Cleaning compositions based on 1,1,1,2,2,4,4-heptafluorobutane and C.sub.1 -C.sub.3 alcohols
First Claim
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1. An azeotropic or azeotrope-like composition consisting essentially of, by weight of said composition, about 90-99% of 1,1,1,2,2,4,4-heptafluorobutane, about 1-10% of methanol, and optionally a stabilizer, wherein said composition has a boiling point of about 30.6°
- C. at normal pressure.
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Abstract
To replace compositions based on CFC or CFHC in applications for cleaning solid surfaces (in particular defluxing), the invention proposes azeotropic or quasi-azeotropic compositions based on 1,1,1,2,2,4,4-heptafluorobutane and a C1 -C3 alcohol.
19 Citations
15 Claims
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1. An azeotropic or azeotrope-like composition consisting essentially of, by weight of said composition, about 90-99% of 1,1,1,2,2,4,4-heptafluorobutane, about 1-10% of methanol, and optionally a stabilizer, wherein said composition has a boiling point of about 30.6°
- C. at normal pressure.
- View Dependent Claims (4, 7, 10, 13)
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2. An azeotropic or azeotrope-like composition consisting essentially of, by weight of said composition, about 90-99% of 1,1,1,2,2,4,4-heptafluorobutane, about 1-10% of ethanol, and optionally a stabilizer, wherein said composition has a boiling point of about 32.4°
- C. at normal pressure.
- View Dependent Claims (5, 8, 11, 14)
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3. An azeotropic or azeotrope-like composition consisting essentially of, by weight of said composition, about 90-99.9% of 1,1,1,2,2,4,4-heptafluorobutane, about 0.1-10% of isopropanol, and optionally a stabilizer, wherein said composition has a boiling point of about 32.8°
- C. at normal pressure.
- View Dependent Claims (6, 9, 12, 15)
Specification