Zeolite P aluminosilicates and their manufacture and use in detergent compositions
AssigneeImperial Chemical Industries PLC
InventorAbraham Araya
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Abstract
P-type zeolite having the oxide formula M2/nAl2O3 (1.8-2.66) SiO2 y H2O and having a Calcium Binding Capacity of between 100 and 145 mg/g, preferably between 110 and 140 and a Calcium uptake rate of between 12 and 100 seconds, preferably below 50 seconds can be prepared from metakaolin.
Claims12
P-type zeolite having the oxide formula:
- M2/nO.Al2O3. (1.8-2.66) SiO2.yH2O
- having a Calcium Effective Binding Capacity of between 100 and 145 mg/g and a Calcium uptake rate of between 12 and 100 seconds and wherein y is the number of moles of water per mole of Al2O3 and M is an n-valent cation.
Process for manufacturing a P-type zeolite wherein a caustic solution is first added into a reactor tank to form a caustic pool, metakaolin is then added to said caustic pool and allowed to react with the caustic solution in the presence of P-type zeolite seeds, said P-type zeolite seeds being added manufactured thereby has a Calcium uptake rate of between 12 and 100 seconds and has the oxide formula:
- M2/nO.Al2O3. (1.8-2.66) SiO2.yH2O
- wherein y is the number of moles of water per mole of Al2O3 and M is an n-valent cation.
Detergent composition comprising 0.5% to 60% by weight of a surfactant system, 20% to 80% by weight of a detergency builder system;
- the detergency builder system comprising, in an amount of 5% to 80% by weight of the detergent composition, an alkali metal aluminosilicate of the zeolite P type having a silicon to aluminum ratio not greater than 1.33, the aluminosilicate having a Calcium Effective Binding Capacity of between 100 and 145 mg CaO per g of anhydrous aluminosilicate, as measured at 25° C. and a Calcium uptake rate of between 12 and 100 seconds.
Dependencies are inferred from the claim text.