Yeah, there's a Paulaners. For some reason, their beer is considerably more expensive than at the Airbräu at MUC.

Pro tip on the train ticket: Purchase yourself a ticket from Frankfurt central station to Brussels with a connection at FRA. The price is going to be exactly the same 99% of the time. However, the extra train increases the chance that the DB give you a "complimentary upgrade" to a flex ticket. DB is terribly unpunctual so you want to give them more opportunities to screw up. Of course, you do not need to take the segment Frankfurt Central Station to FRA. You can just use ICE316 (or any other train if DB obliges and removes the specified-train only requirement).