173 results about "Sodium bisulfite" patented technology

The invention relates to the technical field of oilfield chemistry, and discloses a graft modified cellulose filtrate reducer and a preparation method thereof.The preparation method comprises the following steps that modified hydroxyethyl cellulose, 2-acrylamide-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, alkenylated cardanol and N, N '-methylene bisacrylamide are added into deionized water, stirring is conducted, and a mixture is obtained; the preparation method comprises the following steps: adding cellulose into a reaction kettle, stirring for 10-15 minutes at the temperature of 40-60 DEG C at the speed of 300-400 rpm, dropwise adding ammonium persulfate and sodium hydrogen sulfite into a system, and continuously reacting for 4-6 hours to obtain the grafted modified cellulose filtrate reducer. The filtrate reducer disclosed by the invention has good high temperature resistance and salt resistance.

The invention relates to the technical field of preparation of surfactants, in particular to a PPO / PEO block Gemini ductile surfactant suitable for high-temperature and high-salt oil reservoirs and a preparation method of the PPO / PEO block Gemini ductile surfactant. The preparation method comprises the following steps: by taking fatty alcohol as an initial raw material, carrying out gradual addition on the fatty alcohol, propylene oxide (PO) and ethylene oxide (EO) through a potassium hydroxide / 18-crown ether-6 catalytic system to prepare an APOnEOm intermediate; the preparation method comprises the following steps: carrying out esterification with a polyethylene glycol bismaleate connecting group, and finally sulfonating with sodium hydrogen sulfite to obtain polyethylene glycol bismaleate diester sodium sulfonate (T-APOnEOm-S). By regulating and controlling the PPO / PEO block ratio, the product has excellent temperature resistance and salt resistance, is suitable for high-temperature and high-salt oil reservoirs, has strong emulsifying capacity, can reduce the oil-water interfacial tension to 10 <-3 > mN / m level, and remarkably improves the oil recovery rate. The preparation process is mild in condition and adjustable in product performance, and has important application value in the field of tertiary oil recovery.

The invention belongs to the technical field of sewage treatment, and particularly relates to a demulsifier for eliminating an oil-water interface emulsion layer in oilfield produced liquid treatment and a preparation method of the demulsifier. The preparation method comprises the following steps: adding acrylamide, 1-allyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imine salt, allyl tributyl phosphonium chloride and deionized water into a first reactor, and heating and dissolving the acrylamide, the 1-allyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imine salt, the allyl tributyl phosphonium chloride and the deionized water; adding allyl (diisopropylamino) dimethylsilane, butyl acrylate, deionized water, octylphenol polyoxyethylene ether-10, lauryl sodium sulfate and monopotassium phosphate into the second reactor, and stirring to obtain an emulsion; adding an initiator and sodium hydrogen sulfite into a second reactor, carrying out heating and heat preservation reaction, pouring the mixed solution in the first reactor, and continuously carrying out reaction, heating and heat preservation to obtain a viscous liquid; and drying and granulating the viscous liquid to obtain the demulsifier. The demulsifier provided by the invention has the characteristics of simple synthesis process and high demulsification rate.

The invention discloses a multi-dimensional rapid evaluation method for snow-melting agent corrosion resistance of stainless steel, and relates to the technical field of stainless steel performance evaluation.The multi-dimensional rapid evaluation method comprises the steps that sodium chloride, calcium chloride and magnesium chloride are weighed by mass and dissolved in deionized water, acetic acid and sodium hydrogen sulfite are added after dissolution, and the pH value is adjusted to 4-6; performing potentiodynamic polarization scanning and electrochemical impedance spectroscopy testing on the stainless steel sample to obtain pitting potential and impedance modulus; the method comprises the following steps: placing a stainless steel sample in a cyclic corrosion experiment box, carrying out a corrosion experiment under the conditions of controlling the cyclic temperature change of an environment temperature and periodically carrying out cyclic switching of a spraying mode, a humid mode and a drying mode, taking out the sample every set time, and measuring the corrosion rate and the maximum pitting depth; and according to the pitting potential, the impedance modulus, the corrosion rate and the maximum pitting depth, carrying out graded judgment on the corrosion resistance of the stainless steel. According to the method, the corrosion resistance of the stainless steel can be accurately evaluated in a short time.

The application provides a weathering steel surface rust layer stabilizing treatment agent for industrial atmospheric environment, and the chemical composition of the weathering steel surface rust layer stabilizing treatment agent is as follows in terms of mass fraction: 25-45% of acrylic resin, 2.0-6.0% of chromium sulfate, 3.0-8.0% of ferrous oxide, 2.0-6.0% of ferric oxide, 0.5-3.5% of copper sulfate, 0.3-1.5% of sodium bisulfite, 1.0-6.0% of sodium molybdate, 0.5-3.5% of nickel sulfate, 2.0-5.0% of potassium phosphate, 0.05-0.5% of surfactant, 0.05-0.5% of defoaming agent, 0.05-0.5% of dispersing agent, 0.05-0.5% of thickening agent, and the balance is water, wherein the amount of plasticizer added is 2-5% of the resin. The stabilizing treatment agent in the application can promote the weathering steel surface to form a stable and dense rust layer within 0.5-1 year after the surface of the weathering steel is treated before use.

The invention provides a high slump loss resistant aliphatic water reducer with a branched structure and a controllable polymerization preparation method of the high slump loss resistant aliphatic water reducer. The water reducing agent is prepared from the following components in parts by weight: 14 to 24 parts of acetone, 19 to 29 parts of formaldehyde, 7.5 to 11.5 parts of sodium hydrogen sulfite, 3.5 to 6.5 parts of four-arm star-shaped low-carbon hydrophobic core, 2.5 to 5.5 parts of amide-ester bifunctional slow-release monomer, 2.0 to 4.5 parts of zwitter-ion-phosphonic acid based clay inhibitor and 60 to 90 parts of deionized water. The obtained water reducing agent has good initial dispersibility, stable adsorbability, excellent slump loss resistance and relatively strong clay interference resistance.

The utility model discloses an ethylene oxide absorption dealdehyding system in the field of dealdehyding, which comprises an ethylene oxide absorption tower, and the bottom of the ethylene oxide absorption tower is connected with a desalting delivery pump, a 20% sodium hydroxide solution metering pump and a dealdehyding buffer tank through pipelines. The dealdehyding buffer tank is further connected with a sodium hydrogen sulfite solution metering pump and a quenching stripping tower through pipelines, the top of the dealdehyding buffer tank is provided with a first EO re-absorption tower connecting pipe, the desalting delivery pump is connected with a cooler through a pipeline, the cooler is connected with an ethylene oxide absorption tower through a pipeline, and the ethylene oxide absorption tower is connected with a second EO re-absorption tower through a pipeline. And desalted water equipment is mounted on a pipeline between the cooler and the ethylene oxide absorption tower through a three-way valve. The dealdehyding resin is adopted for dealdehyding of the lean absorption water part, sodium sulfite is added to the quenching section of the EO absorption tower for dealdehyding, and then flash evaporation is performed, so that the content of aldehyde in the lean absorption water can be effectively reduced, and the content of aldehyde in an EO absorption system can be effectively reduced.

The invention relates to hydrolysis-resistant polyacrylamide gel, which relates to the technical field of high polymer materials and comprises the following components in parts by mass: 50 to 70 parts of composite acrylamide monomer, 10 to 20 parts of comonomer, 0.75 to 1.5 parts of initiator and 3 to 8 parts of stabilizer. The hydrolysis-resistant polyacrylamide gel is prepared by the following steps: dispersing a composite acrylamide monomer, a comonomer and a stabilizer into a solvent, and stirring to obtain a mixed solution; the preparation method comprises the following steps: respectively preparing an initiator ammonium persulfate solution and a sodium hydrogen sulfite solution into aqueous solutions, sequentially adding the ammonium persulfate solution and the sodium hydrogen sulfite solution at intervals under the conditions of neutral gas protection and stirring, and carrying out a stirring reaction to obtain a gel solution; and pouring the gel solution into a mold, heating, standing, curing, taking out, and washing to obtain the hydrolysis-resistant polyacrylamide gel. The polyacrylamide gel has the effect of improving the hydrolysis resistance of the polyacrylamide gel, and the gel has high strength and good stability.

The invention discloses a preparation method and application of a copper powder sintered filter with the surface grafted with antibacterial hydrogel. Firstly, dopamine is used for carrying out surface treatment on the copper powder sintered filter to form a layer of protective film, so that corrosion is prevented, and the protective film can be tightly combined with later hydrogel. The preparation method comprises the following steps: soaking a filter sheet treated by dopamine into an aqueous solution of acrylamide, water-soluble polymer, N, N-methylene bisacrylamide and ammonium persulfate, then adding a mixed aqueous solution of silver nitrate and sodium hydrogen sulfite, uniformly mixing the solution under stirring, and rapidly catalyzing ammonium persulfate by silver ions to generate free radicals to initiate polymerization of acrylamide, so as to obtain the water-soluble polymer filter sheet. Sodium hydrogen sulfite and ammonium persulfate continue to initiate polymerization of acrylamide, the copper powder sintered filter is taken out and cross-linked through calcium nitrate, and the copper powder sintered filter with the antibacterial hydrogel grafted on the surface is obtained and applied to removal of emulsified oil and algae. Part of silver ions in the hydrogel react with copper to obtain nano-silver, and the hydrogel is endowed with good antibacterial performance.

The invention relates to a reverse osmosis membrane and a membrane assembly, in particular to the technical field of reverse osmosis membranes, and discloses a preparation method of a high-pressure-resistant reverse osmosis membrane, which comprises the following steps: immersing a porous support base membrane in a water phase solution containing 0.8-2.5 wt% of m-phenylenediamine, 0.05-0.1 wt% of carboxylated hyperbranched nanoparticles and 0.03-0.1 wt% of a nonionic surfactant for 90-150s; removing redundant aqueous phase solution, and then transferring into an oil phase n-hexane solution containing 0.05 to 0.5 weight percent of trimesoyl chloride and 0.05 to 0.2 weight percent of aminated MOFs (Metal-Organic Frameworks) to react for 45 to 75 seconds; performing heat treatment at 65 to 75 DEG C for 10 to 15 minutes; 0.5-2.0 wt% of a sodium hydrogen sulfite aqueous solution is adopted for post-treatment and curing to form the film. According to the preparation method, carboxylated hyperbranched nanoparticles are introduced into a water phase, and aminated MOFs are introduced into an oil phase, so that a rigid-flexible coupled nanometer enhanced interface is constructed; meanwhile, post-crosslinking and sodium hydrogen sulfite chemical curing are utilized to form a compact, tough and high-mechanical-strength PA functional layer. After the obtained membrane continuously runs for 48 hours at 150 bar, the membrane returns to 55 bar for testing, and the water flux attenuation amplitude is 1t; the retention rate of NaCl is greater than or equal to 99.5%.

The application discloses a kind of high-altitude area weathering bridge steel member rust layer stabilizing treatment agent and use method, mainly solve the rust layer of high-altitude area weathering bridge steel member is difficult to stabilize and surface rust layer color is not uniform, rust liquid flow and other problems.The stabilizing treatment agent is composed of fast rusting agent and rust layer stabilizer, the fast rusting agent is composed of ferric chloride, copper sulfate, hydrogen peroxide, ethylene glycol and deionized water, the rust layer stabilizer is composed of sodium polyphosphate, sodium bisulfite and methanol and deionized water.The treatment agent of the application is suitable for the harsh environment of low temperature, oxygen is rare, inorganic salt system treatment agent is prone to icing in high sea area, the surface of high-altitude area weathering bridge steel member after processing forms brown rust layer with uniform color, no rust liquid flow.The rust layer of weathering bridge steel member can be stabilized within 8 hours by using the application, the thickness of the rust layer after processing is greater than or equal to 50 μm, the surface rust layer color difference value ΔE of different parts of the component is less than or equal to 10, and the amount of surface rust layer of the component is greater than or equal to 15 g / m 2 .

The invention provides a composition for preservation of vitamin D and vitamin K, an alternative matrix and application, and relates to the technical field of detection reagents. The composition comprises 0.5-3 mol / L of sodium pyrosulfite, 0.5-3 mol / L of sodium hydrogen sulfite and 0.5-3 wt% of lipoprotein lipase, and the technical problems that vitamin D and vitamin K are unstable and prone to failure are solved.

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 provides a tin deposition agent, a preparation method and application. The tin depositing agent comprises the following components: 12-18 g / L of tin methanesulfonate; 120 to 160 g / L of methanesulfonic acid; 30-60 g / L of a complexing agent; the compound stabilizer is prepared from 1 g / L to 5 g / L of trimethylglycine, 0.05 g / L to 1 g / L of phosphonate and 0.5 g / L to 3 g / L of sodium hydrogen sulfite; 50 to 150 mg / L of a wetting agent; and 50 to 150 mg / L of an emulsifier. The tin immersion agent is high in tin immersion rate, has excellent deoiling resistance, can effectively avoid the problems of solder mask falling, local welding refusal or bare copper exposure and the like in the tin immersion process, and can meet the requirements of industrial large-scale production.

This invention belongs to the field of alcoholic beverage processing technology, specifically relating to a high-purity ginkgo wine and its preparation method. The preparation method comprises the following steps: ginkgo slurry undergoes preliminary enzymatic hydrolysis with neutral protease and amylase, followed by secondary enzymatic hydrolysis with pectinase and sodium bisulfite; brewing yeast fermentation broth is added for pre-fermentation; glutamine transaminase, *Saccharomyces cerevisiae* fermentation broth, and *Candida valerate* fermentation broth are added for post-fermentation; and finally, distillation and filtration are performed to obtain the ginkgo wine. This invention achieves complete decomposition and fermentation of ginkgo kernels through a two-step enzymatic hydrolysis and two-step fermentation process. The preparation method has advantages such as simple process and low cost, which is beneficial for industrial production; the prepared ginkgo wine has advantages such as clarity, strong aroma, high alcohol content, and low acidity.

The invention relates to a method for recycling selenium and tellurium from copper anode slime copper separation liquid step by step, and aims to solve the technical problems that pyrogenic separation is needed after selenium and tellurium are extracted, and the treatment process flow is long. According to the technical scheme, the method comprises the following steps: (1) heating, concentrating, cooling and filtering the copper anode slime copper separation liquid; (2) detecting the content of selenium and tellurium; (3) carrying out sodium hydrogen sulfite reduction on filtrate I to extract selenium; (4) chlorinating filtrate II and then reducing to obtain crude tellurium; after the copper separation liquid is treated step by step, step-by-step recovery of selenium and tellurium in the copper separation liquid is achieved through a one-step method, the recovery process of selenium and tellurium is shortened, the recovery rate of selenium and tellurium in the copper anode slime is increased, and the economic benefits of smelting plants are improved.

The application discloses a kind of polymer oil displacement agent for carbonate fractured-vug type reservoir and preparation method thereof, step 1, with acetone and ethanol mixed solution as solvent, N, N-dimethylpropylene diamine, diethyl ether and perfluorinated nonanoic acid are added into acetone-ethanol mixed solution, after complete reaction, chloropropene is added, continue to react, after reaction is finished, solvent is removed by evaporation, to obtain fluorocarbon cation hydrophobic monomer CF-1;Step 2, white oil, emulsifier Span80 and Tween80 with mass ratio of 35-45:1-3:1-2 are mixed uniformly to obtain oil phase;AM, sodium p-styrenesulfonate and fluorocarbon cation hydrophobic monomer CF-1 are dissolved in deionized water, sodium bisulfite is added, and stirred uniformly to obtain aqueous solution;The aqueous solution is added to the oil phase to obtain a uniform emulsion, ammonium persulfate is added, and the polymer oil displacement agent is obtained by reaction. It has higher temperature resistance and salt resistance, and greatly reduces the adsorption of carbonate reservoir on the oil displacement agent.

The invention discloses a cinnamyl aldehyde derivative-based 1-hydroxy-1-sodium sulfonate structural compound as well as a preparation method and application thereof, and belongs to the technical field of preparation of agricultural chemicals. The structural general formula of the compound is shown as a formula (I). The preparation method of the compound comprises the following steps: dropwise adding a homogeneous phase B system consisting of sodium hydrogen sulfite, a quaternary phosphonium salt phase transfer catalyst and water into a homogeneous phase A system consisting of a compound shown in a formula (II) and an organic solvent, and carrying out nucleophilic addition reaction to obtain the compound shown in the formula (I). The preparation method is simple, reaction conditions are mild, and the obtained compound is good in environmental compatibility, has high biological activity on soil pathogens (bacteria, fungi, root-knot nematode and the like), can be widely applied to prevention and treatment of soil-borne diseases, and provides material guarantee for safe production of crops.

This invention discloses an energy-enhancing water-based fracturing fluid, its preparation method, and its application, relating to the field of oilfield fracturing fluid technology. The preparation method includes: adding N,N-dimethylformamide as a solvent, then adding 2,3-epoxypropyl octadecenoic acid and acetic acid, followed by post-treatment to obtain solid intermediate monomer I; mixing sodium bisulfite with water and adding monomer I, along with an appropriate amount of catalyst, followed by treatment after the reaction to obtain intermediate monomer II; adding a zirconium salt solution of zirconium oxychloride dropwise to the monomer II solution and adjusting the pH to obtain a crosslinking agent. The crosslinking agent is then added to a guar gum thickener for crosslinking to obtain the fracturing fluid. The fracturing fluid uses viscosity-reducing molecules as ligands to synthesize an organozirconium crosslinking agent. During the crosslinking process, the original coordination bonds in the crosslinking agent break, releasing viscosity-reducing molecules, thereby enhancing the strength, solubility, and emulsifying and dispersing ability of the crosslinking agent. This imparts viscosity-reducing capabilities to the fracturing fluid, simplifying the process, shortening the time, and improving efficiency.

The application belongs to the technical field of medicine, and relates to a compound composition, a preparation method and application, in particular to a compound sodium salicylate composition for treating acute pancreatitis and a preparation method. The compound sodium salicylate composition comprises quercetin, diammonium glycyrrhizinate and sodium salicylate, wherein the mass ratio of quercetin, diammonium glycyrrhizinate and sodium salicylate is 1-5:5-20:50-200. When the compound sodium salicylate composition is an injection, it comprises quercetin, diammonium glycyrrhizinate, sodium salicylate, 1,2-propanediol, sodium bisulfite, dimethyl sulfoxide and 0.9% sodium chloride injection. The volume ratio of 1,2-propanediol and dimethyl sulfoxide in the injection is 14-20% and 0.25-1% respectively; and the mass / volume ratio of sodium bisulfite in the injection is 0.1-0.3%. The compound sodium salicylate composition can significantly reduce amylase, lipase, IL-6 and IL-1beta, and can be used for preparing a medicine for treating pancreatitis.

The invention discloses a hydrophobic monomer copolymer oil-displacing agent with a demulsification function and a preparation method, and relates to the technical field of oilfield chemistry. The preparation method comprises the following steps: stirring a linear block polyether demulsifier and sodium hydroxide for reaction under a high-temperature condition; the preparation method comprises the following steps: preparing a linear block polyether demulsifier, stirring the linear block polyether demulsifier with p-chloromethyl styrene which is equal to the linear block polyether demulsifier in mole to react to obtain a hydrophobic monomer A with a demulsification function, dissolving the hydrophobic monomer A, acrylamide, potassium persulfate and VA-044 in a deionized water solution to obtain a reaction solution, introducing nitrogen to remove oxygen, adding sodium hydrogen sulfite, and carrying out adiabatic reaction until the temperature of the system is not increased any more; and crushing a polymer rubber block obtained after the reaction is completed, hydrolyzing in a sodium hydroxide solution, drying, and crushing. The oil-displacing agent contains a block polyether demulsifier structural unit, has better temperature resistance compared with linear high-molecular-weight hydrolyzed polyacrylamide and common hydrophobic modified polyacrylamide, and has no negative influence on demulsification and dehydration of crude oil emulsion.

The invention discloses a water-based modified amine curing agent and a preparation method thereof. Cardanol is first epoxidized, then sodium bisulfite is used as a sulfonating agent to sulfonate the epoxidized cardanol, and then the sulfonated modified cardanol, polyamine, silane coupling agent KH-550 modified nano-silica and formaldehyde are subjected to a Mannich reaction to obtain a water-based modified amine curing agent. The water-based modified amine curing agent of the present invention is suitable for a water-based epoxy coating system, has the characteristics of good dispersibility and fast curing speed, and the coating formed after curing has excellent mechanical properties and anti-corrosion properties.

The invention relates to the technical field of building materials, and discloses an anti-aging impact-resistant S-shaped filter brick and a preparation method thereof. The preparation method comprises the following steps: mixing kaolin and diatomite, and modifying with vinyltrimethoxysilane to obtain double-bonded composite soil; taking water, sodium hydrogen sulfite, L-ascorbic acid, ammonium persulfate, acrylic acid, triallyl quaternary ammonium salt and the double-bond composite soil, stirring for reaction, filtering, washing and drying to obtain polyacrylic acid modified composite soil; and adding the polyacrylic acid modified composite soil into dimethyl sulfoxide, adding N, N-carbonyldiimidazole, heating to 60-65 DEG C, stirring for 8-12 hours, adding hydroxy propyl cellulose, magnetically stirring at 90-95 DEG C for 3-5 hours, filtering, washing and drying to obtain the modified composite soil. And stirring and mixing the ceramic powder particles, the glycerol modified zeolite, the modified composite soil, cement, a water reducing agent and water, pouring the mixture into an S-shaped filter brick mold, and performing compression molding and maintenance to obtain the anti-aging and impact-resistant S-shaped filter brick.

The invention relates to the technical field of medical abdominal pads, and discloses an anti-leakage multi-layer composite medical abdominal pad which comprises a top coating layer, a bottom anti-leakage layer and a liquid absorption core body arranged between the top coating layer and the bottom anti-leakage layer. The anti-leakage composite absorption resin is prepared by polymerizing and treating the following raw materials in parts by weight: 100 parts of acrylic acid which is neutralized by sodium hydroxide until the neutralization degree is 70-75 mol percent; 5.0 to 8.0 parts of an attapulgite powder body; 1.0 to 1.5 parts of citric acid; 0.01 to 0.05 part of p-methoxyphenol; 0.1 to 0.3 part of N, N '-methylene bisacrylamide; 0.1 to 0.15 part of ammonium persulfate; sodium hydrogen sulfite; and a surface crosslinking system. By constructing an inorganic framework and a cross-linked shell, the gel strength of the resin is improved, and the problem of reverse osmosis of the abdominal pad under pressure is solved; and in cooperation with core body compaction and hot melting edge sealing processes, lateral leakage of internal body fluid is blocked.

The application relates to the technical field of oilfield chemicals, and discloses a temperature-resistant and salt-resistant cationic hydrophobic association polymer as well as a preparation method and application thereof. Components of the polymer are acrylamide, N,N-dimethyl-N-methyl acryloyloxyethyl-N-2-hydroxy-1-octadecylamino propyl ammonium chloride, ammonium persulfate, sodium bisulfite, a fatty alcohol polyoxyethylene ether and a solvent. The application chemically synthesizes specific amounts of acrylamide, N,N-dimethyl-N-methyl acryloyloxyethyl-N-2-hydroxy-1-octadecylamino propyl ammonium chloride, ammonium persulfate, sodium bisulfite and the fatty alcohol polyoxyethylene ether, and can prepare the polymer with high thickening efficiency. The polymer has good thickening performance, a small critical association concentration, excellent temperature resistance and salt resistance, and can be applied to unconventional oilfields. The product produced by the preparation method has low residual monomer content, the preparation process is simple, the cost is low, the operation is easy, the pollution is small, and the product is easy to be industrially produced.

This invention belongs to the technical field of cell preservation, specifically relating to a clinical cryopreservation solution for canine natural killer cells, its preparation method, and its application. The invention uses physiological saline as a solvent and dextran 40, a complex amino acid, canine serum albumin, canine interleukin-2, and sodium bisulfite as active ingredients. The complex amino acid includes three or more of leucine, isoleucine, phenylalanine, threonine, tryptophan, methionine, glycine, lysine hydrochloride, arginine, histidine, and valine. The cell cryopreservation solution provided by this invention is free of serum and DMSO, has a stable and safe composition, and the components work synergistically to provide a stable survival environment for canine natural killer cells. After preservation at 4℃~8℃ for 72 hours, the viability of canine natural killer cells can be maintained at over 80%, achieving in vitro preservation of canine natural killer cells while retaining good killing activity against canine mammary tumor cells.

This invention relates to the field of flocculant technology, and discloses a polyacrylamide flocculant for sludge treatment and its preparation process. The polyacrylamide flocculant for sludge treatment prepared by this invention comprises the following raw materials: water, modified starch, prepolymer, and bromoethane; the prepolymer includes butyl acrylate, water, sodium dodecyl sulfate, acrylamide, N,N-methylenebisacrylamide, glycidyl methacrylate, modified silica, ammonium persulfate, and sodium bisulfite; the modified silica includes vinyltriethoxysilane-modified nano silica; the modified starch includes corn starch, N,N'-(1,2-ethanediyl)bisaspartic acid, sodium alginate, water, sodium sulfate, and phosphorus oxychloride; the obtained polyacrylamide flocculant for sludge treatment has a high molecular weight hyperbranched structure and good flocculation effect.

A system for wastewater treatment employing in-situ cleaning of electrodes, comprising: at least one reactor for treating wastewater, said wastewater comprising chloride salts (sodium chloride, potassium chloride, calcium chloride, etc.) with a chloride concentration between 500 mg / L to 5,000 mg / L; and a controller for controlling the current supplied to the reactor by controlling the electrode active area and / or current density, such that the total amount of aqueous free chlorine produced during the wastewater treatment requires the addition of a certain amount of sodium bisulfite determined experimentally to produce a treated wastewater with a concentration of hydrochloric acid between 500 mg / L and 5,000 mg / L and a pH less than or equal to 4. After the addition of sodium bisulfite in the treated wastewater, the wastewater is recirculated back into the reactor. This ensures in-situ cleaning of the electrodes within the electrochemical reactor without the need for any additional equipment.

The present invention discloses a high-efficiency and environmentally friendly low-temperature gel breaker for shallow oil and gas wells and a method of use, and relates to the technical field of chemicals for oil and gas well fracturing. When preparing the high-efficiency and environmentally friendly low-temperature gel breaker for shallow oil and gas wells, the present invention first reacts and polymerizes acrylic acid, acrylamide, sodium lignin sulfonate, polyvinyl alcohol, and a cross-linking agent, and then loads oxalic acid to prepare a slow-release capsule core; glutaraldehyde is reacted with sodium carboxymethyl cellulose, and then added to the slow-release capsule core for impregnation, and dried to obtain a catalytic slow-release capsule; persulfate, sodium thiosulfate, sodium bisulfite formaldehyde solution, a chelating agent, sodium nitrite, ammonium chloride, and a catalytic slow-release capsule are added to pure water and mixed evenly to obtain the high-efficiency and environmentally friendly low-temperature gel breaker for shallow oil and gas wells. The high-efficiency and environmentally friendly low-temperature gel breaker for shallow oil and gas wells prepared by the present invention has the advantages of self-heating, thorough gel breaking, no heavy metal ion pollution, and no impact on fracturing construction.

The invention relates to the technical field of high polymer material preparation, in particular to a preparation method of pourable super absorbent resin for building backfill layer accumulated water treatment. Comprising the following steps: obtaining surface aminated nano SiO2; the preparation method comprises the following steps: adding 0.05-10 parts of surface aminated nano SiO2 and 0.1-10 parts of a natural polyphenol compound into 100 parts of distilled water, and stirring; after the mixture is uniformly stirred, a Tris-HC1 buffer solution is dropwise added; after the reaction is completed, centrifugally separating and collecting a product to obtain a nano SiO2 hybrid; the preparation method comprises the following steps: adding 0.05-10 parts of a nano SiO2 hybrid into 100 parts of distilled water, carrying out ultrasonic dispersion for 0.5-2 hours, and slowly adding 10-30 parts of a vinyl monomer and 5-20 parts of sodium hydroxide; 0.01 to 0.1 part of ammonium persulfate and 0.01 to 0.1 part of sodium hydrogen sulfite are added; 0.05-2 parts of a post-crosslinking agent is added into the polymer solution, the pourable super absorbent resin is obtained, in this way, accumulated water of the backfill layer is efficiently absorbed, the backfill material is effectively solidified to form a stable waterproof barrier, and fixed-point and efficient treatment of the accumulated water of the backfill layer can be met.