CN114560952A - Method for preparing novel cellulose chelating agent by using straw cellulose - Google Patents
Method for preparing novel cellulose chelating agent by using straw cellulose Download PDFInfo
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- CN114560952A CN114560952A CN202210186720.6A CN202210186720A CN114560952A CN 114560952 A CN114560952 A CN 114560952A CN 202210186720 A CN202210186720 A CN 202210186720A CN 114560952 A CN114560952 A CN 114560952A
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- 239000001913 cellulose Substances 0.000 title claims abstract description 54
- 229920002678 cellulose Polymers 0.000 title claims abstract description 54
- 239000010902 straw Substances 0.000 title claims abstract description 53
- 239000002738 chelating agent Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 239000000376 reactant Substances 0.000 claims abstract description 17
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000006266 etherification reaction Methods 0.000 claims abstract description 9
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical compound CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 claims abstract description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 46
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 238000011033 desalting Methods 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 12
- 235000007164 Oryza sativa Nutrition 0.000 claims description 11
- 241000209140 Triticum Species 0.000 claims description 11
- 235000021307 Triticum Nutrition 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 235000009566 rice Nutrition 0.000 claims description 11
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 claims description 7
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 claims description 5
- 235000013922 glutamic acid Nutrition 0.000 claims description 5
- 239000004220 glutamic acid Substances 0.000 claims description 5
- 238000006386 neutralization reaction Methods 0.000 claims description 5
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 claims 1
- 240000007594 Oryza sativa Species 0.000 claims 1
- 229910021645 metal ion Inorganic materials 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 29
- 241000209094 Oryza Species 0.000 description 10
- 239000011265 semifinished product Substances 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 235000013619 trace mineral Nutrition 0.000 description 3
- 239000011573 trace mineral Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 241000607479 Yersinia pestis Species 0.000 description 2
- 239000003242 anti bacterial agent Substances 0.000 description 2
- 229940088710 antibiotic agent Drugs 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000010414 supernatant solution Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- KUBDPQJOLOUJRM-UHFFFAOYSA-N 2-(chloromethyl)oxirane;4-[2-(4-hydroxyphenyl)propan-2-yl]phenol Chemical group ClCC1CO1.C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 KUBDPQJOLOUJRM-UHFFFAOYSA-N 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000021049 nutrient content Nutrition 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000003352 sequestering agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B11/00—Preparation of cellulose ethers
- C08B11/02—Alkyl or cycloalkyl ethers
- C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
- C08B11/08—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals with hydroxylated hydrocarbon radicals; Esters, ethers, or acetals thereof
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention relates to the technical field of metal ion chelating agents, in particular to a method for preparing a novel cellulose chelating agent by using straw cellulose, which comprises the following steps: s1, raw material pretreatment, namely selecting raw materials and crushing the raw materials; s2, etherification reaction, namely adding reactants in proportion and stirring, controlling the temperature by using a cooling device, sequentially adding epoxy chloropropane and dimethyl sulfoxide to react, heating the reactants, controlling the temperature to be 1-2 ℃ per minute, stopping heating when the temperature rises to 55 ℃, slowly heating the reactants, and finally controlling the temperature to be 60-80 ℃ to react.
Description
Technical Field
The invention relates to the technical field of metal ion chelating agents, in particular to a method for preparing a novel cellulose chelating agent by using straw cellulose.
Background
China is a big agricultural country, wheat, corn, rice and other yields are in the forefront of the world, and a large amount of straws are also produced. At present, the yield of crop straws reaches 9 hundred million tons, wherein the yield of crop straws accounts for 70 percent, the straw treatment is always a big problem, the traditional straw treatment mode is mainly in-situ incineration, a large amount of nutrient resources in the straws are wasted, and the atmospheric pollution is increased. In recent years, the straw resource utilization in China has various ways, including straw fertilizing, straw fuel processing, straw raw material processing, straw feed processing and straw base processing, wherein straw returning is the most common and effective method, and the method has the functions of improving the soil structure, reducing the soil hydrothermal condition and the like, and greatly improves the recovery utilization rate of the straw. However, the straw returning has the problems that pests and diseases remained in the straw form harmful organism accumulation, heavy metals, antibiotics and other potential environmental risk factors exist due to excessive accumulation of the remained straw, the effective nutrient content in the crop straw is less, and the like.
The straw mainly takes cellulose as a main component, the cellulose contains a large number of active groups, and the cellulose chelating agent with special functions can be prepared in a chemical modification mode, can be used for sewage treatment, heavy metal adsorption in wastewater, preparation of medium trace element water soluble fertilizer and other purposes, is rich in straw resources generated by crops such as rice, wheat and the like in China, is low in cost, can be used as a raw material for preparing the cellulose chelating agent, and does not form industrially produced cellulose chelating agent in the market at present.
Therefore, a method for preparing a novel cellulose chelating agent by using straw cellulose is needed to improve the problems.
Disclosure of Invention
The invention aims to provide a method for preparing a novel cellulose chelating agent by using straw cellulose, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for preparing a novel cellulose chelating agent by using straw cellulose comprises the following steps of:
s1, raw material pretreatment, namely selecting raw materials and crushing the raw materials;
s2, etherification reaction, namely adding reactants in proportion, stirring, controlling the temperature by using a cooling device, sequentially adding epoxy chloropropane and dimethyl sulfoxide to react, heating the reactants, controlling the temperature to be 1-2 ℃ per minute, stopping heating when the temperature rises to 55 ℃, slowly heating the reactants, and finally controlling the temperature to be 60-80 ℃ to react;
s3, neutralization reaction: after the etherification reaction is finished, cooling the reaction system, finally cooling to 25-30 ℃, then adding the cooled reaction system into glutamic acid, uniformly stirring, neutralizing to ensure that the pH is 6-7, and reacting for 24 hours;
s4, desalting, drying and crushing: and (3) sequentially carrying out desalting and washing twice by using ethanol solutions with different concentrations, and drying and crushing after separating a product by using a centrifugal machine to obtain the cellulose chelating agent.
As a preferred embodiment of the present invention, in step S1, the raw material is straw of wheat and rice.
As the preferable scheme of the invention, the crushed straw has 1-30 meshes.
According to a preferable scheme of the invention, reactants added in the step S2 are tetraethylenepentamine and sodium hydroxide, the tetraethylenepentamine accounts for 5-15 parts, the sodium hydroxide accounts for 7 parts, the epoxy chloropropane accounts for 10-20 parts, and the dimethyl sulfoxide accounts for 5-15 parts.
In a preferred embodiment of the present invention, the reaction time in step S2 is 24 to 48 hours while the temperature is maintained at 60 to 80 ℃.
In a preferred embodiment of the present invention, the solutions used in the two desalting washes in step S4 are 75% to 80% ethanol solution and 65% to 75% ethanol solution, respectively.
As a preferable scheme of the invention, after the ethanol solution is added in the two desalting washes, the mixture is completely stirred and stood, and the time of the two times of standing is 2 hours and 1 hour respectively.
As a preferable embodiment of the present invention, the drying step in step S4 is performed under a vacuum environment.
Compared with the prior art, the invention has the beneficial effects that:
(1) the raw materials adopted by the invention are straw cellulose, the straws of wheat and rice are taken as the raw materials, and the straw-recycling agent has the characteristics of sufficient raw materials, low cost, environmental protection, easy adsorption and easy elution, greatly improves the recycling rate of the straws, and avoids the residual pests and diseases in straw returning to the field to form harmful organism accumulation and the residual straws having potential environmental risk factors such as heavy metal, antibiotics and the like due to excessive accumulation;
(2) the etherification reaction adopts a special semi-drying reaction, the prepared cellulose chelating agent has obvious chelating effect and high chelating property, and the prepared cellulose chelating agent can be used for sewage filtration, heavy metal treatment in wastewater, preparation of medium and trace element fertilizers and the like.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example one
A method for preparing a novel cellulose chelating agent by using straw cellulose comprises the following steps:
(1) and (3) carrying out round bale recovery on the rice or wheat straws, and crushing the rice or wheat straws into crude raw materials with 20-30 meshes.
(2) Weighing 100 parts of crude raw materials, adding 5 parts of tetraethylenepentamine and 7 parts of sodium hydroxide, starting stirring, controlling the temperature by using a cooling device, sequentially adding 10 parts of epoxy chloropropane and 5 parts of dimethyl sulfoxide to perform a semi-drying reaction, heating reactants at the same time, strictly controlling the temperature rise at 1-2 ℃ per minute, stopping heating when the temperature rises to 55 ℃, slowly raising the temperature, finally controlling the temperature at 60-80 ℃, and reacting for 24 hours.
(3) And after the etherification reaction is finished, cooling the reaction system, finally cooling to 25-30 ℃, adding a certain amount of glutamic acid for neutralization reaction, uniformly stirring to ensure that the pH value is 6-7, and reacting for 24 hours.
(4) And adding an ethanol solution into the semi-finished product for desalting and washing, wherein the mass fraction of the ethanol solution is 75-80%. After stirring completely and standing for 2h, the washing solution was separated using a centrifuge, and the ethanol solution was recovered. And adding 65-75% ethanol solution into the separated semi-finished product to perform secondary desalting and washing, completely stirring and standing for 1h, and separating and recovering the ethanol solution by using a centrifugal machine.
(5) And drying the reactant in vacuum to obtain the finished product of the cellulose chelating agent.
Example two
A method for preparing a novel cellulose chelating agent by using straw cellulose comprises the following steps:
(1) and (3) carrying out round bale recovery on the rice or wheat straws, and crushing the rice or wheat straws into crude raw materials with 20-30 meshes.
(2) Weighing 100 parts of crude raw materials, adding 10 parts of tetraethylenepentamine and 7 parts of sodium hydroxide, starting stirring, controlling the temperature by using a cooling device, sequentially adding 15 parts of epoxy chloropropane and 10 parts of dimethyl sulfoxide to perform a semi-drying reaction, heating reactants at the same time, strictly controlling the temperature rise to 1-2 ℃ per minute, stopping heating when the temperature rises to 55 ℃, slowly raising the temperature, finally controlling the temperature to 60-80 ℃, and reacting for 48 hours.
(3) And after the etherification reaction is finished, cooling the reaction system, finally cooling to 25-30 ℃, adding a certain amount of glutamic acid for neutralization reaction, uniformly stirring to ensure that the pH value is 6-7, and reacting for 24 hours.
(4) And adding an ethanol solution into the semi-finished product for desalting and washing, wherein the mass fraction of the ethanol solution is 75-80%. After stirring completely and standing for 2h, the washing solution was separated using a centrifuge and the ethanol solution was recovered. And adding 65-75% ethanol solution into the separated semi-finished product for secondary desalting and washing, completely stirring, standing for 1h, and separating and recovering the ethanol solution by using a centrifugal machine.
(5) And drying the reactant in vacuum to obtain the finished product of the cellulose chelating agent.
EXAMPLE III
A method for preparing a novel cellulose chelating agent by using straw cellulose comprises the following steps:
(1) and (3) carrying out round bale recovery on the rice or wheat straws, and crushing the rice or wheat straws into crude raw materials with 20-30 meshes.
(2) Weighing 100 parts of crude raw materials, adding 15 parts of tetraethylenepentamine and 7 parts of sodium hydroxide, starting stirring, controlling the temperature by using a cooling device, sequentially adding 20 parts of epoxy chloropropane and 15 parts of dimethyl sulfoxide to perform a semi-drying reaction, heating reactants at the same time, strictly controlling the temperature rise to 1-2 ℃ per minute, stopping heating when the temperature rises to 55 ℃, slowly raising the temperature, finally controlling the temperature to 60-80 ℃, and reacting for 48 hours.
(3) And after the etherification reaction is finished, cooling the reaction system, finally cooling to 25-30 ℃, adding a certain amount of glutamic acid for neutralization reaction, uniformly stirring to ensure that the pH value is 6-7, and reacting for 24 hours.
(4) And adding an ethanol solution into the semi-finished product for desalting and washing, wherein the mass fraction of the ethanol solution is 75-80%. After stirring completely and standing for 2h, the washing solution was separated using a centrifuge and the ethanol solution was recovered. And adding 65-75% ethanol solution into the separated semi-finished product to perform secondary desalting and washing, completely stirring and standing for 1h, and separating and recovering the ethanol solution by using a centrifugal machine.
(5) And drying the reactant in vacuum to obtain the finished product of the cellulose chelating agent.
Determination of degree of substitution
The cellulose chelate agents prepared in examples 1, 2 and 3 were sampled for 3 samples, and the results are shown in Table 1, wherein each sample was sampled every 5 t:
| sample (I) | Water content/%) | Degree of substitution | Purity/%) |
| Example 1 | 2.7 | 0.84 | 95.5 |
| Example 2 | 2.3 | 0.87 | 97.6 |
| Example 3 | 2.6 | 0.83 | 96.3 |
TABLE 1
As can be seen from Table 1, the cellulose sequestrants of the present invention all have a moisture content of less than 3%, a degree of substitution between 0.8 and 0.9, and a purity of greater than 95%.
Determination of chelating degree of Ca2+, Cu2+ and Mg2+
Preparing Ca2+, Cu2+ and Mg2+ solutions with certain concentration, respectively placing the solutions into 12 test tubes with 20ml, taking the cellulose chelating agents prepared in the examples 1, 2 and 3, preparing cellulose chelating agent solutions with certain concentration, taking 3 biological repetitions in each group, respectively taking 1ml of the solutions, adding 1ml of the aqueous solution into 9 test tubes, simultaneously adding 1ml of the aqueous solution into the remaining 3 test tubes as a control group, fully shaking at constant temperature for a period of time, respectively centrifuging the test tube solutions to obtain supernatant solutions, measuring the concentrations of Ca2+, Cu2+ and Mg2+ in the supernatant solutions, calculating the content of complex metal ions, and taking the average value of the three repetitions, wherein the mass ratio of the Ca 385 +, Cu2+ and Mg2+ is 2:
TABLE 2
As can be seen from the table, the cellulose chelating agent prepared by the method has good chelating effect on trace elements such as Ca2+, Cu2+, Mg2+ and the like, and the chelating effect is obviously superior to that of a control group.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A method for preparing a novel cellulose chelating agent by using straw cellulose comprises the following steps of:
s1, raw material pretreatment, namely selecting raw materials and crushing the raw materials;
s2, etherification reaction, namely adding reactants in proportion, stirring, controlling the temperature by using a cooling device, sequentially adding epoxy chloropropane and dimethyl sulfoxide to react, heating the reactants, controlling the temperature to be 1-2 ℃ per minute, stopping heating when the temperature rises to 55 ℃, slowly heating the reactants, and finally controlling the temperature to be 60-80 ℃ to react;
s3, neutralization reaction: after the etherification reaction is finished, cooling the reaction system, finally cooling to 25-30 ℃, then adding the cooled reaction system into glutamic acid, uniformly stirring, neutralizing to ensure that the pH is 6-7, and reacting for 24 hours;
s4, desalting, drying and crushing: and (3) sequentially carrying out desalting and washing twice by using ethanol solutions with different concentrations, separating a product by using a centrifugal machine, and drying and crushing to obtain the cellulose chelating agent.
2. The method for preparing the novel cellulose chelating agent by using the straw cellulose as claimed in claim 1, wherein the method comprises the following steps: in the step S1, the raw materials are straws of wheat and rice.
3. The method for preparing the novel cellulose chelating agent by using the straw cellulose as claimed in claim 2, wherein: the crushed straw has 1-30 meshes.
4. The method for preparing the novel cellulose chelating agent by using the straw cellulose as claimed in claim 1, wherein the method comprises the following steps: the reactants added in the step S2 are tetraethylenepentamine and sodium hydroxide, the tetraethylenepentamine accounts for 5-15 parts, the sodium hydroxide accounts for 7 parts, the addition amount of epichlorohydrin accounts for 10-20 parts, and the addition amount of dimethyl sulfoxide accounts for 5-15 parts.
5. The method for preparing the novel cellulose chelating agent by using the straw cellulose as claimed in claim 1, wherein: the reaction time in the step S2 is 24-48 h when the temperature is maintained at 60-80 ℃.
6. The method for preparing the novel cellulose chelating agent by using the straw cellulose as claimed in claim 1, wherein the method comprises the following steps: the solutions used in the two desalting and washing steps in the step S4 are 75% -80% ethanol solution and 65% -75% ethanol solution respectively.
7. The method for preparing the novel cellulose chelating agent by using the straw cellulose as claimed in claim 6, wherein: and (3) adding ethanol solution into the desalted and washed solution twice, completely stirring and standing the solution, wherein the standing time of the two times is 2 hours and 1 hour respectively.
8. The method for preparing the novel cellulose chelating agent by using the straw cellulose as claimed in claim 1, wherein the method comprises the following steps: the drying step in step S4 is performed under a vacuum environment.
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2022
- 2022-02-28 CN CN202210186720.6A patent/CN114560952A/en active Pending
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| CN105732204A (en) * | 2016-03-02 | 2016-07-06 | 盐城市友普环保科技有限公司 | Preparation method of ecological chelated straw fertilizer |
| WO2018181224A1 (en) * | 2017-03-29 | 2018-10-04 | 日本製紙株式会社 | Rubber composition and method for producing same |
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Application publication date: 20220531 |