The Dow Chemical Company

Herbert A Johnson

Lanny A Robbins

Robert J King

The present invention provides a process for separating a condensable gas from a non-condensable gas by switching at least three adsorber beds which preferentially adsorb the condensable gas serially through the following steps:

Recovery process

A method of drying hydrated crystalline magnesium sulfate to reduce its surface moisture content is disclosed. The method comprises: (a) fluidizing a bed of hydrated crystalline magnesium sulfate particles by continuously passing a heated gaseous medium in a generally upwardly direction through the particles at a superficial velocity at least sufficient to maintain turbulent fluidization and mixing of the particles throughout the bed; (b) transferring a dispersed form of hydrated crystalline magnesium sulfate to be dried into the fluidized bed; (c) maintaining the amount of crystalline magnesium sulfate within the fluidized bed at a constant depth; (d) controlling the temperature and relative humidity of the heated gaseous medium to maintain a bed temperature and humidity sufficient to vaporize at least a portion of the surface moisture from the hydrated crystalline magnesium sulfate without removing waters of hydration; and (e) removing dried hydrated crystalline magnesium sulfate from the bed.

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Midland, MI, United States of America

Herbert A Johnson