69 results about "Sodium propionate" patented technology

The invention provides a synergistic accelerant suitable for SNCR (selective non-catalytic reduction) denitration and application of the synergistic accelerant. The synergistic accelerant comprises the following components in parts by weight: 2-80 parts of an activating agent, the activating agent is selected from at least one of sodium glycinate, sodium glutamate, sodium iminodiacetate, sodium aspartate, sodium aminopropionate, sodium aspartate and potassium aspartate; 3-12 parts of a catalyst, wherein the catalyst is selected from soluble heteropolyacid; 1-10 parts of a catalytic promoter; the catalytic promoter is selected from at least one of soluble tungstate and molybdate. A trace amount of synergistic accelerant is added into a common SNCR denitration solution, so that the reaction speed of NOx and reducing agents such as ammonia or urea can be increased, a temperature window of SNCR reaction moves downwards, the application range of the traditional SNCR technology is expanded, the removal efficiency of NOx is improved, and a low-cost and high-efficiency method is provided for pollution abatement of nitric oxide in waste gas.

The invention relates to efficient anti-dandruff shampoo and a preparation method thereof, and belongs to the technical field of shampoo. The efficient anti-dandruff shampoo comprises the following raw materials: 0.7%-1% of a plant extract, 0.04% of asiatic acid, 30%-35% of a humectant, 7%-10% of a surfactant, 18% of sodium propionate, 2%-4% of a thickener, 0.2%-0.3% of an emulsifier, 0.8%-1% of an acidity regulator, 0.05% of tremella polysaccharide, 2%-3% of dextran enzyme, 0.3%-0.5% of a preservative, 2%-3% of a conditioner, 0.5% of isethionate and the balance of deionized water. Three effective components including lophatherum gracile ketone, cacumen biotae extract and cnidium monnieri extract are prepared into microcapsules to be added into the shampoo, the microcapsules are mixed with asiatic acid and an anti-dandruff component isethionate, and through the combined action of all the components, the purpose of effectively removing dandruff is achieved.

The present invention relates to a method for treating a bacterial infection by using Paracoccus wg1 T The invention relates to a method for treating wastewater containing high concentration of inorganic nitrogen, which belongs to the technical field of waste resource utilization and water environment treatment. T The seed liquid after culture is used to treat nitrogen-containing wastewater, and the Paracoccus wg1 of the present invention T , has a very high tolerance to high concentrations of inorganic nitrogen, and has excellent denitrification capabilities under conditions of high concentrations of inorganic nitrogen. Specifically, sodium nitrate is used as the nitrogen source, sodium propionate is used as the carbon source, NO3 ‑ When the ‑N concentration is 6258.85 mg / L‑N, 97.68 mg / L‑N of NO3 can be degraded in 48 hours ‑ -N; ammonium sulfate as nitrogen source, sodium propionate as carbon source, NH4 + When the ‑N concentration is 9326.28 mg / L‑N, 92.28 mg / L‑N of NH4 can be degraded in 48 hours + ‑N. paracoccus wg1 T Biological denitrification treatment of high-concentration inorganic nitrogen wastewater has great application prospects.

The invention provides a carbon fiber reinforced silicon carbide ceramic and a preparation method thereof, and belongs to the technical field of silicon carbide ceramics. The preparation method comprises the following steps: preparing functional carbon fibers, preparing modified silicon carbide microspheres, preparing a mixture, forming and calcining. The preparation method of the modified silicon carbide microspheres comprises the following steps: putting silicon carbide into an ethanol solution, adding sodium dodecyl amino propionate, carrying out ball milling treatment, and after ball milling is finished, filtering out and drying to obtain ball-milled silicon carbide; placing ball-milled silicon carbide in dimethyl sulfoxide, uniformly stirring, adding modified sodium alginate and hydroxyethyl cellulose, heating to 70-74 DEG C, adding tetrabutylammonium bromide, carrying out heat preservation reaction for 10.0-11.5 hours, and after the reaction is finished, filtering, washing and drying to obtain modified silicon carbide microspheres; the prepared ceramic product is high in strength performance and toughness, low in thermal expansion coefficient and excellent in high-temperature oxidation resistance.

Disclosed are a feed additive for improving the ovulation rate and litter size of sows, a preparation method therefor, and a use thereof. The feed additive is composed of three short-chain fatty acid salts, which are respectively sodium acetate, sodium propionate, and sodium butyrate. Sow feed contains the above feed additive, and the amount of the feed additive that is added is 0.1%-1% of the total weight of the basic daily diet of a sow. The feed additive of the present invention has a simple preparation process and low production costs and has the effect of significantly improving the ovulation rate and litter size of sows.

The invention discloses a refreshing oil-control composition as well as a preparation method and application thereof, and belongs to the field of daily cosmetic preparations. The refreshing and oil-control composition is prepared from the following components: a skin conditioning component, Lignum seu Fructus Liu Citri sodium oleate, sodium cocoyl aminopropionate, disodium lauroyl glutamate, lauramide propyl betaine and a solvent, the skin conditioning component consists of a hyperforin perforatum flower / leaf / stem extract, a capparis spinosa fruit extract and a sanguisorba officinalis root extract. The refreshing oil-control composition provided by the invention has excellent performance of inhibiting grease secretion of human sebaceous gland cells, and has an excellent deep oil-control effect on skin; according to the present invention, the stellaria mellea L sodium oleate, the cocamidopropyl sodium propionate, the disodium lauroyl glutamate and the lauramide propyl betaine are matched to use so as to provide effects of good foaming power and stable and lasting foam; the refreshing oil-control cleaning product provided by the invention can obviously reduce the grease content of skin, improve oily skin and realize an oil-control effect.

The invention relates to a liquid detergent composition comprising a first surfactant selected from fatty alcohol ether sulfates, a second surfactant selected from betaines, optionally at least one solvent selected from ethanol, propanol, isopropanol, ethylene glycol, butyl glycol, propylene glycol, polypropylene glycol, alcoholamine, monoethanolamine, glycerol and mixtures thereof, wherein the salt concentration in the composition is about 0.2 to about 10 wt.-% and wherein the salt is selected from the group consisting of sodium salts such as sodium chloride, sodium sulfate, sodium formate, sodium acetate or sodium propionate, potassium salts such as potassium chloride, potassium sulfate, potassium formate, potassium acetate or potassium propionate, magnesium salts such as magnesium chloride, magnesium sulfate, magnesium formate, magnesium acetate or magnesium propionate, and calcium salts such as calcium chloride, calcium sulfate, calcium formate, calcium acetate or calcium propionate, and mixtures thereof, and wherein the composition is a concentrate that can be diluted with water while maintaining or increasing the viscosity.The present invention further relates to the use of such a cleaning composition for cleaning hard surfaces, in particular dishes, and to a process for preparing a cleaning composition, the process comprising diluting the concentrated liquid cleaning composition with water.

A cleaning solution for a turbine engine includes water; a first organic acidic component that comprises citric acid; a second organic acidic component that comprises glycolic acid; isopropylamine sulphonate; alcohol ethoxylate; triethanol amine; and sodium lauriminodipropionate. The cleaning solution has a pH value between about 2.5 and about 7.0.

The invention discloses an efficient composite carbon source sewage treatment agent and a preparation method thereof, and belongs to the technical field of sewage treatment, the efficient composite carbon source sewage treatment agent comprises the following components by mass: 1-3% of polyvinyl alcohol, 1-4% of sodium formate, 2-5% of humic acid, 2-14% of modified loofah sponge, 4-16% of modified chitosan, 5-20% of glucose, 5-20% of sodium propionate, and 48-51% of water; the efficient composite carbon source sewage treatment agent can effectively reduce COD (Chemical Oxygen Demand) and total nitrogen.

The invention discloses a multi-effect mild facial cleanser and a preparation method thereof, and belongs to the technical field of nursing products. The facial cleanser is prepared from the following components: EDTA-2Na (Ethylene Diamine Tetraacetic Acid), an amino acid surfactant, a glucoside surfactant, a betaine surfactant, glycolipid, glycerol, EGDS (Ethylene Diamine Tetraacetic Acid), propylene glycol laurate, water and the like. Based on the matching use of sodium lauroyl methyl aminopropionate, palmitoyl glycine and other amino acid surfactants, the facial cleanser can effectively overcome the technical problems of difficult thickening, poor foam stability and the like of a traditional amino acid facial cleansing product, and also can relieve chronic skin inflammation, restore skin balance and promote microangiogenesis, so that the facial cleanser has the effects of nourishing skin and improving skin quality. The skin is recovered to a young and compact state, and the full components are ensured to have a biodegradable characteristic.

The invention provides a method for reversibly regulating and controlling the water solubility of long-chain alkyl trimethyl ammonium bromide, which comprises the following steps of: mixing sodium benzyl selenopropionate serving as an auxiliary agent with long-chain alkyl trimethyl ammonium bromide, adding water for dissolving, reducing the Krafft temperature of the long-chain alkyl trimethyl ammonium bromide to 10 DEG C or below, and then adding sodium benzyl selenopropionate, according to the method, benzyl selenium sodium propionate is oxidized into benzyl selenium oxygen sodium propionate by adding an oxidizing agent, so that the KT of long-chain alkyl trimethyl ammonium bromide is increased, and the water solubility of the long-chain alkyl trimethyl ammonium bromide is reduced, so that the long-chain alkyl trimethyl ammonium bromide is crystallized and separated out from an aqueous solution, and the separation, recovery and reutilization of the long-chain alkyl trimethyl ammonium bromide are realized; the residual water phase solution after the long-chain alkyl trimethyl ammonium bromide is recovered can be used as the plant leaf selenium fertilizer.

A concentrated cleansing composition comprises: 6 to 30% by weight based on the total weight of the concentrated cleansing composition preferably 17 to 20% by weight, of an anionic surfactant; 4 to 8% by weight based on the total weight of the concentrated cleansing composition, preferably 4 to 6% by weight, of a co-surfactant comprising sodium acyl amphoacetate, sodium acyl amphopropionate, disodium acyl amphodiacetate and disodium acyl amphodipropionate, betaine, or a combination thereof; 0.05 to 2.0% by weight based on the total weight of the concentrated cleansing composition of a sensory modifying agent, wherein the sensory modifying agent comprises isohexadecane, a silicone, a cationic polymer, a polymer of ethylene oxide, or a combination thereof; and 30 to 85% by weight of water based on the total weight of the concentrated cleansing composition; wherein a pH of the concentrated cleansing composition is 3 to 6, preferably wherein the pH is 4 to 5.

The invention relates to a sodium propionate-containing hydrate inhibitor for guaranteeing flow of a carbon dioxide conveying pipeline, which comprises sodium propionate, glycine, polyvinyl pyrrolidone and methanol, and the sodium propionate, the glycine, the polyvinyl pyrrolidone and the methanol are mixed with a sodium chloride solution serving as a solvent, so that the sodium propionate, the glycine, the polyvinyl pyrrolidone and the methanol are mixed according to the molar percentage as follows: 1-15 mol% of the sodium propionate, 1-15 mol% of the glycine, 0.1-1 mol% of the polyvinyl pyrrolidone and 5-60 mol% of the methanol. The sodium propionate, the glycine, the polyvinyl pyrrolidone and the methanol are compounded for use, so that the effect of a single inhibitor is enhanced, the application range is wider, a better inhibition effect is achieved at a lower concentration, and the generation of carbon dioxide hydrate can be better inhibited. The mixed use reduces the cost of the inhibitor, reduces the use amount of the mixture, and weakens the toxicity and pollution of the inhibitor.

The invention relates to the field of organic chemical synthesis, and discloses a method for preparing homo-2-methyl-4-chloropropionic acid. Comprising the following steps: reacting chiral 2-chloropropionic acid with a liquid caustic soda solution to generate sodium 2-chloropropionate, reacting p-chloro-o-cresol with liquid caustic soda to generate sodium p-chloro-o-cresol, carrying out nucleophilic substitution reaction to generate a precursor of 2-methyl-4-chloropropionic acid, carrying out acidification reaction to generate 2-methyl-4-chloropropionic acid, cooling, crystallizing, purifying, extracting with a solvent and the like. By controlling reaction conditions, such as temperature, pH value, reaction time and the like, a high-yield and high-purity product is ensured, and the optical loss is less than 1.5%. The method is efficient, environmentally friendly and suitable for large-scale industrial production, and high quality and stability of 2-methyl-4-chloropropionic acid can be guaranteed.

A liquid composition for use in purifying an oil contains a polar polymer, a surface active hydrotrope / solubilizer, and a co-tenside. The polar polymer may be a polyalkylene glycol, such as polyethylene glycol. The hydrotrope / solubilizer may be an anionic sulfonic acid, a phosphate ester-based substance or a non-ionic surfactant from the poly-glycoside family. The co-tenside may be at least one amphoteric co-surfactant, such as sodium caprylimino dipropionate.

The invention discloses a synthesis, separation and purification method of N-alkyl-beta-aminopropionate, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: sequentially carrying out addition reaction and saponification reaction on long-chain fatty amine and an acrylate compound to obtain saponification reaction liquid; adjusting the temperature of the saponification reaction solution to 55-70 DEG C, adding water, adjusting the pH value to 3.0-5.0 by using an acid solution, fully stirring, standing for layering, separating out an upper organic layer while the solution is hot, continuously adjusting the pH value of the organic layer to 0.5-1.5 by using the acid solution, cooling to realize layering, separating out an upper product, and neutralizing by using an alkali solution to obtain the N-alkyl-beta-aminopropionate. The method has the advantages of simple operation, short flow, high product separation recovery rate and high purity, can reduce the production cost of the N-alkyl-beta-amino sodium propionate, and meets the industrial production.

A lentiviral vector production system comprises (a) a lentiviral culture supplement to control cell growth, (b) a transfection reagent comprising DHDMS, DOPE, and cholesterol to increase transfection efficiency, (c) a lentiviral production enhancer comprising sodium propionate, sodium butyrate, and caffeine to boost lentiviral production, wherein the lentiviral vector production system is serum-free. A method of lentiviral vector production comprises using the lentiviral production system. Another method for lentiviral vector production comprises (a) culturing eukaryotic cells in a serum-free medium, (b) providing a lentiviral culture supplement to control cell growth, (c) transfecting the cells with a lentiviral vector using a transfection reagent comprising DHDMS, DOPE, and cholesterol to increase transfection efficiency, and (d) providing a lentiviral production using a lentiviral production enhancer comprising sodium propionate, sodium butyrate capable of boosting lentiviral production.

A process for producing a nitrogen-doped peony-shaped molybdenum oxide, comprising the following steps: (1) adding a regulator to a molybdenum-containing solution for reacting, concentrating and thermally treating to obtain a peony-shaped molybdenum oxide; and (2) dissolving the peony-shaped molybdenum oxide in a conditioning agent and adding an amine source for standing, centrifuging, washing, and heat-treating, thereby obtaining the nitrogen-doped peony-shaped molybdenum oxide; wherein the regulator is at least one of the following: nitric acid, ammonium nitrate, sodium persulfate, ammonium persulfate, concentrated sulfuric acid, H2O2, ozone, sodium hypochlorite, wherein in step (2), the conditioning agent is at least one of the following: sodium acetate, ammonium acetate, sodium formate, diaminoethane, sodium oxalate, ammonium benzoate, sodium phenylacetate, sodium propionate, sodium tartrate, sodium citrate, ammonium citrate; and wherein in step (2) the amine source is at least one of the following: aniline, dimethylamine, trimethylamine, benzylamine, phenethylamine, ethylamine, diethylamine, propylamine, phenylenediamine, xylylenediamine, amphetamine.

The invention relates to the technical field of cement production, and particularly discloses a cement mineralizer as well as a preparation method and application thereof. The cement mineralizing agent is prepared from the following raw material components in parts by weight: 15 to 25 parts of N-methyldiethanolamine, 8 to 20 parts of polytetramethylene ether glycol, 2 to 8 parts of citric acid, 6 to 12 parts of modified aluminum hydroxide and 1 to 3 parts of glycine, wherein the modified aluminum hydroxide is aluminum hydroxide modified by bis (dioctyloxy pyrophosphate) ethanediolato titanate and sodium lauroyl methyl aminopropionate. The cement mineralizer disclosed by the invention does not contain sulfur and chromium, is small in environmental pollution, has relatively excellent alkaline absorption capacity and stability, and can improve the fluidity and durability of cement and promote the hydration reaction of the cement, so that the early strength of concrete is improved.

The present invention discloses a method and application for reducing the content of levulinic acid in caramel. The method for reducing the content of levulinic acid in caramel provided by the present invention comprises the following steps: S1, making a syrup having a pH of 7 to 8 undergo a caramelization reaction in a reducing atmosphere, reacting to a chroma of 12000-17000EBC, and obtaining a preliminary caramel; S2, adjusting the pH of the preliminary caramel to 8 to 9, performing a secondary caramelization reaction in a reducing atmosphere, reacting to a pH of 5 to 7, and obtaining a caramel. The present invention is carried out by two caramelization reactions under alkaline conditions, so that levulinic acid is produced later and in less amount; meanwhile, the reaction is carried out in a reducing atmosphere, and levulinic acid can be deacetylated to generate ethanol and sodium propionate, thereby further reducing the content of levulinic acid in caramel, and ensuring that the caramel has good product quality, such as good red index and salt tolerance.

The invention relates to plant-based anti-hair loss shampoo and a preparation method thereof, and belongs to the technical field of cosmetic washing and care. Comprising the following raw materials in percentage by weight: 25%-26% of a humectant, 17%-19% of sodium propionate, 11%-13% of a pH regulator, 7%-9% of sodium sarcosinate, 2%-3% of dextran enzyme, 1.5%-1.7% of silicone oil, 0.5%-1.5% of carbomer, 0.7%-0.9% of litsea cubeba oil, 0.6%-0.8% of a preservative, 0.3%-0.5% of a cacumen biotae extract, 0.2%-0.4% of asiatic acid liposome, 0.1%-0.3% of a fructus cnidii extract, 0.05%-0.15% of a lophatherum gracile extract, 0.04%-0.06% of tremella polysaccharide and the balance of water. 0.04-0.06% of almond oil and the balance of deionized water. The shampoo prepared by the invention is natural and safe in components and has a good anti-hair loss effect.

The invention discloses application of digital printing ink based on medium-high reactive group reactive dyes, which comprises paste and double-active-group printing ink raw materials: the double-active-group printing ink raw materials comprise 5-30% of dye, 2-30% of humectant, 10-20% of cosolvent, 0.1-0.2% of PH regulator and bactericide, and the balance of deionized water, and then the printing ink is prepared by mixing the paste, the humectant, the cosolvent, the PH regulator, the bactericide and the balance of deionized water, the paste comprises 0.5-1% of sodium alginate, 0-0.3% of baking soda, 0-3% of sodium acetate, 0-3% of sodium propionate, 1-2% of reserve salt and 0-1.5% of penetrant, the invention relates to the technical field of digital printing, the printing color domain space is increased on the premise of ensuring the color fastness, so that the color is fuller, and the layers are richer; urea is not used in fabric pretreatment, meanwhile, due to the fact that the reaction performance is improved by about 20% or above, unreacted dye falling off in water washing is correspondingly reduced, the content of ammonia nitrogen, pigment, COD and BOD5 in sewage is improved, and the method is more environmentally friendly.

The application discloses a method for synthesizing N-alkyl-beta-amino propionic acid sodium from alkyl amine and 3-halogenated propionic acid ester, and belongs to the technical field of organic synthesis. Long-chain fatty amine and an alkali catalyst are dissolved in a solvent to form a uniform solution, then 3-halogenated propionic acid ester is slowly added dropwise in the solution to perform a substitution reaction, after the completion of the substitution reaction, a sodium hydroxide solution is added to perform a hydrolysis reaction, and thus N-alkyl-beta-amino propionic acid sodium is obtained. The method has the characteristics of simple operation, mild conditions, easy separation of the product, high yield and the like.

According to the method for enhancing the slaughter performance of the sheep and the umami substances in the mutton, the optimized feed is obtained by adding 20 g of sodium propionate into basic feed of the sheep per day, daily feeding is carried out, the palatability is high, the method is not limited to regions and feeding environment conditions, and the slaughter rate of the sheep and the umami of the mutton can be effectively improved. Sodium propionate is added to sheep feed to increase the level of umami substances (such as glutamic acid) in mutton. In addition, the supplementation of sodium propionate can also optimize and change the gastrointestinal flora composition, the metabolite content and the muscle metabolite level of the sheep. The method has potential application value in the field of sheep breeding.

The application provides a synergistic promoter suitable for SNCR denitration and application thereof, the synergistic promoter comprises the following components in parts by weight: 2-80 parts of an activator, the activator is selected from at least one of sodium glycinate, sodium glutamate, sodium iminodiacetate, sodium aspartate, sodium aminopropionate, sodium aspartate and potassium aspartate; 3-12 parts of a catalyst, the catalyst is selected from a soluble heteropoly acid; 1-10 parts of a catalytic aid; the catalytic aid is selected from at least one of a soluble tungstate and a molybdate. A trace amount of the synergistic promoter is added in a commonly used SNCR denitration solution, the reaction speed of NO x with a reducing agent such as ammonia or urea can be accelerated, the temperature window of SNCR reaction is moved downwards, the application range of traditional SNCR technology is expanded, the removal efficiency of NO x is improved, and a low-cost and high-efficiency method is provided for nitrogen oxide pollution treatment in waste gas.

The application relates to a sodium propionate hydrate inhibitor containing sodium propionate for carbon dioxide conveying pipeline flow guarantee, which comprises sodium propionate, glycine, polyvinyl pyrrolidone and methanol, and the molar percentage of the four after being mixed with a sodium chloride solution as a solvent is as follows: 1-15mol% of sodium propionate, 1-15mol% of glycine, 0.1-1mol% of polyvinyl pyrrolidone and 5-60mol% of methanol. In the application, the composite use of sodium propionate, glycine, polyvinyl pyrrolidone and methanol enhances the effect of a single inhibitor, the use range is more extensive, better inhibiting effect can be achieved at a lower concentration, and the generation of carbon dioxide hydrate can be better inhibited. The mixed use reduces the cost of the inhibitor, reduces the use amount of the mixture and weakens the toxicity and pollution of the inhibitor.

The present invention relates to a fermentationally produced propionate powder comprising: 25 wt.% to 60 wt.% of propionic acid equivalents; 3 wt.% to 16 wt.% of an acetic acid equivalent; 2 wt.% to 12 wt.% of a succinic acid equivalent; 0.1 mol to 0.8 mol of a Ca < 2 + > / mol propionate; 0 mol to 1.0 mol of a Na < + > / mol propionate; 0 mol to 1.0 mol of a K < + > / mol propionate; wherein 0.4 < = ([Na +] + [K +]) / [propionate] < = 1.4; 1.1 < = (2 [Ca < 2 + >] + [Na +] + [K +]) / [propionate] < = 2.8; [Ca < 2 + >] represents the concentration of Ca < 2 + > and takes mmol / g powder as a unit; [Na < + >] represents the concentration of Na < + >, and mmol / g powder is taken as a unit; [K < + >] represents the concentration of K < + >, and mmol / g powder is taken as a unit; [propionate] represents the concentration of propionate in mmol / g powder. These fermentationally produced propionate powders are superior to fermentationally produced propionate powders in which the majority of the propionate is composed of calcium, sodium or potassium propionate, in particular in terms of taste, odor and / or flow properties.

The invention discloses a method for detecting raw materials, impurities and products in a methylglycine trisodium diacetate reaction solution. The method comprises the following steps: respectively preparing a lactic acid, iminodiacetic acid, dimer and MGDA mixed standard substance solution, a sodium 2-chloropropionate standard substance solution and a sample solution, determining the solutions by utilizing high performance liquid chromatography, and calculating the contents of iminodiacetic acid, dimer, lactic acid MGDA and 2-chloropropionic acid in the sample solution according to a single-point external standard method; the calculation formula is as follows. The detection method is high in analysis accuracy, can be applied to central control analysis of the MGDA synthesis process, can be used for tracking the reaction process and material balance of the synthesis process for preparing MGDA from 2-chloropropionic acid, and is of great significance to quality control of MGDA.

The application discloses a method and application of sodium propionate for inhibiting Salmonella virulence factors, and comprises the following steps: inoculating Salmonella liquid into modified Martin culture medium for culture to obtain first bacterial liquid; inoculating the first bacterial liquid into new modified Martin culture medium for culture to obtain second bacterial liquid; centrifuging the second bacterial liquid, washing, and diluting by using modified Martin solution to obtain bacterial suspension; culturing the bacterial suspension and sodium propionate under certain conditions to obtain third bacterial liquid; and detecting the expression of virulence factors of Salmonella in the third bacterial liquid. It is found through detection that different concentrations of sodium propionate can significantly reduce the expression of Salmonella virulence factors. The method provided by the application can weaken the infection toxicity of Salmonella, so that the infection and incidence probability of poultry Salmonella can be reduced, and the infection symptoms can be alleviated.

The high-boiling-point low-conductivity ultralow-temperature secondary refrigerant comprises the following components in percentage by mass: 5%-10% of antifreeze protein, 8%-15% of weak conductive salt, 1%-3% of a low-temperature protective agent, 0.15%-2.1% of a pH regulator, 15%-25% of a high-boiling-point aid and the balance of water, the weak conductive salt is sodium acetate and sodium propionate; the low-temperature protective agent is a trehalose or protease inhibitor; the pH regulator is composed of citric acid and sodium hydroxide; the high-boiling-point auxiliary agent is ethylene glycol or propylene glycol. The finally prepared secondary refrigerant is not prone to layering and solidification at the ultralow temperature, higher in stability, capable of avoiding system pressure sudden rise caused by boiling of the secondary refrigerant at the high temperature, low in conductivity, capable of using electricity safely, capable of avoiding the risk of electric leakage, low in corrosion rate and capable of avoiding corrosion loss of a traditional acid / alkaline secondary refrigerant to equipment and prolonging the service life of a system.