CN114804375B - Biological slime dispersion inhibitor and preparation method and application thereof - Google Patents
Biological slime dispersion inhibitor and preparation method and application thereof Download PDFInfo
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- CN114804375B CN114804375B CN202110124523.7A CN202110124523A CN114804375B CN 114804375 B CN114804375 B CN 114804375B CN 202110124523 A CN202110124523 A CN 202110124523A CN 114804375 B CN114804375 B CN 114804375B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
- C08G65/2618—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing nitrogen
- C08G65/2621—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing nitrogen containing amine groups
- C08G65/2624—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing nitrogen containing amine groups containing aliphatic amine groups
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- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/825—Mixtures of compounds all of which are non-ionic
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- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/83—Mixtures of non-ionic with anionic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
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- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/04—Carboxylic acids or salts thereof
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- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
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- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/28—Sulfonation products derived from fatty acids or their derivatives, e.g. esters, amides
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- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
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- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/72—Ethers of polyoxyalkylene glycols
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- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/74—Carboxylates or sulfonates esters of polyoxyalkylene glycols
Abstract
The invention relates to a biological slime dispersion inhibitor suitable for circulating water cooling water and a preparation method and application thereof. The biological slime dispersion inhibitor is composed of an amide compound, an unsaturated carboxylic acid and polyethylene glycol copolymer, amino polyether and water, and the mass ratio of each component is 2-30. The biological slime dispersion inhibitor provided by the invention can effectively strip and disperse biological slime, and continuously inhibit breeding of the biological slime.
Description
Technical Field
The invention relates to a biological slime dispersion inhibitor and a preparation method and application thereof.
Background
When the industrial circulating cooling water normally runs, oxidizing biocides and non-oxidizing biocides are generally alternately added to control microorganisms and biological slime. At present, the non-oxidizing biocide is an impact addition mode, is easy to cause larger water quality fluctuation, needs to be discharged and replaced, and has poor stripping and dispersing effects on biological slime when the concentration is lower. And when material leakage or other abnormal conditions appear in industrial circulating cooling water, very easily lead to biological slime to breed in a large number, conventional oxidizing biocide, non-oxidizing biocide have can not effectively kill the bacterium in the biological slime this moment, also can not effectively get rid of the biological slime on the metal tube wall, need throw a large amount of high efficiency this moment and peel off the cleaner and wash, this can cause circulating water turbidity, COD to rise by a wide margin, and quality of water seriously worsens, needs to carry out the big discharge of big benefit to the circulating cooling water. It can be seen that when the system is in normal operation, the non-oxidizing biocide is added in an impact manner, and the efficient stripping cleaning agent is added in abnormal conditions, the circulating water needs to be drained and replaced, the sewage treatment plant is generally difficult to receive and treat the sewage, and the sewage contains a large amount of biocide, so that the microbial flora of the sewage treatment plant is easily damaged.
CN103535369A discloses a biological slime inhibitor and a preparation method thereof, and is characterized by comprising the following components in percentage by weight: 5-30% of poly (hexamethylene triamine guanidine hydrochloride), 1-10% of isothiazolinone, 1-10% of organic bromine, 5-40% of alcohol solvent and the balance of water. The effective components of the biological slime inhibitor belong to non-oxidizing biocides, have good biocidal property, but do not have good dispersibility on the biological slime bred in a large amount.
CN104628162A discloses a biological slime stripping agent and a method for stripping biological slime in a circulating cooling water system, wherein the biological slime stripping agent comprises an agent A and an agent B, the agent A is metal borohydride and amino polycarboxylate, the agent B is alkylphenol ethoxylate, and the agent A and the agent B are respectively and independently stored. CN104629920A discloses a biological slime stripping agent and a method for stripping biological slime in a circulating cooling water system, the biological slime stripping agent comprises an agent A and an agent B, the agent A is metal borohydride and amino polycarboxylate, the agent B is quaternary phosphonium salt, and the agent A and the agent B are respectively and independently stored. The metal borohydride in the two patents has strong reducibility, is very easy to react with water, humid air and acid to generate hydrogen which is easy to combust and explode, and is not suitable for being used in large amount in industrial circulating cooling water.
Disclosure of Invention
The invention aims to provide a biological slime dispersion inhibitor which can effectively strip and disperse biological slime and continuously inhibit slime breeding and a preparation method thereof.
The invention also provides application of the biological slime dispersion inhibitor in circulating water cooling water.
The biological slime dispersion inhibitor provided by the invention comprises an amide compound, an unsaturated carboxylic acid and polyethylene glycol copolymer, amino polyether and water, wherein the mass ratio of each component is 2-30.
Preferably, the biological slime dispersant comprises an amide compound, an unsaturated carboxylic acid and polyethylene glycol copolymer, amino polyether and water, wherein the mass ratio of each component is 5-20.
According to the present invention, the amide compound may be a condensation product of a fatty acid and ammonia or an amine.
Wherein said fatty acid is selected from the group consisting of C6-C30, preferably C8-C24 fatty acids, such as cinnamic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, oleic acid, trans-oleic acid, cocoic acid, myristoleic acid, palmitoleic acid, ricinoleic acid, erucic acid, abietic acid, and the like.
Wherein the amine is selected from C1-C8, preferably C1-C6 mono-or diamine, methylamine, dimethylamine, ethylamine, propylamine, diethylamine, ethylenediamine, propylenediamine, butylenediamine, pentylenediamine, hexylenediamine, etc.
According to the present invention, the amide compound may also be a condensation product of an aliphatic amine and an organic acid.
Wherein the fatty amine is selected from C6-C30, preferably C8-C24 fatty amines, such as octylamine, decylamine, dodecylamine, tetradecylamine, hexadecylamine, octadecylamine, oleylamine, abietylamine, etc.
Wherein the organic acid is selected from C1-C8, preferably C1-C6 monocarboxylic acid or dicarboxylic acid, which can be saturated acid or unsaturated acid, preferably formic acid, acetic acid, propionic acid, butyric acid, acrylic acid, oxalic acid, malonic acid, succinic acid, maleic anhydride, citric acid, etc.
According to the invention, the unsaturated carboxylic acid and polyethylene glycol copolymer is a copolymer of unsaturated carboxylic acid and allyloxy polyethylene glycol monomer, and the weight average molecular weight is 2000-200000, preferably 6000-100000. The copolymer can be prepared by the preparation method of patent CN110066029A, and also can be prepared by the following method: (1) Reacting allyloxy polyethylene glycol with sulfonic acid or carboxylic acid to obtain allyloxy polyethylene glycol sulfonate and allyloxy polyethylene glycol carboxylate; (2) Unsaturated carboxylic acids such as acrylic acid, maleic anhydride, itaconic acid, and the like, are polymerized with allyloxypolyethylene glycol monomers such as allyloxypolyethylene glycol, allyloxypolyethylene glycol sulfonate, allyloxypolyethylene glycol carboxylate.
Wherein the unsaturated carboxylic acid is selected from C3-C10 unsaturated carboxylic acids, preferably acrylic acid, methacrylic acid, maleic anhydride, itaconic acid, cinnamic acid, and the like.
Wherein the allyloxy polyethylene glycol monomer is selected from allyloxy polyethylene glycol, allyloxy polyethylene glycol sulfonate, allyloxy polyethylene glycol carboxylate and the like.
According to the invention, the amino polyether is a product of addition of organic amine and ethylene oxide, and has a general formula
Wherein R is 1 、R 2 Is H, alkyl, cycloalkyl or aryl, but not simultaneously H, and R 1 、R 2 The total carbon number is 8-40 3 Is H or C 1 ～C 4 The polymerization degree n of the lower alkyl is 2 to 40. Preferably R 1 、R 2 The total carbon number is 12 to 30 3 Is H or C 1 ～C 4 The polymerization degree n of the lower alkyl group of (2) is 4 to 20.
The amine-based polyether can be prepared by the following method: adding organic amine and alkali into a reactor, controlling the vacuum degree to be 0-0.005 MPa, heating to 120-140 ℃, adding ethylene oxide, reacting at 140-160 ℃, when the pressure in the reactor is reduced to be below 0.01MPa, indicating that the reaction is finished, cooling to room temperature, and discharging to obtain the amino polyether.
Wherein, the weight ratio of the organic amine to the ethylene oxide is 1.
The base may be an inorganic base such as sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, and the like.
The biological slime dispersion inhibitor can also contain a surfactant, alcohols, an organic solvent mutually soluble with water and the like.
The preparation method of the biological slime dispersion inhibitor provided by the invention comprises the following steps of uniformly mixing an amide compound, an unsaturated carboxylic acid and polyethylene glycol copolymer, amino polyether and water according to the mass ratio of 2-30.
The biological slime dispersion inhibitor is applied to circulating cooling water, and the dosing concentration is generally 2-100 mg/L, preferably 5-40 mg/L.
The inventor of the application finds that the biological slime is easy to adsorb and deposit on the metal surface, and the main components of the biological slime are protein, polypeptide and other organic matters. In order to solve the problem of the biological slime, the produced biological slime is peeled and dispersed on one hand, and the originally produced micro biological slime is inhibited from continuously breeding and aggregating into a large amount of biological slime on the other hand. The amide compound in the invention has long alkyl chains, the copolymer has water solubility and oil solubility, and the amino polyether has hydrophilicity and lipophilicity, and can infiltrate and permeate into the biological slime, so that the generated biological slime is stripped and dispersed from the metal surface, and in addition, a trace amount of biological slime which is just formed can be coated and dispersed in water, so that the continuous growth of the biological slime is inhibited. The biological slime dispersed in the water can be discharged out of the system along with the circulating sewage or removed by a circulating water side-filtering system.
The biological slime dispersion inhibitor has good surface activity and dispersibility, can strip and disperse a large amount of generated biological slime, and can inhibit the continuous breeding, growth and deposition of initially generated and trace biological slime.
Detailed Description
It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the examples and comparative examples, amide compounds were obtained from Beijing Yinaoka technologies, inc., such as cinnamic acid amide, caprylic acid amide, lauric acid amide, and the like.
Preparation example 1
In the examples and the comparative examples, the amino polyether is self-made, and the preparation method comprises the following steps: adding n-octylamine and sodium hydroxide into a reaction bottle, vacuumizing to 0.002MPa, heating to 130 ℃, adding ethylene oxide, wherein the mass ratio of n-octylamine to ethylene oxide is 1.
Preparation example 2
In the examples and the comparative examples, the amino polyether is self-made, and the preparation method comprises the following steps: adding dodecylamine and sodium hydroxide into a reaction bottle, vacuumizing to 0.002MPa, heating to 130 ℃, adding ethylene oxide, wherein the mass ratio of the dodecylamine to the ethylene oxide is 1:10, the sodium hydroxide accounts for 0.5% of the mass sum of the dodecylamine and the ethylene oxide, reacting at 150 ℃, cooling to room temperature after the pressure is reduced to below 0.01MPa, and discharging to obtain the dodecylamine polyethylene glycol.
Preparation example 3
The procedure of preparation 2 was followed except that dodecylamine was changed to tetradecylamine.
Preparation example 4
The procedure of preparation 2 was followed except that dodecylamine was changed to hexadecylamine.
Preparation example 5
The procedure of preparation 2 was followed except that dodecylamine was changed to oleylamine.
Example 1
Preparation of biological slime dispersion inhibitor: 2g of cinnamamide, 3g of acrylic acid-allyloxypolyethylene glycol, 5g of n-octylamine polyethylene glycol and 90g of distilled water were mixed to prepare 100g of the dispersion inhibitor A1.
Example 2
Preparation of biological slime dispersion inhibitor: 20g of octanoic acid amide, 5g of acrylic acid-allyloxy polyethylene glycol sulfonate, 5g of dodecylamine polyethylene glycol and 70g of distilled water were mixed to prepare 100g of a dispersion inhibitor A2.
Example 3
Preparation of biological slime dispersion inhibitor: 5g of dodecanoic acid amide, 20g of maleic anhydride-allyloxy polyethylene glycol carboxylate, 5g of tetradecylamine polyethylene glycol and 70g of distilled water were mixed to prepare 100g of a dispersion inhibitor A3.
Example 4
Preparation of biological slime dispersion inhibitor: 5g of hexadecanoic acid amide, 5g of itaconic acid-allyloxy polyethylene glycol, 20g of hexadecyl amine polyethylene glycol and 70g of distilled water were mixed to prepare 100g of the dispersion inhibitor A4.
Example 5
Preparation of biological slime dispersion inhibitor: 10g of oleamide, 10g of acrylic acid-allyloxypolyethylene glycol, 10g of oleylamine polyethylene glycol and 70g of distilled water were mixed to prepare 100g of the dispersion inhibitor A5.
Example 6
Preparation of biological slime dispersion inhibitor: 10g of dicaprylate ethylenediamine bisamide, 30g of maleic anhydride-allyloxy polyethylene glycol sulfonate, 20g of oleylamine polyethylene glycol and 40g of distilled water were mixed to prepare 100g of a dispersion inhibitor A6.
Example 7
Preparation of the biological slime dispersion inhibitor: 10g of octylamine amide, 10g of acrylic acid-allyloxy polyethylene glycol, 10g of dodecylamine polyethylene glycol and 70g of distilled water were mixed to prepare 100g of a dispersion inhibitor A7.
Example 8
Preparation of biological slime dispersion inhibitor: 10g of dodecylamine acrylamide, 10g of maleic anhydride-allyloxy polyethylene glycol carboxylate, 10g of hexadecylamine polyethylene glycol and 70g of distilled water are mixed to prepare 100g of a dispersion inhibitor A8.
Comparative example 1
30g tetradecyldimethylbenzylammonium chloride (1427) was mixed with 70g distilled water to give the comparative example 1 solution, i.e., the D1 solution.
Comparative example 2
A blank control solution, D2 solution, was prepared using 100g of distilled water.
Comparative example 3
Control example 8 preparation of biological slime dispersion inhibitor: 10g of maleic anhydride-allyloxypolyethylene glycol carboxylate, 10g of hexadecylamine polyethylene glycol and 80g of distilled water were mixed to prepare 100g of a solution of comparative example 3, i.e., a D3 solution.
Comparative example 4
Control example 8 preparation of biological slime dispersion inhibitor: 10g of dodecylamine acrylamide, 10g of hexadecylamine polyethylene glycol and 80g of distilled water were mixed to prepare 100g of a solution of comparative example 4, i.e., a D4 solution.
Comparative example 5
Control example 8 preparation of biological slime dispersion inhibitor: 10g of dodecylamine acrylamide, 10g of maleic anhydride-allyloxypolyethylene glycol carboxylate and 80g of distilled water were mixed to prepare 100g of a comparative example 5 solution, i.e., a D5 solution.
Test example
The biological slime stripping performance evaluation test method comprises the following steps: taking a plurality of 250mL conical flasks, respectively adding 50mL of biological slime and 50mL of distilled water, ensuring the consistency of the concentration of the added biological slime, shaking uniformly, respectively adding A1-A8 in examples 1-8 and D1-D5 in comparative examples 1-5, and immediately shaking uniformly, wherein the concentrations of the added medicaments are 5mg/L, 20mg/L and 40mg/L, and the comparative example 2 is a blank comparative test. Then the sample is placed on a rotator and rotated for 24 hours at the rotating speed of 150 r/min. Filtering with filter paper, filtering with 0.2 μm microporous membrane, and measuring the concentration of polysaccharide and protein in the filtrate. The higher the concentration of polysaccharide and protein in the filtrate, the better the peeling performance of the agent to the biological slime.
(1) Determination of polysaccharide concentration
The concentration of the polysaccharide was determined by anthrone-sulfuric acid method. Preparation of anthrone reagent: dissolving 2g of anthrone to 80% 2 SO 4 In 80% by weight of 2 SO 4 The volume is fixed to 1L, and the preparation is prepared and used on the same day.
Before the determination of polysaccharide, protein is removed, and the specific method comprises the following steps: taking a certain volume of solution to be detected, adding 0.2 times volume of chloroform, 0.04 times volume of n-butanol and 0.04 times volume of absolute ethanol, oscillating for 3min, standing, taking supernatant, and repeating the operation for 3 times to obtain clear liquid to be detected.
The polysaccharide content is measured by using the clear solution to be measured after protein removal, and the specific method comprises the following steps: adding 1mL of the clear solution to be detected after protein removal into a clean test tube, cooling the test tube in an ice-water bath, adding 4mL of anthrone reagent, shaking up in the ice-water bath, and heating the test tube in a boiling water bath for 10min. Taking out, cooling, measuring absorbance at 620nm with an ultraviolet-visible spectrophotometer, and calculating according to a glucose standard curve to obtain polysaccharide concentration.
(2) Determination of protein concentration
The concentration of the protein was determined by uv-vis spectrophotometry. The specific principle and method are as follows: the benzene ring of tyrosine and tryptophan residues in the protein contains conjugated double bonds, a strong absorption peak exists at 280nm, and the absorbance at the wavelength is in direct proportion to the solution concentration in a certain concentration range, so that the Laneber-beer law is met. When the solution contains nucleic acids such as purine and pyrimidine, the absorbance at 260nm is stronger than that at 280nm, and the protein concentration measurement at 280nm is greatly interfered, but the protein content can be calculated by utilizing the absorbance difference between 280nm and 260 nm. Is calculated by the formula
C＝1.45A 280 –0.74A 260
In the formula: c, the mass concentration of protein, mg/L; a. The 280 Absorbance of the protein solution at 280 nm; a. The 260 Absorbance of the protein solution at 260 nm.
TABLE 1 Peel Performance evaluation test
The results in table 1 show that the concentrations of polysaccharide and protein in the filtrate can reach 9.2mg/L and 181mg/L respectively at the highest levels when the biological slime dispersion inhibitor of the present invention is added, which is significantly higher than that in the blank test (i.e., comparative example 2), indicating that the biological slime inhibitor has better stripping performance. At the same effective concentration, the polysaccharide and protein concentrations of examples 2-8 were higher than those of comparative example 1 by up to 6.2mg/L and 138mg/L, indicating that the stripping performance was superior to 1427.
The evaluation test method of the dispersion performance of the biological slime comprises the following steps: taking a plurality of 250mL conical flasks, respectively adding 50mL of biological slime and 50mL of distilled water, ensuring the quality concentration of the added biological slime to be consistent, shaking uniformly, respectively adding A1-A8 in examples 1-8 and D1-D5 in comparative examples 1-5, and immediately shaking uniformly, wherein the medicament concentration after adding is 5mg/L, 20mg/L and 40mg/L, and the comparative example 2 is a blank comparative test. Standing at room temperature, and then detecting the turbidity of the supernatant respectively 4h after adding the medicine, wherein the test results are shown in a table 2. The larger the haze, the better the dispersibility.
TABLE 2 Dispersion Performance evaluation test
The results in table 2 show that the turbidity of the supernatant can reach 19.7NTU at most when the bio-slime dispersion inhibitor of the present invention is added, which is significantly higher than that of the blank test 5.0NTU (i.e. comparative example 2), indicating that the bio-slime dispersion inhibitor has better dispersion performance. The turbidity of examples 2-8 was higher than the highest 13.8NTU of comparative example 1 at the same effective concentration, indicating better dispersion performance than 1427.
From a comparison of example 8 and comparative examples 3, 4, 5 it can be seen that: the hexadecylamine polyethylene glycol, the maleic anhydride-allyloxy polyethylene glycol carboxylate and the dodecylamine acrylic amide are mixed for use, have a synergistic interaction effect, and are beneficial to stripping and dispersing the biological slime.
The biological slime dispersion inhibitor has good stripping and dispersing performance on biological slime, can strip and disperse the existing biological slime in a system, can disperse and stabilize original particles of the biological slime to be bred, and inhibits the coalescence and mass breeding of the original particles. In actual industrial circulating cooling water, the peeled and dispersed biological slime or original particles of the biological slime to be bred can pass through a sewage discharge system or be filtered by side filtration.
Claims (17)
1. A biological slime dispersion inhibitor comprises an amide compound, an unsaturated carboxylic acid and polyethylene glycol copolymer, amino polyether and water, wherein the mass ratio of the amide compound to the unsaturated carboxylic acid to the polyethylene glycol copolymer is 2-30The compound is a condensation product of fatty acid and ammonia or amine or a condensation product of fatty amine and organic acid, the copolymer of unsaturated carboxylic acid and polyethylene glycol is a copolymer of unsaturated carboxylic acid and allyloxy polyethylene glycol monomer, the weight-average molecular weight is 2000-200000, and the general formula of the amino polyether is
Wherein R is 1 、R 2 Is H, alkyl, cycloalkyl or aryl, but not simultaneously H, and R 1 、R 2 The total carbon number is 8-40 3 Is H or C 1 ～C 4 The polymerization degree n of the lower alkyl is 2 to 40.
2. The dispersion inhibitor according to claim 1, wherein the mass ratio of the amide compound, the unsaturated carboxylic acid-polyethylene glycol copolymer, the alkyl polyether and the water is 5 to 20.
3. The dispersion inhibitor according to claim 1, wherein the fatty acid is selected from the group consisting of C6-C30 fatty acids.
4. The dispersion inhibitor according to claim 1, wherein the fatty acid is selected from the group consisting of C8-C24 fatty acids.
5. The dispersion inhibitor according to claim 1, wherein the amine is selected from the group consisting of C1-C8 monoamines and diamines.
6. The dispersion inhibitor according to claim 1, wherein the fatty amine is selected from the group consisting of C6-C30 fatty amines.
7. The dispersion inhibitor according to claim 1, wherein the fatty amine is selected from the group consisting of C8-C24 fatty amines.
8. The dispersion inhibitor according to claim 1, wherein the organic acid is selected from a C1-C8 monocarboxylic acid or a dicarboxylic acid.
9. The dispersion inhibitor according to claim 1, wherein the weight average molecular weight of the copolymer of an unsaturated carboxylic acid and polyethylene glycol is 6000 to 100000.
10. The dispersion inhibitor according to claim 1, wherein the unsaturated carboxylic acid is selected from C3-C10 unsaturated carboxylic acids.
11. The dispersion inhibitor according to claim 1, wherein the unsaturated carboxylic acid is selected from acrylic acid, methacrylic acid, maleic anhydride, itaconic acid, and cinnamic acid.
12. The dispersion inhibitor according to claim 1, wherein the allyloxypolyethylene glycol monomer is selected from the group consisting of allyloxypolyethylene glycol, allyloxypolyethylene glycol sulfonate, allyloxypolyethylene glycol carboxylate.
13. The dispersion inhibitor according to claim 1, wherein R is 1 、R 2 The total carbon number is 12 to 30 3 Is H or C 1 ～C 4 The polymerization degree n of the lower alkyl group of (2) is 4 to 20.
14. The dispersion inhibitor according to claim 1, wherein the amine-based polyether is prepared by a method comprising: adding organic amine and alkali into a reactor, controlling the vacuum degree to be 0-0.005 MPa, heating to 120-140 ℃, adding ethylene oxide, reacting at 140-160 ℃, and when the pressure in the reactor is reduced to be below 0.01MPa, cooling to room temperature, and discharging to obtain the amino polyether.
15. The dispersion inhibitor according to claim 14, wherein the ratio of the amount of the organic amine to the amount of the ethylene oxide substance is 1.
16. The method for preparing the biological slime dispersion inhibitor according to any one of claims 1 to 15, comprising the following steps of uniformly mixing an amide compound, an unsaturated carboxylic acid and polyethylene glycol copolymer, an amino polyether and water according to the mass ratio of 2-30.
17. Use of the biological slime dispersion inhibitor according to any one of claims 1 to 15 in circulating cooling water at a dosing concentration of 2 to 100mg/L.
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