7 results about "Methoxamine" patented technology

The invention belongs to the technical field of organic synthetic chemistry and pesticide science, and particularly relates to an indole-containing amide derivative as well as a preparation method and application thereof, and the indole-containing amide derivative has a structure as shown in a formula I or a formula II, through an active substructure splicing strategy, indole is used as a parent skeleton, amido bonds are ingeniously introduced for structural diversity optimization and modification, active functional groups such as methoxyamine are further introduced, and a series of indole amide derivatives with novel structures are designed and synthesized. Through determination, the screened series of compounds show good antibacterial activity, and a plurality of compounds show excellent prevention and treatment effects on various important crop diseases.

The utility model relates to a mother liquor recycling device for producing methoxyamine hydrochloride, which comprises a recycling tank and an outer cooling interlayer, and is technically characterized in that a central cooling vertical pipe is supported in the recycling tank by a bearing, and the upper end and the lower end of the central cooling vertical pipe are connected with a second cooling medium outlet and a second cooling medium inlet by an upper rotary joint and a lower rotary joint; an annular scraping assembly is arranged between the recycling tank and the central cooling vertical pipe, the annular scraping assembly is composed of an outer scraping ring, an inner scraping ring, an annular hollowed-out plate connected between the upper edges of the inner scraping ring and the outer scraping ring and a filter screen layer arranged on the annular hollowed-out plate, an electric push rod is fixed to the top face of the recycling tank, and the lower end of a telescopic rod is fixedly connected with the annular hollowed-out plate; a discharging scraper is arranged on the lower portion of the central cooling vertical pipe, a crystal material discharging port is formed in the bottom face of the recycling tank, a liquid outlet is formed in the lower portion of the side wall of the recycling tank, a circulating inlet is formed in the upper portion of the side wall of the recycling tank, the liquid outlet is provided with a circulating branch communicated with the circulating inlet, and a circulating pump is arranged on the circulating branch. The device further improves the recovery efficiency.

The invention discloses a preparation method for preparing methoxyamine hydrochloride by using 2, 3-butanedione, which comprises the following steps: S1, adding 2, 3-butanedione and hydroxylamine hydrochloride into water, and carrying out oximation reaction under the action of alkali to prepare 2, 3-butanedioxime; s2, 2, 3-dimethylglyoxime and dimethyl sulfate are subjected to a methylation reaction, 2, 3-bis (methoxyimino) butane is prepared, and in the reaction process, alkali liquor is adopted to control the pH of a reaction system to be 7-9; s3, the 2, 3-bis (methoxyimino) butane is subjected to an acidolysis reaction, and methoxyamine hydrochloride is prepared. According to the method, 2, 3-butanedione and hydroxylamine hydrochloride are taken as raw materials, so that the conversion rate of methylation reaction is increased, the generation of polymethylation impurities (O, N-dimethyl hydroxylamine hydrochloride) is reduced, the yield is relatively high, meanwhile, the reaction condition is mild, the operation is simple, synthesis is easy, the byproduct 2, 3-butanedione can be recycled, the material utilization rate is high, and the method is suitable for industrial production. And the cost and the energy consumption can be reduced.

The invention discloses a mother liquor tail gas heat recovery device and method in methoxyamine production. The mother liquor tail gas heat recovery device comprises a mother liquor kettle, a waste heat exchanger, an efficient gas-liquid separation tank, a liquid caustic soda temporary storage tank, a liquid caustic soda circulating pump and a distillation kettle, an outlet of the mother liquor kettle is communicated with a gas phase inlet of the waste heat exchanger through a pipeline, a gas phase outlet of the waste heat exchanger is communicated with an inlet of the efficient gas-liquid separation tank through a pipeline, and a gas phase outlet of the efficient gas-liquid separation tank is connected into a tail gas system through a pipeline. According to the process, heat in the mother liquor tail gas can be recycled to the maximum extent, the initial temperature of fed caustic soda liquid can be effectively increased, the amount of steam used in the heating process in the earlier stage of methoxyamine distillation is reduced, a low-temperature gas phase at an outlet of the waste heat exchanger enters the efficient gas-liquid separation tank, liquid drops entrained in the low-temperature gas phase can be effectively recycled, and the quality of the methoxyamine is improved. And meanwhile, the tail gas subjected to efficient separation is relatively modified, so that subsequent further treatment on the tail gas is facilitated.

The invention belongs to the technical field of organic synthesis, and discloses a preparation method of oxime ether and methoxyamine hydrochloride. According to the method, tert-butyl alcohol is used as a solvent, a methylation reagent, sodium hydroxide, ketoxime and the solvent are subjected to a condensation reaction, reaction liquid is subjected to rectification separation, fractions are collected, and oxime ether is obtained; and mixing the tower bottom residual liquid with a hydrochloric acid solution, and carrying out hydrolysis reaction to obtain methoxyamine hydrochloride. Efficient dissolution of a methylation reagent is achieved through a tert-butyl alcohol solvent system, an oxime ether intermediate is prepared in cooperation with a low-temperature condensation reaction, a hydrochloric acid hydrolysis reaction is completed in a tower after rectification separation, and finally methoxyamine hydrochloride and sodium chloride are obtained. And through solvent innovation, process integration and premixing control technologies, the reaction selectivity is remarkably improved, and the raw material consumption is reduced.

The application discloses a method for cleaning the surface pollution of a polyamide composite membrane and simultaneously repairing the water flux and salt retention rate of the polyamide composite membrane, and the method comprises the following steps: step 1, under normal temperature conditions, immersing a polyamide composite membrane damaged by oxidation of active chlorine substances into a repairing solution, wherein the repairing solution is composed of a methoxyamine salt and a metal catalyst; the methoxyamine salt is one or a combination of two or more of methoxyamine hydrochloride, methoxyamine sulfate, methoxyamine phosphate, methoxyamine acetate, methoxyamine trifluoroacetate, methoxyamine formate, methoxyamine methanesulfonate, methoxyamine trifluoromethanesulfonate and methoxyamine p-toluenesulfonate; and step 2, after 2-5 hours of repairing, taking out the polyamide composite membrane and washing away the residual repairing solution with water. The method can clean and remove the inorganic scaling, organic matter and other pollutants on the surface of the polyamide composite membrane while repairing the water flux and salt retention rate of the polyamide membrane damaged by sodium hypochlorite oxidation.

The application discloses a mother liquor tail gas heat recovery device and method in methoxyamine production, which comprises a mother liquor kettle, a waste heat exchanger, a high-efficiency gas-liquid separation tank, a liquid alkali temporary storage tank, a liquid alkali circulating pump and a distillation kettle; the outlet of the mother liquor kettle is communicated with the gas phase inlet of the waste heat exchanger through a pipeline, the gas phase outlet of the waste heat exchanger is communicated with the inlet of the high-efficiency gas-liquid separation tank through a pipeline, and the gas phase outlet of the high-efficiency gas-liquid separation tank is connected to a tail gas system through a pipeline. The process can maximize the recovery of the heat in the mother liquor tail gas, effectively improve the initial temperature of the feeding liquid alkali, reduce the steam consumption in the early warming process of methoxyamine distillation, and enable the low-temperature gas phase at the outlet of the waste heat exchanger to enter the high-efficiency gas-liquid separation tank, so that the liquid drops entrained in the low-temperature gas phase can be effectively recovered; meanwhile, the tail gas after high-efficiency separation is relatively modified, and the subsequent further treatment of the tail gas is facilitated.