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1. WO2011095977 - METHODS FOR THE SEPARATION OF HCL FROM A CHLORIDE SALT AND COMPOSITIONS PRODUCED THEREBY

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[ EN ]

WHAT IS CLAIMED IS:

1. An organic phase composition comprising

(a) a first solvent (S1) characterized by water solubility of less than 10% and by at least one of (a1) having a polarity related component of Hoy's cohesion parameter (delta-P) between 5 and 10 MPa1/2 and (b1 ) having a Hydrogen bonding related component of Hoy's cohesion parameter (delta-H) between 5 and 20 MPa1/2;

(b) a second solvent (S2) characterized by water solubility of at least 30% and by at least one of (a2) having a delta-P greater than 8 MPa /2 and (b2) having a delta-H greater than 12 MPa /2;

(c) water

(d) HCI, and

(e) a chloride salt.

2. The composition according to Claim 1 , wherein S1 is selected from the group consisting of C1 -C4 mono- and or poly-alcohols, aldehydes and ketones.

3. The composition according to Claim 1 , wherein S2 is selected from the group consisting of alcohols, ketones and aldehydes having at least 5 carbon atoms.

4. The composition according to Claim 1 , wherein S2 is selected from the group consisting of chlorides of calcium and of heavy metals.

5. The composition according to Claim 1 , wherein the S1/S2 weight/weight ratio is in the range between 10 and 0.5.

6. The composition according to Claim 1 , wherein the HCI/water weight/weight ratio is greater than 0.15.

7. The composition according to Claim 1 , wherein the HCI/salt weight/weight ratio is greater than 10.

8. The composition according to Claim 1 , wherein the chloride salt concentration is in a range between 0.01 %wt and 5%wt.

9. The composition according to Claim 1 , wherein S1 forms a heterogeneous azeotrope with water, wherein S2 forms a homogeneous azeotrope with water, or both.

10. An organic phase composition consisting essentially of:

(a) a first solvent (S1) characterized by water solubility of less than 10% and by at least one of (a1) having a polarity related component of Hoy's cohesion parameter (delta-P) between 5 and 10 MPa1/2 and (b1) having a Hydrogen

bonding related component of Hoy's cohesion parameter (delta-H) between 5 and 20 MPa1/2;

(b) a second solvent (S2) characterized by water solubility of at least 30% and by at least one of (a2) having a delta-P greater than 8 MPa1/2 and (b2) having a delta-H greater than 12 MPa1/2;

(c) water

(d) HCI, and

(e) a chloride salt.

11. A method for the separation of HCI from a chloride salt comprising

(i) providing an aqueous feed solution comprising HCI and a chloride salt;

(ii) bringing said aqueous feed solution into contact with a first extractant comprising a first solvent S1 characterized by water solubility of less than 10% and by at least one of (a1) having a delta-P between 5 and 10 MPa1/2 and (b1 ) having a delta-H between 5 and 20 MPa1/2, whereupon HCI selectively transfers to said first extractant to form an HCI-carrying first extract and an HCI-depleted aqueous feed;

(iii) bringing said HCI-depleted aqueous feed solution into contact with a second extractant comprising S1 and a second solvent S2 characterized by water solubility of at least 30% and by at least one of (a2) having a delta-P greater than 8 MPa1/2 and (b2) having a delta-H greater than 12 MPa1/2, whereupon HCI selectively transfers to said second extractant to form an organic composition according to claim 1 and claim 10 and a further HCI- depleted aqueous feed; and

(iv) recovering HCI from said first extract.

12. The method according to Claim 11 , wherein said aqueous feed is a product of leaching a mineral with HCI.

13. The method according to Claim 11 , wherein said mineral is rich in titanium.

14. The method according to Claim 11 , wherein said bringing in contact of step (ii), said bringing in contact of step (iii) or both comprises multiple stage counter- current contacting.

15. The method according to Claim 11 , wherein S1 is selected from the group consisting of C1 -C4 mono- and or poly-alcohols, aldehydes and ketones.

16. The method according to Claim 11 , wherein S2 is selected from the group consisting of alcohols, ketones and aldehydes having at least 5 carbon atoms

17. The method according to Claim 11 , wherein said delta-P of said second extractant is greater than said delta-P of said first extractant by at least 0.2

MPa1/2;

18. The method according to Claim 11 , wherein said delta-H of said second extractant is greater than said delta-H of said second extractant by at least 0.2 MPa1/2.

19. The method according to Claim 11 , wherein said first extractant comprises S2 and wherein the S2/S1 weight/weight ratio in said second extractant is greater than the S2/S1 weight/weight ratio in said first extractant by at least 10%.

20. The method according to Claim 19, wherein the first extractant is generated from the organic composition formed in step (iii) by removing S2 therefrom.

21. The method according to Claim 11 further comprising a step of removing S2 from the organic composition formed in step (iii), whereupon said first extract is formed.

22. The method according to Claim 21 , whereupon on said removing of S2 a heavy aqueous phase is formed and said heavy phase is separated from said formed first extract.

23. The method according to Claim 22, wherein the HCI/water weight/weight ratio in said heavy phase is smaller than that ratio in the HCI-depleted aqueous feed.

24. The method according to Claim 22, wherein the HCI/salt weight/weight ratio in said heavy phase is smaller than that ratio in the HCI-depleted aqueous feed

25. The method according to Claim 11 , wherein the HCI/water weight/weight ratio in said first extract is greater than that ratio in the organic composition of step (iii) by at least 10%.

26. The method according to Claim 11 , wherein the HCI/water weight/weight ratio in said first extract is greater than that ratio in the aqueous feed by at least 10%.

27. The method according to Claim 11 , wherein the HCI/salt weight/weight ratio in said first extract is greater than that ratio in the organic composition of step (iii) by at least 10%.

28. The method according to Claim 11 , wherein said recovering comprises at least one of HCI distillation and back-extraction with water or with an aqueous solution.

29. The method according to Claim 11 , wherein the HCI/salt ratio in said further depleted aqueous feed is smaller than 0.05.

30. The method according to Claim 11 , wherein said provided aqueous feed comprises an impurity, wherein the impurity/salt ratio in said feed is R1 , wherein the impurity/salt ratio in said further depleted aqueous feed is R2 and wherein R1/R2 is greater than 1.5.

31. The method according to Claim 30, wherein said impurity is another acid.

32. The method according to Claim 30, wherein said impurity is another salt.