CN110756154A - Calcium oxide desiccant with geometric shape and preparation method thereof - Google Patents
Calcium oxide desiccant with geometric shape and preparation method thereof Download PDFInfo
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- CN110756154A CN110756154A CN201810852384.8A CN201810852384A CN110756154A CN 110756154 A CN110756154 A CN 110756154A CN 201810852384 A CN201810852384 A CN 201810852384A CN 110756154 A CN110756154 A CN 110756154A
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- calcium oxide
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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
- B01J20/04—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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- 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
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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
- 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
- B01J20/28019—Spherical, ellipsoidal or cylindrical
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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
- B01J20/3028—Granulating, agglomerating or aggregating
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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
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/112—Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
- B01D2253/1124—Metal oxides
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- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Drying Of Gases (AREA)
Abstract
The invention discloses a calcium oxide drying agent with a geometric shape and a preparation method thereof. The calcium oxide desiccant with geometry is made of the following components by weight: 65-80% of calcium carbonate, 20-30% of halloysite and 5% of montmorillonite. The calcium oxide drying agent with the geometric shape has super-strong water absorption capacity which can reach more than 50 percent of the self weight.
Description
Technical Field
The invention relates to a drying agent and a preparation method thereof, in particular to a calcium oxide drying agent with a geometric shape and a preparation method thereof.
Background
The desiccant is an adsorbent capable of adsorbing moisture, and mainly comprises chemical desiccants, such as calcium sulfate, calcium chloride and the like, which are dried by combining with water to generate hydrates; and physical desiccants such as silica gel and activated alumina, which are dried by physically adsorbing water. The control of moisture is closely related with the yield of product, and the use of drier is just for avoiding unnecessary moisture to cause the emergence of defective products.
The main component of the calcium oxide desiccant is calcium oxide, and the water absorption capacity of the calcium oxide desiccant is realized by combining with water to generate hydrate, so that the water absorption is irreversible. The calcium oxide desiccant can keep the water absorption capacity of more than 35% of the self weight regardless of the humidity of the external environment, has excellent water absorption effect and is low in price.
Disclosure of Invention
The invention aims to provide a calcium oxide drying agent with strong water absorption capacity and a geometric shape and a preparation method thereof.
In one aspect of the invention, there is provided a calcium oxide desiccant having a geometry, the calcium oxide desiccant being made from the following components by weight:
65 to 80 percent of calcium carbonate,
halloysite 15% -30%, and
5 percent of montmorillonite.
In an embodiment of the invention, the calcium oxide desiccant is spherical.
In an embodiment of the invention, the calcium oxide desiccant has a water absorption capacity of greater than 50% of its own weight in an environment of 90% humidity at 25 ℃.
In another aspect of the invention, there is provided a method for preparing a calcium oxide desiccant having a geometric shape, the method comprising:
mixing the following components by weight: 65-80% of calcium carbonate, 15-30% of halloysite and 5% of montmorillonite;
granulating the mixture;
pre-drying the granules to a moisture content of less than 15%; and
and drying the pre-dried particles at 900-1200 ℃ to obtain the calcium oxide drying agent.
In an embodiment of the invention, the method further comprises a step of sieving the mixture after the granulating step and before the pre-drying step.
The calcium oxide drying agent with the geometric shape has super-strong water absorption capacity which can reach more than 50 percent of the self weight.
Drawings
FIG. 1 is a photograph showing the calcium oxide desiccant prepared in example 1;
fig. 2 is a photograph showing the calcium oxide desiccant prepared in comparative example 1.
Detailed Description
The invention provides a calcium oxide desiccant with strong water absorption capacity and a geometric shape, which is prepared from the following components in parts by weight: 65-80% of calcium carbonate, 15-30% of halloysite and 5% of montmorillonite.
In a preferred embodiment, the calcium oxide desiccant is made from the following components by weight: 75% of calcium carbonate, 20% of halloysite and 5% of montmorillonite.
Since calcium oxide swells when it contacts water, it is difficult to mold it and is easily pulverized even after molding, and thus, existing calcium oxide desiccants are in the form of powder. However, due to the use of the above components, the calcium oxide desiccant of the present invention is easily molded and can be formed into various geometric shapes such as a spherical shape, a rectangular parallelepiped shape, a square shape, an oval shape, etc. by molding techniques known in the art, such as granulation by a pelletizer. The calcium oxide desiccant of the present invention having a geometric shape such as a sphere maintains its spherical form after absorbing water, and does not pulverize.
The present invention also provides a method for preparing a calcium oxide desiccant having a geometric shape, comprising:
mixing the following components by weight: 65-80% of calcium carbonate, 15-30% of halloysite and 5% of montmorillonite;
granulating the mixture;
pre-drying the granules to a moisture content of less than 15%; and
and drying the pre-dried particles at 900-1200 ℃ to obtain the calcium oxide drying agent.
The mixing step may be any mixing method known in the art, such as stirring. The pre-drying step may use a known method, and may be, for example, drying in a low-temperature oven or drying with a belt dryer. The drying step may be performed in a high temperature oven.
In order to meet the requirements on particle size (e.g. particle size in the range of 1-1.5mm or 1.6-2.5 mm), the particles may also be sieved after the granulation step. Methods of screening particles are known to those skilled in the art.
The invention is further described by the following examples.
Example 1
Putting 75% of calcium carbonate, 20% of halloysite and 5% of montmorillonite by weight into a horizontal powder mixer, stirring for 1 hour, granulating through a granulator, sieving the semi-finished product to ensure that the particle size is within the range of 1-1.5mm, pre-drying in a low-temperature oven until the water content is lower than 15%, and drying at 1000 ℃ to obtain the calcium oxide desiccant.
Example 2
Adding 65% of calcium carbonate, 30% of halloysite and 5% of montmorillonite by weight into a horizontal powder mixer, stirring for 1 hour, granulating through a granulator, sieving the semi-finished product to ensure that the particle size is within the range of 1-1.5mm, pre-drying in a low-temperature oven until the water content is lower than 15%, and drying at 900 ℃ to obtain the calcium oxide drying agent.
Example 3
Adding 80% of calcium carbonate, 15% of halloysite and 5% of montmorillonite by weight into a horizontal powder mixer, stirring for 1 hour, granulating through a granulator, sieving the semi-finished product to ensure that the particle size is within the range of 1-1.5mm, pre-drying in a low-temperature oven until the water content is lower than 15%, and drying at 1200 ℃ to obtain the calcium oxide drying agent.
Comparative example 1
Putting 75% of calcium carbonate and 25% of halloysite into a horizontal powder mixer by weight, stirring for 1 hour, granulating through a granulator, screening the semi-finished product to ensure that the particle size is within the range of 1-1.5mm, pre-drying in a low-temperature oven until the water content is lower than 15%, and drying at 1000 ℃ to obtain the calcium oxide drying agent.
Comparative example 2
Putting 75% of calcium carbonate, 21% of halloysite and 4% of montmorillonite by weight into a horizontal powder mixer, stirring for 1 hour, granulating through a granulator, sieving the semi-finished product to ensure that the particle size is within the range of 1-1.5mm, pre-drying in a low-temperature oven until the water content is lower than 15%, and drying at 1000 ℃ to obtain the calcium oxide desiccant.
Comparative example 3
Putting 75% of calcium carbonate, 19% of halloysite and 6% of montmorillonite by weight into a horizontal powder mixer, stirring for 1 hour, granulating through a granulator, sieving the semi-finished product to ensure that the particle size is within the range of 1-1.5mm, pre-drying in a low-temperature oven until the water content is lower than 15%, and drying at 1000 ℃ to obtain the calcium oxide desiccant.
Determination of Water absorption Capacity
An appropriate amount of the calcium oxide desiccant of examples 1 to 3 and comparative examples 1 to 3 was put into a porcelain crucible, then put into a high-temperature furnace and kept at a constant temperature of 550 ℃ until the weight of the calcium oxide desiccant did not change, the weight was recorded, then the porcelain crucible was taken out, put into a constant-temperature incubator at 25 ℃ and a humidity of 90% for 12 hours, weighed and the water absorption capacity was calculated. The water absorption capacity results are shown in table 1 below.
TABLE 1
In the table "-" indicates that the water-absorbing capacity was not measured because the intact spherical calcium oxide desiccant was not formed.
The results of Table 1 show that dispersed, intact spherical calcium oxide desiccants were obtained in examples 1-3, and that they have a water absorption capacity of more than 50% of their own weight at 25 ℃ and 90% humidity, and have a strong water absorption capacity, whereas dispersed, intact spherical calcium oxide desiccants were not formed in comparative examples 1-3.
Claims (7)
1. A calcium oxide desiccant having a geometric shape made from the following components by weight:
65 to 80 percent of calcium carbonate,
halloysite 15% -30%, and
5 percent of montmorillonite.
2. The calcium oxide desiccant of claim 1, wherein the calcium oxide desiccant is spherical.
3. The calcium oxide desiccant of claim 1, wherein the calcium oxide desiccant has a water absorption capacity greater than 50% of its own weight in a 90% humidity environment at 25 ℃.
4. A method for preparing a calcium oxide desiccant having a geometric shape, comprising:
mixing the following components by weight: 65-80% of calcium carbonate, 15-30% of halloysite and 5% of montmorillonite;
granulating the mixture;
pre-drying the granules to a moisture content of less than 15%; and
and drying the pre-dried particles at 900-1200 ℃ to obtain the calcium oxide drying agent.
5. The method according to claim 4, characterized in that it further comprises, after said granulation step and before said pre-drying step, a step of sieving the mixture.
6. The method of claim 4 or 5, wherein the calcium oxide desiccant is spherical.
7. The method of claim 6, wherein the calcium oxide desiccant has a water absorption capacity greater than 50% of its own weight at 25 ℃ in a 90% humidity environment.
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| CN201810852384.8A CN110756154B (en) | 2018-07-26 | 2018-07-26 | Calcium oxide desiccant with geometric shape and preparation method thereof |
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| CN201810852384.8A CN110756154B (en) | 2018-07-26 | 2018-07-26 | Calcium oxide desiccant with geometric shape and preparation method thereof |
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| CN110756154A true CN110756154A (en) | 2020-02-07 |
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Citations (6)
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|---|---|---|---|---|
| US20040106721A1 (en) * | 2002-07-26 | 2004-06-03 | Soerens Dave Allen | Absorbent binder desiccant composition and articles incorporating it |
| CN101628221A (en) * | 2008-07-15 | 2010-01-20 | 郑州天祥无机材料有限公司 | Spherical calcium oxide adsorbent and preparation method thereof |
| CN101961638A (en) * | 2010-10-22 | 2011-02-02 | 浙江大学 | Method for preparing wear-resistant nano calcium oxide-based carbon dioxide reaction adsorbent |
| CN102949978A (en) * | 2011-08-30 | 2013-03-06 | 金松 | Spherical calcium oxide adsorbent and preparation method thereof |
| CN105854534A (en) * | 2016-05-21 | 2016-08-17 | 洪其祥 | Safe desiccant |
| CN107497258A (en) * | 2017-09-30 | 2017-12-22 | 徐州市伟华炉料有限公司 | A kind of Quick lime desiccant and preparation method thereof |
-
2018
- 2018-07-26 CN CN201810852384.8A patent/CN110756154B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040106721A1 (en) * | 2002-07-26 | 2004-06-03 | Soerens Dave Allen | Absorbent binder desiccant composition and articles incorporating it |
| CN101628221A (en) * | 2008-07-15 | 2010-01-20 | 郑州天祥无机材料有限公司 | Spherical calcium oxide adsorbent and preparation method thereof |
| CN101961638A (en) * | 2010-10-22 | 2011-02-02 | 浙江大学 | Method for preparing wear-resistant nano calcium oxide-based carbon dioxide reaction adsorbent |
| CN102949978A (en) * | 2011-08-30 | 2013-03-06 | 金松 | Spherical calcium oxide adsorbent and preparation method thereof |
| CN105854534A (en) * | 2016-05-21 | 2016-08-17 | 洪其祥 | Safe desiccant |
| CN107497258A (en) * | 2017-09-30 | 2017-12-22 | 徐州市伟华炉料有限公司 | A kind of Quick lime desiccant and preparation method thereof |
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Effective date of registration: 20220801 Address after: No. 188-5, Fuwen village, Fuwen Township, Chun'an County, Hangzhou City, Zhejiang Province, 311700 Applicant after: Hangzhou Yuanye New Material Co.,Ltd. Address before: No.173, Yangtang West Road, Jiuxian street, Tonglu County, Hangzhou City, Zhejiang Province, 311599 Applicant before: Tonglu Bates Technology Co.,Ltd. |
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