I think that would be plausible, though butane I believe inherently leaves trace chemicals other solvents I guess don't. Rick Simpsons go to solvent is Naphtha I believe, and it apparently works real well at not absorbing the chlorophyll from the plant matter. He also likes alcohol but says you will end up with a darker product because of the chlorophyll. I've been making oil for the last 8-9 months using Iso alcohol, I'm gonna try some grain alcohol once I go get some. I've tried the traditional method, which includes shaking the material in the solvent, then evaping, which did give me more chlorophyll but still good product. I have also made some pure amber oil with the Iso, by doing a single fast wash on a small amount of material and repeating for a whole batch. Good luck have fun, and use proper ventilation!!!