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1. WO2020110153 - SYSTÈME D'EXTRACTION CONTINUE D'EAU PURE À PARTIR DE CHARGE D'ALIMENTATION AVEC UNE RESATURATION ET UNE RÉUTILISATION DE L'EXTRACTION

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CLAIMS

We claim;

1) A Forward Osmosis (FO)-based system for continuous extraction of pure water directly into industrial starting materials through their use in the form of draw solutions with recycle and reuse of minor portion of the outlet draw in subsequent cycles and making available the rest for industrial processes, said system comprising of:

- FO module (1) consisting of semi-permeable membrane,

- inlet (3) and outlet (9) flow conduits connected to the FO module for contacting feed solution (FS),

- inlet (6) and outlet (10) flow conduits connected to FO module for contacting draw solution (DS),

- metering pumps for circulating the solutions,

-a dissolver module (15) for contacting a diluted draw solution with a solute,

-a clarification module (17) for removing the undissolved solute from saturated draw solution,

-in-line dissolved solute concentration detector (16),

-two conduit split gate valves (12, 5) for splitting the volume of outlet draw solution one (12) for splitting before re-saturation and the other (5) for splitting after re-saturation with solute;

Characterized in that, the system allows continuous extraction of water from feed solution by recycling a minor part of diluted Draw solution through the FO module in subsequent cycles after re-saturation to maintain a constant flow rate while diverting the major portion of diluted draw solution for further downstream processing.

2) The system as claimed in claim 1, wherein metering pumps are selected from centrifugal pump, diaphragm pump, gear pump, peristaltic pump, lobe pump, piston pump, meter pump, pneumatically driven pump.

3) The system as claimed in claim 1, wherein dissolver module is selected from PVC, FRP, HDPE, HDPE-lined-MS, MS, SS Stirred tank Dissolver/Mixer fitted with propeller, continuously fed solute bed with up flow or down flow of outlet draw;

4) The system as claimed in claim 1, wherein clarification module is operated on the principle of coagulation, flocculation, sedimentation, flotation, mesh screening, cloth filtration, microfiltration, centrifugation;

5) The system as claimed in claim 1, wherein solute concentrator detector is selected from total dissolved solids meter, water activity detector, refractive index detector, density meter, spectrometer, and chromatography unit.

6) The system as claimed in claim 1, wherein turbidity of clarified stream is measured with turbidity meter;

7) The system as claimed in claim 1, wherein conduit split gate valve is selected from two way flow-divider, control valve, ball valve;

8) The system as claimed in claim 4, wherein dissolver module is provided with external temperature-control jacket to control within temperature range from 10 to 50 °C.

9) A process for continuous extraction of pure water from feed with re -saturation and reuse of draw comprising steps of:

Step a) feeding a draw solution and a feed solution from the respective inlets (3 and 6) into an FO module (1) having a partitioning semi-permeable membrane between both the solutions to permeate pure water from feed

solution into draw solution through osmotic pressure difference, wherein draw solution is at higher osmotic pressure than feed solution,

Step b) collecting the diluted draw solution and concentrated feed solution from the respective outlets (10, 9),

Step c) contacting the undersaturated draw solution with additional solute of the same type, on the one hand, and, on the other hand, contacting a minor part of the undersaturated draw solution with the same solute to make it a saturated draw solution once again while contacting the major part of the undersaturated draw solution with a different solute as per intended application,

Step d) stirring and increasing the temperature to dissolve the solute rapidly and completely in dissolver (15),

Step e) clarifying the saturated solution to remove undissolved solute from the solution in clarifier (17),

Step f) Recirculating the clarified re-saturated draw solution in subsequent cycles of FO.

10) The process for continuous extraction of pure water from feed with re-saturation and reuse of draw as claimed in claim 9, wherein temperature is selected between 10 to 50 °C and feed and draw inlet gauge pressures are in the range of 0.1 -2.0 bar.