Preparation of amorphous atorvastatin calcium
An atorvastatin calcium and amorphous technology, which is applied in the new preparation field of amorphous atorvastatin calcium, can solve the problems of flammability and explosion, and achieves the advantages of less time-consuming filtration, reduced hidden dangers in safety production, and easy large-scale operation. Effect
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Embodiment 1
[0032] Take 1 kg of crystalline atorvastatin calcium, add 5 L of methanol, stir to dissolve, slowly add it into 40 L of isopropyl ether at room temperature, precipitate a solid, continue stirring for 2 hours, filter, drain, and vacuum dry at 50 ° C for 12 hours to obtain 850 g Amorphous atorvastatin calcium, X-ray powder diffraction pattern confirms the amorphous nature of the product.
Embodiment 2
[0034] Take 1kg of crystalline atorvastatin calcium, add 15L of ethanol, stir to dissolve, slowly add to 160L of isopropyl ether at room temperature, precipitate solid, continue to stir for 2 hours, vacuum filter, drain, and vacuum dry at 50°C for 12 hours to obtain 830 g of amorphous atorvastatin calcium, the X-ray powder diffraction pattern confirms the amorphous nature of the product.
Embodiment 3
[0036] Take 1kg of crystalline atorvastatin calcium, add 20L of ethanol, stir to dissolve, slowly add to 240L of isopropyl ether at room temperature, precipitate solid, continue to stir for 2 hours, vacuum filter, drain, and vacuum dry at 50°C for 12 hours to obtain 825 g of amorphous atorvastatin calcium, the X-ray powder diffraction pattern confirms the amorphous nature of the product.
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