DIRECT SOLVENT CONTACT CRYSTALLIZATION ZERO-LIQUID DISCHARGE DESALINATION WITH VOLATILE HYDROPHOBIC RECOVERY AGENT REGENERATION
Provided are direct solvent contact crystallization devices and methods. A direct solvent contact crystallization device can comprises a first liquid-liquid separator comprising an inlet stream comprising 10-35 wt. % salt and a first outlet stream comprising water and a solvent; a second liquid-liquid separator comprising an inlet stream comprising the first outlet stream of the first liquid-liquid separator and a first outlet stream comprising 95 wt. % or greater water; and a separation unit comprising an inlet stream comprising a second outlet stream of the second liquid-liquid separator, a first outlet stream comprising the solvent, and a second outlet stream comprising a recovery agent, wherein the inlet stream of the first liquid-liquid separator comprises the first outlet stream of the separation unit, and the inlet stream of the second liquid-liquid separator comprises the second outlet stream of the separation unit.
1 . A direct solvent contact crystallization device comprising:
a first liquid-liquid separator, the first liquid-liquid separator comprising an inlet stream, a first outlet stream and a second outlet stream, wherein the inlet stream comprises 10-35 wt. % salt and the first outlet stream comprises water and a solvent;
a second liquid-liquid separator, the second liquid-liquid separator comprising an inlet stream, a first outlet stream, and a second outlet stream, wherein the inlet stream comprises the first outlet stream of the first liquid-liquid separator and the first outlet stream comprises 90 wt. % or greater water; and
a separation unit, the separation unit comprising an inlet stream, a first outlet stream, and a second outlet stream, wherein the inlet stream comprises the second outlet stream of the second liquid-liquid separator, the first outlet stream comprises the solvent, and the second outlet stream comprises a recovery agent,
wherein the inlet stream of the first liquid-liquid separator comprises the first outlet stream of the separation unit, and the inlet stream of the second liquid-liquid separator comprises the second outlet stream of the separation unit.
2 . The device of claim 1 , wherein the first liquid-liquid separator is a crystallizer or brine concentrator.
3 . The device of claim 1 , wherein the salt is a salt of sodium, potassium, calcium, magnesium, bromide, chloride, or iodide.
4 . The device of claim 1 , wherein the solvent comprises primary and secondary amines
5 . The device of claim 1 , wherein the solvent comprises 10-80 wt. % primary amines, 0-80 wt. % secondary amines, 0-80 wt. % tertiary amines, and 0-30 wt. % recovery agent.
6 . The device of claim 1 , wherein the recovery agent comprises one of butane, propane, ethane, pentane, diethyl ether, or dichloromethane.
7 . The device of claim 1 , wherein the second liquid-liquid separator is configured to heat the inlet stream to a temperature of 40-90° C.
8 . The device of claim 1 , wherein the separation unit is a distillation column or a flash drum.
9 . A method of desalinating water comprising:
passing an inlet stream through a first liquid-liquid separator to produce a first outlet stream and a second outlet stream, wherein the inlet stream comprises 10-35 wt. % salt and the first outlet stream comprises water and a solvent;
routing the first outlet stream of the first liquid-liquid separator through a second liquid-liquid separator comprising an inlet stream to produce a first outlet stream and a second outlet stream, wherein the inlet stream comprises the first outlet stream of the first liquid-liquid separator and the first outlet stream comprises 90 wt. % or greater water; and
routing the second outlet stream of the second liquid-liquid separator through a separation unit comprising an inlet stream to produce a first outlet stream and a second outlet stream, wherein the inlet stream comprises the second outlet stream of the second liquid-liquid separator, the first outlet stream comprises the solvent, and the second outlet stream comprises a recovery agent,
wherein the inlet stream of the first liquid-liquid separator comprises the first outlet stream of the separation unit, and the inlet stream of the second liquid-liquid separator comprises the second outlet stream of the separation unit.
10 . The method of claim 9 , wherein the first liquid-liquid separator is a crystallizer or brine concentrator.
11 . The method of claim 9 , wherein the salt is a salt of sodium, potassium, calcium, magnesium, bromide, chloride, or iodide.
12 . The method of claim 9 , wherein the solvent comprises primary amines, secondary amines, tertiary amines, and the recovery agent.
13 . The method of claim 9 , wherein the solvent comprises 10-80 wt. % primary amines, 0-80 wt. % secondary amines, 0-80 wt. % tertiary amines, and 0-30 wt. % recovery agent.
14 . The method of claim 9 , wherein the recovery agent comprises one of butane, propane, ethane, pentane, diethyl ether, or dichloromethane.
15 . The method of claim 9 , wherein the second liquid-liquid separator is configured to heat the inlet stream to a temperature of 40-90° C.
16 . The method of claim 9 , wherein the separation unit is a distillation column or a flash drum.