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

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.

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 discloses a self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum and a preparation method and application thereof in an oil field, and the preparation method comprises the following steps: 1) mixing paraffin, a compound emulsifier and hexadecanol to prepare an oil phase; adding guanidine gum to obtain a reversed-phase emulsion; 2) adding the reversed-phase emulsion into an acrylamide solution, a sodium 2-acrylamido dodecanesulfonate solution and an N-n-dodecyl acrylamide solution; 3) adding an initiator solution, stirring under the condition of introducing nitrogen, and stopping introducing the nitrogen into the sealing device for reaction; 4) after the reaction is finished, demulsifying with ethanol, performing suction filtration, washing and drying to obtain a crude product; 5) extracting the crude product, and 6) adding a borax cross-linking agent into the grafted guanidine gum solution to prepare the self-emulsifying hydrophobic association type polyacrylamide grafted guanidine gum fracturing fluid. The salt resistance of the guanidine gum fracturing fluid is improved, and the temperature resistance and salt resistance of the copolymer grafted guanidine gum fracturing fluid are improved.

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.

The invention relates to a solid corrosion and scale inhibitor and a processing method thereof, and belongs to the technical field of oil-water well scale prevention. The solid corrosion and scale inhibitor comprises the following components in parts by weight: 30 to 35 parts of imidazoline quaternary ammonium salt, 8 to 10 parts of organic phosphoric acid, 1-3 parts of fungicide, 0.5-1 part of dispersant, and 20-30 parts of water. The processing method comprises the following step of evenly dispersing the imidazoline quaternary ammonium salt, the organic phosphoric acid and the fungicide in the dispersant of the network structure to form a solid block. A long-acting slow-release mechanism is that the dissolution rate of an oil-soluble slow-release regulator with a network structure achieves slow and stable release, so that the imidazoline quaternary ammonium salt and the organic phosphoric acid are uniformly dispersed in an oil-water mixture in a shaft to form the scale inhibitor withcomprehensive effects of slow release, scale inhibition and sterilization, and the user performance is high..

The invention relates to a cleaning agent composition, comprising a non-ionic surfactant and a dispersing agent, wherein the non-ionic surfactant is a fatty alcohol-polyoxyethylene ether; and the dispersing agent is a (methyl)acrylic homopolymer and/or a (methyl)acrylic acid copolymer. 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 10.5-11.5 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 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 provides a super-branched chain reverse osmosis scale inhibitor with a net structure. The super-branched chain reverse osmosis scale inhibitor is characterized by being prepared from substances containing the following components: the mass ratio of an acrylic acid-2-acrylamido-2-methylpropane sulfonic acid copolymer to a mixture of polyamino polyether methylene phosphonate and organic phosphine derivatives to tricarboxylic acid is (2-2.5):1:(0.5-1); the mass of water is 1-1.5 times as much as the sum of masses of the acrylic acid-2-acrylamido-2-methylpropane sulfonic acid copolymer, the mixture of polyamino polyether methylene phosphonate and organic phosphine derivatives and tricarboxylic acid; the mass of a crosslinking agent is 0.5-1% of the mass of the water; and the concentration of an organic acid catalyst in the water is 0.5-1 mol/L. A scale inhibitor is capable of effectively preventing carbonate, sulfate, metal oxide and silicon dioxide from blocking a reverse osmosis membrane and effectively realizing sterilization.

The invention discloses a novel multifunctional scale inhibitor for leachate deep treatment. The novel multifunctional scale inhibitor comprises the following ingredients in percentage by mass: 3 to 15 percent of imidazoline corrosion inhibitors, 5 to 20 percent of acrylic acid- acrylic ester ternary polymers, 10 to 25 percent of alkyl epoxy carboxylate, 3 to 10 percent of polyepoxysuccinic acid, 3 to 15 percent of polyaspartic acid and 30 to 70 percent of water. The novel multifunctional scale inhibitor is invented by specially aiming at the characteristics of high hardness, high alkalinity, high heavy metal pollution concentration of the landfill leachate wastewater; ingredients with certain scale inhibition, dispersion and corrosion inhibition effects are compounded; the synergistic interaction effect is achieved. The novel multifunctional scale inhibitor has the advantages that the price is low; the cost is low; the good effects are achieved on the corrosion inhibition of the metal pipeline in the leachate deep treatment and the scale inhibition of a reverse osmosis membrane.

The invention discloses a coal chemical industry grey water scale inhibitor, and belongs to the technical field of grey water scale inhibitors. The coal chemical industry grey water scale inhibitor comprises the following components by weight: 10-15 parts of water; 20-35 parts of polyamino polyether methylene phosphonic acid; 32-47 parts of an acrylic acid-2-acrylamide-2-methyl propanesulfonic acid copolymer; 17-28 parts of an acrylic acid-acrylate copolymer; 2-8 parts of a compounding agent; 1-3 parts of a stabilizer; and 2-5 parts of a passivation solution. The scale inhibitor of the invention has the advantages of being stable at high temperature, high in scale inhibition rate and good in corrosion inhibition.

The invention discloses a coal gasification grey water dispersing agent and a preparation method thereof, the coal gasification grey water dispersing agent comprises 5%-15% of phosphoric acid tricarboxylic acid butane, 5%-15% of polymaleic anhydride, 5%-15% of acrylic acid-acrylamide sulfonate biopolymer and tap water, and the preparation method comprises the steps of material picking, feeding, standing and filtering. According to the present invention, the high-temperature scale inhibition dispersion effect is excellent, the scale inhibition dispersion rate of more than 80% at the high temperature of more than 200 DEG C is still maintained, the scale inhibition dispersion agent has been applied to a variety of gasification furnaces such as coal water slurry gasification, pulverized coal gasification and the like, can be used for a long enough period, can not be stopped for more than 6 months, and can ensure the continuous and stable operation of the device.

The invention discloses a preparation method of a reverse osmosis scale inhibitor. The reverse osmosis scale inhibitor comprises the following raw materials: 10-15 parts of amino trimethylene phosphonic acid, 10-15 parts of an acrylic acid-acrylate sulfonate biopolymer, 3-5 parts of citric acid, 5-8 parts of propyl methacrylamide, 3-6 parts of sodium hydrogen sulfite and 60-70 parts of tap water. The preparation method comprises the following steps: feeding: sucking tap water into a reaction kettle, keeping the temperature at 30-40 DEG C, and starting stirring; adding amino trimethylene phosphonic acid into the reaction kettle; adding citric acid into the reaction kettle; sucking the acrylic acid-acrylate sulfonate binary copolymer into the reaction kettle; after stirring for 3 to 5 minutes, adding propyl methacrylamide and sodium hydrogen sulfite into the reaction kettle; continuously stirring for 20-40 minutes, and uniformly mixing; standing: after standing for 20-40 minutes, cooling to normal temperature, sampling and checking to ensure that no precipitate is separated out; and filtering: after filtering, sub-packaging to obtain a finished product.