# US 4,961,869 A · Ternary azeotropic compositions of 2,3-dichloro-1,1,1,3,3-pentafluoropropane with trans-1,2-dichloroethylene and methanol

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- Number: US 4,961,869 A
- Document ID: US4961869A
- Status: Granted
- Kind: A
- Application number: 07/389,383
- Filed: 1989-08-03
- Granted: 1990-10-09
- Earliest claimed: 1989-08-03
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Michael E. Eggers; Abid N. Merchant
- Web page: https://patentgrep.com/patent/US4961869A

## CPC

- C11D 7/5081: {the oxygen-containing solvents being alcohols only}
- C23G 5/02851: {C2HCl2F5}
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C23G: CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS

## Abstract

Azeotropic mixtures of 2,3-dichloro-1,1,1,3,3-pentafluoropropane (HCFC-225da) and trans-1,2-dichloroethylene (HCC-1130) with methanol, the azeotropic mixtures being useful in solvent cleaning applications.

## Claims

### Claim 1

The azeotropic composition consisting essentially of from about 43-53 weight percent 2,3-dichloro-1,1,1,3,3-pentafluoropropane, about 42-52 weight percent trans-1,2-dichloroethylene and about 3-9 weight percent methanol wherein the composition has a boiling point of about 41.0.degree. C. at substantially atmospheric pressure.

### Claim 2 (depends on 1)

The azeotropic composition of claim 1 wherein the composition is about 47.7 weight percent 2,3-dichloro-1,1,1,3,3-pentafluoropropane, and about 46.7 weight percent trans-1,2-dichloroethylene and about 5.6 weight percent methanol.

### Claim 3 (depends on 1)

A process for cleaning a solid surface comprises treating said surface with the azeotropic composition of claim 1.

### Claim 4 (depends on 3)

The process of claim 3, wherein the solid surface is a printed circuit board contaminated with flux and flux-residues.

### Claim 5 (depends on 4)

The process of claim 4, wherein the solid surface is a metal.