buying high quality Benzydamine HCL 132-69-4

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buying  high quality  Benzydamine HCL  132-69-4

Production method
With phthalates as raw material, pyridamine is generated by chemical reactions such as heavy nitride, reduction, circumnation, hydrocarbonization, condensation, salt formation, etc. The specific operation is as follows: (1) heavy nitride side stirring side of the phthalates into a certain amount of water, plus concentrated hydrochloric acid, so that the reactant dissolved, and then add hydrochloric acid crystallization. Cold to less than 3 degrees C, slow drops plus sodium nitrite water solution, temperature does not exceed 3 degrees C, continue to stir, to transparent tan heavy nitrogen salt solution. (2) reduced to less than 10 degrees C, the heavy nitrogen salt solution dropped into the sulfur dioxide saturation solution, left and then thickened hydrochloric acid, stirred under crystallization, cold to less than 5 degrees C, placed, filtered, pumped to phthalates. (3) ring will reduce the reduced material and water, salt reflux for 30 minutes, concentrated, while hot carbonic acid neutral to pH of 7, placed, filtered, washed, dried, get 3-hydroxyquine. (4) Hydrocarbonization will be cyclospheric and waterless ethanol, sodium hydroxide heated back to flow, cold after filtration, filter liquid frozen overnight to extract crystallization, filtration, drying, that is, 1-pyridine-3-hydroxyquine. (5) Condensation heats the hydrocarbons, xylene and chopped metal sodium backflow, while stirring the edge heats up to the melting of metal sodium, white gas is produced. Stop heating, the reactant thickens to the paste, the droplets are mixed with dimethyl chloropropane and toluene, and the reflux reaction continues after the drop. Cool, filter, wash with xylene. The filter liquid is combined with the lotion, extracted with dilute hydrochloric acid, added alkali, precipitated oil layer, and dried with sodium sulfate without water. This is the pyridamine free alkali, refined after the usual legal system into hydrochloride.