Abstract
Excessive quantities of atmospheric sulfur dioxide (SO2) are environmentally problematic. One of the anthropogenic processes that release SO2 into the atmosphere is the contact process for the industrial manufacture of sulfuric acid (H2SO4). The progress of the idea to make use of “green vitriol” (FeSO4·7H2O) for “SO2-free” manufacture of H2SO4 is discussed here. The environmentally advantageous fact that the method, called “Geber's method,” can theoretically be “waste-free” is addressed in this “Comment,” and the challenge of having limited suitable resources of FeSO4·7H2O in the US for use as the starting material in “Geber's method” is emphasized.
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