Extracted material for forward osmosis, preparation method thereof, and forward-osmosis water desalination system using the same

Patent metadata

Field	Value
Publication number	US-11273410-B2
Application number	US-201916731435-A
Country	US
Kind code	B2
Filing date	Dec 31, 2019
Priority date	Dec 31, 2019
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

An extracted material for forward osmosis is provided. The extracted material includes a first ionic compound, a second ionic compound and a third ionic compound, which are represented by formula {K[A + (R 1 )(R 2 )(R 3 )] p }(X − ) c (Y − ) d . X − is the same as Y − in the first ionic compound. X − is the same as Y − in the second ionic compound. X − in the first ionic compound is different from X − in the second ionic compound. X − differs from Y − in the third ionic compound. X − in the third ionic compound is the same as X − in the first ionic compound or X − in the second ionic compound. Y − in the third ionic compound is the same as Y − in the first ionic compound or Y − in the second ionic compound. A method for preparing an extracted material and a forward-osmosis water desalination system using the same are also provided.

First claim

What is claimed is:

1. An ionic composition for forward osmosis, comprising:
a first ionic compound;
a second ionic compound; and
a third ionic compound, wherein the first ionic compound, the second ionic compound and the third ionic compound are represented by formula (I):
{K[A + (R 1 )(R 2 )(R 3 )] p }(X − ) c (Y − ) d   (I),

wherein R 1 , R 2 and R 3 independently comprise straight or branched C1-12 alkyl, A comprises phosphorus or nitrogen, K comprises C1-15 alkyl and both ends thereof are connected to [A + (R 1 )(R 2 )(R 3 )], p=2, c and d are integers, c+d=2, and X − and Y − comprise CH 3 SO 3 − , I − , CF 3 COO − , SCN − , BF 4 − , CF 3 SO 3 − , PF 6 − , FeCl 4 − ,

wherein R 4 is —CH 2 COOH or —(CH 2 ) 4 —NH 2 , R 5 and R 6 are H or CH 3 , R 7 is —CH(CH 3 ) 2 , —(CH 2 ) 2 —CH(CH 3 ) 2 , —CH(CH 3 )—CH 2 —CH 3 or —CH 2 —C 6 H 5 , and R 8 is CH 3 or H,
wherein the group X − is the same as the group Y − in the first ionic compound, the group X − is the same as the group Y − in the second ionic compound, and the group X − in the first ionic compound is different from the group X − in the second ionic compound, and
the group X − differs from the group Y − in the third ionic compound, the group X − in the third ionic compound is the same as the group X − in the first ionic compound or the group X − in the second ionic compound, and the group Y − in the third ionic compound is the same as the group Y − in the first ionic compound or the group Y − in the second ionic compound.

2. The ionic composition for forward osmosis as claimed in claim 1 , wherein the first ionic compound and the second ionic compound comprise

3. The ionic composition for forward osmosis as claimed in claim 1 , wherein the third ionic compound comprises

4. The ionic composition for forward osmosis as claimed in claim 1 , further comprising a fourth ionic compound which is represented by formula (II):
[A + (R 1 )(R 2 )(R 3 )(R 4 )] n (X − ) a   (II),

wherein R 1 , R 2 , R 3 and R 4 independently comprise straight or branched C1-12 alkyl, A comprises phosphorus or nitrogen, n=1, a=1, and X − comprises CH 3 SO 3 − , I − , CF 3 COO − , SCN − , BF 4 − , CF 3 SO 3 − , PF 6 − , FeCl 4 − ,

wherein R 4 is —CH 2 COOH or —(CH 2 ) 4 —NH 2 , R 5 and R 6 are H or CH 3 , R 7 is —CH(CH 3 ) 2 , —(CH 2 ) 2 —CH(CH 3 ) 2 , —CH(CH 3 )—CH 2 —CH 3 or —CH 2 —C 6 H 5 , and R 8 is CH 3 or H.

5. The ionic composition for forward osmosis as claimed in claim 4 , wherein the fourth ionic compound comprises

6. The ionic composition for forward osmosis as claimed in claim 1 , further comprising a fifth ionic compound which is represented by formula (III):

wherein R 1 , R 2 , R 3 , R 4 and R 5 independently comprise straight or branched C1-12 alkyl, X − and Y − independently comprise organic or inorganic anions, e and f are zero or an integer and e+f=1.

7. The ionic composition for forward osmosis as claimed in claim 6 , wherein, in formula (III), X − and Y − comprise CH 3 SO 3 − , I − , CF 3 COO − , SCN − , BF 4 − , CF 3 SO 3 − , PF 6 − , FeCl 4 − ,

wherein R 4 is —CH 2 COOH or —(CH 2 ) 4 —NH 2 , R 5 and R 6 are H or CH 3 , R 7 is —CH(CH 3 ) 2 , —(CH 2 ) 2 —CH(CH 3 ) 2 , —CH(CH 3 )—CH 2 —CH 3 or —CH 2 —C 6 H 5 , and R 8 is CH 3 or H.

8. The ionic composition for forward osmosis as claimed in claim 1 , wherein the extracted material has a phase-transition temperature which is in a range from 20° C. to 50° C.

9. A forward-osmosis water desalination system, comprising:
a feeding unit comprising a feeding end and a draw-solution end separated from the feeding end by a semi-permeable membrane, wherein the feeding end comprises raw water, and the draw-solution end comprises the extracted material as claimed in claim 1 ;
a phase-separation unit connected to the feeding unit, the phase-separation unit comprising an aqueous layer and an ionic liquid layer, wherein the extracted material has a concentration in the ionic liquid layer which is greater than that in the aqueous layer; and
a recovery unit connected to the phase-separation unit and filtering the aqueous layer to recover pure water.

10. The forward-osmosis water desalination system as claimed in claim 9 , wherein the concentration of the extracted material is less than 10% in the aqueous layer in the phase-separation unit.

11. The forward-osmosis water desalination system as claimed in claim 9 , wherein the concentration of the extracted material is in a range from 10% to 70% in the ionic liquid layer in the phase-separation unit.

12. The forward-osmosis water desalination system as claimed in claim 9 , wherein the phase-separation unit has an operating temperature which is in a range from 20° C. to 50° C.

13. The forward-osmosis water desalination system as claimed in claim 9 , wherein the recovery unit further comprises a thin film to filter the aqueous layer introduced from the phase-separation unit.

14. A method for preparing an extracted material, comprising:
providing a first ionic compound and a second ionic compound, wherein the first ionic compound and the second ionic compound are represented by formula (I):
{K[A + (R 1 )(R 2 )(R 3 )] p }(X − ) c (Y − ) d   (I),

wherein R 1 , R 2 and R 3 independently comprise straight or branched C1-12 alkyl, A comprises phosphorus or nitrogen, K comprises C1-15 alkyl and both ends thereof are connected to [A + (R 1 )(R 2 )(R 3 )], p=2, c and d are integers, c+d=2, and X − and Y − comprise CH 3 SO 3 − , I − , CF 3 COO − , SCN − , BF 4 − , CF 3 SO 3 − , PF 6 − , FeCl 4 − ,

wherein R 4 is —CH 2 COOH or —(CH 2 ) 4 —NH 2 , R 5 and R 6 are H or CH 3 , R 7 is —CH(CH 3 ) 2 , —(CH 2 ) 2 —CH(CH 3 ) 2 , —CH(CH 3 )—CH 2 —CH 3 or —CH 2 —C 6 H 5 , and R 8 is CH 3 or H,
wherein the group X − is the same as the group Y − in the first ionic compound, the group X − is the same as the group Y − in the second ionic compound, and the group X − in the first ionic compound is different from the group X − in the second ionic compound; and
blending the first ionic compound and the second ionic compound to prepare an extraction material, wherein the first ionic compound and the second ionic compound have a molar ratio which is in a range from 0.05:0.95 to 0.95:0.05.

15. The method for preparing an extracted material as claimed in claim 14 , wherein the molar ratio of the first ionic compound to the second ionic compound is in a range from 0.15:0.85 to 0.85:0.15.

16. The method for preparing an extracted material as claimed in claim 14 , further comprising blending a fourth ionic compound which is represented by formula (II

Assignees

• Ind Tech Res Inst

Inventors

• Chen Yi-Chun
• Liu Po-I
• Ho Chia-Hua
• Chen Yeu-Ding
• Wang David Chiuni
• Horng Ren-Yang
• Chen Kai-Chi

Classifications

• B01D61/0021

  comprising multiple forward osmosis steps · CPC title

• B01D61/005 Primary

  Osmotic agents; Draw solutions · CPC title

• C02F1/445

  by forward osmosis · CPC title

• Y02A20/131

  Reverse-osmosis · CPC title

• C02F2103/08

  Seawater, e.g. for desalination · CPC title