Method and device for desalting water

B - Operations – Transporting – 01 – D

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B01D 61/06 (2006.01) F04B 9/117 (2006.01) C02F 1/44 (2006.01)

Patent

CA 2379721

The invention concerns a method for desalting water by reverse osmosis, in particular for desalting sea water, whereby salt water at a first pressure level is introduced into a pressure compensating device, and is conveyed from the pressure-compensating device at a second, higher pressure level into a membrane module, whereby desalted water and concentrated salt water are discharged from the membrane module. In order to increase the efficiency and consequently the energy balance of such a method, the invention proposes to continuously introduce the concentrated salt water, which has been discharged from the membrane module, at a second pressure level into the pressure- compensating device, wherein it is used to subject the salt water introduced into the pressure compensating device to the second pressure level, and to discharge the salt water and convey it to the membrane module. The invention also concerns a device for implementing this method.

L'invention concerne un procédé pour dessaler de l'eau par osmose inverse, notamment pour dessaler de l'eau de mer. Ce procédé consiste à introduire de l'eau salée à une première pression dans un dispositif de compensation de pression, avant de la faire pénétrer à une deuxième pression, supérieure à la première, dans un module à membrane, puis à évacuer de ce dernier l'eau dessalée et l'eau salée concentrée. L'invention vise à accroître le rendement et par conséquent le bilan énergétique de ce procédé. A cet effet, l'eau salée concentrée évacuée du module à membrane est introduite en continu, à la deuxième pression, dans le dispositif de compensation de pression, où elle est utilisée pour exposer l'eau salée introduite dans le dispositif de compensation de pression, à la deuxième pression, et pour évacuer l'eau salée et l'acheminer au module à membrane. L'invention concerne également un dispositif pour mettre en oeuvre ledit procédé.

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