CN112473620A - Composite drying agent and preparation method and application thereof - Google Patents

Composite drying agent and preparation method and application thereof Download PDF

Info

Publication number
CN112473620A
CN112473620A CN202011373117.6A CN202011373117A CN112473620A CN 112473620 A CN112473620 A CN 112473620A CN 202011373117 A CN202011373117 A CN 202011373117A CN 112473620 A CN112473620 A CN 112473620A
Authority
CN
China
Prior art keywords
sodium sulfate
desiccant
potassium carbonate
montmorillonite
preparation
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.)
Pending
Application number
CN202011373117.6A
Other languages
Chinese (zh)
Inventor
许少欢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongguan Dingxing Industry Co ltd
Original Assignee
Dongguan Dingxing Industry Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dongguan Dingxing Industry Co ltd filed Critical Dongguan Dingxing Industry Co ltd
Priority to CN202011373117.6A priority Critical patent/CN112473620A/en
Publication of CN112473620A publication Critical patent/CN112473620A/en
Pending legal-status Critical Current

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
    • B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
    • B01J20/0277—Carbonates of compounds other than those provided for in B01J20/043
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
    • B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
    • B01D2259/40094—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating by applying microwaves
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The invention discloses a composite drying agent and a preparation method and application thereof, relates to the technical field of drying agents, and aims to solve the problem that most of the existing drying agents in the prior art can be used for the second time, but the drying agents need to be heated at high temperature for a long time, so that the cycle life is long. The weight ratio is as follows: 15-25% of potassium carbonate, 50-70% of montmorillonite and 15-25% of sodium sulfate, grinding and screening the montmorillonite, selecting 0.2-1 mu m of montmorillonite powder as a preparation raw material, drying the screened montmorillonite powder, controlling the drying temperature at 100-220 ℃, and preparing the potassium carbonate: carbonizing potassium hydroxide solution obtained after potassium chloride electrolysis in a carbonization tower by carbon dioxide, evaporating and filtering by a multi-effect evaporator to prepare potassium bicarbonate, and finally calcining to prepare potassium carbonate, wherein the sodium sulfate is prepared by the following steps: hydrogen is generatedSodium oxide reacts with sulfuric acid to produce sodium sulfate, the chemical reaction equation of which is: h2SO4+2NaOH→Na2SO4+2H2O。

Description

Composite drying agent and preparation method and application thereof
Technical Field
The invention relates to the technical field of drying agents, in particular to a composite drying agent and a preparation method and application thereof.
Background
Desiccants refer to substances that remove moisture from moist substances and are often classified into two categories: chemical desiccants, such as calcium sulfate and calcium chloride, dry by combining with water to form hydrates; physical drying agents, such as silica gel and activated alumina, dry by physically adsorbing water, and the management and control of moisture are closely related to the yield of products. In the case of food products, at the proper temperature and humidity, bacteria and mold in the food can multiply at an alarming rate, spoil the food, and cause moisture and color change. The electronic products can also produce defective products due to metal oxidation caused by overhigh humidity. The desiccant is used to avoid the generation of defective products caused by excessive moisture.
However, most of the existing drying agents can be used for the second time, but the drying agents need to be heated at high temperature for a long time, so that the cycle life is long; therefore, the existing requirements are not met, and a composite drying agent, a preparation method and application thereof are provided.
Disclosure of Invention
The invention aims to provide a composite desiccant as well as a preparation method and application thereof, which aim to solve the problem that most of the existing desiccants in the background art can be used for the second time, but the desiccant needs to be heated at high temperature for a long time, so that the cycle life is long.
In order to achieve the purpose, the invention provides the following technical scheme: a composite drying agent comprises the following components in parts by weight: 15-25% of potassium carbonate, 50-70% of montmorillonite and 15-25% of sodium sulfate.
A preparation method of the composite desiccant comprises the following steps:
the method comprises the following steps: grinding and screening montmorillonite, selecting 0.2-1 mu m montmorillonite powder as a preparation raw material, and drying the screened montmorillonite powder at the drying temperature of 100-220 ℃;
step two: preparation of potassium carbonate: carbonizing potassium hydroxide solution obtained after potassium chloride electrolysis in a carbonization tower by carbon dioxide, evaporating and filtering by a multi-effect evaporator to prepare potassium bicarbonate, and finally calcining to prepare potassium carbonate;
step three: preparing sodium sulfate: sodium hydroxide reacts with sulfuric acid to prepare sodium sulfate, and the chemical reaction equation is as follows: h2SO4+2NaOH→Na2SO4+2H2O；
Step four: mixing and stirring montmorillonite powder, potassium carbonate and sodium sulfate, adding an adhesive after uniformly stirring, and putting the mixture into a granulator to prepare desiccant particles with the particle size of 2.5-3 mm;
step five: heating the prepared desiccant particles in drying equipment for 15-20 min, and controlling the temperature at 120-180 ℃;
step six: and (3) filling the dried desiccant particles into non-woven fabric paper bags, and hermetically packaging the non-woven fabric paper bags, wherein the packaged weight is 5-6 g per bag.
Preferably, in the third step, the sodium sulfate needs to be dried after the preparation is finished, and the drying temperature is 130-150 ℃.
Preferably, in the fourth step, the montmorillonite powder, the potassium carbonate and the sodium sulfate need to be fed in three times during stirring, and the feeding ratio is 1:1:1 each time.
Preferably, in the fourth step, the adhesive is epoxy resin, the addition amount of the adhesive accounts for 2-3% of the total amount, and the adhesive can be used by matching with an ethanol solution.
Preferably, in the fourth step, the content of the internal material of the prepared desiccant particles is as follows: 14-24.5% of potassium carbonate, 48-69% of montmorillonite and 14-24.5% of sodium sulfate.
The application of the composite desiccant in a household storage cabinet as a desiccant.
Preferably, the hydrolysis reaction mode and the heating reduction reaction mode of the sodium sulfate are as follows:
Na2SO4+10H2O＝Na2SO4·10H2O；
Figure BDA0002806690090000021
preferably, the hydrolysis reaction mode and the heating reduction reaction mode of the potassium carbonate are as follows:
K2CO3+CO2+H2O＝2KHCO3；
Figure BDA0002806690090000031
compared with the prior art, the invention has the beneficial effects that:
1. the composite drying agent is placed in a clothes cabinet or a food storage cabinet, montmorillonite is used as the main component of the composite drying agent, the percentage of the montmorillonite is up to 50%, the montmorillonite expands after absorbing moisture, the molecular gap inside the montmorillonite is enlarged at the moment, interlayer water and absorbed water are removed by the montmorillonite when the temperature is 50-80 ℃, a large amount of moisture exists inside the composite drying agent at the moment, the moisture is rapidly absorbed by potassium carbonate and sodium sulfate inside the composite drying agent, the potassium carbonate and the sodium sulfate both have hydrolysis phenomena after contacting with the moisture, the hydrolysis substances are weak alkaline, the potassium carbonate, the sodium sulfate and the montmorillonite are prevented from being heated to 150 ℃ in a microwave oven after all the potassium carbonate, the sodium sulfate and the montmorillonite reach saturation points, the composite drying agent can be dehydrated, and the rapid dehydration operation is completed by replacing the montmorillonite, the potassium carbonate and the sodium sulfate, thereby being quickly put into secondary use at a lower temperature in a short time.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
The embodiment provided by the invention comprises the following steps: a composite drying agent comprises the following components in parts by weight: 15-25% of potassium carbonate, 50-70% of montmorillonite and 15-25% of sodium sulfate.
A preparation method of the composite desiccant comprises the following steps:
the method comprises the following steps: grinding and screening montmorillonite, selecting 0.2-1 mu m montmorillonite powder as a preparation raw material, and drying the screened montmorillonite powder at the drying temperature of 100-220 ℃;
step two: preparation of potassium carbonate: carbonizing potassium hydroxide solution obtained after potassium chloride electrolysis in a carbonization tower by carbon dioxide, evaporating and filtering by a multi-effect evaporator to prepare potassium bicarbonate, and finally calcining to prepare potassium carbonate;
step three: preparing sodium sulfate: sodium hydroxide reacts with sulfuric acid to prepare sodium sulfate, and the chemical reaction equation is as follows: h2SO4+2NaOH→Na2SO4+2H2O；
Step four: mixing and stirring montmorillonite powder, potassium carbonate and sodium sulfate, adding an adhesive after uniformly stirring, and putting the mixture into a granulator to prepare desiccant particles with the particle size of 2.5-3 mm;
step five: heating the prepared desiccant particles in drying equipment for 15-20 min, and controlling the temperature at 120-180 ℃;
step six: and (3) filling the dried desiccant particles into non-woven fabric paper bags, and hermetically packaging the non-woven fabric paper bags, wherein the packaged weight is 5-6 g per bag.
Further, in the third step, after the preparation of the sodium sulfate is finished, drying is also needed, and the drying temperature is 130-150 ℃.
Further, in the fourth step, while stirring, the montmorillonite powder, the potassium carbonate and the sodium sulfate need to be fed in three times, and the feeding ratio is 1:1:1 each time.
Further, in the fourth step, the adhesive is epoxy resin, the addition amount of the adhesive accounts for 2-3% of the total amount, and the adhesive can be matched with an ethanol solution for use.
Further, in the fourth step, the content of the internal material of the prepared desiccant particles is as follows: 14-24.5% of potassium carbonate, 48-69% of montmorillonite and 14-24.5% of sodium sulfate.
A composite desiccant is applied to a household storage cabinet as a desiccant, the composite desiccant is packaged in a clothes cabinet or a food storage cabinet, montmorillonite is used as a main component of the composite desiccant, the occupancy ratio is up to 50%, the molecular formula of the composite desiccant is (Na, Ca)0.33(Al, Mg)2[ Si4O10] (OH) 2. nH2O, the middle part is an aluminum octahedron, and the upper part and the lower part are clay minerals with a three-layer sheet structure consisting of silicon-oxygen tetrahedron, when the montmorillonite absorbs moisture, the montmorillonite expands, the internal molecular gap is enlarged, when the temperature is 50-80 ℃, the montmorillonite removes interlayer water and absorbs water, at the moment, a large amount of moisture appears in the composite desiccant, when the potassium carbonate and the sodium sulfate in the composite desiccant rapidly absorb the moisture, the potassium carbonate and the sodium sulfate both have hydrolysis phenomenon after the potassium carbonate and the sodium sulfate contact with the moisture, and the hydrolyzed substances are in alkalescence, when the potassium carbonate and sodium sulfate and montmorillonite all reach the saturation point, the composite desiccant can be dehydrated by preventing it from being heated to 150 ℃ in a microwave oven.
Further, the hydrolysis reaction mode and the heating reduction reaction mode of the sodium sulfate are as follows:
Na2SO4+10H2O＝Na2SO4·10H2O；
Figure BDA0002806690090000051
TABLE 1 solubility of sodium sulfate as a function of temperature Table
Temperature of 0 10 20 30 40 60 80 100
Solubility in water 107.0 109.0 110.0 114.0 117.0 126.0 139.0 156.0
Further, the hydrolysis reaction mode and the heating reduction reaction mode of the potassium carbonate are as follows:
K2CO3+CO2+H2O＝2KHCO3；
Figure BDA0002806690090000052
TABLE 2 solubility of potassium carbonate as a function of temperature Table
Figure BDA0002806690090000053
The working principle is as follows: when the montmorillonite powder is used, grinding and screening montmorillonite, selecting 0.2-1 mu m montmorillonite powder as a preparation raw material, drying the screened montmorillonite powder, controlling the drying temperature at 100-220 ℃, and preparing potassium carbonate: carbonizing potassium hydroxide solution obtained after potassium chloride electrolysis in a carbonization tower by carbon dioxide, evaporating and filtering by a multi-effect evaporator to prepare potassium bicarbonate, and finally calcining to prepare potassium carbonate, wherein the sodium sulfate is prepared by the following steps: sodium hydroxide reacts with sulfuric acid to prepare sodium sulfate, and the chemical reaction equation is as follows: h2SO4+2NaOH→Na2SO4+2H2O, mixing and stirring the montmorillonite powder, the potassium carbonate and the sodium sulfate, adding the adhesive after uniformly stirring, and putting the mixture into the reactorPreparing desiccant particles with the particle size of 2.5-3 mm in a granulator, heating the prepared desiccant particles in drying equipment for 15-20 min at 120-180 ℃, filling the dried desiccant particles into non-woven fabric paper bags, hermetically packaging the non-woven fabric paper bags with the weight of 5-6 g per bag, placing the composite desiccant bags in a clothes cabinet or a food storage cabinet, taking montmorillonite as a main component of the composite desiccant, wherein the occupancy ratio is up to 50%, and the molecular formula of the composite desiccant is (Na, Ca)0.33(Al, Mg)2[ Si4O10]](OH) 2. nH2O, wherein the middle part is an octahedral aluminous structure, and the upper part and the lower part are clay minerals with a three-layer sheet structure consisting of silicon-oxygen tetrahedrons, montmorillonite can expand after absorbing water, the internal molecular gap is increased at the moment, montmorillonite removes interlayer water and absorbed water at the temperature of 50-80 ℃, a large amount of water can appear in the composite drying agent at the moment, the water can be rapidly absorbed by potassium carbonate and sodium sulfate in the composite drying agent, the potassium carbonate and the sodium sulfate can be hydrolyzed after contacting with the water, the hydrolyzed substances are alkalescent, and when the potassium carbonate, the sodium sulfate and the montmorillonite all reach saturation points, the potassium carbonate, the sodium sulfate and the montmorillonite are prevented from being heated to 150 ℃ in a microwave oven, so that the composite drying agent can be dehydrated.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (9)

1. The composite drying agent is characterized by comprising the following components in parts by weight: 15-25% of potassium carbonate, 50-70% of montmorillonite and 15-25% of sodium sulfate.
2. The preparation method of the composite drying agent is characterized by comprising the following steps:
the method comprises the following steps: grinding and screening montmorillonite, selecting 0.2-1 mu m montmorillonite powder as a preparation raw material, and drying the screened montmorillonite powder at the drying temperature of 100-220 ℃;
step two: preparation of potassium carbonate: carbonizing potassium hydroxide solution obtained after potassium chloride electrolysis in a carbonization tower by carbon dioxide, evaporating and filtering by a multi-effect evaporator to prepare potassium bicarbonate, and finally calcining to prepare potassium carbonate;
step three: preparing sodium sulfate: sodium hydroxide reacts with sulfuric acid to prepare sodium sulfate, and the chemical reaction equation is as follows: h2SO4+2NaOH→Na2SO4+2H2O；
Step four: mixing and stirring montmorillonite powder, potassium carbonate and sodium sulfate, adding an adhesive after uniformly stirring, and putting the mixture into a granulator to prepare desiccant particles with the particle size of 2.5-3 mm;
step five: heating the prepared desiccant particles in drying equipment for 15-20 min, and controlling the temperature at 120-180 ℃;
step six: and (3) filling the dried desiccant particles into non-woven fabric paper bags, and hermetically packaging the non-woven fabric paper bags, wherein the packaged weight is 5-6 g per bag.
3. The composite desiccant and the preparation method thereof according to claim 2, wherein: in the third step, the sodium sulfate needs to be dried after the preparation is finished, and the drying temperature is 130-150 ℃.
4. The composite desiccant and the preparation method thereof according to claim 2, wherein: in the fourth step, the montmorillonite powder, the potassium carbonate and the sodium sulfate are required to be fed for three times during stirring, and the feeding ratio is 1:1:1 each time.
5. The composite desiccant and the preparation method thereof according to claim 2, wherein: in the fourth step, the adhesive is epoxy resin, the addition amount of the adhesive accounts for 2-3% of the total amount, and the adhesive can be matched with an ethanol solution for use.
6. The composite desiccant and the preparation method thereof according to claim 2, wherein: in the fourth step, the content of the internal materials of the prepared desiccant particles is as follows: 14-24.5% of potassium carbonate, 48-69% of montmorillonite and 14-24.5% of sodium sulfate.
7. Use of a composite desiccant according to claim 1 as a desiccant in a household storage cabinet.
8. Use of a composite desiccant as a desiccant in household storage cabinets according to claim 7, wherein: the hydrolysis reaction mode and the heating reduction reaction mode of the sodium sulfate are as follows:
Na2SO4+10H2O＝Na2SO4·10H2O；
Figure FDA0002806690080000021
9. use of a composite desiccant as a desiccant in household storage cabinets according to claim 7, wherein: the hydrolysis reaction mode and the heating reduction reaction mode of the potassium carbonate are as follows:
K2CO3+CO2+H2O＝2KHCO3；
Figure FDA0002806690080000022
CN202011373117.6A 2020-11-30 2020-11-30 Composite drying agent and preparation method and application thereof Pending CN112473620A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011373117.6A CN112473620A (en) 2020-11-30 2020-11-30 Composite drying agent and preparation method and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011373117.6A CN112473620A (en) 2020-11-30 2020-11-30 Composite drying agent and preparation method and application thereof

Publications (1)

Publication Number Publication Date
CN112473620A true CN112473620A (en) 2021-03-12

Family

ID=74937511

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011373117.6A Pending CN112473620A (en) 2020-11-30 2020-11-30 Composite drying agent and preparation method and application thereof

Country Status (1)

Country Link
CN (1) CN112473620A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1118266A1 (en) * 2000-01-21 2001-07-25 Societa Sarda Di Bentonite S.p.A. A granular absorbent material for pet litters
CN1559665A (en) * 2004-03-09 2005-01-05 杜建中 Concave-convex rod clay composite drying agent
CN105597665A (en) * 2016-03-27 2016-05-25 张耀忠 Bentonite drying agent
CN106890618A (en) * 2017-04-11 2017-06-27 明光市安盛非金属材料厂 A kind of preparation method of attapulgite ore drier
CN108031434A (en) * 2018-01-22 2018-05-15 建昌县建元澎润土有限责任公司 A kind of production method of bentonite and calcium chloride composite drying agent

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1118266A1 (en) * 2000-01-21 2001-07-25 Societa Sarda Di Bentonite S.p.A. A granular absorbent material for pet litters
CN1559665A (en) * 2004-03-09 2005-01-05 杜建中 Concave-convex rod clay composite drying agent
CN105597665A (en) * 2016-03-27 2016-05-25 张耀忠 Bentonite drying agent
CN106890618A (en) * 2017-04-11 2017-06-27 明光市安盛非金属材料厂 A kind of preparation method of attapulgite ore drier
CN108031434A (en) * 2018-01-22 2018-05-15 建昌县建元澎润土有限责任公司 A kind of production method of bentonite and calcium chloride composite drying agent

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
傅国飞等: "蒙脱石粘土干燥剂初步研制", 《江苏地质》 *
查正根编著: "《有机化学实验》", 31 August 2019, 中国科学技术大学出版社第2版 *

Similar Documents

Publication Publication Date Title
CN101362073A (en) Preparation method of acidification sludge bentonite granules
WO2024027044A1 (en) Preparation method for high-adsorption-capacity granular aluminum salt lithium extraction adsorbent
CN103818939B (en) Hydrogen peroxide fluid bed special aluminium oxide and production technology
CN103721533A (en) Deoxidizing and drying agent and preparation method thereof
CN101402475B (en) Process for producing magnesium oxide/absorbent charcoal composite material and uses thereof
CN103232065B (en) Method for recycling before-kiln dehydration filtrate and method for producing titanium dioxide
CN103964432A (en) Method for preparing granular activated carbon from lignin
CN102847417A (en) Air desiccant
CN105236407A (en) Double-layer capacitor electrode spherical active carbon material preparation method
CN105885300A (en) Novel environment-friendly PVC (polyvinyl chloride) heat stabilizer
WO2022183776A1 (en) Composite type-a molecular sieve raw powder containing wave-absorbing material, full-zeolite molecular sieve, preparation method therefor, and application thereof
CN113368808A (en) Lithium ion sieve using waste lithium manganate battery material as raw material and preparation method thereof
CN112473620A (en) Composite drying agent and preparation method and application thereof
CN109692663A (en) A kind of adsorbent and preparation method thereof utilized for Ammonia recovery
CN104432407A (en) Water film oxygen absorbent and preparation method thereof
CN103638789A (en) Production process of chemical drying agent
CN106492742A (en) A kind of novel dehumidifying agent and preparation method thereof
CN103055665A (en) Quick lime desiccant and production process thereof
CN102294221A (en) Preparation method of attapulgite-based adsorption drying agent suitable for high humidity environment
CN101104669A (en) Method for preparing water-loss reducer by organic-inorganic copolymerization
CN107999136A (en) A kind of preparation method of solid phase catalyst without mercury for VCM synthesis
CN101961593A (en) Dissolved type gas drying material and preparation method thereof
CN105021024B (en) A kind of method of depth drying lithium ion battery powder material
CN101104664A (en) Method for preparing water-loss reducer from crylic acid and acrylamide
CN103721534A (en) Deoxidizing and drying agent for instruments and meters and preparation method thereof

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
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20210312