39 results about "Tin(IV) chloride" patented technology

The present invention is a visible light responsive CO 2 The invention discloses a method for preparing a photocatalyst, which belongs to the field of photocatalytic reduction technology. The method comprises: step 1) preparing SnO from a tin chloride solution and a sodium hydroxide solution; 2 ‑NPs; Step 2) SnO 2 ‑NPs, 2‑methylimidazole solution, Zn(NO 3 ) 2 6H 2 T‑ZIF‑8@SnO was prepared from O solution. 2 The method of the present invention generates an interface effect between different components through a heterogeneous structure, thereby generating different catalytic reaction adsorption sites, thereby affecting the activity, selectivity and stability of the catalyst. 2 The powder size is uniform, the light response wavelength can reach 760nm, and it is sensitive to CH 4 The selectivity can reach 77%.

The invention discloses a preparation method of an alpha-Fe2O3 / SnO2 nanoneedle heterojunction gas sensitive material, and belongs to the technical field of preparation and application of inorganic composite materials. Adding a mixed solution of ferric chloride and sodium sulfate and the ceramic tube into a reaction kettle, carrying out hydrothermal reaction at 120-160 DEG C for 10-14 hours, taking out the ceramic tube after the reaction is finished, drying and annealing to obtain a ceramic tube loaded with alpha-Fe2O3 nanoneedles; dissolving tin chloride and urea in water to obtain a mixed solution, adding the mixed solution and the ceramic tube loaded with the alpha-Fe2O3 nanoneedle into a reaction kettle, carrying out hydrothermal reaction at 80-100 DEG C for 1-6 hours, taking out the ceramic tube after the reaction is finished, drying and annealing to obtain the alpha-Fe2O3 / SnO2 nanoneedle composite gas-sensitive material. The preparation method is simple, the product is high in crystallinity and good in stability and is suitable for preparing a high-economical gas sensitive sensor material, and a sensor prepared from the alpha-Fe2O3 / SnO2 nanoneedle heterojunction gas sensitive material can effectively improve the gas sensitive performance of alpha-Fe2O3 and shows an extremely high response value to NO2 while the working temperature is reduced.

A method and application of CO2 laser-induced synthesis of jujube-shaped heterostructure electrocatalysts, after mixing a sulfur source and distilled water, adding a cobalt source, sodium citrate and a tin source, stirring evenly, the sulfur source is L-cysteine, ammonium thiocyanate, thiourea or sulfur powder, the cobalt source is hexahydrated cobalt nitrate, cobalt chloride and cobalt acetylacetonate, the tin source is stannous chloride, tin tetrachloride or stannous sulfate, hydrothermally reacting in a stainless steel autoclave, washing, centrifuging, vacuum drying at room temperature, obtaining an electrocatalyst precursor; grinding the electrocatalyst precursor into powder, evenly paving, and inducing CO2 laser in an air atmosphere; cooling to room temperature, washing, drying and grinding into powder to obtain a jujube-shaped heterostructure CoS / SnO2@C electrocatalyst. Advantages: simple synthesis, short time consumption, low energy consumption, good dispersibility, excellent ORR and OER electrocatalytic performance, can be used to prepare cathode electrocatalysts for lithium oxygen batteries.

The invention provides a preparation method of an antistatic metallocene catalyst. The method comprises the following steps: carrying out thermal activation treatment on a silica gel carrier; loading alkyl tin chloride on the silica gel carrier to obtain an alkyl tin chloride modified silica gel carrier; adding methylaluminoxane into the alkyl tin chloride modified silica gel carrier to obtain a methylaluminoxane / alkyl tin chloride modified silica gel carrier; adding a metallocene compound into the methylaluminoxane / alkyl tin chloride modified silica gel carrier for heating reaction, and then adding an antistatic agent to obtain the antistatic metallocene catalyst. Alkyl tin chloride is used for modifying a silica gel carrier and reacts with hydroxyl to greatly eliminate the hydroxyl; the loading capacity can be improved by combining with MAO, and metallocene combination sites can be increased; after the antistatic agent is added, static electricity generated in the reaction process is reduced, the flaking phenomenon is reduced, and the static electricity range can be controlled to be + / -0.02 KV.

Based on the characteristic that tin tetrachloride is easy to hydrolyze, efficient extraction of tin in the tellurium-deposited liquid is achieved through a two-step method of neutralization impurity removal and hydrolysis tin deposition, the pH value is adjusted firstly, stirring impurity removal is conducted, then heating hydrolysis tin deposition is conducted, the direct recovery rate of tin is 95% or above, the tin content of a product is also as high as 40% or above, and the method is suitable for industrial production. The lead content is lower than 0.5%, the chlorine content is lower than 2%, compared with an existing conventional neutralization precipitation method, the alkali liquor used in the method is little, and the impurity rate in the obtained tin material is low.

The application discloses a kind of photocatalyst and preparation method thereof, the photocatalyst is flower ball layer structure, composition includes SnS2, SnS, the molar ratio of SnS2 With SnS is 1-2.5:1.The preparation method of the photocatalyst, including the following steps: (1) tin tetrachloride pentahydrate, sulfur source is placed in first liquid, carries out first hydrothermal reaction, obtains SnS2;(2) to SnS2 Adding stannous chloride dihydrate and sulfur source, carries out second hydrothermal reaction, washes, obtains SnS2@SnS photocatalyst and dries.This application provides photocatalyst, can achieve the effect of excellent reduction performance.

The invention provides an antistatic metallocene catalyst and application thereof. The antistatic metallocene catalyst comprises an antistatic agent / methylaluminoxane / alkyl tin chloride / silica gel carrier and a metallocene compound loaded on the carrier; the antistatic agent / methylaluminoxane / alkyl tin chloride / silica gel carrier is a silica gel carrier modified by an antistatic agent, methylaluminoxane and alkyl tin chloride. Alkyl tin chloride is used for modifying a silica gel carrier and reacts with hydroxyl to greatly eliminate the hydroxyl; the loading capacity can be improved by combining with MAO, and metallocene combination sites can be increased; after the antistatic agent is added, static electricity generated in the reaction process is reduced, the flaking phenomenon is reduced, and the static electricity range can be controlled to be + / -0.02 KV.

The invention discloses an unsymmetrical dimethylhydrazine sensor based on an Ag-doped amorphous zinc stannate (ZnSnO3) sensitive material and a preparation method of the unsymmetrical dimethylhydrazine sensor, and belongs to the technical field of semiconductor metal oxide gas sensors. The preparation method comprises the following steps: firstly, taking tin tetrachloride pentahydrate and zinc chloride as metal precursors, taking citric acid hydrate as a metal complexing agent, preparing a zinc hydroxystannate ZnSn (OH) 6 nano cubic material with a hollow structure through a coprecipitation method and alkali etching, taking the zinc hydroxystannate ZnSn (OH) 6 nano cubic material as a precursor, preparing ZnSnO3 with an amorphous structure after high-temperature calcination, and obtaining an Ag-doped amorphous zinc stannate sensitive material through Ag doping; the material has the characteristics of high response, quick response recovery and low detection lower limit on low-concentration UDMH gas under the working condition of 175 DEG C. The sensor adopting the ceramic tube type structure is simple in manufacturing process, small in size and beneficial to industrial batch production, has important application value and has wide application prospects in the aspect of UDMH detection in a specific environment.

This invention relates to the field of pigment preparation, specifically to a method for preparing highly conductive titanium dioxide using the chloride process. The method includes: reacting oxygen and titanium tetrachloride with an oxidation reaction to generate titanium dioxide particles, which are then introduced into a cooling conduit. A preheated coating agent is added for a coating reaction and slurry preparation. The slurry temperature is adjusted to 60-75°C and the pH to 2-3, and a phosphate-containing compound is added. The slurry temperature is adjusted to 80-90°C, and a sodium aluminate solution and an alkaline solution are added to adjust the pH of the slurry to 9.5-10.5, followed by a first homogenization treatment. A tin chloride solution and a sodium aluminate solution are added, and the pH of the slurry is adjusted to 7.5-8.5, followed by a second homogenization treatment. The pH of the slurry is adjusted to 4.5-5.5, followed by a third homogenization treatment. The pH of the slurry is adjusted to 5.5-6.5, followed by a fourth homogenization treatment. This method is low-cost, simple, and suitable for large-scale production, producing conductive titanium dioxide with excellent performance.

A simple and efficient method for preparing high-purity rubidium chloride includes the following steps: Adding crude rubidium salt to glacial acetic acid, heating and stirring to dissolve, filtering to remove insoluble impurities, yielding a crude rubidium salt solution in glacial acetic acid; adding a certain amount of antimony trichloride solution to the crude rubidium salt solution in glacial acetic acid, stirring the reaction to obtain a small amount of pale yellow precipitate and solution until the reaction reaches equilibrium, yielding a clear liquid and precipitate, the precipitate being used to prepare high-purity cesium salt; secondary precipitation: adding a certain amount of tin tetrachloride solution in glacial acetic acid to the clear liquid, stirring the reaction to obtain a white precipitate and solution; standing, filtering, and washing: cooling and standing the solution until the reaction reaches equilibrium, filtering, washing the precipitate with glacial acetic acid, yielding a precipitate and washing liquid; double salt decomposition: adding high-purity water to the precipitate to form a slurry, then adding ammonia to adjust the pH value, filtering to obtain tin hydroxide precipitate and rubidium chloride solution; sending the filtrate for testing: evaporating the qualified rubidium chloride solution to dryness, calcining to obtain rubidium chloride; recrystallization: obtaining the high-purity rubidium chloride product. It has the advantages of effectively removing cesium ions from crude rubidium salt and avoiding the influence of alkali metal ions on the purity of the final product, without loss, and with high product purity.

The invention relates to a P-WO3 / SnO2 composite material derived based on phosphotungstic acid as well as a preparation method and application of the P-WO3 / SnO2 composite material. According to the material, a precursor solution containing tin chloride and phosphotungstic acid (HPW) is subjected to electrostatic spinning, and the fiber material with a hollow pipeline structure is prepared by means of a high-temperature calcination process. In the preparation process, a tungstate radical component in phosphotungstic acid is converted into tungsten trioxide (WO3), and the tungsten trioxide (WO3) and stannic oxide (SnO2) form a heterojunction interface. Meanwhile, phosphorus atoms are doped into material crystal lattices, a local electron regulation and control effect is generated, and the electron transfer capacity is enhanced. By adopting a synergistic effect of constructing a heterojunction interface and doping phosphorus element, an electric field built in the interface is effectively enhanced, and oxygen vacancies and an electronic structure of the material are regulated and controlled, so that the gas-sensitive response performance to triethylamine (TEA) gas is remarkably improved. The invention provides a new technical approach for constructing the heterojunction by using the complex oxysalt and cooperatively improving the gas sensing performance in combination with element doping.

The present invention discloses a hydrogen MEMS sensor for power battery detection and a preparation method thereof. The preparation method comprises: mixing tin tetrachloride, a doped metal salt containing palladium chloride, and deionized water, adding a curing agent and a dispersant, stirring, heating and standing to obtain a gas-sensitive material slurry; protecting the electrode on the silicon wafer with a photoresist, and coating the slurry on the surface of the silicon wafer with a slit coater to obtain a film-coated silicon wafer; during coating, the vacuum degree of the slit coater is ≤1.33×10 ‑2 Pa, the nozzle moving speed is 60-70 mm / min, and the size of each nozzle nozzle is 5 μm×1 μm to 5 μm×2 μm; the film thickness of the gas-sensitive material obtained after coating is 1-3 μm; the coated silicon wafer is annealed, cooled to room temperature, the photoresist protecting the electrode is removed, and the cutting, welding and packaging are performed. The sensor prepared in the present invention has high sensitivity and short response time for detecting hydrogen, and can meet the detection of hydrogen in power battery detection.

The invention discloses a catalyst for synthesizing p-cumylphenol and a preparation method thereof. The catalyst comprises an active component A, a carrier B and a cocatalyst C. The active component A is one or more of aluminum trichloride, tin tetrachloride, zinc chloride, ferric chloride and boron trichloride. The carrier B is one or more of silica gel and aluminum oxide; the cocatalyst C is one or more of zinc oxide, copper oxide, magnesium oxide, zirconium dioxide, titanium dioxide and boric oxide, the selectivity of the catalyst is high, and p-cumylphenol can be efficiently prepared.

The application discloses a method for recovering tin from tellurium precipitation post-liquid, based on the characteristics of tin tetrachloride being easy to hydrolyze, a two-step method of 'neutralization and impurity removal-hydrolysis and tin precipitation' is adopted to realize efficient extraction of tin in the tellurium precipitation post-liquid, first, the pH value is adjusted for stirring and impurity removal, then heating hydrolysis and tin precipitation are carried out, the direct recovery rate of tin is above 95%, the tin content of the product is also as high as above 40%, the lead content is below 0.5%, and the chlorine content is below 2%, compared with the existing conventional neutralization and precipitation method, the alkali liquor used by the application is less, and the impurity rate in the tin material obtained is lower.

The invention discloses a method for separating and recycling valuable metals in a retired photovoltaic module solder strip, which comprises the following steps: firstly, carrying out mechanical disassembly and thermal decomposition on a retired photovoltaic module, separating the solder strip and removing organic matters; then, a chlorinating agent is added, the temperature is controlled to range from 300 DEG C to 500 DEG C under the low-oxygen condition for a chlorination reaction, and the tin-lead alloy on the surface of the welding strip is converted into metal chloride and volatile gas with the low volatilization temperature. And through staged heating, tin chloride and lead chloride are collected at 600-700 DEG C and 800-900 DEG C respectively in sequence, residual solid copper is separated through a physical method, and metal copper is obtained. And the collected tin chloride and lead chloride are subjected to reduction or distillation treatment, and metal tin and lead are recovered. Through the temperature control volatilization and selective condensation technology, low-temperature efficient separation and recovery of valuable metal in the solder strip are achieved, the method has the advantages of being easy to operate, low in energy consumption and good in environmental protection property, and a new solution is provided for high-value utilization of waste resources in the photovoltaic industry.

The invention relates to the field of heat-insulating glass preparation, in particular to a heat-insulating glass preparation method based on E-51 / ATO, which comprises the following steps: 1, pouring tin tetrachloride pentahydrate and antimony trichloride as precursors into a stainless steel high-pressure kettle with a para-polyphenol lining, and sealing to obtain an ATO dispersion solution; 2, the ATO dispersion solution is centrifuged and washed with ethyl alcohol and deionized water respectively, and dried nanometer ATO powder is obtained; 3, weighing E-51, an amine curing agent and acetone, uniformly mixing, pouring the nano ATO powder, and continuously stirring to obtain uniform ATO / E-51 slurry; and 4, fixing the pretreated glass substrate on a platform, injecting the ATO / E-51 slurry into a spray pen material cup, spraying the ATO / E-51 slurry on the surface of the glass substrate, and drying and curing a sprayed sample to obtain the ATO / E-51 heat-insulating glass with a compact surface structure. ATO nano-particles with the particle size of 10 nm are directly prepared through an optimized solvothermal method, and then agglomeration of the nano-particles is effectively prevented through an accurate mass ratio and high-speed stirring synergistic dispersion process.

The invention discloses a synthesis process of high-purity tetramethyltin, and belongs to the field of synthesis of organic metal compounds. According to the process, metal tin powder and tin tetrachloride are used as raw materials, three-dimensional network SiO2 loaded nano ZnO is used as a carrier, the tin powder is uniformly loaded on the carrier through ethanol dispersion-vacuum drying, then the tin powder reacts with methyl magnesium bromide and chloromethane, and a product is obtained through combined purification of two-stage rectification and adsorption. The three-dimensional network SiO2 can uniformly disperse tin powder and accelerate mass transfer, the nano ZnO serves as a Lewis acid site to be coordinated with tin tetrachloride, activation energy is reduced, and the reaction efficiency and selectivity are improved through cooperation of the nano ZnO and the tin tetrachloride. According to the process, the conversion rate reaches 90% or above, the product purity is over 97%, the problems of tin powder agglomeration, many side reactions and low purity in a traditional process are solved, and the process is suitable for preparing the semiconductor material precursor.

A method for producing an electrothermal film, its precursor solution, and related heating devices. The solution consists of tin tetrachloride (SnCl₄), titanium tetrachloride (TiCl₄), zinc oxide (ZnO)

The invention discloses a tin-loaded ruthenium-based modified electrode as well as a preparation method and application thereof, and belongs to the technical field of electro-catalytic materials. According to the method, a titanium substrate is etched, then acetone is introduced for high-temperature carbonization, a titanium carbide nanotube array is grown in situ to serve as a three-dimensional conductive framework, the array serves as the substrate, ruthenium-tin hydroxide is co-deposited in a mixed plating solution containing ruthenium chloride and tin tetrachloride by adopting an adhesive-free electrodeposition process, and the three-dimensional conductive framework is obtained. And calcining to obtain the tin-loaded ruthenium-based modified electrode. Through the synergistic effect of tin and ruthenium and the unique three-dimensional array structure, the chlorine evolution activity and selectivity of the electrode are remarkably improved, and the oxygen evolution side reaction is effectively inhibited. When the electrode is used as a working electrode for preparing sodium hypochlorite by electrolyzing a sodium chloride solution, the electrode shows high current density, low impedance and chlorine evolution efficiency as high as 98.9%, and has the advantages of low cost, high efficiency and good stability.

The invention discloses a multi-metal multi-path recovery process, and belongs to the technical field of metal recovery. The method is used for solving the technical problem that in the prior art, the recovery rate and recovery purity of tin and antimony need to be further improved, and comprises the following steps that a tin-containing material and an antimony-containing material are pretreated and then mixed and smelted with a reducing agent, the obtained tin-antimony alloy is added into a hydrochloric acid solution, and a tin chloride solution and antimony oxychloride are obtained; then adding an adsorbent into the tin chloride solution for adsorption and desorption to obtain tin hydroxide, and dissolving antimony oxychloride and then replacing with iron powder to obtain the antimony simple substance. According to the method, the tin-antimony powder is firstly reduced by using the reducing agent and then is purified and recovered, so that the recovery rate and the purity of the recovered tin hydroxide and antimony are further improved.

The present invention relates to the field of gas sensing technology, and discloses a gas sensor modified with Ni-doped SnO 2 and CuO. Using sucrose, nickel chloride, and tin tetrachloride as raw materials, through hydrothermal treatment and calcination, nickel-doped tin oxide is obtained. Using it as the substrate and copper nitrate as the copper source, nickel-doped tin oxide hollow spheres modified with copper oxide nanoflowers are obtained, which have a super high specific surface area, facilitating more sufficient contact with gases such as CO, thereby improving the sensitivity of the sensor. Ni 2+ -doped tin oxide generates oxygen defects, forming more gas adsorption active sites, while reducing the resistance value and improving the gas sensing performance of the sensor. Copper oxide and tin oxide form a p-n heterojunction structure, increasing the grain boundary barrier and promoting the transfer of electrons between adsorbed oxygen and oxide grains, thereby improving the conductivity and accelerating the occurrence of the gas sensing reaction, thus reducing the response and recovery time of the sensor and enabling the sensor to have excellent CO gas sensing performance.

The present application belongs to the technical field of catalysts, and provides a high-catalytic-activity mercury-free catalyst for synthesizing vinyl chloride, a preparation method and application thereof.The high-catalytic-activity mercury-free catalyst for synthesizing vinyl chloride comprises the following components in percentage by mass: 0.03-0.08% of platinum salt, 5-10% of cuprous chloride, 2-5% of bismuth chloride, 3-6% of tin tetrachloride, 1-4% of potassium chloride, and the balance of a porous carrier.The porous carrier in the present application is used for loading active components, and the amount of noble metal platinum is reduced by simultaneously adding cuprous chloride, bismuth chloride, tin tetrachloride and potassium chloride as an additive, while the activity and stability of the mercury-free catalyst are improved.The results of the examples show that the yield of vinyl chloride is 97.9% when the mercury-free catalyst provided by the present application is used for synthesizing vinyl chloride; and the yield of vinyl chloride is 97.2% after 30000h of continuous use.

The invention discloses SnS2 / ZnO nanoflowers as well as a preparation method and application thereof, and belongs to the technical field of gas sensing materials. According to the technical scheme, the preparation method comprises the following steps: 1) respectively dissolving tin chloride and thiourea into polyethylene glycol and deionized water, stirring, transferring the solution into a reaction kettle, carrying out hydrothermal reaction, cooling, washing and drying to obtain SnS2 nanoflowers; and 2) placing the SnS2 nanoflower in an ALD reaction chamber, and depositing ZnO on the SnS2 nanoflower by multiple ALD cycles to obtain the ZnO-loaded SnS2 nanoflower. According to the preparation method, the SnS2 / ZnO nanoflower is prepared by using an atomic layer deposition (ALD) technology, and the SnS2 / ZnO heterojunction is constructed, the method is based on an ALD surface self-limiting reaction, uniform nano materials are allowed to be deposited on a large area, and high-response sensors are allowed to be produced on a large scale.

The application discloses a production method of preparing tetrabutyl tin with single solvent, and particularly relates to the technical field of organic compound synthesis. The application solves the technical problems of large solvent loss, high energy consumption of separation, complex water removal process and low product yield in the traditional THF and toluene mixed solvent process. In the application, isopropyl ether is used as single solvent, magnesium and chlorobutane are used to generate butylmagnesium chloride in the isopropyl ether; then, tin tetrachloride is dropped into the mixture, and tetrabutyl tin and anhydrous magnesium chloride are generated by continuous stirring reaction; hydrochloric acid is added to the system to dissolve the solid precipitate, and the upper organic phase is obtained by standing and separating; finally, the isopropyl ether is recovered by normal pressure distillation, and the tetrabutyl tin is obtained by reduced pressure distillation. The application realizes efficient recovery and recycling of the solvent by using the low boiling point and water insolubility of the isopropyl ether; and the molecular sieve drying step is omitted by using the in-situ water absorption property of the by-product anhydrous magnesium chloride.

The present invention belongs to the technical field of organic metals, and specifically relates to a method for preparing dioctyltin oxide, a catalyst for ultrafine electrophoretic coatings. The present invention uses tetraoctyltin, tin tetrachloride, toluene and a catalyst as main raw materials, does not use traditional surfactants, forms ultrafine powders from the formed materials through a special pressurized spray device, reduces product impurity wrapping, and increases reaction efficiency. The product is washed multiple times with ultra-low conductivity pure water to obtain ultrafine, low-chlorine, low-conductivity dioctyltin oxide, which is catalyst-grade and specially used for cathode electrophoretic coatings. In addition, WO3 / MgO is used as a catalyst in the preparation process. In the process of converting dioctyltin chloride into dioctyltin oxide, WO3 / MgO promotes the removal of chlorine atoms and the formation of tin oxide, and the addition of WO3 / MgO helps to improve the stability and dispersibility of dioctyltin oxide, and prevents it from aggregating or precipitating during the reaction.

The application discloses a process for preparing molybdenum trichloride, comprising the following processes: ①excess molybdenum pentachloride and stannous chloride powder are mixed, and the mixture is heated in a reactor to generate a replacement reaction to form molybdenum trichloride and tin tetrachloride; ②the generated tin tetrachloride is vaporized out of the reactor and enters a cooling system to collect and cool to obtain tin tetrachloride liquid; ③after the reaction is completed, the cooling system is switched into a molybdenum pentachloride collector, the reactor is heated to a certain temperature, and the excess molybdenum pentachloride is vaporized into the molybdenum pentachloride collector; ④after the reactor is cooled, the molybdenum trichloride product is obtained; and ⑤the tin tetrachloride liquid is filtered in a closed manner to obtain tin tetrachloride product and molybdenum pentachloride filter residue, and the molybdenum pentachloride filter residue and the collected molybdenum pentachloride can be recycled as reaction raw materials. The application improves the yield of molybdenum trichloride, reduces the production cost, the purity of the by-product tin tetrachloride is more than 99%, the waste gas amount in the production process is greatly reduced, and the process belongs to a green and environment-friendly process.

The invention provides a method for directly preparing stannous oxalate from tin-containing waste materials. The method comprises the following steps: (1) adding hydrochloric acid into water to prepare a solution A; (2) adding tin tetrachloride into the solution A for dissolving to prepare a selective tin dissolving solution B; (3) adding the tin-containing waste material into the solution B, and dissolving tin to obtain a solution C; (4) adjusting the pH value of the solution C, and then adding oxalic acid to generate stannous oxalate precipitate; and (5) standing, filtering, chlorinating the filtrate, returning to the solution B prepared in the step (2), and washing, filtering and drying the filter residue to obtain the stannous oxalate product. The tin dissolving process is a disproportionation reaction and has the advantages of being good in selectivity, high in reaction speed and good in product quality. Besides, compared with an existing method for preparing stannous oxalate with reagents such as metal tin and tin compounds which are high in price as raw materials, the method has the advantages that the raw materials are tin-containing waste materials, and the method is wide in source, low in cost and good in benefit.

The application discloses a pre-treatment fluid suitable for wellbore integrity casing cement sheath repair. The pre-treatment fluid is prepared by emulsification of bisphenol A type epoxy resin, catalyst A, catalyst B, solvent, alkoxylation reagent and pH regulator; the catalyst A is one or more of tetrabutylammonium chloride, triethanolamine, sodium hydroxide, magnesium hydroxide and boron trifluoride ether; and the catalyst B is one or more of sodium acetate, ammonium chloride, boron trifluoride and tin tetrachloride. The application can perform cyclic treatment on the broken point before pumping the repair material, and improve the wettability of the surface of the broken point, thereby promoting the repair effect.

The invention belongs to the technical field of fuel oil catalytic oxidation desulfurization, and discloses a tin-based eutectic solvent, a preparation method thereof and application of the tin-based eutectic solvent in fuel oil desulfurization. According to the invention, stannic chloride pentahydrate (SnCl4. 5H2O) and an acid hydrogen bond donor are used as raw materials and are mixed under a certain condition to obtain the stannic chloride-hydrogen bond composite material; the oxidation desulfurization comprises the following steps: adding the tin-based eutectic solvent into an oil product containing dibenzothiophene, and adding hydrogen peroxide as an oxidant to carry out an oxidation desulfurization reaction. According to the method, raw materials used for synthesizing the eutectic solvent are cheap and easy to obtain, the eutectic solvent can be prepared through one-step stirring, the prepared eutectic solvent is more environmentally friendly, the sulfur removal rate reaches 99.9%, the desulfurization effect is good, and the eutectic solvent can be recycled.