532 results about "Sulfamic acid" patented technology

The invention provides a sulfamic acid continuous crystallization production device and process, the sulfamic acid continuous crystallization production device comprises a filter box and a production box, the production box is fixedly connected to the upper surface of the filter box through bolts, the top end of the production box is provided with a feeding pipe, the middle part of the interior of the production box is provided with a partition plate, and the middle part of the partition plate is provided with a conveying pipe; a discharging pipe, a production reaction module and a filtering and cleaning module are arranged between the production box and the filtering box. According to the sulfamic acid continuous crystallization production device and the sulfamic acid continuous crystallization production process, in the sulfamic acid continuous crystallization production process, when sulfamic acid crystals are filtered out from mother liquor through the filter cartridge, purified water is sprayed into the filter cartridge through the spray head; and the sulfamic acid crystals can be quickly and uniformly washed to remove impurities through the filter cartridge which continuously shakes in a reciprocating manner in the rotating process, so that the continuous crystallization production efficiency of the sulfamic acid can be effectively improved.

The invention discloses a synthetic method of a water soluble ultraviolet light absorber BP-9. The method mainly comprises the following process steps: (1) carrying out methylation on the main raw materials of 2, 2', 4, 4'-tetrahydroxyl benzophenone, a transition metal salt catalyst and a mixed solvent which is prepared from dichloroethane and anhydrous ethanol in equal parts by weight to obtain 2, 2'-dihydroxyl-4, 4'-dimethoxyl benzophenone; (2) carrying out sulfonation reaction on the main raw materials of methylate, sulfamic acid and C1-C3 halohydrocarbon to obtain 2, 2'-dihydroxyl-4, 4'-dimethoxyl benzophenone-5, 5'-disulfonic acid; and (3) carrying out neutral reaction on the main raw materials of sulfonated product, inorganic base and ethanol water to finally obtain the BP-9 product. The synthetic method disclosed by the invention is few in reaction step, low in cost, high in product purity and stable in quality, and raw materials are easily available.

The invention discloses a method for extracting valuable metals from black powder of waste lithium ion batteries, and belongs to the technical field of recycling of waste lithium ion batteries. According to the method, valuable metals are extracted from the waste lithium ion battery black powder by adopting low-temperature roasting and water leaching, the waste lithium ion battery black powder is taken as a raw material, sulfamic acid is taken as a roasting agent, the waste lithium ion battery is pretreated, and roasting for carbon removal, metal extraction and water leaching are performed in sequence, so that the valuable metals are obtained. And leaching liquid and leaching residues containing two or more elements of lithium, nickel, cobalt, manganese, iron and aluminum are obtained and are used for further purification and recovery of valuable metals. According to the method provided by the invention, the influence of aluminum dissolution on recovery of other metals is reduced, the use of hydrogen peroxide is avoided, the process flow is shortened, the process cost is greatly reduced, the roasting and water leaching processes cannot corrode equipment, and the whole process cannot generate waste acid to cause secondary pollution.

The invention relates to an electrolyte for an aqueous zinc ion battery and the zinc ion battery. The electrolyte consists of soluble zinc salt, an electrolyte additive and solvent water, and the electrolyte additive is a thiazole derivative containing functional groups such as sulfydryl, amino, sulfonic acid group and formic acid group. According to the electrolyte provided by the invention, the electrolyte additive can regulate and control the coordination environment through coordination with zinc ions so as to realize uniform deposition of zinc, meanwhile, the electrolyte additive can also be grafted to the surface of zinc through functional groups such as sulfydryl, amino, sulfonic acid group and formic acid group so as to form a layer of stable protective film, and the protective film has good zinc affinity; direct contact between an electrolyte and the zinc negative electrode can be effectively blocked, chemical corrosion and hydrogen evolution reaction of the zinc negative electrode can be reduced, interface ion transmission can be regulated and controlled, zinc dendrite growth is effectively inhibited, the cycling stability of the zinc negative electrode is improved, the cycle life of the battery is prolonged, the rate performance of the battery is improved, and the method is easy and convenient to prepare, low in cost, high in safety and suitable for industrial production. The large-scale production is easy to realize.

The invention provides an environment-friendly PUR hot melt adhesive with excellent temperature resistance as well as a preparation method and application thereof, and belongs to the technical field of adhesives. The environment-friendly PUR hot melt adhesive is prepared from the following raw materials in parts by mass: 50 to 65 parts of polyester polyol, 10 to 20 parts of polyether polyol, 15 to 30 parts of isocyanate, 5 to 10 parts of modified isocyanate, 5 to 10 parts of chain extender and 3 to 5 parts of anti-aging additive, wherein the polyester polyol is formed by carrying out dehydration polycondensation on polybasic acid and polyol through a vacuum melting method, and the polybasic acid comprises binary acid, cinnamic acid, chlorogenic acid and tannic acid according to the mass ratio of (3-5): (0.5-0.8): (1.2-1.6): 1; the anti-aging auxiliary agent is a nano inorganic oxide containing a maleimide group; the modified isocyanate is a mixture obtained by reacting polyisocyanate, sulfamic acid, hydroxycarboxylic acid and tertiary amine. The PUR hot melt adhesive prepared by the invention has excellent thermal stability, and the cohesiveness of the PUR hot melt adhesive can be kept basically unchanged in a long-term high-temperature environment and a thermal cycle environment.

The invention relates to the technical field of sulfamic acid subpackaging, in particular to a subpackaging device for sulfamic acid production, which comprises a main body plate, a grinding mechanism for grinding sulfamic acid particles is arranged at the upper end of the main body plate, and the grinding mechanism comprises a first placing groove formed in the upper end of the main body plate; two symmetrically-arranged fixing rods are rotationally arranged in the first containing groove in the side face of the main body plate, grinding rollers are fixedly connected to the side faces of the two fixing rods correspondingly, and an air injection mechanism for drying and filtering sulfamic acid particles is arranged in the first containing groove and comprises a first screening plate; one end of the first screening plate and the inner side face of the main body plate are rotationally arranged; the controller can control the one-way control valve located on the lower half portion of the grinding roller to be started, so that heated and dried gas is exhausted through the one-way control valve on the lower half portion to dehumidify sulfamic acid particles, meanwhile, the sprayed gas can blow off sulfamic acid attached to the side face of the grinding roller in the grinding process, and adhesion is prevented.

The invention discloses a preparation method of salt-resistant sodium carboxymethyl cellulose, and relates to the technical field of petroleum fracturing materials. The preparation method comprises the following steps: reacting stearic acid with ethylenediamine to obtain a monosubstituted intermediate, reacting the monosubstituted intermediate with cocoyl chloride to obtain an intermediate 1, reacting the intermediate 1 with epoxypropane to obtain an intermediate 2, and reacting the intermediate 2 with paratoluensulfonyl chloride to obtain a hydrophobic intermediate; reacting a sodium carboxymethyl cellulose solution with the hydrophobic intermediate to obtain modified sodium carboxymethyl cellulose, and sulfonating the modified sodium carboxymethyl cellulose with sulfamic acid to obtain crude salt-tolerant sodium carboxymethyl cellulose; and reacting the crude product salt-resistant sodium carboxymethyl cellulose with borax to obtain the salt-resistant sodium carboxymethyl cellulose. The salt-resistant sodium carboxymethyl cellulose prepared by adopting a step-by-step synthesis strategy has excellent salt resistance, temperature resistance, shearing resistance and dissolution rate, and is suitable for thickening and sand carrying of high-temperature and high-salt oil and gas field fracturing fluid.

The invention discloses an anti-scaling composite membrane as well as a preparation method and application thereof. The preparation method of the anti-scaling composite membrane comprises the step of modifying a polyamide membrane to obtain the anti-scaling composite membrane. The modification mode of the polyamide membrane is that in-situ filtration is sequentially carried out on a polyphenol compound solution and a sulfamic acid compound solution through the polyamide membrane, and then modification is completed. According to the preparation method, surface modification is carried out on an existing polyamide membrane, the hydrophilicity of the surface of the polyamide membrane is improved, the chemical property of the surface of the membrane is changed, and therefore the anti-pollution performance of the polyamide membrane can be improved. After modification, the hydrophilicity of the surface of the polyamide membrane is increased, and the surface of the polyamide membrane has a polyphenol-sulfamic acid grafting layer. As the affinity of Ca < 2 + > ions, hydroxyl, sulfo groups and phosphate groups is relatively low, the acting force between the membrane surface and Ca scale is relatively weak, and the anti-scaling capability is relatively good.

The invention belongs to the technical field of waste recycling, and particularly relates to a method for recycling nitric acid in acid yellow water based on nitration. The method for recovering nitric acid based on nitration acid yellow water comprises the following steps: stirring nitration acid yellow water and toluene or nitrotoluene and other organic extraction agents in a mixer, adding a certain amount of sulfamic acid, fully extracting, standing for layering, and removing the organic extraction agents through a stripping tower to obtain the nitric acid. The acid yellow water after extraction-steam stripping is sent to a nitric acid absorption-concentration tower to obtain concentrated nitric acid, and the concentrated nitric acid is recycled to a nitration reaction unit as a raw material.

The invention relates to the technical field of high-wear-resistance alloys, and particularly discloses a preparation method of a high-wear-resistance alloy steel lining plate. The preparation method comprises the following steps that S1, an alloy steel lining plate is placed in a plating solution to be electroplated, and an alloy steel lining plate A with a plating layer A on the surface is obtained; the plating solution comprises the following raw materials: 45-60 g / L of sodium citrate dehydrate, 30-35 g / L of boric acid, 5-8 g / L of ammonium chloride, 80-100 g / L of nickel aminosulfonate, 180-200 g / L of iron aminosulfonate, 0.5-0.8 g / L of lauryl sodium sulfate, 2-5 g / L of modified boron nitride and the balance of deionized water. S2, an alloy steel lining plate A is taken, the surface of the alloy steel lining plate A is plated with a transition metal boride layer through arc ion plating, the transition metal boride layer serves as a plating layer B, and an alloy steel lining plate B is obtained; and S3, the alloy steel lining plate B is taken, boronizing is conducted after annealing, and the high-wear-resistance alloy steel lining plate is obtained.

The invention discloses an electrolytic solution of a platinum-rhodium alloy, a preparation method and a preparation method of a plating layer of the platinum-rhodium alloy, and belongs to the technical field of precise electroplating. The electrolytic solution comprises a platinum salt, a rhodium salt, a first additive, a second additive, a first complexing agent, a second complexing agent, a first stabilizer and a second stabilizer, the first additive is a sulfamic acid compound containing 3-4 hydroxyalkyl groups, the second additive is sulfamic acid salt containing 3-4 hydroxyalkyl groups, and the first complexing agent and the second complexing agent are a platinum salt and a rhodium salt. The first complexing agent is a mixture of dicarboxylic acid and dicarboxylic acid containing amino or hydroxyl, the second complexing agent is a salt corresponding to the dicarboxylic acid, and the first stabilizer is a mixture of alkyl sulfonic acid and alkyl sulfonate. Through the synergistic effect of the additive, the complexing agent and the stabilizer, the additive, the complexing agent and the stabilizer form a five-membered to seven-membered heterocyclic coupling structure with platinum ions and rhodium ions, and the stability of the electrolytic solution is remarkably improved. And the obtained platinum-rhodium alloy coating is compact and uniform, and has excellent nitric acid steam and mixed gas corrosion resistance.

The invention relates to the technical field of lead frame coarsening, in particular to a nickel coarsening process of a lead frame. A nickel coarsening process of a lead frame comprises the following procedures of oil removal, acid pickling, nickel electroplating coarsening and acid pickling, the nickel electroplating coarsening refers to that an electroplating coarse nickel layer is obtained in an electroplating bath loaded with nickel electroplating coarsening liquid in an electroplating mode, and the nickel electroplating coarsening liquid comprises 90-130 g / L of nickel aminosulfonate, 40-50 g / L of boric acid and 0.1-0.3 g / L of an additive. According to the nickel roughening process of the lead frame, the rough nickel layer can be directly obtained, and the copper substrate does not need to be treated, namely additional electroplating pretreatment is not needed. According to the nickel coarsening process, crystallization of nickel ions on the surface of the lead frame is remarkably affected in the nickel electroplating deposition process through the additive in the nickel electroplating coarsening liquid, the limiting current density of the nickel electroplating coarsening liquid is reduced, deposition of a high-current-density area is restrained, nearly-spherical round grains are formed, and the nickel electroplating quality is improved. Meanwhile, the process of electron deposition of nickel ions is accelerated, cathodic polarization is reduced, growth of nickel crystal nucleuses is promoted instead of nucleation, large-size particles are formed, the surface roughness is improved, an electroplating coarse nickel layer with certain roughness is finally formed, the content of nickel metal in an electroplating nickel coarsening solution cannot be continuously increased, wastewater discharge is reduced, and the production cost is reduced. The environment is protected.

The invention discloses a bacteriostatic food packaging bag and a preparation method thereof, and relates to the technical field of food packaging, the bacteriostatic food packaging bag comprises the following components by weight: 12-22 parts of bamboo fiber; 55 to 80 parts of TPS (Thermoplastic Polystyrene); 15-20 parts of a modified ethylene composite copolymer; 15 to 20 parts of modified chitosan; wherein the modified ethylene composite copolymer is obtained by polymerizing active group-containing ethylene and one of vinyl acetate, butene, hexene or octylene according to a molar ratio of 10: (3-6); the active group is at least one of amino and sulfonic acid group; the modified chitosan is sulfo-grafted chitosan, and the mass grafting rate is greater than 0.1 wt%. The preparation method has the advantages that the compatibility of a composition formula is improved through the modified ethylene composite copolymer and the modified chitosan, a uniform net structure is formed in a cross-linking reaction to serve as a supporting framework, the overall mechanical structure performance is enhanced through the bamboo fibers which are synergistically and uniformly distributed in the composition formula, and the degradable and non-toxic effects are achieved through the cooperation of the bamboo fibers and the TPS.

The invention is directed to an aqueous binder composition for mineral wool fibres made of a mixture of I) a phenol-urea-formaldehyde binder (PUF binder), and II) a carbohydrate binder comprising a component (a) in the form of one or more carbohydrates and a component (b) in the form of: (bi) one or more compounds selected from sulfamic acid, derivatives of sulfamic acid or any salt thereof, wherein component (a) is present in an amount of at least 20 % by weight based on the binder component solids. The aqueous binder composition is suitable for producing a mineral fibre product by contacting mineral fibres with the aqueous binder composition and curing the binder.

The invention relates to a high-performance reactive asphalt cold patch mixture and a preparation process thereof. The mixture comprises a sulfonated fatty acid diluent, a graded aggregate, an atomic layer deposition (ALD) modified basalt aggregate and a solid waste-based composite curing agent. The sulfonated fatty acid diluent is prepared by sulfonating oleic acid, linoleic acid and palmitic acid through sulfamic acid, the sulfonation degree is 15-20%, and the sulfonated fatty acid diluent contains an epoxy three-membered ring structure; the 3-5mm aggregate is used as a transition layer to block the caking path of the fine aggregate; the basalt aggregate is subjected to TDMAT and TMA alternate deposition to form a Ti < x > Al < gamma > O < 2 > nano film; the curing agent comprises calcium strontium sulphoaluminate minerals, a titanium gypsum-carbide slag compound and magnesium-loaded lithium slag. During preparation, the modified aggregate, the sulfonated diluent and the curing agent are mixed at normal temperature. The problems that a traditional cold repairing material is poor in low-temperature fluidity and weak in interface bonding are solved, the viscosity at-20 DEG C is smaller than or equal to 450 mPa.s, the 7-day strength is larger than or equal to 5.2 kN, and the cold repairing material is suitable for low-temperature emergency repairing.

The invention discloses a polyampholyte chitosan with high polymerization degree and water solubility and a preparation method thereof, and belongs to the field of natural polymer material preparation. The polyampholyte chitosan is prepared by mixing aminosulfonic acid and one or more of glycerol, urea, lactic acid or choline chloride as a low eutectic solvent, and then adding chitosan for modification, and contains a polyampholyte of cationic groups and anionic groups. The chitosan sulfate product prepared by the invention has a small molecular weight loss, controllable modification sites, and can obtain a polyampholyte chitosan with high polymerization degree; the sulfation reaction has high efficiency, few side reactions, high product purity, good product water solubility, and extremely high application value.

The invention belongs to the technical field of CT imaging, and relates to a bismuth-based imaging contrast agent and a preparation method thereof. The bismuth-based imaging contrast agent is formed by chelating diethylenetriamine pentaacetic acid (DTPA) modified by sulfamic acid with bismuth ions and then connecting an antibody to the surface. The preparation method comprises the following steps: carrying out first reaction on DTPA and sulfamic acid in the presence of an activating agent to obtain sulfamic acid modified DTPA; carrying out a second reaction with an inorganic bismuth salt in a second solvent, then adjusting the pH value to be neutral, and drying to obtain aminosulfonic acid modified DTPA chelated bismuth ions; and carrying out third reaction on the DTPA chelated bismuth ions modified by sulfamic acid and an antibody, and drying to obtain the product. The CT imaging contrast agent has excellent CT imaging capability, high safety and tumor cell killing capability.

The invention belongs to the technical field of oil exploitation, and particularly relates to a foaming agent for nitrogen foam well cementation and a preparation method thereof. The preparation method comprises the following steps: adding tris (hydroxymethyl) aminomethane, ethanol and dodecyl halide into a reactor, uniformly stirring, heating, carrying out a heat preservation reaction, and adjusting the pH value; adding benzyl halide into the reactor, uniformly stirring, heating, preserving heat and reacting, and adjusting the pH value; carrying out reduced pressure distillation to obtain a viscous liquid, adding toluene for dissolving, transferring into a high-pressure reaction kettle, adding a catalyst, closing the reaction kettle, stirring, heating, vacuumizing, introducing ethylene oxide, heating after the introduction is completed, stopping heating when the pressure does not drop any more, and cooling the system; adjusting the pH value, adding sulfamic acid powder, heating while stirring, carrying out heat preservation reaction, and cooling; and filtering and carrying out reduced pressure distillation to obtain a viscous solid, namely the foaming agent product for well cementation. The foaming agent for well cementation has the advantages of large foaming volume and long half-life period.

The invention discloses a method for extracting copper fine powder by flotation of copper-containing ore, which belongs to the technical field of mineral processing, and comprises the following steps: after copper-containing raw ore is crushed, ground and classified by a cyclone, overflow enters flotation, and settled sand is returned for regrinding; sodium carbonate is added into graded overflow to adjust the pH, a sodium hexametaphosphate-polyacrylamide composite dispersant is added, and copper sulfate is added and stirred after low-temperature microwave heating; gradient flotation is conducted, specifically, copper sulfide is roughly selected, the pH is adjusted, an amino-sulfonic acid group synergistic modified layered double metal hydroxide / cobalt ferrite composite collecting agent is added, and rough concentrate 1 is obtained through high-frequency pulse air inflation flotation; copper oxide roughing is conducted, clear water is supplemented to adjust the pH, and a collecting agent is supplemented to obtain rough concentrate 2; scavenging is performed for three times, a collecting agent is added for flotation, and concentrate returns to the previous stage; the rough concentrates are combined, and magnetic impurities are removed through high-gradient magnetic separation to obtain magnetic concentrates; and carrying out microbiological leaching on tailings to recover copper. The composite collecting agent is prepared through layered double hydroxide carrier synthesis, amino modification, sulfonic acid group grafting and cobalt ferrite anchoring.

A positive electrode for a secondary battery including a positive electrode current collector, and a positive electrode active material layer supported on the positive electrode current collector. The positive electrode active material layer contains active material particles, a binder, and a thermal decomposable additive. The thermal decomposable additive includes a sulfamic acid. The binder includes at least one selected from the group consisting of a fluorocarbon resin and a hydrogenated nitrile butadiene rubber.

The invention discloses a preparation method of high-purity bis (fluorosulfonyl) imide alkali metal salt. The method comprises the following steps: (1) synthesizing bis (chlorosulfonic acid) imide by taking sulfamic acid, chlorosulfonic acid, thionyl chloride and chlorosulfonic acid isocyanate as raw materials; (2) fluorinating the bis (chlorosulfonic acid) imide by ammonium fluoride to obtain bis (fluorosulfonyl) imide ammonium salt; (3) treating the imidodisulfuryl fluoride ammonium salt solution with a strong acid ion exchange column and concentrating under reduced pressure to obtain imidodisulfuryl fluoride; (4) reacting the alkali metal salt with bis (fluorosulfonyl) imide to obtain bis (fluorosulfonyl) imide alkali metal salt; and (5) carrying out a series of purification processes on the bis (fluorosulfonyl) imide alkali metal salt to obtain the high-purity bis (fluorosulfonyl) imide alkali metal salt. The preparation method has the advantages of mild reaction conditions, low danger coefficient in the technological process, easiness in control, no use and generation of corrosive acid, greenness and environmental protection, and high yield and high purity of the bis (fluorosulfonyl) imide alkali metal salt, and is suitable for large-scale industrial application.

The present invention relates to a solid hard surface cleaning composition comprising: a. a biocidal quaternary ammonium compound; b. an anionic surfactant comprising alkyl sulfate; and c. an effervescence base comprising a carbonate salt and an acid; wherein, • the weight ratio of biocidal quaternary ammonium compound to anionic surfactant is from 1.5:1 to 7:1; • at least 50 wt% of the total amount of acid present in the cleaning composition is sulfamic acid calculated on total amount of acid present in the cleaning composition; • the cleaning composition comprises from 0 to 1 wt% water; and • 25 grams of the cleaning composition dissolved in 1.5 litres of water of 20° Celsius provides an aqueous solution with a pH of 1.5 to 4.5. The invention further relates to a method of cleaning the inside surface of a toilet bowl using the composition of the present invention.

The invention belongs to the technical field of oil exploitation, and relates to a drag reducer for fracturing and a preparation method thereof. The preparation method comprises the following steps: adding 1, 5-hexadiene-3, 4-diol and a catalyst into a high-pressure reactor, raising the temperature, introducing ethylene oxide, raising the temperature, carrying out a heat preservation reaction, stopping heating, and cooling to 50 DEG C or below; adjusting the pH value to 2-3 by using phosphoric acid, adding sulfamic acid, heating, preserving heat and reacting, and cooling to below 40 DEG C; the preparation method comprises the following steps: adding deionized water, 2-(trifluoromethyl) acrylic acid and methacryloylethyl sulphobetaine, stirring and dissolving, adjusting the pH value to 7-8, adding an initiator, heating and carrying out a heat preservation reaction to obtain a viscous liquid; and settling, centrifuging, cleaning and drying to obtain the product drag reducer. The drag reducer has the characteristics of high viscosity and high drag reduction rate.

The present disclosure provides anionic citrate-based composition for use in regenerative applications. The disclosed composition may take the form of a scaffold and generally includes (i) a citrate component, (ii) a diol, and (iii) an anionic moiety. The anionic moiety may include one or more of a sulfate, sulfonate, phosphate, phosphonate, sulfamate, or carboxylic acid, The sulfate and / or sulfonate containing moiety may be conjugated via an amidation reaction, esterification, and / or substitution reaction with a sulfur trioxide complex. A peptide may be conjugated to a surface of the composition.

The present invention discloses aramid insulation paper, a preparation method, and applications, relating to the technical field of aramid paper. The present invention utilizes cellulose treated with a treatment agent A and aminosulfonic acid in combination with meta-aramid chopped fibers treated with the treatment agent A to produce aramid insulation paper with excellent mechanical properties and resistance to high-frequency partial discharge and high temperatures.

The invention provides a rubidium and cesium adsorbent and a preparation method and application thereof. The preparation method comprises the following steps: providing a doped and modified Prussian blue analogue, wherein the Prussian blue analogue comprises a Prussian blue matrix material and a transition metal doping element doped in the Prussian blue matrix material; granulating a mixed material containing the doped and modified prussian blue analogue and a granulating agent to obtain a rubidium and cesium adsorbent precursor; a mixed reaction system containing the rubidium and cesium adsorbent precursor and a surface modifier are subjected to a reaction, the surface modifier contains one or more functional structures of an amino group, a sulfonic group, a carboxyl group, a sulfydryl group, an acryloyloxy group, an epoxy group, a crown ether structure and a calixarene structure, and therefore the rubidium and cesium adsorbent is obtained. Through a multi-aspect synergistic strategy of transition metal doping, granulation and surface modification, the prepared rubidium and cesium adsorbent has good stability and high adsorption capacity, and has strong selectivity to Cs < + > / Rb < + >.

The invention discloses a ceramic filter plate cleaning agent and a preparation method thereof, the ceramic filter plate cleaning agent comprises 10%-20% of citric acid, 10%-20% of sulfamic acid, 10%-20% of HEDP, 10%-20% of EDTA, 10%-20% of a corrosion inhibitor, 10%-20% of AEO-9, 10%-20% of JFC and the balance of ultrapure deionized water. 2%-4% of sulfamic acid; 2%-5% of HEDP; 0.5%-2.5% of EDTA (Ethylene Diamine 0.1%-0.5% of a corrosion inhibitor; 1%-3% of AEO-9; 1%-3% of JFC; the AEO-9 is a nonionic surfactant, the sulfamic acid is inorganic solid acid formed by replacing hydroxyl of sulfuric acid with amino, the HEDP is an organic phosphonic acid scale and corrosion inhibitor, the EDTA is a powerful chelating agent, the corrosion inhibitor is benzotriazole, and the JFC is a penetrant auxiliary agent. The cleaning agent can effectively remove various dirt and impurities including organic pollutants, metal oxides, mineral particles and the like on the surface of the ceramic filter plate, does not corrode the ceramic filter plate, has good environmental protection performance, does not generate harmful gas, and is simple and feasible in cleaning process.

The invention provides a preparation method of ethylene carbonate and ethylene sulfate, which comprises the following steps: 1) by taking vinylethylene carbonate as a raw material, carrying out oxidation reaction with an oxidant to obtain epoxy ethylene carbonate as shown in a formula I; and 2) carrying out heating reaction on the epoxy ethylene carbonate as shown in the formula I obtained in the step 1) and sulfamic acid in an acidic solvent to obtain ethylene carbonate disulfate as shown in a formula II. The method avoids the problem of poor reaction selectivity caused by using butantetraol as a raw material in the prior art; according to the method disclosed by the invention, an intermediate butantetraol carbonate is not generated, so that the problem that the intermediate further reacts to generate a byproduct 2, 4, 7-trioxa-3-oxy-bicyclo [3.3. 0] octane does not exist; in addition, when the final product sulfate is synthesized, mild and non-irritant sulfamic acid is used, and the method has the advantages of being clean, green and environmentally friendly.

The invention belongs to the technical field of preparation of sulfamic acid, and particularly relates to high-purity sulfamic acid production equipment and a sulfamic acid synthesis process. Comprising a sulfonation kettle, a feeding pipe is fixedly connected to one side of the sulfonation kettle, an exhaust pipe is fixedly connected to the other side of the sulfonation kettle, a discharging pipe is fixedly connected to the bottom end of the sulfonation kettle, a motor is fixedly installed on one side of the top of the sulfonation kettle, and a first rotating shaft is rotationally connected to the center of the top of the sulfonation kettle; the first rotating shaft is in transmission connection with the output end of the motor through a belt, an annular partition plate is arranged in an inner cavity of the sulfonation kettle, and a plurality of supporting legs are arranged at the bottom end of the annular partition plate. The space in the sulfonation kettle can be divided into the inner side and the outer side through the annular heat conduction plate arranged in the sulfonation kettle, and the jacket heating unit arranged in the sulfonation kettle shell is matched, so that it is effectively ensured that heat is evenly transmitted to a reaction medium, and the local overheating or supercooling phenomenon is reduced.

The invention relates to a production method of imidodisulfuryl fluoride and a production method of lithium imidodisulfuryl fluoride, the production method of imidodisulfuryl fluoride takes sulfamic acid, chlorosulfonic acid and thionyl chloride as raw materials, imidodisulfuryl fluoride is obtained through chlorination reaction, imidodisulfuryl fluoride and hydrofluoric acid or imidodisulfuryl fluoride and hydrogen fluoride gas are taken as raw materials, imidodisulfuryl fluoride and hydrogen fluoride gas are subjected to chlorination reaction to obtain imidodisulfuryl fluoride. The invention discloses a method for producing bis (fluorosulfonyl) imide, which comprises the following steps: by taking bis (fluorosulfonyl) imide as a raw material, carrying out fluoridation reaction to prepare a bis (fluorosulfonyl) imide crude product, adding metal salt into the bis (fluorosulfonyl) imide crude product, and then carrying out melt crystallization and / or rectification. According to the method, the metal salt is added into the difluorosulfonyl imide crude product, so that the metal salt can react with a light component in a fluorination reaction system or a component with a boiling point similar to that of the target product difluorosulfonyl imide, and the impurities react to generate salt with a relatively high boiling point; therefore, the components can be separated from the target product imidodisulfuryl fluoride in the subsequent purification process, and the purity of imidodisulfuryl fluoride is further improved.