Some comments to add to Irish Lass' most excellent words of wisdom --
If you are using regular coconut oil, the melt temperature is about 76 degrees F, not 92 F.
As far as at what temperatures that soaping oils will boil -- this is not going to remotely be an issue under normal conditions of soaping. By the time you reach the boiling point, your oil will have already started break down, smoke, turn color, smell, and all that. This isn't something that's going to happen with normal soaping. If it does happen by accident, it will be really really obvious something is not quite right.
"...I knew that the soap I had to throw away was ruined because I cooked it above 400 degrees. ..."
Okay, this might be one case where it's obvious something is not quite right. I can only think of one possibility where soap could get that hot, and that's if you cooked the soap directly over the stove burner. Most people use a crock pot, hot water bath (bain marie), or oven.
"...I need to mix in my EO and FO mixture when the soap temperature is pretty close to 120 degrees, which means I'm running the risk of having my EO and FO burn off rather than infusing into my soap..."
There is nothing magic about 120 deg F that I'm aware of, so I'm not sure why you are worried about that particular temperature. Just make your HP soap without scent. When it's fully saponified, mix your scent into the soap when the soap is as cool as reasonably possible.
As far as mixing your EOs and FOs in a portion of your soaping fat and expecting the soaping fat to "protect" the fragrance ... that isn't going to happen. The volatility of the EOs and FOs is going to be about the same regardless of what you mix the scent into.
And unless you expose the EOs or FOs to flame or spark, you aren't "burning off" the scent. The scent is evaporating -- this is a totally different process than burning.
Your scent is also not infusing into the soap. Making tea is infusion -- you put tea leaves into water and allow the water to solubilize (dissolve) some of the chemical compounds in the tea leaves. You've got the scent as a final product and you're mixing it directly into the batter, so this is not infusion.
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Here are some comments I've made in other SMF threads that may be helpful:
...Flash point is the temperature at which a combustible or flammable substance will burn if exposed to a flame (not a spark -- it has to be a flame). The fire may stop if the flame is removed, but the by definition the material will continue to burn as long as it is at or above its flash point temperature and a flame is present. The flash point enters into safety during shipping and storage, because a low flash-point material in a fire can make the fire much worse. That is why there are often hazardous material charges or restrictions on shipping low flash point materials. When the material is mixed with other stuff, like soap for instance -- the flash point of that one ingredient does not apply to the whole.
Flash point can be used as a rough measure of how volatile a flammable/combustible substance is. Bear in mind that not all volatile substances are flammable or combustible, so flash point isn't an absolute measure of volatility. For example, water is not flammable or combustible, but it is volatile (evaporates easily). As another example, common soaping oils are combustible, but they do not evaporate easily at all. Many people use the flash point as the temperature at or below which they can "safely" add fragrance to soap.
I don't pay any attention to that -- the flash point temp in this context is pretty much meaningless. When mixed into the soap, the fragrance won't burn for one thing. For another, one shouldn't be mixing fragrance into soap batter close to open flame. And finally, fragrance, even if it is below its flash point, is still going to evaporate -- the warmer the soap, the faster the evaporation. My goal, whatever the fragrance, is to add it at the coolest temperature I can manage....
http://www.soapmakingforum.com/showthread.php?t=50083
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...Some substances do not have a flash point -- they either do not have burnable vapors, or chemically degrade before they reach a flash point, or do not produce any vapor under normal conditions. Things like gasoline, liqueurs, EOs, and FOs do have a flash point. For safety's sake it's wise to keep spark or flame away from these substances if you are working with them near their flash point.
The boiling point is where a liquid stops increasing in temperature in response to added heat energy -- all added energy goes into the boiling process only. Bubbles of vaporized material form within the liquid and rise to the surface at the boiling point. The flash point of a substance may be above the boiling point ... or it may be below. It depends on the flammability of the vapors.
Both properties are obviously related to volatility, but what I'm reading in this thread is that a substance is not volatile -- it will not evaporate -- before the flash or boiling point is reached, and that's just not true.
Long before a substance reaches its flash point or boiling point, a substance is still volatile, meaning it will evaporate. It is just volatilizing without actually boiling or burning. If substances were not volatile before their flash or boiling points, you couldn't smell bread baking, you couldn't watch vapor rise from a hot cup of coffee, and you would not be able to smell the fragrance in soap. Sheets wouldn't dry when hung on a clothesline, clouds in the sky would not exist, bread would never go stale, and your soap would never lose its scent. All of these things relate to the volatility of a substance even though the temperature is well below its boiling and flash points.
Bottom line ... respect the flash point of your EOs and FOs for safety's sake. Add fragrance to your B&B products when they are as cool as possible. Understand that volatility of a fragrance is related to temperature, time, and concentration, as well as the inherent vapor pressure of the chemicals in the fragrance.
Some compounds in an FO or EO have a higher vapor pressure than others and will not last as long. These highly volatile chemicals are the "top notes" in a fragrance. Citrus and many floral scents fall in this category. Some compounds last much longer in a fragrance. These chemicals are less volatile -- they have a lower vapor pressure -- and make up the long lasting "bottom notes". Patchouli, benzoin, frankincense come to mind....
http://www.soapmakingforum.com/showthread.php?p=409116