Wiktionary
fractionator
n. (context chemistry English) A piece of chemical engineering or laboratory apparatus that is used to separate the components of a mixture by fractionation, especially by fractional distillation or by chromatography
Usage examples of "fractionator".
So the fractionator is separating the different substances that are mixed together.
The fractionator turned itself off and he focused on and studied the slide it yielded.
That information, plus specific gravity, plus crystalline form, plus rate of diffusion in a fractionator, went to the stores of information packed in the computer's memory-banks somewhere between the ship's living-quarters and its outer skin.