# US 5,705,696 A · Extractive method for the preparation of quaternary salts

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- Number: US 5,705,696 A
- Document ID: US5705696A
- Status: Granted
- Kind: A
- Application number: 08/691,168
- Filed: 1996-08-01
- Granted: 1998-01-06
- Earliest claimed: 1996-08-01
- Assignees: General Electric Company
- Inventors: Joseph Anthony King, Jr.
- Web page: https://patentgrep.com/patent/US5705696A

## CPC

- C07C 209/00: Preparation of compounds containing amino groups bound to a carbon skeleton
- C07F 9/5407: {Acyclic saturated phosphonium compounds}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)

## Abstract

Quaternary (e.g., tetraalkylammonium and tetraalkylphosphonium) salts containing non-halide anions are prepared by performing an anion exchange reaction by liquid-liquid extraction with a chlorinated solvent of a mixture of an aqueous solution an alkali metal salt of the anion and a corresponding quaternary halide.

## Claims

### Claim 1

A method for preparing a quaternary ammonium or phosphonium salt having an anion of the formula ZF.sup.- -.sub.m wherein Z is an element capable of forming a perfluorinated anion and m-1 is the valence of Z, which comprises intimately contacting an aqueous solution comprising a corresponding quaternary ammonium halide and an alkali metal salt of said anion with an organic liquid which is immiscible with said aqueous solution and which is a solvent for said quaternary salt, whereupon said quaternary salt is formed and transferred to said organic liquid.

### Claim 2

A method according to claim I wherein the organic liquid is a chlorinated alkane.

### Claim 3 (depends on 2)

A method according to claim 2 wherein the chlorinated alkane is methylene chloride or chloroform.

### Claim 4 (depends on 3)

A method according to claim 3 wherein the chlorinated alkane is methylene chloride.

### Claim 5 (depends on 1)

A method according to claim 1 wherein Z is boron and m is 4.

### Claim 6 (depends on 1)

A method according to claim 1 wherein Z is phosphorus and m is 6.

### Claim 7 (depends on 1)

A method according to claim 1 wherein the salt prepared is a tetraalkylammonium salt.

### Claim 8 (depends on 7)

A method according to claim 7 wherein the alkyl groups contain about 1-6 carbon atoms.

### Claim 9 (depends on 8)

A method according to claim 8 wherein the alkyl groups are methyl, ethyl or n-butyl groups.

### Claim 10 (depends on 1)

A method according to claim 1 wherein the salt prepared is a tetraalkylphosphonium salt.

### Claim 11 (depends on 10)

A method according to claim 10 wherein the alkyl groups contain about 1-6 carbon atoms.

### Claim 12 (depends on 11)

A method according to claim 11 wherein the alkyl groups are ethyl or n-butyl groups.