368 results about "Sulfanilic acid" patented technology

The invention relates to a sulfonylation graphene oxide magnetic adsorbent, and a preparation method and application thereof. The adsorbent uses graphene oxide nanosheet as a substrate; the substrate surface is loaded with magnetic ferrite nanoparticles, and contains a large amount of sulfonic acid. The method comprises the following specific steps: first subjecting a graphite powder to pre-oxidation and deep oxidation, and conducting ultrasonic separation to obtain a graphene oxide solution; then adding a mixed solution of iron ions and ferrous ions; rapidly adding ammonia solution while stirring to obtain magnetic graphene oxide; and finally grafting aminobenzene sulfonic acid to magnetic graphene oxide matrix, washing and determining a constant volume to obtain a final product. The product has good adsorption effect on the heavy metals, copper and cadmium, and organic aniline. The product has the advantages of low cost, large specific surface area, high adsorption capacity and easy separation and recovery. The invention can be used for treating wastewater from smelting factory, electronics factory, chemical plant and electroplating plant.

The invention relates to an etchant composition and an etching method, wherein, the etchant composition comprises any two components of oxidants, acid and salt, and the pH value of the etchant composition is between 1 and 7. The oxidant components are selected from hydrogen peroxide, ammonium persulfate, potassium persulfate and ceric ammonium nitrate; the acid components are selected from chloric acid, perchlorate, acetic acid, nitric acid, hydrofluoric acid, sulfuric acid and oxalic acid, and the salt components are selected from ammonium fluoride, ammonium bifluoride, diammonium phosphate, ammonium phosphate, ammonium chloride and perfluorinated octyl sulfanilic acid (C8F17SO3NH4).

The invention relates to the technical field of gene transfer materials, particularly a preparation method of nano sulfonated graphene and application of nano sulfonated graphene as a gene transfer material. The preparation method of the nano sulfonated graphene comprises the following steps: 1. preparing graphene oxide; 2. preparing reduced graphene oxide; 3. preparing diazonium salt of sulfanilic acid; and 4. preparing the nano sulfonated graphene. The nano sulfonated graphene can be used as a gene transfer material since positive charges of ions on particle surfaces can be combined with green fluorescent proteins in a non-covalent mode to perform transfection; and when being used as a gene transfer material, the nano sulfonated graphene has the advantages of high transfection effect, favorable cell compatibility and high cell survival rate. The transfection efficiency of the nano sulfonated graphene in human breast cancer cells is up to 40% or so.

The invention relates to a chip type high-voltage aluminum electrolytic capacitor, an electrolyte thereof and a preparation method of the electrolyte. The electrolyte comprises the following components of 38.5-77.2% of a main solvent, 10-20% of an auxiliary solvent, 5-25% of a solute, 2.5-5% of an antiseptic, 5-10% of a high-temperature stabilizing agent, 0.2-1% of a hydrogen removal agent and 0.1-0.5% of a hydration-proof agent by weight. The solute is at least one selected from ammonium 2-n-hexyl adipate, ammonium octaned icarboxylate acid, butly octanedioic acid, ammonium 2-n-hexyl adipate oxalate, ammonium sebacate, sebacic acid, ammonium hydrogen azelate, ammonium azelate and ammonium pentaborate. The high-temperature stabilizing agent is at least one selected from polyvinyl alcohol, polyvinyl acetaldehyde, polyvinylpyrrolidone, polyvinyl alcohol succinate and sulfanilic acid. The high temperature resistance is high.

The invention provides a preparation method of symmetric and asymmetric toluylene triazine liquid fluorescent brightener composite expressed by the structural formulas (III), (VI) and (V), comprisingthe following steps: taking cyanuric chloride, sulfanilic acid, 4, 4-diaminobenzil-2, 2-disulfonic acid, morpholine and diethanol amine as raw materials; synthesizing by the three steps of reaction; and desalinating and filtering by means of nanofiltration membrane filtration. The liquid fluorescent brightener composite has a built synergistic effect and better brightening effect than a single composite; and the method not only can improve the quality of the fluorescent brightener, but also can reduce the consumption of amounts of raw materials, and greatly elevates product yield and quality.

The present invention relates to new photocatalyst material and its preparation process and application. The technological scheme is that the photocatalyst material consists of active carbon fiber and supported titania in the titanium element content of 12-15 wt%. Through dissolving tetrabutyl titanate in anhydrous alcohol, soaking active carbon fiber in the solution for 5-8 hr, heating the soaked active carbon fiber to 180-220 deg.C while introducing hot water vapor, calcining at 550-700 deg.C in nitrogen atmosphere and cooling naturally to room temperature, the supported photocatalyst material is prepared. When the photocatalyst material is used, the solution is irradiated with ultraviolet ray in the solution surface irradiation amount of 12.5-12.8 mW / sq cm at constant temperature of 20-40 deg.C while introducing air to maintain the concentration of dissolved oxygen. The present invention can degrade the methylene blue and sulfanilic acid in the solution completely.

This invention relates to a method for preparing high-performance aminosulfonic acid-series water reducer with polyether-grafted comb-like molecular structure for cement. The high-performance aminosulfonic acid-series water reducer is prepared from: p-aminobenzenesulfonic acid 100 parts, NaOH 115-140 parts, phenol 10-100 parts, modified polyether 0-90 parts, formaldehyde 300-600 parts, and water 3000-10000 parts. The method comprises: dissolving p-aminobenzenesulfonic acid, NaOH, phenol and modified polyether in water at 5-50 deg.C, heating to 50-120 deg.C, dropping formaldehyde, and keeping the temperature for 1-9 h. The high-performance aminosulfonic acid-series water reducer can effectively inhibit the collapse loss of concrete. The high-performance aminosulfonic acid-series water reducer has high workability, and water cannot infiltrate into concrete containing it.

The invention relates to catalytic carbon fibers and a preparation method. The catalytic carbon fibers are formed by combining carbon fibers and metal phthalocyanine as well as sulfanilic acid in a covalent bond manner. The used metal phthalocyanine is characterized by having a structure in a formula 1 shown in the Specification, wherein M can be iron, cobalt, nickel, manganese, copper, rubidium, zinc, platinum and palladium transition metal ions; R1 is -NH2; R2, R3 and R4 respectively are any one of -H, -NH2, -COOH, -NO2, -NHCOCH3, -NHSO3H, -SO3H. The method comprises the following steps: selecting the metal phthalocyanine comprising the amino group; under the condition of 60 to 90 DEG C, adding the sulfanilic acid, the carbon fibers and a condensing agent and performing the reaction for a certain time; taking out the carbon fibers loaded with the metal phthalocyanine; repeatedly washing; drying at a temperature of 80 to 100 DEG C to obtain the catalytic carbon fibers. The method has the advantages of simple equipment, simple and convenient process, easiness for operation and the like.

The invention provides fluorescent carbon quantum dots for monitoring pH of an acid environment and a preparation method and application of the fluorescent carbon quantum dots. The preparation methodcomprises the steps that (1) absolute ethyl alcohol is added into o-phenylenediamine and p-aminobenzene sulfonic acid, and after sufficient stirring, ultrasonic dissolution is conducted; (2) the abovemixture is transferred into a hydrothermal reaction kettle, and the hydrothermal reaction kettle is placed in a drying oven for a reaction for 8-10 hours at 180-200 DEG C; (3) after the reaction is stopped, standing, cooling to the indoor temperature, filtration, centrifugation and removal of undissolved substances are conducted, a blue-black solution is obtained, and after filtration by a filtering membrane, a pure carbon dot aqueous solution is obtained; (4) the above carbon dot aqueous solution is subjected to vacuum drying to obtain the target product. The method is simple, the requirements for preparation conditions are low, and pretreatment and a purification process are not needed. The prepared carbon quantum dots have the advantages of long wavelength transmission, a stable optical property, good biocompatibility, the high quantum yield and the like; the carbon quantum dots quite sensitively respond to the pH, can quickly penetrate through the cell membranes, enter cells and monitor fluctuation of the pH in living cells in real time, and are capable of being used for monitoring the pH of the acid environment, especially the pH of an extremely acid environment.

In the invention, biological polysaccharide macromolecule of tamarind gum, sand-Wormwood gum, anthogen gum and guar gum etc. are used as prepn. material, Fe3O4, is magnetic fluid, formaldehyde is cross-linking agent, sulfanilic acid sulhonyl polysaceharide hydrocarbon radial is used to prepare magnetic microball with higher magnetic responsiveness, which is surface porous honeycomb texture, aperture is 2.0X102-6.3X102 um, magnetisability is 1.393-1.726 emu / g, surface function radical is -OSO2(C6H4)NH2.

The invention discloses a preparation method for 6-sulfonic acid liquid fluorescent brightener. In the prior art, cyanuric chloride, DSD acid, sulfanilic acid and diethanolameine are subjected to three-step condensation to obtain the optical brightener; and when the fluorescent brightener is applied to paper, the highest whiteness is not high, the chromatic light is cyan light, the surface of the paper is dark and the reactivity is not high. The preparation method comprises the following steps: a) aniline-2, 4-disulfonic acid and aniline-2, 5-disulfonic acid are reacted with the cyanuric chloride to obtain a mixture of benzene-2, 4-(4, 6-dichlorotriazine-2-amino) disulfonic acid and benzene-2, 5-(4, 6-dichlorotriazine-2-amino) disulfonic acid; and b) the mixture obtained in step a) and 4,4-diaminostilbene-2,2-disulfonic acid firstly undergo the second step condensation, the obtained product and drewamine undergo the third step condensation, and finally the 6-sulfonic acid liquid fluorescent brightener composition is obtained. The product of the invention has the function of compounding enhanced effect, solves the problem of poor stability of single component and greatly improves the yield and quality.

The invention relates to a biquaternary ammonium salt and bisulfonate surfactant, which is N,N'-ethylene bis[ethyl alkyl (sodium) p-benzene-sulfonate ammonium bromide]. The synthesis method of the biquaternary ammonium salt and bisulfonate surfactant comprises the following steps of: (1) dissolving a sodium hydroxide in a mixed solvent of ethanol and water to prepare solution, adding the solution into a three-necked flask with a stirrer and a return condenser, then adding a sulfanilic acid into the flask and slowly dripping 1,2-dibromoethane under a condition of a pH value of 8 to 10; (2) adding the product generated by step (1) in a reactor, adding a long-chain bromoalkane with stirring, adjusting the pH to around 8 and iltering out and drying a precipitate precipitated after the reaction is completed; and (3) adding the product generated by step (2) into a reactor, adding a mixed solution of distilled water and ethanol, stirring the solution to dissolve the product, adding an bromoethane, adjusting the pH to around 8, cooling the solution, filtering out under vacuum, washing and drying precipitate precipitated when the reaction is completed and thus obtaining the surfactant. The surfactant has the advantages of very high surface activity, simple synthesis method, mild reaction condition, simple and convenient operation, easy purification and separation and very good formulation performance.

The invention is about preparation method of amino sulfoacid water reducing agent. The part by weight of different component is 200 portion of water, 30-50 portion of phenol, 60-90 portion of diamino benzene sulfonic acid or diamino benzene sulfonate, 0-10 portion of urea. The reactor is heating-up to 50-90deg.C, and condensating agent formaldehyde is 50-70portion. Stirred after 4-8 hours, 1-10 portion of alkalinous conditioning agent and 0-2 portion of triethanolamine is added. Stired until it is to room-temperature, then the liquid water reducing agent is gaine. In the invention, diamino benzene sulfonic acid can be sulfanilic acid, diamino benzene sulfonate can be p-amino benzene sulfonate. The water reducing agent has high reducing rate, can control the loss of slump constant, and has high applied value.

The invention discloses a low-cost modified amino-sulfonic acid-based high-efficiency water reducer and a preparation method thereof. The preparation method comprises the following steps of: adding 25-35 parts by weight of water into a reaction kettle, heating the water to 65-70 DEG C, inputting 10-17 parts by weight of interaction sulfanilic acid, 9-14 parts by weight of industrial waste phenolic residue and 3-5 parts by weight of pH value regulator, and raising the temperature to 85-90 DEG C while stirring; dropwise adding 18-26 parts by weight of formaldehyde within 15-30min, and keeping the temperature to be 92-95 DEG C for 2-6h; and adding 1-2 parts by weight of pH value regulator and 15-22 parts by weight of straw pulp black liquor, keeping the temperature within 85-90 DEG C for 2-4h, and cooling to the room temperature to obtain a liquid product. The product is prepared by utilizing a rough industrial product and industrial wastes with lower price as synthesis monomer and modifiers, thereby improving the inherent defects of mixing amount sensitivity and easy bleeding and bottom pushing of concrete of the amino-sulfonic acid-based high-efficiency water reducer, lowering the production cost of the water reducer, fully utilizing the industrial wastes and reducing the environmental pollution.

The invention relates to a reaction-type halogen amine antibacterial agent, and a synthetic method and application thereof. The antibacterial agent is a compound with a structure shown in a formula (I). The synthetic method is as follows: dropwise adding a sulfanilic acid solution into a cyanuric chloride or cyanuric fluoride solution, reacting at 0-20 DEG C for 1-4 h, then adding 2,2,6,6-tetramethyl-4-piperidine alcohol solution, reacting at 20-60 DEG C for 2-6 h, filtering, purifying and drying to obtain a precursor of the halogen amine antibacterial agent, and carrying out halogenation to obtain the finished product of the halogen amine antibacterial agent. Application of the halogen amine antibacterial agent to antibacterial finishing of textile is as below: dissolving the precursor of halogen amine antibacterial agent and a metal salt catalyst in the water to prepare a finishing liquid, immersing the textile in the finishing liquid, adding an alkali agent, impregnating at 40-60 DEG C for 2-6 h, taking out the textile, washing and drying the textile, and carrying out halogenation to obtain antibacterial textile. The antibacterial agent provided by the invention has superior antibacterial properties, and the precursor has good water solubility; textile subjected to finishing of gains superior bactericidal functions and high sterilization rate and efficiency; and the method has the advantages of simple process, no toxicity or pollution, and meets the processing requirements of ecological textiles.

The invention provides a preparation method and application of a composition for decomposing low-molecular aldehyde without illumination. The composition mainly comprises chitin, EDTA, carbohydrazide, glycerin, polyethylene glycol, dicyandiamide, sodium phytate, phytic acid, glucoside, sodium sulfanilate, mannitol, citric acid, sodium thiosulfate, modified starch, cellulose, gelatine powder, aluminum oxide, silica, diatomite and kaolin. The composition can be used for removing formaldehyde, acetaldehyde and other low-molecular aldehyde and harmful small polar molecules in gas-liquid-solid phase substances. The composition can be used for removing residual formaldehyde in decorative materials in buildings, and an aqueous solution and the gas state of the composition can be used for decomposing formaldehyde in the liquid phase and the gas phase. Solid of the composition can be added into materials such as indoor building materials, wallpaper glue, diatom ooze, seashell ooze, silicon balls, diatom balls, interior wall coating materials and water-based paint. According to a decomposing function of the composition, one part of the composition with the components can decompose 2 parts of formaldehyde solutions (40%), salt and water are generated, secondary pollution is avoided, illumination is of no need, and the formaldehyde decomposition rate can reach 99.7% or over.

The invention relates to a method of synthesizing porous charcoal containing nitrogen, sulfur and other hetero atoms based on Schiff base chemistry and by utilizing an in-situ solid phase process. A Schiff base reaction between an amino-containing aromatic ring compound (melamine, sulfanilic acid, and the like) and an aromatic-ring-containing aldehyde (terephthalaldehyde, 1,3-benzenedialdehyde or 4,4'-biphenyldicarboxaldehyde) is utilized to generate a nitrogen-containing sulfur-containing polymer. Through a gas-solid phase reaction between a reducing atmosphere such as carbon oxide compounds generated in a pyrolysis process of the polymer and lithium oxide, carbonate is generated in an in-situ manner and adopted as a template for preparing the charcoal material, and acid washing is performed to remove the template to obtain the honeycomb porous charcoal material containing nitrogen, sulfur and the like. According to the method, the method is simple to operate, equipment is simple, and the template is generated by an in-situ reaction, thus further preparing the porous structured charcoal material. Through regulating and controlling experiment parameters, the multistage porous charcoal material which contains nitrogen, sulfur and other hetero atoms, which has controllable morphology and an adjustable pore channel structure can be prepared.

The invention provides a modified sulfamate efficient water reducer and a preparation method thereof, particularly relates to a dinaphthol waste modified sulfamate efficient water reducer and relates to the technical field of waste treatment. The reducer comprises raw materials of, by weight, 120 parts to 130 parts of sodium sulfanilate, 400 parts of dinaphthol waste, 95 parts of phenol, 170 parts of formaldehyde, 25 parts of liquid caustic soda (30%), 30 parts to 50 parts of urea, 1 part to 10 parts of dodecyl diphenyl ether sodium disulfonate and 180 parts to 260 parts of water. By means of the water reducer and the preparation method thereof, dinaphthol waste recycling is achieved, waste water are not needed to be subjected to concentration or any other treatment of physical chemical treatment and the like, energy consumption is saved, and pollution and damage of the waste to the environment and humans are prevented.

A disclosed preparation method for sulfonated oxidized graphite comprises: vacuumizing oxidized graphite to have a pressure less than 1 Pa, and keeping oxidized graphite under the temperature condition of 190 DEG C for 5 h, so as to obtain pre-reduced graphite; adding sulfanilic acid crystal into a sodium hydroxide solution with the concentration of 2%, dissolving and cooling to room temperature; adding sodium nitrite, dropwise adding the mixture solution into a beaker containing ice water and concentrated hydrochloric acid with stirring, controlling the temperature to be 5 DEG C or less, continuing to react with stirring for 15 min when a fine-granular white precipitate of sulfanilic acid diazo salt appears, so as to obtain sulfanilic acid diazo salt; adding sulfanilic acid diazo salt into a suspension of the pre-reduced oxidized graphite in batches, stirring under the condition of ice bath for 4 h, washing with deionized water to be neutral to finally obtain sulfonated oxidized graphite, and fully drying in a vacuum baking oven at a temperature of 60 DEG C, so as to the product. The method is simple and easy to operate, and graphene can be relatively well prepared after graphite is subjected to sulfonation processing.

The invention discloses a preparation method for triazine-stilbene liquid fluorescent brightener. The prior preparation method has the following problems: secondary reactions are numerous, the yield of the product is low and the quality of the product is poor. The preparation method comprises the following steps: a) cyanuric chloride, sulfanilic acid and metanilic acid undergo the first step condensation to obtain a mixture containing two components, namely 4-(4, 6-dichlorotriazine-2-amino) benzene sulfonic acid and 3-(4, 6-dichlorotriazine-2-amino) benzene sulfonic acid; and b) the mixture obtained in step a) and 4,4-diaminostilbene-2,2-disulfonic acid firstly undergo the second step condensation, the obtained product and diethanolameine undergo the third step condensation, and finally symmetrical and unsymmetrical triazine-stilbene liquid fluorescent brightener compositions are obtained. When whitening paper, the triazine-stilbene liquid fluorescent brightener has better whitening effect than single component, and has the function of compounding enhanced effect, and simultaneously the triazine-stilbene liquid fluorescent brightener has the advantages of good water-solubility, high whiteness and small use amount.

The invention discloses a method for preparing a modified starch tanning agent, comprising the following steps of: firstly, degrading corn starch; in the presence of HRP (Horse Radish Peroxidase) / hydrogen peroxide (H2O2), grafting and modifying the degraded starch with sulfanilic acid, gallic acid and nekal; and then oxidizing the grafted starch with periodic acid. The invention has the innovation points that a nekal structure unit is introduced in the starch structure so as to improve the permeation wetting function of the modified starch tanning agent; the gallic acid structure unit is introduced to improve the tanning properties of the modified starch tanning agent, the sulfanilic acid is introduced to increase the dispersivity of the modified starch tanning agent, and dialdehyde action is used for improving the tanning properties of the modified starch tanning agent. The preparation method of the invention is peculiar and practical, and the obtained tanning agent is an environmentally-friendly leather tanning agent and is suitable for primary tanning and retanning. The shrinkage temperature (Ts) of pickled leather after primary tanning can be improved to 75-80 DEG C; and the retanned product has the advantages of wash resistance, high absorption rate on dyes and fatting agents and the like, is soft and plump.

The invention discloses a method for preparing high-efficiency concrete water reducer of aromatic amino sulfonic acid through condensation reaction of waste water from synthesis process of p-aminophenol with sulfanilic acid and formaldehyde. The molar ratio of the materials of phenolic compound, sulfanilic acid and formaldehyde for condensation reaction during the preparation process is controlled to be 1:(0.5-1):(1.5-2.5); the molar ratio of phenol added to the sulfanilic acid is controlled to be (0-1):1; the reaction temperature and the pH value of the reaction solution are controlled on a segmental basis; and after the reaction is finished, the reaction solution is condensed under vacuum condition to obtain the high-efficiency water reducer liquid of aromatic amino sulfonate with the mass ratio of 40%. Not only is the environment pollution problem in the production process of p-aminophenol solved, but also the high-efficiency concrete water reducer of aromatic amino sulfonic acid with low cost can be prepared.

This invention relates to a quick test reagent box and its application of nitrite composed of a reaction post, colorimetric cylinder, 1-naphthol, sulfanilic acid hydrochloric acid solution, potassium ferrocyanide, zine acetate, borax saturated solution and a comparison card. The test method includes: preparing a sample process fluid to be processed in chromogenic reaction to compare with the comparison card and determine the content of nitrite in the sample to judge if it has exceeded the target by transformation, which can semiquantitatively test nitrite in foodstuff and the lowest detection limit is 0.1mg / kg.

The invention relates to a building sulfamate high-performance water reducer and its preparing method, synthesized of benzene solfonic acid, sodium hydroxide, phenol, formaldehyde and water, and the product mainly contains the groups: -CN, benzene ring, -SO3, etc, and the average molecular weight is 4000-9500. It can make the water reduction ratio of concrete up to above 25%, improve the fluidity of concrete by a large margin, makes the loss rate of concrete slump in 2 hours less than 10%, enhances the strength by a large margin, and improves the durability of concrete. It has better adaptability to various cements. It is applied to the constructions (structures) of premixed concrete commodity, high-strength high-performance concrete, reinforced concrete, etc.

The invention relates to a tetrasulfonic acid series of amphoteric triazine-DSD acidic fluorescent whitening agents, as well as synthesis and an application of the same. The series of fluorescent whitening agents are mainly applied to papermaking paint printing ink and textile. The synthesis adopts the following steps that: a. cyanuric chloride reacts with aminobenzene sulfonic acid at a temperature between 0 and 5 DEG C for 2.5 h, with pH value controlled to be between 1.8 and 2.1, so as to synthesize one-step condensation product; b. the one-step condensation product reacts with 4, 4'-diaminodiphenylethylene-2, 2'-disulfonic acid at a temperature between 40 and 45 DEG C for 2.5 h, with pH value controlled to be between 3.5 and 4.5, so as to synthesize two-step condensation product; the two-step condensation product reacts with a series of tertiary amine compounds at a temperature between 78 and 85 DEG C for 2.5 h, with pH value controlled to be between 7.5 and 8.5, so as to synthesize a series of amphoteric triazine-DSD acidic fluorescent whitening agents containing quaternary ammonium salt groups. Application results show that: the fluorescent whitening agents can be used under neutral / alkaline conditions, and has higher dye uptake rate and better whitening effect under acidic conditions.

The invention discloses an anionic emulsifier, and a preparation method and application thereof. The anionic emulsifier is prepared from sulfanilic acid, epoxy active diluent and epoxy resin according to a mol ratio of 1: 1: 1.05-1.15. Specifically, the preparation method comprises a step of preparing the anionic emulsifier with a solid content of 50 to 55% from epoxy resin, epoxy active diluent and sulfanilic acid under the catalysis of triphenyl phosphine. The structure of the anionic emulsifier provided by the invention is unique and innovative; and a benzenesulfonate group, an epoxy group (provided by the epoxy resin) and a lipophilic chain segment are introduced into a same molecule, so excellent emulsification performance of the anionic emulsifier is guaranteed, and the anionic emulsifier can be ideally applied to epoxy emulsion. The anionic emulsifier is a reactive anionic emulsifier and has strong emulsification and epoxidation capacity; and the anionic emulsifier can crosslink with an epoxy hardener so as to reduce the mobility of the anionic emulsifier in a paint film, so influence on water resistance is reduced.

The present invention discloses nitrite detecting test paper and its preparing process. The nitrite detecting test paper includes substrate and color displaying paper sheet fixed to the substrate. The color displaying paper sheet is prepared with filter paper and through soaking in water solution of N-(1-naphthyl)-vinyl diamine in 10-25 g / L concentration, drying in 30-40 deg.c, soaking in mixedwater solution of sulfanilic acid 10-30 g / L concentration and tartaric acid in 80-120 g / L concentration; and re-drying in 30-40 deg.c. The nitrite detecting test paper is easy to make, low in cost, high in detection precision, good in repeatability and simple in operation, and is used in on-line monitoring of nitrite in food, water and other samples.

The invention relates to a para-acetylsulfanilamide synthesis method combined with waste water treatment. The method comprises the following steps of: hydrolyzing reaction liquid (commonly called sulfonated oil) generated by chlorosulfonation of acetanilide and chlorosulfonic acid at low temperature; directly adding the reaction liquid hydrolyzed at low temperature into ammonia water to perform amination; and neutralizing and filtering to obtain solid para-acetylsulfanilamide (p-ASN), wherein the filtrate contains p-aminobenzene sulfonic acid and ammonium sulfate; the p-aminobenzene sulfonic acid in the filtrate is recovered by an adsorption method; and the ammonium sulfate is obtained by concentrating, crystallizing, filtering and drying the residual adsorption solution. The method has the advantages that: all the sulfuric acid generated after the sulfonated oil is hydrolyzed is converted into the ammonium sulfate, so the treatment problem of a large amount of high-concentration acidic waste water is solved from the source; the quantity of the liquid to be treated in the new process is 25 percent of that of the liquid to be treated in the conventional process, so a great amount of water resource and capital are saved; the byproducts such as the ammonium sulfate and the p-aminobenzene sulfonic acid can be recovered, so resources can be utilized circularly and comprehensively; and the steamed water in the concentration process of the ammonium sulfate and the p-aminobenzene sulfonic acid is neutral and can serve as industrial water to be recycled.

The invention discloses an environment-friendly lightweight calcium carbide slag aerated brick which is characterized by being prepared by the following raw materials by weight: 24-26 parts of calcium carbide slag, 4-7 parts of cement, 1-3 parts of catechol, 0.3-0.5 part of ferrosilicon alloy, 0.3-0.6 part of sulfanilic acid, 0.5-1 part of paclitaxel waste residues, 15-19 parts of diatomite, 9-11 parts of fly ash, 2-4 parts of glass fibers, 1-4 parts of sodium chloride, 3-6 parts of coconut oil, 11-14 parts of building waste regenerated powder (including building waste regenerated concrete powder and / or building waste regenerated brick powder), 0.4-0.9 part of polyacrylamide, 0.02-0.05 part of calcium bicarbonate, 0.02-0.05 part of sweet osmanthus, 0.04-0.08 part of radix stemonae, 4-6 parts of auxiliary agents, and a proper amount of water. The aerated brick processed in the invention has the characteristics of high finished product qualified rate, high compressive strength, low unit weight, high thermal insulation performance, and good sound-absorbing effect, and can be used as non-bearing walls or bearing walls.

The present invention discloses a preparation method of a sulfonated two-dimensional titanium carbide nanosheet, which comprises the following steps of preparing two-dimensional titanium carbide by using aluminum atomic layers in hydrofluoric acid chemical stripping layer-shaped titanium aluminum carbide; preparing sulfanilic acid diazosalt; conducting a sulfonation reaction between the two-dimensional titanium carbide and the sulfanilic acid diazosalt to prepare the sulfonated two-dimensional titanium carbide nanosheet. The sulfonated two-dimensional titanium carbide nano material prepared through the present invention has good dispersity in water and common organic solvents, and a single-layer or few-layer sulfonated two-dimensional titanium carbide nanosheet with large size and high quality can be obtained after ultrasonic treatment is performed on a dispersion liquid. The preparation method has the characteristics of low production cost, easiness in obtaining raw materials, and simplicity and controllability during preparation.