitoring cameras, the lens is easy to fog due to the existence of water vapor in the camera and the change of temperature, so that the imaging is fuzzy, the moisture-proof work of the lens of the monitoring camera is an important part related to the excellent rate of the product, the moisture absorption effect requirement on a drying agent is higher, and the requirement of a common drying agent is difficult to achieve; meanwhile, the desiccant can collide with sharp corners of electronic components in the using process to generate a risk of hole breaking, so that the desiccant is required to be in a particle state before and after moisture absorption, and the equipment cannot be influenced in the using process. However, the existing drying agents such as molecular sieves and calcium oxide have low moisture absorption performance and are difficult to meet the use requirements of partial equipment, and the magnesium oxide/magnesium chloride drying agents with high moisture absorption performance are in powder states before and after moisture absorption, easily influence the equipment in the use process and have great potential safety hazards. In summary, the existing drying agents all have the defects of low moisture absorption performance or powder state, and cannot meet the requirements of partial equipment and products with higher requirements, so that a novel drying agent needs to be developed to solve the problems of moisture absorption effect of the drying agent and use safety of the drying agent in the powder state before and after moisture absorption.
Disclosure of Invention
The invention aims to provide a drying agent and a preparation method thereof aiming at the defects of moisture absorption effect and use safety of the drying agent in the prior art, so that the drying agent can be used by equipment and products with high requirements, and the moisture in the equipment or the products can be dried safely, quickly, for a long time and efficiently.
The technical scheme provided by the invention is as follows:
the material is prepared from magnesium oxide with high content of magnesium oxide, magnesium hydroxide, magnesium carbonate or one or more of the mixture; anhydrous magnesium chloride with high magnesium chloride content or/and magnesium chloride with N crystal water; adding alumina and/or clay, lignin and/or molecular sieve raw powder, glass fiber and carboxymethyl cellulose, stirring with water, granulating, sieving, drying, and calcining,
the magnesium oxide, magnesium hydroxide, magnesium carbonate or one or a mixture of more of them containing high content of magnesium oxide is preferably magnesium hydroxide and/or magnesium carbonate.
The anhydrous magnesium chloride containing high content of magnesium chloride or/and magnesium chloride containing N crystal water is preferably magnesium chloride hexahydrate.
The desiccant and the preparation method thereof comprise, by weight, 5-90 parts of magnesium oxide and/or magnesium hydroxide and/or magnesium carbonate and 5-90 parts of magnesium chloride hexahydrate; 1-50 parts of alumina or clay, 0.1-20 parts of lignin or molecular sieve raw powder, 0.1-20 parts of carboxymethyl cellulose and 0.1-20 parts of glass fiber.
Preferably, the feed comprises the following raw materials in parts by weight: 10-70 parts of magnesium oxide and/or magnesium hydroxide and/or magnesium carbonate and 40-90 parts of magnesium chloride hexahydrate; 1-30 parts of alumina or clay, 0.1-5 parts of lignin or molecular sieve raw powder, 0.1-5 parts of carboxymethyl cellulose and 0.1-5 parts of glass fiber.
Preferably, the feed comprises the following raw materials in parts by weight: 10-60 parts of magnesium oxide and/or magnesium hydroxide and/or magnesium carbonate and 50-85 parts of magnesium chloride hexahydrate; 1-20 parts of alumina or clay, 0.1-2 parts of lignin or molecular sieve raw powder, 0.1-2 parts of carboxymethyl cellulose and 0.1-2 parts of glass fiber.
Preferably, the feed comprises the following raw materials in parts by weight: 10-50 parts of magnesium oxide and/or magnesium hydroxide and/or magnesium carbonate and 50-80 parts of magnesium chloride hexahydrate; 1-15 parts of alumina or clay, 0.1-2 parts of lignin or molecular sieve raw powder, 0.1-2 parts of carboxymethyl cellulose and 0.1-2 parts of glass fiber.
Preferably, the feed comprises the following raw materials in parts by weight: 15-50 parts of magnesium oxide and/or magnesium hydroxide and/or magnesium carbonate and 50-75 parts of magnesium chloride hexahydrate; 1-10 parts of alumina or clay, 0.1-1 part of lignin or molecular sieve raw powder, 0.1-1 part of carboxymethyl cellulose and 0.1-1 part of glass fiber.
Preferably, the feed comprises the following raw materials in parts by weight: 20-50 parts of magnesium hydroxide and 50-70 parts of magnesium chloride hexahydrate; 1-10 parts of alumina or clay, 0.5-1 part of lignin or molecular sieve raw powder, 0.5-1 part of carboxymethyl cellulose and 0.5-1 part of glass fiber.
Preferably, the feed comprises the following raw materials in parts by weight: 25-50 parts of magnesium hydroxide and 50-65 parts of magnesium chloride hexahydrate; 10-15 parts of alumina, 0.5-1 part of lignin, 0.5-1 part of carboxymethyl cellulose and 0.5-1 part of glass fiber.
Preferably, the feed comprises the following raw materials in parts by weight: 30-50 parts of magnesium carbonate and 50-60 parts of magnesium chloride hexahydrate; 1-10 parts of clay, 0.5-0.8 part of lignin, 0.5-0.8 part of carboxymethyl cellulose and 0.5-0.8 part of glass fiber.
Preferably, the clay is kaolin, and the kaolin can further enhance the skeleton strength of the desiccant particles, so that the desiccant particles are not easy to scatter or deform, and the shapes of the particles are more stable.
The raw materials in the invention adopt the function of magnesium chloride hexahydrate: because the water vapor decomposed during roasting almost completely and rapidly escapes, a large number of micropores and pore channels are generated in the desiccant particles to provide space for subsequent moisture adsorption, and the desiccant is prevented from absorbing water, pulverizing and expanding;
the effect of the lignin is as follows: the lignin can be completely oxidized and removed in continuous high-temperature roasting, and a large number of micropores and pore passages are reserved at the original position;
the effect of introducing alumina: the hydrated alumina can form a large number of micropores and pore channels and a binding effect when being roasted.
The effect of introducing clay and glass fiber: can form a skeleton during roasting;
the raw materials are cooperated, so that the drying agent forms a firm three-dimensional network framework structure and extremely rich micropores and pore channels during roasting, and the original particle state and smaller volume expansion are still maintained after moisture absorption; meanwhile, the magnesium oxide/magnesium chloride desiccant has the chemical adsorption function which is the same as that of a magnesium oxide/magnesium chloride desiccant, and is even better than the activity, the water absorption capacity and the water fixing capacity of magnesium oxide/magnesium chloride. Therefore, the method not only continues the function of absorbing moisture even better than that of magnesium oxide/magnesium chloride, but also solves the disadvantages that the magnesium oxide/magnesium chloride desiccant is in a powder state before moisture absorption and is easy to expand in volume after moisture absorption.
Detailed Description
Example 1: preparation of drying agent
(1) Selecting 40 parts of magnesium hydroxide and 45 parts of magnesium chloride hexahydrate according to requirements; 13 parts of aluminum oxide, 0.7 part of lignin, 0.7 part of carboxymethyl cellulose and 0.6 part of glass fiber, and opening a discharge port of a powder mixer to discharge;
(2) after the powder mixing is finished, adding the mixed powder into a granulating machine, and adding water for granulating;
(3) after granulation is finished, the formed particles are put into a vibrating screen for screening and polishing;
(4) after polishing, drying the semi-finished product particles by a dryer, wherein the temperature distribution of the dryer is in a trapezoidal temperature rising trend of 80-120 ℃ from an inlet to an outlet of the dryer;
(5) after drying, roasting the semi-finished product particles to prepare finished product particles, and roasting the dried semi-finished product particles in a roasting furnace, wherein the roasting temperature of the roasting furnace is 100-420 ℃ and is subjected to trapezoidal temperature rise, and the roasting time is about 2-4 hours, so that the semi-finished product particles can be completely fixed in shape to prepare finished product particles;
(6) after the calcination is completed, the required drying agent is obtained.
Example 2: preparation of drying agent
Prepared with reference to example 1, 30 parts of magnesium hydroxide and 58 parts of magnesium chloride hexahydrate; 10 parts of alumina, 0.9 part of lignin, 0.5 part of carboxymethyl cellulose and 0.6 part of glass fiber.
Example 3: preparation of drying agent
Prepared with reference to example 1, 25 parts of magnesium hydroxide and 63 parts of magnesium chloride hexahydrate; 10 parts of kaolin, 0.9 part of lignin, 0.5 part of carboxymethyl cellulose and 0.6 part of glass fiber.
Example 4: preparation of drying agent
Preparation was carried out with reference to example 1, 48 parts of magnesium carbonate and 48 parts of magnesium chloride hexahydrate; 2 parts of alumina, 0.9 part of lignin, 0.5 part of carboxymethyl cellulose and 0.6 part of glass fiber.
Example 5: preparation of drying agent
Preparation was carried out with reference to example 1, 48 parts of magnesium carbonate and 48 parts of magnesium chloride hexahydrate; 2 parts of kaolin, 0.9 part of lignin, 0.5 part of carboxymethyl cellulose and 0.6 part of glass fiber.
Example 6: preparation of drying agent
Prepared with reference to example 1, 49 parts of magnesium carbonate and 49 parts of magnesium chloride hexahydrate; 0.9 part of lignin, 0.5 part of carboxymethyl cellulose and 0.6 part of glass fiber.
Comparative example 1:
is selected from commercially available molecular sieves, in particular 4A molecular sieves from Okajima Chemicals, Inc.
Performance test:
3g of the desiccant materials of the embodiments 1-5 and the comparative example 1 are weighed respectively, the desiccant products are packaged by breathable non-woven fabrics, the desiccant products and an RC-4HA/C temperature and humidity recorder (Jiangsu province, Fine creative electric products Co., Ltd.) are respectively placed in a 5L closed container, the water leakage is 0.027-0.035 g of water/24 h, the temperature is 30 ℃, and the RH is 80%.
After standing for 80 days (ambient temperature and humidity: 30 ℃, 80.0% RH), the recorder data were read:
(1) reaching 30 ℃/10.0% RH for the required time
| Example (b) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Comparative example 1 |
| Time of day | 29h | 26h | 23h | 21h | 21h | 20h | 20.5h |
Among them, comparative example 1 has the fastest speed for moisture elimination, which is mainly determined by the performance of the molecular sieve, but the pure molecular sieve cannot achieve the effect of long-term and efficient moisture elimination. In examples 1 to 5, the speed of moisture removal is improved significantly by adjusting the content of magnesium chloride, and the requirement of rapid moisture removal can be met.
(2) Maintaining at 30 deg.C for a period of less than 10.0% RH
| Example (b) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Comparative example 1 |
| Time of day | 24 days | 26 days | 31 days | 36 days | 37 days | For 38 days | 11.5 days |
The desiccant products of examples 1-5 provide a much greater improvement over comparative example 1 in maintaining a low humidity environment.
(3) At 30 deg.C, the humidity of 10.0% RH gradually rises to 50% RH, and the effective time for maintaining the ambient humidity
| Example (b) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Comparative example 1 |
| Time of day | 46 days | 51 days | 60 days | 69.5 days | 71 days | 73 days | 15.5 days |
Compared with the comparative example 1, the desiccant products of the examples 1 to 5 have the humidity of 10.0% RH gradually increased to 50% RH at 30 ℃, and the effective time for maintaining the ambient humidity is obviously prolonged.
It was observed that the desiccant products of examples 1-5 remained dry and free of fine powder particles after 80 days of moisture absorption.
In summary, the following steps: compared with the existing better 4A molecular sieve desiccant and the desiccant prepared by the method, the desiccant has the advantages that the rapid moisture absorption is basically equivalent; but has great advantages in maintaining the long-term effect of low humidity in the environment. The drying agent prepared by the method can completely meet the requirements of high-requirement equipment, articles and the like on safe, quick, long-term and efficient drying effect.
Claims (10)
1. A drying agent and a preparation method thereof are characterized in that: adding alumina and/or clay, lignin and/or molecular sieve raw powder, glass fiber and carboxymethyl cellulose adhesive into magnesium oxide, magnesium hydroxide, magnesium carbonate or one or more of the mixture, anhydrous magnesium chloride or/and magnesium chloride with N crystal water; according to the weight portion of the raw materials, 5-90 portions of magnesium oxide and/or magnesium hydroxide and/or magnesium carbonate or one or a plurality of mixtures thereof, 10-90 portions of anhydrous magnesium chloride and/or magnesium chloride with N crystal water, 0.5-50 portions of alumina and/or clay, 0.1-10 portions of lignin and/or molecular sieve raw powder, and 0.1-10 portions of glass fiber and carboxymethyl cellulose adhesive are sequentially stirred by adding water, granulated, screened, dried and roasted, wherein the anhydrous magnesium chloride and/or the magnesium chloride with N crystal water are preferably magnesium chloride hexahydrate.
2. A desiccant and a method for preparing the desiccant according to claim 1, wherein: comprises the following raw materials in parts by weight: 5-90 parts of magnesium oxide and/or magnesium hydroxide and 5-90 parts of magnesium chloride hexahydrate; 20-50 parts of alumina or clay, 0.1-20 parts of lignin or molecular sieve raw powder, 0.1-20 parts of carboxymethyl cellulose and 0.1-20 parts of glass fiber.
3. A desiccant and a method for preparing the desiccant according to claim 1, wherein: comprises the following raw materials in parts by weight: 10-60 parts of magnesium oxide and/or magnesium hydroxide and 40-90 parts of magnesium chloride hexahydrate; 10-30 parts of alumina or clay, 0.1-5 parts of lignin or molecular sieve raw powder, 0.1-5 parts of carboxymethyl cellulose and 0.1-5 parts of glass fiber.
4. A desiccant and a method for preparing the desiccant according to claim 1, wherein: comprises the following raw materials in parts by weight: 10-50 parts of magnesium oxide and/or magnesium hydroxide and 50-85 parts of magnesium chloride hexahydrate; 10-25 parts of alumina or clay, 0.1-2 parts of lignin or molecular sieve raw powder, 0.1-2 parts of carboxymethyl cellulose and 0.1-2 parts of glass fiber.
5. A desiccant and a method for preparing the desiccant according to claim 1, wherein: the raw materials comprise the following components in parts by weight: 10-40 parts of magnesium oxide and/or magnesium hydroxide and 50-80 parts of magnesium chloride hexahydrate; 10-20 parts of alumina or clay, 0.1-2 parts of lignin or molecular sieve raw powder, 0.1-2 parts of carboxymethyl cellulose and 0.1-2 parts of glass fiber.
6. A desiccant and a method for preparing the desiccant according to claim 1, wherein: the raw materials comprise the following components in parts by weight: 15-40 parts of magnesium oxide and/or magnesium hydroxide and 55-80 parts of magnesium chloride hexahydrate; 10-15 parts of alumina or clay, 0.1-1 part of lignin or molecular sieve raw powder, 0.1-1 part of carboxymethyl cellulose and 0.1-1 part of glass fiber.
7. A desiccant and a method for preparing the desiccant according to claim 1, wherein: the raw materials comprise the following components in parts by weight: 20-40 parts of magnesium oxide and/or magnesium hydroxide and 65-80 parts of magnesium chloride hexahydrate; 10-15 parts of alumina or clay, 0.5-1 part of lignin or molecular sieve raw powder, 0.5-1 part of carboxymethyl cellulose and 0.5-1 part of glass fiber.
8. A desiccant and a method for preparing the desiccant according to claim 1, wherein: the raw materials comprise the following components in parts by weight: 20-35 parts of magnesium oxide and 75-85 parts of magnesium chloride hexahydrate; 10-15 parts of alumina, 0.5-1 part of lignin, 0.5-1 part of carboxymethyl cellulose and 0.5-1 part of glass fiber.
9. A desiccant and a method for preparing the desiccant according to claim 1, wherein: the raw materials comprise the following components in parts by weight: 20-35 parts of magnesium carbonate and 75-85 parts of magnesium chloride hexahydrate; 0.5-1 part of lignin, 0.5-1 part of carboxymethyl cellulose and 0.5-1 part of glass fiber.
10. A desiccant and a method for preparing the desiccant according to claims 1-8, characterized in that: the method comprises the following steps:
1) selecting raw materials according to the weight percentage of the raw materials, and opening a discharge port of the powder mixer to discharge the materials;
2) after the powder mixing and stirring are finished, adding the mixed powder into a granulating machine, and adding water for granulating;
3) after granulation is finished, the formed particles are put into a vibrating screen for screening and polishing;
4) after polishing, drying the semi-finished product particles by a dryer, wherein the temperature distribution of the dryer is in a trapezoidal temperature rising trend of 80-120 ℃ from an inlet to an outlet of the dryer;
5) after drying, roasting the semi-finished product particles to prepare finished product particles, and roasting the dried semi-finished product particles in a roasting furnace, wherein the roasting temperature of the roasting furnace is 100-420 ℃ and is subjected to trapezoidal temperature rise, and the roasting time is about 2-4 hours, so that the semi-finished product particles can be completely fixed in shape to prepare finished product particles;
6) after completion of calcination, the desired desiccant particles are obtained.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112958044A (en) * | 2021-02-03 | 2021-06-15 | 杭州家爽包装材料有限公司 | Preparation method of drying agent and drying agent |
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