FIELD: chemistry.
SUBSTANCE: invention relates to a process for purifying phosphoric acid obtained by treatment of the natural phosphate with a strong acid, comprising the step of filtering a phosphoric acid through a membrane of nanofiltration, wherein the nanofiltration membrane is an organic membrane nanofiltration, stable in an acidic environment, which is adsorbed at least one a water-soluble polymer comprising at least one amine functional group, one functional aromatic amino acid per functional group and/or one spirit functional group.
EFFECT: method of purifying phosphoric acid solution, in which the organic life of nanofiltration membranes are usually more than about one year, while maintaining continuous operation during of this period of high performance in terms of permeability and resource.
8 cl, 1 dwg, 2 tbl, 2 ex
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