40 results about "Hydrogen-Ion Concentrations" patented technology

The invention relates to the technical field of waste hydrogenation catalyst treatment, and discloses a recovery method of active metal in a waste hydrogenation catalyst, a preparation method of a residual oil hydrogenation catalyst and application of the residual oil hydrogenation catalyst, and the method comprises the following steps: (1) leaching the waste hydrogenation catalyst by using an acid solution to obtain a leachate; (2) the concentration of hydrogen ions in the leachate is adjusted to be 0.05-2 mol / L, then the leachate is in contact with a first extraction agent, washing and reverse extraction are conducted, and a Mo solution is obtained; (3) adjusting the pH value of the first raffinate to 1-2.1, then contacting the first raffinate with a second extraction agent, and then carrying out washing and reverse extraction to obtain an Al solution; and (4) adjusting the pH value of the second raffinate to 2.2-3.5, then contacting the second raffinate with a third extraction agent, and then carrying out washing and reverse extraction to obtain a Ni and / or Co solution. The method can realize hazardous waste resource utilization, and can significantly reduce the production cost of the hydrogenation catalyst.

The invention relates to the technical field of wastewater treatment, in particular to a multi-stage treatment method and system for lead smelting wastewater. The method comprises the following steps: acquiring water quality data of the multi-source lead-acid storage battery smelting wastewater, and based on the water quality data, analyzing to obtain a battery wastewater multiphase feature set; on the basis, the information of the stabilized intermediate water body is obtained by dynamically adjusting the hydrogen ion concentration, breaking a complexing structure and preferentially separating fluoride; on the basis, the antimony valence state and the antimony concentration are monitored in real time, the oxidizing agent type and the reaction intensity are matched in a self-adaptive mode, oriented efficient conversion of antimony is achieved, and low-antimony pre-sedimentation water outlet information is obtained; on the basis, according to the dynamic proportion of the inlet water hydrogen ion concentration to the lead and antimony ions, a precipitation path control instruction is automatically switched, a purified water body with lead and antimony synchronously and deeply removed is obtained, and a lead smelting wastewater multi-stage treatment log is output. Harmful pollutants in the lead smelting wastewater process are efficiently removed, the method adapts to water quality fluctuation, consumption reduction and cost saving are achieved, compliance treatment of wastewater is achieved, and environment-friendly and economic values are achieved.

Provided are a method and a system for producing calcium carbonate, in which a content of alkali in calcium carbonate obtained using a calcium-containing waste can be controlled. There is provided a method (system) for producing calcium carbonate from a calcium-containing waste, including: a calcium dissolution step of adding aqueous hydrochloric acid to a calcium-containing waste and dissolving calcium to produce an aqueous solution containing a calcium ion; a separation step of adjusting a hydrogen ion concentration index of the aqueous solution containing a calcium ion and separating Mg and the like from the aqueous solution; a calcium carbonate preparation step of producing calcium carbonate by adding an aqueous solution containing potassium carbonate and / or sodium carbonate to the calcium ion-containing aqueous solution obtained in the separation step to cause a reaction to occur, in which in the calcium carbonate preparation step, an addition rate of the aqueous solution containing potassium carbonate and / or sodium carbonate is controlled such that κ represented by a specific expression is 3000 or lower.

There is provided a composition for a semiconductor process, the composition comprising silica particles, and the composition having a value of 6.30% to 9.60% according to Formula 1. Further, a composition for a semiconductor process is provided, the composition comprising silica particles, and having a value of greater than 5.80% and less than 8.80% according to Formula 2. Further, provided is a method for preparing a composition for a semiconductor process, the method comprising: a step (a) of stirring an aqueous dispersion solution of silica having a hydrogen ion concentration (pH) in the range of 4.0 to 5.5; a step (b) of introducing a silica surface modifier containing an aminosilane component when the temperature of the aqueous silica dispersion solution is 25 DEG C or more and less than 40 DEG C; (c) introducing a hydrogen ion concentration (pH) regulator into the aqueous silica dispersion solution into which the silica surface modifier has been introduced; and (d) stirring the aqueous silica dispersion solution into which the hydrogen ion concentration (pH) regulator has been introduced so that the final reaction temperature is within the range of 50 DEG C to 65 DEG C. Further, a method of manufacturing a semiconductor device using the composition for a semiconductor process is provided.

The application provides a magnetic field synergistic regulation reinforced micro-electrolysis sewage treatment method and equipment, which comprises the following steps: adjusting the hydrogen ion concentration index of sewage to obtain adjusted sewage, pumping the adjusted sewage to the water inlet of a micro-electrolysis reaction tower by using a lifting pump, making the adjusted sewage pass through the aeration device of the aeration area to be aerated, and then entering the micro-electrolysis reaction tower through a supporting layer; the magnetic field generating device is composed of the enameled copper wire coil wound outside the micro-electrolysis reaction tower and the iron-carbon micro-electrolysis filler in the tower, a magnetic field is formed in the micro-electrolysis reaction tower, and the size and direction of the magnetic field are adjusted in real time according to the water quality of the effluent; the adjusted sewage treated by the magnetic field is overflowed to the water collecting tank through the trapezoidal overflow weir, the water quality of the effluent is detected in real time by the online water quality monitoring system below the effluent outlet; the hydrogen ion concentration index of the inlet water, the magnetic field parameters and the aeration amount are adjusted in linkage to regulate the micro-electrolysis reaction conditions. The application improves the automation level and treatment efficiency of sewage treatment.

The application relates to the technical field of electrochemical detection, and specifically discloses an ammonium sulfate PH calculation method based on an electrochemical principle and a temperature compensation technology, which comprises the following steps: collecting a non-standard state electrode potential signal and an NTC thermistor real-time resistance signal of an ammonium sulfate solution to be measured; using an improved temperature fitting algorithm based on a temperature-resistance nonlinear relationship and an optimized fitting process to convert an actual thermodynamic temperature of the solution; combining the actual thermodynamic temperature to compensate the non-standard state electrode potential signal, eliminating the interference of temperature change on the potential measurement; and substituting the compensated electrode potential value and the thermodynamic temperature into a simplified expression of the Nernst equation to inversely solve the hydrogen ion concentration, and then obtaining the final PH value of the ammonium sulfate solution through negative logarithm operation. The method optimizes the temperature fitting precision and the electrode potential compensation adaptability, and improves the PH measurement deviation problem of the ammonium sulfate solution.

The present application relates to the technical field of pollution detection, in particular to a water body heavy metal chromium pollution detection method and system, the method comprising the following steps: obtaining the concentration of water body dissolved organic matter, hydrogen ion concentration, oxidation-reduction potential, temperature and initial hexavalent chromium concentration and normalizing, determining the reduction reaction rate constant according to the temperature and oxidation-reduction potential, predicting the reduction rate of hexavalent chromium, the theoretical reduction amount and the theoretical residual concentration, collecting the online electrochemical concentration and the unmanned aerial vehicle hyperspectral inversion concentration and performing difference verification, respectively correcting the electrochemical concentration and the hyperspectral concentration when there is data contradiction, and fusing the two types of correction results to judge the pollution state. In the present application, by establishing a hexavalent chromium natural evolution reference and combining multi-source observation consistency verification, the electrochemical underestimation caused by organic matter passivation and the hyperspectral overestimation caused by spectral background are identified, compensation correction and background stripping are completed, and the accuracy and reliability of chromium pollution detection in complex water bodies are improved.

The application belongs to the technical field of medical isotope production, and relates to a recovery and purification method of a target material, in particular to a recovery and purification method of a nickel target material in a Cu-64 preparation process. An acid is added to a recovered nickel solution in the Cu-64 preparation process to adjust the hydrogen ion concentration to 6-8 mol / L, so as to obtain an acidic nickel solution; a TK201 resin is used to perform one-column separation on the acidic nickel solution, so as to obtain effluent; and an AGMP-1 resin is used to perform two-column separation on the effluent, so as to obtain a recovered and purified nickel solution. The recovery and purification method can significantly reduce Cu, Co and other impurities, greatly improve the purity of nickel in the recovered nickel target material, and has a high nickel recovery rate.

The microelectrode array comprises a plurality of microelectrode cells, the microelectrode cell comprises a working electrode and a counter electrode, and the counter electrode generates alkaline ions to neutralize hydrogen ions generated by the working electrode. A simulation method for synthesizing DNA by using a microelectrode array comprises the following steps: establishing a three-dimensional model of the microelectrode array by using multi-physical field simulation software, and solving and calculating a physical field to obtain a calculation result; and post-processing the calculation result, and creating a drawing group about the hydrogen ion concentration. According to the microelectrode array and the simulation method of the synthesized DNA of the microelectrode array, the counter electrode is added into the microelectrode array, hydrogen ions generated by the working electrode are neutralized through basic ions generated by the counter electrode, crosstalk of the hydrogen ions is avoided, modeling analysis is conducted on the crosstalk condition of the hydrogen ions generated by the working electrode through multi-physics field simulation software, and the simulation result of the synthesized DNA of the microelectrode array is obtained. And theoretical guidance is provided for high-throughput synthesis of different types of DNA.

This invention discloses a method and system for the harmless treatment and beryllium ultrastable mineralization of lithium slag through agent-slag synergy, belonging to the field of solid waste treatment technology. It includes: dissolving active silica-alumina excitation components according to mineral diagnostic data to obtain a structural excitation liquid; simultaneously activating the lithium slag and the excitation liquid through mechanochemical processes, reconstructing the interface of the adsorbed excitation components, and generating a modified lithium slag matrix; preparing a mineralization assembly liquid based on the beryllium exposure of the matrix; introducing the assembly liquid into the matrix in a segmented gradient, controlling the hydrogen ion concentration to induce in-situ crystallization at the interface, and obtaining a primary stabilizer; pressing the stabilizer and placing it in an alternating electromagnetic field coupled with an endogenous exothermic environment to generate beryllium ultrastable mineralization products. This invention employs a comprehensive treatment method combining deep mechanochemical simultaneous activation and exposure with slow-release ion in-situ crystallization and endogenous thermomagnetic coupling to drive ordered cross-linking of the microstructure. This method can destroy the dense inert framework of the waste slag and forcibly drive the migration and trapping of heavy metals, ultimately achieving deep ultrastable mineralization and seepage prevention of beryllium toxic ions.

The utility model discloses a rainwater acidity and alkalinity detection device for environment detection, which relates to the technical field of rainwater acidity and alkalinity detection equipment, and comprises a collecting barrel, a flow guide cover movably connected to the top of the collecting barrel, a mounting ring fixedly connected in the collecting barrel, a clamping seat movably connected to the top of the mounting ring, and positioning components symmetrically mounted at the bottom of the clamping seat. Fixing columns are symmetrically and fixedly connected to the top of the clamping seat, fixing assemblies are mounted in the fixing columns, a mounting groove is formed in the inner wall of the clamping seat, a filter paper funnel is movably connected into the mounting groove, and a PH sensor is mounted on the inner wall of the collecting cylinder. By the adoption of the structure, solid impurities in rainwater can be effectively filtered out, the impurities are prevented from being attached to the surface of the pH sensor and disturbing accurate sensing of the pH sensor on the concentration of hydrogen ions in the rainwater, the filter paper funnel can be disassembled and assembled without complex steps and tools, the time needed for replacing the filter paper is greatly shortened, and the cost is reduced. And the working efficiency is improved.

The application provides a nickel solution preparation on-line monitoring system and method, and belongs to the technical field of non-ferrous hydrometallurgy; the system comprises a waste liquid receiving tank, an acid adjusting tank, a hydrogen ion on-line detection device and a controller; the hydrogen ion on-line detection device monitors the hydrogen ion concentration of a key area in real time; the controller automatically adjusts the adding amount of acid liquid and fresh water according to the detection signal, and controls the outlet flow in linkage, so that full-automatic acid adjusting and solution preparation are realized. The application can solve the problems of high labor intensity, low precision and poor safety of manual acid adjusting, realize accurate control of the hydrogen ion concentration, improve the qualified rate of acid adjusting, and thus improve the solution preparation efficiency and product quality.

The invention provides a method for recovering indium and bismuth from waste, and relates to the technical field of non-ferrous metal hydrometallurgy. The invention discloses a method for recovering indium and bismuth from waste materials. The method comprises the following steps that mixed waste materials containing indium and bismuth are obtained; adjusting the concentration of hydrogen ions in the mixed waste to a first concentration, carrying out primary agitation leaching, and separating to obtain a first-section leaching solution and first-section leaching residues; carrying out oxidation impurity removal treatment on the first-section leaching solution to remove first impurity ions in the first-section leaching solution, so as to obtain a purified solution; through metal replacement, indium ions in the purified liquid are subjected to metal replacement treatment, and crude indium is obtained; mixing the first-stage leaching residues, an acid leaching agent and a first oxidizing agent, carrying out secondary agitation leaching, and separating to obtain a second-stage leaching solution; and hydrolyzing the second-stage leachate, and separating to obtain a bismuth salt precipitate. According to the method, the indium recovery rate is greater than or equal to 98%, the bismuth recovery rate is greater than or equal to 95%, the refined indium grade is greater than or equal to 99.998%, and the bismuth salt precipitate purity is greater than

This invention relates to the field of chemical pharmaceutical manufacturing technology, and discloses a process for preparing compound sodium bicarbonate to improve acid-base balance. The process includes: preparing an alkaline sodium bicarbonate raw material solution and an acidic raw material solution containing calcium and magnesium salts; dispersing the alkaline raw material solution into droplet clusters using a coaxial gas-liquid atomizing nozzle and a carbon dioxide gas source; allowing the droplet clusters to absorb carbon dioxide and pre-regulate their own hydrogen ion concentration during vertical vector descent; introducing the droplet clusters into the acidic raw material solution to form a homogeneous system and dispensing them; sterilizing the pharmaceutical packaging containers using a terminal overpressure compensation method; and injecting carbon dioxide into the sterilization chamber during the heating stage to establish an external pressure barrier. This invention solves the contradiction of high-concentration calcium and magnesium ions and bicarbonate ions precipitation in a single homogeneous system by blocking the precipitation formation pathway through microscale acidification modification, achieving long-term physical stability and coexistence of the formulation.

The invention relates to the technical field of livestock breeding monitoring, and particularly discloses a sheep rumen health environment monitoring device and system. The device comprises a swallowable monitoring capsule, a multi-parameter sensing module integrated with biochemical, electrochemical biological and physical quantity sensing units is arranged in the monitoring capsule, and the monitoring capsule is used for synchronously collecting hydrogen ion concentration, volatile fatty acid concentration, ammonia nitrogen concentration, microbial metabolism electric signals, temperature and pressure data of rumen fluid in situ and transmitting the data through a wireless communication module. The system further comprises a data gateway and a remote server platform. A health analysis model operated by a server platform can carry out deep processing on the multi-source time sequence data, and early judgment of the sub-clinical rumen acidosis risk and quantitative evaluation of the feeding efficiency are achieved by executing a specific multi-condition linkage early warning algorithm and a metabolic balance evaluation algorithm. According to the invention, the defects of one-sided monitoring parameters and insufficient data utilization in the prior art are overcome, and a more comprehensive and intelligent rumen health management solution is provided.

The present method entails separating thorium by anion exchange to obtain a solution of a mixture of radium and actinium radionuclides, desorbing the thorium from the anion-exchange resin, separating the actinium and radium by cation exchange, and purifying the actinium of iron salt impurities and organic impurities. The thorium is desorbed using a solution containing a mixture of ammonium acetate and acetic acid. The actinium is purified of iron salts and organic impurities in a column containing two sorbents: a bottom layer comprised of a hydrophilic macroporous resin based on a polymethyl methacrylic acid ether; and a top layer comprised of a sorbent based on di(2-ethylhexyl)phosphoric acid applied to an inert carrier. The total concentration of ammonium acetate and acetic acid used in the desorption of thorium lies in a range of from 0.5 to 4.0 mol / L, and the concentration of hydrogen ions lies in a pH range of from 3.5 to 5.0. For added purification, the column is washed with a solution of hydrochloric acid having a concentration in a range of from 0.015 to 0.025 mol / L. The actinium is eluted using a solution of hydrochloric acid. The method makes it possible to isolate radionuclidically and chemically pure actinium-225 from a mixture containing radium-224, radium-225, thorium-228 and thorium-229 radionuclides.

Provided is a method for producing a lithium-containing solution that allows suppressing production cost for lithium production by increasing a lithium content rate in a solution after an eluting step, and suppressing amount of a solution used in a process after the eluting step. The method for producing a lithium-containing solution includes an adsorption step, an eluting step of bringing post-adsorption lithium manganese oxide into contact with an acid-containing solution to obtain an eluted solution, and a manganese oxidation step performed in this order. The eluted solution is separated into a high concentration lithium-eluted solution and a low concentration lithium-eluted solution. The acid-containing solution includes a solution prepared by adding acid to the low concentration lithium-eluted solution. With this aspect, since only the low concentration lithium-eluted solution is added to the acid-containing solution, a hydrogen ion concentration in the acid-containing solution can be increased by adding just a small amount of acid, which consequently allows suppressing amount of the acid-containing solution and allows suppressing amount of the eluted solution used in the manganese oxidation step.

The invention discloses a method for preparing high-purity calcium nitrate tetrahydrate by using fluorine-containing waste nitric acid, which comprises the following steps: S1, filtering the fluorine-containing waste nitric acid to remove impurities, and adding the fluorine-containing waste nitric acid into process water to enable the hydrogen ion concentration of the mixed solution to be 3-5mol / L; s2, removing impurities; s3, transferring the solution subjected to impurity removal into a reactor, adding lime milk, keeping the pH value at 6-9, continuously stirring, and then feeding into a filter pressing system to obtain a calcium nitrate tetrahydrate solution and calcium fluoride; s4, the calcium fluoride is rinsed and dried; s5, adding nitric acid into the calcium nitrate tetrahydrate solution to adjust the pH value, and sending the solution into an evaporation kettle for concentration; s6, after the density of the concentrated calcium nitrate tetrahydrate solution is greater than or equal to 1.65 g / mL, feeding the concentrated calcium nitrate tetrahydrate solution into a crystallization kettle to obtain calcium nitrate tetrahydrate crystals; s7, performing centrifugation; and S8, carrying out secondary crystallization. The lime milk is added into the fluorine-containing nitric acid to participate in the reaction, the nitrogen element and the fluorine element in the fluorine-containing nitric acid are recycled, the high-purity calcium nitrate tetrahydrate and calcium fluoride products are prepared, the process is simple, and the treatment cost is low.

The invention belongs to the technical field of high-temperature well fracturing materials, and relates to a slow-release acid for fracturing by utilizing phase state slow release and a preparation method thereof. The preparation method comprises the following steps: preparing urea phosphate crystals; in the preparation process of the water-based gel, urea is added and uniformly stirred, and the urea water-based fracturing fluid is prepared; and mixing the urea phosphate crystal and the urea water-based fracturing fluid to obtain the slow-release acid for fracturing. In the dissolving process, dissociation balance of urea phosphate crystals moves reversely due to the existence of excessive urea, the solubility of urea phosphate is reduced, the concentration of phosphoric acid dissociated from the solution is reduced, and the corrosion inhibition effect is achieved. In a high-temperature stratum, urea is subjected to a polymerization reaction, the concentration of urea in a solution is reduced, dissociation balance moves forwards, the solubility of a urea phosphate solid is increased, and the concentration of phosphoric acid dissociated from the solution is increased; and the ionization balance of phosphoric acid is promoted to proceed forward by the temperature rise, and the hydrogen ion concentration in the solution is increased, so that the acidity of the fracturing fluid is accurately controlled.

The invention provides a calcium supplement and a preparation method thereof, the calcium supplement comprises sugar alcohol, calcium salt, an aqueous solvent and an oily solvent, C sugar alcohol represents the concentration of the sugar alcohol in the calcium supplement, CH < + > represents the hydrogen ion concentration in the calcium supplement, Ksp represents the dissolution equilibrium constant of the calcium salt at 25 DEG C, the calcium supplement meets the condition that Ksp * CH + / C sugar alcohol is equal to 3.7 * 10 <-33 >-1.4 * 10 <-8 >. According to the calcium supplement, by controlling the Ksp value of calcium salt and comprehensively regulating and controlling the concentration of sugar alcohol and hydrogen ions, synergistic defoaming can be achieved, the quality stability is improved, and the shelf life is prolonged.

The invention provides a ternary material high-purity gradient recovery method and system based on leaching extraction, and relates to the technical field of waste battery material recovery, and the method comprises the following steps: carrying out heat treatment on a waste ternary material to separate an organic bonding component from a metal oxide; then, a sectional leaching process is adopted, the end point of a first leaching section is controlled by monitoring the cobalt and nickel ion concentration increment, a first leaching solution containing cobalt and nickel and first leaching residues are obtained, and the first leaching residues continue to be leached to obtain a second leaching solution containing manganese; according to the cobalt-nickel ion concentration and the hydrogen ion concentration in the first leaching solution, the ratio and the adding amount of an extracting agent are accurately calculated in combination with an extraction equilibrium constant and coordination saturation capacity, and extraction separation is carried out; performing back extraction on the extracted organic phase to obtain a crude cobalt solution, and determining whether selective secondary extraction is performed or not to obtain a high-purity cobalt solution by detecting the purity; and finally, carrying out segmented precipitation on the water phase to recover nickel. According to the method, efficient cascade separation of cobalt, nickel and manganese is achieved, and the metal recovery purity and the resource utilization rate are improved.

The positive lead paste of the lead-acid storage battery is prepared from the following raw materials in parts by weight: 6 to 10 parts of 1.26 to 1.38 g / cm < 3 > sulfuric acid, 9 to 11 parts of pure water, 3 to 7 parts of silane coupling modified inorganic nano material, 0.2 to 0.4 part of hydrogen ion buffering agent, 0.5 to 1 part of nano oxide colloid, 0.05 to 0.1 part of short fiber and 70.5 to 81.2 parts of lead powder. The silane coupling modified inorganic nano material can effectively inhibit disordered growth of PbSO4 when the volume of the positive active material is excessively expanded in the charging-discharging process, so that the utilization rate of the positive active material is increased; meanwhile, electrolyte can be adsorbed, a stable gel network is formed, and the concentration difference of the electrolyte is reduced. The hydrogen ion buffering agent can relieve hydrogen ion concentration polarization and effectively improve the charging receiving capacity. The nano oxide colloid can be filled into gaps of PbO2 particles to improve the binding force between active substances, and meanwhile, the nano oxide colloid is attached to the surface of the grid to reduce stripping of the active substances. The positive lead paste provided by the invention can remarkably improve the utilization rate of active substances, the charging acceptance and the cycle life, and comprehensively enhance the performance of the lead-acid storage battery.

The present invention provides a method of producing high-purity magnesium hydroxide from seawater or refined salt brine, which comprises: a) a purification step of filtering organic and inorganic impurities contained in seawater or refined salt brine; b) a precipitation step of calculating a hydrogen ion concentration index of the seawater or refined salt brine within a range calculated by a chemical equilibrium computer simulation, determining an amount of an alkali substance corresponding to the hydrogen ion concentration index based on the calculation, and adding the alkali substance to the seawater or refined salt brine subjected to the purification step, thereby selectively precipitating only magnesium ions to form magnesium hydroxide; and c) a drying step of drying the magnesium hydroxide.

The application discloses a method for removing sulfuric acid in pulping acid leaching residue and inhibiting dissolution of rare earth sulfate, and belongs to the technical field of hydrometallurgy. The acid leaching residue is subjected to N-1 (N is an integer) stage washing, and the Nth stage washing is performed by using a rare earth sulfate water leaching solution; after the washing is completed, the acid leaching residue is subjected to water leaching to obtain the rare earth sulfate water leaching solution and water leaching residue. The hydrogen ion concentration in the washing water after the first stage washing is greater than 12 mol / L, the REO content is less than 8 g / L, and the hydrogen ion concentration in the rare earth sulfate water leaching solution is controlled to be below 0.2 mol / L. Compared with direct washing, the use efficiency of production water is improved, water consumption is saved, the washing water consumption is reduced by more than 50%, the last stage is washed by the rare earth sulfate water leaching solution, dissolution of rare earth sulfate in the acid leaching residue is inhibited, hole formation is prevented, and the acid leaching residue is fully washed.

The invention discloses an energy-consumption-free liquid crystal color recyclable writing tool and a preparation method thereof, and belongs to the field of liquid crystal materials and display. The recyclable writing tool comprises a writing board and a writing pen; the writing board is made of a cholesteric liquid crystal polymer film; the writing pen is dipped with pen ink with different hydrogen ion concentrations; the cholesteric liquid crystal polymer film has the characteristic of reflecting circularly polarized light with single rotation, and the concentration change of hydrogen ions can cause expansion or compression of a polymer grid, so that the screw pitch of the cholesteric liquid crystal is changed, the reflection band of the cholesteric liquid crystal is adjusted, and the color of the cholesteric liquid crystal polymer film is changed. After the writing pen writes on the writing board, the cholesteric liquid crystal polymer film of the writing board absorbs moisture and volatilizes, the film returns to be colorless again, and meanwhile, the film is cleaned again by using an alkaline solution to return to a colorless state, so that recycling is realized; the method has the advantages of high response speed, rich color, recyclability, low cost and the like.

This invention relates to the field of computer-aided process design technology, specifically to a method and system for optimizing the formulation of biodegradable tableware materials. The method includes the following steps: generating equilibrium molecular conformations based on atomic coordinates and calculating initial formulation component parameters; converting modulus parameters to generate theoretical elastic recovery strain parameters; mapping models to calculate deformation and marking diffusion characteristic length parameters; calculating diffusion coefficients and flux parameters to update local hydrogen ion concentration indices; updating reaction rate constants and integrating them to generate finalized formulation structural parameters. In this invention, a microscopic molecular dynamics model is constructed to analyze interface voids to quantitatively assess compatibility; relaxation time spectra are used to invert elastic recovery strain to predict deformation risk; autocatalytic reaction and diffusion theories are combined to track hydrogen ion concentration evolution; a dynamic mapping between degradation and failure is established; and full life-cycle verification is completed in a virtual environment, significantly shortening the R&D cycle and reducing trial-and-error costs.

The invention relates to the technical field of aromatic amine preparation, and discloses a preparation method of naphthalene diamine, which comprises the following steps: in the presence of a catalyst and an auxiliary agent, enabling naphthalene diphenol to react with an ammoniation reagent to prepare the naphthalene diamine, the auxiliary agent comprises hydrophosphite and / or hydrophosphate. It needs to be explained that direct ammoniation of the naphthalene diphenol is not easy, so that hydrogen ions are introduced with the hydrogen phosphite and / or the hydrogen phosphate as an auxiliary, the hydrogen ion concentration is increased, after the hydrogen ions are combined with the naphthalene ring or hydroxyl of the naphthalene diphenol, the naphthalene ring electron density is reduced, the ammoniation step can be more easily carried out, and then the reaction time is shortened. If the concentration of hydrogen ions in the added auxiliary agent is too high, the hydrogen ions preferentially react with the ammoniation reagent to form ammonium ions, so that free ammonia molecules are reduced, the reaction time is prolonged, and the yield of the naphthylenediamine is reduced.

This invention provides a transcutaneous carbon dioxide measuring device that can improve detection sensitivity by improving the device body and measuring electrodes in a device that detects carbon dioxide diffused from the skin of patients, etc., by dissolving it in an aqueous solution and measuring it as a change in hydrogen ion concentration. [Solution] The transcutaneous carbon dioxide measuring device comprises a main body case, a holding block housed in a through-opening of the main body case and immersed in a mixed aqueous solution of sodium bicarbonate and sodium chloride, a glass electrode in a first through-hole of the holding block, a reference electrode in a second through-hole, a thermistor in a third through-hole, a film portion that seals the through-opening, holds the mixed aqueous solution, and allows carbon dioxide produced from the skin to pass through to the holding block, and a cap that protects the film portion and is fitted onto the main body case.

A wound therapy system having a wound dressing for treating a wound includes a sensor that measures a pH level at a wound area. The sensor has a circuit that includes a first electrode and one or more second electrodes. The first electrode has a changeable conductivity that changes according to a hydrogen ion concentration level. The one or more second electrodes are configured with a fixed conductivity that does not change with the hydrogen ion concentration level. The first electrode is coated with a porous protective membrane formed from a sulfonated and / or carboxylated copolymer.

The disclosure belongs to the field of preparation of radioisotopes for medical uses and relates to a method for extracting lead-212 and bismuth-212 from a thorium-232 decay chain, including: passing a solution containing thorium-232 decay chain substance through an anion exchange resin column, the solution containing thorium-232 decay chain substance containing halogen ions, and a concentration of hydrogen ions in the solution containing thorium-232 decay chain substance being more than 0.01 mol / L, lead-212 and bismuth-212 being adsorbed by the anion exchange resin column and other nuclides passing through the anion exchange resin column without being adsorbed; and introducing eluting agents to desorb lead-212 and bismuth-212 from the anion exchange resin column, so as to obtain lead-212 and bismuth-212 by separation and extraction. The disclosure can simultaneously extract lead-212 and bismuth-212 with a high extraction speed and high purity, and is not easy to cause organic pollution of products.