The problem with chlorophyll is the taste.
There are two problems with chlorophyll. Taste is one of them. The other is that it makes the vapour really harsh and cough inducing.
I was actually getting into reflux distillation. This sounds very interesting to see if I can preserve terpenes this way. Maybe even extract just the terpenes.
Reflux and distillation are different. Reflux means that the vapour of the solvent in which you are boiling your plant matter is trapped, cooled off (condensed back into liquid form), and recycled back into the boiling vessel. Whatever terps may vapourize during the boiling will also be condensed and recycled.
Distillation is a bit more complicated. You start with a pure oil with no solvent at all left in it. You put it into a sealed container which is connected at the top using a ground glass joint to a columnar vapour trap that rises vertically up from it. After it gets to be about a foot or so higher than the top of the vessel, the column takes a sudden turn downward at about -45 degrees and travels downward until its opening is just above a second, unsealed container. You then heat the sealed container slowly and carefully monitor the temperature of the liquid.
The temp will rise steadily until it reaches the temperature of the particular cannabinoid or terpene in the oil that has the lowest boiling point. When the liquid starts to boil, the temperature will stabilize because the heat you are applying to the container is now being used to vapourize the cannabinoid rather than to further raise the temperature of the oil. As the cannabinoid vapour ascends, it hits the sudden turn in the column and as it then starts to descend, it condenses back into a liquid form and is collected by the second container. (Sometimes the downward portion of the column is cooled by blowing cold air on it, or somehow bathing it in cold flowing water.) The temperature in the boiling liquid will stay constant until all of that cannabinoid has boiled off.
Then the liquid stops boiling and its temperature starts to rise again. Soon, the cannabinoid in the oil with the second lowest boiling point starts to boil, the liquid temperature stabilizes again, but at the higher boiling point of the second cannabinoid, and the vapour of the second cannabinoid is condensed and flows down into the second container. Usually, you would substitute a new, empty second container and collect the second cannabinoid in it. So when all the cannabinoids have boiled off one by one and are collected in a series of second containers, you have a series of purified cannabinoids. That is why this process is called "fractional distillation" because you have split up the original oil into its various fractions. This is basically the same process as is used to make gasoline from crude oil.
Things might possibly at this point get a bit more complicated (depending on what you are distilling) because the temperature at which a cannabinoid or terp boils may be high enough to cause it to degrade. To avoid this, the open second container is replaced with one with an airtight, ground glass seal where the descending part of the column connects into the second container. Then the atmosphere inside the entire apparatus (now air tight) is evacuated using a vacuum pump. The cannabinoids will boil at a much much lower temp when they are in a vacuum which keeps them from degrading. Also the lack of oxygen inside the evacuated chambers prevents oxidation reactions which are one form of degradation. If you ever get this far with it, be careful because after the last cannabinoid with the highest boiling point has all evaporated, the temperature of whatever gunk remains at the bottom of the first chamber will start to rise quickly. It may catch fire or actually explode.
As you can see, fractional distillation is a lot more complicated than reflux extraction. Unless you are a lab rat or have a background in chemistry and enough money to acquire the glassware and vacuum pump, you might be better off to leave fractional distillation to the experts. Cheaper in the long run and also safer. Good luck!