296 results about "Sodium formate" patented technology

A long-term fire retarding biochemical liquid composition including: a dispersing agent realized in the form of a major amount of water, for dispersing alkali metal ions dissolved in the water; a major amount of a first fire retarding agent realized in the form of a primary alkali metal salt of a nonpolymeric saturated carboxylic acid, for example, tripotassium citrate, for providing metal potassium ions dispersed in the water when the at least one alkali metal salt is dissolved in the water to form a mixed retardant solution; a minor amount of a second fire retarding agent realized in the form of a secondary alkali metal salt of a nonpolymeric saturated carboxylic acid, for example, potassium, sodium, calcium and / or magnesium benzoate, for providing benzoate ions dispersed in the water when the secondary alkali metal salt is dissolved in the mixed retardant solution, for functioning as a secondary fire retardant agent.

An integrated energy system comprising a power plant including at least one nuclear reactor and electrical power generation system, the at least one nuclear reactor being configured to generate steam, and the electrical power generation system being configured to generate electricity, a desalination system configured to receive at least a portion of the electricity and steam to produce brine, an electrolysis process configured to process the brine into Sodium Hydroxide (NaOH), a Sodium Formate (HCOONa) production process configured to receive the Sodium Hydroxide (NaOH) to produce Sodium Formate (HCOONa), a Hydrogen (H2) extraction reactor configured to receive the Sodium Formate (HCOONa) and produce Hydrogen (H2), and a fuel cell configured to receive the Hydrogen (H2).

The invention discloses an efficient wet desulfurization synergist and a preparation method thereof, and relates to the technical field of flue gas desulfurization. The efficient wet desulphurization synergist comprises the following raw materials in parts by weight: 10-20 parts of sodium formate, 5-10 parts of citric acid, 20-30 parts of binary acid, 5-6 parts of a surfactant, 15-20 parts of magnesium salt, 12-18 parts of sodium salt and 2-5 parts of a pH buffer agent. The preparation method comprises the following steps: reacting cyanuric chloride with lauryl amine to generate a monosubstituted compound; then reacting with L-asparaginic acid to generate a disubstituted compound; reacting with diethylenetriamine to generate a bis-triazine ring compound; and finally, reacting with sodium 2-chloroethanesulfonate to generate the surfactant. The high-efficiency wet desulphurization synergist prepared by the invention has a desulphurization effect.

This invention relates to the field of water treatment technology, specifically to a reverse osmosis membrane cleaning agent composed of a non-oxidizing bactericide and an enzyme, and its application. Its main purpose is to remove biofouling from reverse osmosis membranes and restore membrane flux. This patent discloses a novel reverse osmosis membrane cleaning agent formulation. Considering the different pH requirements of the cleaning agent in actual production, different types of bioactive hydrolytic enzymes are selected to disrupt the structure of bacterial cell walls and their extracellular polymers. A reducing agent and a non-oxidizing bactericide are combined to enhance the cleaning effect of the reverse osmosis membrane. For different cleaning purposes, non-oxidizing bactericides suitable for acidic and alkaline cleaning are formulated. Sodium benzoate and benzalkonium chloride show good application prospects in the removal of reverse osmosis membrane fouling.

The utility model discloses a thermal hydrolysis cyanide breaking device, which relates to the technical field of wastewater treatment and comprises a cyanide breaking reactor, a wastewater heat exchanger, a pipeline mixer, a steam mixer, an instrument control valve and the like. After being heated by the wastewater heat exchanger, the wastewater enters a cyanide breaking reactor, and steam enters a steam mixer to heat the wastewater to a specified temperature and then enters the cyanide breaking reactor. The characteristic that the cyanide aqueous solution is easy to hydrolyze is utilized, so that the cyanide aqueous solution is hydrolyzed at the temperature of higher than 140 DEG C to produce sodium formate and ammonia, the toxicity of cyanide is eliminated, high-temperature wastewater discharged from the cyanide breaking reactor enters the wastewater heat exchanger to exchange heat with wastewater to be treated, and heat is recovered; the pressure of the reactor is controlled through a wastewater heat exchanger outlet wastewater outlet pipeline pressure regulating valve. The cyanide wastewater treatment device is reasonable in design, only a small amount of sodium hydroxide is needed for adjusting the pH of wastewater, no chemical agent needs to be added in other procedures, the cyanide wastewater treatment efficiency is improved, and the cost is saved.

The invention provides a pharmaceutical wastewater treatment process. The pharmaceutical wastewater treatment process comprises the following steps: A1, pretreatment, A2, adsorption treatment, A3, oxidation treatment and A4, filtration treatment. In the step A2, a composite adsorbent comprising the following raw materials: attapulgite, activated carbon, carbon nanotubes, 4-carboxyphenylboronic acid, polyethyleneimine, sodium dithiocarbamate, epoxy resin E-44, deionized water and modified nano zero-valent iron is used, and self-repairing is realized through dynamic chemical bonds such as boric acid ester bonds, imine bonds and thiol-disulfide bonds; the adsorbent can be self-repaired during microscopic damage, so that the service life is prolonged, and relatively high adsorption capacity is kept. In the step A3, a gel microsphere oxidant comprising the following raw materials: hydrogen peroxide, potassium persulfate, copper-iron sulfide, nitrogen-doped carbon quantum dots, sodium alginate powder, sodium polyacrylate and a phosphate buffer solution is used, and efficient degradation is realized through a synergistic mechanism of free radical oxidation, non-free radical oxidation and photocatalysis.

Compared with the prior art, the traditional Chinese medicine compound oral liquid is mainly used for invigorating qi and blood, regulating yin and yang, nourishing liver and kidney, strengthening spleen and stomach, strengthening muscles and bones and the like, a plurality of traditional Chinese medicine components are compounded and decocted to obtain liquid medicine, and finally specific modified polysaccharide, steviosin, sodium benzoate and ethylparaben are added, so that the traditional Chinese medicine compound oral liquid is prepared. The modified polysaccharide is screened and optimized and is added into the compound oral liquid, and the problems of serious wall hanging and high liquid medicine waste rate in the prior art are solved by reducing the low-temperature storage wall hanging rate and the hydrolysis rate in storage stability on the premise of not influencing the medicine effect and safety.

The invention relates to the technical field of precious metal recovery, in particular to a process for separating precious metal from copper-nickel smelting waste, which comprises the following steps: crushing and grading the waste, adding a sulfuric acid solution containing etidronic acid, leaching, and washing, drying and crushing filter residues to obtain a pretreated material; mixing the pretreated material with a sodium peroxide-sodium carbonate composite flux, roasting, leaching with water, and filtering to obtain a filter residue B; adding a leaching agent containing hydrochloric acid, sodium chlorate and 1, 2-cyclohexanediamine tetraacetic acid into the filter residue B according to the ratio of 1: 3-1: 5, and filtering to obtain filtrate C and filter residue C; adjusting the pH value of the filtrate C to 1.5-2.5, adding an ethanol solution of sodium N, N-diethyldithiocarbamate, precipitating, washing and calcining to obtain sponge palladium; adding ammonium chloride into the filtrate D, precipitating and calcining to obtain sponge platinum; and leaching the filter residue C by using a hydrochloric acid-chloroauric acid mixed solution containing diphenylthiourea, and replacing and calcining zinc powder to obtain crude gold. According to the process, the leaching rates of platinum, palladium and gold and the product purity are greatly improved; flux and reagent systems are optimized, consumption and energy consumption are reduced, waste liquid treatment is matched for up-to-standard discharge, and efficient resource recovery and environment-friendly cooperation are achieved.

The invention discloses a sugar-free electrolyte beverage and a preparation method thereof, and relates to the technical field of functional beverages. The sugar-free electrolyte beverage comprises the following components in parts by weight: 80-90 parts of erythritol, 0.5-2 parts of an electrolyte component, 0.4-0.8 part of a buffer agent, 0.1-0.2 part of vitamin B6, 0.1-0.5 part of taurine, 1-3 parts of an auxiliary agent and 1000-1200 parts of water, the electrolyte component comprises at least four of edible salt, potassium chloride, magnesium sulfate, calcium lactate and calcium citrate, the buffer agent comprises potassium dihydrogen phosphate and sodium citrate, and the auxiliary agent comprises sodium dihydrogen phosphate and sodium citrate. The auxiliaries comprise citric acid, sodium benzoate and essence. The sugar-free electrolyte beverage disclosed by the invention is high in blood osmotic pressure recovery speed, does not cause blood sugar fluctuation when supplementing electrolyte for a human body, and tastes fresh and cool.

The synthesis method comprises the following steps: S1, adding furandicarboxylic acid into a reaction container, adding a certain amount of methanol, adding a double-acid-site strong acid solid catalyst, starting stirring, controlling the reaction temperature to carry out esterification reaction, and after the reaction is finished, filtering, washing and drying to obtain furandihydrazide; separating out the double-acid-site strong acid solid catalyst to obtain clear liquid, namely dimethyl furandicarboxylate; s2, transferring dimethyl furandicarboxylate serving as a raw material into another reaction container, adding a certain amount of sodium formate serving as a catalyst, then adding a proper amount of hydrazine hydrate, controlling the reaction temperature, keeping a reflux state, reacting for a period of time, cooling to room temperature after the reaction is finished, and performing centrifugal separation to obtain white solid furandihydrazide. The synthesis method has the advantages of simple reaction steps, no need of toxic and harmful catalysts, mild reaction conditions, high conversion rate and high yield, and can realize efficient, green and low-cost production of furandihydrazide.

The invention relates to a composite phase change cold storage material and a preparation method thereof. According to the technical scheme, 60-90 wt% of deionized water, 4-34 wt% of anhydrous sodium formate, 2-5 wt% of anhydrous potassium sulfate and 1-4 wt% of xanthan gum are evenly mixed and dispersed, and a phase change cold storage medium is prepared; the preparation method comprises the following steps: mixing 64-75wt% of absolute ethyl alcohol, 15-20wt% of deionized water, 9-12wt% of nitric acid solution and 1-4wt% of expanded graphite, and standing to obtain dispersion liquid I; uniformly mixing 60 to 70 weight percent of tetrabutyl titanate and 30 to 40 weight percent of absolute ethyl alcohol, so as to obtain dispersion liquid II; uniformly mixing 30-40wt% of the dispersion liquid II and 60-70wt% of the dispersion liquid I under the condition of 70-100 DEG C, filtering and drying to prepare the nano titanium dioxide coated expanded graphite; 30-40 wt% of expanded graphite wrapped by nanometer titanium dioxide and 60-70 wt% of a phase change cold storage medium are subjected to vacuum impregnation and compression molding, and the composite phase change cold storage material is prepared. The prepared product is high in heat conductivity, large in phase change latent heat value, small in supercooling degree and good in cycling stability.

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.

The invention discloses a coal gangue-based ceramic tile adhesive for thin-layer paving and a preparation method of the coal gangue-based ceramic tile adhesive, and belongs to the technical field of adhesives. Comprising the following raw materials: 450-550 parts of composite coal gangue powder, 250-300 parts of ordinary Portland cement, 15-20 parts of copolymer rubber powder, 1-2 parts of hydroxypropyl methyl cellulose, 0.2-0.5 part of starch ether, 5-8 parts of sodium formate, 8-10 parts of reinforced fibers, 10-15 parts of an early strength agent and 180-200 parts of water. Coal gangue powder is subjected to decarburization treatment, reaction activity is improved, the coal gangue powder is adsorbed in filling pores of phase change microcapsules to reduce the water absorption rate and enhance the mechanical property and durability, then a silane coupling agent KH570 solution is used for modification, the water resistance is optimized, and tetrapod-like zinc oxide enhanced fibers, cement, rubber powder and the like are matched to achieve the synergistic effect, so that the waterproof performance is improved. The coal gangue-based ceramic tile adhesive for thin-layer paving is obtained, and the environmental protection and performance requirements are both considered.

The invention discloses a chlorine-free long-acting low-corrosion coal anti-freezing solution for railway transportation, which is mainly used for freezing prevention in the railway transportation process of coal, and belongs to the technical field of coal anti-freezing solutions. The coal anti-freezing solution is prepared from the following raw materials and components in percentage by mass: 20 to 27 percent of ethylene glycol, 17 to 24 percent of sodium formate, 4 to 5 percent of urea, 0.09 to 0.7 percent of thickening agent and the balance of water. Compared with a traditional anti-freezing solution, the coal anti-freezing solution prepared by the invention has the following advantages that the raw materials are cheap and easily available, and the preparation can be completed in a normal-temperature state; the corrosion to metal is small, and high-toxicity and environment-harmful substances are not contained; the anti-freezing agent is stable in property, moderate in viscosity and lasting in anti-freezing effect, and does not need to be supplemented during transportation and storage; the freezing point can reach-43 to-55 DEG C, and the problems of freezing in the coal transportation process in winter and corrosion of a traditional anti-freezing solution to the railway carriage wall can be effectively solved after the anti-freezing solution is sprayed on the surfaces of the coal and the carriage wall according to specific conditions.

The invention relates to the technical field of sodium ion batteries, and discloses a preparation method of a sodium battery additive and application of the sodium battery additive in a sodium battery, and the preparation method comprises the following steps: a) a reaction step: in an isopropanol solvent, enabling pyromellitic acid and sodium hydroxide to react under heating and stirring; after the reaction is finished, filtering a reaction product to obtain a benzene tetracarboxylic acid sodium crude product; b) a purification step: dissolving the benzene tetracarboxylic acid sodium crude product in water, and heating for rotary evaporation until the solution reaches a saturated state; adding methanol into the solution in the saturated state to separate out a solid, and filtering a mixture containing the solid while the mixture is hot; and carrying out vacuum drying on the solid obtained by filtering to obtain the sodium electric additive. According to the invention, the high-purity product is used as the sodium-ion battery additive, and the comprehensive performances of high-temperature circulation, high magnification, low temperature and the like of the battery can be comprehensively and obviously improved through a unique mechanism of synchronously forming a stable protective film on a positive electrode and a negative electrode.

The invention relates to a water treatment agent for advanced treatment of thallium-containing wastewater in nonferrous metallurgy. The water treatment agent is prepared by fully mixing and uniformly stirring the following raw materials in parts by weight: 50-80 parts of a sodium diethyldithiocarbamate aqueous solution with the mass concentration of 5%-15%, 10-40 parts of sulfide or polysulfide and 10-40 parts of sodium thiosulfate. The water treatment agent provided by the invention can realize efficient removal of heavy metal ions, does not need a subsequent treatment process, not only simplifies the treatment process, but also reduces the treatment cost.

An integrated energy system comprising a power plant configured to generate steam. The power plant can include a nuclear reactor and / or an electrical power generation system. A chemical products generation system can include a first reaction chamber receiving Sodium Formate (HCOONa) that, via insertion of a first portion of the steam at a first temperature, is decomposed into Sodium Oxalate ((COO)2Na2) and Hydrogen (H2), the steam including super-heated steam. The chemical products generation system can include a second reaction chamber receiving the Sodium Oxalate ((COO)2Na2) that, via insertion of a second portion of the steam at a second temperature, is decomposed into Sodium Oxide (Na2O), Carbon Monoxide (CO), and Carbon Dioxide (CO2). A syngas generation system can be operably coupled to the chemical products generation system and configured to generate a combination of the Hydrogen (H2), the Carbon Monoxide (CO), and / or the Carbon Dioxide (CO2), and / or to generate syngas.

The invention relates to a coal chemical industry wastewater anaerobic detoxification method, and belongs to the technical field of coal chemical industry wastewater anaerobic detoxification. The method comprises the following steps: pre-treating and regulating the oxidation-reduction potential of the wastewater to-80mV to-50mV; inoculating the polyurethane foam carrier with a mixed flora of thiocyanogen degrading bacteria and phenol hydrolytic bacteria to form a layered biological membrane; the oxidation-reduction potential is controlled in stages, and sodium formate is added under the micro-aerobic condition to preferentially degrade thiocyanate radicals to generate bicarbonate radicals; nano zero-valent iron is added to reduce catechol and adsorb cyanide; and adding ethanol and humic acid under a strict anaerobic condition to degrade phenols. Through flora metabolism path decoupling, metabolite synergy and nanometer material directional detoxification, the problems of equipment redundancy, flora competitive inhibition and intermediate product toxicity accumulation of a traditional multi-stage reactor are solved, efficient step-by-step degradation of thiocyanide and phenols is achieved in a single reactor, the biodegradability of wastewater is remarkably improved, and the method is suitable for industrial production. And a low-toxicity environment is provided for subsequent treatment.

The invention provides polyacrylamide gel, a preparation method and application of the polyacrylamide gel in a water-based self-suspension fracturing propping agent, and relates to the technical field of oil exploitation. The polyacrylamide gel disclosed by the invention is prepared from the following components in parts by weight: 40 to 50 parts of acrylamide, 20 to 30 parts of acrylic acid, 15 to 25 parts of 4-methacrylamide salicylic acid, 1.5 to 2 parts of diacraldehyde pentaerythritol, 0 to 4 parts of sodium carboxymethyl cellulose, 1 to 5 parts of carbamide, 5 to 15 parts of sodium hydroxide, 0.02 to 0.08 part of EDTA-2Na (Ethylene Diamine Tetraacetic Acid), 5 to 15 parts of cross-linking agent, 1 to 10 parts of initiator, 0.01 to 0.1 part of sodium formate and 40 to 65 parts of water. The polyacrylamide gel is prepared through a copolymerization method, the method is simple, and the obtained polyacrylamide gel is high in dissolution speed, good in drag reduction performance and excellent in salt resistance.

An integrated energy system including a power plant is discussed herein. In some examples, the integrated energy system may include at least one nuclear reactor and electrical power generation system configured to generate steam and electricity, a water treatment plant configured to produce Sodium Hydroxide (NaOH) from salt water, a Sodium Formate (HCOONa) production plant configured to receive the Sodium Hydroxide (NaOH) to produce Sodium Formate (HCOONa), a Thermal Decomposition reactor configured to receive the Sodium Formate (HCOONa) and configured to receive at least a first portion of the steam or at least a second portion of the electricity from the power plant to indirectly heat the Thermal Decomposition reactor to produce Hydrogen (H2), Carbon Dioxide (CO2), and Carbon Monoxide (CO) from the Sodium Formate (HCOONa), and a Methanol (CH3OH) reaction chamber configured to receive the Hydrogen (H2), the Carbon Dioxide (CO2), and the Carbon Monoxide (CO) to produce Methanol (CH3OH).

The invention discloses a flue gas desulfurization composite synergist and a preparation method thereof, and relates to the technical field of flue gas desulfurization. The desulfurization composite synergist is prepared from the following raw materials in parts by weight: 5 to 10 parts of citric acid, 20 to 30 parts of binary acid, 15 to 20 parts of sodium formate, 15 to 20 parts of sodium salt, 12 to 18 parts of magnesium salt, 2 to 4 parts of surfactant, 2 to 4 parts of pH buffering agent and 5 to 10 parts of calcium oxide. The preparation method comprises the following steps: carrying out a ring-opening reaction on 3-(2-aminoethylamine) propyl methyl dimethoxy silane and glucolactone to obtain an intermediate 1, and then carrying out a two-step quaternization reaction to synthesize the novel surfactant. The prepared desulfurization composite synergist has a good desulfurization effect and is suitable for limestone-gypsum wet flue gas desulfurization.

The invention discloses an AES concentrated formula with high-activity components and a preparation method of the AES concentrated formula. The invention discloses an AES (acrylonitrile-ethylene-propylene-diene monomer styrene) water-based detergent which comprises the following components in percentage by weight: 25%-35% of AES, 8%-12% of sodium n-alkyl benzene sulfonate, 5%-8% of alkyl glycoside, 4%-6% of cocamidopropyl betaine, 18%-28% of a composite chelating agent, 2%-4% of sodium chloride, 0.3%-0.5% of EDTA (Ethylene Diamine Tetraacetic Acid)-disodium, 0.5%-1% of sodium benzoate, 3%-5% of propylene glycol and the balance of deionized water. AES is used as a main surfactant, and forms a ternary compound system with sodium n-alkyl benzene sulfonate, alkyl glycoside and cocamidopropyl betaine. Through the synergistic effect of the surfactants of different ion types, the critical micelle concentration (CMC) and the micelle aggregation number are remarkably improved, so that the active ingredients can form a stable micelle structure at a lower concentration, and the dirt-removing power and the foaming performance are improved. Sodium tripolyphosphate, sodium pyrophosphate and sodium citrate form a composite chelating agent, the chelating capacity of the composite chelating agent on Ca < 2 + >, Mg < 2 + > and other metal ions is larger than or equal to 300 mgCaCO3 / g, the inhibition effect of hard water on a surfactant can be effectively eliminated, and the stability of the formula under different water quality conditions is enhanced.

The invention belongs to the technical field of chemical production, and particularly relates to a novel process for separating pentaerythritol by a membrane method and application of the novel process. The membrane separation comprises the steps of separating sodium formate by using an ion exchange membrane and separating pentaerythritol by using a low-pressure nanofiltration membrane device. The dealdehyding liquid is separated through different membranes, and formic acid, pentaerythritol, dipentaerythritol and other substances can be effectively separated. The process greatly shortens the process flow and saves the cost. According to the technical scheme, the quality and performance of the pentaerythritol product are remarkably improved, the added value of the product is increased, and a new technical scheme is provided for industrial production of pentaerythritol.

The method comprises the following steps: S1, adding a formic acid-sodium formate solution into raw material powder, carrying out high-temperature oil bath, cooling to room temperature, carrying out suction filtration to obtain a supernatant A containing xylooligosaccharide, repeatedly cleaning and carrying out suction filtration until the extracted liquid is neutral, and drying at low temperature to obtain the xylooligosaccharide powder; pre-treated lignin raw materials are obtained; s2, putting the supernate into a dialysis bag, and magnetically stirring to obtain primary dialysis liquid B; s3, putting the preliminary dialysis liquid B into a dialysis bag, and magnetically stirring to obtain dialysis liquid C; s4, concentrating the dialysis liquid C to obtain concentrated liquid D; and S5, pre-freezing the concentrated liquid D, and freeze-drying the sample to obtain xylooligosaccharide powder E. According to the method, formic acid-sodium formate is used as a catalytic medium, different acid concentrations and molar ratios are adopted, high-temperature oil bath and dialysis freeze-drying are utilized for two-step extraction, and the yield of xylooligosaccharide after catalysis is obviously increased.

The object of the present invention to solve a problem that when products such as films, molded products, or fibers are continuously produced from a copolymerized polyester resin copolymerized with diethylene glycol and sodium sulfoisophthalate, die contamination and adhesion of foreign matter to the products occur and a problem that during recycling of a copolymerized polyester resin copolymerized with diethylene glycol and sodium sulfoisophthalate, the resin is colored or the molecular weight of the resin is reduced. A copolymerized polyester resin containing terephthalic acid as a main dicarboxylic acid component and ethylene glycol as a main diol component, wherein when a total amount of dicarboxylic acid components in all polyester resin components is taken as 100 mol %, a ratio of the terephthalic acid component to all the dicarboxylic acid components is 70 to 99.95 mol % and a ratio of sodium sulfoisophthalate to all the dicarboxylic acid components is 0.05 to 10 mol %, when a total amount of diol components is taken as 100 mol %, a ratio of diethylene glycol to all glycol components is 1 to 10 mol %, a content of a free cyclic monomer consisting of terephthalic acid, sodium sulfoisophthalate, ethylene glycol, and diethylene glycol is 20 ppm or less, and a content of a free cyclic trimer consisting of terephthalic acid, sodium sulfoisophthalate, and ethylene glycol is 200 ppm or less.

The invention belongs to the technical field of cough relieving and phlegm eliminating medicines, and particularly relates to compound dextromethorphan hydrobromide syrup and a preparation method thereof. On the basis that the total volume of the compound dextromethorphan hydrobromide syrup is 1000L, the compound dextromethorphan hydrobromide syrup provided by the invention is prepared from the following components: 3000g of dextromethorphan hydrobromide, 20kg of guaiacol glyceryl ether, 650kg of cane sugar, 100L of 1, 2-propylene glycol, 2000g of benzoic acid, 200g of sodium benzoate, 100g of menthol, 4000mL of essence, 14000mL of ethanol, 2000mL of caramel pigment and the balance of purified water. The compound dextromethorphan hydrobromide syrup provided by the invention takes benzoic acid as a main preservative and is matched with sodium benzoate; meanwhile, the dosage ratio of all the components in the syrup is optimized, the obtained compound dextromethorphan hydrobromide syrup is good in preservative effect, and adverse reactions are reduced.

The present invention discloses a method for synthesizing hydroxytyrosol by multi-enzyme cascade, comprising: 1) preparing a hydroxytyrosol product by using 3,4-dihydroxybenzaldehyde, L-threonine, sodium formate, NAD + As raw material, L-threonine transaldolase, alcohol dehydrogenase, and formate dehydrogenase are used to catalyze the synthesis of L-threo-3-(3,4-dihydroxyphenyl)serine; 2) L-threo-3-(3,4-dihydroxyphenyl)serine is used as substrate, glucose, NAD + Hydroxytyrosol is synthesized through a cascade catalysis of phenylserine dehydratase, α-ketoacid decarboxylase, aldehyde reductase, and glucose dehydrogenase. The synthesis method provided by the present invention achieves a hydroxytyrosol yield of >99% and a space-time yield of 0.88 g / L / h, currently the highest, showing great potential for industrial application and suitable for further promotion and application.

The application relates to the technical field of fine chemical industry, in particular to a circulating reaction device and a method for preparing sodium 3,3',4,4'-biphenyltetracarboxylate by using the same. The circulating reaction device comprises: a batching kettle, a discharging pipeline and a circulating pipeline are arranged on the batching kettle; a reaction unit, an inlet pipeline and an outlet pipeline are arranged on the reaction unit; the inlet pipeline is communicated with the discharging pipeline; the outlet pipeline is communicated with the circulating pipeline; a filler area is arranged in the reaction unit; the fillers of the filler area at least comprise a catalyst; a pump is arranged on the inlet pipeline; a qualified reaction liquid kettle, a qualified liquid inlet pipeline is arranged on the qualified reaction liquid kettle, and the qualified liquid inlet pipeline is communicated with the outlet pipeline; a washing liquid kettle, a washing liquid first pipeline and a washing liquid second pipeline are arranged on the washing liquid kettle, the washing liquid first pipeline is communicated with the outlet pipeline, the inlet pipeline is communicated with the washing liquid second pipeline, and the washing liquid kettle is used for containing washing liquid for washing the catalyst. The application can effectively improve the reaction conversion rate, realize automatic production and improve the production efficiency.

The present invention relates to a method for anaerobic detoxification of coal chemical wastewater, and belongs to the technical field of anaerobic detoxification of coal chemical wastewater. The method comprises pre-treatment to regulate the redox potential of the wastewater to a range of 80mV to 50mV; inoculating a mixed bacterial community of thiocyanate-degrading bacteria and phenol-hydrolyzing bacteria on a polyurethane foam carrier to form a layered biofilm; controlling the redox potential in stages, adding sodium formate under microaerobic conditions to preferentially degrade thiocyanate to produce bicarbonate; adding nano-zero-valent iron to reduce catechol and adsorb cyanide; and adding ethanol and humic acid under strictly anaerobic conditions to degrade phenols. Through the decoupling of bacterial metabolic pathways, the synergistic detoxification of metabolites and the targeted detoxification of nanomaterials, the problems of redundancy of traditional multi-stage reactor equipment, bacterial competitive inhibition and toxic accumulation of intermediate products are solved, and efficient step-by-step degradation of thiocyanate and phenols is achieved in a single reactor, the biodegradability of the wastewater is significantly improved, and a low-toxic environment is provided for subsequent treatment.