66 results about "METHYLIODIDA" patented technology

A process for stably producing high-purity acetic acid while efficiently removing acetaldehyde is provided.

The process for producing acetic acid comprises a reaction step for allowing methanol to react with carbon monoxide in the presence of a metal catalyst, a halide salt, and methyl iodide; a step for continuously feeding a flasher with the reaction mixture and separating a lower boiling point component (2A) containing acetic acid and methyl iodide and a higher boiling point component (2B) containing the metal catalyst and the halide salt; a step for feeding a distillation column with the lower boiling point component (2A), and separating a lower boiling point component (3A) containing methyl iodide and acetaldehyde and a stream (3B) containing acetic acid to collect acetic acid; a condensation step for condensing and temporarily holding the lower boiling point component (3A) in a decanter and discharging the lower boiling point component (3A) from the decanter; and a step for separating the lower boiling point component (3A) discharged from the decanter into acetaldehyde and a liquid residue and recycling the liquid residue to the reaction system. In the condensation step, the amount of the lower boiling point component (3A) to be held is controlled based on a fluctuating flow rate of the lower boiling point component (3A) to be fed to the decanter.

The invention discloses a preparation method and application of a polyethyleneimine modified original ecological positively charged nanofiltration membrane. The preparation method is carried out according to the following steps: (1) using an ultrafiltration membrane as a support membrane, a piperazine and diaminodipropylamine mixed aqueous solution as an aqueous phase and a trimesoyl chloride n-hexane solution as an organic phase to form an active separation layer on the support membrane by interfacial polymerization to obtain an original ecological polyethyleneimine nanofiltration membrane; (2) mixedly dissolving active agent 2-chloro-1-methyliodopyridine, sodium hydroxide and polyethyleneimine in deionized water to obtain a grafted aqueous solution; and (3) pouring the grafted aqueous solution into the surface of the original ecological polyethyleneimine nanofiltration membrane obtained in the step (1) for grafting reaction, then removing excess surface solution, washing with water,and drying to obtain the positively charged nanofiltration membrane. The application of the polyethyleneimine modified original ecological positively charged nanofiltration membrane in removal of dyes, toxic metal ions and monovalent and divalent cations can be provided, and the polyethyleneimine modified original ecological positively charged nanofiltration membrane has good rejection rate and stability.

(Object): There are provided (1) an optically active a-amino acid derivative, a stereoselectively useful intermediate for the synthesis of pharmaceutical or agrochemical products, which derivative is an optically active quaternary ammonium salt that, when used as an axially chiral spiro phase-transfer catalyst in the asymmetric alkylation of a glycine derivative, gives a high stereoselectivity toward substrates having a small molecule such as methyl iodide, or secondary alkyl halides, and a method for producing the same; and (2) a novel optically active quaternary ammonium salt that is a high performance axially chiral spiro phase-transfer catalyst used in the asymmetric alkylation of a glycine derivative, and in which each ring of the spiro-structure has the same structure that is advantageous in terms of the number of steps involved in the synthesis of the catalyst, and a method for producing the same and a method for recovering the same. (Solving means): To achieve the objects, (1) an axially chiral spiro-ammonium salt that incorporates an alkyl- or aryl-substituted silyl group as a substituent on the aromatic ring is used as a phase-transfer catalyst in the asymmetric alkylation of a glycine derivative, and (2) an axially chiral spiro-ammonium slat that incorporates a substituent encompassing a perfluoro alkyl group is used in the asymmetric alkylation of a glycine derivative and thereafter is recovered using a fluorous solvent.

The invention relates to a detection and analysis method of phytosterol. Firstly, the phytosterol is derivatized by using a derivatization reagent-4'-carboxyl rhodamine, and an ultra-high performance liquid chromatography triple quadrupole tandem mass spectrometry with a multi-reaction monitoring mode is used for carrying out qualitative and quantitative detection and analysis in the method. The method comprises the following steps: firstly, extracting the phytosterol by utilizing an ultrasonic assistance-dispersive liquid-liquid microextraction technique, then adding a 4'-carboxyl rhodamine acetonitrile solution, a 2-chlorine-1-methyl iodine pyridine acetonitrile solution and a 4-dimethyl aminopyridine acetonitrile solution into an obtained phytosterol extract for derivatization reaction, and finally analyzing and detecting by an ultra-high performance liquid chromatography triple quadrupole tandem mass spectrometry system. The method is moderate, rapid, and high in sensitivity, and has the important significance on the quality control of vegetable oil, beverages and medicinal materials which are rich in phytosterol.

The invention discloses a magnesium borate crystal whisker super induced biomaterial and preparation method thereof, the biomaterial uses polypropylene, poly glycolic acid, and methyl benzoate as the main component, through adding poly-3-hydroxybutyric acid, trihydroxymethyl aminomethane, 2-thiol benzimidazole, di-amino-maleic acid, elhylene diamine tetraacetic acid, dodecyl trimethyl ammonium iodide, epoxidized soybean oil, naphthylacetic acid sodium, magnesium borate whisker, montmorillonite powder, light mass calcium carbonate, dispersant, and stabilizer, supplemented with mixing and stirring, high temperature sintering, crushing, high pressure calcinations, acid soaking, ultrasound dispersing, screw rod extruding, injection treatment and other processes, is prepared fully. The biomaterial super induced with magnesium borate crystal whisker has high low temperature shock resistance ability and high anti-aging property, can satisfy the requirements of each branch, and has relatively good application prospect.

The invention relates to a method for preparing a perovskite solar cell with high short-circuit current and high conversion efficiency, and a product, and belongs to the technical field of photovoltaics. The method comprises the following steps: firstly, a layer of methyl iodide amine is spin-coated on a hole transport layer; and then a hot precursor solution of MAPbI3-xClx is spin-coated on the methyl iodide amine layer; when the hot MAPbI3-xClx precursor solution is dropped onto the methyl iodide layer, the spin-coated methyl iodide layer is dissolved again, so that the concentration of iodine at the interface between the hole transport layer and an MAPbI3-xClx perovskite light absorbing layer is greater than that at other positions of the MAPbI3-xClx perovskite light absorbing layer; after annealing crystallization at the later stage, an iodide ion concentration gradient is formed on the MAPbI3-xClx perovskite layer at the interface between the hole transport layer and the MAPbI3-xClx perovskite light absorbing layer, and such a halogen concentration gradient increases the position of the perovskite conduction band, thereby facilitating the transport of holes, and further increasing the short circuit current and the conversion efficiency. The method is simple and easy to operate, can be directly promoted in large scale in industrial production, and has a potential application value in solar cells.

The invention relates to a 2-(2,4,6-trimethylbenzeneseleno)-5-methylbenzoxazole compound and a preparation method thereof. The preparation method comprises the following steps: with 5-methylbenzoxazole and 2,4,6-trimethylphenyl iodide as reactive raw materials in an organic solvent, and elemental selenium as a selenide reagent, carrying out a cascade reaction under the jointed promotion effect ofa copper catalyst and alkali, thereby obtaining the 2-(2,4,6-trimethylbenzeneseleno)-5-methylbenzoxazole compound. The method is simple in reaction conditions, the product is high in yield and purity,a novel synthetic route and method can be developed for the 2-(2,4,6-trimethylbenzeneseleno)-5-methylbenzoxazole compound, and the compound has excellent application potential and research value.

The invention relates to on-line measurement equipment for evaluating efficiency of an iodine absorber by non-radioactive methyl iodide. The on-line measurement equipment comprises an experiment reagent import assembly and an experiment reagent export assembly, wherein the experiment reagent import assembly is connected with an air inlet end of the iodine absorber, the experiment reagent export assembly is connected with an air outlet end of the iodine absorber, the experiment reagent import assembly comprises an experiment reagent import pipe, the experiment reagent import pipe is connected with an upstream acquisition pipe and an experiment reagent injection pipe, the experiment reagent export assembly comprises an experiment reagent export pipe, the experiment reagent export pipe is connected with the air outlet end of the iodine absorber, the experiment reagent export pipe is connected with a downstream acquisition pipe, the experiment reagent injection pipe is connected with an impulse-type methyl iodide gas generator, and the upstream acquisition pipe and the downstream acquisition pipe both are connected with a PID gas detector. In the on-line measurement equipment, the non-radioactive methyl iodide is used as an experiment reagent to perform efficiency test on the iodine absorber, the radioactive operation in efficiency experiment of the iodine absorber is prevented, anoperation risk is reduced, and the situation that radioactive gas is discharged caused by absorption efficiency disqualification of the iodine absorber or operation mistake during the experiment process is eliminated.

The invention aims to provide a dynamic distribution system of gaseous methyl iodine. The dynamic distribution system comprises a small-flow liquid supply device, a liquid vaporization chamber and an air compressor, wherein the small-flow liquid supply device is fixed on a bracket; an outlet of the small-flow liquid supply device is arranged in alignment with an inlet of the liquid vaporization chamber; the liquid vaporization chamber is arranged on a pedestal through a threaded supporting rod and a lifting threaded bushing which is matched with the threaded supporting rod; the angle of the liquid vaporization chamber can be adjusted through the lifting threaded bushing; an air suction port is formed below the liquid vaporization chamber; a hole which is connected with the air compressor is formed above the liquid vaporization chamber; an electric heating device is also arranged in the liquid vaporization chamber; and the air compressor is communicated with a gas application environment. According to the dynamic distribution system, long-time continuous stable supply of the small-flow methyl iodine liquid can be realized, and stable concentration of the methyl iodine at the outlet of the system is guaranteed. The suction effect of the air compressor enables that the liquid vaporization chamber is in a negative pressure state all the time; safety and reliability are guaranteed; and no injury is caused to the environment and the operation personnel. The system has the advantages of simple structure, reliable performance and easiness for implementation.

The invention provides a non-radioactive method and device for measuring the purification efficiency of an iodine adsorber, and the method comprises the steps: S1, a sucking pump is started to exhaust air, so that the air volume, temperature and humidity meet the detection requirements; S2, a tracer injection unit injects a non-radioactive isotope mixture gas of methyl iodide and air as a tracer; S3, a measuring probe emits laser with specific energy to break molecular bonds of corresponding energy of the non-radioactive methyl iodide gas molecules, positive and negative ions are separated out, and the concentration value of methyl iodide ions in the tracer agent is obtained by measuring current generated by ions in a potential field; and S4, the purification efficiency of the iodine adsorber is judged according to the concentration accumulated value of the methyl iodide ions in the upstream and downstream tracers. The radioactive risk in the process of non-radioactive measurement of the purification efficiency of the iodine adsorber is eliminated, and the engineering application requirement of efficiency measurement of the iodine adsorber is met.

The invention relates to a tulathromycin synthesis method. The method comprises the steps of (1) carrying out a reaction on norazithromycin and Fmoc-Cl under the action of an acid-binding agent to selectively prepare a 2'-Fmoc-norazithromycin intermediate; (2) oxidizing a C-cyclic alcohol hydroxyl group of the 2'-Fmoc-norazithromycin intermediate by utilizing a Swern oxidation reaction, so as to prepare a 4''-oxo-2'-Fmoc-norazithromycin intermediate; (3) under the action of strong base, enabling trimethylsulfur iodide to react with the 4''-oxo-2'-Fmoc-norazithromycin intermediate, so as to prepare a 4''-methyleneepoxy-2'-Fmoc-norazithromycin intermediate; and (4) under the condition of an organic solvent, enabling the 4''-methyleneepoxy-2'-Fmoc-norazithromycin intermediate to react with n-propylamine, so as to obtain target product tulathromycin. Compared with the prior art, the method has the advantages that the reaction selectivity is high, the monitoring is convenient, the reaction steps are shortened, the problems of production safety and heavy metal residue possibly existing in catalytic hydrogenation by using noble metal are avoided, and the production cost is reduced while the reaction efficiency is improved.

The invention relates to a purification method of radioactive iodomethane-containing gas, which comprises the following steps: (1) under normal pressure, the radioactive iodomethane-containing gas passes through an ozone oxidation chamber at a certain gas flow velocity, and the ozone oxidation chamber is filled with ozone with a certain concentration; (2) introducing the gas flowing out of the ozone oxidation chamber into a sodium hydroxide leaching chamber, and spraying a sodium hydroxide leaching solution into the sodium hydroxide leaching chamber at a certain leaching flow, so that the gas to be treated forms aerosol; and (3) filtering the aerosol formed in the step (2) by using a fiber filter, and discharging the filtered gas into a ventilation system. According to the method, methyl iodide is placed in an ozone environment for an oxidation reaction, aerosol is finally formed through leaching of an alkaline solution, a fiber filter which is relatively easy to treat is used for removing, the purification efficiency is high, and final waste is easy to treat.

The invention relates to a red light aggregation-induced emission material, in particular to an aggregation-induced emission material based on thieno[3,4-b]thiophene as well as a preparation method and application thereof. The preparation method comprises the following steps: by taking triphenylamine and thieno[3,4-b]thiophene as core units, synthesizing (E)-4-(2-(4-(4-(bis(4-methoxyphenyl)amino)phenyl)-2-(ethoxycarbonyl)thieno[3,4-b]thiophene-6-yl)vinyl)-1-methyl pyridinium iodide by using 4-(4-(bis(4-methoxyphenyl)amino)phenyl)-6-methylthieno[3,4-b]thiophene-2-carboxylic acid ethyl ester and 1,4-dimethyl pyridinium iodide; and dissolving the product into acetone, adding an aqueous solution of potassium hexafluorophosphate, and reacting to obtain the material. Fluorescence emission of the material is located in a near-infrared region, and the material is high in fluorescence brightness and can serve as a red light material to be applied to the field of imaging.

The invention relates to the technical field of pesticide compositions, in particular to a herbicide containing halosulfuron-methyl. The active ingredients of the herbicide are the halosulfuron-methyland methyl iodosulfuron, wherein the mass ratio of the halosulfuron-methyl to the methyl iodosulfuron is (2-5): (3-15). The herbicidal activity of the compounded halosulfuron-methyl and methyl iodosulfuron in the herbicide is higher than that of the separately used halosulfuron-methyl and methyl iodosulfuron for broadleaf grass and cyperaceae, and a synergistic effect is achieved; a weed controlspectrum is enlarged after the combination, and the dosage is also reduced; after the halosulfuron-methyl and the methyl iodosulfuron are compounded, the synergistic effect is shown within a certain ratio, the control effect of the composition is obviously improved than single agents, the dosage of a pesticide is reduced, the use frequency of the pesticide is reduced, the use cost of the pesticideis reduced, the adverse effect of the pesticide on the ecological environment is reduced, and the maintenance of the ecological balance is facilitated.