I've got a very rudimentary Chemistry background, so I'm not sure how much help I'll be, but:
If I could nab some of that Hydrogen output and get pure Nitrogen, it's possible to make Ammonia. So Hydrogen + (some nitrogen source - atmosphere, etc.) = Ammonia. Now that ammonia is highly alkaline it could be one of those strong Alkali reagents, or be utilised in something like Fertiliser.
Burning stuff in a generator or furnace produces CO2, right? Well, pump that into a reactor unit to lower the pH.
A few more ideas: Producing rubber, fuel, dyes etc. is all common usage in the industry.