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OwnerPeter Braun, Ulrike Fischer-Nageleinventors
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The invention relates to a novel phosphate mixture, which is characterised by the excellent solubility thereof in water and in aqueous solutions containing salt (brine). The novel phosphate mixture is characterised in that it is made of the following components: 1) 60-85 wt. % of a clear-soluble potassium tripolyphosphate having a P2O5 content of 46.0 wt. %-47.0 wt. %, preferably 46.4 46.8 wt. %, especially 46.4 wt % and a K2O/P2O5 Mol ratio of 1.70 1.78, preferably 1.73 1.75 and especially 1.74, 2) 15-39 wt. % of sodium polyphosphate NPP, 3.) 1-5 wt. % XH2PO4, whereby X═Na and is K, whereby the mixture has a pH-value of between 8-10, preferably 8.5 9.5 and has an opacity in water and brine of <5 TE/F.
The use of a phosphate mixture composed of:
The method for producing phosphate-containing brines, composed of 60 to 85 weight % of a clear soluble potassiumpolyphosphate with a P2O5 content of 46.0 weight % to 47.0 weight %, preferably 46.4-46.8 weight %, in particular 46.4 weight % and a K2O/P2O5 mole ratio of 1.74 to 1.78, preferably 1.73 to 1.75 and in particular 1.74, further composed of 15 to 39 weight % sodiumpolyphosphate and 1 to 5 weight % XH2PO4 and/or X2H4P2O7, with X═Na and/or K, characterized in that potassiumphosphate salts or potassiumoxide and P2O5 are mixed at the desired potassium:phosphorus ratio, that the mixture is heated to the melting temperature and is kept at this temperature until a balanced reaction forms, that the mixture is then drained, finely ground and mixed at the specified ratio with correspondingly ground powders of sodium polyphosphate, XH2PO4 and/or X2H4P2O7, with X═Na and/or K.
Dependencies are inferred from the claim text.