473 results about "Sodium hydrogen sulphite" patented technology

The invention discloses compound amino acid injecta, which contains arginine hydrochloride, histidine monohydrochloride, leucine, isoleucine, lysine hydrochloride and the like; meanwhile, the invention further discloses a preparation method of the compound amino acid injecta (18AA); in the event of ensuring the product quality, the compound amino acid injecta has the characteristics of saving energy and enhancing efficacy; by means of repetitive verification on precision, detection limit, quantitation limit, linear range and the like, a simple, convenient, rapid and reliable method with cleaning verification is ensured; furthermore, the residual quantity of antioxygen, namely sodium hydrogensulfite, in the compound amino acid injecta and sulphate ion generated by degrading sodium hydrogensulfite are detected according to an ion chromatography principle, thus, the amount of the antioxygen charged in the raw material proportioning can be accurately measured, and the stability of the raw material proportioning process is judged according to the measurement result; and a detection method of the compound amino acid injecta provided by the invention is an online derivative amino acid content measuring method, the speed is rapid, and the method is applied to large-scale detection.

The invention provides a method for preparing a water-coal-slurry additive taking enzymatic hydrolysis lignin as a raw material. In the method, the chemical activity of the enzymatic hydrolysis lignin is utilized to directly perform polycondensation with sodium hydrogen sulfite, sodium metabisulfite, acetone and methanal to a prepare enzymatic hydrolysis lignin-sulphonated acetone-methanal condensation polymer (LSAF); the enzymatic hydrolysis lignin-sulphonated acetone-methanal condensation polymer (LSAF) is compatible with other types of surfactants, and is compounded with the surfactants, such as sodium dodecyl benzene sulfonate, PVA, carboxymethyl cellulose sodium and the like to prepare the water coat slurry which has higher stability and lower viscosity; and the liquidity of the water coat slurry is improved. The enzymatic hydrolysis lignin replaces the partial petrochemical raw materials to prepare modified high molecular materials, which not only lowers the cost of high molecular materials, but also can save the consumption of the petrochemical materials, and can generate significant social benefit; and the processing technique for preparing the water-coal-slurry additive taking the enzymatic hydrolysis lignin as a raw material is simple, is easy to implement and has good effect.

The invention provides a multiple-effect super absorbent resin fertilizer. In the manufacturing process, sodium hydrogen sulfite and ammonium persulfate oxidation-reduction type initiator are used as foundations, and ultraviolet initiation is used as an auxiliary means; N-N'-methylene bisacrylamide is used as a crosslinking foundation, and ethylene glycol diglycidyl ether and glycerol are used as auxiliary means; hydroxyethyl acrylate is added in the polymerized monomer, so that the colloid strength of the high molecular polymer is obviously improved; antioxidant, ultraviolet absorbent and light stabilizer are creatively introduced, thus finally manufacturing super absorbent resin having oxidation resistance, light resistance and degradation resistance; the super absorbent resin is organically combined with humic acid, microbial inoculant and an inorganic fertilizer to perform synergistic action, so that the various effective elements achieve the optimal use effect. Meanwhile, the consumption of the inorganic fertilizer is reduced, the salt content of soil is reduced, the pH value of the soil is improved, the soil environment is improved, and soil hardening is prevented, thus greatly increasing the utilization ratio of nitrogen fertilizers, phosphate fertilizers and potassium fertilizers, and achieving comprehensive effects of water saving, fertilizer saving, yield increase and outcome increase.

The invention discloses a depth treatment method and system of wastewater in an industrial park, belonging to the field of sewage treatment. The method comprises the following steps of: carrying out ozone-ultraviolet catalytic oxidation treatment on the treated wastewater in the industrial park after precipitation, and oxidizing cyclic organic matters, partial toxic substances and non-degradable substances contained in the discharged water by ozone and ultraviolet ray; adding sodium hydrogen sulfite into the discharged water subjected to ozone-ultraviolet catalytic oxidation treatment, and reducing active oxygen in the oxidized wastewater by the sodium hydrogen sulfite; enabling the reduced discharged water to enter a biological aerated filter for being subjected to aeration and biological filtering treatment, and removing organic matters and ammonia nitrogen; and filtering the discharged water of the biological aerated filter, and after filtering, using the discharged water without the suspended matters as standard water for reuse. The method disclosed by the invention has the characteristics of high impact load resistance, strong treatment capability, short process flow, small occupied area of the system, and good treatment effect.

The invention discloses an inverse emulsion drag reduction agent for fracturing a shale gas by using quick water and a preparation method thereof, and relates to the technical field of petroleum engineering. The inverse emulsion drag reduction agent is a macromolecular water soluble polymer which is prepared from acrylamide, sodium acrylate and dodecyl methacrylate copolymerized in an inverse emulsion, and azo diisobutyl hydrochloride and sodium hydrogen sulfite as complex initiation systems. A long-chain hydrophobic monomer is introduced into the drag reduction agent, so that the shear resistance of the drag reduction agent in a high displacement pump injection process is improved, meanwhile, the drag reduction agent is prepared from the inverse emulsion in a polymerization manner, the product is a liquor and instant, the liquor demands of a continuous mixed construction technology for fracturing the shale gas are met, the dosage for field use is 0.06-0.8% of mass of clean water, and the drag reduction rate can be up to 73%.

The invention discloses real leather suede leather stereoscopic printing paste and a preparation method. The real leather suede leather stereoscopic printing paste is prepared by preparing polyurethane resin of sodium hydrogensulfite blocked isocyanate by polypropylene glycol, polyethylene glycol, chain extenders, trimethylolpropane, polyisocyanate, solvents, catalysts, methyl ethyl Ketoxime, sodium hydrogensulfite, ice and water, and blending the polyurethane resin with a polyurethane filming fixing agent FS-0517. According to the real leather suede leather stereoscopic printing paste and the preparation method, stereoscopic printing for real leather suede leathers can be achieved by utilizing the flat screen printing technology and drying real leather suede leathers at a temperature between 60 DEG C and 90 DEG C, a concave and convex feel is apparent, the style is elegant and fashionable, stereoscopic print patterns are specific, and the print patterns are stable, and water washing and dry friction resistant.

The invention discloses a preparation method of 1,3-propane sulfone. The preparation method comprises the following steps: firstly, using propenol and sodium hydrogen sulfite as raw materials, taking deionized water as a medium, and reacting under catalytic addition reaction of an initiator to generate 3-sodium hydroxy propanesulfate; secondly, adding sulfuric acid into a reaction solution for acidating, then removing excessive water by distilling, subsequently adding anhydrous ethanol, and extracting and filtering to obtain an ethanol solution of 3-hydroxy propanesulfate; thirdly, distilling the ethanol solution of the 3-hydroxy propanesulfate at normal pressure first to remove ethanol, and then rectifying to obtain the 1,3-propane sulfone; fourthly, adding an aqueous solution of sodium hydroxide into cauldron bottom residue to carry out hydrolysis, then adding sulfuric acid for acidating, subsequently adding anhydrous ethanol, extracting and filtering to obtain an ethanol solution of 3-hydroxy propanesulfonic acid, then distilling the ethanol solution of the 3-hydroxy propanesulfonic acid at normal pressure to remove ethanol, and then rectifying to obtain the 1,3-propane sulfone. According to the preparation method, the reaction temperature is reduced; in addition, a product is high in mole yield and few in solid wastes; the high-purity product is easily obtained.

The invention relates to agents for the reductive decolorization of dyed keratin fibers, in particular human hair, containing in an aqueous cosmetic carrier (a) one or more reduction agents from the group consisting of sodium dithionite, zinc dithionite, potassium dithionite, sodium sulfite, sodium hydrogen sulfite, potassium sulfite, potassium hydrogen sulfite, ammonium sulfite, sodium thiosulfate, potassium thiosulfate, ammonium thiosulfate, hydroxymethanesulfinic acid, aminomethanesulfinic acid, cysteine, thiolactic acid, sulfanylacetic acid (thioglycolic acid), and/or ascorbic acid, and (b) one or more zwitterionic surfactants, each of which has at least one quaternary ammonium group and a grouping of —SO₃— as structural units.

The invention discloses a preparation method of P-chlorophenylhydrazine hydrochloride. The method comprises the following steps: diazotizing chloroaniline taken as a raw material so as to prepare a corresponding diazonium salt; mixing anhydrous sodium sulfite with sodium hydrogen sulfite in a stirring manner, maintaining a pH (Power Of Hydrogen) value within 6 to 7, controlling a temperature below 40 DEG C, slowly adding the diazonium salt below a liquid surface and reacting at the temperature of 60 DEG C to 90 DEG C according to the molar ratio of the p-chloroaniline to the sodium hydrogen sulfite being 1:(1-1):3; maintaining the unchanged pH value in the step 2, slowly adding hydrochloric acid so as to maintain the pH value within 1 to 3, reacting for 1 to 3 hours at the reaction temperature of 40 DEG C to 90 DEG C, cooling to a room temperature, filtering and drying so as to obtain a reddish P-chlorophenylhydrazine hydrochloride solid. The pH value of the reaction system is maintained within 6 to 7 by taking a mixture of the sodium sulfite and the sodium hydrogen sulfite as a reducing agent, so that the phenomenon that the pH value is always regulated by NAOH (sodium hydroxide) or HCL (hydrogen chloride) in a reaction process is avoided; and the repeated heating during the reaction process is not required, so that the temperature is convenient to control; and the adding amount of water is reduced, so that the discharge of wastewater is greatly reduced, namely, the wastewater treatment at a later period is avoided. As a result, the cost is lowered.

The invention discloses a method for preparing 2-taurine. The method comprises the following steps: reacting ethylene oxide with sodium hydrogen sulfite at 0.05-0.1MPa, pH value of 6.5-7.5 and temperature of 75-85 DEG C to prepare sodium hydroxyethyl sulfonate; performing ammonolysis reaction on the sodium hydroxyethyl sulfonate and liquid ammonia at 14-24 MPa and 160-280 DEG C to obtain an ammonolysis solution containing 2-taurine sodium, evaporating the ammonolysis solution to remove ammonia, neutralizing by using sulfuric acid, concentrating, crystallizing and separating, pre-drying in a boiling drying device or a vibration fluidized drying device, and then adding the dried product in a microwave drying device to dry and sterilize to obtain the 2-taurine, wherein the water content of the dry 2-taurine is reduced to be less than 0.05% in combination of the pre-drying of the boiling drying device or the vibration fluidized drying device and the far infrared of the microwave drying, and further the effect of sterilizing is achieved. The method disclosed by the invention is short in preparation time of the 2-taurine, high in yield, low in cost and easy for industrial production.

The invention provides an amide polymer shale inhibitor for drilling fluid. The amide polymer shale inhibitor is characterized by being prepared from, by mass, 10%-20% of acrylamide, 5%-10% of 300# liquid wax, 10%-20% of hexadecyl dimethyl benzyl ammonium chloride, 2%-8% of dimethyl diallyl ammonium chloride, 20%-30% of methacryloyloxyethyl trimethyl ammonium chloride, 15%-25% of acrylic acid, 2%-5% of emulsifiers, 0.03%-0.6% of an initiator and 20%-40% of water, wherein the emulsifiers are any two of Span60, Tween80, Span80, Tween60 and hexadecyl trimethyl ammonium bromide, and the initiator is any one of ammonium persulfate-ethanol, ammonium persulfate-pentaerythritol, ammonium persulfate-sodium hydrogen sulfite and ammonium persulfate-sodium sulfite. By means of a synergistic effect of chemical inhibiting and enveloping and blocking of hydrophobic groups, the good inhibition effects can be achieved, integral inhibition is achieved, and the problem that an original shale inhibitor is bad in inhibition effect under the complex condition is solved.

The invention relates to a method for synthesizing 5-bromoindole. The method comprises the following steps of: (1) dissolving indole into alcoholic organic solvents, adding an aqueous solution of sodium hydrogensulfite or potassium hydrogensulfite, reacting for 15 to 20h, filtering a reaction solution, washing, and drying to obtain an intermediate I; (2) mixing the intermediate I and acetic anhydride, raising the temperature to 68 to 75 DEG C, reacting for 2 to 3h, adding ester or benzene organic solvents, reacting for 0.5 to 1h, cooling to room temperature after the reaction is finished, filtering, washing, and drying to obtain an intermediate II; and (3) dissolving the intermediate II into water, adding bromine at the temperature of between 0 and 5 DEG C, keeping the reaction for 1 to 3h, raising to room temperature, continuing to react for 1 to 2h, adding the aqueous solution of sodium hydrogensulfite or potassium hydrogensulfite, reacting for 10 to 30min, adding an aqueous solution of sodium hydroxide or potassium hydroxide, refluxing for 12 to 18h, cooling a reaction solution, precipitating crystals, filtering, washing, and drying to obtain a product, namely the 5-bromoindole. The method is low in cost consumption and is simple, and the quality of the product is high.

The invention discloses a device and method for removing sulfur dioxide in smoke by the two-step alkalifying reproducing and sodium sulfite method, and aims at overcoming the shortages of an existing sodium-sulfite-method desulfurization technology. The method is characterized in that a reproducing unit performs reproduction in two steps; an absorbing unit is used for absorbing sulfur dioxide from the smoke twice with absorbing solutions composed of different components, wherein in the first reproduction step, most of sodium hydrogen sulfite is removed to obtain a sodium sulfite crystal, and in the second reproduction step, all sodium hydrogen sulfite is removed to obtain a pure sodium sulfite solution with high absorbing capacity; the mixing solution of sodium sulfite and sodium hydrogen sulfite is used to absorb in a main absorbing stage; in a fine absorbing stage, the pure solution, with high absorbing capability, which is obtained by reproducing is used to continuously desulfurize the smoke desulfurized in the main absorbing stage so that the content of sulfur dioxide in the clean smoke is reduced to be less than 40mg/m<3>. According to the device and method, the balance among the investment, desulfurization degree, operation economy and reliability is ensured, so that compared with a calcium-method desulfurization technology and a ammonia-method desulfurization technology, the method according to the invention has the advantage that the lower cost and higher desulfurization degree can be realized; the device and the method can be widely applied to thermal power plants, metallurgy, building materials and industrial furnaces.

The invention discloses a Reduning injection and a preparation method thereof. The Reduning injection comprises herba artemisiae annuae, honeysuckle, fructus gardenia, HS-15, sodium hydrogen sulfite and injection water. When a traditional Chinese medicine composition is prepared, the different components are subjected to distillation, decoction and ethanol extraction so as to take effects of effective ingredients. The preparation method of the Reduning injection comprises the steps of firstly preparing honeysuckle, herba artemisiae annuae dry paste powder and fructus gardenia dry paste powder, and adding HS-15, sodium hydrogen sulfite and injection water according to the procedure of the preparation so as to prepare the Reduning injection. Compared with commercially available Reduning injections, the Reduning injection has the prominent advantages that by utilizing new prescription and process, the prepared product meets pharmacopeia standards, and untoward effects caused by the Reduning injection are obviously reduced.

The invention discloses a preparation method and an application of hydrophobization beta-cyclodextrin cation polyelectrolyte. In a water phase, three monomers, namely polymerizable beta-cyclodextrin derivatives, acryloyl oxyethyl trimethyl ammonium chloride and styrene, are subjected to a free radical copolymerization reaction under an oxidation/reduction (potassium peroxodisulfate/sodium hydrogen sulphite) initiating system to obtain the hydrophobization beta-cyclodextrin cation polyelectrolyte product. The hydrophobization beta-cyclodextrin cation polyelectrolyte product is white powder solids and is stable in structure and convenient to store and transport, hydrophilcity is reduced and better solubility is still maintained; the preparation method of the hydrophobization beta-cyclodextrin cation polyelectrolyte product is simple, and low in energy consumption; no other auxiliaries such as a surface active agent is added in an aqueous solution polymerization process, and environmental pollution is less; and the hydrophobization beta-cyclodextrin cation polyelectrolyte product can serve as a novel flocculating agent for decoloration, the specific structure of beta-cyclodextrin (beta-CD) is reserved, toxicity and cost are low, flocculation capacity is strong, decoloration speed is high, an applicable pH range is wider (2-12), and salt tolerance is high.

The invention relates to an animal protein-based cement foaming agent. The animal protein-based cement foaming agent is prepared by the following steps: adding water, ox hair and the sodium hydrogen sulfite, pre-processing in a thermostatic water bath for 1-2h at the temperature of 80-95 DEG C, performing suction filtration, getting the solid, adding water and alkali, hydrolyzing for 5-7h at the temperature of 80-95 DEG C, performing suction filtration and centrifugation to obtain a hydrolysate; adding a proper amount of C to keep the pH neutral to obtain the animal protein-based cement foaming agent base solution; adding proper different varieties in the base solution, such as a foam stabilizing component and a strengthening component, and mixing uniformly to obtain the animal protein-based cement foaming agent. The obtained foaming agent is strong in foaming ability, fine and uniform in foam, high in stability, low in price and available in the raw materials, widens the tanning solid waste resource utilization approach and can well solve the solid waste recycling problem in the tanning industry if the foaming agent is widely popularized.

The invention discloses a high-efficiency decompression and augmented injection agent used for oil extraction. The high-efficiency decompression and augmented injection agent is characterized by comprising the following components in parts by weight: 1.0-2.0 parts of epoxy chloropropane, 1.0-2.5 parts of dimethylamine, 1.0-4.0 parts of trimethylamine, 0.01-0.1 part of ammonium persulphate, 0.015-0.15 part of sodium hydrogen sulphite, 0.01-0.2 part of ethanediamine and 0.02-0.06 part of triethylene tetramine. The invention also discloses a production method of the high-efficiency decompression and augmented injection agent. The production method is characterized by comprising the following steps of: adding epoxy chloropropane into a porcelain enamel reaction kettle; slowly feeding a mixed solution of dimethylamine and trimethylamine, prepared at room temperature in proportion; after feeding is completed, adding the ammonium persulphate, then adding the sodium hydrogen sulphite, and maintaining temperature in the kettle to be not higher than 5 DEG C; after feeding is completed, heating until the temperature in the kettle is increased to 60-90 DEG C, and reacting for 7-9 hours, so that an intermediate product is obtained; cooling the intermediate product to 40 DEG C, and slowly adding a mixed solution of ethanediamine and triethylene tetramine; and reacting again at the temperature of 40 DEG C, so that the high-efficiency decompression and augmented injection agent finished product is obtained.

The invention relates to a preparation method of a silane coupling agent modification montmorillonite functionality nanometer fat liquoring complex agent. Leather flame-retardant technology and flame-resistant materials are rarely studied and developed in China, and studies of obtaining a functionality nanometer fat liquoring complex agent by using silane coupling agent modification montmorillonite and introducing the silane coupling agent modification montmorillonite to preparation of a fatting agent are rare. The preparation method includes fetching methanol and water, adding asilane coupling agents and Na-montmorillonite to the methanol and the water so as to obtain the silane coupling agent modification montmorillonite, enabling the silane coupling agent modification montmorillonite to thermostatically react with colza oil, and adding quadrol Al2O3, dropping a solution of acrylic acid and sodium hydrogen sulfite to obtain the silane coupling agent modification montmorillonite functionality nanometer fat liquoring complex agent. The silane coupling agent modification montmorillonite functionality nanometer fat liquoring complex agent is excellent in flame resistant property, improves mechanical properties, filling ability, binding ability and the like of a product, and has the advantages of being reproducible in sources, non-toxic and pollution-free, good in biological degradability and the like.

The invention discloses a method for preparing a hydrophilic polyvinylidene fluoride hollow fiber membrane, which comprises the following steps: (1) sequentially adding polyvinylidene fluoride resin with concentration of 12 to 30 weight percent, a pore-forming agent with concentration of 2 to 10 weight percent, organic alkali with concentration of 2 to 30 weight percent and a solvent with concentration of 50 to 80 weight percent into a reaction kettle, stirring to perform reaction to obtain film casting liquid and extruding the film casting liquid by a hollow fiber spinning machine to prepare a hollow fiber membrane; 2, soaking the prepared hollow fiber membrane into 3 weight percent of potassium permanganate solution; and 3, soaking the hollow fiber membrane processed by the potassium permanganate solution into 5 weight percent of sodium hydrogen sulfite solution to obtain the hydrophilic polyvinylidene fluoride hollow fiber membrane. The preparation method disclosed by the invention adopts a manner of adding the organic alkali into the film casting liquid to perform hydrophilic modification on a polyvinylidene fluoride film; the preparation method is simple to operate; and reaction conditions in each step are easy to control.

The invention relates to acrylic acid(AA)/sodium 2-acrylamide-2-methylpro panesulfonic acid(AMPS-Na)/diisocyanate-modified allyl cyclodextrin (MACD) copolymer. The copolymer can effectively adsorb organic molecules in wastewater and has higher fluid loss effect. The technical scheme is that: the copolymer is prepared by polymerizing three monomers, namely acrylic acid (AA), sodium 2-acrylamide-2-methylpro panesulfonic acid (AMPS-Na) and diisocyanate-modified allyl cyclodextrin (MACD); and the copolymer comprises 0.7 molar percent of AA, 15 to 50 molar percent of AMPS-Na and 49.3 to 84.3 molarpercent of MACD. A preparation method comprises the following steps of: adding an aqueous solution of AA, a solution of AMPS-Na and a solution of MACD; adding disodium ethylene diamine tetraacetate, potassium peroxydisulfate and sodium hydrogensulfite; and uniformly stirring and mixing, and reacting at the temperature of between 30 and 70DEG C for 5 to 8 hours under the protection of nitrogen to obtain the AA/AMPS-Na/MACD copolymer. The copolymer has good decontamination effect when treating the organic molecules in the wastewater, has good fluid loss effect in drilling fluid and can resist temperature higher than 250DEG C.

The invention discloses a special formulated fertilizer for pear trees. The special formulated fertilizer is prepared from the following raw materials in parts by weight: 50-55 parts of cotton straw scraps, 20-23 parts of wheat bran, 20-23 parts of Chinese medicine residue, 12-14 parts of corn flour, 1-2 parts of tea leaf powder, 30-35 parts of urea, 12-15 parts of calcium-magnesium-phosphate fertilizer, 20-24 parts of potassium chloride, 2-3 parts of borax, 2-3 parts of ethyl cellulose, 1-2 parts of boric acid, 1-2 parts of stannous chloride, 3-4 parts of sodium hydrogen sulfite, 3-4 parts of EM fungicide, 4-6 parts of coating agent and a proper amount of water. The special fertilizer for fruit trees disclosed by the invention is mainly prepared from cotton straw scraps, wheat bran, Chinese medicine residue, corn flour and other domestic waste in a fermentation manner and then is combined with inorganic fertilizer, thereby not only saving resource and solving environmental pollution and other problems; the prepared fertilizer is rich in organic matters, thus enhancing fertility of soil and promoting growth and development of pear trees; and the special fertilizer also improves soil structure and increases utilization rate of pear trees to the fertilizer. The prepared fertilizer has excellent economic and environmental benefits.

The present invention discloses an antiemetic ayasetron hydrochloride glucose injection preparation, its preparation method and quality control technique. Its composition includes ayasetron hydrochloride 0.1g, glucose 40-50g and sodium hydrogen sulfite 0-20mg. All the above-mentioned components are added into injection water, and dissolved to 1000ml so as to obtain the invented product. Said preparation is a fluid infusion type preparation, and can be used for clinical application.

The invention relates to a polymer nano ZnO compound antibacterial agent for synthetic leathers based on an in-situ polymerization process and a preparation method of the polymer nano ZnO compound antibacterial agent. Studies relative to an antibacterial agent for synthetic leather base cloths have been rarely reported at present. The preparation method comprises the following steps: mixing zinc acetate and ethanol in water bath, and adding diethanolamine and diallyldimethylammonium chloride to prepare a nano ZnO sol; uniformly mixing allyl glycidyl ether, methacrylic acid and the nano ZnO sol to prepare a nano ZnO sol mixed solution; and mixing diallyldimethylammonium chloride, an ammonium persulfate aqueous solution and a sodium hydrogen sulfite aqueous solution in the water bath for bottoming, dropwise adding the ammonium persulfate aqueous solution and the nano ZnO sol mixed solution, performing stirring reaction, and performing heat preservation and cooling to obtain the antibacterial agent for superfine fiber synthetic leather base cloths. According to the compound antibacterial agent disclosed by the invention, the antibacterial properties of the synthetic leather base cloths can be well improved by virtue of the synergistic effects of N<+> and nano ZnO; and the compound antibacterial agent can be applied to the superfine fiber synthetic leather base cloths, and ensures that the antibacterial rate on escherichia coli and staphylococcus aureus can reach more than 99%.

The invention discloses a preparation method of high-purity 5-acetylacetylaminobenzimidazolone. According to the technical essentials, the preparation method comprises the following steps: under an acidic condition, adding 5-aminobenzimidazolone, sodium hydrogen sulfite, activated carbon and water and reacting at 65 to 70 DEG C; performing suction filtration to obtain intermediate filtrate; addingdiketene and sodium hydroxide into the filtrate and reacting at 60 to 65 DEG C to obtain the 5-acetylacetylaminobenzimidazolone. The purity of a product obtained by the preparation method is greaterthan 99.5 percent and the yield is greater than 87 percent. The preparation method disclosed by the invention has the advantages of simple and easy-to-control technology, safety in operation, small influences on environment and low production cost.