93 results about "Sodium hydrosulfide" patented technology

The invention relates to the technical field of high-molecular polymer synthesis, and particularly discloses a cracking method of high-alkalinity polysulfide rubber latex, which comprises the following steps: S1, carrying out mother liquor separation on polysulfide rubber latex, and then washing for 0-2 times to obtain the high-alkalinity polysulfide rubber latex; and S2, cracking the high-alkalinity polysulfide rubber latex into liquid polysulfide rubber by using a cracking agent composed of sodium sulfite, sodium hydrogen sulfite and sodium hydrosulfide, wherein the molecular weight of the liquid polysulfide rubber is 1000-5000. Compared with the prior art, the cracking agent composed of sodium sulfite, sodium hydrogen sulfite and sodium hydrosulfide is adopted, high-alkalinity polysulfide rubber latex can be cracked, the washing frequency is reduced, the process efficiency is improved, and the overall polysulfide rubber production efficiency is indirectly improved; meanwhile, the wastewater discharge amount is reduced, and the subsequent wastewater treatment cost is reduced. The raw materials required by the cracking agent are easy to obtain and low in cost.

The invention relates to the technical field of polyphenylene sulfide, in particular to low-molecular-weight polyphenylene sulfide low in chlorine and easy to purify and a preparation method thereof.The method comprises the steps that 1, sodium hydroxide, sodium acetate and sodium hydrosulfide with the required amount are sequentially put into a reaction kettle, then N-methyl pyrrolidone is added, and heating dehydration is conducted under nitrogen protection to obtain a mixed solution; step 2, adding preheated paradichlorobenzene into the mixed solution, adding a part of phase control agent at the required polymerization temperature and under the protection of nitrogen, and carrying out prepolymerization stage reaction; and step 3, after the prepolymerization stage is completed, carrying out segmented temperature control on the reaction system, adding the residual phase control agent, carrying out polymerization stage reaction, and after the reaction is completed, obtaining the low-molecular-weight polyphenylene sulfide which is low in chlorine and easy to purify. The low molecular weight polyphenylene sulfide with low chlorine radical residue and low ash content is prepared, the phase control agent is easy to prepare and low in price, and the preparation method is easy and convenient to operate and convenient to popularize and apply.

The invention provides a preparation method of a magnetic recoverable catalyst and a method for synthesizing 3-mercaptopropionic acid, and mainly solves the problem that a large amount of acid and alkali solutions are needed in the existing acrylonitrile-sodium hydrosulfide and acrylic acid-thiourea process routes. The thiohydracrylic acid synthesis catalyst is prepared. The use conditions of the catalyst are as follows: the temperature is 30-80 DEG C, the reaction pressure is 0.5-3 MPa, the mass ratio of the acrylic acid to the solvent is 0.1-5, and the mass ratio of the acrylic acid to the catalyst is 0.2-20. Compared with the prior art, the catalyst disclosed by the invention is used as a synthetic catalyst for preparing thiohydracrylic acid through reaction of acrylic acid and hydrogen sulfide, a solid catalyst and a liquid reaction system can be completely separated by adopting simple methods such as filtration, centrifugation or magnetic separation, and a complicated pickling step is not needed; and the problem that a homogeneous catalyst is difficult to rectify after salification in the use process is avoided.

The utility model relates to the technical field of chemical engineering, in particular to a sodium hydrogen sulfide solution storage tank flushing system which comprises a magnetic turning plate liquid level meter, a remote transmission liquid level meter, a sodium hydrogen sulfide storage tank, a condensation water pipeline, an upper flushing line, a lower flushing line and a remote transmission flushing line. A lower end inlet of the magnetic flap liquid level meter is connected with a lower end drain valve; a first short-circuit wire is led out from the sodium hydrosulfide storage tank to be connected to an outlet in the upper end of the magnetic flap liquid level meter, a second short-circuit wire is led out from the sodium hydrosulfide storage tank to be connected to an outlet in the lower end of the magnetic flap liquid level meter, a third short-circuit wire is led out from the sodium hydrosulfide storage tank to be connected to the remote transmission liquid level meter, and a remote transmission shower valve is arranged on the third short-circuit wire. On-line flushing of the sodium hydrogen sulfide solution storage tank is achieved, when liquid level display is different from remote liquid level, water flushing is carried out, checking is carried out again after flushing, and the operation risk is reduced.

The present invention relates to a preparation method and application of a black soldier fly worm sand biomass carbon-based solid acid catalyst. The preparation method comprises the following steps: first, the black soldier fly worm sand is sieved with a sieve, and then the sieved black soldier fly worm sand is added to a sodium hydrosulfide solution and stirred and soaked for several hours. The pretreated black soldier fly worm sand is washed three times with deionized water and dried in an oven for 24 hours. Finally, the pretreated and dried worm sand is pyrolyzed and carbonized at high temperature in a nitrogen atmosphere for several hours to obtain a biochar-based solid acid catalyst material. The present invention uses biomass worm sand as raw material, which is cheap and easily available, reduces the production cost of solid acid catalysts and biodiesel, and improves the utilization value of renewable resources. In the present invention, the carbon-based material is pretreated with a sodium hydrosulfide solution, which not only improves the acid catalytic activity of the catalyst, but also improves the pore structure of the catalyst, thereby improving the catalytic activity of the carbon-based material as a whole, and is expected to become a highly competitive clean process route.

The invention relates to the technical field of chemical material preparation, and particularly discloses a safe preparation method of a short fluorocarbon alkyl sulphobetaine surfactant, a product and application, and the safe preparation method comprises the following steps: (1) in a solvent system I, reacting epoxy chloropropane with secondary amine to obtain an intermediate 1; (2) in a solvent system II, reacting the intermediate 1 with sodium hydrosulfide or a hydrate thereof to obtain an intermediate 2; (3) reacting the intermediate 2 with short fluorocarbon alkyl iodide to obtain perfluoroalkyl thioether propyl tertiary amine; and (4) carrying out sulfonation treatment on perfluoroalkyl thioether propyl tertiary amine to obtain the short-fluorocarbon alkyl sulphobetaine surfactant. According to the invention, by designing a synthetic route without using a high-risk reagent, the safety and operability of the process are remarkably improved, and the sulphobetaine surfactant with excellent acid, alkali and salt chemical stability and excellent surface activity is successfully prepared; and a key material and a safe and reliable preparation process are provided for development of a new-generation efficient environment-friendly fire extinguishing agent.

The invention provides a method for removing chemical oxygen demand by using a catalyst prepared from acid mine wastewater, which comprises the following steps: recovering valuable elements in the acid mine wastewater, accurately adding sodium hydrosulfide to control conditions, recovering transition metal elements with catalytic activity in the acid mine wastewater by fractional precipitation, directionally preparing a nano-scale metal catalyst, and removing the chemical oxygen demand by using the catalyst prepared from the acid mine wastewater. And the chemical oxygen demand in the wastewater is degraded through the prepared nano-scale metal catalyst, so that the problem of environmental pollution caused by the mine wastewater and the wastewater containing the chemical oxygen demand is solved, and the dual effects of resource recovery and environmental treatment are realized.

The invention belongs to the technical field of chemicals, and discloses a synthesis method of dithioerythritol, which comprises the following steps: S1, mixing cis-1, 4-dichloro-2-butene, acetone and water, cooling to below zero, adding potassium permanganate, keeping the temperature to react for a certain time after the potassium permanganate is added, filtering and collecting filtrate, then extracting, collecting extract liquor, evaporating, cooling and crystallizing to obtain dithioerythritol; filtering and collecting solids, and drying to obtain 1, 4-dichloro-2, 3-butanediol; and S2, mixing 1, 4-dichloro-2, 3-butanediol, sodium hydrosulfide and methanol, carrying out a reflux reaction, filtering, evaporating methanol, adding dichloromethane, adding magnesium sulfate, dehydrating, freezing, crystallizing, filtering, collecting a solid, and drying to obtain the dithioerythritol. The method has the beneficial effects that substances such as cis-1, 4-dichloro-2-butene, sodium hydrosulfide and potassium permanganate are adopted as raw materials, the price is low, the raw materials are easy to obtain, the process is simple, the yield is high, and compared with an existing method, the scheme has the advantages that the raw material cost is greatly reduced, the product yield is increased, and the method is suitable for enterprise production.

The application discloses a kind of complex antimony-containing material high-efficiency antimony leaching method, solve the problem of low efficiency of antimony leaching and difficult solid-liquid separation when using conventional sodium sulfide alkali method to leach antimony.By alkali leaching and arsenic removal, copper and bismuth removal by chlorine salt reduction and acid leaching, and NaHS+NaOH combined antimony leaching after treatment, high-efficiency leaching and enrichment of antimony in complex antimony-containing material is realized.Compared with the leaching effect of sodium sulfide, the leaching efficiency of antimony is significantly improved, and the leaching rate of antimony in the process of NaHS+NaOH combined antimony leaching is stable at more than 96%.Compared with sodium sulfide, sodium hydrosulfide has the advantages of low price, low sodium content, low temperature and difficult crystallization, etc., so using sodium hydrosulfide instead of sodium sulfide to leach antimony can effectively reduce production cost, reduce sodium content in high-salinity wastewater from the source, and avoid the disadvantages of using liquid sodium sulfide storage tank, conveying pipeline, etc.

The invention relates to a polycarboxylic acid water reducer and a preparation method thereof, and belongs to the technical field of polycarboxylic acid water reducers. The polycarboxylic acid water reducer comprises the following components: isopentenyl polyoxyethylene ether, acrylic acid, an acrylate monomer, modified talcum powder, sodium lignin sulfonate, sodium gluconate, ethylene glycol monovinyl polyethylene glycol ether, ammonium persulfate, methyl ethyl ketone peroxide, sodium hydrosulfide, a chain transfer agent and deionized water. The prepared water reducing agent has excellent fluidity, dispersibility and mechanical strength after being added into concrete.

The invention relates to the technical field of polyphenylene sulfide, in particular to low-molecular-weight polyphenylene sulfide and a preparation method thereof.The preparation method of the low-molecular-weight polyphenylene sulfide comprises the steps that sodium hydroxide, sodium acetate and sodium hydrosulfide with the required amount are sequentially put into a reaction kettle, then N-methyl pyrrolidone is added, heating dehydration is conducted under nitrogen protection, and a mixed solution is obtained; adding preheated paradichlorobenzene into the mixed solution, adding part of an end-capping reagent at the required polymerization temperature under the protection of nitrogen, and carrying out prepolymerization stage reaction; and after the pre-polymerization stage is finished, carrying out temperature programming on the reaction kettle, adding the residual end-capping reagent, and carrying out polymerization stage reaction to obtain the low-molecular-weight polyphenylene sulfide. According to the invention, a specific amount of the end-capping reagent is added in the stages of prepolymerization and polymerization reaction, so that the chain growth of the polymerization reaction of the polyphenylene sulfide is actively terminated, and the low-molecular-weight polyphenylene sulfide with the molecular weight of less than 8000, narrower molecular weight distribution and good melting and viscosity properties is prepared.

The utility model relates to a calcium carbonate solid waste treatment device, and discloses a treatment device for calcium carbonate solid waste generated by sodium hydrosulfide purification, which comprises a box body, a plurality of spray heads and two crushing rollers, a filter assembly is arranged in the box body, and the two crushing rollers are arranged in the filter assembly and are rotatably connected with the inner wall of the box body; a driving assembly for driving the annular screen to rotate is arranged in the box body, a water conveying assembly is arranged in the box body, the multiple nozzles are arranged on the water conveying assembly, a blocking assembly for blocking nozzles of the multiple nozzles is arranged on the water conveying assembly, and a feeding pipe for conveying materials into the filtering assembly is arranged in front of the box body. The plane of the inclined panel makes contact with the nozzles of the multiple sprayers, due to the elastic force of the two springs, the plane of the inclined panel blocks the nozzles of the multiple sprayers all the time, and powder generated when calcium carbonate solid waste is broken is prevented from entering the nozzles of the sprayers, blocking of the nozzles is avoided, and damage to the nozzles is avoided.

The utility model relates to a kind of multi-stirring efficient vulcanization reaction kettle, including tank body, mixer and gas pipe, the liquid outlet of the mixer is connected with the side of tank body intercommunication;The side of tank body away from mixer is equipped with liquid outlet;Tank body bottom is equipped with slag outlet;Slag outlet is equipped with slag valve;The gas pipe is set in tank body top, and one end of gas pipe is inserted into tank body, and the other end is connected with gas conveying device.The utility model can mix waste acid and vulcanizing agent fully by mixer;And hydrogen sulfide gas is delivered to tank waste acid by gas pipe, so that hydrogen sulfide gas and waste acid react, conveniently recycle hydrogen sulfide gas, reduce the consumption of sodium hydrosulfide and sodium hydroxide, reduce processing cost.

The high-precision purification equipment comprises a distillation box and a condensation pipe, the lower end of the inner surface of the distillation box is movably connected with a second connecting shaft, the outer surface of the second connecting shaft is fixedly connected with stirring blades, and the right end of the top of the distillation box is fixedly connected with a sleeve; the left front end of the sleeve is communicated with the top of the distillation box through a one-way pipe. According to the sodium hydrosulfide distillation device, a sodium hydrosulfide solution is fed into the distillation box from the feed port, the heating plate is opened, the sodium hydrosulfide solution can be heated, steam generated by heating enters the front end of the inner cavity of the sleeve through the one-way pipe, enters the condensation pipe through the pipeline and finally enters the collection box through the pipeline, and in the process, the steam can enter the distillation box through the pipeline. The steam can blow the fan blades to rotate, the fan blades can drive the first connecting shaft to rotate when rotating, and the fan blades can drive the second connecting shaft to rotate under the cooperation of the single-face tooth synchronous belt, so that the stirring blades are used for stirring the sodium hydrosulfide solution, and the purification efficiency is effectively improved.

The invention discloses a method and a system for purifying a magnesium sulfate solution. The method comprises the following steps: pretreating a magnesium sulfate solution containing nickel and cobalt impurities to remove suspended matters and organic matters in the magnesium sulfate solution; adding sodium hydrosulfide into the pretreated magnesium sulfate solution, enabling nickel and cobalt to respectively react with the sodium hydrosulfide to generate precipitates, and carrying out solid-liquid separation to obtain the purified magnesium sulfate solution and precipitates containing nickel sulfide and cobalt sulfide; evaporating and crystallizing the purified magnesium sulfate solution to obtain magnesium sulfate crystals, and drying to obtain a magnesium sulfate product; and carrying out post-treatment on the precipitate containing the nickel sulfide and the cobalt sulfide, and recovering nickel and cobalt in the precipitate. The method can efficiently remove nickel and cobalt impurities in the magnesium sulfate solution, has the advantages of high efficiency, environmental protection, recoverable resources and the like, and can reduce the production cost and improve the resource utilization rate.

The invention relates to the field of wastewater treatment, and discloses a biological treatment process for sodium hydrosulfide production high-sulfur wastewater, which comprises the following steps: S1, culturing and activating active bacteria; s2, pretreating high-sulfur wastewater generated in the production process of sodium hydrosulfide; s3, introducing the wastewater into a multi-stage microbial battery reaction system; s4, dynamically regulating and controlling a microbial metabolism path in the multi-stage reaction system by arranging an intelligent bio-membrane reactor; s5, passing through a dual-electrode system and a tail end filtering device of a by-product control system; and S6, recovering electric energy generated in the microbial battery reaction system through an energy recovery system. Through a multi-stage microbial battery series connection structure, a continuous reaction path from high-concentration degradation to terminal deep purification is formed, the technical effects of keeping stable reaction efficiency and low residual rate under the condition of treating sulfides with different concentrations are achieved, and the problems that degradation capability is easy to attenuate and tail water fluctuates severely in a later treatment stage are solved.

The present invention relates to a method for recovering valuable elements from polymetallic arsenic acidic wastewater, comprising the following steps: metal element content detection; mixed precipitation of copper, arsenic, gold, and silver; purification of the acidic mother liquor for iron removal; preparation of high-quality gypsum; two-stage leaching of the harmful element arsenic; and arsenic solidification treatment. The method utilizes a rational combination of sodium hydrosulfide and 25# black powder to fully precipitate copper arsenic ions and fine gold and silver particles in the acidic wastewater, significantly improving the recovery rate of the target components. The precipitate is then subjected to two-stage leaching for arsenic removal using either a raw acidic wastewater solution or the addition of copper sulfate, thereby obtaining high-quality gold, silver, and copper concentrate while reducing the amount of copper sulfate used. The filtered iron-containing acidic mother liquor is then subjected to iron removal and gypsum treatment to produce high-quality gypsum and ferric hydroxide. The intermediate product, ferric hydroxide, is then directly used for arsenic removal from the arsenic-containing acidic mother liquor. Through a synergistic effect with lime milk, the harmful element arsenic can be efficiently removed, achieving comprehensive recovery and harmless treatment of the valuable elements in the acidic wastewater.

The invention belongs to the technical field of organic compounds, and particularly relates to a preparation method of 3-octanoyl thiopropyl triethoxy silane. The preparation method of 3-octanoyl thiopropyltriethoxysilane provided by the invention comprises the following steps: dissolving a sodium hydrosulfide solid and a sodium hydroxide solid in water under a protective atmosphere, adding a first phase transfer catalyst, and then dropwise adding capryloyl chloride for a first substitution reaction to obtain an intermediate; adding a second phase transfer catalyst into a system after the first substitution reaction, dropwise adding chloropropyltriethoxysilane to carry out a second substitution reaction, and carrying out post-treatment to obtain 3-octanoyl thiopropyltriethoxysilane; the post-treatment comprises the following steps: cooling a system after the second substitution reaction, separating liquid, and taking an organic phase; and washing the organic phase with water, and sequentially performing dehydration and distillation low boiling. The preparation method disclosed by the invention is simple and easy to operate, and the prepared 3-octanoyl thiopropyltriethoxysilane has relatively high purity and yield.

The invention relates to a method for rapidly estimating the content of arsenic in arsenic-containing waste acid, which comprises the following steps: obtaining a to-be-detected sample, filtering, adding a sodium hydrosulfide solution into the filtrate, shaking uniformly to obtain a reaction solution, and judging the content of arsenic in the to-be-detected sample according to the color of the reaction solution, the volume ratio of the filtrate to the sodium hydrosulfide solution being 50: 0.09-0.11. According to the method, the to-be-detected sample is obtained, the 30%-32% sodium hydrosulfide solution is added into the filtrate obtained after the to-be-detected sample is filtered, the content of arsenic in the to-be-detected sample can be rapidly estimated by observing the color of the reaction solution, detection can be conducted on the edge of a vulcanization reaction tank, the detection speed is high, the cost is low, the dosage of a vulcanization agent can be rapidly adjusted, and the detection efficiency is high. Excessive or too small addition amount of the vulcanizing agent is avoided, and the waste acid treatment cost is reduced.

The invention discloses a method for comprehensively enriching and recovering cadmium and thallium from complex arsenic sulfide slag, belongs to the technical field of harmless treatment of dangerous waste residues and resource recovery of rare and noble metals, and aims to solve the problems that the existing process is difficult to realize fractional separation of fluorine, chlorine, arsenic, cadmium and thallium in the arsenic sulfide slag, and the thallium is low in recovery rate and insufficient in purity. According to the method, fluorine and chlorine and thallium arsenic-cadmium lead are separated through graded alkaline leaching; the cadmium-containing lead slag is subjected to zinc electrodeposition waste liquid acid leaching and sodium sulfite and citric acid purification, and cadmium-containing coarse filtrate is obtained; adjusting the pH value of the thallium-containing arsenic liquid step by step, and adding sodium hydrosulfide for precipitation to obtain high-purity thallium slag; according to the method, no toxic gas is generated, the emission of wastewater is reduced by 80%, conventional equipment is used, industrialization is easy, and unification of harmlessness of hazardous waste and efficient recycling of resources is achieved.

The utility model relates to the technical field of chemical production, in particular to a pipeline system for preventing blockage of sediment at the bottom of a sodium hydrosulfide tank. The sodium hydrosulfide tank connector is arranged at the bottom of the sodium hydrosulfide tank body, and the sodium hydrosulfide tank connector is provided with a first port located in the tank and a second port located outside the tank; the Y-shaped loading pipeline comprises a connecting pipe, a first suction pipeline and a second suction pipeline which are distributed in a Y shape, the connecting pipe is connected with the first port, a plurality of first suction holes are formed in the first suction pipeline in the length direction, and a plurality of second suction holes are formed in the second suction pipeline in the length direction; the Y-shaped loading pipeline is horizontally arranged in the sodium hydrosulfide tank body; an inlet of the external loading pipeline is connected with the second port, an outlet of the external loading pipeline is connected with a loading connector of a transport vehicle, and a loading pump is arranged on the external loading pipeline. The problems that the sodium hydrosulfide storage tank is difficult to load and cannot be loaded are effectively solved, and meanwhile, the tank cleaning period of the sodium hydrosulfide storage tank is prolonged.

A composition sustainable-releasing hydrogen sulfide for promoting wound healing and the method for preparing the same are provided. The composition for promoting wound healing comprises a carrier and a plurality of hydrogen sulfide sustained releasing microspheres, wherein the hydrogen sulfide sustained releasing microspheres comprise a hydrophobic polymer, a surfactant and sodium hydrosulfide.

The utility model discloses a two-stage evaporation and concentration device for a sodium hydrosulfide-containing solution, which comprises an intermediate tank provided with a buffer inlet, a buffer outlet, a heat preservation steam inlet and a heat preservation liquid outlet; the two evaporation and concentration assemblies are respectively arranged on the feeding side and the discharging side of the intermediate tank, and each evaporation and concentration assembly comprises a feeding pump; the heating concentration unit comprises a heater, a separator and a circulating pump; a discharge pump; a live steam treatment unit; and a secondary steam treatment unit. According to the two-stage evaporation and concentration device for the sodium hydrosulfide-containing solution, the two evaporation and concentration assemblies are adopted for sequentially carrying out evaporation and concentration, the separation effect is improved, the operation conditions can be flexibly adjusted to meet the requirements of products with different concentrations, the equipment load can be shared together, the service life is prolonged, the maintenance cost is reduced, and equipment operation is more stable and reliable; the requirement of the device on the corrosion resistance of materials is reduced, and the intermediate tank avoids the situation that the fluidity is reduced due to material cooling through heat preservation.

The application discloses a preparation method and application of sodium thiazolinyl dithiopropane sulfonate, and comprises the following steps: adding 1,3-propane sulfolane solution and an oxidizing agent into a mixed solution containing 2-mercaptothiazoline, sodium hydrosulfide and a solvent at 5-25 DEG C, and then reacting at 20-35 DEG C, and then recrystallizing to obtain sodium thiazolinyl dithiopropane sulfonate; the one-pot method is used to synthesize sodium thiazolinyl dithiopropane sulfonate by using 2-mercaptothiazoline, sodium hydrosulfide and 1,3-propane sulfolane as raw materials, a series of problems such as low yield and low effective content caused by multi-step reaction and repeated purification are avoided, the yield (more than 80%) and the purity (more than 95%) of the product are greatly improved, and the product is beneficial to large-scale production.

The invention provides mercaptopropyl long-chain silane and a synthesis method and application thereof, and belongs to the technical field of chemical synthesis, and the synthesis method comprises the following steps: carrying out substitution reaction on chloropropyltriethoxysilane and fatty alcohol-polyoxyethylene ether, and then adding sodium hydrosulfide for reaction to obtain mercaptopropyl long-chain silane. The obtained mercaptopropyl long-chain silane can better improve the dispersity of white carbon black in a rubber material, the rubber material is better in wear resistance and lower in rolling resistance, and meanwhile mercaptopropyl long-chain silane is soluble in water and higher in environmental protection property.

The invention provides a synthesis method of mercaptopropyltrimethoxysilane, which comprises the following steps: dissolving industrial sodium hydrosulfide in a composite solvent, separating water through azeotropic distillation, reacting the separated and dewatered industrial sodium hydrosulfide-composite solvent solution with chloropropyltrimethoxysilane to obtain a reaction product, and carrying out heat preservation on the reaction product; carrying out cooling, filter pressing, rectification and separation on the reaction product subjected to heat preservation to obtain mercaptopropyltrimethoxysilane; the composite solvent comprises a first type of solvent and a second type of solvent, the first type of solvent is a non-water-soluble solvent, and the second type of solvent is a water-soluble solvent. According to the method, after water in sodium hydrosulfide is removed through azeotropic distillation, chloropropyltrimethoxysilane is added for full reaction, so that reaction products are prevented from being reacted with water, and after the reaction is completed, high-purity mercaptopropyltrimethoxysilane is obtained through cooling, filter pressing and distillation separation.

The application relates to a preparation method and application of a 2-acyl benzothiazole compound, which comprises the following steps: placing sulfur ylide in a sealed tube, adding a solvent to dissolve, and obtaining a first reaction system; adding nitrosobenzene into the first reaction system, stirring at a certain temperature for a certain time, and obtaining a second reaction system; adding sodium hydrosulfide, dimethyl sulfoxide, a metal salt, potassium persulfate and an alkali into the second reaction system, heating and stirring in the sealed tube to react, and obtaining a third reaction system; and carrying out post-treatment on the third reaction system to obtain the 2-acyl benzothiazole compound.The application has the advantages that the reaction condition is mild, the price of the sodium hydrosulfide sulfur source is low, and the reaction yield is high; the substrate applicability range is wide, various substrate structures can tolerate the reaction condition, and the 2-acyl benzothiazole derivative with diversified structures can be rapidly prepared.

The invention provides a postharvest normal-temperature logistics quality maintaining method for Wushan crisp plum fruits and application of the postharvest normal-temperature logistics quality maintaining method, and belongs to the technical field of fruit preservation. According to the method, the Wushan crisp plums are soaked in the sodium hydrosulfide, so that the preservation of the Wushan crisp plums is realized. The sodium hydrosulfide treatment can delay the reduction of color change and hardness of the picked Wushan crisp plums, delay the increase of respiration rate and ethylene generation rate of the picked Wushan crisp plums and the reduction of titratable acid content, inhibit the softening and rotting of the picked green crisp plums, prolong the shelf life, and improve the quality of the green crisp plums. The safe storage period of the fruits under the normal-temperature storage condition is prolonged by more than 3 days. Therefore, as an exogenous treatment substance which is simple to operate, safe and effective, sodium hydrosulfide has a certain application prospect in the field of preservation and fresh-keeping of the picked Wushan crisp plums.

The utility model relates to the technical field of sodium hydrosulfide, and discloses a novel sodium hydrosulfide flaking device which comprises an evaporation device shell, the filtering device is installed on the evaporation device shell, the evaporation box is fixedly connected to the interior of the evaporation device shell, the guide rod is fixedly connected to the interior of the evaporation box, the splitter plate is connected to the guide rod in a sliding mode, the elastic hose is fixedly connected to the splitter plate, and the spray head is installed at the bottom of the splitter plate. The crystallization box is connected to the interior of the evaporation box in a sliding mode, the driving assembly is installed on the evaporation box and the evaporation device shell, the positioning assembly is installed on the evaporation box and the crystallization box, the crystallization box is installed in the evaporation box through the positioning assembly, and the driving assembly drives the splitter plate to transversely move in a reciprocating mode. And the liquid sodium hydrosulfide is sprayed into the crystallization box through the spray head.

This invention belongs to the field of fine chemical technology, specifically relating to a method for preparing sodium hydrosulfide using acidic gas. The invention constructs a multi-stage co-current absorption system with progressively decreasing total alkalinity concentration. The product outlet is located at the stage with the lowest total alkalinity, utilizing a low-alkalinity medium to suppress CO2 absorption, reducing the generation of sodium carbonate impurities by more than 67% at the source. Combined with room-temperature chemical precipitation for decarbonization and staged cooling crystallization for impurity removal, the system systematically solves the problem of difficult removal of soluble impurity salts such as CO2, NH3, and sodium thiosulfate. This invention uses industrial sulfur-containing tail gas as raw material, fully utilizing the exothermic reaction between H2S and NaOH to maintain the absorption temperature. Vacuum evaporation utilizes the residual heat from condensation for staged replenishment, achieving efficient sulfur resource recovery and green production. The process is simple, the equipment is mature, and the production line can switch between producing 43% liquid sodium hydrosulfide or over 70% solid sodium hydrosulfide, flexibly adapting to tail gas with different H2S concentrations.