Carlos Araújo Queiroz
The wet caustic soda pellets can be dried, preferably in vacuum, at temperatures at which the pellets do not melt, what depends on its moisture content. That can be attained by first drying at about 180 ºC for initial moisture content not exceeding 10 wt%, and preferably also hereafter at, say 260 ºC, until constant mass. Drying in dry and CO/CO2-free air (or in inert gas) may be found acceptable, but that is a much slower process and the dried pellets are expected to contain an higher content of trace water.
Usually, caustic soda pellets are just weighted as commercially supplied and the prepared solutions are later standardized for analytical purposes.
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