107results about How to "Excellent corrosion and scale inhibition" patented technology

The invention belongs to the technical field of chemical industry, and relates to a cooling water corrosion inhibitor, in particular to an efficient composite corrosion and scale inhibitor which can remarkably reduce corrosion and scaling phenomena of the cooling water of a petrochemical system. The corrosion and scale inhibitor is prepared by evenly mixing organic phosphine carboxylic acid corrosion inhibitor, organic multi-element phosphine acid corrosion and scale inhibitor, polymer scale inhibitor, metal ion succimer, surface active agent, zinc salt, functionality additive and water. The corrosion and scale inhibitor prepared from the components has low phosphine content and excellent corrosion and scale inhibition performance, can prolong the service life of devices, improve the repeated utilization rate of cooling water and reduce the water resource consumption.

A corrosion-inhibiting and scale-inhibiting agent for treating the water used as circulated cooling water or for boiler is prepared from liquid-state dielectric hydrophobic substance, oil-soluble corrosion inhibitor, water-soluble disperser, and composite sensitive emulsifier. Its advantages are high effect and low dosage.

The invention discloses an ash water scale inhibitor as well as preparation and screening test methods thereof. the ash water scale inhibitor is prepared from raw materials in percentage by weight as follows: 2%-10% of HEDP, 10%-15% of 2-phosphonobutane-1,2,4-tricarboxylic acid, 20%-30% of a maleic acid-acrylic copolymer, 10%-20% of hydrolytic polymaleic anhydride, 5%-10% of an acrylic acid-hydroxypropyl acrylate copolymer, 5%-15% of a phosphono-carboxylic acid copolymer, 5%-10% of an acrylic acid-2-acrylamide-2-methyl propane sulfonic acid copolymer and the balance of purified water. The prepared ash water scale inhibitor has calcium resistance, pH resistance and high-temperature resistance, has good corrosion and scale inhabitation performance, has good scale inhibition and prevention effects and is applicable to ash water with water quality characteristics of high temperature, high alkali and high pH, particularly to a power plant ash removal system. The ash water scale inhibitor screened with the ash water scale inhibitor screening test method reaches the expected corrosion and scale inhabitation effects, and the hydraulic ash removal efficiency is improved.

A corrosion-retardant scaling inhibitor for the high-Cl and -Ca water contains proportionally phosphonylic acid, polyphosphonic acid, organic phosphonate, Zn sale, Mn salt, polyacrylic acid, antimildew agent and purified water.

The invention relates to a corrosion and scale inhibitor, which comprises a component A and a component B, wherein the component A comprises an organic phosphine compound, a multipolymer dispersant and deionized water; the component B comprises polyphosphate, inorganic zinc salt and molybdate, wherein the mass ratio of the component A to component B is 2:1-1:2. The corrosion and scale inhibitor also comprises a component C, wherein the component C comprises an azole compound, a hydroxide, an organic solvent and deionized water. Compared with a traditional single liquid corrosion and scale inhibitor, the corrosion and scale inhibitor of the invention has strong composite formula adaptability, ratio and dilution times can be timely adjusted according to client on-site water quality; for the terminal clients, storage space is saved, transport cost is reduced, and usage cost of its agent is reduced simultaneously.

The invention discloses a water treatment medicament with functions of inhibiting corrosion and scale and killing microbes. The water treatment medicament is a polyepoxysuccinic acid / bronopol copolymer, wherein polyepoxysuccinic acid serves as a main body, and then is subjected to polymerization after being grafted with bronopol so as to obtain the polyepoxysuccinic acid / bronopol copolymer, the copolymer does not contain phosphorus, can be biodegradable, has a very good effect of inhibiting the corrosion and the scale, and has certain effect of killing the microbes due to the existence of oxidising bromine atom. The polyepoxysuccinic acid / bronopol copolymer prepared by using the method disclosed by the invention has the scale inhibition rate on calcium carbonate and corrosion inhibition rate on carbon steel similar to those of the polyepoxysuccinic acid, so that the effects of scale inhibition and corrosion inhibition of the water treatment medicament can be ensured.

The invention discloses a corrosion and scale inhibitor for treating circulating cooling water. The corrosion and scale inhibitor is composed of the following raw materials in percentage by mass: 3-15% of polyaspartic acid, 0-8% of organic phosphine, 2-10% of phosphine carboxylic acid, 5-10% of carboxyl group-containing polymer, 1-3% of copper corrosion inhibitor, 0-16% of zinc salt and the balance of water. The corrosion and scale inhibitor disclosed by the invention is low in phosphorus content and biodegradable, and no water body eutrophication is caused by pollution discharge; the corrosion and scale inhibitor has excellent corrosion and scale inhibition properties and can effectively improve the heat exchange effect of a central air conditioning refrigerating unit when being applied in a central air conditioning circulating cooling water system, the average temperature difference of a condenser is not larger than 1.0 DEG C and the average temperature difference of an evaporator is not larger than 2.4 DEG C, and thus safe, stable and economical operation of the unit is ensured.

The invention discloses a quadripolymer-type corrosion-inhibition scale inhibitor PMAHS. The quadripolymer-type corrosion-inhibition scale inhibitor PMAHS comprises maleic anhydride (MA), acrylic acid (AA), hydroxyethyl acrylate (HEA), sodium methallylsulfonate (SMAS), sodium persulfate, sodium hypophosphite, isopropanol and water. The invention also discloses a preparation method of the quadripolymer-type corrosion-inhibition scale inhibitor PMAHS. The quadripolymer-type corrosion-inhibition scale inhibitor PMAHS has excellent effects of inhibiting production of calcium phosphate scales and calcium carbonate scales and especially phosphate scales, has good iron oxide dispersibility, has functions of corrosion inhibition, high temperature resistance and acid and base resistance, and has a stable molecular structure and low phosphorus content. The preparation method does not produce three wastes in production. The quadripolymer-type corrosion-inhibition scale inhibitor PMAHS has the advantages of simple circulating cooling water treatment processes, low use amount, low cost, good effects, good economic benefits and wide social benefits.

A three elements cooperating corrosion inhibitor PASP-Zn-PBTCA used as composite water treating agent for treating the circulated cooling water and sewage is composed of polyaspartate substances, Zn salt and 2-phosphobutane-1,2,4-tricarboxylic acid.

The invention discloses a composite slow-release scale inhibitor suitable for a petrochemical wastewater reusing circulating water system. The composite slow-release scale inhibitor comprises 2-butane phosphate-1,2,4-tricarboxylic acid, hydroxy ethylidene diphosphonic acid, amino trimethylene phosphonic acid and zinc sulfate. After the composite slow-release scale inhibitor is adopted, by virtue of dynamic simulation experiment on oil refinery reuse water, the water quality inhibition rate is 86.18%; by virtue of the dynamic simulation experiment on ethylene plant reuse water, the water quality inhibition rate is 86.44%, and the scale inhibiting rate is 87.42%; the corrosion rate is reduced to 0.0168 mm / a and 0.0091 mm / a, which meets the anticorrosion requirement that the corrosion rate of China petrochemical circulating cooling water is less than 0.075 mm / a. Compared with the traditional polyphosphate carboxylate composite slow-release scale inhibitor, the composite slow-release scale inhibitor disclosed by the invention has the advantages of small addition amount and good corrosion inhibition effect and scale inhibition.

The invention discloses a composite scale and corrosion inhibitor. The inhibitor is characterized by comprising the following main ingredients: 2-phosphono-1,2,4-tricarboxylic acid, hydroxyethylidene-1,1-diphosphonic acid, an acrylic copolymer, benzotriazole, zinc chloride, polyepoxysuccinic acid and deionized water. The inhibitor disclosed by the invention has the following beneficial effects that 2-phosphono-1,2,4-tricarboxylic acid, the hydroxyethylidene-1,1-diphosphonic acid, the acrylic copolymer, benzotriazole, zinc chloride and the polyepoxysuccinic acid of the inhibitor all have good scale and corrosion resistance; and after the above ingredients are compounded according to the weight parts in the formulation of the inhibitor disclosed by the invention, the scale and corrosion resistance effect of the inhibitor is obviously enhanced. The inhibitor disclosed by the invention is suitable for high hardness and high base, and has extremely strong complexing function on carbonate scale. The composite sale and corrosion inhibitor is good in scale and corrosion resistance, low in phosphorus content, and therefore is capable of meeting environment protection requirements. The inhibitor disclosed by the invention not only is suitable for circulating cooling water in a natural gas purification treatment plant, but also is suitable for circuiting cooling water systems in other industries of chemical fertilizer, power, textile and the like, as well as is wide in application range; and acid does not need to be added for regulating PH (Potential of Hydrogen) value.

The present invention discloses one kind of water trating agent with amino sulfuric acid and organic base modified sodium / potassium aspartate as main agent and sodium gluconate and zinc salt as supplementary material. It has simple preparation process, has scale inhibiting and corrosion retarding functions, and is green water treating agent without phosphate and pollution.

The invention discloses a phosphorus-free composite water treatment agent and a preparation method thereof. The formula of the composite water treatment agent contains polyaspartic acid, polyepoxysuccinic acid, molybdate, cerium source, benzotriazole and / or methylbenzotriazole and water. The preparation method includes the following step that: according to the formula, the water, the polyaspartic acid, the polyepoxysuccinic acid, the benzotriazole and / or methylbenzotriazole, the molybdate and the cerium source are sequentially added and uniformly mixed. The composite water treatment agent has good corrosion-and-scale-inhibiting property, is highly environment-friendly, does not have phosphorus or toxin, and can be easily biodegraded, moreover, the dosage concentration is low, and the cost is low.

The invention provides a high-effective composite corrosion and scale inhibitor which includes following components, by mass, 8-18 parts of polyhydric alcohol phosphate ester, 5-15 parts of hydroxyethidene diphosphonic acid, 10-20 parts of phosphor carboxylic acid copolymer, 5-15 parts of zinc sulfate, 0.1-0.5 parts of copper corrosion inhibitor, 10-20 parts of a high-effective dispersing agent, 1-3 parts of a co-solvent and 10-60 water. The corrosion and scale inhibitor is suitable for water quality of high hardness, high alkalinity and strong scaling property and achieves excellent scale and corrosion inhibition performance. The corrosion and scale inhibitor is free of inorganic phosphate so that calcium phosphate scale precipitation is prevented. The corrosion and scale inhibitor is free of toxic substances, such as chromate, so that the corrosion and scale inhibitor is pollution-free and is beneficial to environmental protection. The corrosion and scale inhibitor is low in cost, is easy to compound, is good in stability and is less in use amount. An excellent synergy is achieved among the components, so that the corrosion and scale inhibitor is stable in performance and excellent in performance.

The invention discloses a special solid corrosion and scale inhibitor for oilfield reinjection water and a preparation method thereof, and belongs to a chemical composition for treatment of oilfield water. The invention particularly relates to a composition for corrosion resistance and scale inhibition in oilfield sewage treatment and reinjection processes. The corrosion and scale inhibitor is prepared from the following raw materials: 20%-50% of 40%-60% 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), 20%-50% of 40%-60% acrylic acid-maleic acid copolymer, 0-10% of 30%-60% alkyl imidazoline inhibitor, 0.1%-10% of zinc sulfate, 3%-40% of inorganic base and 10%-30% of sodium hexametaphosphate. The special solid corrosion and scale inhibitor disclosed by the invention is obtained by the raw materials through processes, such as kneading stirring, evaporating concentrating, shaping, drying and mixing. The inhibitor can be used for the water quality treatment of the oilfield reinjection water of a solid medication system, can be used for effectively reducing the decomposition of sodium hexametaphosphate in the storage period, and has very good corrosion resistance and scale inhibition effects on a reinjection water treatment system and a transportation system.

The invention relates to preparation of inorganic silicophosphate oligomer and application thereof; the preparation method of the inorganic silicophosphate oligomer comprises the following steps: in the room temperature, taking 10-50 parts of Na2SiO3 to be dissolved in 300-500 parts of water and stirred for 20 minutes; after solution is clear, adding 10-60 parts of Na3PO4 to be stirred for 60 minutes; after solution is clear, adding 1-5 parts of crosslinker to continue stirring for 3-4 hours, and then heating up to 60-80 DEG C, and keeping constant temperature for 8-12 hours; and dying the solvent by distillation to obtain white powder, putting the white powder into a high temperature furnace for roasting for 6-8 hours at the temperature of 800-1000 DEG C, and reducing to room temperatureto obtain transparent solid body, namely, the inorganic silicophosphate oligomer. The inorganic silicophosphate oligomer, a surface active agent and a polymer form new ternary compound system; and theinorganic silicophosphate oligomer and crude oil form ultra interfacial tension, thus greatly increasing crude oil recovery ratio, and simultaneously having corrosion inhibition and scaling resistance performances.

The invention belongs to the technical field of oilfield water treatment and relates to a scale inhibitor for oilfield water injection. The technical scheme includes that the scale inhibitor for oilfield water injection is characterized by being prepared from, by weight, 1-3 parts of amino trimethylene phosphonic acid, 1-2 parts of etidronic acid, 2-4 parts of ethylenediamine tetra(methylene phosphonic acid) sodium, 4-8 parts of ammonium molybdate, 6-10 parts of EDTA (ethylene diamine tetraacetic acid), 6-10 parts of polyaspartic acid, 1-3 parts of chitosan and 20-35 parts of water. The scale inhibitor for oilfield water injection is environment friendly.

A retarding-corrosion antiscaling compound for the surface-evaporating air cooler used in high-hardness and high-basicity circulating water system is prepared from zinc sulfate 15-25 wt. portions, acrylic acid-acrylate copolymer 30-36 portions, hydroxy-1-1-ethylene diphosphonic acid 34-46 portions, and benzotriazole 4-6 portions. It still exhibits good performance under the condition of relatively bad quality of circulating water. Its advantages are its effect little affected by turbidity, adapting to wide pH range, high effect, and low dosage.

The invention discloses a multifunctional phosphorus-free corrosion and scale inhibitor based on a humic acid derivative and a preparation method thereof. Humic acid and methacrylic acid are used as raw materials to synthetize polymethacrylate humate through polymerization and esterification reaction of free radicals under the effects of a catalyst and an initiator; and then, the polymethacrylatehumate is mixed with a synergistic effect material and a solvent to prepare the phosphorus-free corrosion and scale inhibitor. The synthesized polymethacrylate humate is a novel single corrosion and scale inhibitor; a great number of hydroxide radicals and carboxyls are contained in molecular structures; straight chains and branched chains alternately extend; and the molecular weight can be regulated and controlled through a formula design. The corrosion and scale inhibitor provided by the invention does not contain phosphorus, nitrogen or zinc, can realize zero-pollution-discharge operation,has a good corrosion and scale inhibition effect when being used in a circulating cooling water system, belongs to an environmental-friendly corrosion and scale inhibitor, and has a flocculation effect.

The invention relates to an environment-friendly chitosan compound containing corrosion and scale inhibitor and a preparation method thereof. The environment-friendly chitosan compound containing corrosion and scale inhibitor is prepared from, by weight, 35%-40% of a chitosan compound, 4%-6% of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid, 6%-10% of polyacrylate, 10%-15% of sodium gluconate, 3%-5% of soluble zinc salt and the balance distilled water. The environment-friendly chitosan compound containing corrosion and scale inhibitor is lower than 0.020mm.a<-1> in corrosion rate and higher than 98.4% in scale inhibition rate and has great corrosion and scale inhibition effects.

The invention relates to phosphate-free corrosion inhibition antisludging agent and a preparation method thereof. Phosphate-free corrosion inhibition antisludging agent is synthesized mainly by A and B; molar ratio of A and B is 2:1, wherein A is low molecular organic carboxylic acid or salt containing carboxylic group, sulfonic group or carbon-carbon double bond and B is one or more of quadrol, diethylenetriamine, and triethylene tetramine. The preparation method thereof is as follows: firstly, A is dissolved in ethanol, benzene, methylbenzene or dimethylbenzene, and switched to a three-neck flask; B is condensed with sodium dodecyl benzene sulfonate or sodium acetate; the condensed product is poured into the three-neck flask; the reaction temperature is controlled; the product is stirred for 1-3h in the temperature of 100 to 170 DEG C, and then the product reacts for 2-4h in the temperature of 160 to 200 DEG C, and finally is decompressed and distilled in the temperature of 80 to 160 DEG C to obtain claybank stringy liquid which is the product. The product is used for rotating hanging sample test of Q235 carbon steel; when dosage is 5mg-L, annual corrosion rate can be reduced to 0.080mm-a and corrosion inhabitation rate reaches 76.6%. When the product is combined with Zn saline solution, the corrosion inhabitation rate can reach 83% and the antisludging rate can reach 95%.

The invention discloses a phosphorus-free corrosion and scale inhibitor and a preparation method thereof, and belongs to the technical field of water treatment. The phosphorus-free corrosion and scaleinhibitor is prepared by mixing and complexing the components in parts by weight: 10-30 parts of a polyepoxysuccinic acid aqueous solution, 4-8 parts of citric acid and / or a citrate, 1-3 parts of 1H-benzotriazole, 5-15 parts of a zinc salt, 3-6 parts of imidazolinamide acetate, 5-10 parts of a maleic acid-acrylic acid-styrene sulfonic acid terpolymer and the balance deionized water. The phosphorus-free corrosion and scale inhibitor can be applied to water bodies with lower hardness, and the effect of corrosion and scale inhibition in water with water hardness as low as 150 mg / L (calculated based on calcium carbonate) is good.

The invention relates to a green water treatment agent with corrosion-inhibition and scale-inhibition performances and an application thereof, belonging to the field of treatment of water pollution. In order to overcome the technical problems of high production cost and poor application scope of a water treatment agent in the prior art, the compounded water treatment agent provided by the invention is composed of 0.5 to 1.5 parts of polyaspartic acid, 30 to 50 parts of sodium molybdate, 25 to 55 parts of triethanolamine, 10 to 16 parts of lignin sulfonate, 2 to 4 parts of sodium tripolyphosphate, 5 to 7 parts of mercaptobenzothiazole, 4 to 10 parts of polydimethyldiallylammonium chloride, 0.6 to 1.2 parts of cerium acetate, 3 to 9 parts of 1-phenyl-5-mercapto-tetrazole, 2.5 to 4.5 parts of 5-[3-phenyl-4-(2'-thiophene methine)imino-(1,2,4)s-triazole)thio-N-(2'-thiophene)methine acethydrazide and water. The green water treatment agent provided by the invention has the advantages of reasonable formula, excellent corrosion-inhibition and scale-inhibition performances after compounding, simple preparation method, low cost, and good application and popularization values compared with a conventional water treatment agent.

The invention belongs to the technical field of natural gas extraction, and particularly provides an anti-freezing corrosion inhibition foam drainage scale inhibitor and a preparation method thereof.The anti-freezing corrosion inhibition foam drainage scale inhibitor is prepared from the following components by mass: 15-20% of an organic phosphoric acid corrosion inhibitor, 15-20% of an organic phosphine corrosion inhibitor, 25-30% of a quaternary ammonium salt corrosion inhibitor, 4-10% of a scale inhibitor, 3-5% of an emulsifier, 15-20% of an ampholytic surfactant, and 5-10% of a dispersingagent. The problems that when a large gas field aims at the problems of wellbore scaling, wellbore corrosion, gas well drainage gas recovery and the like, injected traditional scale inhibitors, corrosion inhibitors and foam drainage agents are single in agent performance, tedious in injection system and large in agent injection workload and do not have the anti-freezing effect are solved, the functions of scale prevention, corrosion inhibition, corrosion prevention, foam drainage and freezing prevention are achieved, and the application prospect is wide. One-dose multi-effect is achieved, themedicament filling efficiency is improved, the medicament filling workload is reduced, the safety risk in the medicament filling process is reduced, and the problem that a traditional medicament is frozen in winter is solved.

The invention discloses a corrosion and scale inhibitor for a circulation cooling water system with desalted seawater as replenishing water. The corrosion and scale inhibitor comprises a component A and a component B, wherein the component A comprises 12-15% of polyaspartic acid, 10-15% of 2-aminoethyl-heptadecene imidazoline, 10-15% of an acrylic acid-maleic anhydride-2-acrylamide-2-methyl sodiumsulfonate copolymer, 5-10% of a itaconic acid-acrylic acid-beta-propylparaben copolymer, 3-5% of zinc chloride and 40-60% of softened water; the component B comprises 10-15% of an acrylic acid-isoprene sulfonic acid-acrylic acid-beta-propylparaben copolymer, 10-15% of S-carboxyalkylthiosuccinic acid, 10-15% of sodium benzoate, 3-5% of 4-phenol benzotriazole, 10-15% of sodium hydroxide and 35-57%of softened water; the mass ratio of the component A to the component B is 3:1. The corrosion and scale inhibitor disclosed by the invention is good in corrosion and scale inhibition property, the water resource is saved, and the service life of equipment is prolonged.

The invention belongs to the field of water treatment, and particularly relates to a low-phosphorous composite corrosion and scale inhibitor for circulating cooling water of a closed cooling tower and a preparation method of the low-phosphorous composite corrosion and scale inhibitor. The low-phosphorous composite corrosion and scale inhibitor comprises, by weight, 5-15% of N-sulfonic amino-dimethylenephosphonic acid, 5-20% of 2-hydroxyphosphonoacetic acid, 30-50% of polyglutamic acid, 5-10% of heptahydrate and the balance deionized water. The formula components of the low-phosphorous composite corrosion and scale inhibitor have obvious synergistic interaction, and the low-phosphorous composite corrosion and scale inhibitor is particularly applicable to a circulating cooling water system of the closed cooling tower; the problems of corrosion and scale formation of the system after long-time operation of the circulating cooling water can be solved effectively, indexes such as corrosion rate of carbon steel, copper, stainless steel and the like can meet national standards, the corrosion rate of the carbon steel is lower than 0.075mm / a, and the corrosion rates of the copper and the stainless steel are lower than 0.005mm / a; the content of phosphorus in the formula is low, and emission standards can be met without treatment; the production process is simple, and product stability is high.

The invention discloses a phosphorus-free water treatment agent for high-concentration iron ion circulating water. The phosphorus-free water treatment agent comprises a scale and corrosion inhibitor and a high-efficiency dispersing agent, and the adding concentration of the phosphorus-free water treatment agent is 5-20mg / L in terms of supplemented water. The scale and corrosion inhibitor comprises10%-20% of a non-phosphorus scale inhibitor, 30%-40% of an organic corrosion inhibitor, 1%-5% of a copper corrosion inhibitor, 1%-5% of an inorganic corrosion inhibitor and 30%-58% of deionized water. The efficient dispersing agent is prepared from 20%-30% of an organic polymer, 10%-20% of iron ion organic complexing agent and 50%-70% of deionized water. The organic polymer in the phosphorus-freeagent is capable of stabilizing iron ions in circulating water, so that under-scale corrosion caused by forming of stains on equipment surfaces by iron ions is prevented; the iron ion complexing agent is capable of complexing free iron ions in circulating water, disturbing the reaction of Fe<3+> and Fe, and relieving corrosion and the like problems caused by the iron ions in the circulating water.

The invention relates to a high-efficiency grey water dispersing agent which is a composition consisting of 40-60 percent of acrylic acid-2-polyscrylide-2-methyl acrylsulfonate, 15-35 percent of 2-phosphate-1,2,4-tricarboxylic acid butane, 5-25 percent of amino trimethylene phosphonic acid, 5-15 percent of hydroxyethylidene-1,1-diphosphonic acid and 5-15 percent of hydrolytic polymaleic anhydride. The dispersing agent is stable in property under the conditions of 40MPa and 250 DEG C, has a high dispersing capacity at the high temperature of 300 DEG C, has a good dispersing function on high-basicity, high-hardness, high-PH value and high ash content and high concentration multiple under the required high-concentration times in a water-coal-slurry pressurization and gasification device, can effectively delay the scale forming tendency and is applicable to a circulating cooling water system in industries such as power, metallurgy and papermaking. The addition in a water system is determined according to the water quality and working conditions, and the amount is 50-80mg / l according to the flow sum of a low-pressure grey water pump and a high-pressure grey water pump.

The present invention provides a composite efficient low-phosphorus corrosion-inhibiting and scale-inhibiting agent for low hardness water, wherein the components comprise, by mass, 15-25% of a heptadecenyl hydroxyethyl imidazoline quaternary ammonium salt, 5-15% of a phosphono carboxylic acid copolymer, 10-20% of an acrylic acid-acrylate-sulfonate copolymer, 0.1-1.5% of benzotriazole, 5-15% of anhydrous zinc chloride, 1-3% of a co-solvent, and the balance of water. According to the present invention, the composite efficient low-phosphorus corrosion-inhibiting and scale-inhibiting agent is suitable for water with characteristics of low hardness, high alkalinity and strong corrosion, has alkalinity of less than 600 mg / L, and has excellent corrosion inhibition and excellent scale inhibition; and the total phosphorus content in the composite efficient low-phosphorus corrosion-inhibiting and scale-inhibiting agent of the present invention is lower than the total phosphorus content in the organic phosphates and the phosphate agents, the total phosphorus content in the industrial discharge water is less than or equal to 1.0 mg / L, and the composite efficient low-phosphorus corrosion-inhibiting and scale-inhibiting agent has characteristics of biodegradability, no pollution, environmental protection, low cost, easy compounding, good stability, less consumption, good synergy among various components, stable performance, excellent corrosion inhibition, and excellent scale inhibition.

The invention relates to the field of circulating cooling water treatment, and discloses a phosphorus-free composite anti-scaling corrosion inhibitor and application thereof and a treatment method ofcirculating cooling water. The phosphorus-free composite anti-scaling corrosion inhibitor contains carboxymethyl inulin sodium, a cyclodextrin derivative and a copolymer. The copolymer comprises a structural unit provided by a thiourea derivative represented by the formula (I), a structural unit provided by a C3-C10 unsaturated carboxylic acid and a structural unit provided by C4 to C10 acrylate.The application is the application of the phosphorus-free composite anti-scaling corrosion inhibitor in treatment of the circulating cooling water; the treatment method of the circulating cooling water includes addition of the phosphorus-free composite anti-scaling corrosion inhibitor into the circulating cooling water. The phosphorus-free composite anti-scaling corrosion inhibitor exhibits good comprehensive performance of scale inhibition and corrosion inhibition, and when applied to the circulating cooling water, can not only meet the requirements of the circulating cooling water for scaleinhibition and corrosion inhibition, but also can avoid the environmental problems caused by phosphorus-containing agents in the prior art.