45results about How to "Reduce corrosion loss" patented technology

The invention discloses a frostless air source heat pump device and method based on membrane method dehumidification and indoor regeneration humidification. The frostless air source heat pump device comprises a refrigerant circulation loop and a solution dehumidification / humidification circulation loop. The refrigerant circulation loop comprises a compressor (1), a four-way reversing valve (2), an indoor heat exchanger (3), a regeneration condenser (4), a throttling valve (5) and an outdoor heat exchanger (6) which are sequentially connected together in series through a first communication pipeline. The solution dehumidification / humidification circulation loop comprises a heat recovery heat exchanger (10), a regeneration condenser (4), an indoor humidification membrane assembly (11), a heat recovery heat exchanger (10), an outdoor dehumidification membrane assembly (7) and a dehumidification solution storage tank (8). According to the frostless air source heat pump device and method based on membrane method dehumidification and indoor regeneration humidification, outdoor air latent heat is converted into sensible heat through the dehumidification membrane assembly, frosting is avoided, and moisture introduced through a dehumidification solution is regenerated and used for indoor humidification.

The embodiment of the invention discloses a method for cleaning crystalline silicon, which comprises the following steps: placing crystalline silicon in pure water to carry out ultrasonic or mega-sound heating pre-cleaning; placing the crystalline silicon in a mixed acid solution to carry out corrosion; cleaning the crystalline silicon by the pure water; and drying the crystalline silicon. The crystalline silicon cleaning method adopts a combination manner of physic cleaning and chemical cleaning to clean the crystalline silicon, can effectively remove the impurities and particles on the surface of crystalline silicon (especially reclaimed materials) and can reduce the amount of the chemical solution, the damage of the chemical solution to the human body, equipment and environment, the corrosion loss of the chemical solution to the crystalline silicon and the follow-up treatment of the waste solution, thereby reducing the cleaning cost.

The invention discloses a method for preparing magnesium potassium titanate by directly utilizing magnesium oxide, belonging to the technical field of inorganic material preparation. The method is mainly characterized in that: magnesium oxide, titaniferous compound and potassium titanate are directly taken as raw materials, the raw materials are mixed to be uniform, the mixture is calcined for 30 minutes to 24 hours at high temperature of 900-1300 DEG C, magnesium potassium carbonate (K2MgTi4O10, namely K2O. MgO. 4TiO2) can be prepared by one-step synthesis, and the obtained magnesium potassium carbonate after calcination is smashed, thus the finished product is obtained. Magnesium oxide is utilized as a reaction raw material, material cost is reduced, no fluxing agent is used in the preparation process, and no alkali magnesium raw material is used, thus rapid equipment corrosion loss in the high temperature alkali environment is reduced in the preparation process of the magnesium potassium titanate, the method is more applicable to mass production, and the process is simplified; meanwhile, calcination under microwave catalysis is utilized to speed up synthetic reaction of the magnesium potassium titanate, thus the production efficiency is improved.

The invention provides a method for removing fluorine, chlorine and valuable metals in secondary zinc oxide, which solves the problems of low removal rate, high energy consumption, low environment friendliness and low economical efficiency in the prior art. According to the method, high-fluoride / chloride secondary zinc oxide used as a raw material is granulated, aired and subjected to rotary kiln roasting, flue gas is settled and subjected to dust collection, the roasted product is subjected to indirect water cooling, and a mixed air heating process is adopted by using natural gas as a heat source, thereby removing the fluorine, chlorine, lead and indium and implementing reenrichment of indium, lead and other valuable metals. The roasting process is utilized to remove most of fluorine, chlorine, lead and indium; the lead and indium are enriched in the roasted dust, thereby solving the problem of later processing of the high-fluoride / chloride secondary zinc oxide; and the method has the advantages of fewer required technical processes, high efficiency, smooth procedure, high degree of mechanization and the like, and greatly enhances the environmental and economic benefits.

The invention discloses a control method for cathode protection of high-voltage direct-current transmission grounding electrodes. Improvement is performed on the basis of a direct-current transmission project constant current control manner, according to forward current detection results of the grounding electrodes, first-electrode current value deviation changes to be positive and negative alternately, alternate cathode protection of the sending end and receiving end grounding electrodes is achieved, corrosion losses of the grounding electrodes are reduced, the service life of the grounding electrodes is greatly prolonged, and the problem that the grounding electrodes are seriously corroded due to unbalanced current and the like is solved. The existing high-voltage direct-current transmission project constant current control manner is used, the manner is finely adjusted, the investment cost of a control protection system is not increased, the corrosion losses of the grounding electrodes can be greatly reduced, the service life of the grounding electrodes is prolonged, and the control method can be applied to a practical high-voltage direct-current transmission project.

The invention discloses a multi-sulfonic acid funtionalized mesoporous polymeric solid acid catalyst and a preparation method thereof and an application of the catalyst in high-efficiency catalysis of an esterification reaction between free fatty acid and short-chain alcohols (ethanol and methanol) and catalysis of one-pot preparation of biodiesel from high acid-value grease and methanol. The preparation method of the catalyst comprises the following steps: mesoporous polydivinylbenzene is used as a carrier, and the carrier firstly reacts with chloromethyl methyl ether to introduce the carrier into chloromethylene; then, a product reacts with ethene diamine to make the carrier to be linked in the form of a covalent bond with ethene diamine; and finally, chlorosulfonic acid is used to carry out sulfonation so as to obtain the multi-sulfonic acid funtionalized mesoporous polymeric solid acid catalyst. The mesoporous polymeric solid acid catalyst obtained by the preparation method has a lot of mesoporous pore structures, large specific surface area and pore volume and high acid density. The catalyst is applied in catalysis of an esterification reaction between free fatty acid and short-chain alcohols (ethanol and methanol) and catalysis of one-pot preparation of biodiesel from high acid-value grease and methanol, and has a high catalytic activity. Thus, the catalyst has good industrial application value.

The invention relates to the synthesis and application technology field of compounds used for metal anticorrosion, and concretely discloses a novel rosin imidazoline corrosion inhibitor, a synthetic method and applications. The initial raw material of the provided compound is rosin acid, the raw material is single and the synthetic route operation is simple. The method for preparing a corrosion inhibitor from the synthesized compound is simple, the compound is dissolved in dimethyl formamide, then the obtained solution is dissolved in water, then 1-hydroxyethylidene-1,1-diphosphonic acid is added, and uniform stirring is carried out. The corrosion inhibitor is safe and environmentally friendly, and has excellent corrosion inhibition effects. The corrosion inhibitor can be used for oil and gas field ground gathering and storage and transportation pipes, prevents damage of corrosive gases to metal materials of steel and the like and reduces corrosion loss.

The invention discloses a preparation method of a wear-resistant and corrosion-resistant steel ball for a ball mill. The preparation method comprises the following steps that raw materials of a steelball base body are heated and smelted, cast, heated and rolled into balls in an electric furnace, and the steel ball base body is obtained after cooling; NiAl alloy powder and graphene-oxide-coated silicon carbide whiskers are evenly mixed, a middle bonding layer is formed on the surface of the steel ball base body through plasma spraying, and a primarily-coated steel ball is obtained; Cr2O3 powder and SiO2 powder are evenly mixed, the mixture is sprayed to the surface of the primarily-coated steel ball through plasma to form a surface coating layer, and a secondarily-coated steel ball is obtained; and hot isostatic pressing treatment is performed on the secondarily-coated steel ball, and then low-temperature tempering is performed to obtain the wear-resistant and corrosion-resistant steelball for the ball mill. The steel ball prepared with the method has excellent wear resistance and corrosion resistance, low corrosion loss and long service life, and is applicable in application environments of corrosive media such as mines and the like.

The invention discloses preparation of a wastewater treatment agent and an application method thereof. At present, extensive attention of researchers is paid to a heterogeneous Fenton technology in the field of organic wastewater treatment. Due to low cost and high catalytic activity, nanometer pyrite has excellent application potential in the heterogeneous Fenton field. However, separation and recovery of the nanometer pyrite from a liquid phase need to use ultrafiltration, nanofiltration and other high-energy-consumption means, and the cost is high; the nanometer pyrite Fenton system is lowin effluent pH value and high in iron content, and has relatively high environmental risk. By virtue of the fixation effect of sodium alginate gel on nanometer pyrite grains and the cross-linking effect of sodium alginate molecules and iron ions, the wastewater treatment agent with advantages of being easy to separate and low in cost is prepared in the invention. The agent prepared in the invention has the advantages that the defect that the nanometer pyrite is difficult to separate is effectively overcome, and the environmental risk of the nanometer pyrite is weakened. By adopting the wastewater treatment agent prepared in the invention and the application method thereof, organic wastewater can be effectively treated, and the agent has wide application prospects.

The invention relates to a canned pear and a preparation method thereof. The preparation method comprises the following pear peeling steps that (1) an alkaline solution with a concentration of 4-18% (by weight) is prepared by mixing sodium hydroxide and / or potassium hydroxide, and adding a peeling activator containing fatty acids and / or tallates to the alkaline solution to obtain an alkaline peeling liquid; wherein the adding amount of the peeling activator is 0.1-1% (by weight) of the alkaline solution; (2) the to-be-peeled pear makes contact with the alkaline peeling liquid; wherein the temperature of the alkaline peeling liquid is controlled at 55-75 DEG C. The method can quickly peel the pear at relatively low temperature without or less hurting the pear flesh, and the initial color and flavor of the peeled pear can be well preserved.

The invention discloses an anti-floating probe loading device for a marine surveying and mapping unmanned ship, and relates to the technical field of ocean exploration. The anti-floating probe loading device comprises a detection probe, and comprises a ship-borne supporting device and a L-shaped supporting plate hinged to the ship-borne supporting device; a floating adjustment installation device is installed at the lower end of the L-shaped supporting plate; the detection probe is installed on a flange plate at the lower end of the floating adjustment installation device; the floating adjustment installation device comprises an upper adjustment assembly and a lower adjustment assembly; and the ship-borne supporting device comprises a sliding groove and a moving sliding platform slidably matched with the sliding groove. According to the anti-floating probe loading device for the marine surveying and mapping unmanned ship, through the designed ship-borne supporting device, the L-shaped supporting plate and the floating adjustment installation device, the device can be received on the unmanned ship when not in use, and the device is easy to place and operate when in use; and moreover the problem that the detection accuracy of the fixed probe is affected by the turbulence of shallow water level in sea water when waves are large can be solved, and the problem that the detection accuracy is affected by an existing fixed position probe is solved.

The invention discloses a device for painting make-up of the bottom of a ship during sailing of the ship. The device comprises a hull, a fixing block is arranged on the hull, a penetrating cavity penetrating in the left-right direction is formed in the upper surface of the fixing block, a first motor is fixedly arranged in the front wall of the penetrating cavity, the rear end of the first motor is in power connection with a motor shaft, a rotating block is fixedly connected to the motor shaft, a through cavity is formed in the front surface and the rear surface of the rotating block in a penetrating mode, the right end of the rotating block is fixedly connected with a connecting block, a gear cavity is formed in the upper side inside the connecting block, and a first rotating shaft with the left end stretching into the through cavity is arranged in the left wall of the gear cavity in a penetrating mode. Painting make-up operation can be conducted on the ship bottom of the ship in long-distance sailing, the situation that painting make-up cannot be completed due to the fact that the ship cannot reach a shore is avoided, the corrosion loss of the hull is reduced, meanwhile, the safety of the hull is improved, the whole operation process is simple, operation is convenient, and the device is very practical and worthy of being popularized.

The invention discloses a corrosion method of a germanium gallium arsenide (GaAs) single crystal dislocation pit and a corrosion solution formula, which relates to the technical field of chemistry process. The method comprises the following steps: polishing an observation surface comprising a to-be-detected GaAs{100} wafer with a crystal orientation deflection angle in a preset deflection angle range,and to obtaining the to-be-detected wafer; preparing a mixed solution of hydrofluoric acid, hydrogen peroxide and deionized water according to a preset ratio as a corrosion solution, and placing the corrosion solution in a corrosion trough; placing the corrosion trough in a water-bath pot with an ice-water mixture, and keeping the temperature of the corrosion solution in the corrosion trough at 3 to 8 DEG C; starting a light source, and enabling the light to shine on the bottom of the corrosion trough; and placing the to-be-detected wafer on a hollowed base, placing the hollowed base in the corrosion trough, enabling the to-be-detected wafer on the hollowed base to be in an illumination range of a cold light source in the corrosion trough, soaking the to-be-detected wafer with the corrosion solution, and reacting for 30 to 50 minutes. By adopting the corrosion method, the breaking of the wafer in the corrosion process can be avoided, and the corrosion amount can be reduced.

The present invention discloses a lauryl betaine preparation method, which comprises: a, adding ethyl 2-(p-toluenesulfonyloxy)acetate andacetone or methanol to a reactor, and completely and uniformly stirring to obtain a mixture; b, adding dodecyl dimethyl dimethylamine to the mixture in a dropwise manner while stirring, and heating and carrying out a complete stirring reaction after completing the adding; c, after completing the substitution reaction, distilling under a conventional atmospheric pressure to remove half of the solvent, adding p-toluenesulfonic acid aqueous solution having a mass concentration of 15-20%, and continuously heating and carrying out the stirring reaction; and d, after completing the hydrolysis reaction, distilling to remove the majority of the solvent, removing impurity ions from the residue by using an ion-type macroporous adsorption resin to obtain a lauryl betaine aqueous solution, and distilling under a conventional atmospheric pressure to remove the water to obtain the viscous liquid lauryl betaine. According to the present invention, with the method, the high quality lauryl betaine can be prepared, and the product equipment corrosion loss can be reduced.

The invention provides an efficient heat transfer tube of a heat exchanger for recycling smoke waste heat, which consists of an inlet header, a vertical serpentine pipe, a spike tooth rib column which is provided with annular grooves and arranged obliquely, and an outlet header. The heat exchanger mainly solves three problems: 1, the vertical serpentine pipe is adopted to reduce wearing speed; 2, the spike tooth rib column is arranged obliquely to make dust in the smoke fall naturally; and 3, in order to increase the heat exchange area to a large extend and increase the disturbance of the smoke and the residence time in a flue, the spike tooth rib column is provided with two annular grooves. The invention reduces a part of wear, prevents dust accumulation, and increases the heat transfer area, and the method is simple, is easy to implement, can significantly prolong the service life of the heat exchanger of a waste heat boiler, reduces the volume of the waste heat boiler and saves materials.

The invention discloses aluminum alloy corrosion inhibition curing film forming liquid. The aluminum alloy corrosion inhibition curing film forming liquid is prepared from, by weight, 100-110 parts of bis(gamma-triethoxy silicon propyl) tetrasulfide, 10-12 parts of butyl titanate, 3-5 parts of multi-walled carbon nanotubes, 0.8-1 part of cerium nitrate, 0.3-1 part of trimethylolpropane, 0.08-0.1 part of polytetrafluoroethylene, 3.5-4 parts of polyvinyl formal, 1-2 parts of allylthiourea, 0.3-1 part methyl 4-hydroxybenzoate of and 2-3 parts of hydrogenated castor oil. Allylthiourea, methyl 4-hydroxybenzoate and the like which are added in a curing film have a very good corrosion inhibition effect, and corrosion losses can be reduced.

The invention discloses a method for preparing magnesium potassium titanate by directly utilizing magnesium oxide, belonging to the technical field of inorganic material preparation. The method is mainly characterized in that: magnesium oxide, titaniferous compound and potassium titanate are directly taken as raw materials, the raw materials are mixed to be uniform, the mixture is calcined for 30 minutes to 24 hours at high temperature of 900-1300 DEG C, magnesium potassium carbonate (K2MgTi4O10, namely K2O. MgO. 4TiO2) can be prepared by one-step synthesis, and the obtained magnesium potassium carbonate after calcination is smashed, thus the finished product is obtained. Magnesium oxide is utilized as a reaction raw material, material cost is reduced, no fluxing agent is used in the preparation process, and no alkali magnesium raw material is used, thus rapid equipment corrosion loss in the high temperature alkali environment is reduced in the preparation process of the magnesium potassium titanate, the method is more applicable to mass production, and the process is simplified; meanwhile, calcination under microwave catalysis is utilized to speed up synthetic reaction of the magnesium potassium titanate, thus the production efficiency is improved.

The invention relates to the technical field of environmental monitoring, in particular to a morphological testing method and a morphological testing device for mercury in full-flow high-SO2 flue gas of a stationary pollution source. The invention provides a method for testing mercury in full-flow flue gas of a stationary pollution source. The method comprises the following steps: collecting mercury in the flue gas through an impact type absorption bottle box; and different absorption bottle combinations are adopted based on different pollution control nodes. By analyzing flue gas components and pollution control nodes in different industries, adjusting the type and concentration of the absorption liquid and screening a proper absorption bottle combination mode on the basis of the existing OH method, the adsorption influence of SO2 on elemental mercury is reduced to the greatest extent, the monitoring accuracy is improved, meanwhile, the post-treatment process of the absorption liquid is simplified, and the production cost is reduced. The treatment cost is reduced. Compared with the existing OH method, the testing method disclosed by the invention not only has good consistency and stability, but also is more flexible in monitoring means and more reasonable in cost, and meets the flue gas mercury monitoring requirements of various complex flue gas systems.

The invention provides a sulfur tetrafluoride synthesis method and a reaction system, and relates to the technical field of chemical engineering. The sulfur tetrafluoride synthesis method comprises the following steps: fluorine gas and liquid sulfur are subjected to a gas-liquid reaction to generate sulfur tetrafluoride, the reaction pressure is 90-120KPa, and the distance between an outlet of the fluorine gas and the liquid level of the liquid sulfur during the reaction is 3-10mm. The method has the advantages that by controlling the reaction temperature, the reaction pressure and the gas-liquid distance, high-quality, stable and high-yield sulfur tetrafluoride can be realized, and the benefit maximization is realized.

The invention discloses a neutralization solution for surface pretreatment of aluminum and aluminum alloy, and belongs to the technical field of metal surface treatment. The neutralization solution comprises an oxidant, a fluorine-containing compound, a stabilizer, a promoter, acid, a surfactant and water. The neutralization solution can effectively remove various harmful impurities and dirt produced after alkaline etching treatment in a pretreatment process for aluminum and aluminum alloy containing silicon or not containing silicon, is good in neutralization effect, stable in quality and favorable for subsequent treatment, and can form a uniform and activated surface. Meanwhile, a problem that the environment is severely polluted by a large amount of nitric acid and hydrofluoric acid in a conventional neutralization solution is solved.

The invention provides a power supply control circuit for preparing a disinfectant through direct-current electrolysis in a slightly alkaline environment. The power supply control circuit comprises alow-voltage direct-current power supply and an electrode plate array connected with the low-voltage direct-current power supply; the low-voltage direct-current power supply supplies power to the electrode plate array; the output voltage of the low-voltage direct-current power supply is 1V-24V; the electrode plate array is composed of a net-shaped anode and a net-shaped cathode which are closely arranged in parallel; the distance between the net-shaped anode and the net-shaped cathode ranges from 0.5 mm to 2.5 mm; brine between the anode and the cathode can freely flow so that the pH value range of the liquid environment in the electrolysis process can be maintained to be 8 and 10. When saline water is electrolyzed, the low-voltage direct-current power supply detects current output by the electrode plate array; when the liquid level of the saline water descends, and the area, exposed from the liquid level, of the electrode plate array is larger than a threshold value, the variable quantity of the current output by the electrode plate array is larger than the threshold value, and the power supply control circuit stops supplying power to the electrode plate array. According to the power supply control circuit, domestic disinfectant fluid can be prepared by the diaphragm-free brine electrolysis method, the problem of gas deflagration of the diaphragm-free brine electrolysis methodis solved, and the product can be safely used for domestic hygiene disinfection.

The invention discloses a multi-sulfonic acid funtionalized mesoporous polymeric solid acid catalyst and a preparation method thereof and an application of the catalyst in high-efficiency catalysis of an esterification reaction between free fatty acid and short-chain alcohols (ethanol and methanol) and catalysis of one-pot preparation of biodiesel from high acid-value grease and methanol. The preparation method of the catalyst comprises the following steps: mesoporous polydivinylbenzene is used as a carrier, and the carrier firstly reacts with chloromethyl methyl ether to introduce the carrier into chloromethylene; then, a product reacts with ethene diamine to make the carrier to be linked in the form of a covalent bond with ethene diamine; and finally, chlorosulfonic acid is used to carry out sulfonation so as to obtain the multi-sulfonic acid funtionalized mesoporous polymeric solid acid catalyst. The mesoporous polymeric solid acid catalyst obtained by the preparation method has a lot of mesoporous pore structures, large specific surface area and pore volume and high acid density. The catalyst is applied in catalysis of an esterification reaction between free fatty acid and short-chain alcohols (ethanol and methanol) and catalysis of one-pot preparation of biodiesel from high acid-value grease and methanol, and has a high catalytic activity. Thus, the catalyst has good industrial application value.

The invention relates to a seamless anti-seismic abutment with a separation type butt strap. The seamless anti-seismic abutment with the separation type butt strap comprises a transverse partition beam, a pier, a pile foundation, a retaining wall and a sleeper beam, wherein the transverse partition beam is positioned on the pier; the pier is positioned on the pile foundation; the sleeper beam is positioned behind the retaining wall; the seamless anti-seismic abutment with the separation type butt strap further comprises the separation type butt strap; one end of the separation type butt strapis placed on the sleeper beam; and the other end of the separation type butt strap is seamlessly connected with the transverse partition beam. According to the seamless anti-seismic abutment with theseparation type butt strap, lower cost and better economy are achieved.

The invention belongs to the technical field of enamel materials and particularly relates to a porcelain glaze, an enamel coating of a copper product, and a preparation method of the enamel coating ofthe copper product. Aiming at the problem of poor corrosion resistance of the copper product in high-concentration seawater, silt or an NH3(NH4+) containing salt system, the invention provides the porcelain glaze and the enamel coating prepared from the porcelain glaze. The porcelain glaze comprises 20-22 parts of feldspar, 5-8 parts of quartz sand, 2-4 parts of creta, 24-26 parts of borax, 1.5-2parts of sodium nitrate, 0.5-1 part of potassium dichromate, 2-3 parts of Al(H2PO4)3, 1-1.2 parts of Li2CO3, 5-7 parts of fluorite, 3-5 parts of cryolite, 0.1-0.3 part of sodium fluosilicate, 0.5-1.0part of iron pyrite, 2-4 parts of Sb2S3, 0.5-1 part of Na2MoO4, 3-4 parts of cobalt nitrate, and 1-2 parts of nickel nitrate. The porcelain glaze, the auxiliaries and water are mixed, then sprayed onthe surface of the copper product, and enameled to obtain the enamel coating. The obtained enamel coating is firmly combined with a matrix of the copper product, the corrosion resistance is good, andthe service life is long.

The invention discloses a synthetic method for the rubber cross-linking agent cyclohexanone peroxide. The synthetic method comprises the following steps: adding cyclohexene and a potassium nitrate solution into a reaction vessel, controlling a solution temperature to be 15-22 DEG C, controlling a stirring speed to be 210-230 rpm, adding a 1,2-propanediol solution and lead tetraacetate, adding a methyl tert-butyl ether solution in batches within 30-50 min, and continuing a reaction for 80-120 min; and adding nickel oxalate powder, controlling the stirring speed to be 290-330 rpm, continuing a reaction for 2-3 h, lowering the temperature to 5-9 DEG C, adding a sodium sulfate solution, subjecting the solution to layering to separate an oil layer, carrying out washing with a hexane solution for 30-50 min, then carrying out recrystallization in a butyl ether solution, and carrying out dehydration with a dehydrating agent so as to obtain the finished cyclohexanone peroxide.

The present invention proposes a power supply control circuit for preparing disinfectant by DC electrolysis in an alkaline environment, including a low-voltage DC power supply and an electrode sheet array connected thereto; the low-voltage DC power supply supplies power to the electrode sheet array and the output voltage is 1V~24V; The electrode sheet array is composed of mesh anodes and mesh cathodes arranged in close parallel with a spacing range of 0.5mm~2.5mm. The brine between the anodes and cathodes can flow freely to maintain the pH range of the liquid environment during the electrolysis process at pH8~pH10; When electrolyzing salt water, the low-voltage DC power supply detects the current output by the electrode array. When the liquid level of the brine drops and the area of ​​the electrode array exposed to the liquid surface is greater than the threshold value, the change in current output by the electrode array is greater than the threshold value. Power supply The control circuit stops the power supply to the electrode sheet array; the invention can prepare household disinfectant water by electrolysis of salt water without diaphragm, and solves the problem of gas deflagration in the electrolysis of salt water without diaphragm, so that the product can be safely used for household sanitation and disinfection.

The invention provides an extruder stagnant oil purification device and a recovery and purification method thereof. Recyclable purified stagnant oil is prepared through the steps of impurity removal,precipitation, water removal, refining and purification, and the problems that stagnant oil resources are wasted and the environment and production are affected are solved. Besides, an impurity removal unit, a precipitation unit, a water removal unit, a refining unit and a purification unit are arranged in the purification device in one-to-one correspondence with the steps in the purification method. The corrosion loss of production can be reduced, and the separation efficiency of oil, water, particles and impurities is high. The purification device is simple and convenient to use. The stagnant oil can be automatically recycled as long as the purification device is started and purification conditions are set. The automation degree is high, and manual operation is reduced.

The invention discloses a method for preparing dodecyl betaine. The following steps are adopted: a. adding 2-p-toluenesulfonyloxyethyl acetate, acetone or methanol into a reactor and fully stirring to obtain a mixture; b. Add dodecyldimethylamine dropwise to the mixture while stirring, and heat up to fully stir the reaction after the addition is complete; c. After the substitution reaction is completed, half of the solvent is distilled off under normal atmospheric pressure, and the mass concentration of the addition is 15- 20% aqueous solution of p-toluenesulfonic acid, and then continue to heat up and stir the reaction; d. After the hydrolysis reaction is completed, remove most of the solvent by distillation, and the residue is removed by ionic macroporous adsorption resin to obtain dodecane Base betaine aqueous solution, distilled off water under normal atmospheric pressure to obtain a viscous liquid dodecyl betaine. The beneficial effects of the invention are: high-quality lauryl betaine can be prepared, and corrosion loss of product equipment can be reduced.