74 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 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 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 .

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 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 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.

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 application relates to a kind of preparation methods of sodium bisulfite menadione, which is prepared by the reaction of 2-methyl-1,4-naphthoquinone and sodium bisulfite in the presence of K2O-MgO / Al2O3 as an aid in the mixed solution of organic solvent and water.The present application makes the conversion rate of raw materials >99% by introducing K2O-MgO / Al2O3 as an aid, the selectivity is greater than 95%, and can reduce the phenol, quinone impurities (content <800ppm) in the product.The process is simple, the reaction condition is mild, the process is stable, the purity of product is more than 98%, and the total yield is more than 94%.

The invention relates to the technical field of thermal power plant water treatment, in particular to a thermal power plant make-up water treatment method beneficial to reverse osmosis membrane anti-fouling and anti-blocking, which comprises the following steps: S1, Taihu Lake class II surface water is filtered by an adjustable grating and two-stage modified activated carbon, flow rate is controlled, and backwashing is carried out; s2, adding a temperature response type pretreatment agent according to TOC, and standing after ultrasonic stirring; s3, feeding the water into an electric field ultraviolet device, introducing hydrogen, and controlling the electric field, ultraviolet parameters and pH; s4, adding sodium hypochlorite, and adding sodium hydrogen sulfite when residual chlorine exceeds the limit; s5, after security filtration, feeding into a reverse osmosis membrane, controlling the pressure temperature and the water production rate, and performing regular flushing and cleaning. The method has the advantages of efficient reverse osmosis membrane pollution and blockage prevention, reduction of the use of chemical agents, reduction of the cost and environmental protection risk, improvement of the system stability, and demonstration significance to the industry.

The invention belongs to the technical field of pharmaceutical analysis, and discloses a method for simultaneously detecting sodium hydrogen sulfite and cysteine hydrochloride and application. Taking the concentrated solution for injection of edaravone dextroborneol, and detecting the content of an oxidizing agent by adopting high performance liquid chromatography; the oxidizing agent is sodium hydrogen sulfite and cysteine hydrochloride; a mobile phase of the high performance liquid chromatography is a 0.035% sodium heptanesulfonate solution and methanol in a volume ratio of (18-22): (78-82). According to the method, a normal-phase-mode universal chromatographic column is selected, and a proper amount of ion pair reagent is added into a reversed-phase chromatographic mobile phase, so that the retention of a sample can be enhanced, and the peak pattern can be improved. The method has remarkable advantages in specificity, linear range and repeatability, has the advantages of high specificity, high precision, high accuracy and the like, and provides an important method detection reference basis for antioxidant quality control of a concentrated solution product for edaravone dextroborneol injection.

The application discloses a teramycin ketoprofen injection and a preparation method thereof, and belongs to the field of veterinary injections, and is characterized by the following formula components: teramycin, ketoprofen, a catalytic factor, an antioxidant and an injection solvent; the catalytic factor is a polyamide amine dendrimer; and the antioxidant is a mixture of one or more than two of thio-glycerol, sodium metabisulfite or sodium bisulfite. The application has the beneficial effects that the teramycin and the ketoprofen are used in combination, no pH regulator is needed after the polyamide amine dendrimer is added, and an aqueous injection is obtained by the combination of the two, has a rapid effect, is rapidly absorbed after administration, has a short action time, can play a synergistic role in sterilization and inflammation, can not only increase the curative effect of a single drug, but also improve the drug stability and the bioavailability.

The application discloses a kind of polymeric quaternary phosphonium salt fungicides and its preparation method and application the method includes steps: S1, 3, 5-dihydroxyacetophenone, water, organic acid, organic phosphine reaction obtains intermediate product A;S2, brown intermediate product A is reacted in alcohol and halogenated hydrocarbon, and brown viscous product is obtained;S3, brown viscous product is dissolved in ester solvent, filtration is carried out, and the polymeric quaternary phosphonium salt fungicide monomer separated in filtrate is taken;S4, polymeric quaternary phosphonium salt fungicide monomer is added in water, and aqueous solution of potassium persulfate, aqueous solution of sodium bisulfite are sequentially added dropwise, and viscous liquid is obtained;S5, viscous liquid is filtered to obtain light yellow solid, and the light yellow solid is placed in oven and dried overnight, and polymeric quaternary phosphonium salt fungicide is obtained.The polymeric quaternary phosphonium salt fungicide of the application has killing effect on SRB, TGB and IB in oil-containing sewage, and has the advantages of low use concentration and high sterilization efficiency.

The invention discloses a method for detecting sodium hydrogen sulfite in a compound amino acid injection, which adopts high performance liquid chromatography for detection, and the chromatographic conditions are as follows: a chromatographic column adopts a hydrogen-type sulfonated crosslinked styrene-diethylbenzene copolymer as a filler; a mobile phase is a sulfuric acid aqueous solution; the elution mode is isocratic elution; and the detector is an ultraviolet detector. By adopting the high performance liquid chromatography detection method, the sodium hydrogen sulfite in the compound amino acid injection can be directly, conveniently, quickly, qualitatively or quantitatively detected, and the technical problems of low detection efficiency, complicated operation and the like in the prior art are solved; moreover, an ultraviolet detector is adopted for direct determination, so that the use of a derivative reagent is avoided, and the method has the advantages of environmental protection and convenience. The method provided by the invention has the advantages of strong specificity, high sensitivity, good linear relationship, high accuracy and good repeatability, and can be used for accurately judging the storage state and production quality of the compound amino acid injection.

The present application relates to a levetiracetam oral solution. Specifically, the present application provides a levetiracetam oral solution comprising levetiracetam, sucralose, polyethylene glycol 400, glycerol, lactose, mannitol, sorbitol, hydroxyethyl cellulose, citric acid, disodium hydrogen phosphate, sodium bisulfite and water. The levetiracetam oral solution of the present application can effectively mask the bitter taste of levetiracetam and its residues, thereby having excellent oral compliance, and the levetiracetam oral solution has excellent stability to light, high temperature and high humidity, can be divided and packed in transparent containers, is convenient for storage and transportation, ensures quality safety, and guarantees medication safety.

The present application belongs to the technical field of dressing reagent research and development, and particularly relates to a zinc sulfide inhibitor and a preparation method thereof; raw material components and weight fractions are as follows: 14-20 parts of direct black BN, 30-40 parts of sodium bisulfite, 30-50 parts of sodium thiosulfate, and the total weight of the raw materials is 100 parts. The present application has better effect than traditional inhibitors, can improve the pH value of the ore pulp while ensuring the flotation index, thereby reducing the corrosion damage of the flotation equipment, and can also alleviate the influence of acidic wastewater on the ecological environment of the mining area. The present application provides a new technology for efficient development of complex multi-metal zinc-containing mineral resources and separation of complex multi-metal mixed minerals, and also provides a new design direction for the use of combined inhibitors.

The invention discloses a composition for inhibiting color change of a whitening agent based on troxerutin. The composition is prepared from the following core active components in parts by mass: 0.1 to 0.5 part of syringyl malonic acid diethyl hexyl ester, 0.01 to 0.05 part of pentaerythritol tetra (bis-tert-butyl hydroxy hydrocinnamic acid) ester, 0.5 to 2 parts of troxerutin liposome and 0.05 to 0.5 part of toxostat; the composition does not contain any one or more of sodium pyrosulfite, sodium sulfite and sodium hydrogen sulfite; sulfate components are not used in the whole process, all the components are cosmetic-grade safe raw materials, skin irritation tests prove that the composition has no obvious irritation to people with sensitive skin and is wide in applicable people coverage, and the pain point that a traditional inhibitor is not friendly to sensitive skin is solved.

The invention relates to a chemical recovery technology of waste polyester, and provides a decolorization method of waste polyester alcoholysis liquid. The waste polyester is subjected to alcoholysis in ethylene glycol, part of ethylene glycol is removed under reduced pressure, the mass ratio of ethylene glycol to BHET is (1.5-4): 1, water and a hydroxyl carboxylic acid / hydroxyl carboxylic acid salt buffer system are added, the pH is adjusted to 4.5-6.5, a chlorite decolorizing agent matched with the content of ethylene glycol in alcoholysis liquid is added at the temperature of 100-140 DEG C in a segmented mode for decolorizing, and the waste polyester is obtained. And then reducing residual high-valence chloride anions by adopting a combination of sodium hydrogen sulfite and ascorbic acid, removing inorganic anions through strong-basicity anion exchange resin, and finally crystallizing to obtain the high-whiteness and high-purity BHET. The method has the advantages of low oxidant consumption, high decolorization efficiency, substantial reduction of chlorate residue, and reduction of side reactions.

According to the method, sodium sulfite and sodium pyrosulfite products are directly prepared by adding quicklime into sodium sulfate and mixed salt or mirabilite and introducing SO2 for double decomposition reaction, so that the technical problems of high alkali consumption and high energy consumption in the prior art are solved. At present, only a liquid sodium hydrogen sulfite product containing more impurities can be produced in the prior art, but the water content of the liquid sodium hydrogen sulfite is up to 60-65%, the liquid sodium hydrogen sulfite is inconvenient to store and transport, the use amount of the liquid sodium hydrogen sulfite is small, and the market application is less; however, direct preparation of high-purity anhydrous sodium sulfite or sodium pyrosulfite products by using liquid sodium hydrogen sulfite has the cost problems of high alkali consumption and high energy consumption, so that the preparation cost of sodium sulfite and sodium pyrosulfite is difficult to be high. If the use amount of alkali neutralization is reduced, the barrier that impurity ions such as calcium, magnesium and iron in the sodium sulfite and sodium metabisulfite products do not exceed the standard is difficult to overcome; sodium hydrogen sulfite is neutralized until the pH value is greater than or equal to 11.0, more than 99.0% of foreign ions can be removed, but alkali for neutralization accounts for 70.0-75.0% of the production cost of anhydrous sodium sulfite; therefore, the invention provides a process technical scheme for preparing sodium sulfite and sodium pyrosulfite with low cost and low energy consumption.

The invention discloses hydrophobically modified polyacrylamide capable of resisting interference of divalent ions. The hydrophobically modified polyacrylamide is prepared from the following components in parts by weight: 85 to 95 parts of acrylamide, 10 to 15 parts of 2-acrylamido-2-methylpropanesulfonic acid, 10 to 15 parts of octadecyl acrylate, 5 to 8 parts of urea, 0.01 part of EDTA-2Na (Ethylene Diamine Tetraacetic Acid), 0.04 part of potassium persulfate, 0.03 part of sodium hydrogen sulfite and 377 to 380 parts of deionized water. The invention also provides a preparation method of the polyacrylamide. The polyacrylamide provided by the invention not only can resist divalent ion interference, but also has a hydrophobic modification function, so that the wastewater treatment effect can be remarkably improved.

The invention discloses high-performance papermaking retention and drainage aid polyacrylamide, which is prepared from the following ingredients in parts by weight: 50 to 60 parts of acrylamide, 20 to 30 parts of methacryloyloxyethyl trimethyl ammonium chloride, 8 parts of styrene, 12 to 15 parts of sodium acrylate, 400 parts of deionized water, 0.02 to 0.03 part of isopropyl alcohol, 0.02 part of initiators V-50, 0.03 part of ammonium persulfate and 0.02 part of sodium hydrogen sulfite. The invention also provides a preparation method of the polyacrylamide. The polyacrylamide is prepared by adopting a composite initiation system and a gradient polymerization process, so that the stability of a paper pulp system can be remarkably enhanced, and meanwhile, the dehydration efficiency is greatly improved.

The invention is applicable to the technical field of feeds, and provides a special nutrient enrichment premix for boars and a preparation method thereof. The compound feed additive is prepared by compounding beta-carotene, 25-hydroxyvitamin D3, dl-alpha-tocopheryl acetate, menadione sodium hydrogen sulfite, ammonium sulfate nitrate, riboflavin, pyridoxine hydrochloride, cyanocobalamin, nicotinamide, D-calcium pantothenate, folic acid, D-biotin, L-ascorbic acid, DL-methionine, zinc methionine chelate, selenium yeast, chromium picolinate, L-carnitine and glucose according to a specific proportion. A dynamic batching and high-precision mixing process is adopted for preparation. Through the synergistic effect of various nutrients, the sow milk quality can be remarkably improved, the birth weight of piglets is increased by 50 g or above, the survival rate is increased by 6-8% or above, the weaning weight is increased by 500 g or above, meanwhile, the sow estrus rate is increased by 5% or above, the problems that sows are poor in body condition, low in reproductive performance, low in piglet survival rate and the like in existing boar breeding are effectively solved, and extremely high breeding application value is achieved.

The present application relates to the technical field of biological medicine, and particularly discloses a virus inactivation method and application. The virus inactivation method of the present application uses formaldehyde as an inactivator, and further includes a formaldehyde blocking step after the virus inactivation with formaldehyde. The active ingredients of the blocking agent used in the formaldehyde blocking step are sodium bisulfite and EDTA-2Na, and the mass ratio of the sodium bisulfite and the EDTA-2Na is (3.8-4.2):1. The method of the present application can effectively reduce the toxicity of formaldehyde when formaldehyde is used as an inactivator, and reduce the residual amount of formaldehyde, and is particularly suitable for the inactivation of bovine dermatophilus virus and the blocking of formaldehyde.

The invention relates to a method for improving sulfur-oxygen mixed type copper ore beneficiation technical indexes, and belongs to the technical field of flotation. According to the method, a compound vulcanizing agent is introduced for ore grinding, meanwhile, compound ethionocarbamate is used in cooperation to serve as a copper sulfide collecting agent, and the combination of the compound vulcanizing agent and triethylene tetramine serves as a copper oxide adjusting agent; according to the copper oxide collecting agent, the combination of compound ethionine ester, oleic acid and compound alkyl sodium hydroximate is used as the copper oxide collecting agent, so that the problems of unstable copper sulfide flotation liquid level structure and single agent effect of sulfur-oxygen mixed copper ore in a traditional flotation process are solved, and the technical defects of poor flotation index and low recovery rate of copper oxide ore are emphatically overcome, the components of the compound vulcanizing agent are sodium sulfide and sodium hydrogen sulfite, the components of the compound ethionocarbamate are n-butyl ethionocarbamate, propylene glycol, isoamyl xanthate and zinc chloride, and the components of the compound alkyl sodium hydroxamate are sodium isodecyl hydroxamate and sodium citrate.

The present application relates to waste polyester chemical recycling technology, provide a kind of waste polyester alcoholysis liquid decolorization method.Waste polyester is alcoholized in ethylene glycol and removes part of ethylene glycol under reduced pressure, so that the mass ratio of ethylene glycol and BHET is 1.5-4:1, water and hydroxyl carboxylic acid / salt buffer system are added, pH is adjusted to 4.5-6.5, and decoloring agent of chlorite salt matching with the ethylene glycol content of alcoholysis liquid is added in stages under 100-140 DEG C to decolor, then sodium bisulfite and ascorbic acid combination is used to reduce residual high-valence chlorine anion, and inorganic anion is removed by strong alkaline anion exchange resin, and finally high whiteness, high purity BHET is obtained by crystallization.The method has low oxidant dosage, high decoloring efficiency, can significantly reduce chlorate residue and reduce side reaction.

The utility model relates to the technical field of wastewater treatment, in particular to a saponification wastewater treatment system. Comprising a saponification wastewater pipeline, the saponification wastewater pipeline is connected with a wastewater buffer tank through a resin adsorption device, an acid pipeline and a sodium hydrogen sulfite adding mechanism are arranged on the wastewater buffer tank, the wastewater buffer tank is connected with a stripping tower, the top of the stripping tower is connected with a separation tank through a tower top condenser, and the bottom of the stripping tower is connected with a wastewater discharge tank. The waste water discharge tank is connected with the stock solution tank, the stock solution tank is connected with the heater through the bag filter, the condensate water preheater and the non-condensable gas preheater in sequence, the heater is connected with the separator, a liquid outlet of the separator is connected with the heater, the heater is connected with the washing tower, and the separator is connected with the cyclone, the thickener and the centrifugal machine. The washing tower is connected with the steam compressor through a steam return pipeline, the steam compressor is provided with the energy recycling system, and the saponification wastewater treatment system achieves the treatment goals of high efficiency, energy conservation and environmental protection, ensures that wastewater reaches the standard and is discharged, and meanwhile recovers valuable resources.

The application relates to a sample processing method for cervical exfoliative cell PCR detection, which adopts a sample processing reagent, including a processing liquid, a protection liquid, a conversion liquid, a first purification liquid, a second purification liquid, a third purification liquid and a collection liquid. The processing liquid contains 0.1-0.5N sodium hydroxide and 4-8mol / L urea; the protection liquid contains 1-8mM guanidine isothiocyanate, 0.1-5% SDS, 5-150mM Tris-Hcl and 5-100mM EDTA; and the conversion liquid contains 100-500mM sodium bisulfite, 50-250mM ammonium sulfite, 2-15M ammonium bisulfite, 0.1-3M tetrahydrofurfuryl alcohol, 1-5mM TEPA and 0.1-2M magnesium sulfite. The sample is lysed and protected by the processing liquid and the protection liquid, direct conversion and detection are facilitated, processing time and steps are saved, DNA loss is reduced, cost is saved, the accuracy and reliability of detection results are ensured.

The invention provides an m-boron phenylalanine injection for boron neutron capture therapy. The injection is prepared from an active ingredient m-BPA and pharmaceutically acceptable auxiliary materials, the concentration of the m-BPA is 25-35 mg / mL, and the auxiliary materials comprise an antioxidant and a pH regulator; the antioxidant is sodium hydrogen sulfite, and the concentration of the antioxidant is 0.1-0.3 mg / mL; the pH regulator is a 0.1-0.5 mol / L sodium hydroxide solution or hydrochloric acid solution, and the pH value of the injection is 7.4-7.8. The core of the invention is to provide the solubilizer-free m-BPA injection, the risk related to the solubilizer is avoided by utilizing the high solubility (125 g / L) of the m-BPA, the injection is suitable for conventional clinical treatment and hereditary fructose intolerant patients, is high in safety and free of crystallization urine risk, is suitable for special crowds, and meanwhile, a mature clinical dosage scheme is continued to be used to ensure the BNCT curative effect.

This invention discloses a refining process and equipment for high-concentration sulfur dioxide byproducts of chemical production tail gas, relating to the field of chemical tail gas treatment and resource recovery technology. The process includes pretreatment, adsorption and regeneration, extractive distillation, double-effect distillation, and finished product collection. In this invention, micro-oxygen pre-removal utilizes the reaction of sodium bisulfite with oxygen to remove trace amounts of oxygen from the tail gas. Simultaneously, the crystals precipitated from the reaction capture residual micron-sized acid mist, blocking the sulfite oxidation side reaction at its source and preventing equipment scaling and clogging. Gradient reverse adsorption changes the gas flow direction, matching different concentrations of impurities to corresponding adsorbents, achieving synchronous saturation of each adsorption layer and improving adsorbent utilization. Pressure swing extractive distillation sets different pressure ranges within a single tower to increase the relative volatility of carbon disulfide and sulfur dioxide, enhancing the separation of difficult-to-separate impurities. Finally, a four-stage separation system is constructed to remove impurities of different properties at each stage for progressive depth removal.

This invention discloses a highly efficient, non-foaming, and environmentally friendly surfactant, its preparation method, and its applications. The preparation method involves dissolving maleic anhydride and a monohydric saturated alcohol in N,N-dimethylformamide at a 1:1 molar ratio, heating and stirring to esterify and obtain a carbon-carbon double-bond intermediate; adding an aqueous solution of sodium bisulfite and a co-solvent to the system, heating and sulfonating to add the sulfonate, and then concentrating, filtering, drying, and grinding to obtain a powdered product. The prepared surfactant exhibits excellent thermal stability, with a weight loss of only 0.96 wt% at 178℃, ensuring its molecular structure remains intact during MH formation and guaranteeing long-term stable promoting effects; the interfacial tension and contact angle can be reduced to 16.13 mN / m and 31.5°, respectively, significantly improving the gas-liquid mass transfer efficiency during MH formation; at a concentration of 0.3 wt%, the MH gas storage capacity is 171.03 V / V, the hydrate conversion rate is 85.42%, the induction time is 2.5 min, there is no foaming, and rapid dissociation occurs within 55 min; it has no significant inhibition of Escherichia coli growth and exhibits excellent environmental friendliness.