30 results about "Free acid" patented technology

The application discloses a method for rapidly and harmlessly treating phosphogypsum, and particularly relates to the harmless treatment technical field of industrial solid waste. The method comprises the following steps: mixing raw materials with an alkaline neutralizing agent, a trapping agent and an activating agent, adding a phosphorus solidifying agent and a fluorine solidifying agent, mixing, carbonizing and aging, and obtaining harmless phosphogypsum. The method adopts the alkaline neutralizing agent to rapidly neutralize free acid and improve the pH of the system; the trapping agent adsorbs heavy metals; the activating agent promotes As, Cd and the like to form a difficult-to-dissolve iron oxide gel or a precipitate; the phosphorus solidifying agent and the fluorine solidifying agent perform deep chemical precipitation to form a stable iron-calcium-phosphate / ferric fluoride composite solidified body. The functions of the agents are clear, and the agents have synergistic effects; the solidification effect of the agents on high water-solubility phosphorus, fluorine and various heavy metals is far better than that of a single or simply compounded agent system; and the leaching concentration can be reduced to a level far lower than the national standard.

This utility model relates to the field of ammonium sulfate post-treatment technology in ammonia desulfurization, and discloses a free acid neutralization device for ammonium sulfate by-products of ammonia desulfurization. The device includes a hydrocyclone, centrifuge, neutralizing agent silo, metering feeder, feeding screw, dryer, dust removal equipment, and finished product storage silo. This free acid neutralization device for ammonium sulfate by-products of ammonia desulfurization, by setting up a neutralizing agent silo and a metering feeder, utilizes the post-treatment system equipment of the ammonia desulfurization unit to achieve compliant production of free acid from the by-product ammonium sulfate. It features a simple process, low equipment investment, negligible operating costs, low failure rate, and high safety and reliability.

This invention provides an antibacterial and antifungal TPE material, belonging to the field of thermoplastic elastomer technology. The antibacterial and antifungal TPE material of this invention comprises the following components: SEBS, PP, a plasticizer, modified nano-zinc oxide, N-n-butyl-1,2-benzisothiazolin-3-one, 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, an antioxidant, and zinc stearate; wherein the modified nano-zinc oxide is obtained by melt blending nano-zinc oxide with maleic anhydride-grafted SEBS, the mass ratio of the modified nano-zinc oxide to the maleic anhydride-grafted SEBS is (0.6-1.7):1, and the particle size of the nano-zinc oxide is 20-50 nm; the free acid content of the zinc stearate is 0.3%-0.5%. The antibacterial and antifungal TPE material of this invention possesses good antibacterial properties, antifungal properties, and tensile strength.

This invention relates to the field of fertilizer production technology, specifically to a segmented ripening preparation process for low-free-acid, high-water-soluble superphosphate; the process includes the following steps: feeding phosphate rock powder into a ball mill for grinding to a particle size ≤120 mesh, preparing 93%±0.5% industrial sulfuric acid; adding phosphate rock powder at a molar ratio of available P2O5 to sulfuric acid of 1:1.05~1:1.07, adding 0.3%~0.5% (by weight of phosphate rock powder) of a modifying agent, and reacting at 65~70℃ for 40~50 minutes. In the later stage of the reaction, low-pressure steam of 0.2 MPa is introduced; staged maturation is carried out, first in a closed chamber at 55~60℃ for 24 hours, and then in a ventilated chamber at 45~50℃ and a wind speed of 0.8~1.0 m / s for 48 hours; granulation and screening are carried out, with the granulation drum rotating at 14~16 r / min and tilted at an angle of 3°~5°; through the above methods, the problems of high free acid, low proportion of water-soluble phosphorus and insufficient production efficiency in traditional processes are solved, and the product quality and production capacity are synergistically improved.

The application provides a preparation method of MK-0616 south fragment, and relates to the technical field of polypeptide synthesis. The preparation method comprises the following steps: condensation reaction of alkyl primary alcohol 17 and protected amino acid 2 to obtain intermediate 18; deprotection reaction of the intermediate 18 to obtain intermediate 19; condensation reaction of the intermediate 19 and compound 4 to obtain intermediate 20; deprotection reaction of the intermediate 20 to obtain intermediate 21; condensation reaction of the intermediate 21 and compound 10 to obtain intermediate 22; deprotection reaction of the intermediate 22 to obtain intermediate 23; condensation reaction of the intermediate 23 and compound 14 to obtain intermediate 24; hydrolysis reaction of the intermediate 24 to obtain a crude product of MK-0616 south fragment; salt crystallization of the crude product of MK-0616 south fragment to obtain intermediate 15; and free acidization of the intermediate 15 to obtain a pure product of MK-0616 south fragment.

The application discloses a driver special anti-drowsy spicy water and a preparation method and application thereof, and relates to the technical field of functional drinks.The raw material components of the spicy water include aged old-lake sour water, self-made iodine-free acid salt water, pepper extract and trace chicken essence;the self-made iodine-free acid salt water is prepared by mixing 92 parts of drinking water and 8 parts of iodine-free salt by weight;the salt content of the finished product is 0.5%-0.8%, the pH value is 3.0-3.6, and the spiciness of the pepper extract is 10000-40000 SHU.The application further discloses a preparation method of the spicy water and an anti-slip light-proof glass bottle packaging structure specially designed for drivers.The natural sour and spicy synergistic stimulation of the aged old-lake sour water and the pepper extract can effectively inhibit the drowsiness of drivers, relieve fatigue driving, and keep the drivers awake for more than 30 minutes after single drinking;the application is suitable for long-distance drivers, and has a remarkable anti-drowsy effect and good driving scene adaptability.

This application provides a continuous titration method for the sulfuric acid and ammonium nitrate content of silicon etching solution. The continuous titration method includes the following steps: weigh m grams of silicon etching solution sample into a sample bottle, add phenolphthalein indicator, titrate with a first sodium hydroxide standard solution of concentration C1 until a pink color is achieved, and record the volume consumed V1. Calculate the sulfuric acid content. Add neutral formaldehyde solution to the same solution and let it stand for a first preset time to generate a free acid solution. Continue titrating the free acid solution with a second sodium hydroxide standard solution of concentration C2 until the solution turns pink. Gently heat the solution to a preset temperature and maintain this temperature for a second preset time. If the pink color persists, the titration endpoint is determined, and the volume consumed V2 is recorded. Calculate the ammonium nitrate content. This method achieves continuous titration of two components with a single sample, eliminates mutual interference between components, optimizes the endpoint determination method, and thus achieves a simple operation, high accuracy, low sample consumption, and high detection efficiency.

This invention discloses an ultra-thin, tensile-reinforced packaging film, relating to the field of agricultural packaging film technology. The film has a seven-layer co-extruded structure with a total thickness of 15–22 micrometers. It comprises an outer surface unwinding weather-resistant layer, an inner surface adhesive layer, a core layer with pinhole self-sealing in the middle, and tensile-reinforced crack-blocking layers on both sides. The core layer contains a polyisobutylene sealing phase, a dynamic ionic framework composed of a blend of sodium and zinc ionomers and unneutralized ethylene-acid copolymer, and a compatibilizer containing epoxy-based ethylene copolymers. The molar ratio of epoxy to free acid groups is 0.05–0.25, resulting in polyisobutylene forming a sealing microdomain with a median particle size of 0.3–1.2 micrometers and 90% of the particles having a diameter no greater than 2.5 micrometers. The blocking layer contains a microfibrillated reinforcing phase. Under pre-tension, the film can quickly seal pinholes and reduce oxygen intrusion, while simultaneously inhibiting the migration of the sealing phase, reducing in-roll adhesion and downtime for repairs.

The application discloses a preparation method of a low-sodium high-activity copper-based methanol synthesis catalyst, which comprises the following steps: configuring a mixed solution (1) of Cu(NO3)2 and Zn(NO3)2; configuring a mixed solution (2) of Cu(NO3)2, Zn(NO3)2 and Zr(NO3)4; removing free acid in the mixed solutions (1) and (2); configuring an alkaline precipitant solution (3) and mixing the alkaline precipitant solution (3) with the copper-zinc mixed solution (1) to obtain a precipitate binary matrix precursor; simultaneously pumping the mixed solution (2) and the alkaline precipitant solution (3) into the washed precipitate to obtain a binary matrix; washing the solution after removing excessive impurities to obtain a catalyst matrix; adding a low-sodium alumina carrier, and performing washing, filtration, drying, calcination and the like to obtain a catalyst precursor; and performing washing, drying and shaping on the catalyst precursor to obtain a finished product. The methanol synthesis catalyst prepared by the method has lower impurity sodium content, high activity, better selectivity and better physicochemical properties, and is suitable for synthesizing methanol from a synthesis gas containing CO, CO2 and H2, and is especially suitable for a low-temperature and low-pressure methanol synthesis device.

A foodstuff can include a free acid β-hydroxybutyrate, and a base. The β-hydroxybutyrate, and base, are present at a less than 1:1 molar equivalence. Ketone Ester may also be incorporated as a component of the foodstuff.

This invention discloses a narrow-distribution functionalized aqueous latex and its preparation method, belonging to the field of aqueous latex preparation technology. The latex uses functionalized monomers, aromatic vinyl monomers, and aliphatic conjugated diene monomers as main raw materials, introduces silane coupling agent-modified cellulose nanocrystals, and combines them with an initiator, emulsifier, and water, undergoing one-step emulsion polymerization. The modified cellulose nanocrystals can form a physical barrier on the surface of the latex particles, reducing the content of embedded acid and free acid in the aqueous phase, and increasing the surface carboxyl group density; its rigid structure forms a three-dimensional network after film formation, effectively suppressing the volume expansion of the silicon anode. The resulting latex has a particle size of 245~255nm, a narrow particle size distribution, moderate viscosity, and high bonding strength. When used as a lithium battery anode binder, it exhibits high electrode peel strength, good slurry dispersibility, and excellent battery cycle stability. This invention features a simple process, readily available raw materials, and easy industrial scale-up, making it suitable for lithium battery anode binders, paper coating, and aqueous adhesives.

Provided herein, in some embodiments, are solid-state forms of a compound represented by Formula (I), as free acid or base, or a pharmaceutically acceptable salt or solvate thereof, pharmaceutical compositions comprising one or more solid-state forms of a compound represented by Formula (I), as free acid or base, or a pharmaceutically acceptable salt or solvate thereof, and methods of use thereof.

The application belongs to a preparation method of a casting sand mold, and aims at the technical problems that liquid acidic curing agent is easy to volatilize, sensitive to environmental humidity, and insufficient in uniform mixing with sand particles and resin in the existing furan resin sand mold preparation process, and that the content of free formaldehyde and odor of traditional furan resin are relatively high, resulting in insufficient curing uniformity and insufficient stability of the forming strength of the sand mold, and provides a dry-state curing agent coated casting sand mold and a preparation method thereof, which comprises the following steps: preparing an environmentally-friendly modified furan resin; compounding calcium hydrogen phosphate, ammonium p-toluenesulfonate and ammonium oxalate into an acidic dry-state powdery curing agent with a free acid content of 0; adding the curing agent into refractory aggregate or raw sand for high-speed dry-state mixing and coating to obtain dry-state curing agent coated aggregate; and then adding the environmentally-friendly modified furan resin, stirring and mixing, molding and naturally hardening to form a casting sand mold. The method can improve the forming stability and compressive strength of the casting sand mold, and reduce the influence of free formaldehyde, free acid and odor.

The application provides a method and device for purifying acid regeneration flue gas emission, comprising the following steps: injecting hydrochloric acid solution into a ferrous chloride washing tower of an acid regeneration unit, mixing with circulating liquid in the tower to adjust the concentration of free acid in the circulating liquid, and obtaining circulating liquid containing free acid; delivering the circulating liquid containing free acid to a pre-concentrator for dissolving scale at the throat of the pre-concentrator or inhibiting the scale from growing at the throat; before switching the running state of the acid regeneration unit, supplementing the acid solution into the ferrous chloride washing tower to maintain the acidic environment in the washing tower, and achieving the purpose of purifying flue gas. The method and device are simple and convenient to operate, do not need to add large equipment or complex facilities, can be directly implemented by relying on the existing flue gas treatment equipment for optimization, have strong process compatibility, can realize closed-loop automatic control, reduce the manual operation and maintenance intensity, and have a good industrial application prospect.

The application discloses a positive pole piece, a preparation method thereof, and a secondary battery. The positive pole piece comprises a current collector and a positive active layer coated on the surface of the current collector. The positive active layer comprises a positive active material, a conductive agent, a binder, a lithium supplement agent, and an acidic solution. The mass percentage of the lithium supplement agent is 0.5% to 10% based on the total mass of the positive active layer, and the mass percentage of the acidic solution is 0.03% to 1%. The lithium supplement agent and the acidic solution are simultaneously introduced into the positive active layer. The addition amount of the lithium supplement agent, the addition amount of the acidic solution, the stoichiometric number of Li in the molecular formula of the lithium supplement agent, and the pH value of the positive pole piece are quantitatively matched according to a specific relationship formula. The acidic solution and the residual alkali on the surface of the lithium supplement agent are reacted in a slurry at a stoichiometric ratio. The residual alkali is effectively consumed, and no free acid is left in the pole piece. The pH value of the positive pole piece is maintained in a near-neutral range, and the processability and the electrochemical performance of the positive pole piece are considered.

This invention discloses an electrolyte suitable for electric double-layer capacitors, its preparation method, and its application, belonging to the field of electrochemical energy storage technology. The electrolyte comprises an organic solvent, an electrolyte salt, and additives, wherein the additives are fluorinated acrylate additives. The electrolyte of this invention, applied to 2.5~2.8V electric double-layer capacitors, can suppress hydrolysis gas generation and electrode micropore blockage induced by trace amounts of moisture under high-temperature float charging through the synergistic effects of ion solvation sheath reconstruction, interface property regulation, and steric hindrance polymerization. This results in a reduction of more than half in cell volume expansion, a reduction of more than 27.9% in internal resistance increase, an improvement of capacity retention of more than 6.4%, and a reduction of more than 59.7% in electrolyte free acid content after 8 weeks of float charging at 65℃ and 2.9V. Furthermore, only trace amounts are needed to significantly extend the high-temperature service life of the cell without sacrificing the initial conductivity and capacity of the electrolyte, greatly improving the high-temperature degradation problem of existing AN-based electric double-layer capacitors.

A foodstuff can include a free acid β-hydroxybutyrate, and a base. The β-hydroxybutyrate, and base, are present at a less than 1:1 molar equivalence. Ketone Ester may also be incorporated as a component of the foodstuff.

This invention discloses a polymeric aluminum iron silicate and its preparation method, belonging to the field of water treatment technology. The method utilizes the mother liquor generated during the production of sodium fluorosilicate from fluorine-containing waste acid, comprising the following steps: S1: Adding acid to the mother liquor, stirring to produce a precipitate, filtering, washing, and drying the precipitate to obtain silicic acid, then adding alkali to react with the silicic acid for 1.8-2.2 hours to obtain a sodium silicate solution; S2: Adding an oxidant to steel pickling waste liquid containing ferrous ions and free acid, stirring to obtain polyferric chloride; S3: Mixing the sodium silicate solution obtained in step S1, the polyferric chloride obtained in step S2, polyaluminum chloride, and a stabilizer, and aging to form polymeric aluminum iron silicate. This invention utilizes waste materials, and the resulting polymeric aluminum iron silicate exhibits good stability.

The polarizing element of the present application contains an azo compound represented by the following formula (1) or a salt thereof, or an azo compound represented by the following formula (2) or a salt thereof, and an azo compound represented by the following formula (3) or a salt thereof, in the form of a free acid.

This invention discloses a parallel material cleaning machine and cleaning method, relating to the field of silicon wafer cleaning. It includes a cleaning table, a first drive beam, a cleaning frame, a receiving box, and a cleaning mechanism. The cleaning mechanism is used to clean the cleaning frame and silicon wafers at the receiving position of the receiving box to remove residual liquid. By setting up the receiving box and cleaning mechanism between degreasing and pickling, residual degreasing agent, saponified substances, and grease on the workpiece surface are removed, eliminating the triple hazards of neutralization failure, salt contamination, and uncontrolled foaming caused by alkaline substances mixing into the pickling tank, ensuring stable free acidity of the pickling solution. This invention, by setting up the receiving box and cleaning mechanism between pickling and passivation, not only rinses the surface acid solution but also neutralizes residual acid radicals through the penetration of a neutralizing agent into the micropores, and removes calcium and magnesium ions with deionized water, completely avoiding the contamination of acid and Fe²⁺. + Cl ‑ SO4² ‑ By allowing pollutants to enter the phosphating tank, problems such as system collapse, membrane failure, and excessive sludge accumulation can be prevented.

A method for preparing cis-2-alkenyl acid or its alkali metal salt, comprising rearranging 1,3-dibromo-2-alkenone in an alkaline environment in the presence of a catalytically effective amount of the cis-2-alkenyl acid alkali metal salt, and separating the cis-2-alkenyl acid in free acid form or alkali metal salt form from the reaction mixture.

This invention relates to the field of wet electronic chemicals technology and discloses a neutral metal cleaning agent for photomasks and its preparation method, comprising: 1.8% to 2.2% free acidic phytic acid, 0.55% to 0.75% ethoxylated acetylenic glycol with a specific EO addition number (3.5), a choline hydroxide-acetic acid buffer pair to maintain a neutral environment, and ultrapure water. This invention utilizes a geometrically complementary anti-dilution desorption adsorption layer formed on the metal surface by phytic acid and ethoxylated acetylenic glycol at a specific mass ratio (2.8:1-3.2:1). This layer maintains a negative Zeta potential and provides steric hindrance during the non-equilibrium process of ultrapure water rinsing, blocking the reverse pinning of submicron particles. This adsorption layer can inhibit intergranular corrosion and pitting on the metal surface, achieving non-destructive cleaning of precision patterns.

To overcome the technical problem that existing methods for preparing LiPF6 using PF5 inevitably introduce HF and SO3, increasing the free acid content of LiPF6, this invention provides a method for preparing hexafluorophosphate, comprising the following steps: uniformly mixing a first organic solvent with an alkali metal fluoride salt, passing phosphorus pentafluoride through the mixture to react and obtain crude hexafluorophosphate; mixing the crude hexafluorophosphate with an amine-containing polymer to remove acidic impurities; and then performing post-treatment to obtain the final hexafluorophosphate. The method for preparing hexafluorophosphate provided in this application uses an amine-containing polymer to remove acidic impurities from the crude hexafluorophosphate, improving the purity of the hexafluorophosphate; the amine-containing polymer can desorb and release acidic substances such as HF and SO3, allowing for reuse and reducing production costs.

The application relates to the technical field of potassium sulfate and discloses a process for improving the production stability of potassium sulfate, which comprises the following steps: introducing potassium chloride and concentrated sulfuric acid into a reaction furnace, segmentally regulating the furnace temperature of the reaction furnace, reacting, cooling, scraping, screening and crushing to obtain potassium sulfate finished products. Through systematic research, the optimal process parameters of the preparation of potassium sulfate by the Mannheim method are successfully determined, the optimal temperature at the top of the furnace is 730 DEG C, the optimal reaction temperature in the furnace is 530 DEG C, the potassium oxide K2O content is stably kept at about 52%, the chloride ion Cl ‑ content is reduced to 1.36% and 2.38% respectively, meanwhile, the feeding flow of the concentrated sulfuric acid is 70.5%, the potassium oxide content can be up to 52.4% at most, and the impurity content is low, which is a key operation point for realizing complete reaction and obtaining high-purity products.

The application discloses a purification method for preparing polymer-grade lactide from crude lactide and belongs to the field of lactide purification. The application relates to application of an aziridine compound as a lactide free acid removal aid. In addition, the application also relates to a method for reducing the free acid content of lactide, which comprises the following steps: mixing and reacting lactide with an aziridine compound. Specifically, the aziridine compound is used as a reaction aid to mix and react with crude lactide, and vacuum distillation is adopted to obtain polymer-grade lactide with low free acid content.

The present disclosure relates to a method for simultaneously recycling and treating aluminum mud and titanium white waste liquid, which utilizes the aluminum oxide in the aluminum mud to neutralize free acid in the waste liquid and release aluminum ions, and then induces Al 3+ , Fe 3+ , Ti 4+ to preferentially hydrolyze to form composite flocs, captures a large number of metal ions by using the composite flocs to achieve synergistic co-precipitation, thereby completing the purification of the titanium white waste liquid and the resource utilization of the two hazardous wastes.

This invention discloses an additive for tin plating solution and its preparation method. The additive, based on the total volume of the tin plating solution, comprises the following components at the following concentrations: tin methanesulfonate: 100-400 mL / L; methanesulfonic acid: 30-180 mL / L; brightener A: 5-50 mg / L; auxiliary brightener B: 0.5-8 mL / L; auxiliary brightener C: 0.5-100 mg / L; stabilizer D: 2-35 g / L; dispersant E: 0.5-8 g / L; wetting agent F: 1-15 mL / L; balance: deionized water corresponding to 1 L of volume. The volume of methanesulfonic acid added is 0.8 to 1.2 times the volume of tin methanesulfonate added. The tin plating solution additive provided by this invention has a methanesulfonic acid addition volume that is 0.8 to 1.2 times the volume of tin methanesulfonate addition. This allows for precise control of the plating solution's acidity balance, maintaining the free acid concentration within the optimal range. Furthermore, it completely eliminates high-environmental-risk and high-biotoxicity components such as formaldehyde and halogenated phenols, and selects low-toxicity, easily degradable nitrogen-containing heterocyclic compounds, alkynols, high-molecular-weight amines, and environmentally friendly phenolic antioxidants. It poses no ecological pollution risks and fully meets the requirements of green electroplating production.

The application discloses a kind of purification methods of acidless semiconductor grade quartz sand, belong to material purification field.This method is prepared semiconductor grade quartz sand by raw material pretreatment, acidless complex scrubbing, neutral fluoride-free acid reverse flotation, gradient chlorination roasting whole-process procedure, core uses hydroxypropyl oxidized starch as quartz inhibitor, amino polycarboxy compound and sulfobutyric acid methyl ester sodium compound amphoteric collector of compounding, realize the efficient separation of quartz and gangue mineral under the neutral condition of pH6.5~7.5.The application does not use hydrofluoric acid, sulfuric acid and other strong acid throughout, realizes the efficient purification of quartz sand by the synergistic effect of physical and chemical methods, product purity can reach more than 99.9992%, meet the requirement of semiconductor grade, and environment-friendly, process safety.

Disclosed is a self-invertible inverse latex comprising an aqueous phase containing: a) a crosslinked anionic polyelectrolyte (P) including:—at least one first monomer unit derived from 2-methyl-2-[(1-oxo-2-propenyl) amino] 1-propanesulfonic acid in the form of a free or partially or totally salified acid;—at least one second monomer unit derived from at least one monomer selected from the elements of the group consisting of acrylic acid, methacrylic acid, 2-carboxyethyl acrylic acid, itaconic acid, maleic acid, 3-methyl 3-[(1-oxo-2-propenyl) amino] butanoic acid, the carboxylic function of said monomers being in the free, partially salified or totally salified acid form; and—at least one third monomer unit derived from a polyethylenic crosslinking monomer (AR); b) ethylenediamine disuccinic acid in the form of trisodium salt.

The application provides a surface passivation method for nanocrystalline soft magnetic powder, and belongs to the technical field of surface treatment of magnetic materials.The surface passivation method comprises the following steps: preparing a water-based passivation solution, dispersing nanocrystalline soft magnetic powder in the water-based passivation solution, regulating the free acid concentration in the water-based passivation solution to be 0.03-0.05 mol / L, making the nanocrystalline soft magnetic powder undergo a passivation reaction, and obtaining the passivated nanocrystalline soft magnetic powder after dehydration.The surface passivation of the nanocrystalline soft magnetic powder is realized by one-step method, the process is simple, the corrosion-resistant component of the nanocrystalline powder is used as a basis, a specific passivation agent system is selected, the reaction conditions with the water-based medium are accurately matched, a balanced process window in which the passivation agent can effectively react to form a film and the oxidation of water can be inhibited to the minimum is constructed, and finally a thin and dense high-quality passivation layer with strong adhesion is formed on the surface of the nanocrystalline soft magnetic powder.