6 results about "Chloromethyl methyl ether" patented technology

This application relates to the field of polymer materials, specifically disclosing a resin for removing nitrate nitrogen from high-concentration sulfate solutions and its preparation method. The preparation method includes the following steps: S1, dispersing an oil-phase solution containing styrene, divinylbenzene, a porogen, and an initiator in an aqueous solution, polymerizing, and then washing with a solvent to obtain porous polymer spheres; S2, subjecting the obtained porous polymer spheres to chloromethyl ether for chloromethylation treatment to obtain a pre-modified resin; S3, subjecting the pre-modified resin to an amination reaction with an amination reagent to obtain a nitrate-removed resin; the nitrate-removed resin has a pore size of 2-10 nm accounting for 50-90%; this application also discloses the nitrate-removed resin prepared by the above preparation method. This application has the characteristic of achieving the removal of nitrate nitrogen from high-concentration sulfate wastewater.

The invention relates to the technical field of hydrogen energy preparation and impurity removal, in particular to high-alkali-resistance ion exchange resin for hydrogen energy preparation and impurity removal, which is prepared from the following raw materials: styrene, divinylbenzene, a pore-foaming agent, an initiator, an inorganic modifier, chloromethyl ether, an amination reagent and a polymerization inhibitor. The inorganic modifier is SiO2 (silicon dioxide) nano particles or TiO2 (titanium dioxide) nano particles modified by gamma-aminopropyl triethoxy silane; the amination reagent is N, N-dimethyl cyclohexylamine. Through an inorganic and organic synergistic modification strategy and optimized selection of an amination reagent with better alkali resistance, activity attenuation and structural deterioration of functional groups of the resin in a high-alkali environment are effectively inhibited, capacity loss of the resin in long-term operation is remarkably reduced, the service life of the resin is greatly prolonged, and the service life of the resin is prolonged. The long-term operation requirement of a high-alkali working condition in a hydrogen energy preparation process can be fully met, the resin replacement frequency is reduced, and the process operation cost is reduced.

The invention provides a method for removing aluminum from rare earth leaching liquid, and relates to the technical field of metal extraction technologies. A method for removing aluminum from rare earth leachate comprises the following steps that S1, styrene and divinylbenzene are mixed, then a pore-foaming agent is added, and an organic phase is obtained after stirring; s2, dissolving polyvinyl alcohol in deionized water, and stirring until the polyvinyl alcohol is completely dissolved to obtain a water phase; s3, slowly adding the organic phase into the water phase, stirring to form a stable suspension, and transferring the stable suspension to a reaction kettle; s4, introducing nitrogen into the reaction kettle, heating, and polymerizing to obtain resin white balls; and S5, mixing the resin white balls with chloromethyl ether. The D290 resin is matched with the 5-sulfosalicylic acid for use, so that the separation difficulty of the complex is reduced. According to the novel technology, efficient aluminum removal can be achieved under the mild condition, rare earth loss is reduced, and the technology is environmentally friendly; through complexing condition optimization, adsorption process design and gradient regeneration technology, directional removal of aluminum ions and cyclic utilization of resin are realized.

The invention discloses a recovery method of sevoflurane water-alcohol mother liquor, and belongs to the technical field of medicines. The method comprises the following steps: adding perlite into sevoflurane water-alcohol mother liquor, removing fluorine ions to obtain a fluoride-free water-alcohol solution, carrying out reduced pressure distillation on the solution to remove water, adding an inert organic solvent, recovering solid which is high-purity metal chloride, carrying out reduced pressure recovery on liquid which is the organic solvent, and recovering the residual solvent which is a high-boiling-point alcohol solvent; the sevoflurane water-alcohol mother liquor is a water phase obtained by adding water into a reaction solution of chloromethyl ether and alkali metal fluoride in a high-boiling-point alcohol solvent and carrying out phase splitting. Particularly, a reaction product metal chloride and high-boiling-point alcohol in the reaction are recycled. The benefit maximization of the sevoflurane process is realized, the three wastes are reasonably treated, and the comprehensive utilization of resources is realized.

The application discloses a preparation method of a novel MOM-protected C3 side chain of cefodizime, and belongs to the technical field of pharmaceutical synthesis intermediates. The method is as follows: 2-chloro-3,4-dihydroxybenzaldehyde is used as raw material, and chloromethyl methyl ether (MOMCl) or bromomethyl methyl ether (MOMBr) is used to protect two phenolic hydroxyl groups. After the aldehyde group is oxidized into a carboxylic acid by using a Pinnick method, the carboxylic acid is condensed with 2-chloroethylamine to obtain an amide, and finally, the amide is reacted with tetrahydropyrrole to obtain the target product: 2-chloro-3,4-bis(methoxymethoxy)-(2-(pyrrol-1-yl)ethyl)benzamide. N The application has mild reaction conditions and simple operation, and is suitable for industrialized production of cefodizime.