CN113150876A - Pretreated waste grease and treatment method and application thereof - Google Patents
Pretreated waste grease and treatment method and application thereof Download PDFInfo
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- CN113150876A CN113150876A CN202110620373.9A CN202110620373A CN113150876A CN 113150876 A CN113150876 A CN 113150876A CN 202110620373 A CN202110620373 A CN 202110620373A CN 113150876 A CN113150876 A CN 113150876A
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- waste oil
- oil
- activated carbon
- fat
- waste
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- 239000002699 waste material Substances 0.000 title claims abstract description 103
- 239000004519 grease Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 81
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 78
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 38
- 239000000344 soap Substances 0.000 claims description 33
- 238000003756 stirring Methods 0.000 claims description 27
- 239000000243 solution Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims description 18
- 229910021536 Zeolite Inorganic materials 0.000 claims description 17
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 17
- 239000010457 zeolite Substances 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 15
- 239000002244 precipitate Substances 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 12
- 235000013305 food Nutrition 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 239000011259 mixed solution Substances 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 238000007127 saponification reaction Methods 0.000 claims description 8
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- 238000002203 pretreatment Methods 0.000 claims description 5
- 239000008149 soap solution Substances 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 239000003925 fat Substances 0.000 claims description 4
- 239000010775 animal oil Substances 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 241001465754 Metazoa Species 0.000 abstract description 4
- 238000004332 deodorization Methods 0.000 abstract description 2
- 235000019198 oils Nutrition 0.000 description 64
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 18
- 230000000844 anti-bacterial effect Effects 0.000 description 11
- 235000019197 fats Nutrition 0.000 description 9
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000004448 titration Methods 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 241000191967 Staphylococcus aureus Species 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000012258 culturing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 235000021190 leftovers Nutrition 0.000 description 2
- 235000021049 nutrient content Nutrition 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920001817 Agar Polymers 0.000 description 1
- 235000019737 Animal fat Nutrition 0.000 description 1
- 235000019483 Peanut oil Nutrition 0.000 description 1
- 239000008272 agar Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 230000003385 bacteriostatic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- PSLIMVZEAPALCD-UHFFFAOYSA-N ethanol;ethoxyethane Chemical compound CCO.CCOCC PSLIMVZEAPALCD-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 235000004213 low-fat Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000000312 peanut oil Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- -1 silver ions Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- 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
- C11B13/00—Recovery of fats, fatty oils or fatty acids from waste materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q19/00—Preparations for care of the skin
- A61Q19/10—Washing or bathing preparations
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/48—Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D9/00—Compositions of detergents based essentially on soap
- C11D9/02—Compositions of detergents based essentially on soap on alkali or ammonium soaps
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D9/00—Compositions of detergents based essentially on soap
- C11D9/04—Compositions of detergents based essentially on soap containing compounding ingredients other than soaps
- C11D9/06—Inorganic compounds
- C11D9/18—Water-insoluble compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D9/00—Compositions of detergents based essentially on soap
- C11D9/04—Compositions of detergents based essentially on soap containing compounding ingredients other than soaps
- C11D9/22—Organic compounds, e.g. vitamins
- C11D9/26—Organic compounds, e.g. vitamins containing oxygen
-
- 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)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Dermatology (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- General Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Emergency Medicine (AREA)
- Inorganic Chemistry (AREA)
- Lubricants (AREA)
- Fats And Perfumes (AREA)
Abstract
The invention belongs to the technical field of waste grease treatment methods, and provides pretreated waste grease as well as a treatment method and application thereof. The method filters solid impurities in the waste oil and fat, and then carries out decoloration and deodorization treatment on the waste oil and fat through the modified active carbon. The invention reduces the harm of the waste grease to human bodies and animals and the pollution to the environment, and also can recycle the waste grease, thereby reducing the resource waste.
Description
Technical Field
The invention relates to the technical field of waste grease treatment methods, in particular to pretreated waste grease and a treatment method and application thereof.
Background
With the development of economy, the food industry is developed more and more, but people have higher and higher quality of food, and the food is pursued to be healthy and low-fat food, and more waste grease such as animal fat leftovers and the like are generated in the processing process of the food. If the grease is squeezed by bad merchants, the grease is heated at high temperature, the nutrient content of the grease can be destroyed, the grease is repeatedly heated at high temperature for a long time, the nutrient content in the grease can be gradually reduced, the harmful toxic components are gradually increased, people eat the oil doped with the waste grease for a long time and can cause harm to the human body, and the waste grease can react with other impurities if the waste grease is mixed with other garbage in the treatment process, if the waste grease flows into a breeding place through an illegal way, the poultry and livestock can be attacked, and the waste grease can enter the human body through a food chain and can cause harm to people and animals. The grease can form an oil film in soil gaps, and the growth of plants is damaged. In areas with lower air temperature, oil and water can block underground pipe galleries, so that drainage is not smooth, urban sewage transversely overflows, and the image is damaged. Therefore, the invention provides a pretreatment method and application of waste grease, which not only reduces the harm of the waste grease to human bodies and animals and reduces environmental pollution, but also can recycle the waste grease and reduce resource waste.
Disclosure of Invention
The invention provides a pretreated waste grease and a treatment method and application thereof, solves the problems of harm of the waste grease to human bodies and animals and environmental pollution, and can also recycle the waste grease and reduce resource waste.
The invention aims to provide a method for pretreating waste grease, which comprises the following steps:
s1, heating the waste oil to 50-60 ℃, and filtering to remove solid impurities for later use;
s2 preparation of modified activated carbon
Adding activated carbon into strong acid to enable the concentration of the activated carbon to reach 1.6-4g/L, stirring for 2-5h, standing, collecting precipitate, washing with water, and drying to obtain acidified activated carbon;
adding acidified active carbon into ethanol to obtain a solution of 25-50g/L, stirring for 0.5-1h, adding 2-3g ethylenediamine, stirring at room temperature for 6-9h to obtain a mixed solution, collecting precipitate in the mixed solution, washing with water until the pH value is neutral, and drying to obtain modified active carbon;
s3, treating waste oil by modified activated carbon
Heating the waste oil to 50-60 ℃, adding modified activated carbon in several times, stirring and heating until the temperature reaches 100 ℃ and 110 ℃, preserving the heat for 0.5-1h, and then carrying out centrifugal separation to obtain pretreated waste oil; the mass ratio of the waste grease to the modified activated carbon is 1: 0.01-0.03.
Preferably, the waste oil and fat in S1 includes one of inedible oil and fat produced by food processing units, expired oil and fat, and animal oil and fat leftovers produced during food processing.
Preferably, the strong acid in S2 is nitric acid or hydrochloric acid.
Preferably, in the steps S2 and S3, the stirring speed is 300-500 r/min.
Preferably, in the step S2, the drying temperature is 60-80 ℃ and the drying time is 2-4 h.
A second object of the present invention is to provide the use of the pre-treated waste oil and fat prepared by the above method in the preparation of soap.
The third purpose of the invention is to provide the application of the waste grease after pretreatment in preparing soap.
Preferably, the soap consists of the following components in parts by weight: 40-50 parts of pretreated waste grease, 10-20 parts of sodium hydroxide, 5-12 parts of silver nanoparticles, 5-8 parts of zeolite, 10-15 parts of ethanol and 10-15 parts of water.
Preferably, the preparation method of the soap comprises the following steps:
s1, weighing the components according to the formula;
s2, heating the pretreated waste oil to be dissolved, and keeping the dissolved waste oil at 50-60 ℃ for later use;
adding sodium hydroxide into water to obtain a sodium hydroxide solution with the mass fraction of 40-50%, and keeping the temperature of the sodium hydroxide solution at 50-60 ℃ for later use;
s3, adding the dissolved waste grease into the sodium hydroxide solution, uniformly mixing, and performing saponification reaction to generate a thick soap solution; adding ethanol every 10-20min for 1 time in the process of adding the dissolved waste oil until the addition of the dissolved waste oil is finished;
s4, adding the silver nanoparticles and the zeolite into the thick soap liquid, stirring for 0.5-1h until the silver nanoparticles and the zeolite are uniformly mixed, standing for 10-20min, injecting the liquid into a mold, standing for 24-48h, and taking out.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, firstly, activated carbon is subjected to acidification treatment, so that the surface of the activated carbon contains abundant hydroxyl and carboxyl groups, and can be connected with amino groups of ethylenediamine through hydrogen bonds, the surface of the activated carbon grafted by ethylenediamine contains a large specific surface area, so that the adsorption performance of the activated carbon can be improved, and further, the modified activated carbon can improve the decoloration and deodorization effects of the modified activated carbon on waste oil; then, the pretreated waste oil is used for preparing the soap, in the preparation process of the soap, the pretreated waste oil and sodium hydroxide are subjected to saponification, and the solubility of the pretreated waste oil can be improved by adding ethanol in the saponification process; and secondly, adding silver nanoparticles and zeolite into the thick soap liquid after saponification, wherein the silver nanoparticles are an inorganic antibacterial agent and have a certain antibacterial and bacteriostatic effect, and under the coordination of the zeolite, the silver nanoparticles have high specific surface area, high ion exchange capacity and good slow release performance, can be matched with silver ions, so that the slow release effect of the antibacterial performance is realized, and the antibacterial effect of the soap is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The nitric acid used in the following examples was commercially available at a concentration of 68% and the hydrochloric acid was commercially available at a concentration of 37%, the starting materials used in the following examples were all conventional ones unless otherwise specified, and the experimental procedures were all conventional ones unless otherwise specified.
The waste oil and fat are detected according to GB/T5009.37-2003 test, specifically, 5.00g of different samples (respectively untreated waste oil and pretreated waste oil and fat) are respectively weighed and placed in a conical flask, 50ml of neutral ether-ethanol mixed solution is added, the oil is dissolved by shaking, and if necessary, the mixture can be placed in hot water to promote the dissolution. Cooling to room temperature, adding 2-3 drops of phenolphthalein indicator, titrating with a potassium hydroxide standard titration solution (0.050mol/L) until the color turns reddish, and taking the colorfastness within 0.5min as an end point, and calculating the acid value of the sample according to a formula X ═ V multiplied by c multiplied by 56.11)/m, wherein X is the acid value of the sample (calculated by potassium hydroxide) and has the unit of mg/g; v is the volume of the standard titration solution of potassium hydroxide consumed by the sample, and the unit is mL; c is the actual concentration of standard titration of potassium hydroxide, and the unit is mol/L; m is the sample mass, and the unit is g; 56.11 is the number of milligrams of potassium hydroxide equivalent to 1.0ml of potassium hydroxide standard titration solution [ c (koh) ═ 1.000mol/L ].
According to a Master academic paper 'antibacterial soap antibacterial performance test evaluation method' published in 2013 in 6 th of Li Xiaoting, the antibacterial effect of the soap prepared by the invention is evaluated, the specific method is detailed in part 2.2.1.2, and the principle of the antibacterial performance test method is as follows: 0.1g of the sample was added to 100ml of an agar medium solution melted by cooling to 50 ℃ to prepare a sample plate having a concentration of 0.1%. Pre-culturing and drying for 48h, inoculating the test bacteria on a flat plate which is not polluted by the mixed bacteria, and culturing for 48 h. And observing whether the tested bacteria grow on the flat plate or not, and judging whether the sample to be detected is an antibacterial product or not according to the growth.
Example 1
A pretreatment method of waste grease comprises the following steps:
s1, heating waste oil (frying oil used in the food processing process, the oil is dark yellow in color and has an acid value of 35mgKOH/g oil) to 50 ℃, and removing solid impurities through 200-mesh filter cloth for later use;
s2 preparation of modified activated carbon
Adding 0.4g of activated carbon into 250ml of nitric acid, stirring for 2 hours at 300r/min, standing for 24 hours, collecting precipitates, centrifuging the precipitates, drying for 2 hours at 60 ℃ to obtain acidified activated carbon, and repeating the steps for multiple times to obtain the sample amount required by the experiment;
adding 1g of acidified activated carbon into 40ml of ethanol, stirring for 0.5h at 400r/min, adding 2g of ethylenediamine, stirring for 6h at room temperature to obtain a mixed solution, collecting a precipitate in the mixed solution, washing with water until the pH value is neutral, and drying for 4h at 60 ℃ to obtain modified activated carbon;
s3, treating waste oil by modified activated carbon
Heating the waste oil to 50 ℃, adding modified activated carbon for 2 times, stirring, heating to 100 ℃, keeping the temperature for 30min, and then separating to obtain pretreated waste oil; the mass ratio of the waste oil to the modified activated carbon is 1:0.01, and the treated oil is light yellow in color and has an acid value of 1.25mgKOH/g oil.
Example 2
A pretreatment method of waste grease comprises the following steps:
s1, heating the waste oil (overdue peanut oil, the oil is dark yellow in color and has an acid value of 28.6mgKOH/g oil) to 60 ℃, and removing solid impurities through filter cloth of 300 meshes for later use;
s2 preparation of modified activated carbon
Adding 1g of activated carbon into 250ml of nitric acid, stirring for 5 hours at 400r/min, standing for 24 hours, collecting precipitates, centrifuging the precipitates at the rotation speed of 4000rpm for 4 minutes, drying for 2 hours at 80 ℃ to obtain acidified activated carbon, and repeating the step for multiple times to obtain the sample amount required by the experiment;
adding 2g of acidified activated carbon into 40ml of ethanol, stirring for 1h at 400r/min, adding 3g of ethylenediamine, stirring for 9h at room temperature to obtain a mixed solution, collecting precipitates in the mixed solution, washing with water until the pH value is neutral, and drying for 2h at 60 ℃ to obtain modified activated carbon;
s3, treating waste oil by modified activated carbon
Heating the waste oil to 60 ℃, adding modified activated carbon for 4 times, stirring, heating to 110 ℃, preserving heat for 1h, and then separating to obtain pretreated waste oil; the mass ratio of the waste oil to the modified activated carbon is 1:0.03, and the treated oil is light yellow in color and has an acid value of 1.46mgKOH/g oil.
Example 3
A pretreatment method of waste grease comprises the following steps:
s1, heating waste oil (oil extracted from pig fat generated in the food processing process, wherein the oil is yellow brown in color and has an acid value of 43.5 mgKOH/g) to 55 ℃, and removing solid impurities through 300-mesh filter cloth for later use;
s2 preparation of modified activated carbon
Adding 0.7g of activated carbon into 250ml of hydrochloric acid, stirring for 3 hours at 500r/min, standing for 24 hours, collecting precipitates, centrifuging the precipitates, drying for 3 hours at 70 ℃ to obtain acidified activated carbon, and repeating the steps for multiple times to obtain the sample amount required by the experiment;
adding 1.5g of acidified activated carbon into 40ml of ethanol, stirring for 1h at 400r/min, adding 3g of ethylenediamine, stirring for 9h at room temperature to obtain a mixed solution, collecting a precipitate in the mixed solution, washing with water until the pH value is neutral, and drying for 2h at 80 ℃ to obtain modified activated carbon;
s3, treating waste oil by modified activated carbon
Heating the waste oil to 55 ℃, adding modified activated carbon for 3 times, stirring, heating to 105 ℃, keeping the temperature for 45min, and then separating to obtain pretreated waste oil; the mass ratio of the waste oil to the modified activated carbon is 1:0.02, and the treated oil is light yellow in color and has an acid value of 1.38mgKOH/g of oil.
Next, a soap was prepared using the waste oil and fat pretreated in example 2 as a raw material.
Example 4
The soap comprises the following components in parts by weight: 40 parts of pretreated waste grease, 20 parts of sodium hydroxide, 5 parts of silver nanoparticles, 5 parts of zeolite, 15 parts of ethanol and 15 parts of water.
The preparation method of the soap comprises the following steps:
s1, weighing the components according to the formula;
s2, heating the pretreated waste oil to be dissolved, and keeping the dissolved waste oil at 50 ℃ for later use;
adding sodium hydroxide into water to obtain a sodium hydroxide solution with the mass fraction of 40%, and keeping the temperature of the sodium hydroxide solution at 50 ℃ for later use;
s3, adding the dissolved waste grease into the sodium hydroxide solution, uniformly mixing, and performing saponification reaction to generate a thick soap solution; adding ethanol for 1 time in 10min in the process of adding the dissolved waste oil, wherein the adding amount of the ethanol is 3 parts until the adding of the dissolved waste oil is finished;
s4, adding the silver nanoparticles and the zeolite into the thick soap liquid, stirring for 0.5h until the silver nanoparticles and the zeolite are uniformly mixed, standing for 10min, injecting the liquid into a mold, standing for 24h, taking out the soap after forming, and detecting that the antibacterial rate of the soap prepared in the embodiment to staphylococcus aureus is 96%. .
Example 5
The soap comprises the following components in parts by weight: 50 parts of pretreated waste grease, 10 parts of sodium hydroxide, 12 parts of silver nanoparticles, 8 parts of zeolite, 10 parts of ethanol and 10 parts of water.
The preparation method of the soap comprises the following steps:
s1, weighing the components according to the formula;
s2, heating the pretreated waste oil to be dissolved, and keeping the dissolved waste oil at 55 ℃ for later use;
adding sodium hydroxide into water to obtain a sodium hydroxide solution with the mass fraction of 50%, and keeping the temperature of the sodium hydroxide solution at 55 ℃ for later use;
s3, adding the dissolved waste grease into the sodium hydroxide solution, uniformly mixing, and performing saponification reaction to generate a thick soap solution; adding ethanol for 1 time in 20min in the process of adding the dissolved waste oil, wherein the adding amount of the ethanol is 5 parts until the adding of the dissolved waste oil is finished;
s4, adding the silver nanoparticles and the zeolite into the thick soap liquid, stirring for 1 hour until the silver nanoparticles and the zeolite are uniformly mixed, standing for 15 minutes, injecting the liquid into a mold, standing for 36 hours, taking out the soap after forming, and detecting that the antibacterial rate of the soap prepared in the embodiment to staphylococcus aureus is 93%.
Example 6
The soap comprises the following components in parts by weight: 45 parts of pretreated waste grease, 15 parts of sodium hydroxide, 8 parts of silver nanoparticles, 6 parts of zeolite, 12 parts of ethanol and 14 parts of water.
The preparation method of the soap comprises the following steps:
s1, weighing the components according to the formula;
s2, heating the pretreated waste oil to be dissolved, and keeping the dissolved waste oil at 60 ℃ for later use;
adding sodium hydroxide into water to obtain a sodium hydroxide solution with the mass fraction of 50%, and keeping the temperature of the sodium hydroxide solution at 60 ℃ for later use;
s3, adding the dissolved waste grease into the sodium hydroxide solution, uniformly mixing, and performing saponification reaction to generate a thick soap solution; adding ethanol for 1 time in 15min in the process of adding the dissolved waste oil, wherein the adding amount of the ethanol is 4 parts until the adding of the dissolved waste oil is finished;
s4, adding the silver nanoparticles and the zeolite into the thick soap liquid, stirring for 1 hour until the silver nanoparticles and the zeolite are uniformly mixed, standing for 20 minutes, injecting the liquid into a mold, standing for 48 hours, taking out the soap after forming, and detecting that the antibacterial rate of the soap prepared in the embodiment to staphylococcus aureus is 92%.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A pretreatment method of waste grease is characterized by comprising the following steps:
s1, heating the waste oil to 50-60 ℃, and filtering to remove solid impurities for later use;
s2 preparation of modified activated carbon
Adding activated carbon into strong acid to enable the concentration of the activated carbon to reach 1.6-4g/L, stirring for 2-5h, standing, collecting precipitate, washing with water, and drying to obtain acidified activated carbon;
adding acidified active carbon into ethanol to obtain a solution of 25-50g/L, stirring for 0.5-1h, adding 2-3g ethylenediamine, stirring at room temperature for 6-9h to obtain a mixed solution, collecting precipitate in the mixed solution, washing with water until the pH value is neutral, and drying to obtain modified active carbon;
s3, treating waste oil by modified activated carbon
Heating the waste oil to 50-60 ℃, adding modified activated carbon in several times, stirring and heating until the temperature reaches 100 ℃ and 110 ℃, preserving the heat for 0.5-1h, and then carrying out centrifugal separation to obtain pretreated waste oil; the mass ratio of the waste grease to the modified activated carbon is 1: 0.01-0.03.
2. The method as claimed in claim 1, wherein the waste oil and fat in S1 comprises one of inedible oil and fat produced by food processing unit, expired oil and fat, and animal oil and fat leftover produced during food processing.
3. The method for pretreating waste oil and fat according to claim 1, wherein the strong acid in the S2 is nitric acid or hydrochloric acid.
4. The method as claimed in claim 1, wherein the stirring speed in the steps S2 and S3 is 300-500 r/min.
5. The method for pretreating waste oil and fat according to claim 1, wherein in the step S2, the drying temperature is 60-80 ℃ and the drying time is 2-4 h.
6. A pretreated waste oil or fat produced by the method of any one of claims 1 to 5.
7. Use of a pre-treated waste oil according to claim 6 in the preparation of soap.
8. The application of the pretreated waste oil and fat in preparing soap according to claim 7, wherein the soap is composed of the following components in parts by weight: 40-50 parts of pretreated waste grease, 10-20 parts of sodium hydroxide, 5-12 parts of silver nanoparticles, 5-8 parts of zeolite, 10-15 parts of ethanol and 10-15 parts of water.
9. The use of the pretreated waste oil and fat in the preparation of soap according to claim 8, wherein the soap is prepared by a method comprising the steps of:
s1, weighing the components according to the formula;
s2, heating the pretreated waste oil to be dissolved, and keeping the dissolved waste oil at 50-60 ℃ for later use;
adding sodium hydroxide into water to obtain a sodium hydroxide solution with the mass fraction of 40-50%, and keeping the temperature of the sodium hydroxide solution at 50-60 ℃ for later use;
s3, adding the dissolved waste grease into the sodium hydroxide solution, uniformly mixing, and performing saponification reaction to generate a thick soap solution; adding ethanol every 10-20min for 1 time in the process of adding the dissolved waste oil until the addition of the dissolved waste oil is finished;
s4, adding the silver nanoparticles and the zeolite into the thick soap liquid, stirring for 0.5-1h until the silver nanoparticles and the zeolite are uniformly mixed, standing for 10-20min, injecting the liquid into a mold, standing for 24-48h, and taking out.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117801881A (en) * | 2024-02-26 | 2024-04-02 | 北京海新能源科技股份有限公司 | Pretreatment method for waste grease |
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| CN117801881A (en) * | 2024-02-26 | 2024-04-02 | 北京海新能源科技股份有限公司 | Pretreatment method for waste grease |
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