Preparation method of tilmicosin phosphate crystal
A technology of tilmicosin phosphate and crystals, which is applied in the preparation of sugar derivatives, chemical instruments and methods, organic chemistry, etc., can solve the problems of reducing the content of tilmicosin phosphate, physical injury of operators, and affecting normal use, etc. Achieve the effects of reducing physical hazards, reducing pollution, and fast dissolution
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Embodiment 1
[0021] Weigh 10 kg of Tilmicosin phosphate powder, and weigh 30 L of ethyl acetate. Tilmicosin phosphate was added to ethyl acetate, stirring was started for dissolution, and the rotation speed was controlled at 20r / min. Then the temperature was lowered to 5°C, and isopropyl ether was slowly added under stirring. The amount of isopropyl ether added was 30L. When adding dropwise, the amount added per minute is controlled to be 1 / 10 of the total amount, the speed is controlled at 15r / min, and the temperature is always controlled at 0~5℃ during the whole process. At the end of the dropping, the stirring speed is controlled at 10r / min, and the stirring is continued for 1 hour. Use a centrifuge for solid-liquid separation. The solid obtained after centrifugation was washed twice with isopropyl ether at 5°C, the first rinse was 15L, and the second rinse was 15L. At a temperature of 50℃, using a double-cone rotary vacuum dryer, the vacuum degree is controlled at -0.02MPa, and the d...
Embodiment 2
[0023] Weigh 10 kg of Tilmicosin phosphate powder, and measure 40L of ethyl acetate. Tilmicosin phosphate was added to ethyl acetate, stirring was started to dissolve, and the rotation speed was controlled at 25r / min. Then lower the temperature to 3°C, slowly add isopropyl ether while stirring, the amount of isopropyl ether added is 60L, and the amount added per minute is controlled to be 1 / 10 of the total amount during dripping, and the speed is controlled at 25r / min. During the whole process The temperature is always controlled at 0~5℃. At the end of the dripping, the stirring speed is controlled at 10r / min, and the stirring is continued for 1h. Use centrifugal equipment for solid-liquid separation. The solid obtained after centrifugation was rinsed twice with isopropyl ether at 3°C, the first dose was 29L, and the second dose was 30L. At a temperature of 55°C, a double-cone rotary vacuum dryer was used, and the vacuum degree was controlled at -0.05MPa, until the drying we...
Embodiment 3
[0025] Weigh 10 kg of Tilmicosin phosphate powder, and weigh 50L of ethyl acetate. Tilmicosin phosphate was added to ethyl acetate, stirring was started to dissolve, and the rotation speed was controlled at 30r / min. Then lower the temperature to 0°C, slowly add isopropyl ether under stirring, the amount of isopropyl ether added is 100L, and the amount added per minute is controlled to be 1 / 10 of the total during the dripping, and the speed is controlled at 30r / min. During the whole process The temperature is always controlled at 0~5℃. At the end of the dropping, the stirring speed is controlled at 10r / min, and the stirring is continued for 1 hour. Use centrifugal equipment for solid-liquid separation. The solid obtained after centrifugation was washed twice with isopropyl ether at 0° C. The amount of isopropyl ether used for the first time was 48 L, and the amount of isopropyl ether used for the second time was 49 L. At a temperature of 60°C, a double-cone rotary vacuum drye...
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