207 results about "Acid production" patented technology

The invention discloses a Weissella sinus strain for improving the fermentation flavor of American ginseng and application of the Weissella sinus strain. According to the present invention, through the comprehensive evaluation of a variety of lactic acid bacteria, including the acid production capacity, the chroma regulation and the flavor characteristic analysis, the optimal strain for the American ginseng fermentation is finally screened, and the strain shows the significant flavor regulation advantage. On one hand, characteristic earthy smell substances of American ginseng can be completely degraded, and the bad flavor of the raw materials is effectively improved; on the other hand, a compound with a fruity flavor characteristic can be specifically generated, and a fermentation product is endowed with a remarkable fragrant and sweet flavor. In addition, the strain disclosed by the invention maintains proper acid production capacity and chroma stability, and the flavor quality is remarkably improved on the premise of ensuring the fermentation efficiency. Due to the characteristics, the strain becomes an ideal fermentation strain for developing a high-quality fermented American ginseng product.

The invention discloses Pediococcus pentosaceus G41, which is separated from rumen fluid of healthy adult dairy cows in a certain cattle farm in Changchun, has the advantages of high growth speed and strong acid production capacity, and can effectively relieve cholestatic liver injury. Experiments prove that the Pediococcus pentosaceus G41 reduces the activity of serum AST, ALT and GDH of a mouse with cholestatic liver injury, reduces the content of total bile acid in blood and liver, increases the content of total bile acid in excrement, and improves cholestatic and dirty injury caused by cholestatic.

The utility model discloses a system for realizing online circulating flow and fermentation of amino acid by adopting a ceramic membrane, which comprises a strain tank, a seed tank arranged on one side of the strain tank, a fermentation tank arranged on one side of the seed tank, a feed pump arranged at the top end of one side of the fermentation tank, a cleaning tank arranged on one side of the fermentation tank, and a circulating pump arranged at the bottom end of one side of the cleaning tank. According to the amino acid on-line circulating flow and fermentation system realized by adopting the ceramic membrane, the culture times of early-stage strain culture and seed tank culture are obviously reduced; the fermentation level is always in a high level state, the acid production rate of thalli is high, the yield is remarkably improved under the condition that equipment is not increased, and the total yield even can reach 2-3 times of the original yield; nutrient substances in the ceramic membrane filtrate can be sterilized after being extracted to serve as nutrient substances to be fed into the fermentation tank, so that the product output ratio of feeding is increased, namely the acid yield is increased; and the ceramic membrane can be sterilized by steam, so that the requirement of sterile equipment is met.

This invention relates to the field of microbial technology, and particularly to a compound lactic acid bacteria fermentation agent and its application, a method for producing *Anoectochilus roxburghii* fermentation broth, and related products. The compound lactic acid bacteria fermentation agent comprises *Lactobacillus plantarum* BXM2, *Lactobacillus fermentatus* J IAN, and *Lactobacillus paracasei* YYS-69. Fermenting *Anoectochilus roxburghii* broth using this compound fermentation agent results in stronger acid production, higher viable bacterial counts, and significantly improved antioxidant activity, total polyphenol and flavonoid content, and enhanced hypoglycemic activity. Sensory effects are also significantly improved. This compound lactic acid bacteria fermentation agent, when applied to the fermentation of traditional Chinese medicine, can enhance the antioxidant capacity and effective functional component content of the fermentation broth, thereby improving efficacy. It has great application prospects in the field of deep-processed *Anoectochilus roxburghii* products and even other fermented medicinal and edible products.

The invention discloses an automatic control method and system for fumaric acid production. The method comprises the following steps: collecting process variables in a fermentation process; constructing a soft measurement model fusing physical modeling and a residual neural network to obtain an acid production rate prediction value and prediction confidence; calculating a feed-forward control quantity, and adjusting the weight according to the prediction confidence to obtain a feed-forward control output; constructing a state vector, and establishing a Markov decision process; training a neural network control strategy by adopting a near-end strategy optimization algorithm, and outputting a proportionality coefficient, an integral coefficient and a differential coefficient; calculating feedback control quantity, fusing the feedback control quantity with feed-forward control output, and applying change rate and amplitude limitation to obtain final control output; and switching to a feedback priority control mode under a specific condition, and regularly updating a soft measurement model and a control strategy parameter. According to the invention, high-precision stable control of pH in the fumaric acid fermentation process is realized, the production efficiency and the process robustness are improved, and the method is suitable for automatic control of the large-scale fermentation process.

The present invention discloses the use of pantothenic acid in the preparation of anticaries preparations related to Streptococcus mutans, and anticaries preparations containing pantothenic acid. The invention belongs to the field of biomedicine technology. The anticaries preparations related to Streptococcus mutans include an acid production inhibitor for Streptococcus mutans, a growth inhibitor for Streptococcus mutans, an inhibitor of cariogenic toxins of Streptococcus mutans, and an inhibitor of interspecies competition of Streptococcus mutans. Pantothenic acid can be used to influence the acid production, growth, production of cariogenic toxins, and interspecies competition of Streptococcus mutans, thereby maintaining the balance of the oral microecology.

The invention discloses antibacterial mouthwash as well as a preparation method and application thereof, and belongs to the technical field of daily chemical products. According to the invention, egg white lysozyme, ferulic acid and grape seed procyanidine are taken as core components, and the mouthwash with an efficient bacteriostatic effect is developed. And the antibacterial rates of streptococcus mutans and porphyromonas gingivalis are 96.88% and 96.30% respectively. Researches show that bacterial biofilms can be destroyed by using the mouthwash, and the biofilm quantity is reduced by 53.7% after the bacterial biofilms are treated for 24 hours; extracellular polysaccharide is inhibited, the content of water-insoluble glucan is reduced by 62.3%, and synthesis of a key cariogenic matrix is hindered; the acid production capacity is regulated and controlled, the pH change of 24-hour culture is only 1.50, and xylitol competitively inhibits glycolysis and cooperates with ferulic acid to block bacterial metabolism. The mouthwash prepared by the invention avoids the problem of enzyme activity inhibition of the ionic surfactant of the traditional mouthwash, takes effect more quickly, and provides a basis for developing natural, safe and efficient functional mouthwash.

The invention belongs to the technical field of acid-making tail gas treatment, and relates to an efficient purification device for acid-making tail gas. The device comprises a tower body, a first connecting plate, a second connecting plate and a rubber elastic pipe, the two ends of the first connecting plate and the two ends of the second connecting plate are connected with rubber elastic pipes. An elastic film is arranged on the inner wall of the air spraying head, and a triggering piece is arranged on the tower body. The lower end of the rubber elastic tube on the first connecting plate is connected with a magnet ball, and the lower end of the rubber elastic tube on the second connecting plate is connected with an iron ball. The rubber elastic pipe is stretched, so that the elastic film bulges in the direction close to the axis of the jet head, the flow area of the jet head is reduced, the jet distance of the jet head is prolonged, acid-making tail gas and alkaline liquid are mixed more uniformly, the reaction efficiency is improved, and the purification efficiency is further improved. And the distance between the adjacent gas spraying heads is increased, so that the gas spraying heads are distributed more dispersedly, and the acid-making tail gas is sprayed into the alkaline liquid more uniformly.

The utility model relates to the technical field of OB acid production, in particular to a convenient-to-discharge hydrolysis kettle for OB acid production and processing, which comprises a vertical reaction kettle body, a bottom discharge valve is mounted at the bottom of the vertical reaction kettle body, and a plurality of side discharge ports which are sequentially staggered from top to bottom are formed in the side wall of the vertical reaction kettle body. A plurality of side discharge ports are formed in the vertical reaction kettle body, a rotary sleeve which is hermetically and circumferentially surrounded on the vertical reaction kettle body is arranged outside the plurality of side discharge ports, a plurality of side discharge pipes which can be communicated with the plurality of side discharge ports one by one are fixedly communicated with the outer part of the rotary sleeve, and side discharge valves are fixedly mounted on the plurality of side discharge pipes. And the discharging accuracy is high, the discharging speed is high, and the production efficiency of the OB acid is further improved.

The invention relates to the technical field of hydrocyanic acid production, in particular to a high-yield hydrocyanic acid chemical process which comprises the following steps: 1) respectively pretreating ammonia gas, natural gas and air, mixing according to a ratio, and inputting into a hydrocyanic acid reactor; (2) carrying out oxidation reaction on the raw material gas under a certain condition under the catalytic action of a platinum alloy net to prepare ammonia-containing hydrocyanic acid gas; 3) performing ammonia removal treatment on the hydrocyanic acid gas to obtain purified hydrocyanic acid gas and an ammonium sulfate solution containing cyanide; 4) carrying out cyanogen removal treatment on the ammonium sulfate solution to obtain mixed gas containing hydrocyanic acid and a cyanogen-free ammonium sulfate solution; according to the method, the area of a platinum alloy net capable of being contained is increased, the reaction area playing a catalytic role is increased, then the reaction efficiency is improved, and the single-line productivity is improved.

The invention discloses an ethanol-tolerant and acetic-tolerant acetobacter pasteurianus strain and application thereof in production of fruit vinegar. The invention provides an acetobacter pasteurianus CL247, the classification name of the acetobacter pasteurianus is Acetobacter pasteurianus, the acetobacter pasteurianus is preserved in China General Microbiological Culture Collection Center (CGMCC) on March 21, 2025, the preservation number is CGMCC No.33924, and the preservation address is Institute of Microbiology, Chinese Academy of Sciences, No. 3, Beichen West Road, Chaoyang District, Beijing. The acetobacter pasteurianus CL247 has the characteristics that the acid yield in 72 hours is greater than or equal to 49 g / L, and the acetobacter pasteurianus CL247 can tolerate 7% acetic acid and 18% ethanol. An efficient, tolerant and stable strain solution is provided for fruit vinegar production, the industry is promoted to be upgraded from'low-efficiency discontinuous' to'efficient continuous', and remarkable technical innovation and economic value are achieved.

The application discloses a preparation method of yellow rice wine, the yellow rice wine and application. The preparation method of the yellow rice wine comprises the following steps: gelatinizing starch raw materials to prepare gelatinized starch; uniformly mixing the gelatinized starch, yellow rice wine starter, acidic protease, saccharomyces cerevisiae, yellow rice wine and water to prepare fermentation material, and performing fermentation; adding lactic acid bacteria at 72h-74h of fermentation, and continuing fermentation; and performing solid-liquid separation after the fermentation is completed, collecting clear liquid, decocting wine, aging, and preparing the yellow rice wine. The preparation method of the yellow rice wine breaks through the technical bottleneck that the metabolic time sequence of strains is uncontrollable in traditional mixed fermentation, optimizes the inoculation time of lactic acid bacteria, guarantees the acid production capacity of lactic acid bacteria under the condition of controlling alcohol metabolism, and obtains the yellow rice wine with the characteristics of high sugar, high acid and high ester, which can be used for seasoning.

The utility model relates to a pyrite acid-making drying tower, and belongs to the field of drying towers, the pyrite acid-making drying tower comprises a tower body, a plurality of inclined plates are arranged in the tower body, the sides, away from the inner wall of the tower body, of the inclined plates incline downwards, a plurality of acid inlet pipes are arranged in the tower body, and a plurality of acid spraying pipes are connected to the acid inlet pipes. The multiple inclined plates divide the tower body into the multiple cavities, the staying time of sulfur-containing furnace gas in the tower is prolonged, and the multiple acid inlet pipes and the multiple acid spraying pipes are arranged, so that the spraying uniformity degree is improved.

The invention belongs to the technical field of biomass energy utilization, and particularly relates to a biogas fermentation system and method. The biogas fermentation system comprises a pretreatment section, a desulfurization section, a hydrolysis section, an acid production section and a methane production section which are sequentially arranged from top to bottom. A discharge pipe at the bottom of the pretreatment section penetrates through the liquid distributor to reach the middle part of the desulfurization section; the return pipe is connected with the liquid distributor through the pump; gas in the hydrolysis section enters the desulfurization section for desulfurization through a gas guide pipe and a floating valve group in the desulfurization section; gas in the acid production section enters the hydrolysis section through a gas guide pipe and a floating valve group in the hydrolysis section to be hydrolyzed; and gas in the methane production section enters the acid production section through a gas guide pipe and a floating valve group in the acid production section to be subjected to acid production treatment. According to the invention, CO2 removal, H2S removal, oxygen removal, ammonia removal, mercaptan removal, halogenated hydrocarbon removal and siloxane removal are carried out on the fermentation system through a plurality of strengthening means, so that high-quality biogas and functionalized biogas slurry are obtained.

The present application belongs to the technical field of microorganisms, and particularly relates to a bacillus licheniformis BL-C15 and application thereof. The present application provides a bacillus licheniformis BL-C15, which is characterized in that the bacillus licheniformis BL-C15 is preserved in the China General Microbiological Culture Collection Center on November 25, 2024, has a preservation number of CGMCC No. 32787, and has a preservation address of No. 3, Xili, Beichen, Beijing, China. The strain has the characteristics of high-alkali tolerance, salt tolerance and acid production, can effectively repair saline-alkali degraded soil, has a significant plant growth-promoting effect, and has important application value in the field of saline-alkali soil repair. The strain can also be used for preparing a microbial product for repairing saline-alkali soil.

This invention relates to the field of oral care products technology, specifically to an artificial enzyme with antibacterial properties, its preparation method, and its application. This technical solution employs a chemical reduction method, where a palladium source reacts in an environment containing surfactants and reducing agents to obtain palladium nanozymes. The obtained palladium nanozymes exhibit uniform morphology, controllable particle size, good dispersibility in water, and good biocompatibility; they have no significant toxic side effects on human gingival fibroblasts, possess highly efficient catalase activity, and demonstrate strong antibacterial and bactericidal effects against oral pathogens, significantly reducing bacterial drug resistance; they can inhibit acid production by oral bacteria, preventing tooth decay; and they retain their original catalytic activity even after multiple cycles of use. Applying the palladium nanozymes of this solution to the manufacture of oral care products can solve the technical problems of unsatisfactory safety and easy development of drug resistance in existing oral care products using antibacterial and anti-caries methods, showing promising application prospects.

The present application relates to a kind of dry method for viscose fiber factory waste gas recovery, including the following sequentially performed steps: (1) waste gas incineration;(2) purification;(3) deacidification mist;(4) drying;(5) sulfur combustion;(6) high temperature furnace gas B is imported into the acid making device to obtain finished product concentrated sulfuric acid.The present application overcomes the shortcomings of existing viscose factory waste gas acid making process equipment, such as easy to be corroded, frequent shutdown, difficult to maintain, low acid production, easy to escape sulfur waste gas, easy to mix furnace gas and external air, low economic benefit, complex process, and many by-products, etc.By adding liquid sulfur mixed combustion, controlling the temperature of each step, setting a booster fan in the front section of the drying tower, a main fan in the rear section, and reasonably arranging the inlet positions of furnace gas and external air, the present application has the advantages of simple process, large-scale acid production, no sulfur waste gas escaping, more environmentally friendly, no mixing of furnace gas and external air, high economic benefit, few by-products, and low maintenance cost.

The utility model discloses a reactor oxidant adding conversion connecting device for manufacturing 2-chloronicotinic acid, which comprises a transition main tank body, feeding through holes are formed in the left part, the right part, the front part and the rear part of a top plate of the transition main tank body, and feeding connecting pipes are fixed on the top surface of the top plate of the transition main tank body corresponding to the feeding through holes; the feeding connecting pipes are aligned and communicated with the corresponding feeding through holes, a horizontal partition plate is fixed to the inner side wall of the upper portion of the transition main tank body, and through holes are formed in the positions, opposite to the feeding through holes, of the horizontal partition plate; a motor fixing frame is fixed to the middle of the top face of a top plate of the transition main tank body, and a rotary servo motor is fixed to the top face of a top plate of the motor fixing frame. The device can be installed on an oxidizing agent feeding port of a reactor, different oxidizing agents can be switched for adding and using according to needs, repeated disassembly is not needed, and the device is very convenient and good in using effect.

The invention belongs to the technical field of solid waste treatment, and particularly discloses a preparation method for increasing the content of soluble calcium in fish bones. The method comprises the following steps: pretreating fish bones to obtain fish bone powder; mixing fish bone meal and water, and sterilizing to obtain a fermentation substrate; according to the method, bacillus subtilis, lactobacillus plantarum and saccharomycetes are adopted for multi-strain sequential fermentation, the bacillus subtilis is inoculated firstly for ventilation fermentation for 2-4 days, the pH is adjusted to 6.5-7.0, then sterilization is performed, a carbon source is added, a mixed bacterium solution of the lactobacillus plantarum and the saccharomycetes is inoculated, and ventilation fermentation is performed for 2-4 days. Through a specific strain combination and an innovative sequential fermentation process, the enzyme production capacity of bacillus subtilis and the acid production capacity of lactobacillus plantarum and saccharomycetes are remarkably improved, dissolution of calcium in fish bones is synergistically promoted, the problem of bitter taste generated by a traditional enzymolysis method is avoided, and the method has the advantages of high efficiency, greenness and complete nutrition retention.

The utility model discloses a micro -channel reactor for chloropropionic acid production belongs to chemical production equipment technical field, including cooling temperature control water tank, the inner wall fixedly connected with equidistance arrangement's micro -channel pipeline of cooling temperature control water tank, the outer surface of every micro -channel pipeline all fixedly communicated with the convex pipe, the outer surface of every micro -channel pipeline all fixedly communicated with the installation turbulence cylinder, the inside of every installation turbulence cylinder all rotatoryly connected with turbulence helical fan blade, the outer surface of every group turbulence helical fan blade all fixedly connected with equidistance circumferential arrangement's limit mobile link. The micro -channel reactor for chloropropionic acid production, through setting up micro -channel pipeline, convex pipe, waterproof solenoid valve and the cooperation of water jet pipe, the flow rate of raw materials is changed to facilitate the mixing of raw materials in micro -channel pipeline, and then the cooperation of cooling temperature control water tank, circulating water pump, connecting pipe and refrigerator is utilized, and the reaction temperature is accurately controlled, the occurrence of side reaction is effectively reduced, and the service life and operating efficiency of the equipment are improved.

The utility model relates to the technical field of flue gas denitration environmental protection, and discloses an acid making and denitration combined treatment system. The system comprises an acid making unit, a denitration device and a third heat exchanger, the acid making unit comprises a first heat exchanger, a second heat exchanger, a conversion device and an absorption device which are sequentially connected along a process gas conveying pipeline, after the process gas containing sulfur dioxide is treated by the acid making unit, sulfuric acid is prepared in the absorption device, and acid making tail gas containing nitric oxide is discharged; the acid-making tail gas from the absorption device firstly enters the third heat exchanger to perform primary heat exchange with the denitrated tail gas from the denitration device, then enters the second heat exchanger to perform secondary heat exchange with the process gas from the first heat exchanger, and then enters the denitration device to perform denitration reaction. The system not only meets the low-concentration emission requirement of nitrogen oxides, but also does not increase the energy consumption of the device.

The invention relates to a potassium type neutralization regulation and control method in a sebacic acid fermentation process and application, a potassium hydroxide solution is used as a neutralizer, sebacic acid generated by microorganisms is neutralized in situ in the fermentation process, a product is accumulated in a high-solubility sylvite form, and the problem of sodion pollution caused by use of sodium hydroxide in a traditional process is avoided. The method comprises the core steps of strain activation, seed solution preparation, fermentation culture medium preparation, fermentation starting, pH dynamic regulation and control and product extraction. By automatically controlling the pH value to be 4.5-6.8, a 20-40% potassium hydroxide solution is fed, so that the fermentation acid production concentration reaches 180g / L or above. A potassium sulfate byproduct which is easy to dissolve in water is generated through subsequent acidification and crystallization, efficient separation can be achieved through washing, and a low-sodium / sodium-free high-purity sebacic acid product is obtained. According to the method, potassium ions are used as necessary elements for microbial growth to optimize a metabolic environment, so that the viscosity of fermentation liquor is remarkably reduced, dissolved oxygen transfer is improved, the environmental protection pressure of downstream extraction is relieved, and the production efficiency and the product quality are improved.

The invention discloses a lactobacillus fermentum FC2, the preservation number of the lactobacillus fermentum FC2 in the China General Microbiological Culture Collection Center is CGMCC No.35910. When the lactobacillus fermentum FC2 is applied to traditional fermented pickles in Yunnan, experimental results show that when the lactobacillus fermentum FC2 is used as a leavening agent to be inoculated into the pickles, the formation of lactic acid bacteria dominant flora in the early stage of fermentation can be accelerated, and the yield of the pickles can be increased. The nitrite level in the fermentation process is obviously reduced; the lactobacillus mucilaginosus FC2 can shorten the ripening time of pickles, improve the acid production efficiency and flavor quality, realize optimal control of the fermentation process, and has significant industrial application value.

The present application belongs to the technical field of microorganisms, and particularly relates to a Limosilactobacillus reuteri HP-B1251 and application thereof. The Limosilactobacillus reuteri HP-B1251 provided by the present application has been preserved in the China Center for Type Culture Collection on August 28, 2024, and the preservation number is CCTCC NO: M 20241872. The strain has good gastric acid tolerance, high temperature tolerance, bile salt tolerance, good acid production capacity, physiological and biochemical capacity suitable for the gastrointestinal tract of the body, and the ability to convert common ginsenosides into rare ginsenosides. At the same time, the biological conversion method has the advantages of strong reaction selectivity, mild conditions, few by-products, simple subsequent treatment process, small environmental pollution, and the like, and is an important way for industrialized production of rare ginsenosides.

The invention discloses a clostridium aerovorans continuous fermentation method based on multi-parameter regulation and control, and belongs to the technical field of microbial fermentation. The method comprises the following parameter control: fermentation culture medium concentration control: in a biomass stabilization stage, gradually reducing the fermentation culture medium concentration from an initial concentration so as to reduce an acid production ratio and improve an alcohol production ratio; the CO content in the tail gas is controlled, wherein the volume fraction of CO in the tail gas is controlled to be 5-10%, and therefore the growth rate of the clostridium aerovorans is increased; dilution degree control: gradually improving the dilution degree so as to improve the fermentation yield; wherein the dilution is equal to the product of the fermentation culture medium feeding speed and 24 / fermentation liquid volume; a ceramic membrane is added, and thalli are intercepted by adding the ceramic membrane, so that the biomass is improved. According to the method, the fermentation acid-alcohol ratio can be regulated and controlled, and the fermentation rate of the clostridium aerovorans is increased.

The application discloses a strain of Staphylococcus carnosus and application of the strain in improving sour taste of soy sauce, and belongs to the technical field of food fermentation. The Staphylococcus carnosus CS1.21 is first isolated from soy sauce mash, and has the characteristics of salt tolerance, strong acid production, ester production and bacteriostasis. The strain is used for fermenting high-salt dilute soy sauce, and can effectively produce lactic acid, acetic acid and succinic acid, and the production of lactic acid, acetic acid and succinic acid is respectively increased by 28.13%, 27.78% and 50.00% compared to the soy sauce without adding the CS1.21. Meanwhile, the accumulation of ester substances is promoted, and the content of the ester substances is increased by 86.23% compared to the soy sauce without adding the CS1.21, wherein the content of ethyl lactate and ethyl acetate is respectively increased by 70.11% and 85.76%. The addition of the Staphylococcus carnosus CS1.21 is beneficial to improving the sour taste of the soy sauce, and can improve the quality and flavor of the soy sauce without adding preservatives.

The invention provides lactobacillus plantarum S7-12, fermented vegetables and application of the lactobacillus plantarum S7-12 and the fermented vegetables, and belongs to the technical field of microbial fermentation, the lactobacillus plantarum S7-12 is preserved in Guangdong Microbial Culture Collection Center, and the preservation number is GDMCC No: 66578. The plant lactobacillus S7-12 has relatively strong growth ability, acid production ability, acid resistance and salt resistance, and fermented vegetables prepared from the plant lactobacillus S7-12 can be used for relieving weight loss and colon shortening caused by inflammatory bowel diseases, reducing disease activity indexes and visceral organ indexes, relieving intestinal mucosa structural damage, relieving oxidative stress injury of colon, and improving the immunity of the vegetables. The release of proinflammatory factors in serum and colon is reduced, the secretion of anti-inflammatory factors is improved, the expression quantity of colon tight junction protein is increased, the TLR4 pathway is activated, and the colon barrier function is improved; the method can be used for preparing health-care foods or medicines, and has a wide application prospect.

The invention discloses a device and a method for realizing stable acid production of an amino acid fermentation kettle by accurately controlling a heat exchange temperature difference, and relates to the technical field of bioengineering. The device comprises a water mixer, a first refrigerant water inlet and a first refrigerant water outlet are formed in the top and the bottom of the water mixer respectively, a second refrigerant water inlet and a second refrigerant water outlet are formed in the two sides of the water mixer respectively, the first refrigerant water inlet is communicated with a refrigerant inlet header pipe, and the first refrigerant water outlet is connected with a refrigerant circulating pump through a pipeline. The refrigerant circulating pump is connected to the first inlet end of the cold using device through a pipeline, the refrigerant inlet header pipe is connected to the second inlet end of the cold using device through a pipeline, the outlet end of the cold using device is communicated with the second refrigerant water inlet, and the second refrigerant water outlet is connected with a refrigerant water return pipe. Large temperature difference can be eliminated, seasonal-difference-free stable high-yield acid production is realized, the fixed flow of a refrigerant is kept, the temperature difference between the refrigerant and a medium in the kettle is accurately controlled, and the upper temperature and the lower temperature of the medium in the kettle are basically consistent.

The invention belongs to the technical field of waste sulfuric acid regeneration and purification, and particularly relates to a waste sulfuric acid regeneration and purification device and method. The waste sulfuric acid storage tank is sequentially connected with a sulfuric acid filter, a sulfuric acid pressure pump, a sulfuric acid heat exchanger, a sulfuric acid atomizer, an adsorption tower, a chain bucket machine, a belt weigher, an analysis tower, a first dust remover, a sulfur-rich fan, a purification washing device, an electric demisting device, a drying tower, an acid-making induced draft fan, a heater, a conversion tower and an absorption tower; the sulfuric acid atomizer is connected with a smoke booster fan, the desorption tower is connected with the backflow end of the hot blast stove and the smoke booster fan through a hot smoke fan, the desorption tower is connected with a nitrogen heat exchanger through a nitrogen pipeline, and a cooling section of the desorption tower is connected with the nitrogen pipeline and a cooling fan. According to the method, sulfuric acid in waste sulfuric acid is circularly adsorbed and analyzed through active coke, and then a qualified sulfuric acid product is produced through the steps of purification, washing, conversion, absorption and the like.

The present invention discloses a treatment agent for removing nitric acid from dilute sulfuric acid and a preparation and use method thereof, belonging to the technical field of coking wastewater treatment. The treatment agent for removing nitric acid from dilute sulfuric acid is composed of a carrier and a reactive component; the carrier is an activated corn cob, and the carrier accounts for 50% to 70% of the total mass of the treatment agent; the reactive component is prepared by mixing ammonium thiocyanate, ammonium thiosulfate, and urea in a mass ratio of 6 to 8:1 to 2:1 to 2. The nitric acid treatment agent is used to treat the mixed acid, thereby increasing the utilization rate of the dilute acid and the yield of ammonium sulfate. The present invention effectively solves the problem of increased operating costs caused by the waste of impure dilute sulfuric acid in waste liquid acid production, equipment corrosion, foaming, and destruction of ammonium sulfate crystals.