Wood "distillation" is a pyrolysis, conducted hot enough to create compounds that were not present in the wood. So using a lower temperature to recover only the methanol is not an option.
Since you're equipped for distillation, I feel reasonable to distill the products once you've obtained them, and consider that up to 90°C for instance, everything that evaporates is methanol.
The operation is dirty for real. Tar sticks to the walls and is difficult to clean away, so foresee the proper means.
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Not exactly the topic, but:
Could we perhaps pyrolyze some low-value material together with wood to maximize the recovery of better fuel? Tar has a heating value but isnt' convenient. Conduct a sort of vapor cracking simultaneously with the pyrolysis?