From: Deepak Shukla (DEEPAK.SHUKLA2$##$ranbaxy.com)
Date: Mon Feb 13 2006 - 22:21:50 EST
You may try any of these,
1.As Uno and Will jones have written use dry ice and Ethanol/ Acetone
with insulation.
2.Use low temperature baths with mineral oil/solvents like acetone +
methanol and you may use it for much longer time.Such baths are commonly
available.
3.Use liquid nitrogen as secondary cooling utility with insulation.
4.Its better to put Circulators as they avoid heat losses and reduce
evaporation losses wrt time to min.
Regards
Deepak
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Today's Topics:
1. reactions at -degrees temp (srinivas reddy)
2. RE: reactions at -degrees temp (will jones)
3. Re: reactions at -degrees temp (Uno Maeorg)
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Message: 1
Date: Mon, 13 Feb 2006 07:39:47 -0800 (PST)
From: srinivas reddy <gounisrinivas$##$yahoo.com>
Subject: ORGLIST: reactions at -degrees temp
To: everybody$##$orglist.net
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hi,
can anybody suggest how to do the reactions at minus degree
temperatures, for example (-70 degrees with dry
ice) but for long hours 3-4 hrs?.
thanks in advance
srinivas
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Message: 2
Date: Mon, 13 Feb 2006 16:01:05 +0000
From: "will jones" <willjones46$##$hotmail.com>
Subject: RE: ORGLIST: reactions at -degrees temp
To: gounisrinivas$##$yahoo.com, everybody$##$orglist.net
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In a thermos flask, (the flask for coffee)
If you need to continually cool a large flask, then dry ice in acetone
insulated with glass wool would do the trick.
>From: srinivas reddy <gounisrinivas$##$yahoo.com>
>To: everybody$##$orglist.net
>Subject: ORGLIST: reactions at -degrees temp
>Date: Mon, 13 Feb 2006 07:39:47 -0800 (PST)
>
>hi,
>
>can anybody suggest how to do the reactions at minus
>degree temperatures, for example (-70 degrees with dry
>ice) but for long hours 3-4 hrs?.
>
>thanks in advance
>
>srinivas
>
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Message: 3
Date: Mon, 13 Feb 2006 18:21:24 +0200
From: Uno Maeorg <uno$##$chem.ut.ee>
Subject: Re: ORGLIST: reactions at -degrees temp
To: srinivas reddy <gounisrinivas$##$yahoo.com>, everybody$##$orglist.net
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Hi,
Just put your flask in Dewar with dry ice/ethanol.
Regards
Uno
At 05:39 PM 2/13/2006, srinivas reddy wrote:
>hi,
>
>can anybody suggest how to do the reactions at minus
>degree temperatures, for example (-70 degrees with dry
>ice) but for long hours 3-4 hrs?.
>
>thanks in advance
>
>srinivas
>
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