21 results about "Methyl iodide" patented technology

The present application relates to a kind of preparation method of trifluoromethyl pyrazole compound, belong to the technical field of organic synthesis.The specific method is: (1) trifluoroacetyl ethyl acetate is first with hydrazine hydrate cyclization reaction and generates compound of formula III;(2) under the catalysis of base, compound of formula III is reacted with difluoromethylation reagent and generates compound of formula II;(3) compound of formula II is reacted with methylating agent and obtains compound of formula I;The difluoromethylation reagent is difluoro-monochloromethane or sodium difluoro-monochloroacetate;The methylating agent is chloromethane, bromomethane, iodomethane, dimethyl sulfate or dimethyl carbonate.The present application is prepared by changing reaction route, and the higher-priced raw material methylhydrazine is replaced, and isomer impurity is no longer generated in the product prepared.Not only raw material cost is reduced, but also the purity of product is improved.

This invention relates to a 1,1,2,2-tetrahydroperfluoroalkyl-substituted allyl quaternary ammonium salt, its preparation method, and its application, belonging to the field of flocculation treatment technology for high-salt industrial wastewater from natural gas purification. To address the problem that the synthesis of cationic polymer flocculants in existing technologies requires large amounts of surfactants and involves complex operations, this application employs a substitution reaction between 1,1,2,2-tetrahydroperfluoroalkyl iodide and N-methylallylamine; iodomethane is then reacted with the substitution reaction product to undergo quaternization, yielding a 1,1,2,2-tetrahydroperfluoroalkyl-substituted allyl quaternary ammonium salt; the 1,1,2,2-tetrahydroperfluoroalkyl-substituted allyl quaternary ammonium salt is polymerized with acrylamide to obtain a novel cationic polyacrylamide flocculant. The synthesis of cationic fluorocarbon-modified hydrophobic associative polyacrylamide flocculants using an aqueous solution polymerization method is simple, requires no surfactants, and experiments show that the prepared flocculant exhibits excellent flocculation performance.

The application relates to the field of adsorption separation, in particular to a novel ion type bipyridyl group COF material and a preparation method and application thereof. The preparation method comprises the following steps: mixing 2,2',6,6'-tetramethyl-4,4'-bipyridine, 2,2'-bipyridine-5,5'-diformaldehyde, sodium hydroxide, trimethylbenzene and methanol to carry out reaction 1, and COF-CQWU-2 is obtained; the COF-CQWU-2 is placed in a mixed solution of iodomethane and chloroform to carry out reaction 2, and the novel ion type bipyridyl group COF material is obtained. The application successfully designs and prepares a novel ion type bipyridyl group COF material I@COF-CQWU-2 for removing perfluorinated compounds in water, the COF material has the advantages of simple preparation method, high adsorption capacity and recyclability, and the target of selectively adsorbing perfluorinated compounds from water is achieved.

The present invention relates to the field of reducing methane emissions from ruminants. In particular, the present invention relates to administering to a ruminant diiodomethane in an amount of at least 0.5 g diiodomethane per animal per day for reducing methane production resulting from digestive activities of said ruminant.

The present invention relates to a method for recovering unreacted iodine using an unreacted iodine recovery device comprising: a gas quenching device comprising a hollow cooling body into which a reaction gas mixture containing iodine (I2) discharged from a trifluoroiodmethane (CF3I) manufacturing process by the reaction of trifluoromethane (CF3H) and iodine (I2) is supplied to one side of the upper portion, and a first injection unit into which cooling water is sprayed from the upper portion of the cooling body; and a filtration device comprising a hollow filtration body having a filter with a plurality of through holes formed in the lower portion of the gas quenching device, and a second injection unit into which cleaning water is sprayed from the upper portion. A cooling step in which a high-temperature reaction gas mixture is supplied to the above-mentioned cooling body and cooling water is sprayed from the first injection part to cool the reaction gas mixture and gaseous iodine (I2) is precipitated, and The above aqueous solution and solid iodine (I2) flow into a filtration device and undergo a filtration step in which the aqueous solution and iodine (I2) are separated by a filter, and The present invention relates to a method for recovering unreacted iodine, characterized in that the iodine (I2) filtered by the above filter is cleaned by spraying cleaning water from a second spraying unit.

This invention provides a multi-backbone copolymerized polyaryl anion exchange membrane, its preparation method, and its applications. The preparation method of the multi-backbone copolymerized polyaryl anion exchange membrane includes: polycondensing an aromatic compound, N-methylpiperidinone, and 3-quinine cycloketone hydrochloride under a strong acid catalysis to obtain a polymer intermediate; then, quaternizing the polymer intermediate with terminal halogenated perfluorinated long-chain alkanes and iodomethane to introduce hydrophobic side chains, obtaining membrane powder; finally, dissolving and coating the membrane powder to form a membrane. This invention effectively improves the polymer molecular weight and main chain alkali resistance by introducing 3-quinine cycloketone into the copolymerization process; simultaneously, by introducing hydrophobic side chains of perfluorinated alkanes, a hydrophilic-hydrophobic phase separation structure is constructed, forming an effective ion transport channel. The resulting multi-backbone copolymerized polyaryl anion exchange membrane has advantages such as low swelling ratio, high mechanical strength, high chemical stability, strong alkali resistance, and low membrane resistance, and can be widely used in fields such as water electrolysis for hydrogen production.

The application discloses a tetraphenylstyryl-imidazole pyrazine derivative with AIE properties and application, and has the following structure: 4-(1,2,2-triphenylvinyl) benzaldehyde, 5,6-diaminopyrazine-2,3-dicyan, sodium bisulfite are placed in N,N-dimethylformamide, and are reacted at 150 DEG C for 12h; after reaction, the functional organic material C-1 is obtained through separation and purification. The obtained product C-1, methyl iodide and N,N-diisopropylethylamine are placed in N,N-dimethylformamide, and are reacted at 90 DEG C for 1-2h; after reaction, a tetraphenylstyryl-imidazole pyrazine derivative with AIE properties is obtained. The functional organic material disclosed by the application has the advantages of low preparation cost, simple operation, simple method, and the material shows significant AIE characteristics, and can be applied to technical fields of luminescent materials and inkless writing.

The application discloses a preparation method of a bismuth-based gamma-Al2O3-silica material, which comprises the following steps: adding nitric acid into water to obtain a nitric acid aqueous solution; adding pseudo-boehmite into the nitric acid aqueous solution and stirring to obtain sol I; adding silica into the sol I and stirring to obtain sol II; calcining the sol II under air condition to obtain gamma-Al2O3-silica; and mixing the gamma-Al2O3-silica with bismuth powder through mechanical mixing to obtain the bismuth-based gamma-Al2O3-silica material. The bismuth-based gamma-Al2O3-silica material has the advantages of low cost, simple synthesis and easy industrialization. The bismuth-based gamma-Al2O3-silica material prepared by the application has high adsorption capacity for iodine and methyl iodine simultaneously through simple mechanical mixing, and has a good industrial application prospect.

An electrochromic material and a method for preparing the anodic electrochromic material thereof. The anodic electrochromic material used in the electrochromic material is bis(dimethyldihydrophenazinyl) ether. The steps are as follows: preparing a prepolymer solution; adding the cathodic electrochromic material; adding the anodic electrochromic material, and stirring until homogeneous. The method for preparing the anodic color-changing material involves preparing a moistened 2,2'-oxobis(5,10-dihydrophenazine) from 4,4'-oxobis(1,2-phenylenediamine) and catechol. The moistened 2,2'-oxobis(5,10-dihydrophenazine) is then added to acetonitrile, sodium dithionite, sodium carbonate, methyl iodide, and methyltributylammonium chloride to obtain a crude 2,2'-oxobis(5,10-dimethyl-5,10-dihydrophenazine). The crude 2,2'-oxobis(5,10-dimethyl-5,10-dihydrophenazine) is then added to toluene and ethanol to prepare a bis(dimethyldihydrophenazinyl) ether. The advantages of this invention are that it saves on the use of anodic electrochromic materials, reduces costs, and better meets color requirements.

The application discloses a preparation method of a bismuth silicate adsorption material and application of the bismuth silicate adsorption material in methyl iodide adsorption, and comprises the following steps: dissolving Bi(NO3)3.5H2O in ethylene glycol, stirring until completely dissolved to obtain solution A; dissolving Na2SiO3.9H2O in deionized water, stirring until completely dissolved to obtain solution B; adding the solution B into the solution A drop by drop, continuously stirring, adjusting pH to obtain a reaction solution; transferring the reaction solution into a hydrothermal reaction kettle, heating and keeping warm, naturally cooling to room temperature, and then filtering, washing and drying to obtain the bismuth silicate adsorption material, namely Bi2O2SiO3. The prepared bismuth silicate adsorption material Bi2O2SiO3 has excellent methyl iodide adsorption performance, the adsorption amount of the bismuth silicate adsorption material to methyl iodide reaches 1426 mg / g, and the bismuth silicate adsorption material can form stable BiI3 after adsorbing CH3I, so that secondary pollution is effectively avoided; in addition, the preparation method is simple, the production cost is low, and the bismuth silicate adsorption material is easy to mass-produce.

This invention discloses a method for preparing dimethyl tellurium. The method includes the following steps: slowly adding a dimethyl ether solution dropwise into a boron triiodide solution; washing and drying the reaction mixture to obtain an organic phase; adding the organic phase dropwise into a mixture of disodium telluride and an alcohol reagent; separating the reaction product by distillation; and purifying the reaction product to obtain dimethyl tellurium. This invention uses low-toxicity, inexpensive dimethyl ether instead of highly toxic dimethyl sulfate or expensive iodomethane, fundamentally solving the raw material safety bottleneck and significantly reducing production costs. The synthetic route using dimethyl ether, boron triiodide, and disodium telluride as the main raw materials significantly reduces byproducts and impurities in the direct product, simplifies subsequent purification steps, and allows for the acquisition of high-purity dimethyl tellurium through simple distillation, effectively improving the yield and purity of the final product and showing good prospects for industrial application.

This invention discloses a method for the synergistic catalytic carbonylation of furfuryl alcohol to FDCA using rhodium and iodide ligands, relating to the field of FDCA synthesis technology. Using rhodium dicarbonyl chloride dimer ([Rh(CO)₂Cl]₂) as the main catalyst, iodomethane (CH₃I) as the co-catalyst, and triphenylphosphine (PPh₃) as the ligand, the method achieves efficient carbonylation of furfuryl alcohol in an acetic acid-water mixed solvent at 180-200°C and 4-6 MPa carbon monoxide pressure. Through synergistic design of the catalytic system and optimization of process conditions, highly efficient conversion of furfuryl alcohol and highly selective generation to FDCA are achieved. The furfuryl alcohol conversion rate can reach over 95%, and the FDCA selectivity can reach over 93%, significantly superior to traditional rhodium catalytic systems, reducing the generation of byproducts and the burden of subsequent purification.

This invention discloses a method for producing trifluoroiodomethane (CF3I), the method comprising: providing a feedstock containing trifluoroacetyl iodide (TFAI); passing the feedstock through at least one tower loaded with carbon-containing material to remove hydrogen iodide (HI), hydrogen triiodide (HI3), and iodine (I2) from the feedstock; and providing the feedstock to a reactor to produce a trifluoroiodomethane product stream. Another method for producing trifluoroiodomethane (CF3I) comprises: providing a feedstock containing trifluoroacetyl iodide (TFAI) to a reactor to produce a trifluoroiodomethane product stream; and passing the trifluoroiodomethane product stream from the reactor through at least one tower loaded with carbon-containing material to remove hydrogen iodide (HI), hydrogen triiodide (HI3), and iodine (I2) from the trifluoroiodomethane product stream.

The present invention relates to the technical field of preparing acetic acid from methanol through low-pressure carbonylation and discloses a method for preparing acetic acid from methanol via low-pressure carbonylation with high catalyst stability, comprising the following steps: S1, in a reaction stage: introducing methanol or a reactive derivative thereof and CO into a reactor, adding a catalyst comprising a Group VIII metal, an iodomethane co-catalyst, an inorganic iodide, and an ionic liquid having an [NR1R2R3R4]+[CH3COO]- structure as a catalyst stabilizer, and enabling these materials to undergo a carbonylation reaction in the reactor to obtain a crude acetic acid product, wherein R1, R2, R3, and R4 are an alkyl group containing 4-9 carbons, an aryl group, an acyl group, or a combination thereof; S2, performing gas-liquid separation; S3, performing evaporation washing; S4, performing light removal treatment; and S5, performing purification treatment, so that when the reactants are in a reaction system having a low water content of 0.5-1.0%, the catalyst comprising the Group VIII metal remains stable, thereby reducing the energy consumption for a rear-end dehydration tower and a finished product tower and reducing production costs.

This invention discloses a method for removing impurities such as sulfur dioxide (SO2) from trifluoroacetyl chloride (TFAC) by distillation, adsorption, or a combination thereof, and / or by forming an azeotropic or azeotropic composition comprising effective amounts of sulfur dioxide (SO2) and trifluoroacetyl chloride (TFAC). The thus purified trifluoroacetyl chloride (TFAC) can then be used to prepare trifluoroiodomethane (CF3I). Azeotropic and azeotropic compositions of sulfur dioxide (SO2) and trifluoroacetyl chloride (TFAC) are also disclosed.

The present invention relates to the technical field of synthesis of acetic acid by means of methanol low-pressure carbonylation. Disclosed is a catalyst system for synthesizing acetic acid by means of methanol low-pressure carbonylation. The catalyst system comprises a group VIII metal main catalyst, an iodomethane cocatalyst, an inorganic iodide and an ionic liquid containing [NR1R2R3R4]+[CH3COO]- as a catalyst stabilizer, wherein R1, R2, R3 and R4 in the ionic liquid are an alkyl containing 4-9 carbons, an aryl and an acyl or a combination thereof. When the catalyst system is applied to a process for synthesizing acetic acid by means of methanol low-pressure carbonylation, a metal catalyst can be kept stable under the condition of a low water content, thereby reducing the separation energy consumption of a subsequent rectification system.

The application discloses a recovery system and recovery method for iodine in trifluoroiodomethane production, and the recovery system comprises a heating device, a condensing device, an alkali washing device and a washing device, wherein the heating device is provided with a gas inlet for receiving trifluoroiodomethane production tail gas; the condensing device is communicated with the heating device; the alkali washing device is communicated with the heating device; the washing device is communicated with the condensing device and the alkali washing device; a pipeline assembly comprises a liquid-phase pipeline and a gas-phase pipeline, the liquid-phase pipeline is communicated with the bottom of the heating device and the condensing device, and the gas-phase pipeline is communicated with the top of the heating device and the alkali washing device; a switching assembly comprises a first switching piece and a second switching piece, the first switching piece is arranged on the gas-phase pipeline to open or close the gas-phase pipeline, and the second switching piece is arranged on the liquid-phase pipeline to open or close the liquid-phase pipeline. The alkali washing device is used for removing HF in the tail gas, the condensing device is used for recovering iodine, and the washing device is used for removing trace iodine vapor, so that the iodine can be recovered, the consumption of iodine is greatly reduced, and the operation is simple and good in effect.

A method of producing trifluoroiodomethane (CF3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI), passing the feedstock through at least one column loaded with a carbon-containing material to remove hydrogen iodide (HI), hydrogen triiodide (HI3), and iodine (I2) from the feedstock, and providing the feedstock to a reactor to produce a trifluoroiodomethane product stream. Another method of producing trifluoroiodomethane (CF3I) includes providing a feedstock comprising trifluoroacetyl iodide (TFAI) to a reactor to produce a trifluoroiodomethane product stream, and passing the trifluoroiodomethane product stream from the reactor through at least one column loaded with a carbon-containing material to remove hydrogen iodide (HI), hydrogen triiodide (HI3), and iodine (I2) from the trifluoroiodomethane product stream.

An electrochromic composition and a method for preparing the anodic electrochromic material thereof. The anodic electrochromic material used in the electrochromic composition is bis(dimethyldihydrophenazinyl)amine. The steps are as follows: preparing a prepolymer solution; adding a cathodic electrochromic material; adding an anodic electrochromic material, and stirring until homogeneous. The method for preparing the anodic color-changing material involves generating a moistened bis(5,10-dihydrophenazin-2-yl)amine from N⁴-(3,4-diaminophenyl)-1,2,4-phenyltriamine and catechol. The moistened bis(5,10-dihydrophenazin-2-yl)amine is then added to acetonitrile, sodium dithionite, sodium carbonate, methyl iodide, and methyltributylammonium chloride to obtain crude N,N-bis(5,10-dimethyl-5,10-dihydrophenazin-2-yl)amine. The crude N,N-bis(5,10-dimethyl-5,10-dihydrophenazin-2-yl)amine is then added to toluene and ethanol to prepare bis(dimethyldihydrophenazinyl)amine. The advantages of this invention are: it saves on the use of anodic electrochromic materials, reduces costs, and better meets color requirements.

This invention relates to a method for preparing 2-(methylsulfonyl)nicotinaldehyde, belonging to the field of organic synthesis technology. The invention includes the following steps: Under a protective atmosphere, 2-mercaptonicotinic acid and potassium carbonate are dissolved in an organic solvent, and iodomethane is added to react, yielding a white solid methyl 2-methylthionicotinic acid ester; the obtained methyl 2-methylthionicotinic acid ester is dissolved in acetic acid with sodium tungstate hydrate, and an oxidizing agent is added at -5℃ to 5℃, the reaction is carried out at room temperature, and the product is collected to obtain a white solid methyl 2-(methylsulfonyl)nicotinic acid ester; Under a protective atmosphere, the obtained methyl 2-(methylsulfonyl)nicotinic acid ester is dissolved in tetrahydrofuran, and a reducing agent is added and stirred to react at -83℃ to -73℃, after the reaction is completed, the product is collected to obtain 2-(methylsulfonyl)nicotinaldehyde. The purity of the 2-(methylsulfonyl)nicotinaldehyde obtained by this invention is 97%-99%, and the overall yield is above 70%.

This description provides a process for producing trifluoroiodomethane (CF3I). The process includes supplying vapor-phase reactants, including trifluoroacetyl halide, hydrogen, and iodine; heating the vapor-phase reactants; and reacting the heated vapor-phase reactants in the presence of a catalyst to produce trifluoroiodomethane. The catalyst is a transition metal.