Steam hydrocarbon reforming is the process most commonly used today for the production of pure hydrogen on a large scale. Steam hydrocarbon reforming was first introduced in the late 1930’s. As practiced then, the process was operated at close to atmospheric pressure. It was not until 1953 that reforming pressure was increased. Two plants were built at that time operating with an outlet pressure of 35 psig and 75 psig, respectively. Since then, pressures have been continually increased in steps to over 400 psig today. These increases in pressure have been made possible by the development of better alloys.

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