Ionic liquids

Patent metadata

Field	Value
Publication number	US-9284264-B2
Application number	US-201013511179-A
Country	US
Kind code	B2
Filing date	Nov 25, 2010
Priority date	Nov 25, 2009
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

There is provided a mixture having a freezing point of up to 100° C. formed by a process comprising the step of contacting: (A) from 1 to 2 equivalents of a compound of formula (I) AlX 3 (I) wherein each X independently represents Cl, Br or F; with (B) 1 equivalent of a compound of formula (II) R 1 —C(O)—N(R 2 )(R 3 ) (II) wherein R 1 to R 3 have meanings given in the description. There is also provided further mixtures containing additional components, as well as methods of using the mixtures in various applications, such as for the electroreduction of the mixtures to produce aluminum metal.

First claim

The invention claimed is:

1. A mixture having a freezing point of up to 100° C. formed by a process comprising the step of contacting:
(A) from 1 to 2 equivalents of a compound of formula (I)
AlX 3   (I)

wherein each X independently represents Cl, Br or F; with

(B) 1 equivalent of a compound of formula (II)
R 1 —C(O)—N(R 2 )(R 3 )  (II)

wherein:
R 1 represents
C 1-4 alkyl optionally substituted by one or more F atoms,
—N(H)R 4 ;

R 4 represents H or C 1-4 alkyl optionally substituted by one or more F atoms; and
R 2 and R 3 independently represent
H,
C 1-6 alkyl optionally substituted by one or more F atoms or aryl.

2. The mixture of claim 1 , wherein the compound of formula (I) is AlCl 3 .

3. The mixture of claim 1 , wherein:
R 1 represents methyl, —NH 2 or —N(H)CH 3 ;
R 2 represents H or methyl; and
R 3 represents H.

4. The mixture of claim 3 , wherein the compound of formula (II) is acetamide or urea.

5. The mixture of claim 1 , wherein the process is conducted in the substantial absence of organic compounds other than the compound of formula (II).

6. The mixture of claim 1 , wherein the mixture has a freezing point of up to 80° C.

7. A mixture formed by a process comprising:
contacting from 1 to 2 equivalents of a compound of formula (I)
AlX 3   (I)

with 1 equivalent of a compound of formula (II)
R 1 —C(O)—N(R 2 )(R 3 )  (II)

to form a mixture;
wherein:
each X independently represents Cl, Br or F;
R 1 is C 1-4 alkyl optionally substituted by one or more F atoms, or —N(H)R 4 ;
R 4 is H or C 1-4 alkyl optionally substituted by one or more F atoms; and
R 2 and R 3 independently represent H, C 1-6 alkyl optionally substituted by one or more F atoms, or aryl; and

contacting the mixture with an additive.

8. The mixture of claim 7 , wherein the additive is a diluent, an electrolyte, or a brightener.

9. A composition comprising the mixture of claim 1 , wherein the mixture is a solvent, an electrolyte, a reagent, or a catalyst.

10. A method of carrying out an electrolytic reaction, which method comprises employing as a solvent and/or as an electrolyte for the electrolytic reaction mixture of claim 1 .

11. A method of electrodepositing aluminum metal onto a conductive substrate, said method comprising:
contacting the substrate and a counter electrode with the mixture of claim 1 ; and
electrolysing the mixture by applying a reducing potential to the substrate, relative to the counter electrode.

12. A method of electrodepositing onto a conductive substrate an alloy of aluminum with a metal other than aluminum, said method comprising the steps of:
(a) contacting the substrate and a counter electrode with the mixture of claim 7 , wherein the additive comprises, in a positive oxidation state, the metal other than aluminum; and
(b) electrolysing the mixture by applying a reducing potential to the substrate, relative to the counter electrode.

Assignees

• Abbott Andrew Peter
• Abood Hadi Mohammad Ali
• Univ Leicester

Inventors

• Abbott Andrew Peter
• Abood Hadi Mohammad Ali

Classifications

• C25D3/665

  from ionic liquids · CPC title

• C25D3/44

  Aluminium · CPC title

• C07C275/02

  Salts; Complexes; Addition compounds · CPC title

• C07C233/05 Primary

  having the nitrogen atoms of the carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms · CPC title

• C07C275/06

  of an acyclic and saturated carbon skeleton · CPC title