30results about How to "High calcium tolerance" patented technology

The invention provides an anti-scale agent for a water-in-oil system in an oilfield high-temperature environment as well as a preparation method and a use of the anti-scale agent. The anti-scale agent is characterized by being prepared from bis(1,6-hexamethylene triamine penta(methylene phosphonic acid)), a phosphinoacrylic acid multipolymer, poly(epoxy sulfocarboxylic acid), 2-phosphonobutane-1,2,4-tricarboxylic acid and alkylphenol polyoxyethylene ether, wherein the total content of the active constituents of the anti-scale agent is not lower than 40%. The preparation method comprises the following steps: orderly adding the raw materials, mixing evenly, adjusting the pH value to 7, stirring for 20 minutes, cooling until the temperature reaches a room temperature, next, adding water, and finally, adding the emulsifier alkylphenol polyoxyethylene ether and stirring for 15 minutes to obtain the anti-scale agent. The anti-scale agent is applied to the scale prevention use of the water-in-oil system in the high-temperature environment of 200 DEG C and below, and in terms of the water quantity in the oil-water mixture, the use amount of the anti-scale agent is 60-100mg / L.

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 and60 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 relates to a composite anti-scaling agent of a reverse osmosis membrane, and an application thereof. The composite anti-scaling agent comprises a component a and a component b, wherein the component a comprises at least one selected from methylene phosphonic carboxylic acid, the general formula of the component a is RCH(COOH)N(CH2PO3H2)2, the RCH(COOH)N is selected from an amino acid, the component b comprises at least one material selected from an organic phosphonic acid polymer and / or an organic carboxylic acid polymer. With adopting the composite anti-scaling agent of the present invention to carry out water treatment for a reverse osmosis system, the problems of CaCO3 deposition and CaSO4 deposition on the reverse osmosis membrane can be solved, the membrane pollution due to the CaCO3 deposition and the CaSO4 deposition can be eliminated, the work efficiency of the reverse osmosis system can be improved, the service lives of the reverse osmosis membrane and the reverse osmosis equipment can be prolonged, and the reverse osmosis cost can be reduced.

The invention discloses composite type phosphorous-free corrosion and scale inhibitor.The composite type phosphorous-free corrosion and scale inhibitor is composed of, by weight, 20-30 parts of S-carboxyalkylthiosuccinic acid (CETSA), 10-15 parts of sodium gluconate, 5-8 parts of sodium benzoate, 10-20 parts of hydroxy-propyl acrylate (HPA), 5-10 parts of zinc sulfate and 35-45 parts of water.CETSA is good in water solubility and biodegradability and has good corrosion and scale inhibition performance within a wide pH range, and particularly after CETSA is compounded with sodium gluconate, hydroxy-propyl acrylate (HPA), Zn salt and the like, the corrosion inhibiting rate is remarkably raised.Under the conditions that the temperature is 45 DEG C and the mass fraction is 20 micrograms / g, the corrosion inhibiting rate of the composite type phosphorous-free corrosion and scale inhibitor can reach 93.2%, and the scale inhibiting rate reaches 98.5%.

The invention relates to an oilfield scale inhibitor, as well as preparation method and application thereof. The the oilfield scale inhibitor comprises the following components in weight percent: 5%-30% of 2-phosphonic acid-1, 2, 4- tricarboxylic acid, 2%-4% of emulsifying agent OP-10, 20%-40% of sulfonated styrene and the balance of water. The preparation method for the oilfield scale inhibitor comprises the following steps: heating water to 60 degree C, sequentially adding 2-phosphonic acid-1, 2, 4- tricarboxylic acid, the emulsifying agent OP-10 and sulfonated styrene, stirring until the mixture is uniform, and finally obtaining the oilfield scale inhibitor. The invention further provides application of the oilfield scale inhibitor for high-temperature water scaling prevention in the oilfield. The oilfield scale inhibitor provided by the invention has excellent thermal stability, high calcium tolerance and compatibility with oilfield water, has the functions of scale inhibition, corrosion inhibition and dispersion under high temperature, and can satisfactorily control the scaling problem of high temperature oilfield water.

The invention provides a hyperbranched reverse osmosis scale inhibitor with a network structure, which is characterized in that it is prepared from the following components: acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, poly The mixture of amino polyether group methylene phosphonic acid and organic phosphine derivatives, the mass ratio of tricarboxylic acid is 2~2.5:1:0.5~1; the quality of water is acrylic acid-2-acrylamide-2-methyl 1 to 1.5 times the mass of propanesulfonic acid copolymer, mixture of polyamino polyether group methylene phosphonic acid and organic phosphine derivatives, and tricarboxylic acid; the mass of the crosslinking agent is 0.5 of the mass of water ~1%; the concentration of inorganic acid catalyst in water is 0.5~1mol / L. The scale inhibitor can effectively prevent the fouling of the reverse osmosis membrane by carbonate, sulfate, metal oxide and silicon dioxide, and the scale inhibitor can effectively kill bacteria.

The invention relates to a cleaning agent composition, comprising an A agent and a B agent. The A agent and the B agent are stored independently. The A agent comprises a non-ionic surfactant and a dispersing agent, wherein the non-ionic surfactant is a fatty alcohol-polyoxyethylene ether; and the dispersing agent is selected at least one from an organic phosphonic acid, a poly-aspartic acid, a polyepoxysuccinic acid and a co-polymer and / or a homopolymer obtained by polymerization of at least one of an unsaturated organic acid, an unsaturated organic acid ester and an unsaturated organic acid anhydride. The B agent contains a foaming agent. The invention also relates to a method for cleaning a reverse osmosis membrane by using the above cleaning agent composition. A cleaning liquid prepared by the cleaning agent composition can clean the reverse osmosis membrane effectively, makes water yield of a reverse osmosis system restore basically, and can significantly reduce front-and-back pressure difference of the reverse osmosis membrane and reduce conductivity of produced water.

A trimethylolpropane core, phosphonic acid terminated dendrimer and its preparation method are provided, And a preparation method thereof comprises steps of processing Michael addition reaction on trimethylolpropane triacrylate (CH3CH2C(CH2OCOCH2═CH2)3) and alkylidene diamine (NH2CH2(CH2)nNH2), wherein n is an integer from 1 to 5, so as to obtain trimethylolpropane core, amino group terminated dendrimer, and modifying the amino group by methylene phosphonic acid to obtain the trimethylolpropane core, phosphonic acid terminated dendrimer having a chemical formula of CH3CH2C[CH2OCOCH2CH2N(CH2PO3H2)CH2(CH2)nN(CH2PO3H2)2]3, wherein n is an integer from 1 to 5. The trimethylolpropane core, phosphonic acid terminated dendrimer has high calcium tolerance, and excellent inhibiting efficiency of calcium carbonate, calcium sulfate and barium sulfate, which is applied in inhibiting the formation and deposition in industrial water systems of circulating cooling water, oilfield flooding and reverse osmosis, and particularly suitable for water treatment with high calcium tolerance.

The invention discloses a preparation method for low-phytic acid calcium-tolerant soybean protein. The method comprises the following steps of dissolving low-temperature defatted soybean flour into water, and processing low-temperature defatted soybean flour milk for more than 2 h by phytase to obtain soybean flour milk which is preliminarily processed; performing jet cooking on the soybean flour milk, regulating the pH value to be between 7.5 and 8.5, centrifugally separating, regulating the pH value of supernatant fluid to be between 4.0 and 4.5, dissolving precipitation again with water after centrifuging, and regulating the pH value to be between 6.5 and 7.5; filtering obtained protein solution by an ultrafiltration membrane of which the molecular weight cutoff is 80 kDa, performing spray drying or freeze drying on concentrated solution, and thus obtaining the low-phytic acid calcium-tolerant soybean protein powder. A production process of the low-phytic acid calcium-tolerant soybean protein is low in production cost, the content of the phytic acid reaches 0.12 percent, and the calcium tolerance amount of the protein is 1.0 percent of the weight of the protein. The low-phytic acid calcium-tolerant soybean protein served as a substitute of sodium caseinate can be applied to child and adolescent nourishments, calcium supplement food and medical and clinical nourishments.

The invention provides a reverse osmosis phosphorus-free scale inhibitor with a network structure, which is characterized in that: after the polyamino acid-diethylenetriamine copolymer is obtained by the copolymerization reaction of polyamino acid and diethylenetriamine, the polyamino acid-diethylenetriamine copolymer is mixed with citric acid. Continue the reaction to obtain a reverse osmosis phosphorus-free scale inhibitor with a network structure. The reverse osmosis phosphorus-free scale inhibitor can be used in high hardness, high alkalinity and low pH environments, and has excellent scale inhibition performance against calcium carbonate, calcium phosphate and calcium sulfate, and can effectively inhibit the formation of silicon scale, showing good performance. synergy.

The invention relates to a cleaning agent composition, comprising citric acid, hydrochloric acid, trisodium nitrilotriacetate and a dispersing agent. The dispersing agent is selected at least one from an organic phosphonic acid, a poly-aspartic acid, a polyepoxysuccinic acid and a co-polymer and / or a homopolymer obtained by polymerization of at least one of an unsaturated organic acid, an unsaturated organic acid ester and an unsaturated organic acid anhydride, wherein the organic phosphonic acid comprises one or more of hydroxyls, amino groups, carboxyls and sulfonyls. The invention also relates to a method for cleaning a reverse osmosis membrane by using the above cleaning agent composition. The method comprises the steps of preparing the cleaning agent composition into a cleaning liquid with a pH value of 2.5-3.5 and cleaning the reverse osmosis membrane by using the cleaning liquid. The cleaning liquid prepared by the cleaning agent composition can clean the reverse osmosis membrane effectively, makes water yield of a reverse osmosis system restore basically, and can significantly reduce front-and-back pressure difference of the reverse osmosis membrane and reduce conductivity of produced water.

The invention provides a composite water treatment agent which is used for industrial recycling cooling water treatment, has an excellent CaCO3 scale inhibiting function and good corrosion inhibiting ability, and is particularly applicable to high temperature conditions as well as a preparation method of the composite water treatment agent. The composite water treatment agent provided by the invention is mainly prepared from raw materials such as organic polybasic phosphonic acid, hydrolytic polymaleic anhydride or acrylic acid-maleic anhydride, an inorganic salt corrosion inhibitor and an organic salt corrosion inhibitor. Compared with the prior art, the composite water treatment agent provided by the invention is very high in chemical stability and heat stability, and the scale inhibiting effect under the high temperature condition is guaranteed. The product, namely the composite water treatment agent provided by the invention, aiming at an industrial water system which is high in content of scale-forming ions and higher in medium temperature, can effectively prevent generation of calcium carbonate scales, permit higher operating temperature and bear considerably high total salt content and content of scale-forming ions, and is safe in production and implementation processes, and raw materials are easily obtained.

The method of descaling steel-making turbid circulation water includes precipitation and separation of turbid circulation water in sedimentation tank, in which are added sodium carbonate to lower calcium hardness of water, descaling dispersant for descaling and dispersion, and flocculant to lower water turbidity. The present invention has high descaling effect and no damage to production equipment, can decrease calcium ion of water to eliminate scale radically, and has the advantages of low cost, easy cleaning, etc.