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vacuum concentration/distillation may work. essentially putting the liquid under a vacuum causes the liquid to boil without having to heat it as much/at all. A rotary evaporator would do it but costs 2,000-15,000. alternatively you could hook a sidearm flask to a vacuum pump on a stirring hot plate for much less but it would probably take longer. A spray dryer would work but similarly costs a lot, however you can replicate the process with inexpensive tools (essentially the theory is that a slurry such as your stevia liquid is sprayed to fine particles into a hot chamber (350F+) and dried by the heat). It's touchy because too little heat will do nothing and too much will burn the powder but I've seen it done with a paint sprayer and a heat gun in an enclosed container (e.g. a pipe or trashcan depending on scale)
how to convert liquid dicetylmorphine to powder?
I love instructables! The best machine would be a lab-sized (aka "benchtop" or "table top") rotary drum dryer, since the split second the liquid hits the stainless drum it solidifies, and is instantly scraped off. Buflovak makes them, but they are very expensive:
Image 1: Rotary Drum Dryer (Lab Sized)
Here is an equally-effective approach, frequently used in labs to turn liquids into powders. Cellulose fiber is natural plant fiber to make stems erect and strong (think celery). Cellulose absorbs many times its weight in liquid, such as stevia liquid. A commercial form of cellulose called "SolkaFloc" absorbs many times its weight in liquid. You would soak the cellulose with Stevia liquid, then dehydrate it in the sun, or using a home dehydrator.
Image 2: Powdered Cellulose Fiber
Dehydrate the soaked cellulose at 125-135 degrees. The water should dehydrate rapidly due to the cellulose's high surface area. Drying options include a home oven, a mini clothes dryer, or a food dehydrator.
Image 3: Mini Clothes Dryer
Image 4: Home Food Dehydrator
When dry, grind it using a coffee grinder: the kind with burrs give the most uniform particle size, but you could use a rocket blender.
Image 5: Electric Ceramic Burr Coffee Grinder
Image 6: Hand-Crank Ceramic Burr Grinder
SHOPPING: WHERE TO BUY IT
Buy a Bella rocket blender at Wal Mart:
Buy a hand-cranked ceramic burr coffee grinder:
Get an electrified ceramic burr mill at:
Buy the SolkaFloc cellulose from International Fibver Corp in Tonawanda, NY:
Buy a shelf-type food dehydrator from:
Order a mini clothes dryer tumbler from:
Large Scale Solar Dehydrator
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Posted:Jul 12, 2011
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