Claims
- 1. A process for cleaning a solid surface which comprises treating said surface with a composition comprising an admixture of effective amounts of 1,1,2,2,3,3-hexafluorocyclopentane and one or more solvents selected from the group consisting of alcohols containing from 1 to 4 carbon atoms to form an azeotrope or azeotrope-like mixture.
- 2. The process of claim 1 wherein said surface is treated with a mixture in which all components contain no chlorine.
- 3. The process of claim 1 wherein the solid surface is a printed circuit board contaminated with flux and flux residues.
- 4. The process of claim 1 which comprises treating said surface either with an azeotrope or azeotrope-like composition comprising from about 65 to 73 weight percent 1,1,2,2,3,3-hexafluorocyclopentane and from about 27 to 35 weight percent methanol, or with an azeotrope or azeotrope-like composition comprising from about 71 to 79 weight percent 1,1,2,2,3,3-hexafluorocyclopentane and from about 21 to 29 weight percent ethanol.
- 5. The process of claim 1 wherein the solid surface is treated with 1,1,2,2,3,3-hexafluorocyclopentane and alcohol selected from the group consisting of ethanol and methanol.
- 6. The process of claim 1 which comprises treating said surface with a cleaning composition consisting essentially of effective amounts of (i) 1,1,2,2,3,3-hexafluorocyclopentane and (ii) one or more solvents selected from the group consisting of alcohols containing from 1 to 4 carbon atoms, to form an azeotrope or azeotrope-like mixture which contains between about 5 and 95 percent by weight 1,1,2,2,3,3-hexafluorocyclopentane.
- 7. The process of claim 6 wherein said cleaning composition is a mixture of 1,1,2,2,3,3-hexafluorocyclopentane with one or more compounds selected from the group consisting of methanol, ethanol, and isopropanol.
- 8. The process of claim 7 in which all the components of said cleaning composition contain no chlorine.
- 9. The process of claim 6 in which all components of said cleaning composition contain no chlorine.
- 10. The process of claim 9 wherein said cleaning composition is a mixture of 1,1,2,2,3,3-hexafluorocyclopentane and alcohol selected from the group consisting of methanol and ethanol.
- 11. The process of claim 6 which further comprises recovering 1,1,2,2,3,3-hexafluorocyclopentane and one or more of said solvents as an azeotrope.
- 12. The process of claim 1 which comprises treating said surface with an azeotrope or azeotrope-like composition comprising from about 65 to 73 weight percent 1,1,2,2,3,3-hexafluorocyclopentane and from about 27 to 35 weight percent methanol.
- 13. The process of claim 12 which further comprises recovering 1,1,2,2,3,3-hexafluorocyclopentane and methanol as an azeotrope.
- 14. The process of claim 12 wherein the azeotrope or azeotrope-like composition consists essentially of about 69 weight percent 1,1,2,2,3,3-hexafluorocyclopentane and about 31 weight percent methanol.
- 15. The process of claim 12 wherein the azeotrope or azeotrope-like composition has a boiling point at about 61.degree. C. at substantially atmospheric pressure.
- 16. The process of claim 1 which comprises treating said surface with an azeotrope or azeotrope-like composition comprising from about 71 to 79 weight percent 1,1,2,2,3,3-hexafluorocyclopentane and from about 21 to 29 weight percent ethanol.
- 17. The process of claim 16 which further comprises recovering 1,1,2,2,3,3-hexafluorocyclopentane and ethanol as an azeotrope.
- 18. The process of claim 16 wherein the azeotrope or azeotrope-like composition consists essentially of about 75 weight percent 1,1,2,2,3,3-hexafluorocyclopentane and about 25 weight percent ethanol.
- 19. The process of claim 16 wherein the azeotrope or azeotrope-like composition has a boiling point of about 71.degree. C. at substantially atmospheric pressure.
- 20. The process of claim 1 which further comprises recovering 1,1,2,2,3,3-hexafluorocyclopentane and one or more of said solvents as an azeotrope.
Parent Case Info
This is a division of application Ser. No. 07/592,174, filed Oct. 9,1990 and issued on Jan. 28, 1992 as U.S. Pat. No. 5,084,199, which is a division of application Ser. No. 07/489,275, filed Mar. 5, 1990, now abandoned.
US Referenced Citations (15)
Foreign Referenced Citations (1)
Number |
Date |
Country |
3735467 |
May 1989 |
DEX |
Non-Patent Literature Citations (3)
Entry |
Evans, et al. "Fluorocyclohexanes. Part VIII. Lithium Aluminum Hydroxide Reduction of Decafluorocyclohexene " J. Chem. Soc., 1963, pp. 4828-4834. |
Burdon, et al. "Fluorocyclopentanes. Part III. The Isomeric 1H:2H:3H--and 1H:2H:4H--Heptafluorocyclopentanes and the 1H:2H:3H:4H--Hexafluorocyclopentanes " J. Chem. Soc., 1965, pp. 2382-2391. |
Banks, et al., "Heterocyclic Polyfluoro-Compounds Part XIV Catalytic Hydrogenation of Perfluoro-(3,6-dihydro-2-methyl-2H-1,2-oxazine) and of perfluorocyclopentene" J. CHem. Soc. (C), 1968, pp. 548-550. |
Divisions (2)
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Number |
Date |
Country |
Parent |
592174 |
Oct 1990 |
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Parent |
489275 |
Mar 1990 |
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