Preparation method of azadirachtin dry powder
A technology of azadirachtin and dry powder, applied in the direction of organic chemistry and the like, can solve the problems of not mentioning the solvent recovery rate, unfavorable to the dry powder of azadirachtin, influence on the stability of azadirachtin, etc. Low cost and high equipment requirements
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Embodiment 1
[0025] (1) After mixing 1 kg of dried neem seeds and 1 kg of petroleum ether, place it in the rapid extractor described in Chinese patent ZL200820080967.5 to extract neem oil with stirring, filter to obtain filtrate and filter residue, and add petroleum ether to the filter residue 1kg continued to extract neem oil, filtered to obtain filtrate and filter residue, combined secondary filtrate, and after the filter residue was air-dried, it was neem cake 700g; after the combined secondary filtrate was recovered petroleum ether under reduced pressure, 300g of neem oil was obtained;
[0026] (2) After mixing 700g of neem cake obtained in step (1) with 700g of methanol, place it in the rapid extractor of step (1) for stirring and extraction for 3 minutes, filter to obtain the filtrate and filter residue, add 700g of methanol to the filter residue and mix , stirred and extracted for 3 minutes, repeated extraction three times like this, collected three times of filtrate 2100mL, and then...
Embodiment 2
[0032] (1) After mixing 100kg of dried neem seeds and 200kg of petroleum ether, place it in the rapid extractor described in Chinese patent ZL200820080967.5 to extract neem oil with stirring, filter to obtain filtrate and filter residue, and add petroleum ether to the filter residue 200kg continue to extract neem oil, filter to get filtrate and filter residue, merge the secondary filtrate, after the filter residue is air-dried, it is neem cake 70kg; the combined secondary filtrate obtains neem oil 30kg after decompression reclaiming sherwood oil;
[0033] (2) After mixing 70kg of neem cake obtained in step (1) with 140kg of methanol, place it in the rapid extractor of step (1) for stirring and extraction for 3 minutes, filter to obtain the filtrate and filter residue, add 140kg of methanol to the filter residue and mix , stirred and extracted for 3 minutes, repeated extraction three times like this, collected 420L of filtrate three times, then concentrated the filtrate to 1 / 3 o...
Embodiment 3
[0039] (1) After mixing 1 kg of dried neem seeds with 3 kg of petroleum ether, place it in the rapid extractor described in Chinese patent ZL200820080967.5 to extract neem oil with stirring, filter to obtain filtrate and filter residue, and add petroleum ether to the filter residue 3kg continued to extract neem oil, filtered to obtain filtrate and filter residue, combined secondary filtrate, and after the filter residue was air-dried, it was neem cake 700g; after the combined secondary filtrate recovered petroleum ether under reduced pressure, 300g of neem oil was obtained;
[0040] (2) After mixing 700g of neem cake obtained in step (1) with 700g of methanol, place it in the rapid extractor of step (1) for stirring and extraction for 3 minutes, filter to obtain the filtrate and filter residue, add 700g of methanol to the filter residue and mix , stirred and extracted for 3 minutes, repeated extraction three times like this, collected three times of filtrate 2100mL, and then co...
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