I have done this with all metal reel seats by placing the reel seat in boiling water for a few minutes to soften the epoxy that is holding it on. I still had to pull pretty hard and twist to get it to come off. If the reel seat has a wooden insert that you don't want to damage, I would put it in a plastic bag or aluminum foil before boiling it. The heat may still damage the finish on the wood.

If you are trashing the butt section of the rod, you can also saw the butt section off an inch or so above the reel seat and drill it out.

Ted