Salt will react with some things that sugar will not react with: Dissolved salt 
is sodium ions and chloride ions, while sugar remains a nice intact molecule.  
So you get your molecular sieve (filtering does work, you just need a finer 
filter).

If you could find something that reacts with salt to produce an insoluble 
precipitate, that would work. Sodium salts, though are notoriously soluble, as 
are chloride salts.

Or, you electrolyze the mixture: the chlorine comes off as a gas, the sodium 
turns into sodium hydroxide (hydrogen comes off the other electrode): the sugar 
just stays there.  Now you have a mixture of sodium hydroxide and sugar, and 
maybe that's more easily separable.

Or, you use the fact that they crystalize out of solution at different 
concentrations.. you evaporate it in a thin dish, and the resulting solids will 
be partially separated.

Or you use differential freezing (same as evaporating, really)

If you don't need to actually recover the sugar, you could heat it up until the 
salt melts: the sugar will decompose and leave carbon behind, bubble oxygen 
through the molten mixture and the C will get burned off as CO2. 

And, then, there's another approach: add yeast to the solution, which will 
digest the sugar making alcohol.  And wouldn't you really rather have alcohol 
with salt?  Add lime juice and you're all set.



Jim

-----Original Message-----
From: John Hearns [mailto:[email protected]] 
Sent: Friday, March 11, 2016 7:59 AM
To: 'C Bergström' <[email protected]>; Justin Y. Shi <[email protected]>
Cc: Lux, Jim (337C) <[email protected]>; [email protected]
Subject: RE: [Beowulf] [OT] MPI-haters

> - either magically inside the compiler and or explicitly via source 
> syntax sugar.. However, resolving them is only half the battle
> - keep it all high performance is the other half. (reducing data
> movement/locality) so lets not mistake salt for sugar..


Disclaimer - I am not a chemist.
How WOULD one separate salt from sugar?  Let's have some inventive ideas.
Forgive me of this is in Chemistry 101 and is an easy undergraduate problem.

Both are water soluble, so there is no point in dissolving one and filtering 
out the solid part.
Is there a solute which acts on sugar but not on salt  (let's say common table 
salt and sucrose crystals for arguments sake).

Or do we ned a sophisticated Rube Goldberg machine which sends drops a stream 
of single crystals through a laser scanner which is then followed by an 
ultrafast air-blast kicker to sort the crystals into separate hoppers.


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