CN116351386A - Preparation method of activated clay with improved decoloring capacity - Google Patents
Preparation method of activated clay with improved decoloring capacity Download PDFInfo
- Publication number
- CN116351386A CN116351386A CN202111627676.XA CN202111627676A CN116351386A CN 116351386 A CN116351386 A CN 116351386A CN 202111627676 A CN202111627676 A CN 202111627676A CN 116351386 A CN116351386 A CN 116351386A
- Authority
- CN
- China
- Prior art keywords
- bentonite
- drying
- activated clay
- water
- treatment
- 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
Links
- 239000004927 clay Substances 0.000 title claims abstract description 154
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 262
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 261
- 239000000440 bentonite Substances 0.000 claims abstract description 261
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 184
- 239000002253 acid Substances 0.000 claims abstract description 71
- 230000004913 activation Effects 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 63
- 238000001035 drying Methods 0.000 claims description 154
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 92
- 239000000463 material Substances 0.000 claims description 86
- 238000001816 cooling Methods 0.000 claims description 51
- 238000005406 washing Methods 0.000 claims description 46
- 239000000203 mixture Substances 0.000 claims description 45
- 238000004042 decolorization Methods 0.000 claims description 41
- 239000003921 oil Substances 0.000 claims description 28
- 239000012535 impurity Substances 0.000 claims description 20
- 239000004519 grease Substances 0.000 claims description 16
- 238000007670 refining Methods 0.000 claims description 10
- 239000003925 fat Substances 0.000 claims description 6
- 238000004332 deodorization Methods 0.000 claims description 4
- 239000011343 solid material Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 description 120
- 239000012065 filter cake Substances 0.000 description 95
- 239000000047 product Substances 0.000 description 63
- 238000001914 filtration Methods 0.000 description 61
- 238000003892 spreading Methods 0.000 description 49
- 238000001994 activation Methods 0.000 description 44
- 239000003549 soybean oil Substances 0.000 description 37
- 235000012424 soybean oil Nutrition 0.000 description 37
- 229910001220 stainless steel Inorganic materials 0.000 description 33
- 239000010935 stainless steel Substances 0.000 description 33
- 239000004576 sand Substances 0.000 description 29
- 239000004575 stone Substances 0.000 description 27
- 230000000052 comparative effect Effects 0.000 description 23
- 235000019198 oils Nutrition 0.000 description 23
- 239000000843 powder Substances 0.000 description 16
- 230000020477 pH reduction Effects 0.000 description 15
- 238000010298 pulverizing process Methods 0.000 description 6
- 230000003213 activating effect Effects 0.000 description 5
- 238000004061 bleaching Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000007873 sieving Methods 0.000 description 5
- 238000002791 soaking Methods 0.000 description 5
- 150000001768 cations Chemical class 0.000 description 3
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 3
- 229910052901 montmorillonite Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IUVCFHHAEHNCFT-INIZCTEOSA-N 2-[(1s)-1-[4-amino-3-(3-fluoro-4-propan-2-yloxyphenyl)pyrazolo[3,4-d]pyrimidin-1-yl]ethyl]-6-fluoro-3-(3-fluorophenyl)chromen-4-one Chemical compound C1=C(F)C(OC(C)C)=CC=C1C(C1=C(N)N=CN=C11)=NN1[C@@H](C)C1=C(C=2C=C(F)C=CC=2)C(=O)C2=CC(F)=CC=C2O1 IUVCFHHAEHNCFT-INIZCTEOSA-N 0.000 description 2
- -1 Cu 2+ Chemical class 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 235000021466 carotenoid Nutrition 0.000 description 2
- 150000001747 carotenoids Chemical class 0.000 description 2
- 229930002875 chlorophyll Natural products 0.000 description 2
- 235000019804 chlorophyll Nutrition 0.000 description 2
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 150000007522 mineralic acids Chemical class 0.000 description 2
- 235000014593 oils and fats Nutrition 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 229930195730 Aflatoxin Natural products 0.000 description 1
- XWIYFDMXXLINPU-UHFFFAOYSA-N Aflatoxin G Chemical compound O=C1OCCC2=C1C(=O)OC1=C2C(OC)=CC2=C1C1C=COC1O2 XWIYFDMXXLINPU-UHFFFAOYSA-N 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- FMMWHPNWAFZXNH-UHFFFAOYSA-N Benz[a]pyrene Chemical compound C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC=CC2=C1 FMMWHPNWAFZXNH-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- CQBLUJRVOKGWCF-UHFFFAOYSA-N [O].[AlH3] Chemical compound [O].[AlH3] CQBLUJRVOKGWCF-UHFFFAOYSA-N 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000005409 aflatoxin Substances 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000008157 edible vegetable oil Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000003904 phospholipids Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- B01J20/12—Naturally occurring clays or bleaching earth
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/10—Refining fats or fatty oils by adsorption
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/74—Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Microbiology (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Fats And Perfumes (AREA)
Abstract
The invention provides a preparation method of activated clay with improved decolorizing capacity. Specifically, the invention provides a preparation method of activated clay, which comprises the step of carrying out high-temperature treatment on bentonite; wherein the high temperature treatment is performed before the acid activation treatment, or after the acid activation treatment, or both before and after the acid activation treatment; wherein the temperature of the high-temperature treatment is 400-600 ℃. The activated clay prepared by the method has improved decoloring capacity, does not need to use a large amount of acid in the preparation process, and can greatly reduce the water consumption.
Description
Technical Field
The invention relates to a preparation method of activated clay with improved decolorizing capacity.
Background
Bentonite is a nonmetallic mineral product with montmorillonite as a main mineral component, and the montmorillonite structure is 2 composed of two silicon oxygen tetrahedrons which are sandwiched by one layer of aluminum oxygen octahedrons: type 1 crystal structure, the layered structure formed by montmorillonite unit cells having some cations such as Cu 2+ 、Mg 2+ 、Na + 、K + And the like, and the effect of the cations and montmorillonite cells is very unstable and is easy to be exchanged by other cations, so the montmorillonite cell has better ion exchange property. Foreign abroad has The method is applied to more than 100 departments in 24 fields of industrial and agricultural production, and more than 300 products exist, so that people are called as universal soil.
In the field of grease processing, activated clay is one of essential processing aids in the grease refining process, and can not only effectively adsorb pigments (carotenoid, chlorophyll) in grease and impurities (protein, phospholipid, saccharides and the like) in grease, but also remove harmful substances (such as benzopyrene, aflatoxin and the like) in grease. Therefore, the use of activated clay provides a guarantee for producing high-quality grease. Activated clay is prepared by activating bentonite with inorganic acid (generally sulfuric acid), washing with water and drying. The conventional activation process consumes a large amount of sulfuric acid (200-500 kg of 98% concentrated sulfuric acid is consumed per 1 ton of activated clay), and the water washing process produces a large amount of wastewater (30-80 tons of wastewater is produced per 1 ton of activated clay). For example, WZB bentonite is used as a raw material, and the amount of sulfuric acid used is more than 25% in order to obtain activated clay (Wu Zhu province, research on development of efficient activated clay for decolorization of edible oil and fat and its adsorption property, university of Shihe, 2006). CN 107827119A discloses a process for producing activated clay by two-stage activation process, which comprises the steps of activating at normal pressure and then activating under pressure, wherein the usage amount of sulfuric acid reaches 0.4 ton of sulfuric acid/ton of dry ore.
The current research method has large acid consumption and high production cost, and a large amount of acid waste liquid is generated in the preparation process, so that the environment is polluted.
Disclosure of Invention
The first aspect of the present invention provides a method for producing activated clay, comprising the step of subjecting bentonite to a high temperature treatment, wherein the high temperature treatment is performed before the acid activation treatment, after the acid activation treatment, or both before and after the acid activation treatment. The method can be used for improving the decoloring capacity of the activated clay.
In one or more embodiments, the high temperature treatment is at a temperature of 400 to 600 ℃.
In one or more embodiments, the high temperature treatment is at a temperature of 400 to 500 ℃.
In one or more embodiments, the time of the high temperature treatment is from 5 minutes to 300 minutes.
In one or more embodiments, the time of the high temperature treatment is from 30 minutes to 300 minutes. In one or more embodiments, the time of the high temperature treatment is from 30 minutes to 180 minutes.
In one or more embodiments, the time of the high temperature treatment is from 60 minutes to 120 minutes.
In one or more embodiments, the temperature of the high temperature treatment prior to the acid activation treatment is 400 to 600 ℃, preferably 400 to 500 ℃; the time of the high temperature treatment is 5 minutes to 300 minutes, preferably 30 minutes to 300 minutes, more preferably 30 minutes to 180 minutes, and still more preferably 60 minutes to 120 minutes.
In one or more embodiments, the temperature of the high temperature treatment after the acid activation treatment is 400 to 600 ℃, preferably 400 to 500 ℃; the time of the high temperature treatment is 5 minutes to 300 minutes, preferably 30 minutes to 300 minutes, more preferably 30 minutes to 180 minutes, and still more preferably 60 minutes to 120 minutes.
In one or more embodiments, the acid activation treatment is performed using sulfuric acid.
In one or more embodiments, the sulfuric acid is used in an amount of 1 to 5%, preferably 3 to 5% by mass of bentonite.
In one or more embodiments, the concentration of the sulfuric acid solution is 5-50%, such as 5-20%.
In one or more embodiments, the acid activation treatment time is from 30 minutes to 2 hours, preferably from 45 minutes to 90 minutes.
In one or more embodiments, the acid activation treatment is preceded by a high temperature treatment, followed by a water wash directly, or followed by a water wash after drying at a temperature below 400 ℃, such as below 350 ℃, or at a temperature of 100-200 ℃.
In one or more embodiments, the high temperature treatment is performed only after the acid activation treatment, wherein the bentonite sample is dried at less than 400 ℃, such as 300 ℃ or less, 200 ℃ or less, 150 ℃ or less, or 120 ℃ or less, before the acid activation treatment, and then the acid activation treatment is performed again, followed by the high temperature treatment, followed by cooling and water washing or directly water washing after the high temperature treatment.
In one or more embodiments, the water is added in an amount of 5 to 10 times the mass of bentonite upon washing.
In one or more embodiments, the water wash time is within 5 minutes to 1 hour.
In one or more embodiments, the solid material is obtained by filtration after washing with water, and then the water content is below 10% after drying the solid material
In one or more embodiments, the method further comprises the step of pre-treating the bentonite to remove impurities.
In some embodiments, the methods of the present invention comprise the steps of removing impurities, low temperature drying, pulverizing, acid activating treatment, high temperature treatment, cooling, water washing, and drying described herein in that order. In other embodiments, the methods of the present invention comprise the steps of removing impurities, high temperature treatment, pulverizing, acid activation treatment, water washing or low temperature drying followed by water washing, drying described herein in sequence. In other embodiments, the methods of the present invention comprise the steps of removing impurities, high temperature treatment, pulverizing, acid activation treatment, high temperature treatment, cold direct water wash or post-cooling water wash, and drying described herein in sequence.
In a second aspect, the invention provides activated clay prepared by a method according to any one of the embodiments of the invention.
In one or more embodiments, the activated clay has a moisture content of 10% or less, such as 7-10%.
In one or more embodiments, the activated clay has a pH of from 2.2 to 3.
In a third aspect, the present invention provides a decolorizing medium comprising activated clay prepared by the method of any of the embodiments of the present invention.
In a fourth aspect, the present invention provides the use of an activated clay prepared by a method according to any one of the embodiments of the present invention as a decolorizing medium in the refining of oils and fats, particularly in decolorizing.
In a fifth aspect, the present invention provides a method for decolorizing grease comprising the steps of preparing the activated clay using the method of any one of the present invention, and decolorizing grease using the clay.
In a sixth aspect, the present invention provides a method for refining oil, comprising the steps of preparing the activated clay by the method according to any one of the present invention, and decolorizing oil by the clay; preferably, the process further comprises one or more of degumming, deacidification, decolorization, deodorization and dewaxing.
In a seventh aspect, the present invention provides a method for preparing a blend oil, comprising a) a step of refining oil using the method of claim 9, and a step of preparing a blend oil using the oil obtained in step a).
Detailed Description
It is understood that within the scope of the present invention, the above-described technical features of the present invention and technical features specifically described below (e.g., in the examples) may be combined with each other to constitute a preferred technical solution.
The activated clay is an adsorbent which is prepared from clay (mainly bentonite) as a raw material through inorganic acidification treatment, water rinsing and drying, has the appearance of milky powder, is odorless, tasteless and nontoxic, has strong adsorption performance, and can adsorb colored substances, organic substances and the like.
The prior art considers that when the bentonite is acidified and dried, if the drying temperature is too high, the activated clay is seriously dehydrated, namely, the phenomenon of 'drying' the activated clay is generated, and the quality of the activated clay is influenced; the drying temperature is controlled to 150-200 deg.C. Contrary to the teaching of the prior art, the invention discovers that the high-temperature (400-600 ℃) calcination is carried out before and/or after the acid activation of bentonite, and the combination water between bentonite layers can be effectively removed to expose metal ions between bentonite layers on the premise of not damaging the original bentonite structure, thereby being beneficial to exchange with hydrogen ions during activation, not only avoiding the phenomenon of 'baking' the activated clay, but also improving the decoloring capability of the prepared activated clay, and greatly reducing the water consumption in the process.
The bleaching ability of activated clay herein refers to the ability of activated clay to remove pigments (including carotenoids, chlorophyll, etc.) from oils and fats. The bleaching ability of activated clay is expressed herein in terms of bleaching rate.
The method for preparing activated clay with improved decolorizing capacity comprises the step of carrying out high-temperature treatment on bentonite, wherein the high-temperature treatment is carried out before acid activation treatment, or is carried out after acid activation treatment, or is carried out before acid activation treatment and after acid activation treatment.
The temperature of the high temperature treatment is generally in the range of 400 to 600 ℃, preferably 400 to 500 ℃. The high temperature treatment may be carried out in conventional equipment such as a muffle furnace. The time of each high temperature treatment is generally controlled in the range of 5 minutes to 300 minutes, preferably 30 minutes to 300 minutes. In some embodiments, the time of the high temperature treatment is from 30 minutes to 180 minutes. Preferably, the time of the high temperature treatment is 60 minutes to 120 minutes.
In some embodiments, the temperature of the high temperature treatment prior to the acid activation treatment is 400-600 ℃, preferably 400-500 ℃; the time of the high temperature treatment is 5 minutes to 300 minutes, preferably 30 minutes to 300 minutes, more preferably 30 minutes to 180 minutes, and still more preferably 60 minutes to 120 minutes.
In some embodiments, the temperature of the high temperature treatment after the acid activation treatment is 400-600 ℃, preferably 400-500 ℃; the time of the high temperature treatment is 5 minutes to 300 minutes, preferably 30 minutes to 300 minutes, more preferably 30 minutes to 180 minutes, and still more preferably 60 minutes to 120 minutes.
In a particularly preferred embodiment, the present invention is subjected to the high temperature treatment described herein both before and after the acid activation treatment.
In the present invention, when the high temperature treatment is performed only before the acid activation treatment, the acid activation treatment may be directly followed by water washing, or the acid activation treatment may be followed by water washing after drying at a temperature lower than 400 ℃. In some embodiments, the drying is performed at a temperature below 350 ℃ followed by a water wash. The drying time is not particularly limited as long as moisture can be sufficiently removed, and is related to the amount of the material to be dried. Exemplary drying times may be 1-5 hours, such as 2-4 hours.
In the present invention, when the high temperature treatment is performed only after the acid activation treatment, if the bentonite sample to be treated is not dried, the sample may be dried at a temperature lower than 400 ℃, such as 300 ℃ or lower, 200 ℃ or lower, 150 ℃ or lower, or 120 ℃ before the acid activation treatment, and then the acid activation treatment is performed. The drying time is not particularly limited as long as the drying effect can be achieved, and can be determined according to the water content of the bentonite sample to be treated and the amount of the bentonite sample to be treated. Exemplary drying times may be 1-5 hours, such as 3-4 hours.
In the present invention, when the high temperature treatment is performed both before and after the acid activation treatment, the water washing is performed after the high temperature treatment after the acid activation treatment is completed. The material can be washed after being cooled to room temperature, or can be directly washed.
In the invention, the addition amount of water can be 5-10 times of the mass of bentonite during water washing. The water washing time is not limited and is usually within 5 minutes to 1 hour.
After washing with water, the solid material is filtered and then dried at conventional temperatures (e.g., 100-150 ℃) to a moisture content of less than 10%, thereby obtaining the activated clay described herein. The dried material may be crushed to a particle size that passes through, for example, a 200 mesh screen.
Here, the acid activation treatment may be performed by a conventional method. Bentonite can be crushed before the acid activation treatment. For example, the crushed bentonite may pass through a 200 mesh screen. The acid may be an inorganic acid conventionally used in the art for acid activation treatment of bentonite, in particular sulfuric acid. Generally, the amount of sulfuric acid is usually 1 to 5% by mass, preferably 3 to 5% by mass, of bentonite. The concentration of the sulfuric acid solution may be in the range of, for example, 5-50%. In some embodiments, the concentration of the sulfuric acid solution is 5-20%. After the addition of the acid, the resulting mixture is stirred for a period of time, such as 30 minutes to 2 hours, preferably 45 minutes to 90 minutes.
In a preferred embodiment, the present invention further comprises the step of pre-treating the bentonite to remove impurities. The impurities mainly comprise sand and soluble impurities. The pretreatment comprises soaking bentonite in water, stirring, filtering to remove impurities such as sand, dissolving soluble impurities in water, and removing. Generally, a proper amount of water may be used for soaking according to the quality of bentonite, such as 3-10 times the quality of bentonite. The soaking time is preferably sufficient to remove impurities, and for example, the soaking time may be 10 minutes to 90 minutes, preferably 30 minutes to 70 minutes. After soaking, filtration and impurity removal, the acid-activated pre-treatment may be performed at high temperature as described herein, or the acid-activated pre-treatment may be performed after low-temperature drying. Generally, the low temperature drying may be performed at a temperature below 400 ℃, such as below 300 ℃ (preferably 100-200 ℃). The acid activation treatment described herein may be performed after drying.
In some embodiments, the methods of the present invention comprise the steps of removing impurities, low temperature drying, pulverizing, acid activating treatment, high temperature treatment, cooling, water washing, and drying described herein in that order. In other embodiments, the methods of the present invention comprise the steps of removing impurities, high temperature treatment, pulverizing, acid activation treatment, water washing or low temperature drying followed by water washing, drying described herein in sequence. In other embodiments, the methods of the present invention comprise the steps of removing impurities, high temperature treatment, pulverizing, acid activation treatment, high temperature treatment, direct water washing or cooling followed by water washing and drying described herein in that order.
The activated clay prepared by the method has higher decoloring capacity. Moreover, the method for preparing the activated clay does not need to use a large amount of acid, and can greatly reduce the water consumption.
Thus, in some embodiments, the invention provides the use of a preparation process as described in any of the embodiments herein to enhance the bleaching power of activated clay.
In some embodiments, the invention provides activated clay prepared by any of the methods of the invention described above. Preferably, the moisture content of the activated clay is less than or equal to 10%, such as 7-10%. Preferably, the pH of the activated clay is 2.2-3.
The invention provides a decoloring medium which contains activated clay prepared by the method of any embodiment of the invention.
The invention also provides application of the activated clay prepared by the method according to any embodiment of the invention as a decoloring medium in oil refining, in particular to application in decoloring.
The invention also provides a method for decoloring grease, which comprises the steps of preparing the activated clay by using the method of any one of the invention and decoloring the grease by using the clay. In addition to using the activated clay shown herein, other process parameters for bleaching may be performed according to techniques well known in the art.
The invention also provides a method for refining grease, which comprises the steps of preparing the activated clay by using the method of any one of the invention and decoloring grease by using the clay; preferably, the process further comprises one or more of degumming, deacidification, decolorization, deodorization and dewaxing.
The degumming, deacidification, deodorization and dewaxing described herein may be carried out using any known technique.
The invention also provides a method for preparing blend oil, which comprises A) a step of refining grease by using the method of claim 9 and a step of preparing blend oil by using the grease obtained in the step A).
Examples
The invention will be illustrated by way of specific examples. It should be understood that these examples are illustrative only and are not intended to limit the scope of the invention.
In each example and comparative example, bentonite # 1 was supplied by Fuller's earth technology Co., ltd. In Yile, jiangxi, and bentonite # 2 was supplied by Tianyu bentonite technology Co., ltd. In Ningcity, inner Mongolia.
The method for detecting the decoloring rate of the activated clay comprises the following steps: 100 g of the neutralized soybean oil is weighed, 1 g of activated clay is added, the temperature is raised to 105 ℃ under stirring, the decoloring reaction is carried out for 30min, the decoloring reaction is completed, a buchner funnel is used for carrying out suction filtration on the decolored oil, the color of the filtrate is measured by a rovider colorimeter (a quartz colorimeter groove with the optical path of 133.35mm is used), meanwhile, the color of the neutralized soybean oil raw material is measured, and the decoloring rate of the activated clay is calculated according to the following formula:
Wherein: r and Y are respectively the red value and Huang Zhi of the oil product measured by a Rovinone colorimeter;
(10R+Y) front part Refers to the color value of the oil product (neutralized soybean oil) before decolorization;
(10R+Y) rear part (S) Refers to the color value of the oil after decolorization.
The various materials and methods not specifically identified in the examples are all conventional and may be practiced using, for example, commercially available materials.
Test example 1
The specific surface area and pore size of bentonite after drying for 2 hours at different drying temperatures were tested by using a V-Sorb 2800P specific surface area and pore size analyzer by using a multipoint BET method. The results are shown in Table 1.
Table 1: specific surface area and pore size of bentonite at different drying temperatures
| Drying temperature (. Degree. C.) | Specific surface area (m) 2 /g) | Pore diameter |
| 100 | 216.16269 | 6.582994 |
| 200 | 211.332967 | 7.076156 |
| 300 | 207.579881 | 6.917899 |
| 400 | 209.125443 | 6.722905 |
| 500 | 203.048707 | 7.369089 |
| 600 | 193.729328 | 7.28842 |
| 700 | 41.204396 | 8.027753 |
| 800 | 44.335311 | 8.424266 |
The results show that when the drying temperature is below 600 ℃, the specific surface area and pore size of bentonite are not substantially changed greatly, and therefore the temperature used in the present invention does not exceed 600 ℃.
Example A1 (high temperature drying both before and after acidification)
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering by a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water by a Buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake thin, placing in a muffle furnace at 400 ℃ for 5min to obtain 153 g of bentonite, crushing the bentonite after cooling and enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask with stirring, adding 20.0 g of 10% sulfuric acid solution, continuously stirring for 1h, and placing the materials in the muffle furnace at 400 ℃ for 5min after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.2%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 149 g of activated clay product, wherein the pH value of the clay product is 2.8. The decolorization ratio of the activated clay was 70.9% as measured by using the neutralized soybean oil.
Example A2 (high temperature drying both before and after acidification)
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering by a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water by a Buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake thin, placing in a 600 ℃ muffle furnace for drying for 5h to obtain 155 g of bentonite, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask, adding 100.0 g of 10% sulfuric acid solution with stirring, continuing stirring for 1h, and drying the material at 600 ℃ for 300min after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.2%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 147 g of activated clay product, wherein the pH value of the clay product is 2.3. The decolorization ratio of the activated clay was 71.7% as measured by using the neutralized soybean oil.
Example A3 (high temperature drying both before and after acidification)
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake, drying for 120min in a muffle furnace at 450 ℃ to obtain 154 g of bentonite, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask with stirring, adding 80.0 g of 10% sulfuric acid solution, continuously stirring for 1h, and drying the material at 450 ℃ for 30min after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.7%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 146 g of activated clay product, wherein the pH value of the clay product is 2.5. The decolorization ratio of the activated clay was 74.3% as measured by using the neutralized soybean oil.
Example A4 (high temperature drying both before and after acidification)
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering by a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water by a Buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake thin, placing in a muffle furnace at 550 ℃ for drying for 60min to obtain 155 g of bentonite, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask with stirring, adding 60.0 g of 10% sulfuric acid solution, continuing stirring for 1h, and placing the materials in the muffle furnace at 550 ℃ for drying for 60min after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.9%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 148 g of activated clay product, wherein the pH value of the clay product is 2.4. The decolorization ratio of the activated clay was 73.8% as measured by using the neutralized soybean oil.
Example A5 (direct water washing after acidification, no high temperature drying step)
Taking 1#200 g of bentonite, adding 2000g of water while stirring, stirring for 1h, filtering by a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water by a Buchner funnel (filter paper is qualitative filter paper at medium speed), spreading a filter cake thin, placing in a muffle furnace at 400 ℃ for 60min to obtain 154 g of bentonite, crushing the bentonite after cooling, enabling all the bentonite to pass through the 200-mesh screen, adding the crushed bentonite into a 500ml flask, adding 100.0 g of 10% sulfuric acid solution while stirring, continuing stirring for 1h, placing the materials into a 2000ml large beaker, adding 1000g of water, stirring for 10min, and filtering by a Buchner funnel (filter paper is qualitative filter paper at medium speed); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.2%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 147 g of activated clay product, wherein the pH value of the clay product is 2.3. The decolorization ratio of the activated clay was 71.2% as measured by using the neutralized soybean oil.
Example A6 (direct water washing after acidification, no high temperature drying step)
Taking 1#200 g of bentonite, adding 2000g of water while stirring, stirring for 1h, filtering by a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water by a Buchner funnel (filter paper is qualitative filter paper at medium speed), spreading a filter cake thin, placing in a muffle furnace at 600 ℃ for 60min to obtain 155 g of bentonite, crushing the bentonite after cooling, enabling all the bentonite to pass through the 200-mesh screen, adding the crushed bentonite into a 500ml flask, adding 100.0 g of 10% sulfuric acid while stirring, continuing stirring for 1h, placing the materials into a 2000ml large beaker, adding 1000g of water, stirring for 10min, and filtering by a Buchner funnel (filter paper is qualitative filter paper at medium speed); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 7.3%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 144 g of activated clay product, wherein the pH value of the clay product is 2.3. The decolorization ratio of the activated clay was 71.5% as measured by using the neutralized soybean oil.
Example A7 (drying temperature before acid activation below 400 ℃ C.)
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering by a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water by a Buchner funnel (filter paper is qualitative filter paper with medium speed), spreading a filter cake thin, placing in a 105 ℃ oven for drying for 60min to obtain 159 g of bentonite, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask with stirring, adding 100.0 g of 10% sulfuric acid solution, continuing stirring for 1h, and placing the materials in a muffle furnace for drying for 30min at 400 ℃. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.2%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 147 g of activated clay product, wherein the pH value of the clay product is 2.3. The decolorization ratio of the activated clay was 71.6% as measured by using the neutralized soybean oil.
Example A8 (drying temperature before acid activation below 400 ℃ C.)
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering by a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water by a Buchner funnel (filter paper is qualitative filter paper with medium speed), spreading a filter cake thin, placing in a 105 ℃ oven for drying for 60min to obtain 158 g of bentonite, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask, adding 100.0 g of 10% sulfuric acid solution with stirring, continuing stirring for 1h, and placing the materials in a muffle furnace for drying for 60min at 600 ℃. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.2%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 146 g of activated clay product, wherein the pH value of the clay product is 2.3. The decolorization ratio of the activated clay was 72.1% as measured by using the neutralized soybean oil.
Comparative example A1
Taking 500 g of bentonite 1# and crushing and sieving with a 100-mesh sieve to obtain bentonite fine powder, and drying the bentonite fine powder in a drying oven at 105 ℃ for 5 hours. 200 g of dried bentonite fine powder is taken and placed in a 1000ml flat-bottomed flask, 500 g of water is added, the mixture is stirred uniformly by an electric stirrer and placed in an oil bath pot, the temperature of the oil bath is set to 105 ℃, 100 g of 98% concentrated sulfuric acid (50% of the weight of bentonite dry basis) is added while stirring, the mixture is activated for 10h, then water is used for washing until the pH value of the washing solution reaches 2.8 (19 kg of water is consumed altogether), the material is placed in a 105 ℃ oven for drying for 5h (the water content is 5.1%), and the material is crushed and passes through a 200-mesh screen to obtain an activated clay product. The decolorization ratio of the clay was 67.2% as measured by using the neutralized soybean oil.
Comparative example A2
And (3) crushing 500 g of bentonite 1# and sieving the crushed bentonite 1# with a 100-mesh sieve to obtain bentonite fine powder, and drying the bentonite fine powder in a baking oven at 350 ℃ for 5 hours. 200 g of dried bentonite fine powder is taken and placed in a 1000ml flat-bottomed flask, 500 g of water is added, the mixture is stirred uniformly by an electric stirrer and placed in an oil bath pot, the temperature of the oil bath is set to 105 ℃, 60 g of 98% concentrated sulfuric acid (30% of the weight of bentonite dry basis) is added while stirring, the mixture is activated for 10h, then water is used for washing until the pH value of the washing solution reaches 3.2 (17 kg of water is consumed altogether), the material is placed in a 105 ℃ oven for drying for 5h (the water content is 5.3%), and the material is crushed and passes through a 200-mesh screen to obtain an activated clay product. The decolorization ratio of the clay was measured by using the neutralized soybean oil and found to be 62.8%.
Comparative example A3
Taking 500 g of bentonite 1# and crushing and sieving with a 100-mesh sieve to obtain bentonite fine powder, and drying the bentonite fine powder in a 200 ℃ oven for 5 hours. 200 g of dried bentonite fine powder is taken and placed in a 1000ml flat-bottomed flask, 500 g of water is added, the mixture is stirred uniformly by an electric stirrer and placed in an oil bath pot, the temperature of the oil bath is set to 105 ℃, 30 g of 98% concentrated sulfuric acid (15% of the weight of bentonite dry basis) is added while stirring, the mixture is activated for 10h, then water is used for washing until the pH value of the washing solution reaches 2.7 (15 kg of water is consumed altogether), the material is placed in a 105 ℃ oven for drying for 5h (the water content is 4.2%), and the material is crushed and passes through a 200-mesh screen to obtain an activated clay product. The decolorization rate of the soybean oil is measured by using the neutralized soybean oil, the specific method is shown in annex 1, and the decolorization rate of the clay is 34.7%.
Comparative example A4 (calcination of bentonite at 300 ℃ C. Before acid activation)
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering by using a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water by using a Buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake thin, placing in a muffle furnace at 300 ℃ for baking for 60min to obtain 152 g of bentonite, crushing the bentonite after cooling, enabling all the bentonite to pass through the 200-mesh screen, adding the crushed bentonite into a 500ml flask with stirring, adding 100.0 g of 10% sulfuric acid solution, continuously stirring for 1h, completing the reaction, adding 1000g of water, stirring for 10min, and filtering by using the Buchner funnel (filter paper is used for medium-speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.9%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 148 g of activated clay product, wherein the pH value of the clay product is 2.3. The decolorization ratio of the activated clay was 31.8% as measured by using the neutralized soybean oil.
Comparative example A5 (Bentonite does not remove impurities, dry activation)
Taking 1#200 g of bentonite, crushing the bentonite, enabling the bentonite to pass through a 200-mesh screen, adding the crushed bentonite into a 500ml flask, adding 20.0 g of 98% sulfuric acid while stirring, uniformly mixing, placing the mixture in a 200 ℃ oven for drying for 2 hours, adding 1000g of water, stirring for 10 minutes, and filtering by using a Buchner funnel (filter paper is qualitative filter paper at medium speed); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 9.2%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 153 g of activated clay product, wherein the pH value of the clay product is 2.2. The decolorization ratio of the activated clay was 36.8% as measured by using the neutralized soybean oil.
Comparative example A6
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of bentonite and water with a buchner funnel (medium-speed qualitative filter paper for filter paper), placing a filter cake in a 150 ℃ oven, baking for 3h to obtain 158 g of bentonite, crushing the bentonite, allowing all the bentonite to pass through the 200-mesh screen, adding the crushed bentonite into a 500ml flask with stirring, adding 100.0 g of 10% sulfuric acid solution, continuously stirring for 1h, and placing the materials in a muffle furnace and drying at 150 ℃ for 3h. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake to be thin, then placing the filter cake in a baking oven at 105 ℃ for baking for 2 hours, reducing the water content to 8.6%, and crushing the filter cake to enable the filter cake to pass through a 200-mesh stainless steel screen, thus obtaining a finished product. 162 g of activated clay product is obtained. The decolorization ratio of the activated clay was measured by using the neutralized soybean oil and found to be 51.2%.
Comparative example A7
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of bentonite and water with a buchner funnel (medium-speed qualitative filter paper for filter paper), placing a filter cake in a 200 ℃ oven, baking for 1h to obtain 155 g of bentonite, crushing the bentonite, allowing all the bentonite to pass through the 200-mesh screen, adding the crushed bentonite into a 500ml flask with stirring, adding 100.0 g of 10% sulfuric acid solution, continuously stirring for 1h, and placing the materials in a muffle furnace and drying at 105 ℃ for 3h. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake to be thin, then placing the filter cake in a baking oven at 105 ℃ for baking for 2 hours, reducing the water content to 8.5%, and crushing the filter cake to enable the filter cake to pass through a 200-mesh stainless steel screen, thus obtaining a finished product. 162 g of activated clay product is obtained. The decolorization ratio of the activated clay was 53.8% as measured by using the neutralized soybean oil.
Comparative example A8
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of bentonite and water with a buchner funnel (medium-speed qualitative filter paper for filter paper), placing a filter cake in a 105 ℃ oven, baking for 2h to obtain 157 g of bentonite, crushing the bentonite, allowing all the bentonite to pass through the 200-mesh screen, adding the crushed bentonite into a 500ml flask with stirring, adding 100.0 g of 10% sulfuric acid solution, continuously stirring for 1h, and placing the materials in a muffle furnace and drying at 350 ℃ for 1h. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake to be thin, then placing the filter cake in a baking oven at 105 ℃ for baking for 2 hours, reducing the water content to 8.9%, and crushing the filter cake to enable the filter cake to pass through a 200-mesh stainless steel screen, thus obtaining a finished product. 162 g of activated clay product is obtained. The decolorization ratio of the activated clay was 58.1% as measured by using the neutralized soybean oil.
Comparative example A9
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of bentonite and water with a buchner funnel (medium-speed qualitative filter paper for filter paper), placing a filter cake in a 650 ℃ oven, baking for 2h to obtain 157 g of bentonite, crushing the bentonite, allowing all the bentonite to pass through the 200-mesh screen, adding the crushed bentonite into a 500ml flask with stirring, adding 100.0 g of 10% sulfuric acid solution, continuously stirring for 1h, and placing the materials in a muffle furnace for drying at 650 ℃ for 3h after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake to be thin, then placing the filter cake in a baking oven at 105 ℃ for baking for 2 hours, reducing the water content to 8.3%, and crushing the filter cake to enable the filter cake to pass through a 200-mesh stainless steel screen, thus obtaining a finished product. 156 g of activated clay product is obtained, and the pH value of the activated clay is 3.4. The decolorization ratio of the activated clay was 28.9% as measured by using the neutralized soybean oil.
Comparative example A10
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of bentonite and water with a buchner funnel (medium-speed qualitative filter paper for filter paper), placing a filter cake in a 200 ℃ oven, baking for 2h to obtain 158 g of bentonite, crushing the bentonite, allowing all the bentonite to pass through the 200-mesh screen, adding the crushed bentonite into a 500ml flask with stirring, adding 100.0 g of 10% sulfuric acid solution, continuously stirring for 1h, and placing the materials in a muffle furnace for drying at 650 ℃ for 2h after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake to be thin, then placing the filter cake in a baking oven at 105 ℃ for baking for 2 hours, reducing the water content to 8.1%, and crushing the filter cake to enable the filter cake to pass through a 200-mesh stainless steel screen, thus obtaining a finished product. 154 g of activated clay product is obtained, and the pH value of the activated clay is 3.5. The decolorization ratio of the activated clay was 33.1% as measured by using the neutralized soybean oil.
Comparative example a11
Taking 1#200 g of bentonite, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of bentonite and water with a buchner funnel (medium-speed qualitative filter paper for filter paper), placing a filter cake in a 650 ℃ oven, baking for 2h to obtain 155 g of bentonite, crushing the bentonite, allowing all the bentonite to pass through the 200-mesh screen, adding the crushed bentonite into a 500ml flask with stirring, adding 100.0 g of 10% sulfuric acid solution, continuously stirring for 1h, finishing the reaction, placing the material in a muffle furnace, and drying at 200 ℃ for 3h. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake to be thin, then placing the filter cake in a baking oven at 105 ℃ for baking for 2 hours, reducing the water content to 7.2%, and crushing the filter cake to enable the filter cake to pass through a 200-mesh stainless steel screen, thus obtaining a finished product. 155 g of activated clay product is obtained, and the pH value of the activated clay is 3.3. The decolorization ratio of the activated clay was 31.8% as measured by using the neutralized soybean oil.
The experimental conditions and results of examples A1-A8 and comparative examples A1-A11 are summarized in Table 2 below.
Table 2: results summary of Bentonite 1# examples and comparative examples
Example B1 (high temperature drying both before and after acidification)
Taking bentonite 2#200 g, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake thin, placing in a 600 ℃ muffle furnace for drying for 3h to obtain bentonite 170 g, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask, adding 100 g of 10% sulfuric acid solution with stirring, continuing stirring for 1h, and placing the materials in the muffle furnace for drying at 600 ℃ for 5h after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 9.1%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 176 g of activated clay product, wherein the pH value of the clay product is 2.3. The decolorization ratio of the activated clay was 82.8% as measured by using the neutralized soybean oil.
Example B2 (high temperature drying both before and after acidification)
Taking bentonite 2#200 g, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is qualitative filter paper with medium speed), spreading a filter cake thin, placing in a muffle furnace at 400 ℃ for 5min to obtain bentonite 172 g, cooling, crushing the bentonite, allowing the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask with stirring, adding 10% sulfuric acid solution 20 g, continuing stirring for 1h, and drying the material at 400 ℃ for 5min after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 7.9%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 175 g of activated clay product, wherein the pH value of the clay product is 2.9. The decolorization ratio of the activated clay was 80.3% as measured by using the neutralized soybean oil.
Example B3 (high temperature drying both before and after acidification)
Taking bentonite 2#200 g, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake thin, placing in a muffle furnace at 500 ℃ for drying for 30min to obtain 171 g of bentonite, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask, adding 60 g of 10% sulfuric acid solution with stirring, continuing stirring for 1h, and placing the materials in the muffle furnace at 500 ℃ for drying for 1h after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.8%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 173 g of activated clay product, wherein the pH value of the clay product is 2.6. The decolorization ratio of the activated clay was 83.8% as measured by using the neutralized soybean oil.
Example B4 (high temperature drying both before and after acidification)
Taking bentonite 2#200 g, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake, drying for 30min in a muffle furnace at 450 ℃ to obtain 173 g of bentonite, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask, adding 80 g of 10% sulfuric acid solution with stirring, continuing stirring for 1h, and drying the material at 450 ℃ for 30min in the muffle furnace after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.3%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 176 g of activated clay product, wherein the pH value of the clay product is 2.5. The decolorization ratio of the activated clay was 84.7% as measured by using the neutralized soybean oil.
Example B5 (drying temperature before acidification below 400 ℃ C.)
Taking bentonite 2#200 g, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake, drying for 3h in a muffle furnace at 200 ℃ to obtain bentonite 168 g, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask, adding 100 g of 10% sulfuric acid solution with stirring, continuing stirring for 1h, and drying the material at 500 ℃ for 4h in the muffle furnace after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.8%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 176 g of activated clay product. The decolorization ratio of the activated clay was 81.1% as measured by using the neutralized soybean oil.
Example B6 (drying temperature after acidification below 400 ℃ C.)
Taking bentonite 2#200 g, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake thin, placing in a muffle furnace at 500 ℃ for drying for 3h to obtain bentonite 171 g, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask with stirring, adding 100 g of 10% sulfuric acid solution, continuing stirring for 1h, and placing the materials in the muffle furnace at 300 ℃ for drying for 4h after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.4%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 176 g of activated clay product. The decolorization ratio of the activated clay was 79.6% as measured by using the neutralized soybean oil.
Example B7 (600 ℃ C. Drying before acidification, 550 ℃ C. Drying after activation, 7 times of water washing)
Taking bentonite 2#200 g, adding 1000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake thin, placing in a muffle furnace at 600 ℃ for drying for 3h to obtain bentonite 168 g, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask, adding 100 g of 10% sulfuric acid solution with stirring, continuing stirring for 0.5h, and placing the materials in the muffle furnace at 550 ℃ for drying for 5h after the reaction is completed. After drying, 1400g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a baking oven at 105 ℃ for baking for 2 hours, reducing the water content to 9.2%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 177 g of activated clay product, wherein the pH value of the clay product is 2.5. The decolorization ratio of the activated clay was 83.8% as measured by using the neutralized soybean oil.
Example B8 (200 ℃ C. Drying before acidification, 600 ℃ C. Drying after activation, 3 times of water washing)
Taking bentonite 2#200 g, adding 1000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake, drying in a muffle furnace at 200 ℃ for 3h to obtain bentonite 172 g, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask, adding 100 g of 10% sulfuric acid solution with stirring, continuing stirring for 2h, and drying the material at 600 ℃ for 5h in the muffle furnace after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.8%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 178 g of activated clay product, wherein the pH value of the clay product is 2.2. The decolorization ratio of the activated clay was 82.5% as measured by using the neutralized soybean oil.
Comparative example B1 (conventional wet method)
Taking 500 g of bentonite 2# and crushing and sieving with a 100-mesh sieve to obtain bentonite fine powder, and drying the bentonite fine powder in a drying oven at 105 ℃ for 5 hours. 200 g of dried bentonite fine powder is taken and placed in a 1000ml flat-bottomed flask, 500 g of water is added, the mixture is stirred uniformly by an electric stirrer and placed in an oil bath pot, the temperature of the oil bath is set to 105 ℃, 80 g of 98% concentrated sulfuric acid (40% of the weight of bentonite dry basis) is added while stirring, the mixture is activated for 10h, then water is used for washing until the pH value of the washing solution reaches 3.1 (16 kg of water is consumed altogether), the material is placed in a 105 ℃ oven for drying for 5h (the water content is 6.3%), and the material is crushed and passes through a 200-mesh screen to obtain an activated clay product. The decolorization ratio of the clay was 76.6% as measured by using the neutralized soybean oil.
Comparative example B2 (conventional wet method)
Taking 500 g of bentonite 2# and crushing and sieving with a 100-mesh sieve to obtain bentonite fine powder, and drying the bentonite fine powder in a drying oven at 105 ℃ for 5 hours. 200 g of dried bentonite fine powder is taken and placed in a 1000ml flat-bottomed flask, 500 g of water is added, the mixture is stirred uniformly by an electric stirrer and placed in an oil bath pot, the temperature of the oil bath is set to 105 ℃, 60 g of 98% concentrated sulfuric acid (30% of the weight of bentonite dry basis) is added while stirring, the mixture is activated for 10h, then water is used for washing until the pH value of the washing solution reaches 3.3 (14 kg of water is consumed altogether), the material is placed in a 105 ℃ oven for drying for 5h (the water content is 6.1%), and the material is crushed and passes through a 200-mesh screen to obtain an activated clay product. The decolorization ratio of the clay was 73.5% as measured by using the neutralized soybean oil.
Comparative example B3
Taking bentonite 2#200 g, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake thin, placing in a muffle furnace at 650 ℃ for drying for 3h to obtain bentonite 166 g, crushing the bentonite after cooling and enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask with stirring, adding 100 g of 10% sulfuric acid solution, continuing stirring for 1.0h, and placing the materials in the muffle furnace at 650 ℃ for drying for 5h after the reaction is completed. After drying, 1400g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.2%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 172 g of activated clay product, wherein the pH value of the clay product is 3.1. The decolorization ratio of the activated clay was 46.8% as measured by using the neutralized soybean oil.
Comparative example B4
Taking bentonite 2#200 g, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake, drying in a muffle furnace at 200 ℃ for 2h to obtain bentonite 168 g, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask, adding 100 g of 10% sulfuric acid solution with stirring, continuing stirring for 1.0h, and drying the material at 650 ℃ for 4h in the muffle furnace after the reaction is completed. After drying, 1400g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.7%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 173 g of activated clay product, wherein the pH value of the clay product is 3.2. The decolorization ratio of the activated clay was measured by using the neutralized soybean oil and found to be 51.5%.
Comparative example B5
Taking bentonite 2#200 g, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake thin, placing in a muffle furnace at 650 ℃ for drying for 2h to obtain bentonite 165 g, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask, adding 100 g of 10% sulfuric acid solution with stirring, continuing stirring for 1.0h, and placing the materials in the muffle furnace at 200 ℃ for drying for 4h after the reaction is completed. After drying, 1400g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.3%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 172 g of activated clay product, wherein the pH value of the clay product is 3.2. The decolorization ratio of the activated clay was 55.6% as measured by using the neutralized soybean oil.
Comparative example B6
Taking bentonite 2#200 g, adding 2000g of water with stirring, stirring for 1h, filtering with a 200-mesh stainless steel screen to remove sand and stone in the bentonite, filtering a mixture of the bentonite and the water with a buchner funnel (filter paper is used for medium-speed qualitative filter paper), spreading a filter cake thin, placing in a muffle furnace at 150 ℃ for drying for 2h to obtain bentonite 168 g, crushing the bentonite after cooling, enabling the bentonite to pass through the 200-mesh screen completely, adding the crushed bentonite into a 500ml flask, adding 100 g of 10% sulfuric acid solution with stirring, continuing stirring for 1.0h, and placing the materials in the muffle furnace at 200 ℃ for drying for 3h after the reaction is completed. After drying, 1000g of water was added and stirred for 10min, and then filtered with a buchner funnel (medium speed qualitative filter paper); and (3) spreading the filter cake, then placing the filter cake in a 105 ℃ oven for drying for 2 hours, reducing the water content to 8.5%, cooling and crushing the material, and enabling the material to pass through a 200-mesh screen to obtain 171 g of activated clay product, wherein the pH value of the clay product is 3.0. The decolorization ratio of the activated clay was 43.2% as measured by using the neutralized soybean oil.
The experimental conditions and results of examples B1 to B8 and comparative examples B1 to B6 are summarized in Table 3 below.
Table 3: results summary of Bentonite 2# examples and comparative examples
As can be seen from examples and comparative examples, the activated clay prepared by the method of the invention has higher decoloring capability. Moreover, the method for preparing the activated clay does not need to use a large amount of acid, and can greatly reduce the water consumption.
While the invention has been described with reference to the preferred embodiments, it is not limited thereto, and various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The preparation method of the activated clay is characterized by comprising the step of carrying out high-temperature treatment on bentonite; wherein the high temperature treatment is performed before the acid activation treatment, or after the acid activation treatment, or both before and after the acid activation treatment; wherein the high temperature treatment temperature is 400-600deg.C, such as 400-500deg.C;
preferably, the high temperature treatment is for a period of time ranging from 5 minutes to 300 minutes, such as from 30 minutes to 300 minutes, from 30 minutes to 180 minutes, or from 60 minutes to 120 minutes;
preferably, the acid activation treatment is an acid activation treatment with sulfuric acid; preferably, the amount of sulfuric acid is 1-5% of the mass of bentonite, preferably 3-5%; preferably, the concentration of the sulfuric acid solution is 5-50%, such as 5-20%;
Preferably, the acid activation treatment is carried out for a period of time ranging from 30 minutes to 2 hours, preferably from 45 minutes to 90 minutes.
2. The method of claim 1, wherein,
the acid activation treatment is only carried out before the high-temperature treatment, and the acid activation treatment is directly carried out with water washing, or the acid activation treatment is carried out with water washing after the acid activation treatment is dried at a temperature lower than 400 ℃ such as below 350 ℃ or at a temperature of 100-200 ℃; or (b)
Drying bentonite samples at a temperature lower than 400 ℃, such as 300 ℃ or lower, 200 ℃ or lower, 150 ℃ or lower, or 120 ℃ or lower before the acid activation treatment, optionally crushing, then performing the acid activation treatment, then performing the high-temperature treatment, and directly performing water washing or cooling after the high-temperature treatment is finished; or (b)
Performing high-temperature treatment before the acid activation treatment, and performing high-temperature treatment after the acid activation treatment; wherein the high temperature treated material is optionally crushed after the high temperature treatment prior to the acid activation treatment; after the high-temperature treatment performed after the acid activation treatment is finished, directly performing water washing or cooling and then performing water washing;
preferably, the solid material is dried after washing with water to a dry moisture content of 10% or less.
3. The method according to claim 2, wherein in the washing step, the water is added in an amount of 5 to 10 times the mass of bentonite; preferably, the water wash time is within 5 minutes to 1 hour.
4. A method according to any one of claims 1 to 3, further comprising the step of pre-treating the bentonite to remove impurities.
5. The method of any one of claim 1 to 4,
the method sequentially comprises the steps of impurity removal, low-temperature drying, crushing, acid activation treatment, high-temperature treatment, cooling, water washing and drying; or (b)
The method sequentially comprises the steps of impurity removal, high-temperature treatment, crushing, acid activation treatment, water washing or low-temperature drying, and then water washing and drying; or (b)
The method sequentially comprises the steps of impurity removal, high-temperature treatment, crushing, acid activation treatment, high-temperature treatment, direct water washing or water washing after cooling and drying.
6. Activated clay prepared by the method of any one of claims 1 to 5 or a decolorizing medium comprising the activated clay; preferably, the moisture content of the activated clay is 10% or less, such as 7 to 10%, and/or the pH of the activated clay is 2.2 to 3.
7. Use of an activated clay or decolorizing medium according to claim 8 in the refining of fats and oils, in particular in the decolorization.
8. A method for decolorizing grease, characterized in that the method comprises a step of preparing activated clay using the method of any one of claims 1 to 5, and a step of decolorizing grease using the clay.
9. A method for refining fats & oils, characterized in that it comprises a step of preparing the activated clay by the method according to any one of claims 1 to 5, and a step of decolorizing fats & oils by using the clay; preferably, the process further comprises one or more of degumming, deacidification, decolorization, deodorization and dewaxing.
10. A process for producing a blend oil, characterized in that it comprises a) a step of refining a fat using the process according to claim 9, and a step of producing a blend oil using the fat obtained in step a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111627676.XA CN116351386A (en) | 2021-12-28 | 2021-12-28 | Preparation method of activated clay with improved decoloring capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111627676.XA CN116351386A (en) | 2021-12-28 | 2021-12-28 | Preparation method of activated clay with improved decoloring capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116351386A true CN116351386A (en) | 2023-06-30 |
Family
ID=86925447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111627676.XA Pending CN116351386A (en) | 2021-12-28 | 2021-12-28 | Preparation method of activated clay with improved decoloring capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116351386A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB914454A (en) * | 1960-12-02 | 1963-01-02 | Morton Salt Co | Acid-treated clay process |
| CN101327422A (en) * | 2008-07-23 | 2008-12-24 | 淮阴工学院 | Method for preparing rapid filtration concave earth adsorbing agent for decolouration of tallow oil |
| CN101502787A (en) * | 2009-02-09 | 2009-08-12 | 朱永林 | Method for preparing high-intensity water-resistant multifunctional high-efficient granule active clay preparation and use thereof |
| CN108249452A (en) * | 2018-02-08 | 2018-07-06 | 西南科技大学 | A kind of method that low-temperature bake dry activation prepares atlapulgite |
| CN109954478A (en) * | 2017-12-26 | 2019-07-02 | 金昌红泉膨润土有限责任公司 | A kind of preparation method of atlapulgite acid lowering agent |
-
2021
- 2021-12-28 CN CN202111627676.XA patent/CN116351386A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB914454A (en) * | 1960-12-02 | 1963-01-02 | Morton Salt Co | Acid-treated clay process |
| CN101327422A (en) * | 2008-07-23 | 2008-12-24 | 淮阴工学院 | Method for preparing rapid filtration concave earth adsorbing agent for decolouration of tallow oil |
| CN101502787A (en) * | 2009-02-09 | 2009-08-12 | 朱永林 | Method for preparing high-intensity water-resistant multifunctional high-efficient granule active clay preparation and use thereof |
| CN109954478A (en) * | 2017-12-26 | 2019-07-02 | 金昌红泉膨润土有限责任公司 | A kind of preparation method of atlapulgite acid lowering agent |
| CN108249452A (en) * | 2018-02-08 | 2018-07-06 | 西南科技大学 | A kind of method that low-temperature bake dry activation prepares atlapulgite |
Non-Patent Citations (2)
| Title |
|---|
| 刘健等: "辽西膨润土提纯及活性白土制备研究", 《硅酸盐通报》, vol. 31, no. 1, 29 February 2012 (2012-02-29), pages 2 * |
| 林蔚等: "膨润土改性与印染废水脱色研究", 《齐齐哈尔大学学报》, vol. 26, no. 3, 31 May 2010 (2010-05-31), pages 2 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106010779B (en) | Production method of camellia seed oil with high natural sterol content in plants | |
| CN103055811B (en) | Method for preparing palm oil decolorizing agent by attapulgite clay soybean oil decolorized waste residues | |
| CN107216945B (en) | Preparation method of medicinal injection tea oil | |
| CN105316102A (en) | Preparation method of camellia oil | |
| CN101297708B (en) | Method for preparing high-purity edible fish oil from coarse fish oil | |
| CN106929160A (en) | The method of refined plant oil wax | |
| CN105504086B (en) | A kind of preparation method of food-grade calcium alginate | |
| CN104312721A (en) | Refining method of rice oil | |
| CN103266011B (en) | A kind of working method of linseed oil | |
| CN103055802B (en) | Method for preparing attapulgite clay palm oil decolorizing agent with oxidation resistance | |
| CN105316103A (en) | Preparation method for cannabis oil | |
| US20220298354A1 (en) | Method for preparing high-stability liquid blueberry anthocyanins | |
| CN116351386A (en) | Preparation method of activated clay with improved decoloring capacity | |
| CN115109649B (en) | Euphausia superba oil refining process | |
| CN107022412A (en) | A kind of discoloration method of medical material level camellia seed oil | |
| CN114682238A (en) | Regeneration method of waste clay | |
| CN115770550A (en) | Modified activated carbon and clay mixed decolorant and application thereof in refining crude oil of lubricating oil | |
| CN108219027A (en) | A kind of method that sisal hemp pectin is prepared using sisal hemp waste residue | |
| CN110078072A (en) | A kind of active carbon and preparation method thereof for vegetable oil efficient decolorizing | |
| CN1310186A (en) | pectin producing method | |
| CN115678666A (en) | Peanut oil preparation method and peanut material | |
| CN103666759A (en) | Colza oil decoloring technology | |
| CN113789220A (en) | Oil tea oil refining method | |
| CN106554264A (en) | A kind of parahydroxyacet-ophenone product and preparation method thereof and purposes | |
| CN108795561A (en) | A kind of preparation method of the Radish seed oil rich in raphanin |
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 |