Method for efficiently purifying artemisinin
A kind of artemisinin, high-efficiency technology, applied in the direction of organic chemistry, can solve the problems such as difficult separation of impurities, achieve the effect of reducing recrystallization steps, improving production efficiency and product quality
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[0024] Example 1
[0025] Add 200g of Artemisia annua leaves and petroleum ether (1600mL and 1200mL, corresponding to two extraction processes respectively) into a round bottom flask, reflux extraction at 55℃ for 2 times, extraction time is 2h, combine the two extracts Concentrate the extract at 45°C to obtain an extract containing artemisinin; add 14mL of 70% methanol aqueous solution to the extract, stir and extract at 55°C for 30min, filter after the extraction is complete, add acetic acid to the extract Ethylene-vinyl acetate copolymer with 25% ethylene content and 10% of the mass of the extractant. Stir at 50°C for 2 hours, crystallize at 10°C for 5 hours, separate solid and liquid, and dry at 50°C to obtain crude artemisinin. The artemisinin content is 96%, and the crude product is recrystallized once to obtain an artemisinin product with a purity of 99.2%.
Example Embodiment
[0026] Example 2
[0027] Add 200g of Artemisia annua leaves and petroleum ether (1600mL and 1200mL, corresponding to two extraction processes respectively) into a round bottom flask, reflux extraction at 55℃ for 2 times, extraction time is 2h, combine the two extracts Concentrate the extract at 45°C to obtain an extract containing artemisinin; add 14mL of 70% methanol aqueous solution to the extract, stir and extract at 55°C for 30min, filter after the extraction is complete, add acetic acid to the extract An ethylene-vinyl acetate copolymer with an ethylene content of 40%, the amount of the copolymer added is 10% of the mass of the extractant, stirring at 50°C for 2 hours, crystallization at 10°C for 5 hours, solid-liquid separation, and drying at 50°C to obtain crude artemisinin. The artemisinin content is 93%, and the crude product is recrystallized once to obtain an artemisinin product with a purity of 98.9%.
Example Embodiment
[0028] Example 3
[0029] Add 200g of Artemisia annua leaves and petroleum ether (1600mL and 1200mL, corresponding to two extraction processes respectively) into a round bottom flask, reflux extraction at 55℃ for 2 times, extraction time is 2h, combine the two extracts Concentrate the extract at 45°C to obtain an extract containing artemisinin; add 14mL of 70% methanol aqueous solution to the extract, stir and extract at 55°C for 30min, filter after the extraction is complete, add acetic acid to the extract Ethylene-vinyl acetate copolymer with 25% ethylene content, the amount of copolymer added is 5% of the mass of the extractant, stirred at 23°C for 2 hours, crystallized at 10°C for 5 hours, and dried at 50°C to obtain crude artemisinin with artemisinin content Is 99%.
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