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All 8 posts Subject: drying ether Please login to post Down

acx01b
(Newbee)
10-22-04 23:53
No 537221
      drying ether

hi what is the best way do dry C2H5-O-C2H5 ?
i purpose this: 30% H2So4 is boiled to get 50% H2SO4
50% H2SO4 (5ml) is added to 50ml of ether,
phases are mixed well.
ether layer is separated, and 0.5gram magnesium turnings are added, mixed well...

i purpose that the % of H2O will be 0.1% maximum.

Novice
(Hive Bee)
10-23-04 01:35
No 537237
      Dry Et2O using elemental alkali

If MgSO₄-dried ether isn't good enough for you, use either magnesium-, litium- or sodium turnings and stirring, then, when from what you can tell all the water present in the Et₂O has reacted, distill the ether.

Adding 50% H₂SO₄ will only make it worse than it already is.

acx01b
(Newbee)
10-23-04 15:30
No 537304
      nope mf, magnesium turnings wont dry it at...

MgSO4 dried ether is not dried: it still reacts with Na then...

nope mf, magnesium turnings wont dry it at all, maybe iodine + magnesium turnings but how to separate iodine from ether then ?

maybe by reacting iodine with MgO obtained by burning magnesium turnings... or any oxyde like CuO or something...

but iodine is not cheap, and instead of using iodine why not use sodium.. whereas my post was how to dry ether without NaH NaO Na NaNH2...

what about the electrolysis of melted NaOH ? is it hard to produce Na (inert gaz needed because Na melted reacts violently with O2 in air)
what about using desoxygenated Air (O2 --> CO2) as the inert gaz ?

cya

indole_amine
(Hive Bee)
10-24-04 02:14
No 537405
User Picture       mol sieves

Molecular sieves. Residual water is 0.0001 percent by volume - "Analytical grade" water absence... smile

_{indole_amine}

acx01b
(Newbee)
10-28-04 00:58
No 538218
      Just to say (i learnt it today) that Conc.

Just to say (i learnt it today) that Conc. sulphuric acid won't work to dry ether by only mixing the 2 at room temp... for the simple reason that ether and conc sulphuric acid (80% i tried) have good miscibility together!

Novice
(Hive Bee)
10-28-04 01:24
No 538225
      80% sulphuric acid contains more water than...

80% sulphuric acid contains more water than it contains sulphuric acid, which is to say, it won't react with any additional water.

There is only H₂O, HSO₄^- and H₃O⁺ in it, and as far as I know HSO₄^- isn't that strong an acid. At least not strong enough to bind the reast of the water.

If 80% sulphuric acid would work to dry ether with, it wouldn't have mattered if they were miscible or not, as you still have to distill the ether when you're done (leaving H₂SO₄ and H₂O behind).

acx01b
(Newbee)
10-28-04 03:53
No 538246
      so close to have free H2SO4 in it!

so close to have free H2SO4 in it!
density of 80% h2SO4 : 1.7, in 1L of 80% H2SO4
1360grams of H2SO4 (13.87mol) and 340grams of H2O (18.8 mol)

I just calculated that since 85% H2SO4 water solution begins to have free H2SO4 in it

i am gonna redirect myself on powdered CaO, that i hope will react (why would it not react ?)

Novice
(Hive Bee)
10-28-04 11:37
No 538304
      CaO might work for drying ether, yes.

CaO might work for drying ether, yes. I don't think it's as effective as elemental alkali though. Just don't try and dry the sulphuric acid with CaO :-}

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	All 8 posts		Subject: drying ether		Please login to post		Down


		acx01b (Newbee) 10-22-04 23:53 No 537221				drying ether
						hi what is the best way do dry C2H5-O-C2H5 ? i purpose this: 30% H2So4 is boiled to get 50% H2SO4 50% H2SO4 (5ml) is added to 50ml of ether, phases are mixed well. ether layer is separated, and 0.5gram magnesium turnings are added, mixed well... i purpose that the % of H2O will be 0.1% maximum.



		Novice (Hive Bee) 10-23-04 01:35 No 537237				Dry Et2O using elemental alkali
						If MgSO₄-dried ether isn't good enough for you, use either magnesium-, litium- or sodium turnings and stirring, then, when from what you can tell all the water present in the Et₂O has reacted, distill the ether. Adding 50% H₂SO₄ will only make it worse than it already is.



		acx01b (Newbee) 10-23-04 15:30 No 537304				nope mf, magnesium turnings wont dry it at...
						MgSO4 dried ether is not dried: it still reacts with Na then... nope mf, magnesium turnings wont dry it at all, maybe iodine + magnesium turnings but how to separate iodine from ether then ? maybe by reacting iodine with MgO obtained by burning magnesium turnings... or any oxyde like CuO or something... but iodine is not cheap, and instead of using iodine why not use sodium.. whereas my post was how to dry ether without NaH NaO Na NaNH2... what about the electrolysis of melted NaOH ? is it hard to produce Na (inert gaz needed because Na melted reacts violently with O2 in air) what about using desoxygenated Air (O2 --> CO2) as the inert gaz ? cya



		indole_amine (Hive Bee) 10-24-04 02:14 No 537405				mol sieves
						Molecular sieves. Residual water is 0.0001 percent by volume - "Analytical grade" water absence... _{indole_amine}



		acx01b (Newbee) 10-28-04 00:58 No 538218				Just to say (i learnt it today) that Conc.
						Just to say (i learnt it today) that Conc. sulphuric acid won't work to dry ether by only mixing the 2 at room temp... for the simple reason that ether and conc sulphuric acid (80% i tried) have good miscibility together!



		Novice (Hive Bee) 10-28-04 01:24 No 538225				80% sulphuric acid contains more water than...
						80% sulphuric acid contains more water than it contains sulphuric acid, which is to say, it won't react with any additional water. There is only H₂O, HSO₄^- and H₃O⁺ in it, and as far as I know HSO₄^- isn't that strong an acid. At least not strong enough to bind the reast of the water. If 80% sulphuric acid would work to dry ether with, it wouldn't have mattered if they were miscible or not, as you still have to distill the ether when you're done (leaving H₂SO₄ and H₂O behind).



		acx01b (Newbee) 10-28-04 03:53 No 538246				so close to have free H2SO4 in it!
						so close to have free H2SO4 in it! density of 80% h2SO4 : 1.7, in 1L of 80% H2SO4 1360grams of H2SO4 (13.87mol) and 340grams of H2O (18.8 mol) I just calculated that since 85% H2SO4 water solution begins to have free H2SO4 in it i am gonna redirect myself on powdered CaO, that i hope will react (why would it not react ?)



		Novice (Hive Bee) 10-28-04 11:37 No 538304				CaO might work for drying ether, yes.
						CaO might work for drying ether, yes. I don't think it's as effective as elemental alkali though. Just don't try and dry the sulphuric acid with CaO :-}

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