Anti-reversion agent disodium hexa-methylene-1,6-dithiosulfate dihydrate was synthesized using 1,6-dichlorohexane and sodium thiosulfate pentahydrate.The synthesis conditions of its crude product were investigated through orthogonal experi-ment and single factor experiments.In the recrystal-lization purification experiment,the solubility of sodium thiosulfate in ethanol-water solution system at different temperatures was combined to obtain the optimal ethanol concentration,recrystallization tem-perature and crystallization times in the recrystal-lization process.Finally,the synthesized product was analyzed by Fourier transform infrared spectroscopy,X-ray diffraction and thermogravimetry analysis-differential scanning calorimetry.The results showed that the optimum reaction conditions for synthesizing disodium hexamethylene-1,6-dithiosulfate dihydrate were as follows:mass fraction of 1,6-dichlorohexane 14％,mass ratio of ethanol to water 3/4,pH value of reaction system 9,and reaction temperature 83 ℃.At this time,the purity and yield of the crude pro-duct were the highest.The product with purity of over 97％and one-pass yield of over 80％could be obtained by using ethanol solution with mass fraction of 80％and recrystallizing twice at 20 ℃.
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