Quote Originally Posted by ysobro
The yield is so pitiful (<10% if that) that I didn't want to continue.
What this % exactly mean? That the amount of oil you got is less than 10% of the amount of weed you started with? (For example, you started with 1g of weed and got less than 0.1g of oil)?

Quote Originally Posted by ysobro
(How do I know? I don't. I just monitor the temperature and assume that if ethanol's boiling point is ~160-170F, then when the temperature rises to ~200 that means that the alcohol is evaporated. People with better chemistry knowledge please chime in here)
If the temperature were significantly higher than ethanols b.p., it must have evaporated completly.

Quote Originally Posted by ysobro
My knowledge of chemistry is limited but I wonder if whatever THC that's extracted into the alcohol gets tossed with the water. Does that alcohol-dissolved THC then become water soluble? or just alchohol soluble? my hope is that whatever thc gets extracted from boiling in the ethanol gets pushed into the oil layer thus making it more concentrated. Who knows!
The THC that was dissolved in alcohol does not turns water soluble. A small part of it may remain unsolved but in suspension in the water. Hopefully, most (if not all) of it will reach the oil layer and get dissolved in it.

If you didnt get good results when making a butane extraction, you should do what jimmy8778 suggested and make a pure ethanol extraction, and then dissolve the resulting hash oil in the oil. Maybe it can give better results.