266 results about "Potassium ions" patented technology

The invention relates to the technical field of fire prevention, and discloses a high-and-low-voltage power distribution room fire prevention early warning system based on potassium ion aerosol fire extinguishing, which comprises a smoke fire detection module used for detecting fire related data inside and outside a high-and-low-voltage power distribution room; the fire related data comprises smoke data and temperature data; the comprehensive evaluation module is used for judging whether an adopted evaluation model is a temperature evaluation model or a smoke evaluation model according to the fire related data; the fireproof grade classification module is used for grading fireproof grades in the high and low voltage power distribution room according to the screened evaluation model; the fire prevention measure implementation module is used for starting the potassium ion aerial fog fire extinguishing equipment in the corresponding fire prevention subareas to extinguish fire according to different grades; the electrical characteristic monitoring module is used for monitoring the load current and arc signal intensity of electrical equipment in the high-low voltage power distribution room and the temperature change rate of key nodes in real time; according to the invention, multi-dimensional accurate monitoring and graded prevention and control of the fire risk of the high and low voltage power distribution room are realized.

The invention relates to the technical field of organic synthetic chemistry, in particular to a preparation method of ethyl 2-n-butyl acetoacetate, which comprises the following specific steps: S1, preparation of a composite solid base catalyst, S2, synthesis of ethyl 2-n-butyl acetoacetate, S3, post-treatment of a reaction solution, and S4, separation and purification of a product. The preparation method has the following beneficial effects that the magnesium-aluminum composite oxide is used as a carrier, and the composite solid base catalyst loaded with potassium and lanthanum has relatively high catalytic activity and selectivity; the magnesium-aluminum composite oxide carrier has a relatively large specific surface area and rich alkaline sites, so that a good catalytic environment is provided for the reaction; as a main active component, potassium ions can effectively activate alpha-active methylene of ethyl acetoacetate and promote formation of negative ion intermediates; the introduction of lanthanum ions can adjust the electronic structure of the catalyst, enhance the stability of the active center and inhibit the occurrence of side reactions.

The invention relates to an adsorbent based on an X molecular sieve and preparation and application thereof, and a preparation method of the adsorbent comprises the following steps: (1) mixing the X molecular sieve with a binder, molding and roasting to obtain a molded body; (2) treating the molded body obtained in the step (1) with an alkali solution to perform in-situ crystallization on the binder in the molded body to obtain a crystallized product; (3) carrying out partial barium ion exchange on the crystallized product obtained in the step (2) by using a barium salt solution, and drying to obtain a dried product; (4) carrying out ammonium ion exchange on the dried product obtained in the step (3) by using an ammonium salt solution, and roasting in a flowing atmosphere to obtain a roasted product; and (5) performing barium ion exchange and optional potassium ion exchange on the roasted product obtained in the step (4), and then drying to obtain the adsorbent. The adsorbent has at least two kinds of mesoporous channels with different apertures, has high barium ion exchange capacity, high adsorption capacity and compressive strength, and shows good adsorption selectivity and mass transfer performance when used for adsorption separation of p-xylene.

The invention discloses a tellurium-doped sulfurized polyacrylonitrile potassium storage negative electrode material and a potassium ion total battery, and belongs to the field of potassium ion batteries. In order to solve the technical problems of low sulfur utilization rate and poor rate capability when sulfurized polyacrylonitrile is used as a potassium storage negative electrode material, the tellurium-doped sulfurized polyacrylonitrile (Te-SPAN) material with high performance is synthesized in a tellurium doping manner. In the tellurium-doped sulfurized polyacrylonitrile (Te-SPAN), the content of tellurium is lower than 5%, the content of sulfur is 33%-39%, and the content of carbon is 59%-62%. When the Te-SPAN is used as a potassium storage negative electrode material, the Te-SPAN shows high potassium storage capacity, excellent rate capability and cycling stability. In addition, the potassium ion total battery assembled based on the composite negative electrode and the low-defect manganese potassium hexacyanoferrate positive electrode also shows very excellent electrochemical performance.

The invention belongs to the technical field of health-care food, and particularly relates to functional milk assisting in lowering blood pressure and a preparation method thereof.The functional milk comprises, by weight, 99.5% of raw milk and 0.5% of a potassium ion bridged citrus fiber-green tea polyphenol network, raw milk is sequentially subjected to trypsin and proline specific incision enzyme treatment, HPCD-ultrasonic treatment and pulsed magnetic field treatment. The invention provides a systematic solution, which exceeds a simple extraction and addition mode in the prior art, and solves the stability problem of the antihypertensive active component in the processing and storage process.

The invention discloses a functionalized hybrid flame retardant based on cyclodextrin-MOF (Metal Organic Framework) as well as a preparation method and application thereof, and belongs to the technical field of high polymer material science and flame retardance. The hybrid flame retardant (F-CD-MOF) has a core-shell structure, a core body is crystalline CD-MOF formed by self-assembly of cyclodextrin and potassium ions, and a shell layer is an organic interface layer which is formed by grafting of a silane coupling agent and contains an active functional group (-NH2 or-NCO). The preparation method comprises the steps of CD-MOF primary crystal synthesis, surface silanization functionalization and post-treatment. The flame retardant can be used as a reactive nanofiller for preparing a high-performance flame-retardant polyurea coating, a polyurea three-dimensional cross-linked network is embedded through covalent bonding, the UL-94 flame-retardant grade of the obtained coating reaches V-0 grade, the peak heat release rate is reduced by 40% or above compared with that of a pure polyurea coating, and the flame retardant has excellent mechanical properties and is suitable for industrial production. The fireproof coating is suitable for high-end fireproof fields such as building fireproof coatings and electric power facility fireproof coating materials.

The invention discloses a composite inducer for promoting adhesion and metamorphosis of marine bivalve mollusk larvae and an application method of the composite inducer. The composite inducer for promoting adhesion and metamorphosis of the marine bivalve mollusk larvae comprises glutamine, glutamic acid, potassium chloride, calcium chloride and taurine, and the concentration ratio of the glutamine to the glutamic acid to the potassium chloride to the calcium chloride to the taurine is 1: 1: 2 * 10: 1.7 * 10: 4. According to the application, glutamine, potassium ions, calcium ions, glutamic acid and taurine are matched, the application effect of the glutamine, the potassium ions, the calcium ions, the glutamic acid and the taurine in the aspect of improving the attachment and metamorphosis rate of the shellfish larvae is defined, the technical blank of multi-component cooperative regulation and control of the attachment and metamorphosis of the shellfish at present is filled, a new solution is provided for bivalve shellfish fry production, and the application prospect is wide. The method is of great significance in promoting healthy development of the mariculture industry.

The invention discloses a modified hard carbon material, a preparation method thereof and a battery, and relates to the technical field of battery negative electrode materials. The preparation method comprises the following steps: forming a hard carbon layer by taking grafted silicon dioxide as a template, coating the hard carbon layer with a soft carbon layer, coating the soft carbon layer with silicon dioxide, performing confinement carbonization, and removing the template. Wherein the grafted silicon dioxide contains hetero atoms S, and the hard carbon layer contains hetero atoms P. During preparation, a silicon dioxide template grafted with 3-mercaptopropyltriethoxysilane is prepared by a reverse micelle method, a phenolic resin precursor is coated to form the hard carbon layer, P is introduced through modification of triglycidyl phosphate, then an asphalt-based soft carbon layer is coated, and carbonization is performed to obtain the modified phenolic resin. And removing silicon dioxide to obtain the target material. According to the material, active sites and interlayer spacing are increased through precise doping of S and P, volume expansion is relieved through cooperation of soft carbon and hard carbon, ion adsorption is enhanced through oxygen groups, and the material shows high capacity and excellent cycle stability in secondary batteries such as potassium ions and the like and is suitable for the field of novel energy storage batteries.

This invention relates to a method for preparing carbon materials based on in-situ surface fluoride modification, comprising the following steps: ① dissolving carbon material powder, aluminum nitrate, and polyvinyl alcohol in anhydrous ethanol to obtain an aluminum nitrate solution; ② dissolving ammonium fluoride in a mixed solvent to obtain an ammonium fluoride solution; slowly adding the ammonium fluoride solution dropwise to the aluminum nitrate solution to carry out an in-situ AlF3 growth reaction to obtain a composite material precursor; ③ drying the composite material precursor and then calcining it using a programmed temperature rise method to solidify the coating layer, thereby obtaining the AlF3@C composite material. This invention also discloses the application of this carbon material. The preparation method of this invention is simple and low-cost, and can efficiently prepare AlF3@C composite materials. The obtained AlF3@C composite material, as a negative electrode material for potassium-ion or lithium-ion secondary batteries, can significantly improve a series of properties such as the initial coulombic efficiency, rate performance, cycle stability, and potassium ion diffusion kinetics of the battery.

This application provides a KVOH nanomaterial, its preparation method, and an aqueous zinc-ion battery to address the technical problem of low performance of vanadium pentoxide cathode materials in the prior art. The KVOH nanomaterial provided in this application is obtained by a solvothermal reaction in an aqueous ethylene glycol solution. The introduction of potassium ions in the reaction expands the ion transport channels between the electrode material layers, improving the cycle performance of the battery. At the same time, the introduction of tetravalent vanadium also increases the specific capacity of the battery, thereby solving the technical problem of low performance of vanadium pentoxide cathode materials in the prior art.

The invention relates to a pyrrole sulfonyl derivative, a preparation method thereof and application of the pyrrole sulfonyl derivative as a potassium ion competitive acid blocker. Specifically, the invention relates to a novel pyrrole sulfonyl derivative as shown in a general formula (I), a preparation method of the novel pyrrole sulfonyl derivative and application of the novel pyrrole sulfonyl derivative or a pharmaceutical composition containing the novel pyrrole sulfonyl derivative as a therapeutic agent, particularly application of the novel pyrrole sulfonyl derivative or the pharmaceutical composition containing the novel pyrrole sulfonyl derivative as a gastric acid secretion inhibitor and a potassium-competitive acid blocker (P-CABs) in biological medicine.

This invention relates to a potassium ion-responsive hydrogel based on iminoboronic ester bonds, its preparation method, and its applications. The hydrogel is prepared using guanosine, 2-formylphenylboronic acid, and polyoxyethylenediamine. The diol of guanosine forms a borate ester bond with 2-formylphenylboronic acid, and the primary amine in the polyoxyethylenediamine forms an imino group with the aldehyde group of 2-formylphenylboronic acid. The bases of guanosine form a G-quadruplex under the influence of potassium ions. The hydrogel has a porous network structure. The preparation method is as follows: A mixed aqueous solution of guanosine, 2-formylphenylboronic acid, and polyoxyethylenediamine is heated to boiling to obtain a clear solution. After cooling, the solution is mixed with a potassium ion solution to prepare the potassium ion-responsive hydrogel based on iminoboronic ester bonds. Compared with the prior art, the hydrogel prepared by this invention exhibits both temperature and potassium ion responsive characteristics.

The invention discloses application of a tobacco potassium transporter NtKUP6 gene in regulating and controlling the potassium ion content of tobacco leaves and a method for increasing the potassium content of the tobacco leaves, and belongs to the technical field of plant genetic engineering. The invention provides an NtKUP6 gene capable of regulating and controlling the potassium content of tobacco leaves and application of the NtKUP6 gene, the gene is a potassium transporter coding gene, and the base sequence of the gene is shown as SEQ ID NO.1. According to the invention, Real-time PCR (polymerase chain reaction) finds that the expression quantity of the gene at the root of tobacco is the highest, and then the gene in tobacco is respectively silenced and overexpressed by means of genetic engineering, and finds that compared with a contrast, the content of potassium ions in overexpressed tobacco plant leaves is obviously increased, and the content of potassium ions in silent tobacco plant leaves is obviously reduced. A new thought is provided for cultivating the high-potassium-content tobacco through gene expression regulation and control, and a new gene resource is provided for improving the potassium content of the tobacco through a molecular means.

The invention relates to a carbon-water composition for hydration of human bodies of sports people, a beverage containing the carbon-water composition and application of the beverage. The composition is prepared from the following active ingredients in parts by weight: 4 to 8 parts of trehalose, 0.1 to 1 part of glucose, 0.1 to 1 part of crystalline fructose, 0.1 to 1 part of maltooligosaccharide, 0.04 to 0.055 part of sodium (in terms of sodium ion content) and 0.015 to 0.025 part of potassium (in terms of potassium ion content). The carbon-water composition is combined with sodium and potassium, so that rapid absorption of water by horse race sports people can be promoted, the carbon-water composition has optimal human hydration, the human dehydration risk of the sports people is reduced to the greatest extent, and the exercise endurance of running people is improved.

The invention belongs to the field of organic electrolytes and potassium ion batteries, and particularly relates to a low-concentration ionic liquid electrolyte for breaking the concentration balance of potassium ions and anions and a high-energy-density potassium ion battery. The potassium ion battery comprises a Prussian blue (PB) positive electrode, an electrolyte and a commercial ferrocene (Fc) negative electrode which is not subjected to any treatment, and the electrolyte is a low-concentration ionic liquid electrolyte (FSI-: K + (3.5 / 0.3 M)) of potassium bis (fluorosulfonyl) imide (KFSI). The low-concentration ionic liquid electrolyte developed by the invention has a high anion: K < + > concentration ratio (3.5: 0.3 M), increases the solvation proportion of rich anions, reduces the dissolution of an Fc organic metal compound, and ensures high interface stability and rapid K < + > storage kinetics of an Fc negative electrode. Meanwhile, the electrochemical window of the low-concentration electrolyte is widened, the PB positive electrode can stably circulate at 1.0-4.4 V, the long-period circulation and excellent rate capability of the PBFc total battery are also realized, and the total battery has the energy density of 246.7 Wh / kg under the current density of 20 mA / g.

A process for producing lithium hydroxide monohydrate from lithium chloride, the process comprising: (a) adding an aqueous potassium ion and hydroxide ion-containing solution to an aqueous lithium chloride-containing solution, thereby obtaining a mixture comprising lithium hydroxide, potassium chloride and water, (b) selectively precipitating potassium chloride from the mixture, thereby obtaining potassium chloride precipitate and a first mother liquor solution, (c) separating the potassium chloride precipitate from the first mother liquor solution, (d) processing the potassium chloride precipitate to obtain an aqueous potassium hydroxide-containing solution, (e) adding the aqueous potassium hydroxide-containing solution to the separated first mother liquor solution, thereby obtaining a potassium hydroxide-enriched first mother liquor solution, and (f) selectively precipitating lithium hydroxide monohydrate from the potassium hydroxide-enriched first mother liquor solution, thereby obtaining lithium hydroxide monohydrate precipitate and a second mother liquor solution.

The application discloses a preparation method of lithium niobate microcrystal powder and belongs to the technical field of functional ceramic material powder preparation. The composition of the lithium niobate is LiNbO3. The preparation method of the lithium niobate microcrystal powder comprises the following steps: firstly, preparing lithium niobate powder doped with potassium ions and sodium ions (K 0.5 Na 0.5 ) 1‑x Li x NbO3, x =0.5~0.9; then, preparing a raw material mixture of lithium niobate microcrystals; and finally, preparing the lithium niobate microcrystal powder. The lithium niobate microcrystal powder prepared by the application is uniform and good in dispersity; the XRD analysis result shows that the crystallinity of the particles is high and the particles are pure lithium niobate; the application is simple in steps, the obtained product meets the requirements of lithium niobate ceramic raw materials, is small in mechanical pollution, small in formula deviation, easy to control in process, small in chemical composition deviation of the product, good in stability and capable of large-scale batch production.

The application discloses a modified hard carbon material and a preparation method and a battery thereof, and relates to the technical field of battery negative materials. The hard carbon layer is formed by using grafted silica as a template, then the soft carbon layer is coated outside the hard carbon layer, and then the silica is coated outside the soft carbon layer to limit carbonization and remove the template to obtain the target material; wherein the grafted silica contains a heteroatom S, and the hard carbon layer contains a heteroatom P; in the preparation, the silica template grafted with 3-mercaptopropyl triethoxysilane is prepared by a reverse micelle method, the phenol formaldehyde resin precursor is coated to form the hard carbon layer, P is introduced by modification of the trisglycidyl phosphate, and then the pitch-based soft carbon layer is carbonized, and then the silica is removed to obtain the target material. The material increases the active sites and the interlayer spacing by accurate doping of S and P, cooperatively relieves the volume expansion by the hard and soft carbons, and strengthens the ion adsorption by the oxygen groups, and exhibits high capacity and excellent cycle stability in the secondary batteries such as potassium ion batteries, and is suitable for the field of new energy storage batteries.

The invention discloses a method for cultivating low-potassium-tolerant rice. The rice OsSPL19 gene is directionally knocked out by using a CRISPER / Cas9 technology, and it is found that a transgenic plant with the OsSPL19 gene knocked out is sensitive to low potassium, the plant is short and small under low potassium treatment, the root is shortened, the potassium ion content of the root and the overground part is obviously reduced, and the potassium ion absorption capacity of the root is obviously reduced. Overexpression of the OsSPL19 gene in rice shows that a plant overexpressed by the OsSPL19 gene is tolerant to low potassium and grows well under a low-potassium condition, the potassium ion content of plant roots and overground parts is obviously increased, and the potassium ion absorption capacity of the roots is obviously enhanced. The result shows that the OsSPL19 gene participates in a rice low-potassium-resistant signal pathway and is a rice low-potassium-resistant gene. According to the invention, guarantee can be provided for improving the low-potassium resistance of the rice and cultivating low-potassium-resistant rice varieties.

The objective is to provide a method for dissolving solids that is excellent at dissolving solids generated in nuclear facilities. [Solution] A method for dissolving a solid generated at a nuclear facility, comprising dissolving the solid in a solution containing at least one of carbonate ions and bicarbonate ions, and at least one of potassium ions and cesium ions.

This invention discloses NtBRL2 The application of genes in regulating potassium content in plants belongs to the field of plant genetic engineering technology. This invention provides a gene that can effectively regulate potassium content in plant leaves, a feature of existing technologies. NtBRL2 This invention first discovered through Real-time PCR. NtBRL2 The gene was expressed at the highest level in tobacco roots; then, a silenced gene was constructed using virus-induced gene silencing (VIGS) technology. NtBRL2 The VIGS vector of the gene was transformed into Nicotiana benthamiana, and repression was successfully achieved. NtBRL2 Silent plants, obtained by silencing gene expression, exhibit a specific phenotype with significantly lower potassium ion content compared to control plants, indicating that silencing this gene can significantly reduce potassium ion content in plants. This invention lays the foundation for elucidating the biological regulation mechanism of potassium ions and provides precise regulatory sites for the regulation of potassium ion content in plants.

The invention discloses an alkaline zinc-manganese battery low-temperature-resistant electrolyte which comprises sodium hydroxide and potassium hydroxide, the potassium hydroxide accounts for 25%-35% of the total mass of the electrolyte, the sodium hydroxide accounts for 0.2%-8% of the total mass of the electrolyte, and the balance is deionized water. At low temperature, the attraction capacity of sodium ions to water molecules is higher than that of potassium ions, so that free water is inhibited from forming hydrogen bonds for curing, a stable solvation shell layer of Na < + > can guide OH <-> to bypass a loose hydration shell layer of K < + >, migration resistance is reduced, the number of water molecules wrapped by positive ions is increased, the migration speed of the positive ions in a solution is improved in a low-temperature environment, and the migration rate of the positive ions in the solution is increased. And the conductivity of the solution is improved.

The invention belongs to the technical field of battery positive electrode material preparation, and particularly relates to a cross-linked conjugated polymer, a preparation method and application in an alkali metal battery. When the cross-linked conjugated polymer is used as a positive electrode, the cross-linked conjugated polymer shows excellent performance in lithium, sodium and potassium ion batteries: the average discharge voltage is as high as 3.4-3.5 V, which is beneficial for improving the energy density of the battery; under extremely high current density, high capacity exceeding 120mAh. G <-1 > can still be released, and extremely fast dynamic characteristics are shown; and under the harsh test condition, the capacity retention ratio still reaches up to 85%-90%.

This invention discloses a method for potassium resource recovery from purified ash residue in calcium carbide production, comprising the following steps: crushing the purified ash residue from calcium carbide production, adding a certain amount of solvent to dissolve potassium ions and adjusting the alkalinity of the solution to retain high-valence calcium and magnesium ions in the ash residue; conducting a leaching reaction on the calcium carbide production ash residue through countercurrent circulation to significantly increase the potassium concentration in the leaching solution; adjusting the alkalinity of the potassium-rich solution and adding a functional extractant to perform ion exchange with potassium ions; loading the potassium extractant and separating it through an acidification reaction to obtain a potassium salt solution, which is then obtained by evaporation and crystallization to obtain solid potassium salt. The method of this invention can not only effectively extract potassium from purified ash residue from calcium carbide production, but also obtain potassium salts that meet industrial-grade standards. Furthermore, the method is simple, easy to operate, and readily scalable for industrial production.

The invention discloses a preparation method of lithium niobate microcrystalline powder, and belongs to the technical field of functional ceramic material powder preparation. The component of the lithium niobate is LiNbO3; the preparation method of the lithium niobate microcrystalline powder comprises the following steps: firstly, preparing lithium niobate powder (K < 0.5 > Na < 0.5 >) < 1-x > Li < x > NbO3 doped with potassium ions and sodium ions, wherein x is equal to 0.5-0.9; then preparing a raw material mixture of lithium niobate microcrystals; and finally preparing the lithium niobate microcrystalline powder. The lithium niobate microcrystal powder prepared by the method is uniform in particle and good in dispersity; xRD (X-Ray Diffraction) analysis results show that the crystallinity of the particles is high, and the particles are lithium niobate pure phases; the steps are simple and convenient, the obtained product meets the requirements of lithium niobate ceramic raw materials, the mechanical pollution is small, the formula deviation is small, the technological process is easy to control, the deviation of chemical components of the product is small, the stability is good, and large-scale batch production can be achieved.

The application relates to a high-conductivity double-carbazole type two-dimensional conductive metal organic framework material, a preparation method and application thereof, and belongs to the field of metal organic framework materials. Three double-carbazole type two-dimensional conductive metal organic framework materials Cu-DCA-MOF, Cu-DCPy-MOF and Cu-DCPt-MOF are prepared, all of which have a special "rotor-stator" structure, and are obtained by coordination polymerization of double-carbazole type ligands and metal ions. Due to the special "rotor-stator" structure of the double-carbazole type ligands, the three materials have high crystallinity and high conductivity, and have important significance in enriching the types and structural diversity of two-dimensional conductive metal organic framework materials. In addition, the double-carbazole type two-dimensional conductive metal organic framework materials with high conductivity can be applied in potassium ion batteries, and provide a new idea and solution for the development of positive electrode materials of the potassium ion batteries.

The invention relates to a potassium type neutralization regulation and control method in a sebacic acid fermentation process and application, a potassium hydroxide solution is used as a neutralizer, sebacic acid generated by microorganisms is neutralized in situ in the fermentation process, a product is accumulated in a high-solubility sylvite form, and the problem of sodion pollution caused by use of sodium hydroxide in a traditional process is avoided. The method comprises the core steps of strain activation, seed solution preparation, fermentation culture medium preparation, fermentation starting, pH dynamic regulation and control and product extraction. By automatically controlling the pH value to be 4.5-6.8, a 20-40% potassium hydroxide solution is fed, so that the fermentation acid production concentration reaches 180g / L or above. A potassium sulfate byproduct which is easy to dissolve in water is generated through subsequent acidification and crystallization, efficient separation can be achieved through washing, and a low-sodium / sodium-free high-purity sebacic acid product is obtained. According to the method, potassium ions are used as necessary elements for microbial growth to optimize a metabolic environment, so that the viscosity of fermentation liquor is remarkably reduced, dissolved oxygen transfer is improved, the environmental protection pressure of downstream extraction is relieved, and the production efficiency and the product quality are improved.

This invention provides a method for preparing a high-performance potassium adsorbent for potassium extraction from seawater, belonging to the field of ion adsorbent technology. The present invention features a large potassium adsorption capacity, high ion exchange site density, and outstanding enrichment capacity for low-concentration potassium ions. It exhibits very low adsorption capacity for calcium and magnesium ions in the influent, precisely rejecting high concentrations of coexisting sodium, calcium, and magnesium ions, achieving exclusive adsorption only for potassium ions, resulting in high purity of the enriched product. It possesses a highly stable crystal framework structure resistant to acids and alkalis, improving the cycling stability of the potassium adsorbent. The small crystal size is beneficial for increasing the adsorption capacity of the potassium adsorbent; due to the small crystal size, growth is more complete, with fewer crystal defects, which is conducive to improving selectivity and cycling stability. The three-stage calcination crystallization process allows different materials to undergo precise chemical reactions or crystal growth at different temperature stages, facilitating the acquisition of potassium adsorbent crystals with high adsorption capacity, high selectivity, and high cycling stability.

This invention discloses a reaction tube for recombinase polymerase amplification (RPA), belonging to the field of nucleic acid detection. The reaction tube of this invention includes a tube body and a cap separate from the tube body. The tube body contains lyophilized bulbs or lyophilized powder containing premixed nucleic acid detection reagents, and the cap contains lyophilized powder containing an activator. The tube body and cap are sealed with a thin film. The lyophilized bulbs or lyophilized powder containing the premixed nucleic acid detection reagents include: recombinase, single-stranded DNA-binding protein, strand displacement DNA polymerase, buffer components, ATP, ATP regeneration components, and dNTPs. The lyophilized powder containing the activator includes: potassium ions, magnesium ions, and polyethylene glycol. This invention enables magnesium acetate to stably adhere to the cap, solving the problem of easy spillage of the lyophilized activator in the cap. In use, only the nucleic acid of the sample to be tested needs to be added; the operation is simple, easy to promote and apply, and suitable for batch detection.