16 results about "Bromomethane" patented technology

The present invention relates to a composition for controlling wood pests and use thereof. Specifically, the composition of the present invention comprises dimethyl disulfide (DMDS) and carbon dioxide (CO2) as active ingredients to control pests present in or occurring on wood. The composition of the present invention replaces bromomethane, thereby minimizing environmental pollution, ensuring uniform diffusion of the composition, and having excellent control efficiency.

This invention relates to "an efficient and safe method for synthesizing perfluoropentanone," belonging to the field of organic chemical synthesis. The method for synthesizing perfluoropentanone is characterized by the following steps: under the action of hexafluoropropylene CF2=CF-CF3, fluorophosgene CF2O, and trifluorobromomethane CF3Br, perfluoropentanone (C5F) is generated in the gas phase. 10 O. The raw materials of this invention are inexpensive and readily available; the product separation and purification are simple; it is easy to industrialize; and it produces less industrial waste.

The invention discloses an intelligent bromomethane dosing system, and relates to the technical field of intelligent dosing, and the system comprises a man-machine interaction module, a weighing module, a control module, a dosing valve module, a vaporization module and an uploading module. According to the invention, the human-computer interaction module inputs basic dosing information and provides an initial instruction for the system; the weighing module collects dynamic dose data in real time, and the weighing module and the control module cooperate to provide regulation and control basis for the control module, so that the control module can accurately adjust opening and closing and the opening degree of the dosing valve module. A temperature control unit of the vaporization module maintains the temperature of a vaporization cavity, an efficiency monitoring unit feeds back the vaporization effect, and the control module combines the feedback and flow control logic and cooperates with the flow adjusted by the dosing valve module to ensure efficient vaporization of liquid bromomethane and improve the dosing effectiveness and process stability; and the uploading module uploads the whole-process information of dosing, and is linked with the data of the man-machine interaction module, the weighing module, the control module and the like, so that the whole-process tracing of dosing data is realized, and the intelligence and manageability of dosing of the system are improved.

The present invention relates to a process for producing carbon comprising the step of exothermically pyrolyzing a starting composition containing at least 50% by mole of dibromomethane, less than 5% by mole of hydrogen donor and less than 0.5% by mole of oxygen in a pyrolysis reactor at a temperature of 600 to 2,000°C to carbon and hydrogen bromide.

The present invention relates to a method of reducing methane production in a ruminant and / or improving the production performance of a ruminant, said method comprising the step of administering to the ruminant one or more dihalomethane selected from the group consisting of dibromomethane, diiodomethane, bromoiodomethane and chloroiodomethane in an effective amount in the range of 2-50 mg dihalomethane / kg DM. The invention also relates to one or more dihalomethanes in ruminant feed additives and methods for reducing methane production in ruminants and / or improving the production performance of ruminants.

The application belongs to the technical field of medicine preparation, and particularly relates to a method for synthesizing difluorocyclobutenedione based on ruthenium catalyzed carbonylation reaction, and the specific steps are as follows: in step one, aromatic alkyne, ruthenium catalyst, base, tetrahydrofuran and difluorodibromomethane are put into an autoclave, and carbon monoxide 10 atm is introduced for reaction, the reaction time is 12 h, and the reaction temperature is 80-100 DEG C; in step two, chloromethane is used to dilute the reaction liquid, then the organic solvent is removed by rotary evaporation, and the remaining product is separated and purified by column chromatography to obtain difluorocyclobutenedione; only two steps are needed to effectively synthesize difluorocyclobutenedione, the reaction flow is simple, the operation is convenient, the whole reaction temperature range is controlled in 80-100 DEG C, the reaction does not need high-temperature reaction conditions, the reaction energy consumption is low, the reaction cost is reduced, and energy saving and environmental protection are promoted.

The invention discloses a preparation method of bromodiphenylmethane, and belongs to the technical field of organic synthesis.The preparation method comprises the steps that methylbenzene, hydrobromic acid and benzhydrol are mixed, then sodium bromide is added, then heating reflux reaction, standing liquid separation and refined petroleum ether treatment are conducted, cooling crystallization is conducted, and bromodiphenylmethane is obtained. The invention provides a preparation method of diphenylbromomethane, which is stable in process, safe to operate, environment-friendly and economical in cost. The method successfully solves the common problems of poor atom economy, low reaction selectivity, complicated post-treatment, difficulty in product purification and the like in the traditional bromination process by optimizing the raw material ratio and synergistic effect, accurately controlling the reaction process and adopting an original efficient purification process. The whole process from reaction to purification is optimized, and the method is particularly suitable for industrial production and has remarkable comprehensive benefits.

This invention discloses a method and system for determining volatile halogenated hydrocarbons in dissolved gases of seawater, belonging to the field of analytical chemistry. The method employs direct gas injection combined with a six-way valve switching injection system, enabling the direct and simultaneous determination of seven volatile halogenated hydrocarbons in seawater: chloroform, carbon tetrachloride, trichloroethylene, bromodichloromethane, tetrachloroethylene, dibromochloromethane, and tribromomethane. This eliminates the need for organic solvents and complex pretreatment, filling a technological gap in this field. Validation shows a detection limit of 0.1–1.1 nmol / mol, a retention time RSD ≤ 0.20%, a concentration RSD ≤ 4.93%, and a relative error between -2.01% and 1.56%. The method exhibits advantages such as high sensitivity, good stability, simple operation, and environmental friendliness, and can be directly applied to fields such as marine environmental monitoring and seabed oil and gas resource exploration.

The application discloses a numerical simulation calculation method for a release process of trifluoro monobromomethane extinguishing agent, and belongs to the field of fire safety. Through AMESim simulation software, a one-dimensional simulation model covering gas storage, pipe network and spraying system is built by calling multiple professional libraries in a sketch mode, and the storage and transmission of the extinguishing agent are simulated in detail. In a submodel mode, reasonable mathematical models, such as two-phase flow models, are selected for elements, and relevant calculation models are determined. In a parameter mode, actual parameters of each element are set, including related parameters of the extinguishing agent and the environment. Finally, calculation is performed in a simulation mode, and indexes such as release time and nozzle pressure are obtained by analyzing the results, so that the functionality of the extinguishing system is evaluated, a basis is provided for system optimization, many problems of traditional simulation methods are solved, and the method has great significance for design and optimization of the extinguishing system.

The invention discloses a method for preparing trimethylaluminum through reaction of triethylaluminum and chloromethane, which comprises the following steps of: efficiently catalyzing the reaction of chloromethane and triethylaluminum through high-pressure liquid phase reaction by using cheap and easily available chloromethane as a methylation reagent and triethylaluminum as a raw material and using a composite catalyst consisting of halide of metal bismuth and halide of metal zinc; the reaction temperature is higher than 120 DEG C, and the yield of the trimethylaluminum is higher than 80% and is higher than that of the existing process for preparing the trimethylaluminum by an alkyl exchange method; meanwhile, cheap and easily available chloromethane is used as a methylation reagent instead of expensive bromomethane or iodomethane, and the yield is higher than that of an existing process using bromomethane, so that the process cost is greatly reduced, and the method is green and low-carbon. Meanwhile, the used catalyst can be recycled, and the method for preparing the trimethylaluminum is low in cost, green, rapid and good in industrialization prospect.

The invention provides a process for reducing the content of bromofluoromethane in a fluticasone furoate bulk drug, and relates to the technical field of biological medicine and separation and purification processes, and the process comprises the following steps: adding pure water into an original solution, oscillating and mixing, and standing for layering; separating an organic phase; concentrating the extracted solution to a semi-solid state, adding a crystallization solvent, and cooling; the wet crystals are placed in vacuum drying and purifying equipment, and the temperature in a drying tank is increased; according to the invention, the power assembly drives the external drying tank to rotate, so that the internal solution can be in direct contact with the inner wall of the drying tank in a larger area, and along with the rotation of the drying tank, the solution at the bottom layer is partially adhered and lifted to form a thinner state; the volatilization process is accelerated, the volatilization and purification efficiency is improved, the volatilization uniformity is improved, and the caking phenomenon of the generated medicine powder part can be reduced.

The present application belongs to trimethylsulfoxonium bromide production technical field, specifically relates to a tail gas treatment device for trimethylsulfoxonium bromide production, the gas buffer tank in tail gas buffer mechanism is connected with tail gas inlet pipe in one side middle part, the upper surface middle part of gas buffer tank is connected with tail gas purification mechanism through gas pipe, one side of tail gas purification mechanism is connected with exhaust main pipe, the other end of exhaust main pipe is connected with exhaust branch pipe I and exhaust branch pipe II through tee pipe, the other end of exhaust branch pipe I and exhaust branch pipe II is connected with tail gas reaction tower I and tail gas reaction tower II in tail gas utilization mechanism respectively, the lower surface of tail gas reaction tower I and tail gas reaction tower II is connected with reaction liquid storage tank I and reaction liquid storage tank II respectively, reaction liquid storage tank I and reaction liquid storage tank II are connected with tail gas reaction tower I and tail gas reaction tower II through heat tracing pipe I and heat tracing pipe II respectively.The device carries out purification treatment to tail gas, and reuses the purified bromomethane gas, reduces production cost, improves production safety.

The invention relates to a preparation method of pyridostigmine bromide. The preparation method comprises the following steps: reacting 3-(N, N-dimethyl carbamoyloxy) pyridine (formula II) with a methylation reagent methyl methanesulfonate or methyl p-toluenesulfonate to generate 3-[(dimethyl carbamoyloxy)-1-methylpyridinium mesylate or 3-[(dimethyl carbamoyloxy)-1-methylpyridinium p-toluenesulfonate (formula III); and dissolving the formula III in acetonitrile, adding lithium bromide for reaction, filtering to remove the precipitated lithium salt, concentrating the filtrate, and purifying in any form to obtain pyridostigmine bromide. According to the preparation method of pyridostigmine bromide provided by the invention, the use of a high-toxicity ozone consuming substance-bromomethane is avoided, and the method is simple in process operation, safe and environment-friendly, low in requirements on plants and equipment, high in product purity and low in production cost, and has obvious industrialization and commercialization advantages. .

The utility model relates to the technical field of gas recycling devices, in particular to a bromomethane fumigation gas recycling device which comprises a first high-temperature-resistant and high-pressure-resistant gas guide pipe, a second high-temperature-resistant and high-pressure-resistant gas guide pipe, a first valve, a filter, a second valve, a sucking pump, a condenser, a snake-shaped buffer pipe, an adsorption tank, a layering box and a storage steel cylinder, the two ends of the first high-temperature-resistant and high-pressure-resistant gas-guide tube are connected with a fumigation chamber and an adsorption tank respectively, a condenser is arranged on the side, away from the first high-temperature-resistant and high-pressure-resistant gas-guide tube, of the adsorption tank, and the condenser is connected with the adsorption tank through a second high-temperature-resistant and high-pressure-resistant gas-guide tube provided with a second valve and a sucking pump; a layering box is arranged on the side, away from the adsorption tank, of the condenser, the layering box is connected with the condenser through a snake-shaped buffer pipe, and after the bromomethane gas is used for fumigating cargoes in the container, the bromomethane gas remaining in the fumigating space can be recycled and reused.

This invention relates to a catalyst and method for the catalytic purification of terephthalic acid waste gas. The catalyst is primarily composed of titanium-aluminum composite oxides with good resistance to halogen poisoning. It is obtained by introducing Ce, which has excellent oxygen storage properties, into the amorphous titanium-aluminum composite oxide unit cells, and loading it with the highly active noble metal Pt and the dehalogenating agent Mn. This catalyst exhibits good catalytic oxidation activity for typical methyl acetate, benzene, and bromomethane in terephthalic acid waste gas, demonstrates relatively stable catalytic purification capacity for bromomethane, has low polybrominated byproducts, high selectivity for carbon dioxide, and is resistant to temperature and humidity, making it highly valuable for industrial applications.

The present invention relates to a process for converting carbon dioxide into carbon monoxide using in situ generated carbon comprising the step of reacting a starting composition containing carbon dioxide and dibromomethane in a reactor at a temperature of 900 to 2,000°C so as to produce a carbon monoxide and hydrogen bromide containing gaseous reaction mixture.