428 results about "Saponification" patented technology

The invention discloses an ethylene-vinyl alcohol copolymer and a preparation method thereof, and relates to the technical field of resin. According to the technical scheme, the preparation method comprises the following steps: adding ethylene, low-carbon alkane, alkyl acid ethyl ester, alkyl acid vinyl ester and a carbon-carbon skeleton initiator into a reaction kettle, and carrying out a free radical polymerization reaction; adding a polymerization inhibitor to terminate the reaction, removing low-carbon alkane, unreacted ethylene and alkyl acid vinyl ester, and preparing the reaction liquid into an alcoholic solution; adding a catalyst into the alcohol solution for saponification reaction, and then performing acid pickling, water washing and drying to obtain the ethylene-vinyl alcohol copolymer. The low-carbon alkane which is low in boiling point, easy to vaporize and high in latent heat of vaporization and the saturated alkyl acid ethyl ester with good solubility are adopted as the mixed solvent to replace a traditional alcohol solvent, so that removal and control of reaction heat are facilitated, generation of insoluble gel is reduced, a copolymer with narrow molecular weight distribution is easy to obtain, and the method is suitable for industrial production. The cost that azeotrope formed by the alcohol solvent and the monomer is difficult to separate and recover is greatly reduced, and the production efficiency is improved.

Provided are industrial processes for producing an organic acid alky ester from a feedstock containing organic acids and / or saponifiables, comprising: countercurrently contacting a feedstock with an organic alkylating reagent over two or more vessels or stages at temperature between 100° C. and 400° C. and pressure between 0.1 barg and 355 barg while simultaneously removing water and / or glycerin with unreacted alkylating reagent from the final vessel or stage to result in a first reaction method product containing organic acid alkyl esters, followed by a choice of using the alkyl esters as-is, purifying the organic acid alkyl esters from the first reaction product mixture or subjecting the first reaction product mixture to an additional transesterification reaction to convert saponifiables into additional organic acid alkyl esters, then purifying the organic acid alkyl esters from this second reaction method product.

The invention belongs to the field of steel pipes, and particularly relates to a method for manufacturing a cold drawn pipe, which comprises the following steps of: obtaining a raw material steel pipe which comprises the following elements in percentage by weight: less than or equal to 0.20 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.035 percent of S, less than or equal to 0.30 percent of Cr, less than or equal to 0.50 percent of Ni, less than or equal to 0.10 percent of Mo, 0.05-0.15 percent of V and the balance of Fe; the method comprises the following steps: pretreating a raw material steel pipe, wherein the pretreatment sequentially comprises acid washing, alkali washing, water washing, phosphating, water washing and saponification; and carrying out cold drawing and annealing on the pretreated steel pipe to obtain the cold-drawn pipe. The invention also relates to the cold drawn pipe. According to the method disclosed by the invention, pollution between bath solutions in pretreatment is reduced, the surface quality after pretreatment is improved, and the upper yield strength, tensile strength and normal-temperature impact absorption energy of the cold-drawn pipe are improved, so that the cold-drawn pipe has relatively good toughness and welding performance.

The invention discloses a lubricating process of a surface treatment process of a corrosion-resistant steel member, which comprises the following steps: S1, rust removal: carrying out first rust removal on the steel member by adopting a chemical mode, and then carrying out second rust removal on the steel member by adopting a mechanical mode; s2, oil removal: removing non-saponified oil stains by using an organic solvent, and removing saponified animal and vegetable oil by using an alkaline solvent; s3, phosphate is adopted for phosphating treatment, and a microporous structure layer is formed; s4, spraying is conducted on the steel component, and a metal coating is formed; s5, spraying an organic sealing layer on the metal coating; s6, drying: drying by adopting a dryer or a natural air-drying mode; and S7, sealing pores by using a silane impregnant to form a hydrophobic protection layer. Compared with the prior art, the problems that the protection effect is poor, severe environments cannot be handled and the service life is short due to the fact that anti-corrosion paint is mostly coated on the surfaces of the steel components for protection in existing steel component anti-corrosion treatment can be solved.

The invention relates to the technical field of battery recovery, in particular to a method for separating and recovering metal elements in waste ternary lithium ion battery leachate, which comprises the following steps: A) mixing an extracting agent 2-n-hexyldecanoic acid with a diluent to obtain an extracting solvent; b) mixing the extracting solvent with a saponifying agent to obtain a saponified extracting solvent; c1) mixing the waste ternary lithium ion battery leachate with the saponified extraction solvent, and carrying out single-stage extraction to obtain a raffinate water phase and a loaded organic phase; and D1) mixing the loaded organic phase with a back extraction agent, and carrying out back extraction to obtain a back extraction solution and a blank organic phase. According to the invention, the problems of complex recovery process and difficult separation of calcium and magnesium in the nickel-cobalt-manganese co-extraction process in the prior art are solved, and the recovery of nickel, cobalt and manganese can be realized through one-step selective co-extraction process; the technological process is short and the metal recovery rate is high.

The invention provides a method for recovering lithium from salt lake brine with a high magnesium-lithium ratio. Lithium is extracted through the working procedures of pretreatment, adsorption, desorption, solvent extraction and precipitation, a specific extraction agent is adopted for saponification, a saponified organic phase is prepared, then the saponified organic phase and a lithium-containing desorption solution are extracted, and a raffinate and a loaded organic phase are obtained respectively; carrying out reverse extraction on the loaded organic phase to respectively obtain a lithium-containing concentrated solution and a blank organic phase; and then, mixing the lithium-containing concentrated solution with a precipitant, and carrying out solid-liquid separation to obtain lithium carbonate. According to the method disclosed by the invention, a co-extractant ferric trichloride does not need to be added, so that the problems caused by the co-extractant in the prior art are avoided, and the extraction separation of lithium in a near-neutral pH range is realized; moreover, the pH value of the raffinate is in a near-neutral range (about 7-8), so that the subsequent wastewater treatment difficulty is reduced; in the reverse extraction section, lithium in a loaded organic phase is enriched into a water phase in a phase ratio regulation and control mode, and a lithium carbonate product can be prepared through direct precipitation.

The present invention relates to the mono-saponification of diesters of 2,3,5-trimethylhydroquinone by a base allowing an advantageous synthesis of esterified alpha-tocopherol. The mono-saponification has been demonstrated to occur very selectively at very high yield.

The invention discloses a qualitative and quantitative detection method for vitamin A and vitamin E in food. The qualitative and quantitative detection method comprises the following steps: step 1, pre-treating a sample and accurately adding an isotope internal standard: adding d6-alpha-tocopheryl acetate and d8-retinol acetate into the sample before saponification and preparing a blank matrix; 2, pre-treatment parameter QbD-DOE collaborative optimization, wherein a response surface method is adopted for conducting center composite design on the saponification temperature, time and BHT concentration, and the interaction effect of all the factors is analyzed to determine an optimal operation window; step 3, intelligently optimizing chromatography-mass spectrometry conditions and tuning parameters; step 4, constructing a matrix matching calibration curve and performing WLS quantitative analysis: performing gradient dilution on a standard substance by utilizing a blank matrix extracting solution, adding an isotope internal standard to prepare a 5-7-point matrix matching calibration curve, fitting the curve by adopting a weighted least square method, and verifying the correlation and intercept change of the calibration curve every day; and 5, multi-dimensional qualitative confirmation and intelligent diagnosis system operation.

The application discloses an extraction method of functional fatty acid, which comprises the following steps: dissolving lanolin in an alcohol aqueous solution, adding an excess of strong alkali, and heating to perform saponification to obtain a saponification solution; adjusting the pH of the saponification solution to neutral or weak alkaline by using a strong acid aqueous solution; adding a calcium chloride alcohol aqueous solution to the saponification solution to obtain a calcium fatty acid precipitate, and washing the precipitate with an alcohol aqueous solution; taking the calcium fatty acid precipitate, adding water, and adjusting the pH to strong acidity, and performing acidification under the condition of ultrasonic heating; adding an extraction solvent to perform extraction and separation, removing the water phase, reserving the organic phase, removing the extraction solvent by rotary evaporation, and obtaining the functional fatty acid. The application uses an ultrasonic acidification method to improve the technology of extracting functional fatty acid in lanolin by calcium precipitation, significantly solves the problem of calcium fatty acid acidification difficulty in lanolin, greatly improves the yield and purity of the functional fatty acid, and shortens the production time of the functional fatty acid.

The invention provides an extraction and purification process for producing astaxanthin based on a fermentation method, which specifically comprises the following steps: step 1, preparing materials: selecting shrimp shells, cleaning the shrimp shells, removing impurities doped in the shrimp shells, and then putting the cleaned shrimp shells into a dehydration device for dehydration; step 2, pretreatment; 3, extraction: putting the pretreated shrimp shells into an extraction kettle for extraction; step 4, separation; and step 5, saponification treatment. When the device is used, shrimp shells enter the inner container through the feeding pipe, a cleaning agent enters the water inlet pipe, the cleaning agent enters the inner container through the filtering holes to soak the shrimp shells, and the supporting columns drive the stirring plates to rotate to stir materials during soaking; and in the later period, the supporting column drives the stirring plate to rotate and stir, and meanwhile the materials are conveniently pushed to the position between the connecting cylinder and the discharging cylinder through a scraper on the connecting column.

This invention discloses a method for deep removal of calcium and magnesium from battery-grade manganese sulfate solution, belonging to the field of hydrometallurgical technology. The invention employs a three-stage purification process: pretreatment for impurity removal, gradient precipitation with manganese fluoride, selective extraction, and chelating resin refinement. First, the manganese sulfate leachate undergoes pretreatment to remove iron, aluminum, and heavy metals. Then, an in-situ / direct addition of manganese fluoride precipitation system using magnesium fluoride seeding and gradient fluoride supplementation efficiently removes most calcium and magnesium impurities from the solution, achieving a single-precipitation rate of over 93% for magnesium ions. Subsequently, a P507 / Cyanex272 / TBP compound saponification organic system is used with a reverse extraction logic of "extracting calcium and magnesium while retaining manganese in the aqueous phase" to precisely remove residual calcium and magnesium, avoiding the problems of competition between manganese and calcium and low magnesium extraction efficiency in traditional extraction methods. Finally, trace amounts of calcium, magnesium, and residual fluoride ions are completely removed through aluminum salt complexation for fluoride removal combined with deep refinement using aminocarboxylic acid chelating resin. This invention introduces no foreign impurities such as sodium and ammonium throughout the entire process, has a wide process window and strong industrial stability, and the final purified manganese sulfate solution can stably meet the high-end battery-grade index requirements of Ca²⁺≤5mg / l, Mg²⁺≤5mg / l, and F⁻≤1mg / l, making it suitable for the large-scale production of high-purity manganese sulfate, a raw material for lithium battery cathodes.

Provided is a coating composition which is not susceptible to sagging and is capable of efficiently forming a high-quality coating film protective coating material. Provided is a coating composition for forming a coating film protective coating material, the coating composition containing, as a base polymer, a polymer (A) that is a polymer containing a monomer component of an acrylic monomer, the polymer (A) being in the form of an aqueous emulsion dispersed in an aqueous solvent. The coating composition further contains a polyvinyl alcohol polymer (B) having a degree of saponification of 80 mol% or more and a degree of polymerization of 1200 or less. The content of the polymer (B) is from 0.3 parts by weight to 5.0 parts by weight (inclusive) per 100 parts by weight of the polymer (A). The coating composition has a viscosity of 25 Pa.s or more as measured by a BH-type viscometer under conditions of 30 DEG C and 2 rpm.

The invention relates to the technical field of organic waste resource utilization, and discloses a method for co-production of lactic acid and crude grease by using perishable garbage, and the method comprises the following steps: step a, preparing the perishable garbage into slurry; b, feeding the slurry into an electrochemical reactor for electrochemical treatment; c, carrying out acidification treatment on the generated fatty acid salt to recover crude oil; and step d, carrying out lactic acid fermentation on the residual liquid rich in the small molecular sugar after the crude oil is recovered to obtain the lactic acid. The anode region and the cathode region which are separated by the ion selective diaphragm are arranged in the electrochemical reactor, and acid and alkali are respectively generated in situ in the two regions by utilizing water electrolysis and are directly used for hydrolysis of polysaccharide and saponification of grease, so that chemical reagents such as sulfuric acid and caustic soda do not need to be additionally added; the introduction of extra impurity ions such as sulfate radicals and sodium ions into the system is avoided, the load of subsequent product separation and wastewater treatment is reduced, and the process flow is simplified.

The invention relates to nano-composite low-temperature wind power lubricating grease and a preparation method thereof, and belongs to the technical field of lubricating grease. The invention aims to solve the technical problems of large viscosity change, poor friction surface adsorbability and difficulty in forming a high-strength thick friction film of the existing lubricating grease at low temperature. The lubricating grease comprises the following components in percentage by mass: 0.10%-5% of copper or silver nanoparticles, 0.10%-3.00% of ionic liquid, 5.00%-15.00% of a thickening agent, 1.50%-5.00% of a saponification reactant, 0.10%-0.50% of an antioxidant, 0.01%-1.00% of an antirust agent, 0.10%-0.50% of a demulsifying agent and the balance of base oil, wherein the sum of the mass percentages of the components is 100%. Through the synergistic effect of the nano-particles and the ionic liquid, a composite lubricating film with strong adsorption and high bearing capacity is formed on the surface of a friction pair under the extremely cold condition, so that the lubricating oil still has excellent antifriction and antiwear performance and lubricating stability in the low-temperature environment of minus 40 DEG C or below, and is specially used for long-acting lubrication of wind power bearings, motors and transmission equipment.

The present invention aims to provide a resin composition which, when formed into a film, exhibits reduced occurrence of fisheyes, and a film using the resin composition. A resin composition comprising: 70 parts by weight or more and 98.99 parts by weight or less of two or more types of thermoplastic resins (A) comprising at least a polyolefin, and being derived from a recovered material of a used plastic product; 1 part by weight or more and 29.99 parts by weight or less of a compatibilizer (B); and 0.01 parts by weight or more and 5 parts by weight or less of at least one selected from the group consisting of a fatty acid metal salt (C) or a saponified ethylene-vinyl acetate copolymer (D), provided that a total amount of (A), (B), and (C) and / or (D) is 100 parts by weight.

The invention discloses a quantitative calculation method for the comprehensive utilization rate of acid in a crude fatty acid preparation process, and belongs to the technical field of quantitative calculation of the comprehensive utilization rate of acid, and the quantitative calculation method comprises the following steps: measuring the prepared crude fatty acid and the acid value of a raw material nigre used for preparation, and calculating the amount of substance of acid consumed by acidification reaction after corresponding data is obtained; measuring the acidity of the strong acid in the total process effluent, and calculating the amount of residual acid substance in the total process effluent after corresponding data is obtained; calculating the amount of substance of the acid for neutralizing the excessive monobasic base in the saponification reaction according to the amount of substance of the added acid and the calculated data; and finally calculating the acid comprehensive utilization rate. According to the method, the acid utilization path is analyzed through the technological process, relevant parameters are measured, the quantitative method is constructed, quantitative calculation of the comprehensive utilization rate of the acid is achieved, the method is simple, convenient and easy to operate and achieve, raw material consumption and salinity and acidity in waste water can be remarkably reduced, and the method has great significance in improving the product yield and reducing environmental pollution.

The invention discloses a safe and efficient epoxypropane saponification reaction device and a safe and efficient epoxypropane saponification reaction method. The saponification reaction device comprises an outer wall, and tower plates, a feeding hole and a discharging hole which are arranged in the outer wall, wherein the top pressure of the saponification reaction device is P1, and the kettle pressure of the saponification reaction device is P2, P2gt; the difference value meets the relational expression of 0 kPad; (1), P2-P1 < = 20 kPa. According to the device, the condition that a saponification reaction device is easy to block is greatly improved, the production efficiency is remarkably improved, and the economic advantage is remarkable. In addition, the saponification reaction device also remarkably improves the safety and reduces the accident rate.

A coating composition is provided that is less sensitive to running and can provide a high-quality paint or varnish protective coating material. The provided coating composition comprises a polymer (A) as the base polymer. The polymer (A) is a polymer of a monomer material comprising an acrylic monomer and is in the form of an aqueous emulsion in which the polymer (A) is dispersed in an aqueous solvent. The coating composition further comprises a polyvinyl alcohol polymer (B) with a degree of saponification of 80 mol% or higher and a degree of polymerization of 1200 or lower. The amount of the polyvinyl alcohol polymer (B) is 0.3 parts by weight or more and 5.0 parts by weight or less per 100 parts by weight of polymer (A). The coating composition has a viscosity of 25 Pa·s or higher, determined at 30 °C and 2 rpm using a BH viscometer.

The invention discloses an extraction process of a nickel sulfate solution in a nickel electrodeposition production process. The extraction process comprises an extraction impurity removal system and a reverse extraction washing system, an extraction and impurity removal system is set to be in four stages, nickel sulfate feed liquid before purification enters from a first-stage multiphase flow reactor, organic matter after saponification enters from a fourth-stage multiphase flow reactor, and qualified nickel sulfate solution is obtained through four-stage counter-current extraction and clarification; the reverse extraction washing system is arranged to be in five stages, the first stage is used for nickel washing, the clarified loaded organic matter is sent to the second stage and the third stage to be subjected to countercurrent reverse extraction cobalt washing, the fourth stage and the fifth stage are used for reverse extraction iron washing, cobalt washing acid in a second-stage cobalt washing clarification tank is a cobalt sulfate solution, and the organic matter is saponified and reused after fifth-stage iron washing clarification. The extraction technology overcomes the defects that in the prior art, the separation coefficient and the distribution ratio of nickel and cobalt in an extraction agent are small, nickel and cobalt separation and collection are not thorough, the production technological process is long, the treatment capacity is small, and the occupied area is large. The device has the advantages of good mixing effect, high extraction efficiency, large treatment capacity and large-scale production.

This invention discloses a paint remover for steel-aluminum composite materials, belonging to the field of metal material surface treatment technology. It comprises the following components in weight percentages: 5%-8% alkaline substance; 5%-10% lipase component; 10%-16% solvent; 5%-10% surfactant; 6%-13% co-solvent; 5%-8% corrosion inhibitor; and water as the balance. The paint remover is prepared from alkaline substance, lipase component, solvent, surfactant, co-solvent, corrosion inhibitor, and water. It is used for removing paint from steel-aluminum composite materials. On one hand, the alkaline substance saponifies some groups in the paint, dissolving them in the solvent and water. On the other hand, heating and steaming the paint film reduces its strength and adhesion to the metal. Then, utilizing the wetting, penetration, and affinity effects of the surfactant, the catalytic effect of the lipase component, and the protective effect of the corrosion inhibitor on the steel-aluminum substrate, the goal of removing paint quickly without corroding the substrate is achieved.

The application relates to the technical field of synthetic rubber, in particular to a nitrile rubber, a preparation method and application thereof, wherein the preparation method adopts at least potassium saponification soap and / or sodium saponification soap of disulfated rosin acid, C 10 -C 13 A composite emulsifier system composed of linear alkyl benzene sulfonic acid and naphthalene sulfonic acid formaldehyde condensate sodium salt and a low-temperature emulsion polymerization process, and the obtained nitrile rubber can be used in the field of oil-resistant sealing in a hydraulic oil operation environment.

The invention also provides a briquette comprising:(i) a particulate material; and(ii) a binder, the binder comprising (a) at least partially saponified polyvinyl alcohol and (b) an alkali metal alkyl siliconate or polyalkylsilicic acid; wherein the particulate material is selected from a carbonaceous material, metal, metal ore, mineral waste or a mixture thereof.

The invention discloses a control method for shunt calcium reduction in a rare earth extraction process, which comprises the following steps: a rare earth saponification section is divided into N saponification sections which are connected in series, and N is greater than or equal to 4; saponification organic matter is divided into N / 2 streams, the saponification organic matter obtained after stream division is introduced into saponification sections, the first stream of saponification organic matter is introduced from the first stage of a rare earth saponification section, and rare earth feed liquid is introduced from the last stage of saponification section; and adjusting the shunting proportion of each strand according to the working condition of the rare earth saponification section, controlling the shunting proportion of the first strand of saponification organic matters to be 25-35% of the total flow of the saponification organic matters, and controlling the shunting proportion of the residual saponification sections to be not lower than 15% of the total flow of the saponification organic matters. According to the method, the saponification organic phase is subjected to proportion optimization shunting and introduced into different positions of the rare earth saponification section, local Ca < 2 + > concentration gradient peak clipping is achieved, Ca < 2 + > is distributed in a system in a balanced mode, and therefore the CaSO4 precipitation generation risk is remarkably reduced.

The invention discloses an extraction and saponification system adopting lithium precipitation mother liquor and a saponification method of the extraction and saponification system, and particularly relates to the technical field of extraction and saponification. The extraction and saponification system comprises a static tubular mixer, one end of the static tubular mixer communicates with an extraction agent guide pipe, and one side of the top of the static tubular mixer communicates with a lithium precipitation mother liquor guide pipe; a heat exchange box is arranged on one side of the static tubular mixer, the water outlet end, away from the extraction agent guide pipe, of the static tubular mixer communicates with a heat exchange pipe, one end of the heat exchange pipe penetrates through the heat exchange box to be connected with a flow guide pipe, and one side of the middle of the flow guide pipe communicates with a tubular saponification mixer; the end, away from the heat exchange pipe, of the flow guide pipe communicates with a clarification tank, and an inclined plate assembly is arranged in the middle of the clarification tank. According to the method, part of the lithium precipitation mother liquor is returned for extraction to be used as part of saponification alkali, and a set of equipment facilities are used for matching, so that the consumption of the liquid alkali in the extraction process production can be reduced, and the lithium precipitation mother liquor is recycled.

The invention discloses a preparation method and application of a fluorine-sulfur synchronous removal collector in a magnetite concentrate, wherein step 1 selects 50 80 parts of oleic acid, 10 20 parts of benzohydroxamic acid, and 0 10 parts of lauric acid, and the formed mixture is added to a reaction vessel to carry out saponification reaction; step 2, the saponified product obtained in step 1 is stirred and mixed with xanthate and black medicine to obtain a final collector, which is used for reverse flotation desulfurization and defluorination of magnetite concentrate. The present invention provides a method for preparing a flotation collector for synchronous desulfurization and defluorination of a magnetite concentrate having stable operation, economy, environmental protection, high efficiency and strong adaptability, and provides an application method of the flotation collector.

The invention discloses a synthesis, separation and purification method of N-alkyl-beta-aminopropionate, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: sequentially carrying out addition reaction and saponification reaction on long-chain fatty amine and an acrylate compound to obtain saponification reaction liquid; adjusting the temperature of the saponification reaction solution to 55-70 DEG C, adding water, adjusting the pH value to 3.0-5.0 by using an acid solution, fully stirring, standing for layering, separating out an upper organic layer while the solution is hot, continuously adjusting the pH value of the organic layer to 0.5-1.5 by using the acid solution, cooling to realize layering, separating out an upper product, and neutralizing by using an alkali solution to obtain the N-alkyl-beta-aminopropionate. The method has the advantages of simple operation, short flow, high product separation recovery rate and high purity, can reduce the production cost of the N-alkyl-beta-amino sodium propionate, and meets the industrial production.

Antifog compositions comprising a primary film with opposing principal flat surfaces and a central coplanar region, and processes for manufacturing such compositions. The central coplanar region is located between the opposing principal flat surfaces. The primary film comprises cellulose acetate, a plasticizer, and an antiblocking agent. The antiblocking agent has an average particle size ranging from 0.02 microns to 6 microns. The cellulose acetate exhibits a degree of substitution that increases from the opposing principal flat surfaces toward the central coplanar region, or remains practically constant throughout the thickness of the composition. The composition is formed by saponifying a precursor film to enhance its hydrophilicity.

The application discloses an anti-permeation low-shrinkage inorganic coating and a preparation method thereof. The anti-permeation low-shrinkage inorganic coating comprises cement material 40-60 parts by mass, active mixed material 15-30 parts by mass, gypsum 5-15 parts by mass, talcum powder 5-15 parts by mass, glycerin stearate 0-2 parts by mass and additive 4.7-6.7 parts by mass. The application selects green inorganic material, combines the characteristics of slow hydration of low-heat Portland cement, micro-expansion of high-magnesium low-heat Portland cement and micro-expansion of ettringite-like product formed between gypsum and cement hydration product, uses micro-expansion to relieve the shrinkage problem of the material, makes the material form a dense structure, and makes the material have the hydrophobic anti-permeation characteristics through the saponification reaction of glycerin stearate under alkaline conditions.

The utility model relates to the technical field of reaction kettles, in particular to a saponification reaction kettle for producing sodium alkyl hydroxamic acid, which comprises a suspended cover, a kettle body, a stirring motor and a scraping mechanism, and the scraping mechanism comprises a sleeve shaft, a stirring plate, a connecting rod, a shifting sleeve and a shifting cylinder. In the scraping mechanism, a sleeve shaft is fixed to the rotating shaft, a stirring plate is provided with a scraping strip, a connecting rod is hinged to be deformable, and a shifting sleeve is matched with a shifting air cylinder. When scraping is needed, the shifting cylinder drives the shifting sleeve to slide downwards, the scraping strip is attached to the inner wall of the kettle body to remove impurities, and when scraping is not needed, the shifting sleeve moves upwards to drive the scraping strip to be away from the inner wall, and friction loss is reduced. According to the reaction kettle, through the scraping mechanism, the cleanness in the kettle can be ensured, the reaction effect and the product quality are improved, the abrasion of parts can be reduced, the service life of equipment is prolonged, and the maintenance cost is reduced.