Process for preparation of synthetic faujasite molded body
US4925613A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1986 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Dec 12, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B39/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A synthetic faujasite molded body having high purity and high crystallinity is prepared with a good reproducibility by a process wherein a structure-inducing substance is incorporated in a starting material mixture comprising as main components a silica source, an alumina source, an alkali source and water; the mixture is kneaded and molded into a desired shape; and the molded body is heated in an aqueous solution of an alkali metal silicate or hydroxide. The structure-inducing material has a composition defined by the following oxide molar ratios: PA1 SiO.sub.2 /Al.sub.2 O.sub.2 =14 to 60, PA1 M.sub.2 O/Al.sub.2 O.sub.3 =15 to 40 and PA1 H.sub.2 O/M.sub.2 O=12 to 40 (M=alkali metal), and is prepared by mixing together an aqueous alkali metal silicate solution, an aqueous alkali metal aluminate solution and an aqueous alkali metal hydroxide solution to prepare a liquid phase substance having a composition defined by the following oxide molar ratios: PA1 SiO.sub.2 /Al.sub.2 O.sub.3 =8 to 14, PA1 M.sub.2 O/Al.sub.2 O.sub.3 =7 to 30, and PA1 H.sub.2 O/M.sub.2 O=10 to 14, aging the liquid phase substance at 20.degree. to 60.degree. C. for 10 minutes to 6 hours; and incorporating an aqu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.