411 results about "Acid hydrolysis" patented technology

The invention provides a method for preparing squaric acid and a method for preparing a lithium supplement agent of lithium squarate. The method for preparing squaric acid comprises the steps of preparing an intermediate I, preparing an intermediate II and preparing squaric acid. The method for preparing the squaric acid is a novel squaric acid synthesis route, and the squaric acid is obtained through cycloaddition / substitution reaction of perchloroprene serving as an initial raw material and morpholine, hydrolysis / rearrangement reaction in a buffer system and acid hydrolysis reaction in sequence. The method for preparing squaric acid has the advantages of simple reaction steps, mild reaction conditions, high yield, low cost and the like. The invention also provides a method for preparing the lithium squarate lithium supplement agent, and the prepared squaric acid and lithium-containing alkali are blended in a solvent for reaction to generate the lithium squarate. The method for preparing the lithium squarate lithium supplement has the advantages of simple reaction steps, mild reaction conditions, high yield, low cost and the like.

The present invention provides a method for detecting the content of effective components in a polyamide epichlorohydrin wet strength agent, and belongs to the technical field of analysis and detection. The detection method comprises the following steps: (1) preparing a PAE test solution; (2) obtaining a reaction solution 1 through an acid hydrolysis reaction; (3) obtaining a reaction solution 2 through an esterification reaction; (4) using a gas chromatograph-mass spectrometer to test the response value of diethyl adipate in the sample to be tested; (5) drawing a standard curve to calculate the concentration of diethyl adipate in the sample to be tested; (6) excluding the concentrations of diethyl adipate and adipic acid in the test sample; (7) calculating the content of effective components in the polyamide epichlorohydrin wet strength agent sample to be tested by a formula. The method is used for detecting the content of effective components in a polyamide epichlorohydrin wet strength agent, can accurately calculate the content of PAE effective components in the wet strength agent, significantly improves the accuracy and reliability of the determination, reduces the detection cost and operation difficulty, and has wide applicability.

The invention provides a Chinese date modified acidic polysaccharide. Each 100 mg of the Chinese date modified acidic polysaccharide contains 90.26 mg + / -1.39 mg to 94.42 mg + / -1.83 mg of total polysaccharide, the total uronic acid content is 21.42 mg + / -1.01 mg to 50.72 mg + / -0.62 mg; total bound phenol: 0.65 mg of GAE + / -0.05 mg of GAE-1.21 mg of GAE + / -0.03 mg of GAE (equivalent weight of gallic acid). The invention also provides a preparation method and application of the jujube modified acidic polysaccharide. The jujube acidic polysaccharide is modified through a low-temperature alkaline deesterification technology, a directional enzyme digestion technology and a controllable partial acid hydrolysis technology, the in-vivo and in-vitro immunomodulatory activity of the jujube acidic polysaccharide before and after modification is compared, and the immunomodulatory activity of the jujube modified acidic polysaccharide obtained through modification is remarkably enhanced; especially, the jujube modified acidic polysaccharide with araban side chains removed and galactan side chains reduced has better immunocompetence.

The invention discloses a 2, 4, 5-trifluorophenylacetic acid hydrolysis wastewater reuse device and process, and relates to the technical field of wastewater reuse, the 2, 4, 5-trifluorophenylacetic acid hydrolysis wastewater reuse device comprises a sewage treatment tank, the top of the sewage treatment tank is fixedly provided with a water inlet pipe, the bottom of the sewage treatment tank is fixedly provided with a water outlet pipe, and the inner wall of the sewage treatment tank is slidably provided with a filter plate; a feeding box is fixedly mounted at the top of the sewage treatment tank, and a discharging pipe is arranged at the bottom of the feeding box; the wastewater treatment device is arranged in the sewage treatment tank, the wastewater treatment device comprises a motor, a reciprocating screw rod, stirring blades, a moving frame, an L-shaped rod, a supporting plate, an elastic telescopic rod, an arc-shaped plate, a guide plate, a short rod, a rotating plate and a limiting plate, the motor rotates to drive the reciprocating screw rod to rotate, the reciprocating screw rod rotates to drive the stirring blades to rotate, and the stirring blades can rotate to drive the moving frame to move; the waste residue is prevented from adhering to the inner wall of the sewage treatment tank to reduce the reaction efficiency and affect the wastewater treatment and recovery efficiency.

The invention discloses a composition for assisting in reducing blood sugar and blood fat as well as a preparation method and application thereof, and relates to the technical field of functional compositions. The composition comprises highland barley powder and modified inulin, the preparation method of the highland barley powder comprises the following steps: soaking highland barley grains in a weakly alkaline aqueous solution, and sequentially carrying out first pulse microwave treatment, enzyme deactivation treatment and segmented baking treatment; the segmented baking treatment comprises first-stage baking treatment and second-stage intermittent infrared irradiation treatment; the temperature of the first-stage baking treatment is 40-60 DEG C; the temperature of the second-stage intermittent infrared irradiation treatment is 60-80 DEG C, and the emission wavelength is 2.5-4 microns; the preparation method of the modified inulin comprises the following steps: performing acidolysis treatment on inulin in a weakly acidic aqueous solution, and then drying. The highland barley powder and the modified inulin in the embodiment can synergistically improve glycometabolism and lipid metabolism, effectively reduce the body weight, blood sugar, blood fat and the like under high-glucose and / or high-fat diet, and protect and repair the pancreas islet function.

The invention discloses a construction method and application of a fucoidin fingerprint spectrum, monosaccharide composition of fucoidin is used as fingerprint spectrum research of index components, and ion chromatography fingerprint spectrums of different batches of fucoidin are constructed by optimizing an acid hydrolysis method and ion chromatography conditions. A theoretical basis can be provided for the quality control of the fucoidin. Meanwhile, the ion chromatograms of different algal polysaccharides are analyzed to find that different algal polysaccharides have differences, and reference is provided for quality control of fucoidin and algal polysaccharides from different sources.

The invention relates to the technical field of preparation of composite carbon sources, and discloses a method for preparing a micromolecular composite carbon source by using soapstock acidified leftovers, which comprises the following steps: pretreatment: centrifugally separating the soapstock acidified leftovers, recovering crude fatty acid, and regulating the pH value of the water phase to 5.0-6.0 by using an alkaline regulator, performing enzymolysis, namely adding compound protease into the pretreated water phase, performing enzymolysis reaction at 45-55 DEG C, performing organic acid hydrolysis, namely adding small molecular organic acid into a system subjected to enzymolysis, adjusting the pH value of the system to 2.0-4.0, performing hydrolysis reaction at 85-100 DEG C, performing neutralization and post-treatment, cooling the system after the hydrolysis is completed, neutralizing the pH value of the system to 5.5-6.5 by adopting an alkaline substance, and performing post-treatment to obtain a finished product. And filtering to obtain the small molecular carbon source. The alkaline substance is potassium hydroxide, ammonia water or urea. According to the method for preparing the micromolecular composite carbon source by utilizing the soapstock acidified leftovers, the waste liquid, which is the soapstock acidified leftovers generated in the grease refining process and is difficult to biochemically treat, can be converted into the micromolecular composite carbon source with high market value.

The invention provides a preparation method of a chlorantraniliprole key intermediate 2-amino-5-cyano-N, 3-dimethyl benzamide, which comprises the following steps: taking cheap and easily available o-methylaniline as a raw material, acylating an aniline substrate through Boc anhydride, carrying out ortho-lithiation on n-butyllithium, introducing carbon dioxide gas, and carrying out acid hydrolysis to obtain 2-amino-3-methyl benzoic acid, thereby obtaining the chlorantraniliprole key intermediate 2-amino-5-cyano-N, 3-dimethyl benzamide. The preparation method comprises the following steps: firstly, preparing an isatoic anhydride intermediate, then carrying out triphosgene ring closing to obtain an isatoic anhydride intermediate, carrying out bromine para-position halogenation, carrying out cuprous cyanide high-temperature Rosenmn-von Braun reaction, and finally carrying out methylamine ring opening to obtain the target product 2-amino-5-cyano-N, 3-dimethylbenzamide, and although the route is long, the yield is high, the continuity is good, few industrial three wastes are generated, and the cost is lower, so that the preparation method has great industrial production value.

The invention discloses a method for detecting anti-aging new food raw materials in foods, the foods comprise milk and dairy products, beverages, wines, cocoa products, chocolates and chocolate products (including cocoa butter substitute chocolates and chocolate products), candies, frozen drinks and the like, and the anti-aging new food raw materials are sodium hyaluronate. The method comprises the following steps: (1) preparing a standard stock solution and a standard working solution; (2) preparing a to-be-detected sample solution; (3) setting high performance liquid chromatography analysis conditions; (4) establishing a standard working curve; and (5) analyzing a result. The invention establishes a high performance liquid chromatography determination method for anti-aging new food raw materials in food. According to the method, the anti-aging new food raw material sodium hyaluronate in the food is determined by innovatively adopting a high-pressure acid hydrolysis-precolumn derivatization method, so that the detection sensitivity is improved, the detection cost is reduced, the operation is simple and easy to implement, and a brand new technical thought is provided for analysis and detection of sodium hyaluronate in the food. The method is simple to operate, high in sensitivity, good in reproducibility and stability, low in cost and beneficial to batch detection of related products.

The invention discloses a preparation method of gardenia blue pigment. The preparation method comprises the following steps: (1) precipitating and removing impurities by copper sulfate: precipitating and removing impurities from column liquid after gardenia yellow is extracted by copper sulfate to obtain supernate; (2) oxidizing and decoloring by potassium permanganate and removing excessive copper ions: performing neutral oxidation on the supernate by potassium permanganate to obtain decolored supernate; (3) nanofiltration concentration and spray drying: carrying out alkaline nanofiltration concentration and spray drying on the decolorized supernatant to obtain a geniposide solid crude product; (4) extracting geniposide with propyl alcohol and recrystallizing: extracting the crude product with ethyl acetate and recrystallizing to obtain a fine geniposide product; (5) ethyl acetate two-phase acid hydrolysis: carrying out ethyl acetate two-phase acid hydrolysis and recrystallization on the refined product to obtain a genipin pure product; and (6) preparing a gardenia blue pigment pure product: reacting the genipin pure product with sodium isoleucine to obtain the gardenia blue pigment. The method is simple and easy to implement, convenient to operate, outstanding in product characteristics, easy in equipment type selection and matching, low in equipment investment, high in product additional value, good in economic benefit and capable of being mechanized.

The invention relates to polysaccharide acrylic resin and a preparation method thereof, and belongs to the technical field of intersection of high value-added utilization of biomass resources and acrylic resin. The polysaccharide acrylic resin is prepared from the following components in parts by weight: 40 to 50 parts of acrylic modified polysaccharide, 10 to 30 parts of acrylic monomer, 20 to 30 parts of polybasic acid, 10 to 15 parts of polyhydric alcohol, 3 to 5 parts of emulsifier, 0.4 to 0.6 part of initiator, 0.1 to 0.3 part of defoaming agent, 1 to 3 parts of catalyst and 60 to 80 parts of deionized water. Coffee grounds are subjected to impurity removal, lignin removal, acid hydrolysis and acrylic acid group modification, so that the coffee grounds are converted into delignification coffee grounds with high cellulose and hemicellulose content, then the delignification coffee grounds are hydrolyzed into polysaccharide with high chemical reaction activity, finally acrylic acid group modified polysaccharide is formed, acrylic acid groups are grafted on molecular chains, and the modified polysaccharide is obtained. Polysaccharide molecules have a large amount of hydroxyl groups which further react with polybasic acid to form a net-shaped cross-linked molecular chain, so that the acrylic resin after film formation has higher strength performance.

The invention discloses an analysis method for determining the content of galactosamine in sulfated polysaccharide based on high-temperature hydrochloric acid hydrolysis and an ion chromatograph method, which comprises the following steps: hydrolyzing a test sample with hydrochloric acid at high temperature to release galactosamine, separating with an ion chromatograph and a sugar analysis column, detecting with a pulsed ampere detector, and determining the content of galactosamine in sulfated polysaccharide according to a galactosamine reference substance. And quantitatively analyzing the content of galactosamine in the test sample. The method disclosed by the invention has the advantages of simplicity, rapidness, accuracy, high efficiency, no need of derivation treatment and the like.

The invention discloses a method for preparing an olefin-substituted aromatic boronic acid, and belongs to the technical field of pharmaceutical intermediates. Chloroacetophenone is used as a raw material, and chloro-1-phenylethanol is obtained by reduction with a reducing agent, and then a chlorostyrene solution is obtained by dehydration with an acid catalyst in a high boiling point solvent, and finally a chlorostyrene solution is reacted with a strong base reagent and a borate ester in a continuous flow, and acid hydrolysis is performed to obtain vinylbenzene boronic acid. The present invention adopts a high-temperature negative pressure dehydration method to prepare a key intermediate of chlorostyrene, with high conversion rate, few polymerization by-products, and rapid reaction; the boration reaction of chlorostyrene adopts a continuous flow method to improve reaction specificity, reduce reaction safety, and can efficiently and safely prepare high-quality vinylbenzene boronic acid.

The invention relates to the technical field of waste mushroom bran hydrothermal resource conversion, and particularly discloses a method for preparing humic acid by a two-step hydrothermal method and application thereof. The method comprises the following steps: S1, crushing and sieving collected waste mushroom residues after drying; s2, dispersing the mushroom residue powder in a hydrochloric acid solution according to a preset solid-to-liquid ratio, and then carrying out a first hydrothermal reaction on the mixed solution; after the reaction is finished, cooling the system to room temperature, and filtering to retain an upper reaction clear liquid; s3, adjusting the pH value of the upper reaction clear liquid with a sodium hydroxide solution, and carrying out a second hydrothermal reaction; s4, reactants are taken out, humic acid liquid and hydrothermal carbon are separated through first centrifugation, supernate is subjected to second centrifugation, obtained solids are freeze-dried, and the humic acid is obtained. The acid hydrolysis pretreatment is carried out, so that the content of alkali heat humification monomers is increased; the generation of high-yield humic acid is facilitated. The humic acid can significantly promote seed germination and can be completely used as a humic acid fertilizer for plant growth and development.

The invention discloses a preparation method of a famotidine injection. The preparation method of the famotidine injection provided by the invention comprises the following steps: injecting water for injection into a liquid preparation tank, and then sequentially adding nicotinamide, lactic acid hydrolysate, famotidine, mannitol and vitamin C according to a prescription dosage to obtain a feed liquid; adjusting the pH value of the feed liquid to 5.8-6.2, and fixing the volume; sterilizing, filtering and encapsulating the feed liquid; the preparation method is carried out under full-scale nitrogen charging protection, and in the liquid preparation process, the headspace residual oxygen content is controlled to be smaller than or equal to 0.5%, the liquid preparation temperature is controlled to be smaller than or equal to 25 DEG C, the dissolved oxygen content of liquid medicine is controlled to be smaller than or equal to 0.6 mg / L, and the headspace residual oxygen content of a finished product is controlled to be smaller than or equal to 1.2%. Under the condition of adopting the same raw and auxiliary materials and proportion as the original research medicine preparation, by strictly controlling the operation conditions in the large-scale preparation process, the content of related substances in the injection can be remarkably reduced, the impurity level can be reduced, and meanwhile, the long-term stability of the injection can be remarkably improved.

The present invention provides a number of process improvements related to the conjugation of capsular polysaccharides from Streptococcus pneumoniae to carrier proteins. These methods are serotype specific and include acid hydrolysis, the addition of sodium chloride to the reductive amination reaction, and the addition of sucrose to solubilize the polysaccharide. The polysaccharide-protein conjugates prepared using the methods of the present invention can be included in a multivalent pneumococcal conjugate vaccine.

The invention discloses a method for preparing an amino acid liquid fertilizer by acidolysis of a fox racoon dog carcass and the amino acid liquid fertilizer, and relates to the technical field of amino acid liquid fertilizers. The method comprises the following steps: adding carcass powder or carcass powder of the fox raccoon dog into a sulfuric acid solution with the concentration of 5-7 mol.L <-1 >, and carrying out high-temperature digestion at 110-130 DEG C until thick liquid appears, so as to obtain a digestion solution; in the high-temperature digestion period, a preset amount of 30% hydrogen peroxide is added every 1.0-2.0 h; the mass volume ratio of the fox racoon dog carcass powder to the sulfuric acid solution is (2.5-3.5): 1, the mass volume ratio of the fox racoon dog carcass powder to the sulfuric acid solution is (2.0-2.5): 1, and the volume ratio of the hydrogen peroxide added each time to the sulfuric acid solution is 1: 15; carrying out centrifugal separation on the digestion solution to obtain amino acid liquid; adding a proper amount of ammonia water and magnesium hydroxide into the amino acid liquid to obtain the amino acid liquid fertilizer.

The application discloses an amino acid hydrolysate acid removal process using indirect MVR evaporation, and particularly relates to the technical field of amino acid hydrolysate acid removal processes, and comprises the following steps: S1, amino acid hydrolysate conveying, S2, hydrolysate evaporation under reduced pressure, S3, acid substance gas-liquid separation, S4, secondary steam conveying, and S5, liquid storage. The acid substance in the amino acid hydrolysate is evaporated and acid removal treated by adopting the MVR evaporation technology, so that the hydrolysate can form concentrated liquid and acid substance after being separated under reduced pressure, the generated acid substance is separated by a gas-liquid separator, and acid liquid and secondary steam are generated, the secondary steam can provide a secondary steam source for an evaporator after being compressed by a compressor, thereby providing a large amount of steam source for the evaporator, reducing the emission of acid gas, improving the resource utilization rate, achieving the protection of the environment, and avoiding the harm of acid gas to the human body.

The utility model discloses a hot galvanizing assistant tank which comprises an assistant tank body, a drain valve is arranged at the bottom of the assistant tank body, fixing plates are arranged on two sides of the upper end of the assistant tank body, a support is fixedly connected to the fixing plates, a filter screen frame is arranged below the support, an electric heating pipe is arranged at the bottom end in the assistant tank body, and the electric heating pipe is connected with the electric heating pipe. A stirring device is arranged in the plating assisting tank and located above the electric heating pipe, and a lifting turnover device is arranged in the support and connected with the filter screen frame. The utility model belongs to the technical field of plating assisting tanks, and particularly relates to a plating assisting tank for hot galvanizing, which solves the problem that impurities easily fall to the bottom of the plating assisting tank and are inconvenient to clean when a workpiece is subjected to acidolysis cleaning in the prior art.

A method for treating grain having starch and non-starch carbohydrates, wherein the starch is present in an amount of at least 10% by weight based on the dry weight of the grain. Contacting the grains with a solution containing at least one alpha-hydroxysulfonic acid; and reacting under acid hydrolysis conditions to produce a product suitable for the production of chemicals and / or fuels.

The present invention relates to an improved process for depolymerizing laurolactam with sulfuric acid. A particularly suitable starting material is poly-laurolactam, which is intended for recycling and which is characterized by a low laurolactam content.

A system for producing bioethanol from industrial tea waste, comprising: a substrate processing unit configured to process industrial tea waste by drying and pulverizing; a pretreatment unit configured for the physicochemical treatment of the processed tea waste by steam explosion and acid hydrolysis; a detoxification unit configured to detoxify and neutralize the pretreated tea waste; a fermentation unit configured to ferment the detoxified tea waste under controlled conditions with Saccharomyces cerevisiae; and an ethanol estimation unit configured to measure the ethanol concentration in the fermented product.

The application provides a grafted modified starch, a preparation method thereof and a low-temperature sizing application. The acid hydrolysis starch is used as a raw material, the acid hydrolysis starch has a lower molecular weight, a relatively less hydrogen bond structure in the molecule, a relatively increased porosity of the system, and small molecules are more easily entered into the interior of the starch; the acid hydrolysis starch is modified by using acrylic acid and vinyl acetate, so that the grafted starch has more carboxyl and hydroxyl groups on the molecular structure, the hydrophilicity of the modified starch can be further increased, the starch can be low-temperature gelatinized, the purpose of low-temperature sizing is achieved; then the carboxyl-hydroxyl starch is esterified, and ester groups are introduced, so as to adjust the hydrophilicity and hydrophobicity of the modified starch, the introduction of the hydrophobic groups can reduce the viscosity of the sizing material and improve the fluidity of the sizing material, meanwhile, the introduction of the specific ester groups can also increase the affinity of the gelatinized sizing material to fibers, improve the applicability to various textile fabrics, and solve the problems that the adhesion of the original starch sizing material to the yarn is not strong, and the sizing film is hard and brittle.

The present invention belongs to the field of detection and relates to a method for determining guar gum content. The method comprises: extracting guar gum from reconstituted tobacco leaf base by soaking and shaking with an aqueous solution; evaporating the extract to dryness; decomposing the guar gum into mannose and galactose by acid hydrolysis; and then detecting the mannose and galactose contents by ion chromatography, thereby converting the guar gum content. The method can accurately determine the guar gum content in reconstituted tobacco leaf base and is simple to operate.

This invention discloses a method for determining the content of suberin monomers in the suberized tissue of yam tubers. Suberin is a macromolecular polyester, with monomers mainly covalently linked by oxygen-ester bonds. Its aliphatic compounds are linked to the polysaccharide components in the cell wall by glycosidic bonds and located on the inner side of the cell wall. Therefore, to determine the suberin monomer content, it is necessary to first destroy the plant cell structure, and then hydrolyze the oxygen-ester bonds between the suberin monomers to release the suberin monomer components. This invention first uses ultrasonic pretreatment to destroy plant cells, and then uses lipase hydrolysis combined with ultrasonic assistance and acid hydrolysis (sulfuric acid / methanol) to fully and efficiently hydrolyze the suberin into monomers. The reagents used are relatively safe and non-toxic, and the operation is relatively simple, solving the technical problem of difficult determination of suberin monomer content in the study of suberin metabolism after yam tuber injury healing.

The present invention discloses a method for preparing fuel ethanol from straw biomass and the fuel ethanol, belonging to the technical field of fuel ethanol production. It includes: dissolving and hydrolyzing straw and concentrated sulfuric acid to obtain a saccharified solution, separating out a sugar-rich solution in a simulated moving bed chromatography system, and then mixing it with Saccharomyces cerevisiae SEB3 for fermentation, and generating fuel ethanol through distillation. The method for preparing fuel ethanol from straw biomass provided by the present invention can obtain fermentable sugars under normal pressure and low temperature conditions by using concentrated acid hydrolysis, and has the remarkable advantages of low energy consumption, low toxic by-products, and no need to input cellulase. And Saccharomyces cerevisiae SEB3 is used for fermentation. This strain has the ability of co-fermenting all sugars, can realize the fermentation of all sugars, synchronously convert all sugars into ethanol, the sugar consumption efficiency reaches more than 90%, and the ethanol recovery rate reaches more than 80%, and it is applicable to industrial production.

This invention discloses a method for determining the arsenic content in ores, belonging to the field of ore element detection technology, comprising the following steps: (1) weighing the ore sample, adding hydrochloric acid-nitric acid mixed acid for acid hydrolysis, then adding hydrofluoric acid and perchloric acid for auxiliary digestion, evaporating to near dryness, and dissolving the residue with hydrochloric acid; (2) adding a thiourea-ascorbic acid-citric acid mixed reducing masking agent to reduce and mask interfering ions; (3) using an atomic fluorescence spectrometer to determine the fluorescence intensity of arsenic in the sample solution, and calculating the arsenic content according to the standard curve. This method achieves accurate and stable determination of arsenic in various ores such as phosphate rock and iron ore by optimizing sample pretreatment conditions, improving the reduction system and matrix interference suppression strategy.

An improved process can be used for the acid hydrolysis of polylaurolactam with sulfuric acid. An especially suitable starting material is polylaurolactam which is intended for recycling and which is characterized by a low laurolactam content.

This invention discloses a method for the synthesis of furfural and ethanol from green coconut (Cocos nucifera L.) husk. The method involves chemical reaction for furfural production and a biological fermentation for ethanol synthesis. In the chemical step, the green coconut husk undergoes acid hydrolysis in a high-pressure reactor, yielding furfural. The residual waste from this step is then utilized as a substrate for fermentation by Saccharomyces cerevisiae, producing ethanol. The integrated approach efficiently converts the cellulosic and hemicellulosic components of the green coconut husk into two industrially valuable compounds, furfural and ethanol, from a single agricultural waste stream. The invention provides a cost-effective and environmentally sustainable method for resource utilization and waste reduction.

The utility model relates to the technical field of acidolysis tail gas treatment, in particular to an acidolysis tail gas treatment device which comprises a venturi scrubber, a gas-liquid separator, a filler scrubbing tower, an induced draft fan and an exhaust funnel, and a body consists of an anti-blocking nozzle, a contraction section, a throat pipe and a diffusion section; the gas-liquid separator is composed of a body, a demister, a liquid level detection control instrument and the like. The filler washing tower is composed of a body, filler, a spraying distributor, a demister, a washing tower circulating pump, a washing tower drain pipe, a liquid level detection control instrument and the like. Process water provided by the utility model is only supplemented to the sulfuric acid mist filler washing tower, the washing tower discharges or overflows to the venturi scrubber, and the venturi scrubber is not supplemented with the process water and is only suitable for circulating liquid of the sulfuric acid mist filler washing tower, so that the sulfuric acid concentration and the dust concentration of the circulating liquid of the sulfuric acid mist filler washing tower can be reduced to the maximum extent; the highest absorption efficiency is guaranteed, the possibility of scaling and blocking is avoided, and meanwhile the overall water discharge amount is reduced.