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How to dry 96% enthanol to 100%

Migrated topic.
yeah, i am sure i never got above 99.% ish. my meter was 0-100. the good ones read 190-200 proof scale, so much more accurate. the ones i found were made in germany for about 300usd. is it really necessary to get absolute absolute for your purposes?
 
you may find h2so4 a bit sheepish for this. look for more recent data since the alchemist. i may be thinking of d-11 or something else related. i know ive read sulf everywhere but i also read it doesnt work for one of the things it sposed to
 
Vogel's Practical Organic Chemistry 5th ed. said:
Dehydration of rectified spirit by calcium oxide. Pour the contents of a Winchester bottle of rectified spirit [azeotropic mixture] (2-2.25 litres) into a 3-litre round-bottomed flask and add 500 g of calcium oxide which has been freshly ignited in a muffle furnace and allowed to cool in a desiccator. Fit the flask with a double surface condenser carrying a calcium chloride guard-tube, reflux the mixture gently for 6 hours (preferably using a heating mantle) and allow to stand overnight. Reassemble the condenser for downward distillation via a splash head adapter to prevent carry-over of the calcium oxide in the vapour stream. Attach a receiver flask with a side-arm receiver adapter which is protected by means of a calcium chloride guard tube. Distil [sic] the ethanol gently discarding the first 20 ml of the distillate. Preserve the absolute ethanol (99.5%) in a bottle with a well fitting stopper.
Click to expand...

99.8% ethanol can also be achieved, and its drying procedure can be retrieved from the same source.
 
So here's the magnesium alkoxide (magnesium/iodine) method for preparing ultra-dry ethanol:

"Add magnesium (5 g) to 50 mL alcohol in a 2 L round bottomed flask. Add 0.5 g of iodine and heat to reflux until the iodine color has disappeared. Be ready to remove the source of heat if the reaction becomes too vigorous. Make up the mixture to 1 L with alcohol and reflux for 1/2 h with protection from the atmosphere. Distil and use the dry alcohol immediately."

This also works for methanol and propanols. From Harwood and Moody, "Experimental Organic Chemistry", Blackwell Science 1989-1996, p.743.
 
benzyme, im pretty sure this guy is trying to do the cannabis alchemist's isomerization tek. IIRC the alchemist states a 5% solution of h2so4 +hash oil in anhydrous ethanol refluxed for 9hrs or so. i cant find my pdf tho so i may be remembering wrong. i also remember reading on bl or the collective that it wont work with sulfuric unless a proper catalyst is used or something. i really cant remember.
 
ah, then i dunno why the OP would want thit for that stated reason. unless he needs it for 1-aco-thc production which does require it but falls beyond out locally allowed speach on synth.
 
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