precipitated out 怎样理解? the dialyzed solution 是指透析完并过膜之后的溶液。因为后面的过滤洗涤并没有提到膜滤,还有后面的工艺已经说明了。 the dialyzed solution was reduced under vacuum to 500ml and the product precipitated out with methanol (5l).the solid was filtered, washed with methanol, acetone and mtbe and crushed to a fine powder and dried to give 95g. 透析液通过抽真空(楼上翻译得很传神)减少至500毫升,用5升的甲醇沉淀出产品。沉淀(固体产物)经甲醇、丙酮和甲基叔丁基醚滤洗,碾碎成细粉然后干燥,得到95克。 应该膜滤后抽真空,如果同时进行设备很难搞定。 后记:综合若干次的翻译发现赖赖对现在做的工作可能不太熟悉(可能化学方面学的少吧),一定很辛苦,好好努力吧,呵呵。 [ ]查看更多