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Around the Cape you go when you catalyze the hydrolysis of ethylene oxide to ethylene glycol by ordinary acids. The acidic catalyst must be neutralized, and the salt formed must be precipitated. Filtration of the eth ylene glycol must be carried out—and still traces of salt must be removed! When AMBERLITE IR-120, a resin that behaves like a strong acid with only its hydrogen ions in solution, catalyzes the reaction, there is no neutralization, no formation ofccnlaminating inorganic salts, no filtration—and no troublesome trace of corrosive salt.
Catalysis b y Acid- and Base-Form Amberlite Ion Exchange Resins W h e n you need a source o f hydrogen or hydroxyl ions to catalyze a reaction, why use soluble acids and alka lies that turn u p like bad p e n n i e s in the final product? That require neutralization—then call for nitration o f the salt that neutralization produces? There's an AMBERLITE t o fit every acid-base cata lytic need: the strongly-acidic AMBERLITE IR-lO0,IR105, IR-120; the weakly-acidic IRC-50; the stronglybasic AMBERLITE IRA-400; the weakly-basic IR-4B. With only their hydrogen or hydroxyl ions in solution, these resins cannot contribute unwanted ions o r form undesirable by-products. If, for instance, nicotinonitrile is your starting point and nicotinamide your goal, then AMBERLITE I R A - 4 0 0 is your catalyst if you would avoid contamination by conventional alkaline catalysts, a reduction in yield caused by the formation of un wanted nicotinic acid, and tedious fractional separation
of nicotinamide from nicotinic acid. W^hy take the long way 'round an aldol condensa t i o n a Cannizzaro reaction? an esterifi cation? an acetal formation? For these and scores of reactions that require acidic or basic catalysis, why not borrow hydrogen or hydroxyl i o n s from the AMBERLITES—insoluble sources that ^von't encourage s*ide reactions or lead you around theGapeof neutralizations, precipitations, and filtrations. For the how, w h a t , and w h y of ion exchange. . . · For oz description of the process, an extensive bibliography, and details on the nse of the Amberlites in water con· ditiojezng and scores of industries, re quest a copy of the July issue of The Resinous Reporter.
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