I need to know a few things. I am doing my internship and have been given a problem with very limited information. I have to decide whether to use packing or plates. The tower is to be used for several different mixtures. So everytime it has to be washed completely, whenever a new seperation is to be done. So the internals of the tower have to be as such that they can be washed easily so that there is NO CROSS CONTAMINATION. And there is cost limit too. Cant afford a too expensive column too beacuse it is not a big thing. It is for a reboiler of 250 litres. Any suggestion???