Manufacture of zeolite naa

Abstract

Abstract PURPOSE: To obtain zeolite NaA which has the same grain size distribution as that of a seed crystal and does not contain grit by using the powdery zeolite NaA which is regulated in the molar ratios of Na 2 O, Al 2 O 3 , and SiO 2 .yH 2 O, contains a half amt. of the particles below the specific grain size and has prescribed grain size spectra as the seed crystal. CONSTITUTION: The powdery zeolite NaA is produced by a publicly known method in accordance with West German Patent No. 2660723 Specification. The addition of the seed crystal described above is executed before the end of the addition of aluminate in particular. After the end of the heating period of the resulted zeolite NaA, the product has desired properties, such as Ca bindability, non-grit containing property and grain size distribution. The compsn. of the seed crystal has Na 2 O1.0±0.2:Al 2 O 3 :SiO 2 .yH 2 O1.85±0.5 (y denotes a value up to 6), contains 50 wt.% particles below 40 μm and the grain size distribution shown in Table. COPYRIGHT: (C)1990,JPO

Inventors

• 👤 Jurgen Dorr
• 👤 ユルゲン・デル

Bibliographic Details