100 results about "Tetramethylammonium chloride" patented technology

The invention is applied to the technical field of steel making and continuous casting and discloses a method for extracting and observing three-dimensional appearance of non-metallic inclusion in steel in full-scale mode. A steel sample is processed into a thin sheet of (100mm-160mm length)*(50-90mm width)*(3mm-5mm thickness) to be used as an electrolysis anode, a stainless steel thin sheet is used as a cathode, and an organic solution comprising, by weight percentage, 1% -3.0% of tetramethylammonium chloride, 5%-10% of triethanolamine and the balance propylene carbonate is adopted as electrolyte. Current density is controlled to be 0.05A/cm<2>-0.08A/cm<2>, and electrolysis time is controlled to be 24h to 72h. The non-metallic inclusion with different grain size ranges can be obtained after multiple filtrations and separations. The three-dimensional appearance of the non-metallic inclusion with the different grain size ranges can be observed clearly under a scanning electron microscope or a field emission electron microscope. The method is simple in operation, short in cycle and comprehensive in information for reflecting inclusion and has important meaning for understanding and controlling the non-metallic inclusion in the steel.

The present invention is one kind of water-based flow casting slurry of silicon nitride containing alpha-silicon nitride crystal whisker in the solid content of 15-40 wt%. The slurry consists of alpha-silicon nitride crystal whisker 1-10 wt%, silicon nitride powder 16-25 wt%, polyethylene imine 1-8 wt%, PVA 20-35 wt%, propylene glycol 1-8 wt%, and deionized water for the rest. It is prepared through preparing the materials including alpha-silicon nitride crystal whisker, deionized water as solvent, polyethylene imine as dispersant, PVA as adhesive, propylene glycol as plasticizer and ammonium tetramethyl chloride to regulate pH value; mixing; twice ball milling and post-treatment. It has relatively high crystal whisker content, low viscosity and high dispersivity, and is suitable for flow casting to form cast film with flat surface, homogeneously dispersed powder grains and pores, high strength and high machinability.

The invention relates to a copper-based catalyst with high activity and stability for acetylene hydrochlorination. According to the copper-based catalyst, a copper salt is taken as an active component, wherein the copper salt is selected from one or more of copper chloride, copper nitrate, copper sulfate and copper phosphate. The copper-based catalyst is characterized in that a stabilizer is introduced into the copper-based catalyst; and the stabilizer is selected from one or more of guanidine hydrochloride, tetramethylethylenediamine hydrochloride, tetramethylammonium chloride, tetraethylammonium chloride, benzyltrimethylammonium chloride, benzyl triethyl ammonium chloride, tetramethyl phosphorus chloride, tetrabutyl phosphorus chloride, methyl triphenyl phosphorus chloride and 1-butyl triphenylphosphonium. Through introducing the stabilizer has the advantages of being low in cost, low in toxicity, good in heat stability and small steam pressure into the catalyst, and the stability of the copper-based catalyst for acetylene hydrochlorination is significantly improved.

The invention belongs to the technical field of bioelectrochemistry system and aims to provide a method for preparing tetramethylammonium hydroxide by a continuous flow bioelectrochemistry system. The continuous flow bioelectrochemistry system used in the method is formed by a microorganism desalting and synchronous acid/base producing pool with four chambers; the four chambers include an anode chamber, an acidic chamber, a neutral chamber and a basic chamber which are formed by bipolar membranes, cation exchange membranes and anion exchange membranes which are arranged in different orders; with tetramethyl ammonium chloride aqueous solution as raw material, tetramethylammonium hydroxide is prepared in a continuous running manner, wherein chemical energy is converted into electric energy by electricigens during the process; therefore, the method has the characteristics of low preparation cost, small energy consumption and convenient operation, and furthermore, both the economic and environmental benefits are considered.

The invention discloses a high purity rhodium recovery purification method, relates to precious metal recovery purification field, and especially relates to a method for separation and purification of rhodium from other precious metals and base metals in a rhodium-containing waste leachate. According to the method, tetramethylammonium chloride is used as a precipitant, the rhodium solution concentration is controlled to 30-80 g/L, firstly, a small amount of precipitant is added for reaction to remove platinum, iron and other high valence impurities, excessive precipitant is added into the obtained filtrate for boiling and reflux at 110-120 DEG C for 24 h-48 h to obtain a rhodium salt precipitate. High purity rhodium hydroxide is obtained by full washing, dissolving, passing through resin, and potassium hydroxide precipitation carried out on the rhodium salt precipitate. The high purity rhodium recovery purification method is strong in process applicability, simple in operation, low in cost, high in product purity, and free of emission, and may not cause environmental pollution.

The invention discloses a synthesis method of a bentonite loaded iron carbonyl adsorbent. The synthesis method comprises the following steps: dropwise adding a NaOH or Na2CO3 solution into a ferric nitrate solution under water bath stirring condition, aging a product after ending the dropwise adding, diluting hydroxyl, then adding bentonite powder, stirring and separating sediment, adding the solid part into a tetramethylammonium chloride solution, stirring, washing and drying; putting the dried product in a microwave oven and irradiating the product for 3-6 minutes by using microwave; and finally adding the product irradiated by the microwave into a lithium chloride solution, stirring, separating sediment, washing and drying to obtain the bentonite loaded iron carbonyl adsorbent. The synthesis method has the advantage that the microwave is used for decomposing interlayer organic matters and breaking a layer structure of the bentonite to form a sawtooth structure, so that hole diameter is increased, thereby effectively increasing the adsorption speed of the iron carbonyl.

The invention discloses a method for extracting inclusions in steel by non-aqueous solution electrolysis, and belongs to the field of metal physical researching methods. The method comprises the following steps: preparing a non-aqueous solution electrolyte; introducing inclusions and a steel substrate into a non-aqueous solution under certain electrolysis parameter; and then extracting and separating the inclusions with a centrifuging method. The non-aqueous electrolyte component (mass percentage) is prepared from 10 percent of acetylacetone, 0.7 percent of tetramethylammonium chloride, 1 to 5percent of ammonium thiocyanate and the balance of absolute methanol. The electrolysis parameters are as follows: the voltage is 2 to 5 V, and the current is 0.04 to 0.05A/cm<2>. Through control of the electrolyte formula and the electrolysis parameters, the inclusions in the steel are protected from being damaged in the electrolysis process, and the aim of extracting the inclusions in steel in anon-destructive manner is fulfilled.

The invention discloses a method for the synthesis of L-2-aminopropanol. L-alanine is taken as starting material, and L-alanine is esterified, and then is reduced for 0.5-2h in organic solvent with tetramethylammonium borohydride as reducing agent; subsequently, is separated after reduction for 2-6h under 35-55 DEG C. The tetramethylammonium borohydride is prepared by the reaction of potassium borohydride with tetramethylammonium chloride, sodium chloride is added during reaction, the reacted product is separated by removing part of water crystallization. The yield of one crystallization separation is greater than or equal to 98 percent, and purification is not required and the product can be used to reduction directly. Since the method adopts the novel reducing agent, the original 2 tons of potassium borohydride required by each ton of L-2- aminopropanol is reduced to 1.25 tons, and as a result, the cost of levofloxacin is largely reduced.

The invention discloses a real-time fluorescent quantitative PCR probe detection method and a reaction solution and a kit thereof. The reaction solution comprises a PCR buffer solution, a Taq hot start enzyme, dNTP, betaine with the final concentration of 0.04-0.05M, trehalose with the final concentration being not higher than 0.05M and tetramethylammonium chloride with the final concentration of30-40mM, and in the reaction solution, magnesium chloride is further added till the final concentration of the magnesium chloride is 3.0-5.0mM. The normal activity of the Taq hot start enzyme can be protected at high temperature through addition of the betaine and the trehalose with the specific concentrations into the reaction solution, the specificity of a PCR reaction can be improved through addition of the tetramethylammonium chloride with the specific concentration, and the concentration of the magnesium chloride in the reaction solution is further increased, so that the yield and the efficiency of amplification are significantly improved and the time required for the amplification can be effectively shortened while no influence on the specificity of the amplification is guaranteed.

The invention belongs to the technical field of polyacid-based rare-earth materials and provides a Eu/Tb/Tm ternary rare-earth doped polyacid derivative. A molecular formula of the polyacid derivativeis [N(CH3)4]3K2[EuxTbyTm1-x-y(C7H5O2)(H2O)2(alpha-PW11O39)].11H2O (x is greater than or equal to 0.02 and less than or equal to 0.05 and y is greater than or equal to 0.40 and less than or equal to 0.45). The ternary rare-earth doped polyacid derivative is prepared through the following steps: dissolving EuCl3.6H2O, TbCl3.6H2O, TmCl3.6H2O, benzoic acid and a polyacid precursor K14[P2W19O69(H2O)].24H2O into distilled water; regulating the pH (Potential of Hydrogen) to 4.5 to 4.8; stirring at room temperature for 20 to 30min; then heating for 1.0 to 1.5h under the condition of 60+/-5 DEG C; then adding tetramethylammonium chloride while a solution is hot and stirring and reacting for 20 to 30min; after reaction is finished, cooling and filtering; standing and separating colorless block-shaped crystals from filtrate, so as to obtain the ternary rare-earth doped polyacid derivative. In the rare-earth derivative, a polyacid tungsten cluster segment and a benzoic acid ligand can be used forsensitizing rare-earth ions to emit light; Eu<3+> ions have red light emitting performance, Tb<3+> ions have green light emitting performance and Tm<3+> ions have green light emitting performance; and three primary colors can be blended into white light emission according to a certain ratio.

The invention discloses a preparation method of a DNL-1 molecular sieve. The method comprises the following steps: 1) mixing an aluminum source, a phosphorus source, R1, R2, hydrofluoric acid and deionized water to obtain a primary mixture; 2) crystallizing the obtained primary mixture for 0.5-96 h at the temperature of 150-220 DEG C to obtain an aluminum phosphate molecular sieve, wherein the molar ratio of Al2O3, P2O5, R1, R2, HF and H2O in the primary mixture is 1: 0.5: 1.5: 5-20: 0.1-1.5: 0.1-2: 8-40; R1 is diethylethanol or triethanolamine; and R2 is selected from one or more of butyl trimethyl ammonium chloride, tetramethyl ammonium chloride, diethylamine and choline chloride. The preparation method of the aluminum phosphate molecular sieve DNL-1 is simple, and is simple and convenient to operate and low in cost, raw materials are commercial and easily obtained, and thus, the aluminum phosphate molecular sieve DNL-1 is suitable for being produced industrially.

The invention discloses a method for performing electrolytic extraction on ultrafine carbide in steel. The process comprises the following steps: (1) preparing an electrolyte from the following raw materials in percentage by weight: 3 to 5 percent of tetramethylammonium chloride, 8 to 12 percent of acetylacetone, 3 to 6 percent of glycol, 2 to 4 percent of tricthanolamine and the balance of ethanol; and adding 5 g of diphenylguanidine and 10 g of methenamine into each liter of mixed liquid; (2) taking a to-be-extracted steel sample as a positive electrode and performing electrolysis in the electrolyte in the step (1); and (3) performing filtering separation on the electrolyte after electrolysis by using a carbonic ester film, and cleaning with absolute ethanol to separate out the ultrafinecarbide in the steel sample. In the method, a novel organic electrolyte is adopted, the ultrafine carbide is intactly extracted from the steel matrix; the carbonic ester film in the field of life science is applied to separation of the ultrafine carbide, so that the ultrafine carbide in the steel can be extracted successfully; and in the method, the traditional conventional device is adopted, issimple and practical, and is simple and convenient to operate.

The invention discloses a preparation method of organic modified bentonite for adsorbing thiocyanate ions. According to the technical scheme, the organic modified bentonite comprises 50-70 percent of sodium bentonite, 20-38 percent of hexadecyl trimethyl ammonium bromide and 1-16 percent of tetramethyl ammonium chloride. The preparation method comprises the following steps: weighing hexadecyl trimethyl ammonium bromide and tetramethylammonium chloride according to a formula ratio and dissolving in 200 ml of distilled water, and stirring at a temperature of 16 DEG C for 30min to prepare a solution A; weighing sodium bentonite according to the formula ratio and adding sodium bentonite in the solution A, and continuing stirring at a rotating speed of 160 r/min for 1 h to prepare a solution B; and filtering the solution B, then repeatedly washing the obtained filter slag by using the distilled water until no bromide ion or chorine ion exists, performing vacuum filtration to obtain a filter cake, drying the filter cake at a temperature of 75 DEG C for 24 h, and grinding the obtained solid into powder with a particle size of not more than 100 microns. The preparation method has the following beneficial effects that the bentonite which is abundant in the nature is used as a raw material and is low in cost, and the bentonite which is organically modified can be widely applied to the adsorption and the treatment of toxic inorganic matters in industrial wastewater such as electroplating, coking, metal smelting, pesticide and dyeing.