Andrew Paul Chapple

Zeolite map: The new detergent zeolite

This paper describes the physical and chemical properties of a new zeolite, MAP, which have led to its commercialisation for use as a detergent builder. Its advantageous calcium exchange selectivity and water sorption properties are the result of unusual flexibility of the Zeolite P framework; these are delivered through engineering the framework composition and the size and porosity of the finished particles.

Zeolite map: A new detergent builder

Summary A new detergent zeolite, zeolite MAP, has been developed by the Crosfield Group (a Unilever Company) under the tradename Doucil A24. We report here the technical properties which make the new material superior to zeolite 4A in modern detergent products. These properties — of calcium exchange selectivity and kinetics, water adsorption/mobility and controllable particle size/porosity — lead to superior building, bleach stability and liquid surfactant carrying in fabric washing powders. MAPs characteristics derive from the novel particle engineering which has produced the framework structure, primary crystallites of selected size and tailored particle size. This new zeolite is the cornerstone of Levers new range of detergent powders.