chief
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Bleach from chlorate/chloride-brine
Supposed I have concentrated chlorate-chloride-brine at will, from electrolysis. But I frequently want chlorine-bleach, which somehow makes the drain
open, better than hot NaOH-solution can do.
How could I get me then the bleach (hypochloride) from the chlorate-brine, in a easy way ? HCl, NaOH and NaCO3 are given ..., but using H2SO4 would be
considered a wasture ...
Until now I always buy the chlorine-bleach, just to give it down the drain ...
[Edited on 7-3-2009 by chief]
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497
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Or you could just electrolyze brine directly to bleach...
Any way you do it, it's going to more expensive and much more effort than just buying some bleach... that stuff is *cheap.*
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chief
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Oh no, it's not cheap: 3 Bottles (regularly) make 5 bucks ; and only minimum quantities if the bleach-stuff inside (hypochloride) ;
whereas: The chlorate/chloride-solution I have anyhow, and 1 kg NaCl only costs 0.50 bucks, should give maybe 100 l of bleach ... ; definately cheaper
to use the self-made chlorate, if possible.
If I wanted to electrolyze NaCl, would I just add some Na2CO3 to stabilize the hypochloride and prevent decomposition to NaCLO3, or what ?
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hissingnoise
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Chief, bleach is hypochlorite, not hypochloride.
Brine electrolysis at low temperature produces concentrated hypochlorite---chlorine bubbled through a saturated NaOH solution again at low temperature
converts all the NaOH to NaClO.
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chief
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So once it became hot it's irreversible ?
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hissingnoise
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Yes, NaClO disproportionates to chlorate and chloride.
Bleach is ~5% NaClO in NaOH---high PH stabilises NaClO in solution.
It's the instability of NaClO that makes it an effective bleach.
But essentially you're paying for NaOH. . .
[Edited on 7-3-2009 by hissingnoise]
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tryptamine
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Electrolysis of brine produces chlorates at high temperatures, with digestion at 90C. Low temperatures produce hypo from the same setup.
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hissingnoise
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| Quote: | Originally posted by hissingnoise
Chlorine bubbled through a saturated NaOH solution again at low temperature converts all the NaOH to NaClO. |
I just spotted my error, sorry---half the NaOH is converted to NaClO---and half to NaCl. . .
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