199results about How to "Good scale resistance" patented technology

The invention relates to a phosphorus-free corrosion and scale inhibitor, which is prepared from sodium molybdate, zinc salt, citrate, triethanolamine, benzotriazole (BTA), polyaspartic acid (PASP), polyepoxysuccinic acid (PESA), AA / AMPS terpolymer, solid alkali and water. The phosphorus-free corrosion and scale inhibitor inhibits corrosion of metals by forming oxidization type and precipitation type films on the surfaces of the metals, has the effect of inhibiting scale through chelation and dispersive action on salts causing scale in cooling water, is non-toxic and phosphorus-free, has easily biodegradable major organic compositions, does not cause environmental pollution and is not limited by phosphorus in emission.

An alkaline concentrated detergent composition for use in cleaning hard surfaces, medical instruments and other metal components (parts, tools, utensils, vessels, equipment) having superior cleaning efficacy at much lower alkali content than traditional alkaline cleaners and enhanced scale control properties even when diluted to about 1 / 40 ounce per gallon to about 1 / 10 ounce per gallon in potable water and even in exceptionally hard water. The inventive composition maintains its superior cleaning efficacy and scale control properties during use.

The invention provides antisludging agent and the application method thereof. The antisluding agent comprises polyether polyamino methylene phosphonates, polyepoxysuccinic acid, Aroset and organic phosphonic acid. The antisludging agent is applicable in the water quality with dense calcium, dense sulfate radical and soluble silica, and has great antisludging and dispersing effect. The antisludgingagent which is led into the high-density reverse osmosis water treatment system is added to effectively restrict polcard, sulfate, silicate and other inorganic salts from being deposited and foulingon the film surface, thereby prolonging the cleaning period of the reverse osmosis film.

The invention relates to a salt tolerant corrosion and scale inhibitor for underground oil-gas wells and a preparation method thereof. The salt tolerant corrosion and scale inhibitor is composed of an oxazoline derivative, thiourea, cetyl pyridinium chloride, dodecyl dimethyl benzyl ammonium chloride, amino trimethylene phosphonic acid, hydroxyethylidene diphosphonic acid, hexamethylenetetramine, and methanol. The corrosion and scale inhibitor has very strong salt resistance, and under high salinity conditions (100000-200000mg / L), has a significant inhibiting effect on metal corrosion, and the corrosion inhibition rate can reach more than 80%. The organic phosphonic acid molecular structure of the reagent contain a double bond structure, the structure and the calcium ions and magnesium ions in water can chelate to form a stable complex to be adsorbed on seed crystal surface active sites, thereby inhibiting crystal normal growth. With significant scale inhibiting effect and a scale inhibiting rate up to 94%, the product is suitable for inhibiting corrosion and scaling phenomena of oil-gas well rods and pipes containing carbon dioxide, hydrogen sulfide and other complex media conditions under high salinity.

The invention introduces a phosphorus-free composite corrosion and scale inhibitor containing natural biodegradable substances. The phosphorus-free composite corrosion and scale inhibitor consists of the following raw materials in a mixing way: zinc sulfate or zinc nitrate, alkyl glycoside, polyaspartic acid, carboxymethylcellulose, polyepoxysuccinic acid, polymerized amino acid, sodium gluconate, methylbenzotriazole or benzotriazole, and water or deionized water. The raw materials are nontoxic, natural, renewable and degradable. The phosphorus-free composite corrosion and scale inhibitor has the advantages of no toxicity, no harm, biodegradability, stable performance, wide raw material source and the like. The synergistic effect of all compositions is fully utilized to improve the performance and reduce dosage. When the phosphorus-free composite corrosion and scale inhibitor is used for circulating cooling water treatment, calcium carbonate, calcium sulfate and calcium phosphate can be prevented from being deposited, the scale inhibition effect is obvious and the corrosion inhibition performance is excellent. The eutrophication of the water body can be effectively avoided, the used amounts of germicide and algaecide are reduced and the economic benefit is remarkable.

The present invention discloses a phosphorus-free, green and environment-friendly slow-release scale inhibitor, which comprises the following raw materials in weight part: 5-20 parts of maleamic acid, 5-10 parts of chitosan, 2-5 parts of lignin, 1-10 parts of starch, 3-15 parts of sodium humate, 1-3 parts of polyacrylic acid, 2-10 parts of sodium molybdate, 1-5 parts of zine stearate, 4-10 parts of zinc borate, 3-12 parts of sodium lactate, 1-8 parts of triethanolamine, 3-10 parts of benzotriazol, 5-20 parts of polyaspartic acid, 3-12 parts of S-CETSA, 10-25 parts of polyepoxysuccinic acid, 2-15 parts of acrylic acid-2-acrylamide-2-methyl propane sulfonic acid copolymer and 50-70 parts of water. The phosphorus-free, green and environment-friendly slow-release scale inhibitor is phosphorus-free, non-toxic, green, environmentally-friendly, and good in scale-inhibition and slow-release effect.

The invention provides a reverse osmosis compound scale inhibitor and belongs to the field of reverse osmosis water treatment. The scale inhibitor comprises the following components in percentage by weight: 10 to 20 percent of 1-hydroxyethylidene-1,1-diphosphonic acid, 30 to 40 percent of hydrolytic polymaleic anhydride, 30 to 40 percent of polyacrylic acid and 10 to 20 percent of sulfonated styrene-maleic anhydride copolymer, and the scale inhibitor comprises also comprises a bactericide. The reverse osmosis compound scale inhibitor fully utilizes the synergistic effect among organic phosphorous scale inhibitors, polycarboxylic acid scale inhibitors and sulfonic acid scale inhibitors, has good scale inhibition and dispersion performance; and when used in a reverse osmosis water inflow system, the scale inhibitor can effectively lighten pollution of calcium carbonate, calcium sulfate and silicate to reverse osmosis membranes and prolongs the cleaning period and service life of the reverse osmosis system.

The invention relates to a barium strontium sulphate scale inhibitor for an oil field and an application thereof. The barium strontium sulphate scale inhibitor comprises the following components in percentage by weight: 0.05-0.10% of polyepxoysuccinic acid, 0.01-0.03% of polyamino polyether methylene phosphonate, 0.02-0.05% of a ZG-558 scale inhibitor, 0.01-0.02% of quaternary ammonium salt and the balance of water; and working concentration is 50-120mg / l when the barium strontium sulphate scale inhibitor is used for inhibiting barium strontium sulphate scale at a gathering and transportation station of the oil field. The barium strontium sulphate scale inhibitor provided by the invention can effectively realize barium strontium sulphate scale inhibition with high sulphuric acid content (SO4<2-> is less than or equal to 1600mg / l) and high barium content (the ratio of Ba<2+> to Sr<2+> is less than or equal to 1800mg / l), and scale inhibition rate is more than 70%.

The invention discloses a preparation method of a multiple-effect compound type corrosion and scale inhibitor. The preparation method is characterized in that the scale inhibitor is of a compound type and comprises the following components in percent by volume: 22%-32% of polyepoxysuccinic acid, 10%-18% of ethylenediamine tetramethylene phosphonic acid, 35%-50% of itaconic acid-maleic acid-crylic acid-methyl acrylate polymer, 10%-18% of tree-shaped polyamide-amine, and the balance of water, and sodium hydroxide is used for adjusting the pH. The invention also discloses the multiple-effect compound type corrosion and scale inhibitor which has an excellent scale inhibiting effect on BaSO4, SrSO4, CaCO3, MgCO3, SiO2 and Ca3(PO4)2, also has the characteristics of corrosion inhibiting performance, high temperature resistance, good stability and the like, and have no three-waste emission in the whole production process. The preparation method for treating complex water quality disclosed by the invention has the advantages of simple scale inhibiting process, low agent using amount, low cost and good effect, and has better economic benefit and wide social benefit.

The invention discloses a biodegradable non-phosphorous anti-scale corrosion inhibitor and a preparation method thereof. The biodegradable non-phosphorous anti-scale corrosion inhibitor comprises, by mass, 10-20% of polyaspartic acid, 5-20% of polyepoxysuccinic acid, 30-60% of copolymers, 5-10% of zinc salt, 2-5% of fluorescent tracers and the balance water, wherein the molecular weight of the copolymers ranges from 2000-10000, and the copolymers are maleic anhydride / acrylic acid / acrylic acid oxylactone / 2-acrylamide-2-methylpro panesulfonic acid quaternary copolymers. The non-phosphorous anti-scale corrosion inhibitor is used for stainless steel condenser circulating cooling water systems of thermal power plants, is non-phosphorous, non-toxic, easily biodegradable, free from environmental problems and unlimited in discharge, and is capable of controlling carbon steel corrosion rate to be smaller than or equal to 0.075mm / a, controlling corrosion rate of copper, copper alloy and stainless steel to be smaller than or equal to 0.005mm / a, controlling dirt deposition rate to be smaller than or equal to 15mcm and controlling scale inhibition rate to be larger than or equal to 80%.

The invention relates to a scale and corrosion inhibitor using recycled water as circulating cooling water in a fired power plant, a method and an application thereof. The recycled water is civic recycled water which is used as the circulating cooling water in the fired power plant in the manner of moisturizing, wherein the scale and corrosion inhibitor contains two sets of components: the first set of component contains organic phosphonate, polycarboxylic polybasic copolymer, zinc salt and water which is used as the solvent, and the second set of component contains copper corrosion inhibitor. The two sets of components are separately packaged. The scale and corrosion inhibitor can efficiently prevent calcium carbonate, scatter calcium carbonate crystallite, change the state of the calcium carbonate crystallite and prevent the generation of ferric oxide and calcium phosphate scale. The invention has the function of preventing the scale and corrosion of the civic water which is rich in salt, ammonia nitrogen and COD, is high in basicity and hardness and has strong anti-corrosion property. The scale and corrosion inhibitor of the invention can meet the demand of inhibiting scale and corrosion by only using 10 to 50 mg / l, so the industrial water usage and cost are saved and the benefit is high.

The invention discloses a non-phosphorus type environment-friendly slow-release scaling inhibitor which is prepared from the following components: tannin, polyacrylic acid, ammonium salt, D-erythorbic acid, silicate, a non-phosphorus polymeric corrosion inhibitor, a maleic acid-crylic acid copolymer, fatty alcohol-polyoxyethylene ether, zinc salt, a dispersing agent and deionized water. The non-phosphorus efficient slow-release scaling inhibitor with safe and environment-friendly components is provided, due to the reasonable design, all the substances in the formula can be prepared into the environment-friendly corrosion inhibitor with a good corrosion inhibition effect and high storage stability.

The invention relates to a scale and corrosion inhibiting agent for the circular cooling water of an oxygen preparation plant as well as a method and an application thereof, which are characterized in that the scale and corrosion inhibiting agent comprises the following components: organic phosphonate, polycarboxylic acid multicomponent copolymer, copper corrosion inhibiting agent, zinc salt, polyaspartic acid and water, wherein the water is solvent. The scale and corrosion inhibiting agent can effectively prevent the formation of calcium carbonate, disperse calcium carbonate microcrystals, change the crystallization state of the calcium carbonate and have favorable performance for preventing the formation of calcium carbonate scale in the circular cooling water. The invention has the effect of preventing calcium carbonate incrustation under the complicated condition that the circular cooling water of the oxygen preparation plant is not only used by a high-temperature heat exchanger, but also used by low-temperature freezing water equipment and low-temperature equipment. Only 10-50 mg / L of scale and corrosion inhibiting agent can achieve the requirement of scale and corrosion inhibition, and the invention greatly saves the industrial water consumption amount and the economic cost and has favorable economic and social benefits.

The invention relates to a barium-strontium scale inhibitor, belongs to the technical field of industrial water treatment agent designing and is especially suitable for water containing barium-strontium scale and calcium-barium-strontium composite scale in the oil field. A terpolymer and poly(sodium epoxysuccinate) are compounded according to a mass percent ratio of 1: 0.1-5.0 to form the barium-strontium scale inhibitor. Maleic anhydride is added with acrylic acid or methacrylic acid and acrylic acid ester and the mixture undergoes a copolymerization reaction under the action of potassium persulphate as an initiator to produce the terpolymer. A hydrolysate of maleic anhydride and sodium hydroxide is added with sodium tungstate as a catalyst and hydrogen peroxide as an oxidizing agent, the mixture undergoes a reaction to produce sodium epoxysuccinate, the sodium epoxysuccinate is added with a sodium-calcium compound alkali as an initiator and the mixture undergoes a polymerization reaction to produce the poly(sodium epoxysuccinate). The barium-strontium scale inhibitor does not contain phosphorus, has a small use amount and good effects, can be effectively used for preventing barium-strontium scale, calcium scale and calcium-barium-strontium composite scale in the oil field, has excellent barium-strontium scale inhibition performances, has a low cost, can be prepared by a simple method and is environmentally friendly.

The invention provides a scale and corrosion inhibitor and application of the scale and corrosion inhibitor in a salt draining closed conduit of a saline and alkaline land. The scale and corrosion inhibitor comprises the components in parts by weight: 26-29 parts of ursolic acid, 15-18 parts of rosmarinic acid, 4-6 parts of trifluoroacetic acid, 6-8 parts of bis-1,6-hexylidenetriamine pentamethylene sodium phosphonate, 3-5 parts of thionothiolic acid, 1-3 parts of mannitol, 8-12 parts of polyepoxysuccinic acid, 6-9 parts of sodium benzotriazole, 2-4 parts of propyl hydroxybenzoate and 50-60 parts of water, wherein the purity of ursolic acid is 98%; the purity of rosmarinic acid is 95%; and the solid content of sodium benzotriazole is 40%. By using the scale and corrosion inhibitor provided by the invention, the corrosion rate, which is 0.0006-0.0009 mm / a, of the salt draining closed conduit is obviously reduced, and the service life of the salt draining closed conduit can be prolonged by 10 years.

The invention discloses a composite corrosion and scale inhibitor for an open type cooling water system made of a galvanized pipe, a preparation method and application thereof. The composite corrosion and scale inhibitor for the cooling system comprises the following components in percentage by weight: 1 to 20 percent of organophosphorus carboxylic acid, 1 to 30 percent of polycarboxylic acid, 1 to 10 percent of organic multicopolymer, 1 to 10 percent of methylbenzotriazole, 1 to 15 percent of polyhdric alcohol phosphate ester, 0.1 to 1 percent of zinc element in a zinc source, and the balance of water. The composite corrosion and scale inhibitor is suitable for the corrosion and scale inhibition treatment on the open type cooling water system made of the galvanized pipe, has good corrosion inhibition effect on a galvanized layer of the inner wall of the pipe of the cooling water system, and still has good scale-inhibiting effect when satisfying high concentration factor, high alkalinity, high hardness and high pH value at the same time.

The invention discloses an environment-friendly metal corrosion inhibitor and a preparation method thereof. Inedible cassava starch, canna edulis ker starch and the like are used as raw materials; the raw materials and acrylamide undergo graft copolymerization reaction under the action of a catalyst to form the metal corrosion inhibitor; the catalyst is potassium peroxydisulfate-sodium hydrogensulfite or ammonium persulfate-sodium hydrogensulfite; and the molar ratio of the potassium peroxydisulfate or the ammonium persulfate to the sodium hydrogensulfite is 1:0.5-1:1.5. The product can effectively prevent the corrosion of a metal material, and has the characteristics of low consumption, high corrosion inhibiting efficiency and the like compared with the current common corrosion inhibitor. Meanwhile, the corrosion inhibitor has wide raw material source and low price, is regenerative and non-toxic, can be fully decomposed by organisms and form virtuous circle in the nature, and has good application prospect.

The invention provides a methanesulfonic acid-ammonium hydrogen fluoride acid liquid system. The acid liquid system is prepared from components, by weight of 100 g of the solution, as follows: 1-95.6 g of methanesulfonic acid, 0.6-3 g of ammonium hydrogen fluoride, 0.6-3 g of organic acid, 0.15-0.2 g of a ferrous stabilizer, 0.5 g of a discharge aiding agent for acidification, 0.5 g of a foaming agent, 0.5 g of a clay stabilizer, 1.5-2 g of a corrosion inhibitor for acidification, 0.05-0.1 g of a composite scale inhibitor and the balance of solvent water. The provided methanesulfonic acid-ammonium hydrogen fluoride acid liquid system has good corrosion capability, has a certain retardance effect, a deep acidification function on a reservoir and a protection function on an underground tubular column and also has a good anti-scaling function.

The invention discloses a biodegradable temperature-sensitive hydrogel and method for preparing same which comprises, preparing microporous konjak gluglucosan aquogel, dissolving refined konjaku flour into distilled water, agitating, charging inorganic solvent, adjusting pH, carrying out crossbridging under a controlled temperature and time, water scrubbing the product yield, repeated frost thawing, freeze-drying, then swelling the konjak gluglucosan gel into the aqueous solution of N-isopropyl acrylamide, cross linking agent, and initiating agent, carrying out polymerization under a controlled temperature and time, and water scrubbing the obtained outcome yield.

The invention discloses a method for preparing polyacrylic acid-2-acrylamide-2-methyl propanesulfonic acid. The method mainly comprises the following steps: 5 to 30 mass percent of crylic acid, 1 to 15 mass percent of 2-acrylamide-2-methyl propanesulfonic acid, 0.5 to 6 mass percent of persulfate, 0.2 to 3 mass percent of sodium sulfite, 0.05 to 3 mass percent of L-ascorbic acid, 0.5 to 9 mass percent of ethanol, 0.5 to 3 mass percent of dodecyl mercaptan and 50 to 85 mass percent of water are mixed to have polymerization reaction for not less than one hour at a temperature of between 35 and 60 DEG C to obtain the polyacrylic acid-2-acrylamide-2-methyl propanesulfonic acid. The method has the advantages the polyacrylic acid-2-acrylamide-2-methyl propanesulfonic acid with low molecular weight is synthesized once, has low starting reaction temperature, less energy consumption, rapid reaction speed, high utilization efficiency of equipment, a simple process and convenient operation.

The invention provides an oilfield reinjection water scale inhibitor and a preparation method thereof. The scale inhibitor consists of styrene sulfonic acid (SSS), polyepoxysuccinic acid (PESA), polyaspartic acid (PASP) and 2-phosphonic butane-1,2,4-tricarboxylic acid (PBTC), wherein the mass ratio of the SSS, PESA, PASP and PBTC is (30-50):(15-25):(20-30):(5-10). The invention provides the preparation method for the oilfield reinjection water scale inhibitor. The four materials are sequentially added into a stirring container at a certain mass ratio, stirred and dissolved to obtain the scale inhibitor. The scale inhibitor is a super concentrated liquid agent, and can be infinitely diluted for use. The four materials are compounded at a certain mass ratio, so that the scale inhibiting effect of the scale inhibitor is obviously superior to that of a single material; the consumption of the scale inhibitor is lower than that of any domestic existing oilfield reinjection water scale inhibitor, so that the agent cost of oilfield development can be saved. The oilfield reinjection water scale inhibitor disclosed by the invention has a stable hydrolysis effect under the condition of high hardness, high alkalinity and high temperature, an excellent scale inhibiting dispersion effect on calcium carbonate and calcium phosphate and good effects of dispersing iron oxide and stabilizing zinc salts, so that the scale inhibitor can be widely applied in the field of oilfield reinjection water and conventional water treatment and the like.

The invention relates to a phosphorus-free scale and corrosion inhibitor simultaneously effective for copper and carbon steel. The scale and corrosion inhibitor comprises the following components in parts by weight: 5 to 15 parts of borate, 10 to 18 parts of gluconate, 8 to 12 parts of inorganic zinc salt, 0.5 to 2 parts of methyl benzotriazole, 8 to 19 parts of scale inhibitor, and 0.1 to 1 part of surfactant. The scale and corrosion inhibitor can protect copper and carbon steel of a system at the same time. After the scale and corrosion inhibitor is used, the corrosion speed of carbon steel is reduced to less than 0.02 mm / a, the corrosion speed of copper is reduced to less than 0.005 mm / a, and the inhibition rate can reach 98% or more. The scale and corrosion inhibitor has a good scale inhibition performance, and the scale inhibition rate is more than 90% in a fourfold concentration experiment. The provided scale and corrosion inhibitor solves the problems of scaling and corrosion of a system, the corrosion inhibiting performance and scale inhibiting effect are both better than national and industrial standards, moreover, the scale and corrosion inhibitor does not contain any phosphorus or rare earth element, zero discharge of phosphorus is realized, and the scale and corrosion inhibitor has a very high industrial value and generates good environment protection benefits.

The invention discloses a multi-component polymerized scale inhibitor. The multi-component polymerized scale inhibitor is characterized in that: the scale inhibitor which is a quarternary polymerized compound comprises the following components, by mass, 25-35 parts of acomitic acid, 12-20 parts of acrylic acid, 15-22 parts of methyl acrylate, 8-15 parts of sodium alkyl sulfonate, 5-9 parts of ammonium persulfate, 5-10 parts of isopropanol, and 70-150 parts of water, and the pH of the scale inhibitor is adjusted by sodium hydroxide. The invention also discloses a preparation method of the multi-component polymerized scale inhibitor. The scale inhibitor which is prepared in the invention has an excellent scale inhibition effect on BaSO4 scales and SrSO4 scales, has an obvious scale inhibition performance on Ca3(PO4)2 and CaCO3, has the characteristics of corrosion inhibition, high temperature resistance, controllable molecular weight, no phosphorus and the like, and no three wastes are discharged in the whole production process of the scale inhibitor. The scale inhibitor of the invention, which has the advantages of simple technology, less dosage, low cost and good effect when the scale inhibitor is used to process industrial circulating water, oilfield water and the like, has good economic benefits and wide social benefits.

The invention discloses a non-phosphorus composite corrosion and scale inhibitor suitable for industrial circulating cooling water. The corrosion and scale inhibitor comprises 25-45% of naphthalenesulfonic acid-formaldehyde condensate (SNF), 5-15% of acrylic acid-2-acrylamido-2-methylpropane sulfonic acid copolymer (AA / AMPS), 10-20% of polyepoxysuccinic acid (PESA), 8-30% of zinc salt, 0.5-2% of azole compound and the balance of water by weight percent. By using the non-phosphorus composite corrosion and scale inhibitor, the circulating cooling water does not have phosphorus or nitrogen and is discharged without consideration of environmental problems. The non-phosphorus composite corrosion and scale inhibitor is efficient and environment-friendly.

The invention relates to a scale inhibitor and dispersant for a wet process phosphoric acid filter system. The scale inhibitor and dispersant is characterized by comprising the following raw material components in percentage by weight: 5%-15% of organic phosphoric acid, 40%-65% of phosphorus-containing polymer, 25%-40% of sulfonic acid copolymer, 0.05%-0.5% of aluminum slat and 4-10% of water. The adding amount of the scale inhibitor and dispersant is 0.005%-0.02% of wet process phosphoric acid; and the scale inhibitor and dispersant disclosed by the invention can effectively prevent the scale formation phenomenon of the filter system during the production of the phosphoric acid, has no influence on subsequent working sections and has good application prospects.

The invention relates to a biodegradable antisludging inhibitor, namely an olefin-containing poly(aspartic acid) derivate and a preparation method thereof. The preparation method for the olefin-containing poly(aspartic acid) derivate comprises the following steps: (1) an aspartic acid is taken as a raw material and subjected to thermal polycondensation to generate polysuccinimide; (2) a sodium hydrogen aspartate solution is prepared; (3) an olefin-containing poly(aspartic acid) derivate aqueous solution is generated by utilizing aminolysis reaction; and (4) alcohol extraction, filtration and drying are performed. The olefin-containing poly(aspartic acid) derivate has the advantages that: due to introduction of an aspartic acid group in a poly(aspartic acid) structure of the olefin-containing poly(aspartic acid) derivate, the olefin-containing poly(aspartic acid) derivate improves the scale inhibition and dispersion capacities, and has good scale inhibition effect, good biodegradability and corrosion inhibition and strong heat resistance. The preparation method is simple. Moreover, the product can be widely applied in the aspects of circulating and cooling water systems, boiler water, oil field water, seawater desalination and so on.

The invention discloses a glauberite pipeline scale descaling agent and application thereof. The descaling agent comprises the following components in percentage by weight: 10-25% of NaOH, 5-15% of Na2S2O35H2O, and 0.05-0.5% of sodium polyacrylate. The descaling agent provided by the invention can be used for transforming insoluble CaSO4 into soluble Ca(OH)2 and Na2SO4; a proper amount of Na2S2O35H2O serving as a complexing agent is added and complexed with Ca<2+> in Ca(OH)2 to form a more stable complex, a new precipitate is prevented from generating, and a dissolution reaction is promoted to happen; a proper amount of EDTA (ethylene diamine tetraacetic acid) and a proper amount of polyacrylamide are added to realize a more remarkable scale inhibition effect; and acid is not contained in the components of the descaling agent, and no acid is generated in the descaling process, so that the descaling agent has small corrosive influence on a salt manufacturing pipeline and small influence on the mechanical performance of the salt manufacturing pipeline; and after being subjected to simple sediment treatment, a residual solution obtained after filtering can be returned to a bittern pre-treatment system, so that the alkaline solution in the residual solution can be utilized, so that sewage is hardly drained, and the descaling agent is environmentally-friendly.

The invention is a preparation method for a hyperbranched polycarboxylic acid polymer scale inhibitor. The scale inhibitor has good scale inhibition property for calcium carbonate, calcium phosphate, calcium sulfate, barium sulfate, strontium sulfate and so on, and has high tolerability for calcium ion. Moreover, the scale inhibitor has no affection on water quality, has characteristics of simple synthetic technology, small amount and the like, and can be used for processing industrial water with complex scale and high scale-forming ion concentration.

The invention belongs to the field of scale inhibitor materials and discloses a controllable slow-release polyphosphate scale inhibitor and a preparation method thereof. The preparation method includes the steps of uniformly mixing calcium oxide, concentrated phosphoric acid, silicon dioxide and aluminum oxide, enabling the raw materials to react with one another at 80-100 DEG C for 1-2 hours, raising the temperature to 1,300-1,600 DEG C for a high-temperature fusion polymerization reaction for 2-4 hours, pouring obtained reactants into a mold for molding, and conducting annealing and coolingto obtain slow-release polyphosphate; grinding the obtained slow-release polyphosphate into powder and then adding an adhesive for extrusion granulation to obtain the controllable slow-release polyphosphate scale inhibitor. The controllable slow-release polyphosphate scale inhibitor has the advantages of good scale inhibition effect, long effective period, low cost and the like. Moreover, the related preparation method is easy to operate, and the scale inhibitor is suitable for scale inhibition in the fields of drinking water treatment, industrial water treatment and the like and has an important practical application value.