5 results about "Butanesultone" patented technology

The application belongs to the technical fields of electrolyte additive and organic synthesis, and discloses a synthesis method of 2,4-butan sulfonic acid lactone. The synthesis method comprises the following steps: (1) stirring and dissolving 1,3-butanediol, sulfonating reagent and iodine salt catalyst in water, adjusting the pH of the system to be acidic, stirring and reacting at 50-100 DEG C, and obtaining 3-hydroxy butane sulfonate solution; (2) concentrating, acidifying, desalting and dehydration cyclization reaction of the 3-hydroxy butane sulfonate solution obtained in step (1) in sequence, and obtaining 2,4-butan sulfonic acid lactone. The synthesis method adopts 1,3-butanediol and sulfonating reagent to obtain 3-hydroxy butane sulfonate solution under the catalysis of iodine salt, and then obtains 2,4-butan sulfonic acid lactone through acidification and dehydration cyclization, and has the advantages of wide raw material source, mild reaction condition, less by-product, high product quality and low cost.

This invention discloses a method for preparing benzothiophene derivatives, relating to the field of compound preparation. In preparing benzothiophene derivatives, this invention involves mixing and reacting N-methylimidazolium, 1,4-butanesulfonate lactone, and sulfuric acid to obtain an ionic liquid catalyst; mixing and reacting thiophene, 2,5-dimethoxytetrahydrofuran, and the ionic liquid catalyst under microwave conditions to obtain benzothiophene; and mixing and reacting benzothiophene, 2,4,5,6-tetra(diphenylamino)-isophthalonitrile, and N,N-dicyclohexylmethylamine under photocatalysis to obtain the benzothiophene derivative. The benzothiophene derivatives prepared by this invention utilize ionic liquid catalysis and microwave-assisted preparation of benzothiophene, followed by photocatalysis to prepare the benzothiophene derivatives, avoiding the use of metal catalysts and constructing an efficient and green synthetic route. The benzothiophene derivatives prepared using this method exhibit good yields.

The invention discloses a solid organic acid, a preparation method thereof and an application of the solid organic acid in biodiesel preparation, and the solid organic acid is prepared by heating and reacting 2, 5-dimercapto-1, 3, 4-thiadiazole and sultone (1, 3-propane sultone or 1, 4-butane sultone) at 110-150 DEG C in a nitrogen atmosphere in the presence of triethylamine. The preparation method of the solid organic acid is simple to operate, the prepared solid organic acid shows excellent catalytic activity and catalytic stability when catalyzing esterification of fatty acid and methanol to prepare biodiesel, and the biodiesel with the yield of 97% or above can be obtained through reaction at the mild temperature for a short time. And after the reaction is finished, unreacted methanol and generated water are removed through rotary evaporation, the solid organic acid can be automatically precipitated and separated out, and the solid organic acid can be recycled through simple filtration. Therefore, the solid organic acid prepared by the method has a good industrial application prospect in the field of biodiesel preparation by catalyzing fatty acid esterification.

The invention relates to the technical field of membrane separation, and discloses a preparation method of a pollution-resistant composite loose nanofiltration membrane, which comprises the following steps: mixing and dissolving N-methyl-4-piperidone and 1, 4-butanesultone in a first solvent to obtain a zwitterionic piperidine monomer; mixing and dispersing the zwitterionic piperidine monomer, p-terphenyl and N-methyl-4-piperidone in a second solvent to obtain a mixed solution, and adding trifluoroacetic acid and trifluoromethanesulfonic acid into the mixed solution at low temperature for reaction to obtain a zwitterionic copolymer; dissolving the zwitterionic copolymer in a third solvent, and performing defoaming treatment and membrane scraping to obtain a loose nanofiltration membrane; comprising the loose nanofiltration membrane and application thereof. The hydrophilicity of the polymer membrane is improved, the anti-pollution performance of the membrane is enhanced, and the separation efficiency of dye and salt is improved.