CN110921853A - Anticorrosive environment-friendly scale remover capable of rapidly removing scale and preparation method and application thereof - Google Patents
Anticorrosive environment-friendly scale remover capable of rapidly removing scale and preparation method and application thereof Download PDFInfo
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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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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
- A01N37/02—Saturated carboxylic acids or thio analogues thereof; Derivatives thereof
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
- A01N37/10—Aromatic or araliphatic carboxylic acids, or thio analogues thereof; Derivatives thereof
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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
- C02F5/105—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 combined with inorganic substances
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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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
- C02F2303/04—Disinfection
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Abstract
The invention discloses an anticorrosive environment-friendly scale remover for rapid scale removal and a preparation method and application thereof, wherein the scale remover comprises the following raw materials in parts by weight: 3-40 parts of oxalic acid; 2-20 parts of citric acid; 3-25 parts of malic acid; 2-12 parts of tannic acid; 2-15 parts of sodium polyacrylate; 0.05-1 part of a dispersant; 10-40 parts of a preservative; 50-200 parts of deionized water. The preparation method of the scale remover comprises the following steps: s1 pulverizing oxalic acid, citric acid, tannic acid and malic acid, and sieving; s2, mixing the mixture of S1 with deionized water to obtain a solution A; s3, adding sodium polyacrylate into the solution A, heating and cooling to obtain a solution B; s4 adding antiseptic and dispersant into solution B, mixing. The descaling agent can be used for descaling cooling towers of central air conditioners, water treatment pipelines, boilers and the like, and has the advantages of small environmental pollution, high descaling efficiency and certain sterilization rate.
Description
Technical Field
The invention relates to the technical field of chemical descaling, in particular to an anticorrosive environment-friendly descaling agent for quick descaling and a preparation method and application thereof.
Background
The cooling tower of the central air conditioner is exposed in the air in daily use, and a lot of suspended matters, dust and impurities in the air are continuously accumulated in the cooling tower, so that dirt precipitation can occur in the cooling tower, and a large amount of biological algae mud can be bred in a cooling water system to cause blockage. Secondly in winter, the cooling tower need use very seldom, and can accumulate a large amount of moisture in the cooling tower, and moisture in the cooling tower will cause the corruption to the inside of cooling tower, and the time is of a specified duration, will corrode the material and pile up, leads to local corrosion conditions serious, influences heat conductivility. In addition, the circulating water of the cooling tower contains inorganic salt, organic matters, microorganisms and the like, the water temperature can reach more than 35 ℃ in summer, and if the cooling water is not replaced after long-term use, is not cleaned and disinfected for a long time or is not thoroughly disinfected, a plurality of bacteria can grow, wherein the bacteria are typically legionella bacteria, and the bacteria can cause infectious diseases. Legionella proliferates in large quantities in the cooling water of the cooling tower and forms microbial aerosol, and part of the microbial aerosol directly flows into the air around the cooling tower, so that the legionella can be affected within 800 meters around the cooling tower.
At present, the domestic acidic chemical cleaning agents for cooling water systems and industrial cooling circulating water systems mainly adopt hydrochloric acid, sulfuric acid, nitric acid, ammonium bifluoride and the like, wherein the hydrochloric acid is used most. However, these acids can corrode equipment during use and can be used with corrosion inhibitors during use, and when technicians use the acids and the corrosion inhibitors together, the use ratio of the acids and the corrosion inhibitors is not easy to control, or the use method is improper, so that the excessive use of the acids can easily cause equipment corrosion. Therefore, detergents prepared with weak organic acids are favored.
The invention patent with application number 201610709319.0 discloses a non-corrosive scale remover, which comprises, by mass, 35-45 parts of sulfamic acid, 10-18 parts of propionic acid, 6-7 parts of sodium polyacrylate, 2-10 parts of citric acid, 3-8 parts of phosphoric acid, 40-50 parts of polyethylene glycol, 1-3 parts of ammonium chloride, 1-3 parts of ammonium sulfate, 1-5 parts of a rust remover and 91-99 parts of deionized water. The novel water-saving boiler has a certain sterilization effect, does not corrode water-consuming equipment, prevents dirt from being formed, reduces the times of manually cleaning the boiler, reduces energy consumption and saves cost.
However, the above-mentioned descaling agent contains phosphoric acid, which causes phosphorus pollution to some extent, and the descaling efficiency is not mentioned in the document, while the existing descaling agent has longer descaling time, generally 8-15h, and low descaling efficiency.
Disclosure of Invention
Aiming at the defects of too long descaling time and low efficiency in the prior art, the first object of the invention is to provide an anticorrosive environment-friendly descaling agent for rapid descaling, which has the advantages of small environmental pollution, high descaling efficiency and prevention of growth of harmful microorganisms in equipment.
The second purpose of the invention is to provide a preparation method of the anticorrosive environment-friendly scale remover for rapid scale removal, which has the advantages of more sufficient mixing of raw materials, stronger chelation and adsorption of the scale remover, simple and efficient operation.
The third purpose of the invention is to provide the application of the anticorrosive environment-friendly scale remover for rapid scale removal, which has the advantages of wide application and obvious scale removal effect.
In order to achieve the first object, the invention provides the following technical scheme: an anticorrosive environment-friendly scale remover for quickly removing scale comprises the following raw materials in parts by weight:
3-40 parts of oxalic acid;
2-20 parts of citric acid;
3-25 parts of malic acid;
2-12 parts of tannic acid;
2-15 parts of sodium polyacrylate;
0.05-1 part of a dispersant;
10-40 parts of a preservative;
50-200 parts of deionized water.
By adopting the technical scheme, the combination of oxalic acid, citric acid, tannic acid and malic acid is used as the scale remover, has certain acidity, can remove rust scale in the cooling tower of the central air conditioner, simultaneously loosens a precipitation layer falling in equipment, and provides an acidic environment for the scale remover. The sodium polyacrylate is used as a chelating agent, so that metal ions in the rust can be effectively chelated in an acidic environment, and the rust can be efficiently removed, so that the inner surface of equipment is brighter; the copolymer is formed by the combined action of citric acid, oxalic acid, malic acid and sodium polyacrylate, so that the copolymer has good chelation, the derusting and descaling capabilities of the descaling agent are enhanced, and the descaling process is more efficient. Meanwhile, the dispersing agent is matched for use, suspended matters, dust, impurities and the like accumulated in the cooling tower are dispersed into smaller sludge blocks, so that the solid precipitated substances can be conveniently washed out of the equipment in the later period, and the descaling effect is improved. When the large precipitates are dispersed into small precipitate particles, the scale remover can be favorably fully chelated with the precipitated inner rust scale, adsorbed by charged particles and the like, so that the scale removing efficiency is higher. In addition, the preservative provides a sterilization/bacteriostasis environment, an acid environment is formed under the action of oxalic acid, citric acid and malic acid, and the growth of harmful microorganisms such as legionella is further inhibited, so that the bacterium is effectively inhibited.
Further, the scale remover comprises the following raw materials in parts by weight:
10-30 parts of oxalic acid;
5-15 parts of citric acid;
8-16 parts of malic acid;
6-9 parts of tannic acid;
5-11 parts of sodium polyacrylate;
0.2-0.4 part of dispersant;
15-35 parts of a preservative;
100 portions and 150 portions of deionized water.
By adopting the technical scheme, under the optimized condition, the prepared scale remover has better scale removal efficiency and bacteriostatic effect.
Further, the preservative is a mixture of potassium sorbate, benzoic acid and propionic acid, and the mass ratio of the potassium sorbate to the benzoic acid to the propionic acid is 1:0.5 (2.5-4.5).
By adopting the technical scheme, the mixture of potassium sorbate, benzoic acid and propionic acid is preferably used as a preservative, potassium sorbate, hydrogen peroxide and propionic acid are used as an acidic substance, and the final descaling agent has stronger sterilization and bacteriostasis effects on microorganisms under the coordination of the preservative and other formulas in the descaling agent under the condition that the mass ratio of the potassium sorbate, the benzoic acid and the propionic acid is 1:0.5 (2.5-4.5).
Further, the dispersing agent is one or two of sodium dodecyl sulfate and sodium hexametaphosphate.
By adopting the technical scheme, the sodium dodecyl sulfate is used as a dispersing agent, and is an anionic surfactant, so that the sodium dodecyl sulfate is easily attached to the surfaces of dirt particles, the surface tension of the dirt particles is reduced, foams are generated at dirt positions in an acidic environment, the foams drive the dirt particles to float, and the dispersibility of the dirt particles is good. Sodium hexametaphosphate is an electrodeless electrolyte dispersant, and is ionized into anions and cations in an aqueous solution, the anions and dirt particles are subjected to physical and chemical adsorption, so that the dirt particles have the same charge, and the cations are diffused into the surrounding solution to form an electric double layer (if the cations and the dirt particles are subjected to physical and chemical adsorption, the anions are diffused into the surrounding solution to form the electric double layer). The dirt particles are dispersed by the strong electrostatic repulsion of the electric double layer and can be stably dispersed in the solution.
The use of a dispersing agent thus allows dispersion of the solid matter in the liquid, preventing it from settling, facilitating separation of the solid matter that has detached from the inner walls of the apparatus out of the apparatus, while allowing more complete contact between the solid precipitate and the descaling agent, further accelerating the rate and efficiency of descaling.
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of an anticorrosive environment-friendly scale remover for rapid scale removal comprises the following steps:
s1 respectively crushing oxalic acid, citric acid, tannic acid and malic acid, and sieving the crushed materials by a sieve for later use;
s2, mixing the oxalic acid, the citric acid, the tannic acid, the malic acid and the deionized water obtained in the step S1, and stirring for 10-20min to obtain a solution A;
s3, adding sodium polyacrylate into the solution A, heating and stirring for 30-40min, and cooling to room temperature to obtain a solution B;
s4 adding antiseptic and dispersant into the solution B of S3, and stirring to mix evenly.
By adopting the technical scheme, firstly, the oxalic acid, the citric acid, the tannic acid and the malic acid are screened by the screen, so that the raw materials are finer and more fully mixed in the subsequent mixing step; secondly, adding sodium polyacrylate into the solution A and heating the solution A to ensure that the sodium polyacrylate, oxalic acid, citric acid, tannic acid and malic acid are copolymerized, so that the chelating and adsorbing effects are better, the chelating and adsorbing effects of the final detergent on metal ions in the rust scale are stronger, and the descaling effect is better; and finally, the preservative and the dispersing agent are added from the normal temperature, so that the operation is simple and efficient.
Further, in step S1, the screen is 500-700 mesh.
By adopting the technical scheme, the oxalic acid, the citric acid, the tannic acid and the malic acid pass through the screen, so that the mixing and copolymerization effects at the later stage are better, and the descaling effect and the descaling efficiency of the finally prepared descaling agent are higher.
Further, in step S3, the heating temperature is 80 to 90 ℃.
By adopting the technical scheme, at such a temperature, sodium polyacrylate, oxalic acid, citric acid, tannic acid and malic acid are polymerized to a certain extent, so that the chelating adsorption action on metal ions is stronger, the descaling efficiency of the finally prepared descaling agent is higher, and the descaling effect is better.
In order to achieve the third object, the invention provides the following technical solutions: an application of an anticorrosive environment-friendly scale remover for quickly removing scale.
Further, the applications include descaling of central air conditioning cooling towers, water treatment pipelines, and boilers.
By adopting the technical scheme, the scale remover disclosed by the invention is relatively wide in application range and strong in practicability.
In conclusion, the invention has the following beneficial effects:
firstly, the invention adopts the mixture of oxalic acid, citric acid, malic acid and tannic acid as the scale dissolver, adopts sodium polyacrylate as the chelating agent, and is matched with the dispersant and the preservative, so that the prepared scale remover has the effects of high scale removal efficiency and preventing the growth of harmful microorganisms in equipment under the condition of no phosphorus-containing substances.
Secondly, in the invention, the mixture of potassium sorbate, benzoic acid and propionic acid is preferably used as a dispersant, so that the uniform dispersion and suspension of solid particles in the descaling process are further promoted under an acidic condition, secondary precipitation is avoided, and a high-efficiency descaling effect is obtained.
Thirdly, according to the method, the oxalic acid, the citric acid, the tannic acid and the malic acid are firstly screened by a screen, so that the oxalic acid, the citric acid, the tannic acid and the malic acid can be mixed and copolymerized more fully in the subsequent mixing step; secondly, sodium polyacrylate is added into the solution and then heated, so that the sodium polyacrylate, oxalic acid, citric acid, tannic acid and malic acid are copolymerized, and the chelating and adsorbing effects are better, further the chelating and adsorbing effects of the final detergent on metal ions in the rust scale are stronger, and the descaling effect is better; the whole preparation steps are efficient and easy to realize.
Detailed Description
The present invention will be described in further detail with reference to examples.
Examples
Example 1
An anticorrosive environment-friendly scale remover for quickly removing scale comprises the following preparation formula and proportion: oxalic acid Kg, citric acid 2Kg, malic acid 3Kg, tannic acid 2Kg, sodium polyacrylate 2Kg, dispersant 0.05Kg, sodium hexametaphosphate 10Kg, deionized water 50 Kg; wherein the dispersing agent is prepared by mixing potassium sorbate, benzoic acid and propionic acid in a mass ratio of 1:0.5: 2.5.
Wherein, the sources of different raw materials can be respectively as follows: the sodium polyacrylate is purchased from Henan Zhenzi chemical products, Inc., and has a relative molecular weight of 2000-5000 sodium polyacrylate with a low molecular weight, an industrial grade, a model number of 445N and a product number of 20181213; oxalic acid has CAS number of 144-62-7, is technical grade, and is purchased from Jinan Dethicknesss chemical Co., Ltd; the CAS number of the citric acid is 5949-29-1, is industrial grade, and is purchased from Jinan Yuan Feiwei chemical Limited; the CAS number of malic acid is 5139-89-9, is industrial grade, and is purchased from Rihua Biotech limited, Hebei; the CAS number of tannic acid is 1401-55-4, is industrial grade, and is purchased from Zhang Jiajie Jiu Rui Biotech limited; the CAS number of the sodium hexametaphosphate is 10124-56-8, is industrial grade, and is purchased from Shandong Yukang chemical industry Co., Ltd; the CAS number of the potassium sorbate is 24634-61-5, is industrial grade, and is purchased from Zhengzhou dragon biochemical products Co., Ltd; benzoic acid and propionic acid are both technical grade and purchased from Jiangsu Shunfeng chemical company Limited.
A preparation method of an anticorrosive environment-friendly scale remover for rapid scale removal comprises the following steps:
s1 respectively crushing oxalic acid, citric acid, tannic acid and malic acid, and sieving with a 500-mesh sieve for later use;
s2, mixing the oxalic acid, the citric acid, the tannic acid, the malic acid and the deionized water obtained in the step S1, and stirring for 10min to obtain a solution A;
s3, adding sodium polyacrylate into the solution A, heating to 80 ℃, stirring for 30min, and then cooling to room temperature to obtain a solution B;
s4 adding sodium hexametaphosphate, potassium sorbate, benzoic acid and propionic acid into the solution B of S3, and stirring to mix uniformly.
Examples 2 to 14
The formulation ratio of the anticorrosive environment-friendly detergent for rapid descaling of examples 2-14 is different from that of example 1, and specifically, see table 1, a preparation method of the anticorrosive environment-friendly detergent for rapid descaling is the same as that of example 1.
TABLE 1 formulation ratios of detergents for examples 1-14
Example 15
Example 15 differs from example 12 in that: a preparation method of an anticorrosive environment-friendly scale remover for rapid scale removal comprises the following steps:
s1 respectively crushing oxalic acid, citric acid, tannic acid and malic acid, and sieving with a 700-mesh sieve for later use;
s2, mixing the oxalic acid, the citric acid, the tannic acid, the malic acid and the deionized water obtained in the step S1, and stirring for 20min to obtain a solution A;
s3, adding sodium polyacrylate into the solution A, heating to 90 ℃, stirring for 40min, and then cooling to room temperature to obtain a solution B;
s4 adding sodium hexametaphosphate, potassium sorbate, benzoic acid and propionic acid into the solution B of S3, and stirring to mix uniformly.
Otherwise, the same procedure as in example 12 was repeated.
Example 16
Example 16 differs from example 12 in that: a preparation method of an anticorrosive environment-friendly scale remover for rapid scale removal comprises the following steps:
s1 respectively crushing oxalic acid, citric acid, tannic acid and malic acid, and sieving with a 600-mesh sieve for later use;
s2, mixing the oxalic acid, the citric acid, the tannic acid, the malic acid and the deionized water obtained in the step S1, and stirring for 15min to obtain a solution A;
s3, adding sodium polyacrylate into the solution A, heating to 85 ℃, stirring for 35min, and then cooling to room temperature to obtain a solution B;
s4 adding sodium hexametaphosphate, potassium sorbate, benzoic acid and propionic acid into the solution B of S3, and stirring to mix uniformly.
Otherwise, the same procedure as in example 12 was repeated.
Comparative example
The formulation ratio of the anticorrosive environment-friendly detergent for rapid descaling of comparative examples 1-13 is different from that of example 16, and specifically, see table 2, a preparation method of the anticorrosive environment-friendly detergent for rapid descaling is the same as that of example 16.
TABLE 2 formulation ratios of detergents for comparative examples 1-13
Comparative example 14
The invention patent with reference to application number 201610709319.0 discloses a non-corrosive scale remover, which is prepared by the following formula: 40Kg of sulfamic acid, 14Kg of propionic acid, 8Kg of sodium polyacrylate, 6Kg of citric acid, 6Kg of phosphoric acid, 45Kg of polyethylene glycol, 2Kg of ammonium chloride, 2Kg of ammonium sulfate, 3Kg of rust remover and 95Kg of deionized water. The raw materials are all commercially available and industrial grade.
A preparation method of the non-corrosive scale remover comprises the following steps:
(1) sequentially adding solid materials of citric acid, sodium polyacrylate, sulfamic acid, ammonium chloride, ammonium sulfate and a rust remover into a material dissolving kettle, then adding water and stirring to dissolve the solid materials;
(2) adding liquid material propionic acid into a material dissolving kettle, stirring, and adding polyethylene glycol to dissolve;
(3) sequentially pumping 85% phosphoric acid into a material dissolving kettle, and uniformly stirring all the materials;
(4) filtering the uniformly mixed materials by a 200-mesh terylene screen to obtain the product.
Performance test
Scale removal rate test
And placing a metal sheet in the central air-conditioning cooling tower, and taking out the metal plate with deposited dirt such as sludge, rust scale and the like from the central air-conditioning cooling tower after the central air-conditioning cooling tower is normally operated and used for half a month, wherein the dirt forming conditions are similar, and the formed dirt conditions are similar.
The metal plate is cut into 84 pieces of metal sheets with the same size, each three pieces are in a group, the number of the metal sheets is 1-28, the metal sheets with the number of 1-14 are correspondingly soaked in the scale remover of the embodiment 1-14, the metal sheets with the number of 15-28 are correspondingly soaked in the scale remover of the comparative example 1-14, finally, the cleaning time and the cleaning rate are counted, and the specific results are shown in the table 3.
Wherein the cleaning rate is calculated by the following formula: v ═ W0-Wt)/(St)；
In the formula, V-the scale removal rate of the sample, g/(cm)2·h)；
W0-initial weight of sample, g;
Wt-the weight of the scale removed after descaling of the test specimen, g;
area of S-sample, cm2；
t-soaking time of the sample, h.
The area S of the sample was 100cm at the time of cutting2。
The judgment standard of the cleaning time is as follows: and measuring the weight of the removed dirt of the sample after the dirt is removed every 30min, wherein the mass difference of the last 3 times of measurement results is less than 1g, and the last soaking time is the final soaking time.
(II) Legionella killing and detecting test
The legionella detection method specifically refers to international standard ISO 11731: 1998(Water quality-Detection and characterization of Legionlla).
Blank group: soaking a metal sheet which is not subjected to descaling treatment and has dirt in deionized water for 11h, and then collecting and detecting the bacterium number of legionella on the metal sheet, wherein the bacterium number is marked as A0；
Experimental groups: the metal sheets soaked in the descaling agents of examples 1-14 and comparative examples 1-14 for 11h are taken out, and the bacteria number of the legionella in the descaling agents is collected and detected and is marked as At；
The sterilization rate of the legionella is K, and K is (A)0-At)/A0×100％。
The sterilization rate of the detergents of examples 1-14 and comparative examples 1-14 on legionella bacteria was calculated and counted, and the specific results are shown in table 3.
TABLE 3 results of scale removal and sterilization tests for examples 1-14 and comparative examples 1-14
As can be seen from Table 3, the descaling agent of the present invention has a high descaling rate and can achieve rapid descaling; meanwhile, the scale remover has certain killing and inhibiting effects on legionella in the process of removing scale.
By comparisonThe descaling rate and the sterilization rate against legionella bacteria in examples 1 to 7 were found to be superior to those in example 7, and it was confirmed that the mass ratio of potassium sorbate, benzoic acid and propionic acid was 1:0.5: 3.5. When it was confirmed by examples 7 to 9 and comparative examples 1 to 3 that the amount of tannic acid used was 8Kg, the scale removing rate of the scale remover prepared was 0.20 g/(cm)2H), the sterilization rate is 45.67%, the scheme is relatively good, and when the dosage of the tannin is out of the dosage range of 2-12Kg, the descaling efficiency and sterilization rate of the prepared descaling agent are low; it was confirmed by examples 8, 10 to 11, and 5 to 6 that the descaling rate of the prepared descaling agent was 0.20 g/(cm) when the amount of malic acid was 10Kg2H), the sterilization rate is 44.32%, the effect is the same as that of the embodiment 8, but the malic acid is used in a small amount in the embodiment 11, and the scheme of the embodiment 11 is relatively excellent from the viewpoint of cost saving; examples 11-12 the selection of sodium hexametaphosphate as the dispersant is preferred. Examples 12 to 14 are preferred embodiments in which the preservative potassium sorbate, benzoic acid and propionic acid are selected in a mass ratio of 1:0.5:3.5 based on the formulation and preparation in example 12; comparative examples 7-8, however, verify that when the mass ratio of potassium sorbate, benzoic acid and propionic acid in the preservative is other than 1:0.5 (2.5-4.5), the descaling efficiency and sterilization rate of the prepared descaling agent are much lower than those of example 12; meanwhile, comparative examples 9-11 prove that none of the three preservatives in the preservative is available, otherwise, the sterilization rate of the prepared scale remover is reduced more, and the sterilization effect is poor. While the scale remover of comparative example 14 has a relatively good sterilization rate, the scale removing time is too long and the scale removing rate is low.
(III) application of anticorrosive environment-friendly scale remover for quick scale removal
(1) The anticorrosive environment-friendly scale remover capable of rapidly removing scale, prepared in example 16, is used for removing scale of a cooling tower of a central air conditioner, the scale remover is injected into the cooling tower of the central air conditioner, and the purposes of removing scale and inhibiting bacteria can be met when the soaking time of the scale remover in the cooling tower of the central air conditioner is 6 hours.
(2) The anti-corrosion environment-friendly descaling agent for rapid descaling, which is prepared in example 16, is used for descaling a boiler, the descaling agent is injected into the boiler, and the descaling and bacteria inhibition purposes can be met when the descaling agent is soaked in the boiler for 5 hours.
(3) The anti-corrosion environment-friendly descaling agent for rapid descaling, which is prepared in example 16, is used for descaling a water pipe, the descaling agent is injected into the water pipe, and the water pipe is flushed with the descaling agent for 2 hours, so that the purposes of descaling and bacteriostasis can be met.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The anti-corrosion environment-friendly descaling agent for rapid descaling is characterized by comprising the following raw materials in parts by weight:
3-40 parts of oxalic acid;
2-20 parts of citric acid;
3-25 parts of malic acid;
2-12 parts of tannic acid;
2-15 parts of sodium polyacrylate;
0.05-1 part of a dispersant;
10-40 parts of a preservative;
50-200 parts of deionized water.
2. The anti-corrosion environment-friendly type descaling agent for rapid descaling according to claim 1, wherein the descaling agent comprises the following raw materials in parts by weight:
10-30 parts of oxalic acid;
5-15 parts of citric acid;
8-16 parts of malic acid;
6-9 parts of tannic acid;
5-11 parts of sodium polyacrylate;
0.2-0.4 part of dispersant;
15-35 parts of a preservative;
100 portions and 150 portions of deionized water.
3. The corrosion-resistant environment-friendly type descaling agent for quick descaling is characterized in that the preservative is a mixture of potassium sorbate, benzoic acid and propionic acid, and the mass ratio of the potassium sorbate to the benzoic acid to the propionic acid is 1:0.5 (2.5-4.5).
4. The anticorrosive environment-friendly type detergent for rapid descaling according to claim 1, wherein the dispersant is one or two of sodium dodecyl sulfate and sodium hexametaphosphate.
5. The corrosion-resistant environment-friendly scale remover for rapid scale removal as claimed in claim 1, wherein the relative molecular weight of the sodium polyacrylate is 2000-5000.
6. The method for preparing the anticorrosive environment-friendly descaling agent for rapid descaling as claimed in any one of claims 1 to 5, characterized by comprising the following steps:
s1 respectively crushing oxalic acid, citric acid, tannic acid and malic acid, and sieving the crushed materials by a sieve for later use;
s2, mixing the oxalic acid, the citric acid, the tannic acid, the malic acid and the deionized water obtained in the step S1, and stirring for 10-20min to obtain a solution A;
s3, adding sodium polyacrylate into the solution A, heating and stirring for 30-40min, and cooling to room temperature to obtain a solution B;
s4 adding antiseptic and dispersant into the solution B of S3, and stirring to mix evenly.
7. The method as claimed in claim 6, wherein in step S1, the screen is 500-700 mesh.
8. The method for preparing the anticorrosive environment-friendly detergent for rapid descaling according to claim 6, wherein the heating temperature in step S3 is 80-90 ℃.
9. The use of the anticorrosive environment-friendly scale remover for rapid scale removal as claimed in any one of claims 1 to 5.
10. The use of the corrosion-resistant environmental friendly scale remover for rapid scale removal according to claim 9, wherein the use comprises scale removal of central air conditioning cooling tower, water treatment pipeline and boiler.
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