This is propably an angels mods petrochem issue.

In this mod pack it is "very difficult" to produce enough oxygen in a reasonable way to produce sulfur-dioxyide.
No electrolysis is no reasonable way to produce oxygen!(electrolysis would be like putting your car onto a truck and the truck onto a train to drive to work with youre car)

The Air intake uses way to much time(6) to produce compressed air(10).
Its like 6 huge Air intakes-1(5x5) to supplay one chemical plant-2(basegame).
Pollution and energy need for compressed air is huge too.