Patent ID: 7618538

Claim:
A procedure for elimination of boron from sea-water by reverse osmosis membranes which comprises: a first phase in which a composition consisting of at least one metal together with at least one antiscaling-dispersant agent is added to sea-water, further adding a sulphite compound during the first phase, a second phase in which an alkalinising agent is added until a pH of between 8 and 9.5 is achieved, a reverse osmosis step which comprises subjecting the sea-water having said pH between 8 and 9.5 and the added components to reverse osmosis in order to obtain permeate water having a reduced boron content of 0.1 to 0.3 mg/L, wherein said sulphite compound is selected from the group consisting of sodium bisulphite, sodium metabisulphite and sodium sulphite or mixtures thereof, monitoring the presence of the at least one antiscaling-dispersant agent by measuring a redox potential of the sea-water to which the sulphite compound has been added, comparing the redox potential as measured with a reference value of a redox potential corresponding to a desired level of the antiscaling-dispersant agent, and adjusting the addition of the antiscaling-dispersant agent until the redox potential as measured corresponds to the reference value of the redox potential.