Preparation method of antioxidant
An antioxidant and potassium iodide technology, applied in the chemical industry, can solve the problems of cumbersome reaction steps, severe reaction conditions, unsuitable for industrial production and the like, and achieves the effects of economical and environmental protection of the solvent and simplified preparation process.
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Embodiment 1
[0029] Embodiment 1: a kind of thiotaurine preparation method is as follows:
[0030] Weigh 28.4 g of mercaptoethylamine hydrochloride (cysteamine hydrochloride) and place it in a 500 mL flask, add 150 mL of deionized water to dissolve. Add 0.33 g of potassium iodide, then add 36.5 g of 35% hydrogen peroxide, and react overnight at room temperature. Add 37.5g of 40% potassium hydroxide solution for alkaline hydrolysis, and electrodialyze after the alkaline hydrolysis is completed until the conductivity of the separated light-phase brine reaches 7ms / cm to desalinate, and the collected components are vacuum-spun to dry. Disperse the obtained solid in methanol, add 1 equivalent of sulfur powder, 0.1 equivalent of potassium hydroxide, reflux for 4 hours, filter, dissolve the solid in water, add 10% activated carbon for decolorization for half an hour, filter, evaporate the filtrate to dryness, and weigh 50% methanol aqueous solution Crystallized, filtered and dried to obtain 10.2...
Embodiment 2
[0031] Embodiment 2: a kind of thiotaurine preparation method is as follows:
[0032] Weigh 28.4 g of mercaptoethylamine hydrochloride (cysteamine hydrochloride) and place it in a 500 mL flask, add 150 mL of deionized water to dissolve. Add 0.33 g of potassium iodide, then add 36.5 g of 35% hydrogen peroxide, and react overnight at room temperature. Add 37.5g of 40% potassium hydroxide solution for alkaline hydrolysis, electrodialysis, until the conductivity of the separated dilute brine reaches 5ms / cm to desalinate, collect the components, and spin dry in vacuo. Disperse the obtained solid into ethanol, add 1 equivalent of sulfur powder, 0.1 equivalent of potassium hydroxide, reflux for 4 hours, filter, dissolve the solid in water, add 10% activated carbon for decolorization for half an hour, filter, evaporate the filtrate to dryness, and weigh 40% ethanol solution Crystallized, filtered and dried to obtain 10.6 g of white crystals with a purity of 99.5% and a yield of 45.1%...
Embodiment 3
[0033] Embodiment 3: a kind of thiotaurine preparation method is as follows:
[0034] Weigh 28.4 g of mercaptoethylamine hydrochloride (cysteamine hydrochloride) and place it in a 500 mL flask, add 150 mL of deionized water to dissolve. Add 0.33 g of potassium iodide, then add 36.5 g of 35% hydrogen peroxide, and react overnight at room temperature. Add 37.5g of 40% sodium hydroxide solution for alkaline hydrolysis, electrodialysis, until the conductivity of the separated dilute brine reaches 4ms / cm to desalinate, collect the components, and spin dry in vacuo. Disperse the obtained solid in methanol, add 1 equivalent of sulfur powder, 0.1 equivalent of sodium hydroxide, reflux for 4 hours, filter, dissolve the solid in water, add 10% activated carbon for decolorization for half an hour, filter, evaporate the filtrate to dryness, and weigh 60% methanol solution Crystallized, filtered and dried to obtain 9.3 g of white crystals with a purity of 99.2% and a yield of 39.6%.
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