TL;DR
Remove the overly complex and wasteful steps required to take sulphuric acid back to sulphurWhat?
Add a recipe allowing sulphuric acid to be distilled into solid sulphur. A secondary byproduct could be water, steam, or heavy oil - or none at all.Why?
If you're doing science on Vulcanus (for example, with a Vulcanus start), you need sulphur for blue science. Obtaining this requires coal liquefaction (either method) to create heavy oil and petroleum oils, then combining petroleum with water to make sulphur. In theory you can loop this back to adding iron and more water to make sulphuric acid. It would be logical to allow separation of sulphuric acid back into sulphur.It removes complexity but in a way that is logical.