Patent GB-478134-A (GB)
Title: A process for removing salts from solutions
IPC: C02F1/42
Filed: 1936-07-10
Abstract: A process for removing salts from solutions, applicable for softening water or purifying sugar solutions, consists in subjecting the solution first to the action of a hydrogen-exchange material and then to the action of an insoluble oxide or hydroxide, which forms insoluble basic compounds with the acids formed by hydrogenion exchange.  The liquid may be brought into contact with or filtered through the oxide or hydroxide, which may be in the form of granules. Oxides or hydroxides of iron, aluminium, zinc, tin, copper and lead are suitable substances.  A naturally occurring mineral, such as bauxite, pyrolusite or bog iron ore, or a synthetic product, for example a dried gel, may be used.  Metals themselves may be used if the treatment is carried out in the presence of air or oxidizing agents.  Alloys or mixtures of metals may be used.  The liquid may be decarbonated, desilicified or partially softened before treatment with the oxide or hydroxide.  The oxide or hydroxide may be regenerated by treatment with an alkaline solution.  Strong salt solutions, such as sea water, may be repeatedly subjected to successive ion-exchange and deacidifying treatment.ALSO:A process for removing salts from solutions, applicable for softening water or purifying sugar solutions, consists in subjecting the solution first to the action of a hydrogen-exchange material and then to the action of an insoluble oxide or hydroxide, which forms insoluble basic compounds with the acids formed by hydrogen-ion exchange.  The liquid may be brought into contact with or filtered through the oxide or hydroxide, which may be in the form of granules.  Oxides or hydroxides of iron, aluminium, zinc, tin, copper and lead are suitable substances.  A naturally occurring mineral, such as bauxite, pyrolusite or bog iron ore, or a synthetic product, for example a dried gel, may be used.  Metals themselves may be used if the treatment is carried out in the presence of air or suitable oxidizing agents.  Alloys p  or mixtures of metals may be used.  The liquid may be decarbonated, or desilicified before treatment with the oxide or hydroxide.  The oxide or hydroxide may be regenerated by treatment with an alkaline solution.  Strong salt solutions such as sea water may be repeatedly subjected to successive ion-exchange and deacidifying treatment.ALSO:Sugar solutions containing lime or alkali salts are subjected to hydrogen-ion exchange treatment and then deacidified by contact with, or filtering through, an insoluble oxide or hydroxide which forms insoluble basic compounds with the acids formed by hydrogenion exchange.  Oxides or hydroxides of iron, aluminium, zinc, tin, copper and lead are suitable substances.  A naturally occurring mineral, such as bauxite, pyrolusite or bogiron ore, or a synthetic product, for example; a dried gel, may be used. Metals themselves may be used if the treatment is carried out in the presence of air or suitable oxidizing agents.  Alloys or mixtures of metals may be used.  The solution may be decarbonated before treatment with the oxide or hydroxide.  The deacidifying agent may be regenerated by treatment with an alkaline solution.