Back to results
US 6,019,956 AGranted
Zeolites and processes for their manufacture
AssigneeExxon Chemical Patents Inc.
InventorJohannes Petrus Verduijn
Life of this patent
Estimating the term…
Abstract
Colloidal Offretite, a process for its manufacture, and zeolite manufacture using it.
Claims15
A process for the manufacture of a colloidal suspension of Offretite, wherein a synthesis mixture having a molar composition, when calculated in terms of oxides, in the following ranges:
- ______________________________________ K.sub.2 O:Al.sub.2 O.sub.3 0.25 to 0.5:1 (TMA).sub.2 O:Al.sub.2 O.sub.3 at least 2.0:1 SiO.sub.2 :Al.sub.2 O.sub.3 8 to 10:1 H.sub.2 O:Al.sub.2 O.sub.3 80 to 100:1 ______________________________________
- wherein TMA represents the tetramethylammonium cation, is subjected to thermal treatment at a temperature and for a time sufficient to form a colloidal suspension of Offretite having a maximum dimension of at most 100 nm.
A process for the manufacture of Offretite which comprises forming a synthesis mixture, substantially free from free organic structure directing agent, and having a molar composition, calculated in terms of oxides, in the following ranges:
- ______________________________________ M.sub.2 O:Al.sub.2 O.sub.3 1.9 to 2.1:1 SiO.sub.2 :Al.sub.2 O.sub.3 9 to 11:1 H.sub.2 O:Al.sub.2 O.sub.3 140 to 180:1 ______________________________________
- wherein M represents potassium, of which up to 30 molar percent may be replaced by sodium, and also containing seed crystals of Offretite of maximum dimension at most about 100 nm, and subjecting the seed-containing synthesis mixture to hydrothermal treatment for a time and at a temperature sufficient to form Offretite.
Dependencies are inferred from the claim text.