I’d say not, or at least not without difficulty.
You can use steam to loosen glue joints, which basically heats up the joint, which can be knocked apart, but even once its in bits, it cannot simply be glued back together without removing all the old glue.
Plus on reassembly, you would need to clamp it up and its more than likely in the factory, they’d have used jigs and fixtures to hold the misshapen and curved components while the glue goes off. Recreating all that would be difficult at best, unless you’re experienced in that type of thing, and have the equipment, timber etc.
All in all you might end up with a pile of components, and what was once a usable chair, is now a pile of scrap wood.
Given the price of some Ercol chairs in the market(£300+ for that type) i would just leave it where it is.
Unless of course it needs to go, in which case have you an axe ?