Draeger
Hazard to Others
Posts: 185
Registered: 31-1-2020
Location: North-Rhine Westfalia, Germany
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Mood: Slowly getting ready for new projects
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Preventing flowback without inverse funnel trap or extra container?
I thought that maybe I'd buy two flasks, a hose adapter and a gas insertion tube. I'm worried about flowback, but I would like to avoid buying another
flask.
Is there any other way to prevent flowback?
Collected elements:
Al, Cu, Ga, C (coal), S, Zn, Na
Collected compounds:
Inorganic:
NaOH; NaHCO3; MnCl2; MnCO3; CuSO4; FeSO4; aq. 30-33% HCl; aq. NaClO; aq. 9,5% ammonia; aq. 94-96% H2SO4; aq. 3% H2O2
Organic:
citric acid, sodium acetate, sodium citrate, petroleum, mineral oil
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Syn the Sizer
National Hazard
Posts: 591
Registered: 12-11-2019
Location: Canada
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I like to have a middle bottle. I do realize it means you need 1 more flask but even with an inverted funnel you can still get suck back even if it's
not very common. It happened to Tom on his Extractions and Ire channel ruining his nitric acid. A middle bottle catches the accidental suck back
before it ruins your product. I use a 2 neck flask with 2 single hole rubber stoppers and glass tubes. I understand for some applications rubber is
not good, such as dealing with HNO3 vapours but it works in a pinch.
That is my best suggestion to prevent suck back into your product, short of watching like a hawk and catching it before it happens. I realize you are
looking for another fix.
[Edited on 5-7-2020 by Syn the Sizer]
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Draeger
Hazard to Others
Posts: 185
Registered: 31-1-2020
Location: North-Rhine Westfalia, Germany
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Mood: Slowly getting ready for new projects
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Quote: Originally posted by Syn the Sizer  | I like to have a middle bottle. I do realize it means you need 1 more flask but even with an inverted funnel you can still get suck back even if it's
not very common. It happened to Tom on his Extractions and Ire channel ruining his nitric acid. A middle bottle catches the accidental suck back
before it ruins your product. I use a 2 neck flask with 2 single hole rubber stoppers and glass tubes. I understand for some applications rubber is
not good, such as dealing with HNO3 vapours but it works in a pinch.
That is my best suggestion to prevent suck back into your product, short of watching like a hawk and catching it before it happens. I realize you are
looking for another fix.
[Edited on 5-7-2020 by Syn the Sizer] |
Ah. Well, it's rather since I can't find flasks for under 10€ so 3 flasks are more than 30€, and that would just be the flasks, so that would be
quite expensive, and I really don't like ordering from China since I'm impatient.
Collected elements:
Al, Cu, Ga, C (coal), S, Zn, Na
Collected compounds:
Inorganic:
NaOH; NaHCO3; MnCl2; MnCO3; CuSO4; FeSO4; aq. 30-33% HCl; aq. NaClO; aq. 9,5% ammonia; aq. 94-96% H2SO4; aq. 3% H2O2
Organic:
citric acid, sodium acetate, sodium citrate, petroleum, mineral oil
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outer_limits
Hazard to Others
Posts: 139
Registered: 3-3-2020
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Mood: hybridized
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You can use filtration flask if you own one, depending of course on it's volume and predicted volume of possible flowback.
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SWIM
National Hazard
Posts: 970
Registered: 3-9-2017
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These polypropylene check valves are cheap.
https://www.ebay.com/itm/3-8-8MM-Plastic-One-Way-Inline-Chec...
One in the line to prevent flow-back, or one as a vent to prevent the vacuum which causes flow-back?
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Refinery
Hazard to Others
Posts: 371
Registered: 17-2-2014
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Mood: Still
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PP check valves are a good option.
If you're in a hurry, basically any bottle or flask can serve if you get some sort of closure to it. Even as rudimentary as PE packing foil can do. I
have a couple of rubber and silicon plugs which I have drilled two holes in. They are a bit tricky to drill, but it works. The drill partially cuts
and partially grinds the rubber/silicon away.
Compatibility is not such an issue if the parts are small and the exposure is only temporary, like few hours at max. The guy that made ketene lamp in
youtube used rubber plugs and although it is totally not compatible, it works for the small time. For materials especially suitable for storage it is
very important because exposure is infinite.
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Boffis
International Hazard
Posts: 1836
Registered: 1-5-2011
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Mood: No Mood
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Whats wrong with the good old inverted funnel? I use this method all the time with both chlorine and ammonia. I recently inlustrated the use of a
gooch adapter type funnel (ex Ebay) for the preparation of alcoholic ammonia.
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Draeger
Hazard to Others
Posts: 185
Registered: 31-1-2020
Location: North-Rhine Westfalia, Germany
Member Is Offline
Mood: Slowly getting ready for new projects
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| Quote: Originally posted by Boffis | | Whats wrong with the good old inverted funnel? I use this method all the time with both chlorine and ammonia. I recently inlustrated the use of a
gooch adapter type funnel (ex Ebay) for the preparation of alcoholic ammonia. |
It wouldn't have worked in my case since I needed a closed system to prevent anything toxic to be released since my area isn't ventilated.
I'm not going to be able to buy from the supplier I originally wanted to buy from anyway, though, so I'm just going to try and buy 3 flasks.
Thanks everyone for the replies.
Collected elements:
Al, Cu, Ga, C (coal), S, Zn, Na
Collected compounds:
Inorganic:
NaOH; NaHCO3; MnCl2; MnCO3; CuSO4; FeSO4; aq. 30-33% HCl; aq. NaClO; aq. 9,5% ammonia; aq. 94-96% H2SO4; aq. 3% H2O2
Organic:
citric acid, sodium acetate, sodium citrate, petroleum, mineral oil
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draculic acid69
International Hazard
Posts: 1371
Registered: 2-8-2018
Member Is Offline
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| Quote: Originally posted by Refinery | PP check valves are a good option.
If you're in a hurry, basically any bottle or flask can serve if you get some sort of closure to it. Even as rudimentary as PE packing foil can do. I
have a couple of rubber and silicon plugs which I have drilled two holes in. They are a bit tricky to drill, but it works. The drill partially cuts
and partially grinds the rubber/silicon away.
Compatibility is not such an issue if the parts are small and the exposure is only temporary, like few hours at max. The guy that made ketene lamp in
youtube used rubber plugs and although it is totally not compatible, it works for the small time. For materials especially suitable for storage it is
very important because exposure is infinite. |
I tried drilling rubber bungs and I've heard that it's best to freeze them first.
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Eddie Current
Hazard to Self
Posts: 78
Registered: 25-7-2018
Member Is Offline
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| Quote: Originally posted by Draeger | I thought that maybe I'd buy two flasks, a hose adapter and a gas insertion tube. I'm worried about flowback, but I would like to avoid buying another
flask.
Is there any other way to prevent flowback? |
I recommend these multi size two hole silicon stoppers if you can find them. They cost me around $7-8 each and can be utilised with teflon tubing and
suitable bottles as gas scrubbers for the hobbyist.
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