Abstract: Sweetening of hydrogen-sulfide polluted liquids such as water and those whose viscosity is not substantially greater, is accomplished in upright tanks of constant cross-section, which are substantially conventional except for man-way provisions which permit clean-out and replacement of contents. Each tank, which has a liquid inlet provision near its bottom, is divided by its contents into three sections: a lowermost turbulence-eliminating section, an intermediate reacting section, and an uppermost tranquil purified storage section. Increase in capacity to fill a constant demand is attained by simply increasing the depth of the reacting section, to the lessening of the purified reserve.

Abstract: Bloated minerals previously used as aggregates for light-weight concrete are here fragmented, wetted, and intermixed with particulate chemical reactants or catalysts, to serve as inert carriers therefor in industrial processes. One use is in the deep-bed flow-through process of reacting and removing hydrogen sulfide as contained in natural gas.