| 主权项 |
1. A unit for pretreating water by direct contact between a first fluid and a second fluid, the unit comprising a heat and ion exchanger configured to carry out transfer between the first fluid and the second fluid, the heat and ion exchanger being composed of two portions:
a cooling portion for cooling water to be treated; and a heating portion for heating water to be treated, wherein the first fluid includes a saline water phase, the second fluid includes a continuous fluorinated phase comprising:
a fluorinated liquid that is not miscible with water, with a density of more than 1.25, the fluorinated liquid having a formula CnHmFpNqOxSy,
where C, H, F, N, O, S respectively represent a carbon, hydrogen, fluorine, nitrogen, oxygen and sulfur atom, n is an integer in the range 3 to 25, limits included, m is an integer in the range 0 to 27, limits included, p is an integer in the range 5 to 54, limits included, q is an integer in the range 0 to 6, limits included, x is an integer in the range 0 to 10, limits included, and y is an integer in the range 0 to 6, limits included, anda non-ionic fluorinated ion exchange liquid which is different from the fluorinated liquid and is dissolved in the fluorinated liquid, the non-ionic fluorinated ion exchange liquid selected from the group consisting of 2,2H-3-oxyperfluorohexanal, 2,2H-3-oxyperfluorooctanal, 2,2H-3-thioperfluorohexanal, perfluorohexylamine, perfluoroheptylamine, perfluorohexyloxyamine, perfluorobutylthioetheramine, perfluoropentylthioetheramine, perfluorobutyletherethylene alcohol, and perfluoropentyletherethylene alcohol, and the fluorinated continuous phase that is cooled in the heating portion is re-used as the fluorinated continuous phase that is heated up in the cooling portion. |
