US 11,912,591 B2
Electrodialysis processes using an organic solvent for separating dissolved species
Brian M. Mcdonald, Austin, TX (US); and Ethan L. Demeter, The Woodlands, TX (US)
Filed by MIS IP Holdings, LLC, Houston, TX (US)
Filed on Mar. 2, 2021, as Appl. No. 17/189,853.
Claims priority of provisional application 62/984,681, filed on Mar. 3, 2020.
Prior Publication US 2021/0276892 A1, Sep. 9, 2021
Int. Cl. C02F 1/469 (2023.01); B01D 61/46 (2006.01); B01D 61/52 (2006.01); C02F 101/10 (2006.01); C02F 101/12 (2006.01); C02F 103/10 (2006.01)
CPC C02F 1/4691 (2013.01) [B01D 61/46 (2013.01); B01D 61/52 (2013.01); B01D 2311/25 (2013.01); B01D 2311/2642 (2013.01); B01D 2311/2669 (2013.01); B01D 2311/2673 (2013.01); C02F 2101/101 (2013.01); C02F 2101/108 (2013.01); C02F 2101/12 (2013.01); C02F 2103/10 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A water treatment system for separating dissolved salts from a feed stream comprising:
an inlet feed stream comprising dissolved salts;
an inlet brine stream comprising at least 60 wt. % ethanol and/or isopropanol;
an electrodialysis unit configured to remove the dissolved salts from the inlet feed stream and add the dissolved salt to the inlet brine stream to form an outlet brine stream;
a precipitation tank configured to precipitate the dissolved salts out of the outlet brine stream from the electrodialysis unit, wherein the precipitation tank comprises a flash valve configured to flash off a fraction of the solution of outlet brine stream as vapor;
a supernatant brine stream from the precipitation tank comprising at least 60 wt. % ethanol and/or isopropanol, wherein the supernatant brine stream is sent to the electrodialysis unit to be at least a portion of the inlet brine stream;
a distillation column configured to receive the vapor from the precipitation tank and generate a vapor stream comprising a higher concentration of ethanol and/or isopropanol than the vapor from the precipitation tank; and
a condenser configured to condense the vapor stream from the distillation column, wherein the condensed vapor stream is sent to the electrodialysis unit to be at least a portion of the inlet brine stream.