21 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 disclosure relates to a method of ensiling Asparagopsis sp., the method comprising the steps of (a) providing Asparagopsis sp. having a moisture content of between 60 and 94 wt%; (b) adding an ensiling agent comprising an organic acid having 1 to 7 carbon atoms or a salt of an organic acid having 1 to 7 carbon atoms; (c) mixing said Asparagopsis sp. with the ensiling agent thereby providing a mixture; and (d) storing the mixture from step (c) under dark and anaerobic conditions for a time period sufficient to reduce the pH of the mixture to 4 or less. The present disclosure also relates to ensiled Asparagopsis sp. comprising bromoform in an amount of between 0.3 to 7 wt%, based on dry weight, preferably between 1 to 6 wt%, more preferred 2 to 5 wt%. The present disclosure further relates to an anti-methanogenic feed supplement as well as a method of reducing methanogenesis in a ruminant, and the use of ensiled Asparagopsis sp.

The invention provides a method for detecting the residual quantity of bromomethane in grains, and belongs to the technical field of food safety detection. The method comprises the following steps: firstly, grinding a grain sample, and performing cryopreservation to obtain a to-be-detected sample; then enriching bromomethane in a trapping tube by adopting an automatic sample injection purge trapping method; carrying out thermal desorption on the trapping pipe; and finally, detecting by using a gas chromatograph-mass spectrometer. According to the method, the grain sample is ground into powder and then cryopreserved, so that the volatilization of bromomethane can be effectively improved, and trapping is facilitated. The recovery rate of methyl bromide is improved by adjusting the purging temperature and the purging time, and the problem that the detection result is low is prevented.

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 utility model relates to the technical field of fumigation treatment, and discloses an imported container cargo bromomethane quarantine fumigation device which comprises a container, the container is used for bearing a whole, the upper side and the lower side of the container are fixedly connected with connecting seats, and clamping grooves are formed in the connecting seats; the fumigation device comprises a container, the upper side and the lower side of the fumigation device are fixedly connected with connecting blocks, the interiors of the connecting blocks are fixedly connected with limiting columns, the outer walls of the limiting columns are slidably connected with supporting blocks which are symmetrically arranged, the outer wall of the fumigation device is provided with a sealing assembly, and the sealing assembly is used for sealing the fumigation device and the container. According to the fumigation device, the clamping blocks on the upper side and the lower side of the fumigation device are inserted into the clamping grooves in the connecting base, so that the clamping blocks are embedded into the clamping grooves to be connected and locked, the effect of conveniently installing the fumigation device is achieved, and the problems that a container door is large in size, and sealing is inconvenient when the fumigation device is connected to a container through a pipeline are solved; and the convenience of the fumigation device is improved.

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 vaporizer comprises a vaporizing tank, the top end of the vaporizing tank is open, a top cover is fixedly connected to the top end of the vaporizing tank through threads, a rotatable spraying assembly is installed in the middle of the bottom wall of the vaporizing tank, a plurality of electric heating plates are fixed to the side edge of the bottom wall of the vaporizing tank, and the bottom wall of the vaporizing tank is provided with a plurality of spraying nozzles. The adjacent sides of the multiple electric heating plates are jointly provided with a heat conduction assembly in an attached mode, the top end of the heat conduction assembly is detachably and fixedly connected with the top cover, and a chemical feeding assembly communicating with the spraying assembly is installed on the lower surface of the vaporization tank. According to the device, the vaporization tank, the top cover, the spraying assembly, the electric heating plate, the heat conduction assembly and the chemical dosing assembly are arranged, liquid bromomethane can be quickly fed into the vaporization tank through the chemical dosing assembly, and the bromomethane is sprayed to the heat conduction assembly through the spraying assembly so as to realize vaporization; the heating area of methyl bromide can be increased, so that the vaporization efficiency is improved.

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 present invention relates to the technical field of pollutant analysis and identification, and discloses a method for rapidly detecting typical halogenated organic pollutants in aquatic plants. The method provided by the present invention can simultaneously detect a variety of volatile halogenated organic compounds including chloroform, bromodichloromethane, dibromochloromethane, bromoform, dichloroacetaldehyde, trichloroacetaldehyde, dichloroacetonitrile, dibromoacetonitrile and chloropicrin at one time, greatly improving the detection efficiency and providing the possibility for rapid screening and quantitative analysis of complex and diverse halogenated pollutants in plants. The method provided by the present invention is a detection method for volatile halogenated organic pollutants in plants, which is characterized by being simple and quick to operate, having a low detection limit, high sensitivity and excellent linear correlation, and ensuring accurate measurement results.

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.