YU48473B - Silicates based softener of alkali metals for detergent, production procedures for cogranulates and cogranulat produced by such procedure - Google Patents

Abstract

An alkali metal silicate softener for detergent, which is a detergent ingredient, comprising an alkali metal silicate of a SiO2 / M2O molar ratio of 1.6 to 3.5, preferably between 1.8 and 2.6, of sodium or potassium, with at least 30% atoms of silicon in the form of Q2 and Q3, which represents the degree of association of the silicon atoms with each other, such that Q2 means that each silicon atom participates in two -Si-O-Si- bonds, while the other two bonds are terminated -Si-OX, where X is an alkali metal or hydrogen, and Q3 means that each silicon atom participates in three -Si-O-Si- bonds, while the remaining bond is the termination -Si-OX, where X is an alkali metal or hydrogen. An alkali metal silicate softener for detergent, which is a detergent ingredient according to claim 1, consisting of an alkali metal silicate, sodium or potassium, with at least 50% of silicon atoms in the form of Q2 and in the form of Q3. A process for producing a round cogranulate hydrated alkali metal silicate, by atomising an aqueous solution based on alkali metal silicates or a mixture of alkali metal silicates and carbonates by a rolling layer of alkali metal carbonate particles, and the amount of silicate or carbonate solution silicate, carbonate which is dispersed, as well as the amounts of carbonate-based particles, correspond to a ratio of fluid flow to particle flow, which is between 0.2 and 0.8 lit / kg, so that the co-granulates thus obtained thicken at the temperature at which both the co-granulates are rolled and the co-granulates thus dried by fluidizing to a content of bound water in silicate, corresponding to a weight ratio of silicate expressed as dry matter to bound water in silicate of the order 100/120 to 100/40, and thus the dried cogranulate has a carbonate content of between 47% and 87% by weight, preferably between 64 % to 69% by weight, has a silicate content of between 8% and 38% by weight, preferably between 24% and 31% by weight and has a water content of between 5% and 25% by weight, preferably between 12% and 20% by weight. The cogranulate obtained by the method of claims 8 and 9, characterized in that the particles constituting the rolling layer comprise less than 10% by weight of the co-granulate particles of structure other than alkali metal carbonate and have a diameter and density corresponding to the alkali metal carbonate particles. A round cogranulate based on alkali metal silicates, which is also based on alkali metal carbonates and having a silicate content, a SiO2 / MO2 molar ratio of between 1.6 and 3.5, between 8% and 38% by weight, a carbonate content of between 47% and 87% ma