然后将咖啡渣过滤，萃取出溶剂(溶剂可被用到下次的溶解过程中)。
The grounds are then filtered out and the solvents separated (to be reused with the next batch of coffee grounds).
去除水蒸气一般不采用分离器、过滤器或萃取器。
Remove steam general does not use the separator, filter or extractor.
粗产物经硫酸铜溶液萃取、硅胶过滤、重结晶、真空升华进行分离提纯得到纯产品。
The products obtained were purified by extraction with copper sulfate solution, filtration through silica gel, recrystallization and vacuum sublimation.
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