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 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 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 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 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 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 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 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 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.