What I usually do, when my solvent has gone from clear, to a yellow or orangeish color, is run it through a distillation. It clears it up and makes it like new.
I think I can perform a fractional distillation to separate the heptsne next time
Best of luck, hope you've got a decent column. If you really want to separate n-heptane from the 97-99°C fraction you might have to co-crystallise it with urea (iirc).
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