Re: A newbie's Hello world!

onehappymadman@xxxxxxxxx wrote:
> Robert wrote:
<snip>
>
> I noticed you mentioned you want to purify caffeine. Be very careful
> here, especially if you intend to eat your product. Notice that many
> of the cheaper chemicals are cheap because they're not very pure. You
> might get poisonous by-products from chemicals you buy if you don't
> specify food-grade chemicals. Off the top of my head, one example is
> sodium hydroxide (NaOH) - if I remember correctly, one method of
> manufacture involves mercury electrodes, so this NaOH would have
> traces of mercury present. Very Bad. And then there's ethanol made
> from distillation with benzene...

Good advice - as one who works for a catalogue company - we state in the
catalogue that our products are for R&D only, they are not "food grade", not
"kosher", not "GMP", or any of the similar types of "edible" items. We buy
from various sources, we make from various starting materials by various
routes. We do not keep any of those constant, but are led by market forces.
We would only fix a route when it's a custom item made for a particular
customer.

--
--
Ron Jones
Process Safety & Development, Alfa Aesar.

Don't repeat history, see unreported near misses in chemical lab/plant
at http://www.crhf.org.uk
Only two things are certain: The universe and human stupidity; and I'm
not certain about the universe. ~ Albert Einstein


.

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