Magnesium-silicate bound zeolite granulates of the type of zeolite A, process for their production and use

US4668648A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Hans Strack · Alzenau, DE
• Peter Kleinschmit · Hanau, DE

Key dates

• Filing date: Feb 10, 1986
• Grant date: May 26, 1987
• Expiry date: Feb 10, 2006

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A24D3/166
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Magnesium-silicate bound zeolite granulates of type A are disclosed wherein the zeolite component does not contain magnesium exclusively, or contains no magnesium at all, as the cation. The granulates are produced by placing powdered zeolite A in a mixer, adding sodium silicate solution, mixing until zeolite granulates with a grain size of at least 0.1 mm are obtained, optionally after-rolling these zeolite granulates, optionally initially drying the moist zeolite granulates at temperatures of 20 to 39 degrees C., during which the carbon dioxide content of the drying air is adjusted to less than 200 ppm, then optionally drying in a second drying step at temperatures of 40-120 degrees C. and optionally in a third drying stage at 121-200 degrees C. under otherwise identical conditions, and then optionally activating the granulates thus obtained at temperatures of 600 degrees C. maximum. The granulates thus obtained are treated with an aqueous magnesium salt solution, washed, then optionally treated with aqueous metal salt solution, washed, dried at 40-200 degrees C., preferably 100 to 120 degrees C., and then optionally calcined at 300 to 650 degrees C.