361 results about "Strong acids" patented technology

The invention relates to an acylhydrazone bond-connected covalent organic framework material, in particular to an acylhydrazone bond-connected covalent organic framework material as well as a preparation method and application thereof, and aims to overcome the defects of various materials for adsorbing Pd (II) in one aspect or the defects of poor stability and durability in high-acidity and high-radioactivity environments. Or the adsorption selectivity on Pd (II) is not strong. As an emerging crystalline organic porous polymer, the covalent organic framework is mainly formed by connecting pure organic structural units through dynamic covalent bonds, has the advantages of permanent high porosity, low density, high chemical stability, high thermal stability and the like, and is expected to realize Pd (II) adsorption in strong acid and ray irradiation environments.

The invention relates to a method for constructing a composite super-hydrophobic coating through double bonding. The preparation method comprises the following steps: taking a clean copper sheet which is not pretreated as a substrate, dipping the copper sheet in a suspension consisting of nanoparticles and sulfydryl-containing siloxane ethanol, taking out, washing, drying, dipping in a perfluoromercaptan ethanol solution, taking out, washing, and drying to obtain the copper-based super-hydrophobic surface coating. The coating prepared by the method has excellent super-hydrophobicity, icing resistance and stability. Different from an existing conventional preparation method, the method has the advantages that pretreatment operation such as abrasive paper polishing, strong acid etching or anodic oxidation does not need to be carried out on a copper sheet, and micro-nano roughening and low-surface-energy self-assembly can be completed on the copper surface only through two-step normal-temperature dipping. The method is simple in preparation process, mild in condition, free of expensive equipment, thin in coating thickness and small in influence on electric conduction and heat conduction of the copper substrate, intrinsic performance of copper can be reserved, the electric conduction / heat conduction characteristic of the copper substrate is considered, and the method has wide application value and prospects.

The invention discloses an internal-acid and external-alkali type organic-inorganic hybrid molecular sieve catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalytic materials and chemical processes. According to the catalyst, a hydrogen type Beta molecular sieve is used as an acidic inner core, polyvinylpyrrolidone (PVP) is used as an organic shell, and a unique inner-acid outer-alkali structure is formed. The preparation method comprises the following steps: hydrothermally synthesizing a hydrogen type Beta molecular sieve with a specific silica-alumina ratio, and then coating PVP through surface adsorption. The catalyst is used for catalyzing the condensation of methylal and trioxymethylene under mild conditions (40-70 DEG C and normal pressure) to prepare polyoxymethylene dimethyl ethers (DMMn). The PVP shell covers acidic sites on the outer surface of the molecular sieve to form an external neutral / weak base and internal strong acid microenvironment, so that the secondary side reaction of the product is effectively inhibited, the trioxymethylene conversion rate of more than 98% and the DMMn selectivity of more than 96% can be obtained in the reaction at 50 DEG C and normal pressure, the product distribution can be regulated and controlled, and the traditional Anderson-Schulz-Flory distribution limitation is broken through. The catalyst disclosed by the invention has the advantages of high activity, high selectivity, mild conditions and easiness in separation, and has a good industrial application prospect.

A treatment composition that includes a treatment adjunct and a population of core / shell delivery particles, where the shell is made from an acid-treated chitosan and a cross-linking agent, where the acid-treated chitosan results from treating chitosan with a weak acid, or even a mixture of a strong acid and a weak acid. Related methods of making and using such compositions.

The synthesis method comprises the following steps: S1, adding furandicarboxylic acid into a reaction container, adding a certain amount of methanol, adding a double-acid-site strong acid solid catalyst, starting stirring, controlling the reaction temperature to carry out esterification reaction, and after the reaction is finished, filtering, washing and drying to obtain furandihydrazide; separating out the double-acid-site strong acid solid catalyst to obtain clear liquid, namely dimethyl furandicarboxylate; s2, transferring dimethyl furandicarboxylate serving as a raw material into another reaction container, adding a certain amount of sodium formate serving as a catalyst, then adding a proper amount of hydrazine hydrate, controlling the reaction temperature, keeping a reflux state, reacting for a period of time, cooling to room temperature after the reaction is finished, and performing centrifugal separation to obtain white solid furandihydrazide. The synthesis method has the advantages of simple reaction steps, no need of toxic and harmful catalysts, mild reaction conditions, high conversion rate and high yield, and can realize efficient, green and low-cost production of furandihydrazide.

The invention discloses a compound environment-friendly corrosion inhibitor as well as a preparation method and application thereof. The choline ionic liquid comprises choline ionic liquid and amino acid, the choline ionic liquid is choline cations; the amino acid is one or more of cysteine and tryptophan. The compound environment-friendly corrosion inhibitor has high corrosion inhibition efficiency, and the compound structure of the compound environment-friendly corrosion inhibitor further improves the protection performance of the compound environment-friendly corrosion inhibitor through a dual adsorption mechanism of the synergistic effect of physical adsorption and chemical adsorption on the metal surface. According to the compound environment-friendly corrosion inhibitor, a full-green ionic liquid corrosion inhibition system is constructed, the environment-friendly requirement is met, and a metal protection solution can be provided for industrial acid pickling and other strong acid working conditions. Not only is the progress of a corrosion inhibition technology promoted, but also more economic and environment-friendly anti-corrosion application can be provided for actual industrial scenes.

The invention discloses a strong acid and alkali resistant plastic material for fume hood surface decoration and a preparation method of the strong acid and alkali resistant plastic material, belongs to the technical field of plastic material processing, and aims at solving the technical problem that in the prior art, the acid and alkali resistance and the bending modulus of a plastic material for fume hood surface decoration need to be further improved. The preparation method specifically comprises the following steps: stirring amino-modified fluorosilicone resin, paraformaldehyde and 1, 4-dioxane in a reaction kettle, dropwise adding an anacardol solution, heating the reaction kettle to 85-95 DEG C, carrying out heat preservation reaction for 6-8 hours, and carrying out post-treatment to obtain the anacardol-based benzoxazine resin. Perfluoro-modified polysiloxane benzoxazine is prepared, naphthalene-containing epoxy resin and imidazole-modified silicon carbide microspheres are compounded, in-situ catalysis synergistic curing is carried out by using filler interface imidazole, a compact organic-inorganic hybrid interpenetrating network is constructed, and the strong acid and alkali corrosion resistance and bending modulus of the material are remarkably improved.

The invention discloses application of a carbon steel corrosion inhibitor based on combination of physical adsorption, chemical adsorption and hydrophobic barrier, and relates to the technical field of metal corrosion inhibition. The technical problem that a corrosion inhibitor in the prior art is low in corrosion inhibition efficiency in a high-temperature strong-acid environment is solved. The preparation method of the carbon steel corrosion inhibitor comprises the following steps: firstly, ultrasonically dissolving 4-aminopyridine to obtain a solution I; then, dropwise adding an isopropanol solution of 2, 3-epoxypropyltrimethylammonium chloride into the solution I according to a molar ratio of 1: 1, removing a solvent through a rotary evaporation method, washing with ethanol, centrifuging to obtain quaternized 4-aminopyridine, and drying the quaternized 4-aminopyridine; and finally, the dried quaternized 4-aminopyridine and bromododecane are added into acetonitrile for a reaction, diethyl ether is dropwise added into obtained reaction liquid for precipitation, and the quaternized 4-aminopyridine-bromododecane carbon steel corrosion inhibitor is obtained after drying. The prepared carbon steel corrosion inhibitor is high in corrosion inhibition efficiency in a high-temperature and strong-acid environment.

The application relates to an application of a zirconium hydrogen phosphate (ZrHP) catalyst in carbon dioxide (CO2) desorption. Specifically comprising the following steps: mixing the zirconium hydrogen phosphate catalyst with a CO2-rich amine solution, and carrying out catalytic desorption under heating conditions to realize efficient regeneration of the amine solution. The zirconium hydrogen phosphate catalyst can significantly improve the desorption rate of CO2 and effectively reduce the energy consumption of the desorption process due to its rich acid sites and strong acid characteristics. The application provides an efficient and energy-saving solution for the field of CO2 capture and desorption, and has good industrial application potential.

The invention relates to a composite catalyst as well as a preparation method and application thereof, and mainly solves the problems of high temperature, more byproducts, catalyst residues, equipment corrosion, low catalytic efficiency of a novel catalyst and the like when a traditional strong acid catalyst system is used in the prior art. The research method comprises the following steps: preparing a sulfonic acid alkyl imidazole compound catalyst by a two-step method; 1 wt% of the catalyst is used for carrying out esterification reaction on polyhydric alcohol and fatty acid; after the reaction is finished, a product is separated from the catalyst, and the ionic liquid is recycled; and carrying out weak base washing, filtering and water washing refining on the product. The catalytic efficiency of the catalyst reaches up to 99.5% or above, the product hydroxyl value is smaller than 5 mgKOH / g, the acid value is smaller than 0.5 mgKOH / g, and the esterification efficiency is still kept to be 99.0% or above after the catalyst is recycled 6 times. The method has the advantages of simple process, mild reaction conditions and recyclable catalyst, well solves the problems of high temperature, catalyst residue, many byproducts and equipment corrosion in the traditional catalytic esterification system, and can be used in the preparation process of various ester products.

The application discloses a method and device for producing bright stock, and the obtained bright stock, which comprises the following steps: (1) contacting heavy oil with a hydrogenation catalyst under the presence of hydrogen, and performing hydrogenation reaction under hydrogenation treatment conditions to obtain a hydrogenation product; (2) performing alkylation reaction of aromatics in the hydrogenation product and C10-C20 olefins in olefin oil under the presence of a strong acid catalyst and under alkylation reaction conditions to obtain an alkylation product; and (3) performing distillation separation on the alkylation product to separate and obtain a heavy fraction with a temperature greater than 500 DEG C as the bright stock product. The method provided by the application expands the raw material source of the bright stock, simplifies the process flow, and is convenient for industrial production; and the prepared bright stock product not only has high viscosity and viscosity index, but also has good low-temperature flow performance and high oxidation stability.

The application provides a catalyst and a preparation method and application thereof, and the catalyst comprises a carrier and an active metal component loaded thereon; the carrier comprises ZSM-5 zeolite and a binder, and the molar ratio of SiO2 / Al2O3 in the ZSM-5 zeolite is 15-50; the amount of strong acid centers on the outer surface of the catalyst is less than or equal to 10 mu mol / g; and the ratio of the saturated adsorption amount of p-xylene to the saturated adsorption amount of o-xylene of the catalyst is 3-20 under the condition of 400 DEG C. The catalyst provided by the application can catalyze the generation of benzene from toluene dealkylation under a medium-temperature condition, and the selectivity of benzene is good and the yield is high.

The invention discloses a hydrochloric acid purification and rectification method, which belongs to the technical field of compound purification, and comprises the following steps: sequentially carrying out high-order temporary storage, normal-pressure rectification, condensation collection, quality detection and filtration treatment on industrial-grade hydrochloric acid to realize graded removal of volatile impurities and non-volatile impurities in hydrochloric acid; wherein in the filtering step, a filtering device formed by compounding two layers of long-acting microporous membranes is adopted, and the microporous membranes are polytetrafluoroethylene long-acting microporous membranes prepared by adopting a specific lubricant system and have stable microporous structures and excellent strong acid resistance. Meanwhile, hydrochloric acid waste gas generated in the rectification and packaging process is subjected to water absorption treatment, and waste gas treatment and resource recycling are achieved. Compared with the prior art, the process flow is simple, the applicability is high, the filtering stability and the operation reliability are high, the hydrochloric acid purification quality can be effectively improved, the comprehensive operation risk of the system is reduced, and the method is suitable for industrial popularization and application.

This invention discloses a platinum-based catalyst for the hydrogenation reaction, its preparation method, and an electrode. The catalyst uses orthorhombic niobium pentoxide (T-Nb₂O₅) as a support to support the active component platinum. The support is resistant to strong acids and electrochemical corrosion at potentials above 1.0 V (vs RHE). The catalyst exhibits a hydrogenation reaction current density of not less than 200 mA·cm⁻¹ at 0.45 V (vs RHE). ‑2 In preparation, ammonium niobate oxalate hydrate was used as the niobium source, and the mixture was gelled via a sol-gel method. The gel was then heat-treated at 600-700℃ to obtain an orthorhombic niobium pentoxide support. The pH was adjusted to less than 3, and platinum was reduced with sodium borohydride to prepare the catalyst. This catalyst was then used to fabricate a hydrogen depolarization anolyte gas diffusion electrode with a platinum loading of 0.5-1.0 mg·cm³. ‑2 It can operate continuously and stably for no less than 120 hours with a cell voltage in the range of 1.25-1.45V. The catalyst of this invention has high activity and excellent stability, and can be used as a hydrogen depolarization anode in hydrometallurgy, significantly reducing electrolysis energy consumption and making it suitable for industrial applications.

The present application belongs to the technical field of waste oil recycling, and particularly relates to a method for recycling and processing by-products of edible vegetable oil processing, comprising the following steps: S1, mixing raw materials with deionized water and potassium permanganate, wherein the raw materials comprise soapstock, oil foot and deodorized distillate; S2, performing gradient separation treatment on the mixed liquid obtained in step S1, wherein the gradient separation treatment comprises centrifugal separation, mixed solvent extraction and ultrasonic-assisted separation; and S3, recycling oil and fat products and solid products obtained in step S2. The present application realizes the collaborative treatment of multiple types of by-products, the comprehensive recovery rate of oil and fat reaches more than 85%, the energy consumption is reduced by 35%, the use of strong acid and strong base is avoided, it is green and environmentally friendly, the operation is simple, and it is suitable for industrial application.

The invention discloses a hydrogen sulfide scavenger for acid fracturing and a preparation method thereof, and relates to the technical field of hydrogen sulfide scavengers, the hydrogen sulfide scavenger comprises the following raw materials by weight: 30-45 parts of an aldehyde compound, 30-45 parts of an alcohol amine compound, 10-18 parts of a diamine bridging agent, 2-6 parts of a solubilizing compounding agent, 20-30 parts of a solvent and 1-3 parts of a catalyst; the aldehyde compound is divided into a component A and a component B, the mass ratio of the component A to the component B is 2: 1-3: 1, the component A is paraformaldehyde, and the component B is at least one of glyoxal or glutaraldehyde. By optimizing a molecular skeleton and introducing a hydrophilic group, the sulfur removal capacity and chemical stability in a strong acid environment are improved, compatibility with acid liquor is good, generation of acid sludge and insoluble precipitates is effectively inhibited, secondary damage to a stratum is avoided, and the high efficiency and mass transfer performance of a product are guaranteed through the preparation process.

The embodiment of the application discloses a preparation method of a target temperature-sensitive drug-loaded composite microsphere based on attapulgite, which comprises the following steps: carrying out purification treatment on original attapulgite based on an aqueous solution of inorganic strong acid to obtain purified attapulgite; mixing the purified attapulgite, gypenoside, inulin and folic acid to obtain a mixture, and carrying out mixing treatment on the mixture based on deionized water to obtain a composite microsphere suspension; conveying the composite microsphere suspension into a spray dryer to carry out granulation to obtain primary drug-loaded composite microspheres; adopting a melt impregnation method to coat lauric acid on the surface and pores of the primary drug-loaded composite microspheres, and cooling the primary drug-loaded composite microspheres coated with lauric acid to room temperature to obtain the target temperature-sensitive drug-loaded composite microspheres. The application can not only realize temperature change-based on-off type control release of drugs, significantly improve the targeting and treatment accuracy of drugs, but also reduce the systemic toxic side effects of chemotherapy from the source, and realize efficient and low-toxicity synergistic treatment.

The invention discloses a method for catalytically reducing U (VI) under mild conditions, and belongs to the technical field of heavy metal pollution treatment and nuclear environment engineering. The spherical cobalt metal loaded nitrogen-doped carbon material (Co (at) MNCS) prepared by pyrolysis is used as a catalytic material, HCOOH is used as a reducing agent and an acidity regulator, strong acid does not need to be additionally added, and U (VI) can be efficiently reduced into U (IV) under the mild conditions of 25-60 DEG C and normal pressure by utilizing high catalytic activity and structural stability of the catalyst. Within the initial concentration range of 10-30 mg / L, the reduction efficiency exceeds 99%; almost complete reduction can be realized within 9 minutes at 25 DEG C; compared with a traditional hydrazine-containing and heavy metal-containing reducing agent or precious metal catalytic system, the method has the advantages that the environmental negative influence and the catalytic cost are remarkably reduced, the reduction efficiency of the catalyst still reaches 87% or above after 5 times of circulation, and the method conforms to the industrial development direction of nuclear fuel circulation greening and uranium-containing wastewater efficient treatment and has a wide practical application prospect.

The application belongs to the technical field of fine chemical industry, and discloses a method for synthesizing cyclopentanol, which comprises the following steps: (1) taking cyclopentene and water as raw materials, adding a solubilizer, and mixing to obtain a reaction liquid; (2) continuously hydrating the reaction liquid in a fixed bed reactor filled with a cation exchange resin to obtain a reaction product; and (3) distilling and separating the reaction product to obtain cyclopentanol. The synthesis method has the advantages of simple process flow, environmental protection, low energy consumption, excellent product indexes, and long operation cycle of the catalyst. Polyethylene glycol-400 or polypropylene glycol-400 is used as a single solubilizer, and a specific macroporous strong acid cation exchange resin catalyst is used to realize the efficient and high-selectivity hydration reaction of cyclopentene.

1. Name of the product in this design: Lid-covered beaker. 2. Purpose of this design: It is used to hold solutions or as a reactor, and can withstand strong acid and alkali liquids to prevent the loss of substances in the liquid during high-temperature and long-term processing. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model. 5. Other matters requiring explanation: The cup body of this design product is made of transparent material.

This invention discloses an environmentally friendly multifunctional stainless steel cleaning agent and its preparation method, belonging to the technical field of stainless steel surface cleaning materials. The method involves grinding diatomaceous earth into powder, drying it, calcining it, cooling it, and then sieving it to obtain diatomaceous earth powder. The diatomaceous earth powder, a portion of water, polyacrylic acid, polyvinyl alcohol, polydimethylsiloxane, and silica are mixed and then ball-milled to obtain a ball mill slurry. The ball mill slurry, fatty amine polyoxyethylene ether, lauric acid diethanolamide, and glycolic acid are added to a reaction vessel, heated and stirred, and then cooled to obtain mixture A. Carboxymethyl cellulose, sodium tripolyphosphate, calcium lignosulfonate, glycerol phospholipids, and the remaining water are added to mixture A, heated and stirred, and then cooled to obtain the environmentally friendly multifunctional stainless steel cleaning agent. This cleaning agent is water-based and does not contain strong acids, strong alkalis, or other chemicals, avoiding secondary corrosion of stainless steel. The preparation method is simple and suitable for mass production.

The utility model discloses a sewage filtering treatment device for industrial boiler desulfurization, which relates to the technical field of sewage treatment and comprises an acid-base balance mechanism, and a filtering mechanism is arranged on the right side of the acid-base balance mechanism. The acid-base balance mechanism comprises a primary balance assembly and a secondary detection assembly, and supporting assemblies are arranged at the bottoms of the primary balance assembly and the secondary detection assembly. After the sewage is treated by the acid-base balance mechanism, strong acid, high-concentration sulfides and heavy metal ions in the sewage are greatly reduced, activated carbon, ceramsite and other filtering agents in the filtering box only need to treat trace residual pollutants, the material chemical corrosion and mechanical wear rate is reduced, a second detection sensor in the detection tank performs secondary detection on the primarily treated sewage, and the detection efficiency is improved. If the sulfide residue exceeds the standard, the high-molecular sulfide capturing agent is supplemented through the second feeding pipe, so that the sulfide concentration is further reduced, the corrosion of the sewage entering the filtering mechanism is remarkably reduced, and the filtering agent is prevented from losing efficacy due to long-term contact with the high-concentration sulfide.

The application provides a method for removing anthraquinone substances in industrial hydrogen peroxide, wherein the main organic substance in industrial hydrogen peroxide is anthraquinone, anthraquinone is weakly alkaline in hydrogen peroxide, and can be regarded as a combination of anthraquinone cation and hydroxyl radical, and the anthraquinone cation can be adsorbed and removed by a cation exchange resin. According to the above principle, the anthraquinone substances in industrial hydrogen peroxide are removed by using two-stage cation exchange, sequentially passing through a first-stage and a second-stage anti-oxidation strong acid type cation exchange resin exchange column, and low organic carbon content industrial hydrogen peroxide is obtained. The first-stage cation exchange plays a main role in the removal of the anthraquinone substances, and the second-stage ensures the stability of the removal of the anthraquinone substances. Through comprehensive comparison, the comprehensive cost of the cation exchange resin used in the application is only less than one third of the current organic adsorption resin, and the removal effect is better, and the industrialization cost is very low.

The invention discloses a dechlorination method of a wet-process phosphoric acid process, and belongs to the technical field of dechlorination of wet-process phosphoric acid. The method comprises the following steps: adding ground phosphorite into a reaction tank A, carrying out decomposition reaction on the phosphorite and high-temperature slurry to obtain slurry a, pumping the slurry a into a reaction tank B, adding concentrated sulfuric acid and a sodium persulfate solution, activating sodium persulfate in the inherent high temperature, strong acid and Fe2 environment, carrying out oxidation dechlorination reaction, and carrying out solid-liquid separation to obtain low-chlorine phosphoric acid and phosphogypsum; finally, the reaction tank B is connected with a tail gas washing system, water is used for circulating washing, then alkali liquor is used for countercurrent washing, and the pollution discharge standard is met. The oxidation dechlorination process is integrated in the wet-process phosphoric acid production process for the first time, chloride ions are efficiently oxidized into chlorine to be removed by utilizing the strong oxidizing property of sodium persulfate, the dechlorination rate can reach 95% or above, the chlorine content in phosphoric acid is remarkably reduced, equipment corrosion is relieved, the product quality is improved, and the method is simple in process, low in energy consumption, low in cost, green, environmentally friendly and suitable for industrial production. The method is suitable for industrial application.

The invention discloses a method for preparing 2, 2-bis (2-tetrahydrofuryl) propane, and belongs to the technical field of organic synthesis. The method comprises the following steps: with furan and acetone as starting raw materials, firstly carrying out condensation reaction under the action of an organic strong acid catalyst to generate 2, 2-bis (2-furyl) propane, and then carrying out catalytic hydrogenation reduction to obtain a target product. The organic strong acid is selected from one or more of p-toluenesulfonic acid, trifluoromethanesulfonic acid, methanesulfonic acid, ethanesulfonic acid and benzenesulfonic acid. The organic strong acid is adopted to replace a traditional inorganic strong acid catalyst, the problems of equipment corrosion, post-treatment difficulty, low yield and the like are solved, the reaction condition is mild, the condensation reaction yield can reach 90% or above, the overall yield is high, the technological operation is simple, and the method is suitable for industrial production.

The utility model discloses a kind of automatic filling equipment of strong acid strong base material with anti-offset structure, including bottom plate and guide plate, the bottom plate top surface is equipped with multiple vertical rods, multiple the vertical rod top surface is equipped with top plate, the guide plate passes between both sides vertical rods, the top plate top surface middle part is connected with filling pipe and is penetrated, same side two the vertical rod side surface is fixedly installed with guide plate, the guide plate one side is provided with inclined plane, the top surface of one side the inclined plane is equipped with the blocking component for stopping jar, the guide plate surface is equipped with installation groove, the clamping assembly that passes inside of installation groove is installed in the guide plate one side. The utility model can drive jar to move to the position against filling pipe by guide plate, both sides guide plate, inclined plane guide jar, and jar is fixed by clamping assembly, prevent jar offset when material is filled.

The invention relates to the technical field of organic synthesis, in particular to a green synthesis method of a benzotriazole compound. A conventional o-phenylenediamine method for synthesizing benzotriazole compounds needs to accumulate under the action of sodium nitrite and acid to generate a large number of diazonium salt intermediates with high explosion risk, and the diazonium salt intermediates are separated and then subjected to cyclization reaction. In order to solve the problems, the invention provides the green synthesis method of the benzotriazole compound, o-phenylenediamine, a derivative of o-phenylenediamine and nitrate are used as initial raw materials, and the benzotriazole compound is generated by heating reaction in an organic solvent under the action of a reducing agent. And the stability and color of the product are effectively guaranteed. Meanwhile, a sodium nitrite system is avoided, the toxicity in the reaction process is reduced, the accumulation of diazonium salt is avoided, the explosion risk is reduced, and the reaction safety is improved.

The invention discloses a preparation method of ethylhexyl palmitate, and relates to the technical field of ethylhexyl palmitate. According to the method, firstly, isooctanol is gasified and then introduced into a methyl palmitate solution, ethylhexyl palmitate is prepared through transesterification, gaseous feeding can improve the instantaneous concentration of alcohol in a liquid phase, the reaction is promoted to be carried out in the positive direction, the reaction rate is increased, meanwhile, methanol generated through the transesterification method can be gasified and taken out of a system, and the yield of ethylhexyl palmitate is increased. Forward proceeding of the reaction is further promoted, so that the reaction is more thorough; secondly, chromium salt is used as a metal source precursor and a 2-sulfo-4, 4 '-biphenyldicarboxylic acid ligand to synthesize a catalyst, a biphenyl group in the ligand provides rigid and hydrophobic large pore channels and provides a local high-concentration reaction environment, gaseous isooctanol can be easily diffused into the pore channels of the catalyst and is in contact with enriched methyl palmitate, and the reaction efficiency is improved; and sulfonic acid groups uniformly distributed in the ligand serve as solid superacid, strong acid sites are provided, and the production efficiency is improved.

The application relates to the field of industrial cleaning and film stripping technology, in particular to a magnetic force polishing film stripping agent and a preparation method thereof, which is prepared from the following raw materials in percentage by weight: 10-20% of environment-friendly organic solvent, 1-10% of corrosion inhibitor, 5-15% of surfactant, 5-15% of lubricant, 1-10% of organic additive, 1-5% of chelating agent, and the rest of deionized water; the environment-friendly organic solvent is composed of D-limonene and gamma-valerolactone; by adopting the above formula, the organic film layers such as acrylate and epoxy resin can be quickly softened and peeled off at normal temperature to 50 DEG C, and high temperature or ultrasonic assistance is not needed, so that energy consumption is reduced. The system does not contain strong acid and strong base, the corrosion inhibitor can form effective protection on active metals such as aluminum, magnesium and zinc, and corrosion and surface damage are avoided; the surfactant and the lubricant can synergistically improve wetting and permeability and reduce mechanical scratches; the chelating agent can stabilize metal ions and prevent redeposition; the organic additive can optimize dissolution kinetics. The overall formula is low-toxic and low-volatility, and has high film stripping efficiency and substrate compatibility.

The invention discloses a preparation method of a molybdenum-niobium alloy metallographic sample, and relates to the technical field of preparation of samples for alloy testing, the preparation method comprises the steps of sampling, grinding, polishing and corrosion, in the corrosion step, a mixed solution of perchloric acid and ethanol is adopted as an electrolyte, the volume ratio of the perchloric acid to the ethanol is (1-2): (10-12), and the volume ratio of the perchloric acid to the ethanol is (1-2): (10-12). The anode material is a molybdenum-niobium alloy metallographic sample, the cathode material is an alloy material containing 16-18% of chromium, 10-14% of nickel and other components of iron, the voltage is 3-5 V, and the electrolysis time is 5-15 s. Compared with a traditional chemical corrosion or strong acid system electrolytic corrosion process, the method has the advantages that the grain boundary is clearly revealed, and the grain size evaluation is accurate and reliable; the multiphase structure contrast is enhanced, and the second phase recognition capability is remarkably improved; the plastic deformation and recrystallization structure resolution capability is high; the corrosion process is high in controllability and excellent in repeatability and stability; and scientific judgment on the real microstructure of the molybdenum-niobium alloy is remarkably improved.