112 results about "Bromomethane" patented technology

The invention discloses a catalyst which is used when methane is transformed into hydrobromic ether through the bromine oxidation reaction, and the catalyst which is used when preparing heavy hydrocarbons by using the hydrobromic ether further, and belongs to the technology field of the catalyst and the preparation method thereof. The first type of catalyst which is used when the methane is transformed into the hydrobromic ether through the bromine oxidation reaction comprises the preparation step that water-soluble metallic compound precursors such as Rh, Ru, Cu, Zn, Ag, Ce, V, W, Cd, Mo, Mn, Cr, La, etc. are mixed with a silica precursor, the mixture is processed through hydrolyzation, drying and roasting, and then the catalyst is obtained; the first type of catalyst can lead definite masses of reactant composed of the methane, HBr, H2O and oxygen sources (that is O2, air or oxygen-enriched air) to perform the catalytic bromine oxidation reaction, to generate target products such as CH3Br, CH2Br2, etc. The second type of catalyst, which is used when preparing the heavy hydrocarbons by using the hydrobromic ether further, includes the preparation step that molecular sieves such as HZSM-5, HY, H Beta, 3A, 4A, 5A, 13X, etc. load metallic compounds composed of Zn and Mg, so that the catalyst is obtained; the second type of catalyst can lead the methane bromination products composed of the CH3Br and the CH2Br2 to further react so as to generate the heavy hydrocarbons containing C3 to C13 and HBr, wherein, the HBr is used as a circular reaction medium.

The specification discloses a process for the production of olefins including ethylene, propylene and butenes from methyl bromide. In a chemical reaction methyl bromide is dehydrobrominated to the olefin and hydrogen bromide. The reaction is carried out at elevated temperatures, preferably in the range of 300° C. to 500° C. A catalyst comprising a zeolite may be used.

The invention provides a catalyst used for the preparation of bromomethane and CO through methane bromination-oxidation. The catalyst contains a main active component and a carrier, wherein the main active component is one or more selected from FePO4, Fe3P2O7 and Fe3(P2O7)2, the carrier is one or more of TiC-SiC and TiO2-SiC, and the content of the main active component in the catalyst is 1.0-50.0wt%. The catalyst is prepared through the steps of supporting an impregnation liquid containing the main active component onto the carrier through an impregnation technology, drying and roasting, and the catalyst can catalyze a mixture comprising methane, oxygen and an aqueous solution of HBr converted into bromomethane and CO in a high activity and high selectivity manner under reaction conditions comprising normal pressure and a temperature of 400-800DEG C. The catalyst has the advantages of good performances, on obvious inactivation in a continuous reaction process carried out for above 1400h, and no carbon deposition on the catalyst.

The invention provides a new technology for recycling metribuzin methylated mother liquor. The technology uses bromomethane as methylating agent to react with triazone under alkaline condition and obtain metribuzin; and methylated mother and bromine are recycled for cyclic utilization, thus achieving the aim of the reutilization of wastewater. The inorganic salt content and discharge amount of waste water in methylating working section can be effectively reduced, and the difficulty and cost of treating waste water are largely reduced. The invention has good environmental benefit, social benefit and economic benefit.

The invention discloses a novel method for disinfecting cultural relics by fumigation, which can be applied to prevention and control of pest mildew diseases of collected and exhibited cultural relics by a museum. The method is characterized in that flammable, combustible, environment-polluted and toxic fumigants such as ethylene oxide, bromomethane and the like are replaced by one or more out of safe, nontoxic and environment-friendly plant fumigants such as cinnamyl aldehyde, citronellal, geranialdehyde and the like, and composite high-purity nitrogen is used for fumigating the cultural relics, so that the efficacy of plant components can be improved; the temperature and the humidity during fumigation are adjusted, so that the cultural relics made of different materials are maintained under a relatively stable condition, and damage to the main bodies of the cultural relics is avoided.

The invention provides a compound agent, which is prepared by performing binary compounding on plant-source compounds of ethyl isothiocyanate and allyl isothiocyanate according to the weight ratio of 1:7-7:1. The compound agent can be prepared into a dissoluble liquid, an aqueous emulsion, an oil solution or a tablet, and is applied to preparing a pesticide fumigant for controlling insect pests and harmful mould fungi in storehouses and soil. The compound agent has the advantages of obvious synergy, high bacteriostatic and insecticidal activity, less relative usage, and obvious fumigation effect on pests of food, tobacco and soil nematodes and the like, and can be used for substituting bromomethane which is forbidden fumigant.

The invention provides a wood parasitic nematode fumigant, which is characterized in that methyl iodide dissolved in liquefied carbon dioxide gas is used instead of destructive matters from an ozonosphere, to use bromomethane limited in the world range; or, the methyl iodide is used together with any, or two or more compound of the sulfuryl fluoride, the methyl isothiocyanate, the phosphine, the ethylene oxide, the carbonyl sulfide and the propylene oxide; the invention also provides a wood fumigating method, which can kill the wood parasitic nematode by using the fumigant.

The invention discloses a preparation method of ipratropium bromide. The method comprises the following steps that as a starting material, methyl phenylacetate (III) undergoes the substitution reaction to produce alpha-formyl methyl phenylacetate (IV); tropic alcohol reacts with bromomethane to produce a compound (II); the compound (II) reacts with a compound (IV) to produce a compound (V); the compound (V) undergoes a reductive reaction to produce ipratropium bromide anhydrous substance, and then ipratropium bromide (VII) is produced through refining preparation. The method has the advantages of simple operation, high safety, a low cost and suitability for industrial production.

The invention provides a water treatment method for removing trihalomethane in drinking water by utilizing UV (ultraviolet) / H2O2. The water treatment method comprises the following steps: introducing the drinking water into a reaction device, starting a magnetic stirrer in the reaction device, and adjusting the rotational speed of the magnetic stirrer to be 125-300 r / min; putting a UV lamp tube capable of stably emitting light into the reaction device, and arranging a quartz sleeve tube outside the UV lamp tube; adding H2O2 into the drinking water in the reaction device for treatment, wherein the additive amount of H2O2 is 5-30 mmol / L, the power of a UV lamp is 12-75 W, and the retention time is 20-60 minutes; removing trichloromethane, tribromethane, dibromochloromethane and bromodichloromethane contained in trihalomethane in the treated drinking water, wherein the removal rates of trichloromethane, tribromethane, dibromochloromethane and bromodichloromethane can reach 43.97%, 99.61%, 99.38% and 93.07% respectively. The water treatment method has the benefits that the method is capable of completely decomposing trihalomethane, free of secondary pollution, low in H2O2 consumption and low in energy consumption, has a certain removal effect on TOC (total organic carbon) and UV254 in the drinking water, and has a very good removal effect on trihalomethane.

The invention discloses a method for preparing dimethylbenzene, comprising on modified HZSM-5 molecular-sieve-based catalyst, adopting methyl bromide as methylation reagent, leading the methyl bromide to react with methylbenzene, and generating the target product dimethylbenzene and byproduct hydrogen bromide. The method has the advantages of comparatively low reaction temperature, higher conversion rate of reactant, less by product, long service life of the catalyst, high efficiency and low cost.

The invention discloses a soil particle fumigant taking one or two of activated carbon particles and activated aluminum oxide particles as a particle carrier which is absorbed with the fumigant, wherein the fumigant is one or two of acquinite and 1,3-dichloropropylene. The soil particle fumigant is characterized in that the particle carrier absorbed with the fumigant is externally coated with a coating made from at least one material of urea, polyvinyl alcohol and gelatin. The soil particle fumigant has good effects for killing nematodes and pathogenic bacteria, high drug utilization rate and long residual life, is safe, economic and convenient in use, and is the most dominant substitute for bromomethane (CH3Br) in the worldwide scope at present.

The invention discloses a novel fumigation preparation and application thereof to the quarantine treatment of agricultural products such as fruits, vegetables, flowers and the like. The invention is characterized in that the fumigation preparation is a mixed gas of bromomethane with the purity of 99.95 percent and phosphorus hydride with the purity of 99.995 percent in different proportions, or a mixed gas of bromomethane with the purity of 99.95 percent, phosphorus hydride with the purity of 99.995 percent and air in different proportions, or a mixed gas of bromomethane with the purity of 99.95 percent, phosphorus hydride with the purity of 99.995 percent and carbon dioxide with the purity of 99.95 percent, or a mixed gas consisting of controlled atmosphere gas used for fresh-keeping storage of fresh agricultural products; and the fumigation condition is that the fumigating time is between 1.5 hours and 16 days and the fumigation is the normal temperature fumigation or low temperature fumigation of between 0 and 30 DEG C. The novel fumigation preparation has better synergistic effect among the components, effectively reduces the usage amount of the bromomethane of the conventional fumigation preparation and avoids the damage of the fumigation to the fresh agricultural products such as fruits, vegetables, flowers and the like.

The invention relates to fluorocarbon cationic gemini and gemini surfactants and a synthesis method thereof. The structural formula of the fluorine carbon cationic gemini and gemini surfactants is as follows: the fluorine carbon surfactants are prepared by the following steps that: with perfluoroalkyl iodide as a raw material, after perfluoroalkyl iodide is condensed with butenoic acid, the condensation product is reduced and deiodinated through lithium aluminum hydride to obtain the compound fluorocarbon alcohol; and after the hydroxide radical of the fluorocarbon alcohol is protected, the fluorocarbon alcohol is substitution reaction with different secondary amines and is quaternized by bromomethane to respectively obtain fluorocarbon cationic gemini and gemini surfactants. The method provided by the invention has mild reaction conditions and simpleness and convenience for post-treatment and is applicable to further industrial amplification.

The invention discloses a catalyst for synthesizing 2,3,3,3-tetrafluoropropene, the catalyst comprises an active component and a carrier, the active component is a mixture of Cr or Cr and Ni, the carrier is active gama-Al2O3 or coconut shell activated carbon, and the load capacity of the active component is 0.5-5 wt%. The invention also discloses a preparation method and a purpose of the catalyst, under the effect of the catalyst, bromomethane and tetrafluoroethene are taken as the raw materials to prepare the 2,3,3,3-tetrafluoropropene, the target products selectivity is good, and the yield is high.

The invention discloses a preparation method of a microcapsule fire extinguishing agent taking dibromomethane as a core material, and belongs to the technical field of fire extinguishing agents. Gelatin and sodium polyphosphate are adopted as wall materials, a low-boiling-point and high-volatility dibromomethane liquid extinguishing agent is adopted as a core material, montmorillonite nanoparticles are added to modify a microcapsule shell material, a stable effect is achieved, and the prepared extinguishing agent microcapsule is good in stability in a high-humidity and high-temperature environment, capable of being stored for a long time, safe to use, clean and environment-friendly and has good fire extinguishing performance. The method is simple to operate and high in operability, and theselected wall material is beneficial to microencapsulation of the dibromomethane liquid fire extinguishing agent with low boiling point and high volatility.

The invention discloses treatment restoration particles of soil disease. The treatment restoration particles are mainly formed by an oxidic compound medicament and an inorganic gelatinous material through mixing. The treatment restoration method particularly includes: mixing the oxidic compound medicament with the inorganic gelatinous material according to a mass percentage ratio of 1:5-50; after mixing, vibrating through a vibrating screen to form particles of 5-10 mm in particle size; wrapping the particles with a water-soluble thin film, and heating the water-soluble thin film to enable the same to contract with heat and then closely fit on the outer surfaces of the particles. The treatment restoration particles can sterilize and regulate PH value and physiochemical properties of soil, and are nontoxic and free of residue, teratogenicity, carcinogenicity, mutagenicity and secondary pollution, and the treatment restoration method is a quite effective bromomethane, dazomet and chloroform substitute technology. The treatment restoration method is simple to operate, time-saving, labor-saving, free of breaking original planting habits of farmers, free of being influenced by soil environment, soil desertification, PH value and weather conditions and high in practicability.

The invention discloses a method for continuously preparing paraxylene in a microchannel reactor, which comprises the following steps: under the action of a carrier gas N2, reacting bromomethane and toluene in the microchannel reactor to prepare paraxylene, and recycling the excess hydrogen bromide by using metal oxide. Compared with the prior art, the method uses the bromomethane as the methylation reagent, thereby being beneficial to high-efficiency utilization of the natural gas source. The method has the advantages of low coking and inactivation tendency of the catalyst, lower reaction temperature, higher reactant conversion rate, favorable selectivity for the target product and the like. Meanwhile, the method is simple to operate, has the characteristics of low cost and low environmental pollution, can implement continuous uninterrupted production, and has favorable industrial application prospects.

The invention discloses a soil conditioner preparation method. The soil conditioner comprises, by weight, 10-25% of water-soluble nanometer silica, 10-20% of polymethyl methacrylate, 17-20% of Grondverbeteraar, 13-20% of carboxymethyl cellulose, 15-20% of high activity silicon-calcium-magnesium-potash fertilizer, 10-18% of bromomethane and 3-6% of calcium cyanamide. The soil conditioner is suitable for acidified soil and has pH o 3.3-4.5. In use, a tractor turns up the soil, water is poured into the field and immerses the field for 2-4 days, 4-5 tons of the soil conditioner is sown in the soil, after 5-7 days, the tractor levels the field and crops are planted in the soil. The soil conditioner can improve the soil. The used trace elements and bacterial depressants can improve acidic soil acidity, provide trace elements needed by plant growth and substantially improve a crop yield.

The invention discloses a method for detecting fluorobromomethane residues in bulk drugs. The invention provides a method for detecting bromofluoromethane, and relates to a method for determining bromofluoromethane residues in API, which adopts gas chromatography, takes DB-624 as a chromatographic column and carrier gas as helium, adopts a headspace sample injection method for sample injection, adopts a column temperature programmed heating method, and selects a hydrogen flame ionization detector as a detector. The method has the beneficial effects that the headspace temperature is reduced to25-30 DEG C for detection, fluorobromomethane detected at the temperature can be completely vaporized, so that fluorobromomethane is prevented from reacting, volatilization of fluorobromomethane during direct sample introduction is avoided, and the detection precision is guaranteed.

The invention relates to a method for bromine oxidation reaction of methane. In the process that methyl bromide is produced by oxybromination of methane, and high-carbon hydrocarbon, methanol or dimethyl ether is produced by the methyl bromide, the byproducts of CO and CO2 generated by the reaction process are directly circulated back into a first-stage reactor and are unnecessary to be dischargedout of a device. Simultaneously, a certain amount of the CO and the CO2 from the outside can also be added into the first-stage reactor. Thus, the zero discharge of the waste gases of the CO and theCO2 is achieved under the condition that the yield of the main product methyl bromide is not reduced.

A methyl aluminoxyane as the metallocene cocatalyst for polymerizing olefin is prepared through reaction between bromomethane carrying water vapor and high-grade alkylaluminium.

The invention discloses a copper-based catalyst and a preparation method thereof. The catalyst has characteristic crystal faces of CuO, namely {110}, {111}, {202} and {113}, wherein when the crystal face with the maximum X-ray diffraction intensity is the standard, relative intensity of each crystal face is respectively as follows: I{110} / I{111} is 11-20; I{111} / I{111} is 80-88; I{202} / I{111} is 17-22; I{202} / I{111} is 7-9; and I{113} / I{111} is 11-14. The preparation method of the catalyst comprises the following steps: (1) preparing an aqueous solution containing alcohols, a surfactant and triethanolamine, and dissolving a copper precursor, a zirconium precursor and a lanthanum precursor into the solution; (2) carrying out equivalent-volume impregnation on a carrier by the use of the solution prepared in the step (1), aging and drying; (3) carrying out hydro-thermal treatment on a material prepared in the step (2); and (4) roasting the material obtained in the step (3) so as to prepare the catalyst. The copper-based catalyst prepared by the method can raise conversion rate of bromomethane and selectivity of dimethyl ether.

The invention discloses a method for determining the content of bromomethane in occupational health. The determination method comprises the following steps: 1, preparing a bromomethane standard curve; 2, collecting bromomethane in air to active carbon through a sampling device; 3, disposing the bromomethane-enriched active carbon under closed conditions overnight to balance bromomethane; 4, desorbing bromomethane adsorbed in the active carbon with 1ml of an organic solvent; and 5, quantitatively analyzing bromomethane in the organic solvent by using a gas chromatograph. The determination method has the following advantages: the desorption efficiency is high; an active carbon tube has a small size and is easy to carry and store, and the sampling volume changes as needed; the storage time is long, and reaches up to 5-7d; a desorbed solvent desorption bottle can be disposed on an automatic sampler, so large-scale automatic sample introduction analysis can be easily realized; and a detector is changed to an electron capture detector, so the sensitivity is improved by several orders of magnitudes, and the analysis reliability is improved.

The invention relates to the technical field of pharmacy, and provides a method for detecting bromomethane in a 7-azoniabicyclo [2.2.1] heptane derivative. According to the scheme, bromomethane is used as a reference substance, gas chromatography is used for detecting the content of bromomethane in the 7-azoniabicyclo [2.2.1] heptane derivative, and the content of bromomethane in the 7-azoniabicyclo [2.2.1] heptane derivative is calculated through an external standard method. Methodological verification shows that the detection method provided by the invention is high in sensitivity and accuracy and good in specificity, can be used for effectively detecting whether the 7-azoniabicyclo [2.2.1] heptane derivative contains residual bromomethane or not and accurately measuring the content of the bromomethane, and can be used for effectively controlling the quality of a 7-azoniabicyclo [2.2.1] heptane derivative product; and the safety of a medicament is increased.

The invention discloses a water-soluble corrosion inhibitor. The water-soluble corrosion inhibitor is prepared by the method comprising the following steps: step 1, pouring palmitic acid, a catalyst,methylbenzene and zeolite into a reaction kettle, stirring, heating to reach 80 DEG C, pouring N-phenyl ethylenediamine, and heating to obtain an oil-soluble intermediate; step 2, mixing the oil-soluble intermediate with bromomethane, carrying out backflow, and carrying out a quaternization reaction to obtain a water-soluble intermediate; step 3, mixing the water-soluble intermediate with 1-butyl-3-methylimidazolium tetrafluoroborate to obtain a modified intermediate; and step 4, mixing the modified intermediate with dodecyl benzyl ammonium chloride and octaphenyl polyoxyethyiene, and then dissolving the mixture into an organic solvent with an equal mass to obtain the water-soluble corrosion inhibitor. The water-soluble corrosion inhibitor is high in dispersibility in raw material oil; anda compact and firm protection film is formed on the surface of an oil field pipeline, so that the corrosion of the raw material oil to the oil field pipeline is effectively prevented.

The invention discloses a preparation method of an dimemorfan phosphate intermediate, which comprises the following steps: reacting 5,6,7,8-tetrahydroisoquinoline with bromomethane to obtain quaternary ammonium salt; without separating the product from the solvent, directly carrying out Grignard reaction on the product and p-methylbenzyl magnesium chloride in the solvent to obtain 1-(4-methylbenzyl)-2-methyl-1,2,5,6,7,8-hexahydroisoquinoline; without separating the product from the solvent, directly reducing the product with sodium borohydride, centrifuging, concentrating, extracting, drying and the like to obtain dl(4-methylphenyl-2-methyl-1,2,3,4,5,6,7,8-octahydroisoquinoline (IV); and resolving with L-tartaric acid to obtain the intermediate d-(4-methylbenzyl)-2-methyl-1,2,3,4,5,6,7,8-octahydroisoquinoline L-tartrate (V). The invention can easily implement industrial production, and greatly enhances the yield; and the obtained intermediate has higher purity, and can be continuously reacted to obtain high-purity dimemorfan phosphate.

The invention discloses a copper-based catalyst and a preparation method and an application thereof. The catalyst has CuO characteristic crystal faces of {110}, {111} and {202}, wherein the crystal face with maximum X-ray diffraction intensity is taken as a reference, the relative intensity of each crystal face is 15-20, is 90-95, is 20-25, is 8-10, and is 12-15. The preparation method of the catalyst comprises the following steps: 1) preparing an aqueous solution containing alcohols, a surfactant and triethanolamine, dissolving a copper precursor and a zirconium precursor in the solution; 2) aging the carrier in the prepared solution with equal volume, and drying the material; 3) performing hydro-thermal processing on the prepared material in the step 2); and 4) roasting the prepared material in the step 3) to obtain the catalyst. The copper-based catalyst can increase the conversion rate of bromomethane and selectivity of dimethyl ether.

The invention discloses a phosphine and ethyl formate mixed synergist for treating and killing pests carried by fresh agricultural products, and belongs to the technical field of application of fumigant mixing synergistic technology to pest control. According to the invention, the ratio of two fumigants and the fumigation temperature are mainly controlled to achieve an optimal synergistic effect, the usage amount of a single fumigant is effectively lowered, the defects that the phosphine treatment time is too long, the insecticide resistance is likely to generate, the quality of fresh agricultural products is prone to damage, the ethyl formate treating adsorption is overlarge, the dosage of ethyl formate is over high and the like are overcome, the operation is simple and convenient, and the application is easy. The phosphine and ethyl formate mixed synergist can be used for effectively preventing harm and propagation of fruits, vegetables, seedlings, flowers and the like carrying pests and keeping the quality of fresh agricultural products. A method with the phosphine and ethyl formate mixed synergist has the characteristics of high efficiency, economy, environment friendliness and the like, and is pest control technology capable of effectively replacing methyl bromide fumigation.

The invention discloses a preparation method of a molecular sieve template high-purity hexamethonium hydroxide water solution. The method comprises the following steps: dissolving 1,6-hexamethylenediamine in a formaldehyde-formic acid mixed solution to obtain tetramethyl hexamethylenediamine, dissolving the prepared tetramethyl hexamethylenediamine in a methanol-acetonitrile mixture, introducing methyl chloride or bromomethane to prepare hexamethonium halide, finally adding the hexamethonium halide water solution into a three-chamber two-membrane electrolysis bath, and carrying out electrolysis to obtain the high-purity hexamethonium hydroxide water solution with low concentrations of metal ions, halogen ions and residual organic solvents. By adopting the technical scheme, the preparation method implements green high-yield low-cost industrial production of the hexamethonium hydroxide water solution.

The invention discloses a drilling-fluid fluid loss additive prepared from landfill leachate and a preparation method thereof. Concentrated landfill leachate is added into sulphuric acid to perform sulfonation and dehydration for obtaining sulfonated humic acid; then, the sulfonated humic acid is added into an organic solvent to perform dissolution; in addition, fatty acid amide is added; the reaction is performed under the condition of 140 to 170 DEG C for 0.5 to 2h; then, dibromomethane and epichlorohydrin are added for mixed reaction for 2 to 4h; finally, the prepared products are subjected to vacuum drying under the condition of 75 to 120 DEG C; the required drilling-fluid fluid loss additive can be prepared. The method provided by the invention has the advantages that the flow process is simple; the fluid loss effect is good; the high-temperature resistance can be realized; the landfill leachate is used as raw materials; the waste materials are changed into valuable materials in the real sense; the practical use value and social values are realized.