I’m reading about 19th century preparations of propylene bromide,
butylene bromide and amylene bromide, which involve heating sodium
acetate with "chaux soude" (sodium carbonate?) and passing the gases
that arise through bromine and then through "lessive de soude". One
gets the various bromides by controlling the temperature: propylene
bromide at 145 degrees (I don’t know on what scale); butylene bromide
around 160 degrees; amylene bromide around 175-180 degrees.
Am I correct in thinking that "lessive de soude" refers to soap made from
sodium hydroxide and animal fat? If so, is the "lessive de soude" stage
actually dishwater? If not, what is it and in what form? And why would
one use soap at that stage?
—
Ignorantly,
Allan Adler <a…@zurich.csail.mit.edu>
* Disclaimer: I am a guest and *not* a member of the MIT CSAIL. My actions and
* comments do not reflect in any way on MIT. Also, I am nowhere near Boston.
Allan Adler a écrit dans le message …
- Hide quoted text — Show quoted text -
>I’m reading about 19th century preparations of propylene bromide,
>butylene bromide and amylene bromide, which involve heating sodium
>acetate with "chaux soude" (sodium carbonate?) and passing the gases
>that arise through bromine and then through "lessive de soude". One
>gets the various bromides by controlling the temperature: propylene
>bromide at 145 degrees (I don’t know on what scale); butylene bromide
>around 160 degrees; amylene bromide around 175-180 degrees.
>Am I correct in thinking that "lessive de soude" refers to soap made from
>sodium hydroxide and animal fat? If so, is the "lessive de soude" stage
>actually dishwater? If not, what is it and in what form? And why would
>one use soap at that stage?
>–
>Ignorantly,
>Allan Adler <a…@zurich.csail.mit.edu>
>* Disclaimer: I am a guest and *not* a member of the MIT CSAIL. My actions
and
>* comments do not reflect in any way on MIT. Also, I am nowhere near
Boston.
A solution of sodium hydroxide is sometimes sold (in France) under the
name lessive de soude .
Some however may use the term for washing soda ( sodium carbonate):
http://fr.ekopedia.org/Lessive
"Ne pas confondre le nom chimique lessive de soude (solution de soude
caustique) et la lessive pour le linge qui contient du carbonate de sodium
(ou cristaux de soude de formule Na2CO3)."
JL
"Allan Adler" <a…@nestle.csail.mit.edu> wrote in message
news:y933aypxb2o.fsf@nestle.csail.mit.edu…
- Hide quoted text — Show quoted text -
> I’m reading about 19th century preparations of propylene bromide,
> butylene bromide and amylene bromide, which involve heating sodium
> acetate with "chaux soude" (sodium carbonate?) and passing the gases
> that arise through bromine and then through "lessive de soude". One
> gets the various bromides by controlling the temperature: propylene
> bromide at 145 degrees (I don’t know on what scale); butylene bromide
> around 160 degrees; amylene bromide around 175-180 degrees.
> Am I correct in thinking that "lessive de soude" refers to soap made from
> sodium hydroxide and animal fat? If so, is the "lessive de soude" stage
> actually dishwater? If not, what is it and in what form? And why would
> one use soap at that stage?
> —
> Ignorantly,
> Allan Adler <a…@zurich.csail.mit.edu>
> * Disclaimer: I am a guest and *not* a member of the MIT CSAIL. My actions
> and
> * comments do not reflect in any way on MIT. Also, I am nowhere near
> Boston.
It looks like lessive du soude is translated as sodium hydroxide in water,
or a causic solution. I think chaux soude would be sodium carbonate.
(sodium lime or sodium chalk)
Michael
"Allan Adler" <a…@nestle.csail.mit.edu
|
| I’m reading about 19th century preparations of propylene bromide,
| butylene bromide and amylene bromide, which involve heating sodium
| acetate with "chaux soude" (sodium carbonate?) and passing the gases
| that arise through bromine and then through "lessive de soude". One
| gets the various bromides by controlling the temperature: propylene
| bromide at 145 degrees (I don’t know on what scale); butylene bromide
| around 160 degrees; amylene bromide around 175-180 degrees.
|
| Am I correct in thinking that "lessive de soude" refers to soap made from
| sodium hydroxide and animal fat? If so, is the "lessive de soude" stage
| actually dishwater? If not, what is it and in what form? And why would
| one use soap at that stage?
| —
| Ignorantly,
| Allan Adler <a…@zurich.csail.mit.edu>
|
———-
MIT doesn’t have a library? Strange.
Augustin Patterson’s A French English Dictionary for Chemists sez:—
chaux – lime
soude – soda (presumable carbonate)
lessive – lixicium; lye; washing; bucking; wash -de soude brute or douce), (soap)
a lye made by lixiviating a mixture of sodium carbonate and (as black ash) and slaked
lime.
–
donald j haarmann
—————————
The Chymists are a strange Class of Mortals, impelled
by an incomprehensible Impulse to take their Pleasure
amid Smoke and Vapour, Fume and Flame, Poison and
Poverty – Yet among all these Evils, I seem to live so
sweetly that may I die if I would change places with the
Persian King!
Johann Beccher
Physica Subterranea, 1703