608 results about "Nitromethane" patented technology

An azeotrope-like mixture consisting essentially of chlorotrifluoropropene and at least one component selected from the group consisting of a C₁-C₃ alcohol, a C₅-C₆ hydrocarbon, a halogenated hydrocarbon, methylal, methyl acetone, water, nitromethane, and combinations thereof.

The invention relates to a method for preparing naphthalene sulphonic acid by sulfonating sulfur trioxide in a microreactor, belonging to methods for preparing dye intermediates in the field of fine chemical engineering. The method comprises the following steps: taking alkyl halide and nitromethane as an organic solvent, naphthalene and derivative thereof as the raw material and organic solution of liquid sulfur trioxide as a sulfonating agent, preparing a solution according to the mol ratio of the organic solvent, the raw material and the sulfonating agent of 19-74:1:1-3 in the microreactor of with channel with the diameter of 10-50 microns, and sulfonating the reaction solution to prepare the naphthalene sulphonic acid by controlling the sulfonation reaction temperature to be between 17DEG C below zero and90 DEG C. The method adopts a continuous flow reactor, solves the problem of impossible transient mixing in the conventional reactor, prevents secondary reaction caused by local excess, and is especially suitable for strong exothermic reaction, fast reaction and flammable and explosive reaction. Compared with the preparation technology in the traditional batch reactor, the invention has the advantages of no generation of waste water and waste acid, clean and environment-friendly technology, consumption of sulphonic acid close to the theoretical quantity, fast reaction speed, low sulfonation temperature, high product yield, good repeatability, high labor productivity and low equipment cost.

The invention discloses a method for synthesizing a metal N-heterocyclic carbene complex. The method comprises the following steps of: adding a nickel N-heterocyclic carbene complex and a metal precursor at a molar ratio of 1: (0.5-2) in an organic solvent such as acetonitrile, acetone or nitromethane, and reacting for 1-24 hours at the temperature of 35-70 DEG C; and after the reaction is completed, crystallizing and purifying so as to obtain the metal N-heterocyclic carbene complex. The method has the advantages of mild reaction conditions, simplicity in post-treatment and high yield; a cheap and available N-heterocyclic carbene complex is used so as to replace the traditional silver N-heterocyclic carbene complex to serve as a carbene transfer reagent, which is a further development for the synthesis method of the metal N-heterocyclic carbene complex, thus a foundation is laid for industrialized application of a transition metal N-heterocyclic carbene catalyst.

The invention discloses a method for removing nitrogenous disinfection byproducts in water on the basis of persulfate/light combination, and relates to a method for removing nitrogenous disinfection byproducts in water. The method for removing nitrogenous disinfection byproducts in water on the basis of persulfate/light combination comprises the following steps of: dosing persulfate in water including nitrogenous disinfection byproducts and then carrying out light irradiation. In the invention, persulfate or related composite chemicals are dosed in water and ultraviolet irradiation is utilized, so that abundant radicals are generated to attack the nitrogenous disinfection byproducts so as to realize denitrification and dehalogenation. The method provided by the invention has the advantages that the operation is simple, the effect is clear, the use is sage and no toxic byproduct is generated. By using the method, various nitrogenous disinfection byproducts such as acetonitrile, halogenated nitromethane, nitrosamine compounds, halogenated cyanogens, halogenated acetamide, halogenated pyrrole and organic chloramines can be thoroughly removed; and moreover, the method can be used for synchronously removing other organic matters and restraining and killing the microorganisms in the water.

A multi-component liquid explosive composition and method of mixing thereof. The steps include (a) providing a powder consisting of aluminum preferably having an average particle size of 5 to 50 microns and a surface area of 0.5 to 2 square meters per cubic centimeter containing 0.1 to 5% stearic acid by weight; (b) providing a liquid consisting of nitromethane; and (c) mixing said aluminum powder with the nitromethane to form a liquid explosive formulation detonable at a wide range of temperatures and diameters with a standard commercial number 8 blasting cap.

The present invention relates to a preparation method of 2-bromo-2-nitro-1,3-propanediol. Said method includes the following steps: adding nitromethane, bromine and water into a reactor, slowly adding sodium hydroxide aqueous solution, stirring for 0.5-2hr, introducing chlorine gas, stirring to make reaction at 0-70deg.C to obtain nitrobromoform, then stirring the obtained nitrobromoform, formaldehyde and nitromethane for 0.5-2hr, slowly adding aqueous solution of inorganic alkali catalyst at 60deg.C, making reaction for 0.5-2hr at 0-60deg.C, cooling, crystallizing, filtering and drying so as to obtain 2-bromo-3-nitro-1,3-propanediol.

The present disclosure relates to compositions comprising at least one fluoroolefin and an effective amount of a stabilizer comprising at least one ascorbic acid, terephthalate, or nitromethane, or mixtures thereof. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.

The invention discloses a near-infrared photo-thermal dye based on aza-fluoro borane, preparation and application. The photo-thermal dye comprises an electron-donating group containing lone pair electrons and a basic aza-fluoro borane skeleton. The near-infrared photo-thermal dye based on aza-fluoro borane is prepared through steps as follows: (1), ketene synthesis: ketene is prepared from aldehyde ketone by an addition-elimination reaction under the alkaline condition; (2), an addition reaction of ketene and nitromethane; (3), a cyclization reaction; (4), a coordination reaction: a product obtained in the step (3) coordinates with boron difluoride, and a target product is obtained. The photo-thermal dye can be applied to the technical fields of photodynamic therapy and photo-thermal therapy under the guidance of photo-thermal imaging and photo-acoustic imaging, bio-marker and detection and the like.

An azeotrope-like mixture consisting essentially of chlorotrifluoropropene and at least one component selected from the group consisting of a C₁-C₃ alcohol, a C₅-C₆ hydrocarbon, a halogenated hydrocarbon, methylal, methyl acetone, water, nitromethane, and combinations thereof.

Provided are biocidal compositions comprising 2,2-dibromo-3-nitrilopropionamide and a compound selected from the group consisting of 1-(3-chloroallyl)-3,5,7-triaza-1-azoniaadamantane; tris(hydroxymethyl)-nitromethane; and a hexahydrotriazine compound. The compositions are useful for controlling microorganisms in aqueous or water containing systems.

The invention provides a novel method for preparing taurine. The method comprises the following steps: synthesizing nitroethanol by adopting nitromethane and formaldehyde as raw materials, reacting the nitroethanol with hydrosulphite, reducing, and acidizing through sulfuric acid to obtain the taurine. The method is easy in acquisition of raw materials, simple and convenient to operate and especially suitable for the industrial mass production.

The invention discloses a synthetic method of a dicyclohexylcarbodiimide compound. The method comprises the following steps: taking dicyclohexylurea and di(trichloromethyl) carbonate as a raw material, fully reacting in an organic solvent A at the temperature of 20-110 DEG C, cooling to the room temperature after finishing the reaction, adding triethylamine and neutralizing to pH value of 7-8, post-treating a reaction solution to prepare the dicyclohexylcarbodiimide compound; wherein the organic solvent A is C1-C5 haloalkanes, C3-C8 fatty ester, ketones, ethers, benzene, toluene, xylene, chlorobenzene, nitrobenzene, cyclohexane or nitromethane. The method basically eliminates the problems of big hidden trouble of traditional technical safety and serious three wastes pollution. The method for synthesizing dicyclohexylcarbodiimide compound has the advantages of safety, reliability, simple process, less three wastes, small energy consumption, high overall yield, low cost and excellent product quality, and is suitable for industrialization production and has good economic benefit.

A process for preparing the gold nanoparticles features that the chlorauric acid or gold chloride is added to the alkaline aqueous solution of nitromethane to obtain the aqueous sol of gold nanoparticles. Its advantages are adjustable granularity, high speed and low cost.

The invention discloses a method for synthesizing perfluoroalkyl sulfimide alkali metal salt (M[Rf1SO2NSO2Rf2]) which is abbreviated to M[PFSI], wherein Rf1 and Rf2=CmF2m+1, m=1-8, M=Li, Na, K, Rb, and Cs. The method utilizes potassium (rubidium and cesium) salt of perfluoroalkyl sulfamide and perfluoroalkyl sulfonyl fluoride for reaction in the existence of potassium carbonate (rubidium and cesium), so that the potassium (rubidium and cesium) salt of the perfluoroalkyl sulfimide can be conveniently prepared with high yield which is 70-90%; the high-purity corresponding lithium (or sodium) salt (M[PFSI], M=Li and Na) can be obtained through double decomposition exchange reaction of the potassium (rubidium and cesium) salt and lithium perchlorate (or sodium) in aprotic polar solvent (such as acetonitrile, dimethyl carbonate, nitromethane and the like); and the hydrophobic functionalized ionic liquid composed of cations of sulfonium, ammonium or phosphorus with the [PFSI] through reaction of the prepared alkali metal salt and the sulfonium salt, ammonium salt or phosphorus salt of which the side chain contains functionalized functional groups.

The invention provides a composite additive for reducing the saturated vapor pressure of methanol gasoline. Ethanol, allyl alcohol, toluene, nitromethane, cyclohexanone, ethylenediamine, xylene, 1,2-propylene glycol, isoamyl alcohol and the like are evenly mixed at normal temperature and normal pressure to prepare the composite additive. The composite additive is mixed with industrial methanol to produce denatured alcohol, and the denatured alcohol is mixed with base oil to produce finished products of the methanol gasoline. The composite additive has the advantages of effectively reducing the saturated vapor pressure of the methanol gasoline and eliminating the high-temperature air resistance phenomenon during the use of the methanol gasoline.

The invention discloses a gasoline additive for an environmental protection and energy-saving vehicle. The gasoline additive comprises the following components in parts by weight: 12-18 parts of nitromethane, 5-8 parts of boron, 2-5 parts of pyridine, 6-8 parts of didodecyldimethylammonium, 3-6 parts of carbon fluoride, 1-3 parts of magnesium perchlorate, 2-4 of BHT (butylated hydroxytoluene), 1-3 parts of light calcium carbonate, 4-7 parts of dimethyl acetal, 4-7 parts of 3-methyl-1-butylene, 16-21 parts of methyl tert-butyl ether, 6-9 parts of 2,2,3-triptane, 1-3 parts of cerium oxide, 1-3 parts of beryllium carbide, 5-8 parts of N,N-dimethylaniline and 2-4 parts of amino acid palladium complex. The additive can effectively improve the gasoline quality, increase the gasoline octane number, enhance the fire performance of fuels, can be completely burned together with the fuels without generating precipitation or residues, reduce the tail gas exhaust pollution of motor vehicles, reduce the running cost of the motor vehicles, and has the obvious oil saving effect.

The invention relates to a method for preparing N-hydroxylamine hydrochloride by hydrolyzing N-nitromethane. The method adopts N-nitrite as an isotope raw material to react with a methylating agent so as to obtain the N-nitromethane, and the N-nitromethan is hydrolyzed, condensed, crystallized and filtered to obtain the N-hydroxylamine hydrochloride. Compared with the prior art, the invention has the advantages of reasonable and simple technology, easily obtained raw materials, high isotope conversion rate, product purity, abundance and yield, and the like, can prepare a great amount of N-hydroxylamine hydrochloride with high purity and high abundance and is suitable for mass production.

The present invention relates to a method for producing hydroxylamine hydrochloride by using industrial tail gas absorption waste liquid, and belongs to the technical field of hydroxylamine hydrochloride production. The method comprises: decolorizing industrial tail gas absorption waste liquid with urea; adding hydrochloric acid and nitromethane to the decolorized industrial tail gas absorption waste liquid, and carrying out a hydrolysis reaction under a heating reflux state; and carrying out concentration and post-treatment on the hydrolyzed liquid so as to obtain the hydroxylamine hydrochloride. According to the present invention, the industrial tail gas absorption waste liquid is completely utilized, the industrial water consumption is reduced, the cost is saved, and advantages of energy saving and environmental protection are provided.

The invention discloses a synthetic method of an atorvastatin calcium intermediate. The synthetic method comprises the following steps: preparing [(4R, 6S)-6- brooethyl-2,2-diemthyl-1,3-dioxane-4-group] tert-butyl acetate (5) by (3S)-4-bromine-3-hydroxyl ethyl butyrate through condensation, asymmetric biological catalytic reduction and hydroxyl protection; and preparing an atorvastatin calcium intermediate [(4R, 6S)-6-(2-aminoethyl)-2,2-dimethyl-1,3-dioxane-4-group] tert-butyl acetate through catalytic hydrogenation reduction of raney nickel after 5 is condensed with nitromethane under action of cuprous bromide and a nitrogen-containing compound ligand. According to the synthetic method disclosed by the invention, steps are shortened, cost is lowered, and therefore, the synthetic method is more suitable for large-scale preparation.