How can I disconnect this sprayer hose?

I would try vise grip pliers.

If there are no flats spots on the chrome articulated hose's fitting to accept a wrench then i would use a cloth and vise grip pliers to clamp onto the chrome fitting. ( wrap the cloth around the fitting to protect it from the jaws of the pliers )

Try to clamp onto the ring of thicker metal closest to the brass fitting side of the braided hose. Try a not to tight grip first and see if it spins. Tighten up the vise grips if the spins.

Once the vise grip pliers are clamped you can use an adjustable wrench on the brass fitting to see if you can loosen the connection.

If you do not care about the finish of the chrome then do not use the towel.

FYI: Vise Grip is a brand name that is commonly use to describe all locking pliers.