CN107824156B - Gas-assisted renewable sol/gel type decolorizing agent and preparation method and application thereof - Google Patents

Gas-assisted renewable sol/gel type decolorizing agent and preparation method and application thereof Download PDF

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CN107824156B
CN107824156B CN201711042585.3A CN201711042585A CN107824156B CN 107824156 B CN107824156 B CN 107824156B CN 201711042585 A CN201711042585 A CN 201711042585A CN 107824156 B CN107824156 B CN 107824156B
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gel
sol
gas
decoloring
solid
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CN107824156A (en
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邢炜
刘士涛
吴聪萍
刘建国
邹志刚
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Kunshan Innovation Institute of Nanjing University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
    • B01J20/0259—Compounds of N, P, As, Sb, Bi
    • 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
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/0004—Preparation of sols
    • 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
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/0052—Preparation of gels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28047—Gels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/34—Regenerating or reactivating
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G25/00—Refining of hydrocarbon oils in the absence of hydrogen, with solid sorbents
    • C10G25/12—Recovery of used adsorbent
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/20—Characteristics of the feedstock or the products
    • C10G2300/201—Impurities

Abstract

The invention discloses a gas-assisted renewable sol/gel type decolorizing agent, and a preparation method and application thereof, wherein the renewable sol/gel type decolorizing agent is CN gel, and C is obtained by roasting raw materials containing C, N element3N4Heating and reacting the solid with mixed alkali to obtain CN sol, and introducing CO into the CN sol after dialysis2The gas forms a CN gel decolorant. The prepared CN gel decolorant has high specific surface area and rich micropore structure, and the decoloration rate of the CN gel decolorant applied to biodiesel reaches up to 90 percent. Introducing hot N into the decolorized CN gel2Then the solution is converted into CN sol which is not mutually soluble with pigment and is kept stand for separation, and then gas is introduced into the CN sol to change the CN sol into gel. The decolorizing agent has higher repeated utilization rate, adopts physical adsorption, does not introduce new impurities into the decolorized oil, has less environmental pollution and lower decolorization oil consumption rate; and the preparation and application of the renewable sol/gel decolorant are completed at normal temperature or lower temperature, so that the required energy consumption is lower.

Description

Gas-assisted renewable sol/gel type decolorizing agent and preparation method and application thereof
Technical Field
The invention belongs to the field of decolorants, and particularly relates to a gas-assisted reproducible sol/gel type decolorant, and a preparation method and application thereof.
Background
The decolorants used for biodiesel in the market at present comprise physical decolorants and chemical decolorants. Physical adsorbents such as activated clay, attapulgite, activated carbon, molecular sieves, rice hull ash and sawdust can reach the decolorization standard of biodiesel, but the oil loss is increased due to a high solid-to-liquid ratio, and meanwhile, the decolorization process needs heating treatment, so that the treatment energy consumption is increased, the reutilization rate is reduced, and the decolorized waste residue seriously pollutes soil. With the increasing of national environmental protection and the increasing perfection of environmental protection laws, the materials face a rejected situation. The chemical decolorant is generally used for oxidizing and degrading pigments in the biodiesel by adding an oxidizing agent so as to achieve the aim of decoloring, but the decoloring effect is only applied to part of pigments in the biodiesel. In addition, new impurities are often easily introduced into the chemical decolorant in the using process, the quality of the chemical decolorant is reduced, even the composition is changed, and the decoloration and refining difficulty of the biodiesel is increased. Although the new ultraviolet irradiation biodiesel decoloring technology is researched, the technology cannot be widely applied due to the problems of difficult amplification, long treatment time, ozone generation and the like.
For example, chinese patent 200910092293.X discloses a biodiesel decoloring method, pretreated biodiesel is to be decolored by using a mixture of activated clay and bentonite and hydrogen peroxide, the two decoloring processes need heating treatment at 90-130 ℃ and 80-100 ℃, the energy consumption is high after amplification treatment, and the treatment of decolored residues is also a problem; the problem that new impurities are introduced into by-products easily generated in the process of heating the biodiesel by using the hydrogen peroxide is not solved, the hydrogen peroxide has high cost and is not suitable for large-scale use, partial pigments can be removed only by oxidation, and the pH condition is also limited.
Chinese patent 20150409767.4 discloses a two-step decoloring process for biodiesel, wherein decolorants used in the two steps are mixed solids of activated clay and activated carbon and are divided into two stages of hot decoloring and cold decoloring, the method can remove pigment impurities in different levels while ensuring appropriate energy consumption saving, but the oil consumption rate in the large-scale treatment process is too high to ensure economic benefit, and the problem that waste soil is difficult to treat is also existed.
Chinese patent 201510098682.9 discloses a method for decoloring biodiesel by using an illumination reaction kettle, wherein the problem that an adsorbing material is difficult to treat can be avoided by using illumination to decolor the biodiesel, partial energy consumption is reduced, but the efficiency of illumination decoloring is generally low, the effect can be seen only by long-time treatment, and ozone is generated in the air by ultraviolet light irradiation, so that the biodiesel is oxidized and deteriorated, the quality of the biodiesel is reduced, and the market requirement cannot be met; meanwhile, the problem that the illumination reaction kettle is difficult to be enlarged to an industrial scale is solved by considering the factors.
Disclosure of Invention
Aiming at the problems, the invention provides the self-assembly sol/gel type biodiesel decolorant regenerated by gas assistance and capable of improving the repeated utilization rate of biodiesel decoloration, not introducing new impurities into the decolored oil, having lower environmental pollution and lower oil consumption rate compared with decolorants such as activated clay and attapulgite, and reducing decoloration energy consumption without heating treatment, and the preparation method thereof.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for preparing a gas-assisted reproducible sol/gel-type decolorizing agent comprises the following steps:
s1: calcining raw material containing C, N element to obtain C of graphite-like phase3N4A solid, and adding said C3N4Grinding and sieving the solid;
s2: c is to be3N4Solid powder with NaOH and NH3·H2Mixing the O mixed alkali liquor according to a solid-liquid ratio of 1: 10-1: 100, and heating for more than 10 hours at the temperature of 30-120 ℃ to obtain CN sol;
s3: dialyzing the CN sol by a dialysis device until the pH value of the dialysate is 6.5-7.5;
s4: and continuously introducing gas which does not react with the CN sol into the CN sol until the CN sol becomes solid CN gel.
As a further improvement of the invention, the heating temperature for preparing the CN sol is 60 ℃.
As a further improvement of the invention, the preparation C3N4The roasting temperature of the solid is 550 ℃, and the roasting time is 4 hours.
As a further improvement of the invention, the NaOH and NH3∙H2The concentration of NaOH in the O mixed alkali liquor is 1-10 mol/L，NH3·H2The mass fraction of the O solution is 25-28%.
As a further improvement of the invention, the gas introduced in S4 is CO2Or by addition of energy producing CO2The raw materials of (1).
As a further improvement of the invention, the raw material containing C, N element is one or more of melamine, dicyandiamide and urea.
According to the preparation method of the gas-assisted reproducible sol/gel-type decolorizing agent, the prepared CN gel decolorizing agent has a microporous structure.
The method for applying the prepared CN gel decolorant to oil product decoloration comprises the following steps:
s1: adding the CN gel into an oil product for decoloring at normal temperature, and standing and separating the CN gel and the oil product after decoloring is finished;
s2: continuously introducing hot N into the CN gel adsorbed with the pigment2Until the CN gel is completely converted into CN sol, standing and separating the CN sol and the pigment adsorbed in the original CN gel;
s3: continuously introducing CO into the separated CN sol2The CN sol is converted into CN gel again;
s4: and repeating the steps S1-S3 to complete CN sol/gel conversion, and repeatedly using CN gel for decoloring and regenerating.
As a further improvement of the invention, the solid-to-liquid ratio of the CN gel to the oil product is 1: 10.
As a further improvement of the invention, said N2The temperature of (a) is 30-70 ℃.
The invention has the beneficial effects that:
1. the CN gel decolorizing agent provided by the invention is mainly used for decolorizing by a physical adsorption method, so that impurities cannot be introduced into an oil product in the decolorizing process to influence the quality of the oil product.
Compared with other adsorptive materials, the preparation and application of the CN gel are carried out at lower temperature, and particularly, extra heating is not needed when the CN gel is used for decoloring pigments in the biodiesel, so that energy can be greatly saved, and the operation is convenient.
By introducing CO between CN gel and CN sol2Or N2The transformation of chemical bonds is realized, so that the physical reversible phase state transformation is further realized, and simultaneously, the pigment adsorbed by the CN gel is separated by fully utilizing the immiscible property between the CN sol and the pigment. The process does not need any new chemical reagent treatment, new impurities can not be generated in the decolorizing agent, not only can the environmental pollution be prevented, but also the reutilization rate of the decolorizing agent can be greatly improved, and the reuse frequency of CN gel is at least 10.
4. With NaOH and NH3·H2O mixed alkali solution treated C3N4The solids, the resulting CN gel decolorant, had a larger specific surface area than the other decolorants. When the solid-liquid ratio of the decolorizing agent to the oil product is 1: when 10 hours, the specific surface area is 596m measured by a specific surface area and pore size analyzer2The porosity is 70 percent, the porous material has rich microporous structures, the adsorption capacity is enhanced, and the decoloring effect is obvious.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The specific implementation process of the invention comprises the preparation of CN gel and the cyclic application of CN gel as a decoloring agent to the decoloring of oil products. The chemical elements contained in the raw materials for preparing the CN gel comprise C, H, O, N, wherein the proportion of C element and N element is high, such as melamine and dicyandiamide. The CN gel is mainly used for decoloring the biodiesel in the embodiment of the method of using the CN gel as the decoloring agent.
All examples described below refer to a solid to liquid ratio as the mass of the solid to the volume of the liquid.
The characterization and evaluation means referred to in all the examples described below include the microporous structure of the CN gel and the application of the CN gel to depigmentation of pigments in biodiesel.
The specific surface area and the micropore structure of the CN gel are measured by a BET and pore size analyzer.
The final decolorization effect is measured by calculating the decolorization rate of the biodiesel, wherein the decolorization rate is calculated by α decolorization rate = (before A decolorization-after A decolorization)/before A decolorization x 100%, wherein A is the absorbance of the biodiesel measured by using an ultraviolet spectrophotometer.
The first embodiment is as follows:
the method comprises the following steps: preparation of CN gel
1. 50g of melamine is taken and roasted for 4h at 550 ℃, and 3g of the obtained C is taken3N4The solid was added to 120ml of 3M NaOH and 5ml of 28% NH3·H2And stirring and reacting for 10 hours in the mixed alkali liquor of O at the temperature of 60 ℃.
2. And cooling the reacted CN sol to room temperature, placing the CN sol into a dialysis bag, and continuously dialyzing the CN sol in 1000ml of deionized water, wherein the deionized water needs to be continuously replaced until the pH of the last part of the deionized water is 6.87.
3. Continuously introducing CO into the dialyzed CN sol2Until it becomes a solid gel.
The obtained CN solid gel has specific surface area of 596m2The proportion of the distribution of the microporous structure was 70%.
Step two: application of CN gel
1. Weighing 10g of CN gel, mixing the gel with 100g of illegal cooking oil biodiesel at normal temperature to realize self-adsorption decoloration of the gel, and separating the oil product from the gel after 60 min;
2. injecting hot N into the decolorized gel2And repeating the previous step after the sol and pigment impurities are separated until the gel is completely changed into the sol, so that the repeated utilization of the CN sol/gel can be realized.
The decoloring effect shows that 10g of CN sol/gel system and 100g of illegal cooking oil biodiesel are mixed for 60min to obtain light yellow decolored oil, an ultraviolet spectrophotometer is used for measuring the absorbance of the biodiesel before and after decoloring, and the decoloring rate of the illegal cooking oil biodiesel firstly decolored by using the CN gel is calculated to be 91.0%, and the CN gel is recycled for 10 when the decoloring rate is reduced to 80.2%.
Example two:
the method comprises the following steps: preparation of CN gel
1. 50g of melamine are calcined at 550 ℃ for 4 hours, 3g of the solid obtained are added to 120ml of 3M NaOH and 10ml of 25% NH3·H2Stirring and reacting the mixture in the mixed alkali liquor of O for 12 hours at the temperature of 60 ℃;
2. cooling the reacted CN sol to room temperature, placing the CN sol into a dialysis bag, and continuously dialyzing the CN sol in 1000ml of deionized water, wherein the deionized water needs to be continuously replaced until the pH value of the last part of deionized water is 6.98;
3. continuously introducing CO into the dialyzed CN sol2Until it becomes a solid gel.
The specific surface area of the prepared CN solid gel is 584m2The distribution proportion of the microporous structure is 68 percent
Step two: application of CN gel
1. Weighing 13g of CN gel, mixing the gel with 130g of illegal cooking oil biodiesel at normal temperature to realize self-adsorption decoloration of the gel, and separating the oil product from the gel after 60 min.
2. Injecting hot N2 into the decolored gel until the gel is completely changed into sol, standing to separate the sol and pigment impurities, and repeating the operation of the previous step to realize the recycling of CN sol/gel.
The decoloring effect shows that 13g of CN sol/gel system and 130g of illegal cooking oil biodiesel are mixed for 60min to obtain light yellow decolored oil, an ultraviolet spectrophotometer is used for measuring the absorbance of the biodiesel before and after decoloring, and the decoloring rate of the illegal cooking oil biodiesel firstly decolored by using the CN gel is calculated to be 90.6%, and the CN gel is recycled for 10 when the decoloring rate is reduced to 79.7%.
Example three:
the method comprises the following steps: preparation of CN gel
1. 50g of melamine are calcined at 550 ℃ for 4 hours, 3g of the solid obtained are added to 120ml of 3M NaOH and 15ml of 28% NH3·H2And stirring and reacting for 10 hours in the mixed alkali liquor of O at the temperature of 60 ℃.
2. And cooling the reacted CN sol to room temperature, placing the CN sol into a dialysis bag, and continuously dialyzing the CN sol in 1000ml of deionized water, wherein the deionized water needs to be continuously replaced until the pH value of the last part of the deionized water is 7.23.
3. Continuously introducing CO into the dialyzed CN sol2Until it becomes a solid gel.
The specific surface area of the prepared CN solid gel is 590m2(ii)/g, the distribution ratio of the microporous structure is 69%
Step two: application of CN gel
1. Weighing 9g of CN gel, mixing the gel with 90g of illegal cooking oil biodiesel at normal temperature to realize self-adsorption decoloration of the gel, and separating the oil product from the gel after 60 min.
2. Injecting hot N into the decolorized gel2And repeating the operation of the previous step until the gel is completely converted into the sol, and separating the sol from pigment impurities, thereby realizing the repeated utilization of the CN sol/gel.
The decoloring effect shows that 9g of CN sol/gel system and 90g of illegal cooking oil biodiesel are mixed for 60min to obtain light yellow decolored oil, an ultraviolet spectrophotometer is used for measuring the absorbance of the biodiesel before and after decoloring, and the decoloring rate of the illegal cooking oil biodiesel firstly decolored by using the CN gel is 89.4% through calculation, and the number of times of the CN gel recycling is 10 until the decoloring rate is reduced to 80.6%. .
Example four:
the method comprises the following steps: preparation of CN gel
1. 50g of dicyandiamide was calcined at 550 ℃ for 4 hours, 3g of the resulting solid was added to 120ml of 3M NaOH and 15ml of 28% NH3·H2And stirring and reacting for 10 hours in the mixed alkali liquor of O at the temperature of 60 ℃.
2. And cooling the reacted CN sol to room temperature, placing the CN sol into a dialysis bag, and continuously dialyzing the CN sol in 1000ml of deionized water, wherein the deionized water needs to be continuously replaced until the pH value of the last part of the deionized water is 6.95.
3. Continuously passing through dialyzed CN solInto CO2Until it becomes a solid gel.
The specific surface area of the prepared CN solid gel is 587m2The distribution proportion of the microporous structure is 67 percent
Step two: application of CN gel
1. Weighing 11g of CN gel, mixing the gel with 90g of illegal cooking oil biodiesel at normal temperature to realize self-adsorption decoloration of the gel, and separating the oil product from the gel after 60 min;
2. injecting hot N2 into the decolored gel until the gel is completely changed into sol, separating the sol and pigment impurities, and repeating the operation of the previous step to realize the recycling of CN sol/gel.
The decoloring effect shows that 11g of CN sol/gel system and 90g of illegal cooking oil biodiesel are mixed for 60min to obtain light yellow decolored oil, an ultraviolet spectrophotometer is used for measuring the absorbance of the biodiesel before and after decoloring, and the decoloring rate of the illegal cooking oil biodiesel firstly decolored by using the CN gel is calculated to be 91.3%, and the CN gel is recycled for 10 when the decoloring rate is reduced to 81.8%.
Example five (CN gel cycle decolorizing example): EXAMPLE one CN gel obtained after completion of decolorization, hot N was introduced thereinto2Until the gel is completely converted into sol, separating the sol from pigment impurities, and introducing CO into the sol2The biodiesel is decolorized by converting the biodiesel into gel again. When the process is circulated to the tenth time, the decolorization rate of the biodiesel is reduced to 80.2 percent, the mass of the sol is changed to 8.5g, and only 0.5g is lost in the process.
In the above embodiment, the prepared CN gel is used for decoloring, and the CN gel can be first made into a flat disc shape such as a button shape or a tablet shape, so as to increase the contact area between the CN gel and the biodiesel and improve the decoloring efficiency.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. A method for preparing a gas-assisted reproducible sol/gel-type decolorizing agent comprises the following steps:
s1: calcining raw material containing C, N element to obtain C of graphite-like phase3N4A solid, and adding said C3N4Grinding and sieving the solid;
s2: c is to be3N4Solid powder with NaOH and NH3·H2Mixing the O mixed alkali liquor according to a solid-liquid ratio of 1: 10-1: 100, and heating for more than 10 hours at the temperature of 30-120 ℃ to obtain CN sol; the NaOH and the NH3∙H2The concentration of NaOH in the O mixed alkali liquor is 1-10 mol/L, NH3·H2The mass fraction of the O solution is 25-28%;
s3: dialyzing the CN sol by a dialysis device until the pH value of the dialysate is 6.5-7.5;
s4: and continuously introducing gas which does not react with the CN sol into the CN sol until the CN sol becomes solid CN gel.
2. The process of claim 1, wherein the decolorizing agent is selected from the group consisting of: the heating temperature for preparing the CN sol is 60 ℃.
3. The process of claim 1, wherein the decolorizing agent is selected from the group consisting of: preparation C3N4The roasting temperature of the solid is 550 ℃, and the roasting time is 4 hours.
4. The process of claim 1, wherein the decolorizing agent is selected from the group consisting of: the gas introduced in S4 is CO2Or by addition of energy producing CO2The raw materials of (1).
5. The process of claim 1, wherein the decolorizing agent is selected from the group consisting of: the raw material containing C, N element is one or more of melamine, dicyandiamide and urea.
6. A gas-assisted regenerable sol/gel-type decolorizing agent obtained by the preparation process according to any one of claims 1-5, characterized in that: the prepared CN gel decolorant has a micropore structure.
7. The method for applying the gas-assisted regenerable sol/gel type decolorant to oil product decoloration according to claim 6, comprising the following steps:
s1: adding the CN gel into an oil product for decoloring at normal temperature, and standing and separating the CN gel and the oil product after decoloring is finished;
s2: continuously introducing hot N into the CN gel adsorbed with the pigment2Until the CN gel is completely converted into CN sol, standing and separating the CN sol and the pigment adsorbed in the original CN gel;
s3: continuously introducing CO into the separated CN sol2The CN sol is converted into CN gel again;
s4: and repeating the steps S1-S3 to complete CN sol/gel conversion, and repeatedly using CN gel for decoloring and regenerating.
8. The method for applying the gas-assisted reproducible sol/gel-type decoloring agent to oil product decoloring according to claim 7, wherein the method comprises the following steps: the solid-liquid ratio of the CN gel to the oil product is 1: 10.
9. The method for applying the gas-assisted reproducible sol/gel-type decoloring agent to oil product decoloring according to claim 7, wherein the method comprises the following steps: said N is2The temperature of (a) is 30-70 ℃.
CN201711042585.3A 2017-10-31 2017-10-31 Gas-assisted renewable sol/gel type decolorizing agent and preparation method and application thereof Active CN107824156B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104673492A (en) * 2015-02-06 2015-06-03 中国农业科学院油料作物研究所 Method for preparing vegetable oil through physical adsorption
CN105148973A (en) * 2015-09-17 2015-12-16 上海大学 Preparation method for electron beam irradiation modified graphite-like-phase carbon nitride for visible-light-driven photocatalyst

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104673492A (en) * 2015-02-06 2015-06-03 中国农业科学院油料作物研究所 Method for preparing vegetable oil through physical adsorption
CN105148973A (en) * 2015-09-17 2015-12-16 上海大学 Preparation method for electron beam irradiation modified graphite-like-phase carbon nitride for visible-light-driven photocatalyst

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