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Topic: using a ice bath for re fluxing column  (Read 276 times)

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Offline CrazyGoat

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using a ice bath for re fluxing column
« on: January 11, 2021, 04:50:45 AM »

 Hello,

 For cooling the reflux column I have seen 2 ways.
 One is with tap water, you connect the hose to the tap and let it running while the reaction lasts. 
 Another is using a recirculating chiller.

 My question is about not using either but is very similar to the recirculating chiller (which I can't afford at this moment)

 It would be for refluxing a solution of DCM or n-hexane.

 My idea is, putting ice in a barrel and using a pump. (and obviously recirculate that water)

 I do this because the reaction may last days and I don't want to expend that amount of water nor ethically or economically...

 Before you tell me the water will heat up quickly I have to tell you that I will let the barrel in the outside, making the hose go through the window, and currently is snowing.

 Maybe this works for the DCM but not the hexane?

 Thank you!!

Offline rolnor

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Re: using a ice bath for re fluxing column
« Reply #1 on: January 11, 2021, 06:28:57 AM »
I think that will work just fine. I use a cooling-device designed for aquarium and circulate the coolingwater i use for my rotavapor through that. But is there really any idea to reflux DCM, the bp is so low?

Offline CrazyGoat

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Re: using a ice bath for re fluxing column
« Reply #2 on: January 11, 2021, 06:50:28 AM »
Yes, that is because I talk about days, it will be really slow-cooked. And even trying the reaction to room temp I would lose the material by evaporation so making the reflux at least let you not losing material.

thank you for your answer.

Offline rolnor

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Re: using a ice bath for re fluxing column
« Reply #3 on: January 11, 2021, 08:13:11 AM »
You can use a stopper on the flask, then it does not evaporate? You can also heat the flask carefully without the reflux condenser.

Offline CrazyGoat

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Re: using a ice bath for re fluxing column
« Reply #4 on: January 11, 2021, 10:39:25 AM »
yes, but probably I will go with the hexane.

thank you.

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