在文献上看到这样一段
After a 2d reaction, the product was recovered by ultrafiltration (MWCO 1000 MW) under a nitrogen atmosphere for 12 h (water was changed three times), followed by freeze-drying.
不知道怎么做超滤这一步？请前辈指教
[ Last edited by elaine1226 on 2011-4-6 at 18:33 ]
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