Montedison S.p.a.

Valentino Zamboni

Corrado Brichta

Claudio Troglia

Mario Padovan

Raymond Le Van Mao

Enrico Moretti

Marcello Solari

A process for synthetizing mordenites having a high catalytic activity, in which the SiO.sub.2 :Al.sub.2 O.sub.3 molar ratio ranges from 16 to 40, said process comprising the step of mixing an organic base with H.sub.2 O and with at least a Na compound, an Al compound, and a Si compound, wherein said base is a diethyl-piperidinium compound and wherein the crystallization temperature of mordenite and the SP factor are selected within area A B C D of FIG. 1, the crystallization time being longer than two days.

Process for synthetizing zeolites having a mordenite structure and

The kinetics of crystallization of high polymers from the molten state is modified by adding to the polymers before the thermoforming step low amounts of a nucleating agent consisting of solid particles of crystalline zeolites treated with high-boiling acrylcarboxylic acid or sulphonic acid.

Process for the crystallization of high polymers in the presence of

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Milan, Italy

Valentino Zamboni