262 results about "Sodium bisulfate" patented technology

The invention relates to the technical field of oilfield chemistry, and discloses a graft modified cellulose filtrate reducer and a preparation method thereof.The preparation method comprises the following steps that modified hydroxyethyl cellulose, 2-acrylamide-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, alkenylated cardanol and N, N '-methylene bisacrylamide are added into deionized water, stirring is conducted, and a mixture is obtained; the preparation method comprises the following steps: adding cellulose into a reaction kettle, stirring for 10-15 minutes at the temperature of 40-60 DEG C at the speed of 300-400 rpm, dropwise adding ammonium persulfate and sodium hydrogen sulfite into a system, and continuously reacting for 4-6 hours to obtain the grafted modified cellulose filtrate reducer. The filtrate reducer disclosed by the invention has good high temperature resistance and salt resistance.

The invention discloses a preparation method of an ester polycarboxylic acid water reducer, and belongs to the technical field of concrete admixtures. The preparation method of the ester polycarboxylic acid water reducing agent comprises the following steps: under an alkaline condition, carrying out free radical polymerization reaction on a polyether macromonomer and an unsaturated carboxylic acid monomer under the action of a chain transfer agent A, a chain transfer agent B and an initiator, continuously adding a catalyst, and carrying out dehydration esterification reaction under the action of the catalyst, so as to prepare the ester polycarboxylic acid water reducing agent, the polyether macromonomer is monohydroxy polyether of which the molecular weight is between 500 and 5000; the chain transfer agent A is one of acetone, isopropanol, sodium hydrogen sulfite, sodium hypophosphite, sodium formate and the like; the chain transfer agent B is one of mercaptoethanol, mercaptopropanol, mercaptoacetic acid, mercaptopropionic acid and the like; the catalyst is a phosphonic acid compound with hydroxyl or amino. The preparation method is simple in process and low in energy consumption, and the prepared ester polycarboxylic acid water reducer product is excellent in performance.

An animal litter, process for preparing the animal litter, and a method for removal of animal waste using the animal litter are provided. The animal litter generally includes at least one sorbent and a sulfate such as sodium bisulfate. The animal litter is in the form of discrete plural particles which tend to agglomerate when wetted.

An animal litter, process for preparing the animal litter, and a method for removal of animal waste using the animal litter are provided. The animal litter generally includes at least one sorbent and a sulfate such as sodium bisulfate. The animal litter is in the form of discrete plural particles which tend to agglomerate when wetted.

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

An animal litter, process for preparing the animal litter, and a method for removal of animal waste using the animal litter are provided. The animal litter generally includes at least one sorbent and a sulfate such as sodium bisulfate. The animal litter is in the form of discrete plural particles which tend to agglomerate when wetted.

The invention discloses a preparation method of sodium polyacrylate, which belongs to the technical field of food processing, and comprises the following steps: weighing a certain amount of acrylic acid, diluting with deionized water, adding into a multi-neck flask, preparing a NaOH solution with a certain concentration, stirring, adding into the flask until a neutralization reaction is completed to obtain a sodium acrylate solution, and adding the sodium acrylate solution into a reaction kettle for reaction; taking a certain amount of activated carbon for adsorption treatment, carrying out suction filtration to obtain a sodium acrylate refined solution, and repeatedly vacuumizing for multiple times; according to the method, on the basis of a redox initiator (ammonium persulfate-sodium hydrogen sulfite), a high-efficiency chain extender dimethylaminopropionitrile is added to form a composite initiation system, and the influence of the addition amount of the composite initiator, the monomer concentration, the reaction time and the reaction temperature on the viscosity of the prepared sodium polyacrylate is discussed respectively. Then, optimal preparation process conditions are determined through an orthogonal test, and the performance of the prepared sodium polyacrylate is measured, so that the practical application effect of the whole method is greatly improved.

The preparation method comprises the following steps: adding a sodium hydrogen sulfite aqueous solution and a catalyst into a reaction container, heating, dropwise adding resorcinol diglycidyl ether after the temperature reaches a set value, titrating with an iodine standard solution until the content of sodium hydrogen sulfite is basically unchanged, and ending the reaction. And carrying out reduced pressure suction filtration on the reaction solution to obtain a product, washing the product with ethyl acetate and ethanol, removing resorcinol diglycidyl ether, drying to obtain a crude product, dissolving the crude product in a hydrochloric acid solution, heating in a constant temperature water bath, evaporating SO2, continuously adding a NaOH alcoholic solution, adjusting the pH to alkalescence, filtering to obtain a solid, and drying to obtain the resorcinol diglycidyl ether. According to the invention, sodium hydrogen sulfite and epoxy are subjected to ring-opening reaction to generate the novel hydrophilic chain extender with hydroxyl and sulfonic acid functional groups. Compared with a traditional production mode, the method is simple in reaction condition, rapid in reaction and high in conversion rate, and has a great prospect in hydrophilic chain extension application.

The invention discloses a synthesis method of methyl 4-formylbutyrate, and belongs to the technical field of chemical synthesis, methyl acrylate and nitromethane are subjected to a Michael addition reaction under the action of a catalyst to prepare methyl 4-nitrobutyrate, and the excessive undissolved catalyst can be recycled after being filtered; the method comprises the following steps: under the action of sodium tert-butoxide and potassium permanganate, carrying out hydrolytic oxidation reaction on methyl 4-nitrobutyrate, adding a sodium hydrogen sulfite aqueous solution and a sulfuric acid solution after the reaction is completed, consuming excessive potassium permanganate oxidant, reducing by-products, and carrying out purification treatment to obtain high-purity methyl 4-formyl butyrate. The synthesis method provided by the invention has the advantages of cheap and easily available raw materials, simple operation, easily controllable conditions, high total yield and easy realization of industrial production.

The application provides a weathering steel surface rust layer stabilizing treatment agent for industrial atmospheric environment, and the chemical composition of the weathering steel surface rust layer stabilizing treatment agent is as follows in terms of mass fraction: 25-45% of acrylic resin, 2.0-6.0% of chromium sulfate, 3.0-8.0% of ferrous oxide, 2.0-6.0% of ferric oxide, 0.5-3.5% of copper sulfate, 0.3-1.5% of sodium bisulfite, 1.0-6.0% of sodium molybdate, 0.5-3.5% of nickel sulfate, 2.0-5.0% of potassium phosphate, 0.05-0.5% of surfactant, 0.05-0.5% of defoaming agent, 0.05-0.5% of dispersing agent, 0.05-0.5% of thickening agent, and the balance is water, wherein the amount of plasticizer added is 2-5% of the resin. The stabilizing treatment agent in the application can promote the weathering steel surface to form a stable and dense rust layer within 0.5-1 year after the surface of the weathering steel is treated before use.

The invention belongs to the technical field of synthetic ester, and particularly relates to a preparation method of fatty acid pentaerythritol ester base oil, which comprises the following steps: carrying out esterification reaction on pentaerythritol and fatty acid in the presence of a catalyst and a color retention agent, and carrying out post-treatment to obtain the fatty acid pentaerythritol ester base oil, the catalyst comprises at least one of stannous octoate, stannous oxalate, stannous oxide, tetrabutyl titanate, isopropyl titanate and sodium hydrogen sulfate; the color retention agent comprises at least one of sodium hypophosphite, hypophosphorous acid, activated carbon and sodium sulfite. The color retention agent sodium hypophosphite is matched with the specific catalyst such as stannous oxalate, so that the petroleum color number of the produced fatty acid pentaerythritol ester base oil is smaller, and meanwhile, the esterification reaction time is shorter.

The invention belongs to the technical field of scale inhibitors, and particularly relates to a slow-release scale inhibitor and a preparation method thereof.The preparation method comprises the steps that 3, 4, 5-allyl trihydroxybenzoate, itaconic acid, sodium hydrogen sulfite, methacryloyloxyethyl-n-hexadecyl-dimethyl ammonium bromide and deionized water are mixed, after water bath heating, an ammonium persulfate aqueous solution is slowly added, and the scale inhibitor is obtained after reaction; the preparation method comprises the following steps: dissolving agar in deionized water, adding polyethylene glycol modified sodium alginate and a scale inhibitor into the deionized water, stirring, dropwise adding into edible oil to obtain gel microspheres, adding the gel microspheres into a calcium chloride aqueous solution, slowly stirring, cross-linking, cleaning and drying to obtain the slow-release scale inhibitor. The hydrogel microspheres swell to slowly release the scale inhibitor, meanwhile, the released scale inhibitor is hydrolyzed in water, ester groups are slowly broken, polycarboxylic acid, 3, 4, 5-trihydroxybenzoic acid and hydroxyethyl-n-hexadecyl-dimethyl ammonium bromide are slowly released, and good scale inhibition and corrosion inhibition effects are achieved.

The invention discloses low-loss superfine soft magnetic alloy powder and a manufacturing method and application thereof, belongs to the technical field of soft magnetic materials, and particularly relates to a method for preparing superfine alloy powder by smelting iron, nickel, manganese, aluminum, silicon and chromium into alloy and adopting an evaporation condensation method. Then coating the surface of the superfine alloy powder with a phosphating film by using a medium-temperature zinc-manganese phosphating solution and a phosphating auxiliary agent, and then coating with a silicon dioxide layer to obtain coated low-loss superfine soft magnetic alloy powder; wherein the phosphating auxiliary agent at least comprises a sodium sulfonate derivative, and in the preparation of the sodium sulfonate derivative, azelaic acid dichloride and 1-octylene-3-alcohol are subjected to a reaction, and then sodium hydrogen sulfite is added for a reaction to obtain the sodium sulfonate derivative. The D50 particle size of the prepared low-loss superfine magnetically soft alloy powder ranges from 100 nm to 3000 nm; the resistivity is high, and the resistivity reaches 9.0 omega.cm or above; and the power loss is low and is lower than 320.3 mW / cm < 3 >, and the method can be used for preparing a high-performance inductor.

The invention provides a preparation method and device of prothioconazole. The preparation method comprises the following steps: carrying out Grignard reaction on o-chlorobenzyl chloride and magnesium powder in a mixed solvent of toluene and 2-methyltetrahydrofuran; the method comprises the following steps: carrying out Grignard addition reaction on a Grignard reagent and 2-chloro-1-(1-chlorocyclopropyl) ethanone; the preparation method comprises the following steps: carrying out substitution reaction on 1-chloro-2-(1-chlorocyclopropyl)-3-(2-chlorphenyl) propanol and hydrazine hydrate in an alcohol solvent; the preparation method comprises the following steps: carrying out ring closing reaction on 2-(1-chlorocyclopropyl)-1-(2-chlorphenyl)-3-hydrazino-2-alcohol, a formaldehyde solution, a sodium thiocyanate solution and a sodium hydrogen sulfate solution; the preparation method comprises the following steps: carrying out oxidation reaction on 2-(2-chlorocyclopropyl)-3-(2-chlorphenyl)-2-hydroxypropyl)-1, 2, 4-triazolidine-3-thioketone, air and inorganic alkali, so as to obtain prothioconazole. The method can improve the efficiency of the oxidation reaction and the yield and purity of prothioconazole, and is more suitable for industrial production of prothioconazole.

The invention discloses a preparation method and application of a copper powder sintered filter with the surface grafted with antibacterial hydrogel. Firstly, dopamine is used for carrying out surface treatment on the copper powder sintered filter to form a layer of protective film, so that corrosion is prevented, and the protective film can be tightly combined with later hydrogel. The preparation method comprises the following steps: soaking a filter sheet treated by dopamine into an aqueous solution of acrylamide, water-soluble polymer, N, N-methylene bisacrylamide and ammonium persulfate, then adding a mixed aqueous solution of silver nitrate and sodium hydrogen sulfite, uniformly mixing the solution under stirring, and rapidly catalyzing ammonium persulfate by silver ions to generate free radicals to initiate polymerization of acrylamide, so as to obtain the water-soluble polymer filter sheet. Sodium hydrogen sulfite and ammonium persulfate continue to initiate polymerization of acrylamide, the copper powder sintered filter is taken out and cross-linked through calcium nitrate, and the copper powder sintered filter with the antibacterial hydrogel grafted on the surface is obtained and applied to removal of emulsified oil and algae. Part of silver ions in the hydrogel react with copper to obtain nano-silver, and the hydrogel is endowed with good antibacterial performance.

The invention relates to the technical field of chemical synthesis, in particular to a preparation method of 2-sulfydryl-6-chlorobenzoic acid, which comprises the following steps: dissolving chlorobenzoic acid in dimethyl sulfoxide, adding sodium hydrogen sulfite, and stirring at room temperature; the preparation method comprises the following steps: dissolving mercaptobenzoate in dimethyl sulfoxide, adding sodium carbonate and dimethylamino, and reacting at high temperature; cooling to room temperature, and adjusting the pH value to be neutral by using dilute acid; adding into diethyl ether, uniformly mixing, adding into dilute acid, and standing for layering to obtain 2-sulfydryl-6-chlorobenzoic acid; the preparation method of the chlorobenzoic acid comprises the following steps: mixing parachlorotoluene with water, adding a supported catalyst, stirring and heating; after the temperature rises to 80 DEG C, adding potassium permanganate in batches for reaction; and filtering, adjusting the pH value to be acidic by using dilute acid, and then carrying out suction filtration and drying to obtain the chlorobenzoic acid. According to the preparation method disclosed by the invention, chlorobenzoic acid and mercaptobenzoate are subjected to a reaction to obtain 2-mercapto-6-chlorobenzoic acid with high yield; the method has the characteristics of simplified operation, energy consumption reduction, shortened production period and low production cost.

The application discloses a kind of high-altitude area weathering bridge steel member rust layer stabilizing treatment agent and use method, mainly solve the rust layer of high-altitude area weathering bridge steel member is difficult to stabilize and surface rust layer color is not uniform, rust liquid flow and other problems.The stabilizing treatment agent is composed of fast rusting agent and rust layer stabilizer, the fast rusting agent is composed of ferric chloride, copper sulfate, hydrogen peroxide, ethylene glycol and deionized water, the rust layer stabilizer is composed of sodium polyphosphate, sodium bisulfite and methanol and deionized water.The treatment agent of the application is suitable for the harsh environment of low temperature, oxygen is rare, inorganic salt system treatment agent is prone to icing in high sea area, the surface of high-altitude area weathering bridge steel member after processing forms brown rust layer with uniform color, no rust liquid flow.The rust layer of weathering bridge steel member can be stabilized within 8 hours by using the application, the thickness of the rust layer after processing is greater than or equal to 50 μm, the surface rust layer color difference value ΔE of different parts of the component is less than or equal to 10, and the amount of surface rust layer of the component is greater than or equal to 15 g / m 2 .

The invention provides a composition for preservation of vitamin D and vitamin K, an alternative matrix and application, and relates to the technical field of detection reagents. The composition comprises 0.5-3 mol / L of sodium pyrosulfite, 0.5-3 mol / L of sodium hydrogen sulfite and 0.5-3 wt% of lipoprotein lipase, and the technical problems that vitamin D and vitamin K are unstable and prone to failure are solved.

The invention provides a preparation method of a modified nano particle-acrylamide copolymerization type anti-scouring flocculating agent. The preparation method comprises the following steps: firstly, partially modifying nanoparticles by using a silane coupling agent; then taking the modified nanoparticles, acrylamide and acrylic acid as monomers, taking ammonium persulfate, sodium hydrogen sulfite and azobis (isobutylamidine) as initiators, and synthesizing modified nanoparticle-acrylamide copolymerized hyperbranched polymer gel by using an aqueous solution polymerization method under a nitrogen condition; and finally, granulating, drying and crushing to obtain flocculant powder. According to the present invention, the hyperbranched polymer molecules using the nanoparticles as the core and the organic polymer as the branched chain are adopted as the flocculant to improve the flowing water washing resistance and the dispersion resistance of the underwater non-dispersible concrete mixture, and the water reducing agent has the certain water reducing effect so as to effectively improve the concrete fluidity;

The invention discloses a method for producing chlorinated electrodeposited cobalt from a high-iron-silicon raw material. The method comprises the working procedures of slurrying dissolution, pre-removal of iron and silicon from the raw material, iron removal, extraction and impurity removal, nickel-cobalt separation, purification and impurity removal, electrodeposition and the like. According to the method, industrial sulfuric acid, sodium hydrogen sulfite, sodium carbonate, alkali and the like are added, proper reaction temperature, reaction time, reaction node pH and other factors are controlled, a pure cobalt chloride solution is obtained, and electrodeposited cobalt is obtained after electrodeposition. The cobalt content of the iron slag is lower than 0.2%; nickel sulfate contains less than or equal to 0.05 g / L of cobalt; the copper chloride after extraction contains less than or equal to 0.5 g / L of cobalt, more than or equal to 7g / L of copper and more than or equal to 10g / L of manganese. Precious metals such as copper and manganese are enriched in a copper chloride solution for external application. The method has the advantages that the cobalt leaching rate is high, the grade rate of finished product cobalt is high, and iron and silicon in the raw materials are effectively removed.

The invention relates to the technical field of high-molecular polymer synthesis, and particularly discloses a cracking method of high-alkalinity polysulfide rubber latex, which comprises the following steps: S1, carrying out mother liquor separation on polysulfide rubber latex, and then washing for 0-2 times to obtain the high-alkalinity polysulfide rubber latex; and S2, cracking the high-alkalinity polysulfide rubber latex into liquid polysulfide rubber by using a cracking agent composed of sodium sulfite, sodium hydrogen sulfite and sodium hydrosulfide, wherein the molecular weight of the liquid polysulfide rubber is 1000-5000. Compared with the prior art, the cracking agent composed of sodium sulfite, sodium hydrogen sulfite and sodium hydrosulfide is adopted, high-alkalinity polysulfide rubber latex can be cracked, the washing frequency is reduced, the process efficiency is improved, and the overall polysulfide rubber production efficiency is indirectly improved; meanwhile, the wastewater discharge amount is reduced, and the subsequent wastewater treatment cost is reduced. The raw materials required by the cracking agent are easy to obtain and low in cost.

The invention provides an oxytetracycline injection and a preparation method thereof, and belongs to the technical field of medicine preparation, the preparation method comprises the following steps: uniformly mixing 35-50 parts by weight of polyethylene glycol 400 and water, sequentially adding 0.4-0.6 part by weight of sodium formaldehyde sulfoxylate and 1.6-1.8 parts by weight of magnesium oxide, heating, adding 18-22 parts by weight of oxytetracycline, carrying out a complex reaction, adding monoethanolamine to adjust the pH value to 8.4-8.6, and uniformly stirring to obtain the oxytetracycline injection. And fixing the volume and filtering to obtain the oxytetracycline injection. The oxytetracycline injection prepared from the oxytetracycline can effectively improve the stability and the drug effect, prolong the half-life period of the drug and reduce the irritation.

The present invention belongs to the technical field of poly 3-hydroxybutyrate utilization, and relates to a method for preparing R-3-hydroxybutyrate by catalyzing the degradation of poly 3-hydroxybutyrate with sodium bisulfate as a catalyst. Poly 3-hydroxybutyrate, sodium bisulfate catalyst and solvent are mixed evenly and reacted, and after the reaction is completed, the temperature is lowered, water is added and stirred for stratification, and the upper solution is distilled to recover the solvent and the target product, and the lower solution is evaporated and concentrated, and sodium bisulfate is recovered by cooling and crystallization. The method of the present invention is simple in process and easy to operate, solves the problems of large environmental pollution, inability to recycle and reuse, and troublesome post-processing of traditional homogeneous catalysts, realizes the recovery and reuse of catalysts, and efficiently prepares R-3-hydroxybutyrate at the same time, with a yield of up to 128wt%, and a sodium bisulfate recovery rate of 96%.

The invention provides an environment-friendly low-chlorine wet strength agent and a preparation method and application thereof.The preparation method comprises the steps that adipic acid and tetraethylenepentamine are mixed and react for 2-6 h at the temperature of 170-190 DEG C, and a prepolymer is obtained; cooling the prepolymer to 120-140 DEG C, adding a modifier, carrying out a heat preservation reaction for 2-3 h, and adding deionized water to adjust the solid content to 55-65% so as to obtain a modified polyamide solution; adding a cationizing agent and epoxy chloropropane into the modified polyamide solution, heating to 65-75 DEG C, reacting, and adding acid to adjust the pH value to 2.5-4.5 when the viscosity of the system reaches 50-80 mPa.s; adding sodium hydrogen sulfite, and carrying out heat preservation reaction for 1-2 hours; and adding deionized water to adjust the solid content to 12-13%, thereby obtaining the environment-friendly low-chlorine wet strength agent. The specific modifier is adopted to modify a polyamide main chain, and the cationizing agent is introduced, so that the prepared wet strength agent not only can remarkably reduce the content of organic chlorine in a product, but also can improve the dry and wet strength, water resistance and folding resistance of paper. In addition, the product can also shorten the curing time of the paper.

The invention provides a method for preparing 1, 2, 4-trifluorobenzene, which belongs to the field of fluorine-containing intermediate preparation, and comprises the following steps: (1) adding 2, 4, 5-trifluoroaniline, hypophosphorous acid and a catalyst into dialkyl carbonate to obtain a mixed solution; (2) adding a nitrosyl sulfuric acid solution into the mixed solution obtained in the step (1), and reacting for a certain time; and (3) separating the reaction liquid in the step (2) to obtain the 1, 2, 4-trifluorobenzene. The method has the advantages of simple process, mild reaction conditions, no generation of waste water and sodium bisulfate, recycling of the catalyst, maximum utilization of cuprous oxide, maximum reduction of pollution and full utilization of resources. The conversion rate is as high as 100%, the selectivity is as high as 99% or above, and the product purity is as high as 99.9% or above.

The application discloses a kind of polymer oil displacement agent for carbonate fractured-vug type reservoir and preparation method thereof, step 1, with acetone and ethanol mixed solution as solvent, N, N-dimethylpropylene diamine, diethyl ether and perfluorinated nonanoic acid are added into acetone-ethanol mixed solution, after complete reaction, chloropropene is added, continue to react, after reaction is finished, solvent is removed by evaporation, to obtain fluorocarbon cation hydrophobic monomer CF-1;Step 2, white oil, emulsifier Span80 and Tween80 with mass ratio of 35-45:1-3:1-2 are mixed uniformly to obtain oil phase;AM, sodium p-styrenesulfonate and fluorocarbon cation hydrophobic monomer CF-1 are dissolved in deionized water, sodium bisulfite is added, and stirred uniformly to obtain aqueous solution;The aqueous solution is added to the oil phase to obtain a uniform emulsion, ammonium persulfate is added, and the polymer oil displacement agent is obtained by reaction. It has higher temperature resistance and salt resistance, and greatly reduces the adsorption of carbonate reservoir on the oil displacement agent.

The invention belongs to the field of superoxide anion free radical detection, and particularly relates to a reversible fluorescent probe for detecting superoxide anion free radicals as well as a synthesis method and application of the reversible fluorescent probe. The fluorescent reversible probe is 3-(benzothiazole-2-yl)-[1, 1 '-biphenyl]-2, 3', 4 '-triphenol. The preparation method comprises the following steps: dissolving 3-bromo-2-hydroxybenzaldehyde in absolute ethyl alcohol, adding sodium hydrogen sulfite and o-aminothiophenol, and carrying out heating reflux reaction; dissolving a reaction product and 3, 4-dimethoxyphenylboronic acid in tetrahydrofuran, adding a potassium carbonate solution and tetrakis (triphenylphosphine) palladium, and carrying out heating reflux reaction; and dissolving the product obtained by the reaction in dichloromethane to completely dissolve the solid, adding boron tribromide, and reacting under the ice salt bath condition to obtain the target probe. The fluorescent reversible probe can be used for superoxide anion free radical detection, and the detection method is simple, convenient to operate, good in selectivity, high in sensitivity, long in emission wavelength, large in Stokes shift and high in signal-to-noise ratio.

The invention relates to a preparation method of a diformaldehyde gemini surfactant. Mannich reaction is adopted, a long-chain fatty amine component, glyoxal and sodium hydrogen sulfite are used as reaction raw materials, a single variable method is used for controlling reaction conditions, and the optimal conditions of the reaction are explored as follows: the reaction temperature is 60 DEG C, the reaction time is 5 h, and the molar ratio of glyoxal to sodium hydrogen sulfite is 1: 2.3. Then, all products are dissolved with trichloromethane, ethyl acetate is added into the solution to separate out the products, the products are treated through a secondary crystallization method, the product calculation yield is obtained, and the content of 1, 2-bis (dodecyl amino) ethane-1, 2-sodium disulfonate, 1, 2-bis (tetradecyl amino) ethane-1, 2-sodium disulfonate, 1, 2-bis (hexadecyl amino) ethane-1, 2-sodium disulfonate, 1, 2-bis (hexadecyl amino) ethane-1, 2-sodium disulfonate and 1, 2-bis (hexadecyl amino) ethane-1, 2-sodium disulfonate is measured. The synthetic yields of the 1, 2-sodium disulfonate are 65.8%, 67.5% and 76.8% respectively. And characterization is carried out through a nuclear magnetic resonance spectrometer and an infrared spectrometer.

The invention discloses a synthesis method of a thioether compound. The synthesis method comprises the following steps: reacting 3-fluorotoluene with chlorosulfonic acid to obtain 4-fluoro-2-methylbenzenesulfonyl chloride; the preparation method comprises the following steps: dissolving 4-fluoro-2-methylbenzenesulfonyl chloride with acetic acid, adding acetic anhydride and red phosphorus, heating to 80-90 DEG C, adding elemental iodine in batches, and reacting to obtain (2-methyl-4-fluorophenyl) thioacetate; the preparation method comprises the following steps: dissolving (2-methyl-4-fluorophenyl) thioacetate with methanol, adding sodium formaldehyde sulfoxylate and potassium carbonate under the protection of nitrogen, and reacting; cooling the system to room temperature, dropwise adding 2, 2, 2-trifluoroethyl trifluoromethanesulfonate, and reacting to obtain (4-fluoro-2-methylphenyl) (2, 2, 2-trifluoroethyl) sulfane; the preparation method comprises the following steps: dissolving (4-fluoro-2-methylphenyl) (2, 2, 2-trifluoroethyl) sulfane with concentrated sulfuric acid, adding NBS (N-bromosuccinimide), and reacting to obtain (4-fluoro-5-bromo-2-methylphenyl) (2, 2, 2-trifluoroethyl) sulfane.

An animal litter, process for preparing the animal litter, and a method for removal of animal waste using the animal litter are provided. The animal litter generally includes at least one sorbent and a sulfate such as sodium bisulfate. The animal litter is in the form of discrete plural particles which tend to agglomerate when wetted.