NOVELTY - A hydrogen separation unit, preferably hydrogen separation membrane module (400), comprises planar base having solid extensions reaching inward from at least side wall of the base forming a hollow region of channels; surface coated perforated plates; planar hydrogen separation membranes in fluid communication with each other, such that membranes have shared environment; and frames. The separation unit has array mechanisms in a shared environment.    USE - A hydrogen separation unit, preferably hydrogen separation membrane module, for fuel cell.    ADVANTAGE - The unit yields an efficient and low cost supply of pure hydrogen; is compact, lightweight, and scalable; uses low cost fabrication and assembly processes; and can be utilized in a variety of configurations (320) inside membrane reformers, including an array configuration.    DETAILED DESCRIPTION - Hydrogen separation unit, preferably hydrogen separation membrane module (400), comprises planar base with a top, bottom and outer side wall, and having solid extensions reaching inward from at least side wall of the base forming a hollow region of channels that is fluidly connected to outlet port; surface coated perforated plates; planar hydrogen separation membranes in fluid communication with each other, such that membranes have shared environment; and frames. Each perforated plates is disposed on corresponding top and bottom of base and between base and corresponding hydrogen separation membranes. Each hydrogen separation membranes is disposed between a corresponding perforated plates or frames. The separation unit has array mechanisms in a shared environment. INDEPENDENT CLAIMS are included for:    (1) a method of producing and separating high purity hydrogen; and    (2) a method of sealing planar mechanism in a hydrogen separation unit.    DESCRIPTION OF DRAWING(S) - The drawing is a cross sectional diagram of membrane module array and membrane reformer configurations.    Combustion chamber (310)    Configuration (320)    Hydrogen separation membrane module (400)