Patent GB-394314-A (GB)
Title: Improvements in or relating to the treatment of liquid milk products and other phosphate containing aqueous solutions
IPC: A23C9/146
Filed: 1931-12-04
Abstract: Phosphate ions are removed from aqueous solutions by treatment with base exchange silicates in the presence of ions of alkaline earth metals, magnesium, iron, aluminium, or chromium.  The solutions to be treated may be maintained slightly acid.  The amount of phosphate and calcium ions removed can be increased or reduced by increasing or reducing the amount of silicate and acid employed.  The silicates used include zeolites, glauconite and artificial zeolitic materials such as "Permutite" and "Refinite."  The spent silicate may be regenerated by washing with soft water, treating with an aqueous solution of caustic soda or other caustic alkali, washing again with soft water and then contacting with a solution of sodium chloride or other revivifying alkali metal salt.ALSO:Phosphate ions are removed from aqueous solutions by treatment with base exchange silicates in the presence of ions of alkaline-earth metals, magnesium, iron, aluminium, or chromium. The phosphate and calcium ions in milk products such as whole or skim milk or whey are reduced by treating with the base exchange silicates, the milk products being preferably maintained slightly acid, e.g. by addition of a small amount of hydrochloric, lactic or pure sulphuric acid, to compensate for the neutralizing effect of the silicates.  The treated milk product may be employed for evaporation, cheese-making, the preparation of infants' food and lactose, &c.  The amount of phosphate and calcium ions removed can be increased or reduced by increasing or reducing the amount of silicate and acid employed.  The silicates used include zeolites, glauconite and artificial zeolitic materials such as "Permutite" and "Refinite."  The spent silicate may be revived by washing with soft water, treating with an aqueous solution of caustic soda or other caustic alkali, washing again with soft water and then contacting with a solution of sodium chloride or other revivifying alkali metal salt.ALSO:Phosphate ions are removed from aqueous solutions by treatment with base exchange silicates in the presence of ions of alkaline earth metals, magnesium, iron, aluminium or chromium.  The phosphate and calcium ions in milk products such as whole or skim milk or whey are reduced by treating with the base exchange silicates, the milk products being preferably maintained slightly acid, e.g. by addition of a small amount of hydrochloric, lactic or pure sulphuric acid, to compensate for the neutralizing effect of the silicates.  The treated milk product may be employed for cheese making.  The amount of phosphate and calcium ions removed can be increased or reduced by increasing or reducing the amount of silicate and acid employed.  The silicates used include zeolites, glauconite and artificial zeolitic materials such as "Permutite" and "Refinite."  The spent silicate may be revived by washing with soft water, treating with an aqueous solution of caustic soda or other caustic alkali, washing again with soft water and then contacting with a solution of sodium chloride or other revivifying alkali metal salt.