US 2026/0273466 A1 · AN INTEGRATED RESOURCE RECOVERY AND CO-TREATMENT SYSTEM OF DESALINATION BRINE AND FLUE GAS VIA WASTE BRINE ELECTROLYSIS AND SUSTAINABLE CO2 MINERALISATION (FROM BRINE TO NEWSEAWATER)

Abstract

Disclosed herein is a process for treating a desalination-rejected brine and a flue gas, the process comprising the steps of (a) subjecting a desalination-rejected brine to reaction with an alkali metal hydroxide to provide a precipitate comprising magnesium hydroxide and an alkaline brine, and separating the precipitate from the alkaline brine, (b) bubbling a flue gas comprising CO2 into the alkaline brine to provide a precipitate comprising calcium carbonate and a softened brine, and separating the precipitate from the softened brine, (c) subjecting the softened brine to acidification by addition of an acid to provide an acidified brine having a pH of from 1 to 5, (d) providing the acidified brine to an anode compartment of a flow electrochemical cell and providing a seawater and/or a reclaimed seawater to a cathode compartment of the flow electrochemical cell and generating chlorine gas, an anode brine, hydrogen gas and an alkaline cathode brine, and (e) mixing the anode brine and the entirety or a third portion of the alkaline cathode brine together and subjecting the mixture to a dechlorination reaction to provide a reclaimed seawater. Also disclosed herein is an apparatus for treating a desalination-rejected brine and a flue gas.

Claims14

Dependent claims

A process for treating a desalination-rejected brine and a flue gas, the process comprising the steps of:

(a) subjecting a desalination-rejected brine to reaction with an alkali metal hydroxide to provide a precipitate comprising magnesium hydroxide and an alkaline brine, and separating the precipitate from the alkaline brine;
(b) bubbling a flue gas comprising CO2 into the alkaline brine to provide a precipitate comprising calcium carbonate and a softened brine, and separating the precipitate from the softened brine;
(c) subjecting the softened brine to acidification by addition of an acid to provide an acidified brine having a pH of from 1 to 5;
(d) providing the acidified brine to an anode compartment of a flow electrochemical cell and providing a seawater and/or a reclaimed seawater to a cathode compartment of the flow electrochemical cell and generating:
chlorine gas and an anode brine from an electrochemical chlorine evolution reaction;
and
hydrogen gas and an alkaline cathode brine from an electrochemical hydrogen evolution reaction;
and
(e) mixing the anode brine and the entirety or a third portion of the alkaline cathode brine together and subjecting the mixture to a dechlorination reaction to provide a reclaimed seawater.

6 more elements

An apparatus for treating a desalination-rejected brine and a flue gas, the apparatus comprising:

a first reactor configured to receive a desalination brine and an alkali metal hydroxide to provide a first precipitate and an alkaline brine, and a first separation means or apparatus to separate the first precipitate from the alkaline brine;
a second reactor configured to receive the separated alkaline brine and a flue gas, where the second reactor is configured to allow the flue gas to be bubbled through the alkaline brine to provide a second precipitate and a softened brine, and a second separation means or apparatus to separate the second precipitate from the softened brine;
a third reactor configured to receive the softened brine and an acid in amounts to provide an acidified brine;
a flow electrochemical cell comprising:
an anode compartment for receiving the acidified brine;
a cathode compartment for receiving a seawater and/or a reclaimed seawater;
and
an ion-selective membrane between the anode and cathode compartments, wherein the flow electrochemical cell is configured to provide:
chlorine gas and an anode brine from the acidified brine;
and
hydrogen gas and an alkaline cathode brine from the seawater and/or the reclaimed seawater;
and
a dechlorination reactor to receive the anode brine and at least a portion of the alkaline cathode brine and provide a reclaimed seawater.

10 more elements

Dependencies are inferred from the claim text.

An integrated resource recovery and co-treatment system of desalination brine and flue gas via waste brine electrolysis and sustainable co2 mineralisation (from brine to newseawater)

Life of this patent

An integrated resource recovery and co-treatment system of desalination brine and flue gas via waste brine electrolysis and sustainable co2 mineralisation (from brine to newseawater)

Life of this patent

Abstract

Claims14