Pocket door would be problematic.... Would require slot of demolition and rebuilding wiring. From what I see here in the pictures provided there probably isn't enough wall space for a pocket door to slide into the wall. It appears as though you have about a 36 inch wide opening and if you're handy with tools, there would be plenty of room to install a hinged door from kitchen into laundry room.
The proper hinge side of door should be on left side of opening and swinging into laundry room with the doorknob on the right-hand side. However.... From the pictures provided it looks like the refrigerator would be in the way of the door knob. So the solution would be to hinge on right-hand side swinging into the laundry. This would only create issues primarily from a convenience perspective as you would opening the door across direction of travel towards the center of the laundry room instead of towards a perpendicular wall as is common.

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