387 results about "Ammonium hydroxide" patented technology

The invention provides a salt-responsive temperature-resistant salt-resistant water-based drilling fluid tackifying filtrate reducer as well as a preparation method and application thereof, and belongs to the technical field of drilling. The tackifying filtrate reducer is prepared from the following raw materials in parts by mass: 30 to 50 parts of 1-(2-carboxyethyl)-2-vinylpyridine, 20 to 40 parts of (3-(methacrylamido) propyl) dimethyl (3-thiopropyl) ammonium hydroxide inner salt, 35 to 55 parts of N, N-dimethylacrylamide, 10 to 25 parts of 4-vinylpyridine, 300 to 500 parts of water and 1 to 5 parts of an initiator. According to the filtrate reducer, cations and anions are concentrated on one monomer molecule, so that the synthesized product contains the cations and the anions with the same charge number, has good adsorption capacity and salt response characteristics, is compatible with salt essentially, can effectively resist high temperature and high salt, and can be recycled. And the viscosity-increasing and filtrate-reducing agent has good viscosity-increasing and filtrate-reducing effects on the drilling fluid.

The invention discloses a temperature / CO2 dual-response zwitterionic hydrogel profile control agent, which is prepared by taking a monomer A, a monomer B and a monomer C as raw materials, adding a cross-linking agent and an initiator, and carrying out polymerization reaction in a water medium. The monomer A is selected from any one of acrylamide, acrylic acid and 1-vinyl-2-pyrrolidone; the monomer B is selected from any one of [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, 2-methacryloyloxyethyl phosphorylcholine and 3-((2-(methacryloyloxy) ethyl) dimethylamino) propionic acid inner salt; and the monomer C is selected from any one of 2-(dimethylamino) ethyl methacrylate, dimethylamino propyl methacrylamide and polyethyleneimine. The profile control agent has double swelling mechanisms, has outstanding temperature and salt resistance, resists 220000 mg / L of mineralization water, is suitable for high-salt reservoirs, and is good in long-term aging property.

The invention belongs to the technical field of rare and precious metal recovery, and particularly relates to a method for recovering metallic silver from waste crystalline silicon battery pieces, which comprises the following steps: (1) putting the waste crystalline silicon battery pieces into an inorganic alkali aqueous solution for soaking reaction to obtain an aluminum-containing solution and dealuminized crystalline silicon pieces; (2) adding the dealuminized crystal silicon wafer into a mixed solution of organic acid and hydrogen peroxide for soaking reaction, filtering and washing to respectively obtain silver-containing filtrate and a silver-removed silicon wafer; (3) carrying out chlorination precipitation reaction on the silver-containing filtrate and a chlorine source, filtering and drying to obtain silver chloride powder; (4) adding silver chloride powder into an ammonia water solution, heating and stirring to completely dissolve silver chloride to obtain a silver-ammonia solution; (5) adding PVP (Polyvinyl Pyrrolidone) into the silver-ammonia solution, heating and stirring until the PVP is completely dissolved, adding ascorbic acid, and carrying out reduction reaction at room temperature to obtain metal silver powder precipitate; and filtering, washing and drying the precipitate to obtain the spherical silver powder. According to the method, the silver recovery efficiency is high, the spherical nanoscale silver powder can be prepared, and the purity is high.

The purpose of the present invention is to provide a curing catalyst that is highly stable and has a practical curing speed. The present invention provides a curing catalyst [B] used for curing a polymer [A] that has a reactive hydrolyzable silicon-containing group. The curing catalyst [B] contains the reaction products of a metal alkoxide [B1] and an ammonium hydroxide [B2]. The metal alkoxide [B1] includes one or both of a titanium compound [B1a] that is represented by chemical formula (1), and another metal alkoxide [B1b]. The other metal alkoxide [B1b] is an alkoxide of a metal other than titanium, and the ammonium hydroxide [B2] is represented by chemical formula (2).

The invention provides a VOCs catalyst as well as a preparation method and application thereof, and belongs to the field of atmosphere prevention and control. The invention provides a VOCs (Volatile Organic Compounds) catalyst. The VOCs catalyst comprises a modified ZSM-5 zeolite molecular sieve and active metal and / or oxide of the active metal loaded on the modified ZSM-5 zeolite molecular sieve, the preparation method of the modified ZSM-5 zeolite molecular sieve comprises the following steps: mixing a ZSM-5 zeolite molecular sieve and an organic alkali solution, and carrying out a hydrothermal reaction to obtain an organic alkali-loaded ZSM-5 zeolite molecular sieve; and roasting the ZSM-5 zeolite molecular sieve loaded with the organic alkali, and removing the organic alkali to obtain the modified ZSM-5 zeolite molecular sieve, the organic alkali solution is a tetrapropylammonium hydroxide solution.

The invention relates to the field of catalysts, in particular to a preparation method of a green and efficient copper catalyst. Comprising the following steps: (1) mixing basic cupric carbonate, ammonia water and water, adding ammonium salt at the same time, and preparing a copper ammonia solution as a precursor solution at room temperature; (2) mixing the precursor solution with a carrier or a carrier precursor to realize active component loading and catalyst preparation; and (3) filtering, washing, drying and roasting the mixed system in the step (2) to prepare the copper-based catalyst. According to the preparation method of the copper ammonia complexing precursor solution, preparation of the copper ammonia complexing solution at room temperature can be achieved, heating operation in the precursor preparation process is avoided, meanwhile, the nitrogen content of the system and nitrogen emission in the subsequent roasting process can be reduced by preparing the copper-based catalyst through the basic copper carbonate precursor, and efficient and green preparation of the catalyst is achieved.

The invention belongs to the technical field of rare earth materials, and discloses a preparation method of high-purity sphere-like nano yttrium oxide powder. The method comprises the following preparation steps: (1) adding Y2O3 powder into concentrated hydrochloric acid, heating, stirring and dissolving, and then diluting with an ethanol water solution to obtain a YCl3 solution; (2) mixing ammonia water, a quaternary ammonium base aqueous solution and ethanol to prepare a precipitant solution, and dropwise adding the precipitant solution into the YCl3 solution in the step (1) for precipitation reaction to precipitate Y < 3 + >; and (3) separating and drying the precipitate obtained in the step (2), and then carrying out high-temperature calcination to obtain the high-purity spheroidal nano yttrium oxide powder. According to the preparation method, the ethanol water solution of YCl3 is used as a reaction solution, ammonia water is used as a main precipitator, quaternary ammonium base is used as an auxiliary precipitator and a surface active structure regulating agent, and yttrium oxide powder with the purity not lower than 5N and the particle size smaller than 100nm can be obtained.

The invention belongs to the technical field of non-ferrous metal hydrometallurgy, and discloses a method for extracting valuable metal from laterite-nickel ore pickle liquor. According to the method, nickel and cobalt can be complexed with ammonia under the ammoniacal condition, and then carbonate is added to selectively separate manganese. For a nickel-cobalt-ammonia solution, an oxidizing agent is used for oxidizing a cobalt-ammonia solution, a divalent cobalt-ammonia complex is oxidized into a trivalent cobalt-ammonia complex, then nickel is masked, and liquid caustic soda is added, so that cobalt can be separated. The remaining nickel complex is oxidized and decomposed under the strong oxidation effect of the unmasking agent to obtain free nickel, then liquid caustic soda is added to separate nickel, and the cracked masking agent is left in the filtrate and can be recycled. The method is easy to operate, easy to industrialize, low in cost and free of environmental pollution, the valuable metal elements in the laterite-nickel ore hydrochloric acid normal-pressure pickle liquor can be extracted in a pure compound product mode, solid waste residues are not generated, valuable metal element resources are fully utilized, and large economic benefits can be generated.

When considering the prior art, the objective of the present invention is to provide a curing catalyst which is highly safe and has a curing rate suitable for practical use. According to the present invention, provided is a curing catalyst [B] which is used for curing a polymer [A] having a reactive hydrolyzable silicon-containing group, the curing catalyst [B] containing a metal alkoxide [B1] and an ammonium hydroxide [B2], wherein: the metal alkoxide [B1] includes one or both of a titanium compound [B1a] represented by chemical formula (1) and another metal alkoxide [B1b]; the another metal alkoxide [B1b] is an alkoxide of a metal other than titanium; and the ammonium hydroxide [B2] is represented by chemical formula (2).

The invention provides a solid waste-based cementing material and a preparation method thereof, and relates to the technical field of solid waste resource utilization and cementing material preparation. The cementing material is prepared by mixing and grinding 60-80 parts by weight of modified phosphogypsum and 20-40 parts by weight of an auxiliary material, and the auxiliary material comprises at least one of steel slag powder, fly ash, lithium slag and mineral slag; a preparation method of the modified ardealite comprises the following steps: carrying out microwave treatment on ardealite for 0.5-1 hour, mixing the treated ardealite with aluminum oxide, attapulgite and sodium lignosulphonate, adding a tetramethylammonium hydroxide solution, and drying to obtain the modified ardealite. According to the solid waste-based cementing material disclosed by the invention, the phosphogypsum is modified, so that the solid waste-based cementing material has the characteristics of high strength, stable cementing, strong erosion resistance and the like while the mixing amount of the phosphogypsum is increased.

The invention discloses a catalyst for an n-butene isomerization reaction and a preparation method thereof, and belongs to the technical field of catalysts. The preparation method comprises the following steps: mixing a silicon source, an aluminum source, tetrapropylammonium hydroxide and water, adding boric acid, and crystallizing to obtain a seed crystal; the method comprises the following steps: mixing a silicon source, an aluminum source, pyridine and water, adding a seed crystal and ammonium fluoride, and crystallizing to obtain a core-shell type molecular sieve; adding the core-shell type molecular sieve into the bimetallic complex solution for dipping to obtain a metal-loaded type molecular sieve; adding the metal-loaded molecular sieve into a triethyl phosphine ethanol solution for treatment to obtain a phosphorus-modified molecular sieve; uniformly mixing the phosphorus-modified molecular sieve, pseudo-boehmite, sesbania powder and water, kneading, performing extrusion molding, drying and calcining to obtain the catalyst. The catalyst prepared by the invention is used for n-butene isomerization reaction, and has excellent catalytic activity and isobutene selectivity.

The invention discloses an alkaline medium-coarsening micro-etching solution as well as a preparation method and a micro-etching method thereof, and relates to the technical field of printed circuit board production. The alkaline medium-coarsening micro-etching liquid is prepared from the following components in mass concentration: 5-30 g / L of ammonium chloride, 0.5-2 g / L of tetramethylammonium hydroxide, 5-15 g / L of ammonia water, 2-10% of a catalyst, 0.1-1% of a wetting agent, 0.2-2% of an accelerator, 0.3-1.5% of a stabilizer, 0.5-5% of a color difference regulator and the balance of deionized water. The invention provides an alkaline medium-coarsening micro-etching solution and a preparation method and a micro-etching method thereof, which can solve the problem of color change of a board surface after micro-etching of a circuit board and overcome the defect that a sulfuric acid hydrogen peroxide micro-etching system is easily polluted by chloride ions, and can effectively improve the problem that hydrogen peroxide is easily decomposed by replacing sulfuric acid hydrogen peroxide with an alkaline substance. And the micro-etching rate is stable.

The invention provides a method for synthesizing an MSE molecular sieve, and belongs to the technical field of molecular sieves. The invention uses tetramethylammonium hydroxide and tetrapropylammonium hydroxide as mixed template agents, stirs and mixes a silicon source, an aluminum source, sodium oxide, potassium oxide, a template agent and water, and then directly crystallizes, and then washes, dries and calcines to synthesize an MSE molecular sieve. The method for synthesizing an MSE molecular sieve provided by the invention does not require the addition of external crystal seeds, has easily available raw materials, is low in cost, and has simple steps, thus laying a foundation for further industrial production.

The present disclosure provides various characteristics for treating tail brine extracted from a bromine plant, when said brine contains residual bromine and chlorine with low pH and high ORP values that will be used in a lithium extraction production facility. The method conditions the extracted tail brine by adding either sodium hydroxide or ammonium hydroxide to bring its pH levels to between 5.5 and 6.5. The conditioned tail brine then gets pre-treated with hydrazine in either less than 70 ppm if used in combination with sodium hydroxide; or 195 ppm if used with ammonium hydroxide until the ORP levels have reached to below 100 mV. The extracted tail brine is then processed through DLE processing device having four groups of adsorption columns filled with lithium adsorption resins that, after treating the extracted tail brine, discharges the raw eluate solution to an effluent tail brine tank using an effluent tail brine pump connected to the DLE processing device.

The invention discloses a preparation method of vinylene carbonate, which comprises the following step: reacting chloroethylene carbonate under the action of a catalyst to generate vinylene carbonate, wherein the catalyst comprises a modified titanium silicalite molecular sieve and a metal salt loaded on the modified titanium silicalite molecular sieve, the modified titanium silicalite molecular sieve is obtained by calcining the titanium silicalite molecular sieve and then etching the titanium silicalite molecular sieve with tetraalkyl ammonium hydroxide, and metal elements in the metal salt have d orbital electrons; practice shows that the method can directly remove hydrogen chloride from chloroethylene carbonate to generate vinylene carbonate, the reaction temperature is unexpectedly reduced and can be reduced to 200 DEG C or even below 180 DEG C, the energy consumption and the safety performance in the production process are greatly reduced, a solvent is not needed in the reaction process, and the method is suitable for industrial production. And no solid waste is generated.

The invention belongs to the technical field of fine chemical synthesis, and discloses a preparation method of decynediol. The preparation method comprises the following steps: cooling a solvent, mixing with a catalyst, introducing acetylene, and heating to a reaction temperature; dropwise adding methyl isobutyl ketone, and after dropwise adding is finished, carrying out heat preservation reaction to obtain a first product system; adding water, and carrying out layering separation to obtain a decynediol crude product; and finally, rectifying, and recovering the solvent to prepare the decynediol. The catalyst comprises a methoxide and tetrabutyl ammonium hydroxide. According to the preparation method of the decynediol, provided by the invention, the reaction conversion rate and selectivity can be remarkably improved, so that the product yield is improved; the method is simple in process and low in equipment requirement, 100% application of the recovered solvent can be achieved, the recovered solvent is continuously applied for 10 times to prepare the decynediol, and the method still has excellent conversion rate and selectivity, and is a safe and green production method which is low in raw material cost.

The invention provides a method for preparing high-purity flaky alumina based on a hydrolysis method, and belongs to the field of high-purity flaky alumina powder. The method comprises the steps that metal aluminum scraps are pretreated; the method comprises the following steps: putting metal aluminum scraps, an alkaline organic matter catalyst and a morphology control agent into water, and carrying out a hydrolysis reaction at a set temperature for a set time to obtain a reaction mixed solution; carrying out solid-liquid separation, washing and drying on the reaction mixed solution to obtain flaky aluminum hydroxide; and roasting the flaky aluminum hydroxide to remove crystal water so as to obtain high-purity flaky aluminum oxide, wherein the alkaline organic matter catalyst comprises at least one of the following components: tetraethylammonium hydroxide, tetramethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide; the morphology control agent comprises at least one of ammonium bifluoride and ammonium fluoride. The preparation method disclosed by the invention is simple in process flow, free of an impurity removal process, mild in reaction condition, short in reaction time and free of environmental pollution, and the product is regular in shape and high in purity.

The invention provides a preparation method of silver-coated copper powder, and relates to the technical field of metal powder preparation. According to the preparation method, a copper core is directly prepared by adopting a chemical reduction method, then a silver layer is grown on the surface of the copper core by adopting a chemical plating method, and finally, the powder compactness is improved by adopting a jet mill polishing mode. The reducing agents with different reducing effects are added twice to reduce copper sulfate, so that the initial reaction rate is reduced, the whole reaction is stable, and the sphericity degree of copper crystal nucleus is improved; meanwhile, sulfate radicals in the reaction system and silver ions in the subsequent reaction can form silver sulfate precipitates, the reduction speed of silver-ammonia complex ions is further reduced, and the silver layer grows compactly; and meanwhile, the incompletely reacted glucose remained in the reaction system can be used for continuously reducing silver-ammonia complex ions when the silver-ammonia solution is subsequently dropwise added. By strictly controlling the growth speed of the silver powder from the seed crystal to the particles, the structure defects caused by rapid growth are reduced, and the performance of the final product is improved.

The invention discloses a novel method for preparing a TS-1 zeolite molecular sieve from fly ash, which comprises the following steps: mixing and grinding fly ash and anhydrous sodium carbonate (Na2CO3) according to a certain proportion, and roasting for a certain time to obtain nepheline (NaAlSiO4); the preparation method comprises the following steps: mixing nepheline with hydrochloric acid (HCl) with a certain concentration according to a certain solid-to-liquid ratio, stirring for a certain time, and then filtering, washing, drying and grinding to obtain SiO2 powder; the method comprises the following steps: weighing a certain mass of SiO2, tetrapropylammonium hydroxide (TPAOH) and deionized water according to a molar ratio of SiO2: TPAOH: H2O of 1: 0.4: 50 at normal temperature, mixing and stirring to obtain a solution A, slowly melting a certain mass of tetrabutyl titanate into isopropanol to obtain a solution B, adding the solution B into the solution A to obtain a solution C, heating and stirring the solution C at 80-90 DEG C for 1 hour, putting the solution C into a crystallization reaction kettle, and carrying out crystallization for 2-3 hours at the temperature of 80-90 DEG C; crystallizing for a period of time at a certain temperature; after the crystallization is completed, filtering, washing and drying to obtain the TS-1 molecular sieve. The novel method for preparing the TS-1 zeolite molecular sieve from the fly ash is simple and safe to operate and relatively low in cost, and has the characteristics of small crystal grains and multiple mesopores. Meanwhile, industrial solid waste can be utilized, the production cost is reduced, a new method is provided for comprehensive utilization of the fly ash, the additional value of the fly ash is improved, and the method has very important practical significance on actual industrial production.

The invention discloses a special CMP (Chemical Mechanical Polishing) solution for a silicon carbide wafer. The special CMP solution consists of the following components: 5-12% of alpha-spherical nano aluminum oxide; 1-5% of a complexing agent, preferably citric acid; 0.1%-1.0% of a composite inhibitor; 0.5-3% of an oxidizing agent which is ammonium persulfate; 0.05%-0.5% of a dispersion stabilizer; the pH regulator is tetramethylammonium hydroxide and is used for regulating the pH of the polishing solution to 8-11; and the balance of deionized water or ultrapure water. The preparation method of the polishing solution comprises the following steps: S1, adding the alpha-spherical nano aluminum oxide into polyether polyol and ultrapure water, and carrying out ultrasonic dispersion; s2, adding a complexing agent, a composite inhibitor and an oxidizing agent, and magnetically stirring; s3, adjusting the pH (Potential of Hydrogen) to 8 to 11 by using a tetramethylammonium hydroxide solution; and S4, after standing at room temperature, filtering through a filter membrane to obtain the CMP polishing solution. The silicon carbide CMP polishing solution provided by the invention combines alpha-spherical nano aluminum oxide and an ammonium persulfate / PEG 6000 / composite inhibitor synergistic system, can ensure high material removal rate and low defect density, and has excellent dispersion stability and metal residue control ability.

The invention relates to the field of molecular sieves, in particular to a titanium silicalite molecular sieve TS-1 nanosheet and a preparation method and application thereof.The titanium silicalite molecular sieve TS-1 nanosheet is prepared by using tetrapropylammonium hydroxide, tetraethyl orthosilicate, tetrabutyl titanate and urea as raw materials through crystallization and calcination. A urea-assisted synthesis method is adopted, urea can be spontaneously dispersed on the surface, perpendicular to the b axis, of a crystal, growth of the crystal in the direction of the b axis is inhibited, and then the sheet-shaped titanium silicalite molecular sieve TS-1 is formed after calcination. According to the invention, isopropanol is not required to be used as a solvent and a regulator for hydrolysis of tetraethyl orthosilicate and tetrabutyl titanate, so that the purpose of synthesizing the titanium silicalite molecular sieve TS-1 nanosheet at low cost is achieved, and the technical defect of structural collapse caused by calcination in the prior art is overcome.

This invention provides a dry powder drag-reducing agent for fracturing fluids and its preparation method, belonging to the technical field of fracturing materials for drilling. The method includes the following steps: dissolving 4-bromobutyryl chloride and N-dodecylmethylamine in acetonitrile, heating and stirring to react; adding polyethylene glycol monomethyl ether acrylate and dichloromethane; stirring under a nitrogen atmosphere; purifying to obtain a double-tailed hydrophobic monomer; mixing core-shell Fe3O4 / SiO2 composite nanoparticles, ethanol aqueous solution, KH570, and ammonia solution; stirring; purifying to obtain modified SiO2 / Fe3O4; adding acrylamide, acrylic acid, sodium 2-acrylamido-2-methylpropanesulfonate, the double-tailed hydrophobic monomer, and modified SiO2 / Fe3O4 to water; adjusting the pH value; mixing and stirring with nitrogen gas; adding an azo initiator; stirring; cooling; purifying; vacuum drying; and pulverizing into powder to obtain the dry powder drag-reducing agent for fracturing fluids. This invention achieves good drag-reducing performance while also possessing certain heat resistance, making it better suited for fracturing operations in drilling processes.

The invention provides a method for synthesizing furoate. The method comprises the step that furfural and tetraalkyl ammonium hydroxide react in a solvent in the presence of a metal oxide catalyst and an oxygen source at the temperature of 50-100 DEG C to generate furoate. The method provided by the invention has the advantages of mild reaction, simple operation, low cost and environmental protection, and is easy for industrial popularization.

The invention relates to a method for preparing high-purity ammonium rhenate from crude rhenate. The method specifically comprises the following steps: S1, preparing a crude rhenate solution; s2, preparing a calcium hydroxide suspension; s3, anion impurities in the crude rhenate solution are separated through the calcium hydroxide suspension, and rhenate filtrate is obtained; s4, cation impurities in the rhenate filtrate are adsorbed and separated through cation resin, and a rhenate solution is obtained; s5, treating through a two-chamber bipolar membrane stack electrodialysis system to obtain a perrhenic acid solution; and S6, ammonium rhenate is prepared from ammonium hydroxide in a perrhenic acid solution. According to the method for preparing the high-purity ammonium rhenate from the crude rhenate, the technological process is short and easy to operate, impurities in the crude rhenate form an open circuit, and the flow recovery rate is higher than 99%; the purity of the obtained ammonium rhenate is 99.995% or above, the ammonium rhenate product is stable in quality, waste water and waste gas are not generated, and the method has the advantages of being obvious in environmental protection advantage, free of evaporation and concentration and low in energy consumption.

The application discloses a preparation method and purification process of copper hydroxide, a certain amount of anhydrous copper sulfate is accurately weighed, and a certain volume of deionized water is added to prepare a solution with a certain concentration, a copper ammonia solution is prepared: slurry is prepared from circuit board sludge, screening is performed, ammonium bicarbonate or ammonium carbonate is added for reaction, and a copper ammonia solution containing carbonate or bicarbonate is obtained through purification; in addition, high-purity copper powder is added into concentrated ammonia water, concentrated hydrogen peroxide solution is slowly dropped into the concentrated ammonia water, and the dropping is continued until no large amount of bubbles is generated in the solution, and the solution is filtered to obtain a clear indigo blue solution. The production process adds the step of adding a stabilizer and stirring, guarantees the stable state of the copper hydroxide crystal, and enables the copper hydroxide crystal to remain unchanged into copper oxide for one year in an environment with a temperature as high as 60 degrees.

A system and method for generating aqueous ammonia of variable concentration from water and any existing anhydrous ammonia source. The system is modular and safe, can be powered by almost any electrical source, can produce varying volumes of output aqueous ammonia without a prohibitive loss of efficiency, and can produce varying concentrations of output solution.

The invention provides a chemical composition for removing etching residues, which comprises organic ammonium, a corrosion inhibitor, an organic solvent, an inhibitor, hydroxylamine and deionized water, the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide, and the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide; the inhibitor is selected from one or more of fructose, galactose, lactose, maltose, glucose, ascorbic acid, hydroxylamine sulfate and ethanol hydrazine. Compared with the prior art, the chemical composition for removing the etching residues can effectively remove the residues after plasma etching, meanwhile, etching of AlCu, TiN / Ti and silicon oxide is avoided, an operation window is large, and the chemical composition has good application prospects in the semiconductor etching process.

The application discloses a synthesis method of ZSM-35 and ZSM-5 composite zeolite, the composite zeolite takes ZSM-35 as a core and takes ZSM-5 as a shell, and the synthesis method comprises the following steps: (1) uniformly mixing ZSM-35 zeolite, a silicon source, an aluminum source, a template agent, ammonium hydroxide, alcohol and water; then sequentially performing dynamic treatment and static treatment; then separating solid substances and drying the solid substances; (2) mixing the dried substances obtained in the step (1) with inorganic alkali and water, and evaporating water to prepare dry gel; (3) performing crystallization by adopting a gas phase crystallization method, and then performing separation, drying and calcination to obtain the composite zeolite. The ZSM-35 and ZSM-5 composite zeolite can keep the integrity and crystallinity of the ZSM-35 and ZSM-5 skeleton structures, and the core and the shell are combined closely, are not separated and are stable in structure.

The invention relates to a co-production preparation method of dialkyl phosphate and tetraalkyl ammonium sulfate, which comprises the following steps: trialkyl phosphate and trialkylamine are subjected to a first reaction at a first temperature, then a reaction system and excessive sulfuric acid are subjected to a second reaction at a second temperature in the presence of water, and the first temperature is higher than the second temperature; after the reaction is finished, adding an extracting agent to extract the system, and separating to obtain an organic phase and a water phase; removing the extracting agent in the organic phase to obtain dialkyl phosphate; adding tetraalkyl ammonium hydroxide into the water phase until the water phase is neutral or nearly neutral to obtain a water solution containing tetraalkyl ammonium sulfate. According to the method, the dialkyl phosphate can be obtained, the tetraalkyl ammonium sulfate salt with high added value can be obtained, the raw materials are easy to obtain, the process route is simple, the atom economy is high, the method is environment-friendly, the operation is simple, and the cost is low.

An object of the present invention is to provide a photoresist stripping composition which exhibits high stripping performance even for a cured resist, prevents corrosion of substrate-forming metals, such as Cu and Al, that come in contact with a liquid, and can prevent excessive oxidation of a metal such as Cu during a stripping process. The object was achieved by a photoresist stripping composition, the composition containing a quaternary ammonium hydroxide (A), diethylene glycol monoethyl ether (B), glycerin (C), and water (D), wherein a content of (A) is 0.5 to 5 mass % with respect to a total mass of the composition, a content of (B) is 50 to 95 mass % with respect to the total mass of the composition, a content of (C) is 0.5 to 20 mass % with respect to the total mass of the composition, and a content of (D) is less than 20 mass % with respect to the total mass of the composition.