1 reply to this topic

[JEBradley]

I believe nearly all sulphuric acid production is still made using the contact process. Just do a google search to see how this works.

You seemed to be asking about proprietary differences between different companies producing Sulphuric acid. Im afraid I cant help on this point - maybe check patents.

There are a few ways of concentrating sulphuric acid. Acid can be concentrated upto something like 90% boiling off vapours under vacuum.

You could use distillation to get more concentrated - but there is an azeotrope formed somewhere.

Rather than azeotropic distillation it is easier to absorb SO3 in a falling stream of H2SO4. This will produce battery-grade acid at around 99.5% (and this is essentially the contact process).

Dont know if this has really helped but hopefully someone else will step in and put me right