wakatutu
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Registered: 23-2-2017
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Filtering Hydroxide solution
Hi everybody!
I realize this is probably a topic already covered here, but using the search engine on such a basic thing rewards me with every topic on the site!
I'm having a difficult time filtering an aqueous solution of mixed lipophilic organic acids in excess hydroxide. Vacuum filtration induces foaming
and an emulsifying of layers which is diffuse throughout the solution. This is probably OK but it is a hassle to deal with the foaming.
Gravity filtration takes longer than I want to spend doing it, though it is very effective.
Is there a better solution to this problem?
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happyfooddance
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So you have soap that's basic, am I correct?
If that is the case then I have also experienced your frustration with this. It is extremely difficult (and time consuming) to break the emulsions
that form. Pulling a vacuum and removing dissolved gasses can help with emulsions, but it doesn't work in this case because you just get froth sucked
into your pump.
Gentle heating and stirring are also pretty useless here.
For what it's worth, the emulsions are a little better when the solution is made acidic: that is, after the initial (almost) unavoidable evolution of
fine CO2 bubbles...
I too, would like a good solution for my application.
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vmelkon
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This has been a problem for me as well. Perhaps a bubble popper would help. I would have to build one.
I have seen some chemists has something to reduce the foaming in some cases.
Signature ==== Is this my youtube page? https://www.youtube.com/watch?v=tA5PYtul5aU
We must attach the electrodes of knowledge to the nipples of ignorance and give a few good jolts.
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SWIM
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There are a lot of soaps that just won't foam in salt water.
Don't know exactly what you're doing here, but would salting the solution before filtering be feasible?
Forcing the liquid through the filter under pressure instead of sucking it through might solve a lot of your problems if you can rig that up somehow.
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