and from where appear Fe, Hg, As... impurities???Texium - 11-10-2022 at 06:08
They don’t. When HCl is made it’s extremely pure. In the case of laboratory/pharma or food grade stuff, it generally stays that way. If there’s
iron impurities in technical grade stuff, it will have been introduced by how it was handled in the factory: possibly transferred through pipes or
stored in tanks that are not impervious to HCl, and allow a small amount of iron to enter the solution. As for mercury and arsenic, I’ve got no clue
why you’d think to suspect those as contaminants.pneumatician - 11-10-2022 at 06:44
Because I read the "Certificate of Analysis"???
I expected a reply like this... I think people in factories not are so stupid to run megapure HCL through rusted iron pipes, or no?
ridiculous quantities but from where come from near all the periodical table of elements here???unionised - 11-10-2022 at 14:01
Dust; the glass from which the bottle is made, all sorts of things.
It's very difficult to maintain that degree of purity and, therefore, very expensive.
If your customer doesn't care if there's a little iron in the product then why not use steel equipment- it's cheap.
More realistically, you use equipment that's made of glass or plastic.
But those were moulded in steel.
Incidentally, cheap HCl is made as a by-product of chlorination of organics (e.g. making CH2Cl2) or from the reaction of salt with sulphuric acid.
Tsjerk - 12-10-2022 at 03:26
The reaction containers used to burn hydrogen with chlorine are made out of either iron or titanium. They could probably be made out of something that
doesn't contaminate the HCl, but apparently changing the reaction chamber by the time it is degraded, and distillation of the acid when needed for
purity is cheaper.
