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90 results about "Starch xanthate" patented technology

Method for preparing cationic cross-linked starch xanthate

The invention discloses a method for preparing cationic cross-linked starch xanthate. The method comprises the following steps of: dissolving NaOH and 2,3-epoxypropyltrimethyl ammonium chloride in cold water, and stirring and mixing with starch; reacting for 9 minutes at the temperature of 60 DEG C in a fast microwave reactor; washing products by using an aqueous solution of ethanol, and finally, drying to obtain etherified starch; adding an alkaline solution prepared by water, sodium hydroxide and sodium chloride into etherified starch to be mixed to form slurry; dissolving epoxy chloropropane in the alkaline solution, dripping the mixture into the slurry, and reacting for 2 hours at the temperature of 50 DEG C; regulating the pH value of the solution to be at 7 by using hydrochloric acid; washing by using absolute ethyl alcohol after suction filtration, and drying to obtain the cross-linked etherified starch; dissolving the etherified starch into the water, adding a solution of sodium hydroxide and adding carbon disulfide, stirring to react for 2 hours at the temperature of 50 DEG C, adding a solution of magnesium sulfate, and continuously reacting for 10 minutes; and performing suction filtration, washing by using distilled water, acetone and diethyl ether in sequence, and drying to obtain the cationic cross-linked starch xanthate. When the cationic cross-linked starch xanthate is used for treating heavy metal wastewater, a cationic polymer is not required to be added.
Owner:SHAANXI UNIV OF TECH

Method for treating polyether wastewater

The invention relates to a method for treating polyether wastewater, and the method is mainly used for solving the problem that the polyether wastewater with high COD (Chemical Oxygen Demand) and low BOD(Chemical Oxygen Demand)/COD ratio can not achieve the discharge standard in the prior art. According to the invention, polyether-containing wastewater with BOD/COD less than or equal to 0.1 and COD more than or equal to 1500 milligrams/liter are treated through a regulating pond, a biochemical pond, an active sludge pond and a secondary sedimentation pond and then discharged, so that the COD contained in the discharged wastewater is less than or equal to 250 milligrams/liter, the SS (Suspended Substance) content is less than or equal to 250 milligrams/liter, the NH3-N content is less than or equal to 7 milligrams/liter, and the TP (Total Phosphorus) content is less than or equal to 0.5 milligrams/liter; a flocculating agent is added to the secondary sedimentation pond, and the flocculating agent is selected from at least one of an aluminum salt inorganic flocculating agent, a ferric salt inorganic flocculating agent, starch phosphate, starch xanthate, chitin, a microbe flocculating agent, polyacrylamide, sodium polyacrylate, chitosan, polyaluminium chloride, polyvinylamine or polyethylene sulphonate. The method disclosed by the invention can be used for better solving the problem and can be used for the industrial production of polyether wastewater treatment.
Owner:JIANGSU CHANGHUA POLYURETHANE SCI & TECH

Method for synthesizing high water absorbent polymer by using potato starch xanthate and acrylamide

InactiveCN102775555ANo gelatinization requiredReduce consumptionWater bathsPolymer science
The invention discloses a method for synthesizing a high water absorbent polymer by using potato starch xanthate and acrylamide. The method is mainly characterized by comprising the following steps of: firstly hydrolyzing the acrylamide by using alkaline, and subsequently heating in water bath under the protection of nitrogen, so the starch xanthate and a part of the hydrolyzed acrylamide are subjected to graft polymerization at 35 to 45 DEG C so as to prepare the high water absorbent polymer. The maximum water absorbing capacity of an optimal product in deionized water of 2500 times can be 2160g/g, and the water absorbing capacity in deionized water of 10000 times can be 5000g/g; and meanwhile the high water absorbent polymer prepared by the method is high in nitrogen content. The methodfor preparing the high water absorbent polymer has the following advantages that the parent potato starch xanthate does not need to be gelatinized, the graft polymerization reaction is low in temperature, and high temperature reaction is not needed, so that the method for synthesizing the high water absorbent polymer provided by the invention is simple in process, easy to operate, low in cost andexcellent in product performance, so that the method is more applicable for scale production and popularization of products.
Owner:INNER MONGOLIA UNIVERSITY

Disinfection powder for sewage, and preparation method and application method thereof

The invention provides a sewage disinfector, and a preparation method and application method thereof. The sewage disinfector comprises, by mass, 40 to 60% of potassium monopersulfate, 0 to 5% of calcium peroxide, 4 to 15% of magnesium sulfate, 6 to 12% of iron chloride, 5 to 15% of sodium bicarbonate, 0 to 7% of nanometer titanium dioxide, 0 to 10% of chitosan, 0 to 12% of starch xanthate, 3 to 8% of fatty acid monoglyceride, 4 to 20% of a weak acid component and 1 to 15% of a stabilizing agent. After dissolving of the sewage disinfector provided by the invention, a plurality of high-activity free radicals are continuously produced and exert combined disinfection effect, so the sewage disinfector has the advantages of a wide disinfection spectrum, good disinfection effect, high efficiency and safety; through combined usage of three flocculating agents consisting of iron chloride, chitosan and starch xanthate, the sewage disinfector can remove metal ions, radioactive substances and organic matters in water and effectively decrease CODs and BODs in a water body; and nanometer titanium dioxide can kill a plurality of bacteria and fungi in water in long duration and is free of toxicity and harm. When the sewage disinfector is applied to treatment of sewage, procedures like grating filtering, fermentation, precipitation and flotation are not necessarily needed, so the sewage disinfector is convenient to use.
Owner:江苏苏沃尚新材料科技有限公司

Boiler waste water treatment agent based on graphene modified polyaspartic acid and preparation method

The invention discloses a boiler waste water treatment agent based on graphene modified polyaspartic acid and a preparation method. A composition of the agent is prepared from, by weight, 20-30 parts of polyaspartic acid, 2-3 parts of sodium gluconate, 2-3 parts of citric acid, 40-50 parts of poly-ammonium salt lignin flocculating agents, 20-30 parts of sodium bentonite, 8-10 parts of graphene, 4-6 parts of salicylic acid, 2-4 parts of alkaline trehalose, 20-30 parts of sepiolite powder, 10-14 parts of crosslinked rectorite powder, 3-5 parts of starch xanthate, 2-4 parts of amino tri-methylene phosphonic acid, 1-3 parts of polymerized potassium silicate sulfate, 1-3 parts of dimethyl diallyl ammonium chloride, an appropraite amount of deionized water and an appropriate amount of water. According to the boiler waste water treatment agent and the preparation method, graphene is adopted for modifying polyaspartic acid and improving dispersity of the polyaspartic acid for CaCO<3>, Ca<3>(PO<4>)<2>, dispersed ferric oxide, stable Zn<2+> salt and the like; meanwhile, efficient adsorption is achieved by adding the sodium bentonite, the sepiolite powder and the crosslinked rectorite powder, the boiler waste water treatment agent is low in cost and simple in preparation process, hollow porous particles are obtained, recovery is facilitated, and adsorption efficiency is improved.
Owner:安徽精高水处理有限公司

Preparation method of municipal sewage treating agent

The invention provides a preparation method of a municipal sewage treating agent.The method comprises the steps of firstly, picking dry straw, pulverizing the straw, adding a solution of sodium cyanoborohydride, ammonium ceric nitrate and gelatin, mixing the materials to be uniform, raising the temperature, then adding poly(ethyl acrylate), polyacrylonitrile and glutaraldehyde, raising the temperature, lowering the temperature, and conducting filtering, so that solid matter is obtained; then adding etidronic acid and polyhydric alcohol phosphate ester to water, conducting stirring, adding isothiazolinone, sepiolite, starch xanthate, magnesium sulfate heptahydrate, chitosan, N, N-dimethyl methylene diphosphonic acid, lecithin and lignin, and mixing the materials to be uniform, so that a mixture (I) is obtained; finally, adding a sodium hydroxide solution to the mixture (I) to adjust pH to 6.0-7.0, adding organic acid and the obtained solid matter, mixing the materials to be uniform, and then leaving the mixture standing still, so that the municipal sewage treating agent is obtained.By means of the municipal sewage treating agent, the chemical oxygen demand of sewage can be lowered to 63 mg/L, the biochemical oxygen demand can be lowered to 28 mg/L, suspended solids can be decreased to 35 mg/L, and total phosphorus can be decreased to 0.37 mg/L.
Owner:刘平
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