Abstract
EXPERIMENTS at the Chemical Research Laboratory of the Department of Scientific and Industrial Research have led to the discovery that synthetic resins prepared from certain phenols and tunnins possess marked base-exchange properties. Some of these resins are capable of removing as much calcium and magnesium from hard water as an equal weight of the commercial water-softening materials with the highest base-exchange values. Other resins prepared from aromatic bases, such as aniline, possess the property of removing anions or acidic radicals from solution. By passing water through granules of the two classes of resins in separate tubes arranged in series, the salts in solution can be removed. For example, by treating city water first with a tannin resin and then with an aniline resin the solids in solution were reduced from about 33 parts to about 1 part per 100,000. The same process carried out two or three times removes most of the salt from sea ...
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