Solvent composition comprising mixture of polyfluoroalkane and l

Details Solvent composition comprising mixture of polyfluoroalkane and l Solvent composition comprising mixture of polyfluoroalkane and l

1994-02-28

1995-06-13

Skaling, Linda

Compositions

Water-softening or purifying or scale-inhibiting agents

134 40, 252170, 252194, 252364, 252DIG9, C11D 730, C11D 750

Patent

active

054240026

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a solvent composition comprising a mixture of polyfluoroalkanes and lower alcohols.
In this specification and claims, "%" and "parts" mean "weight %" and "weight parts", respectively.


BACKGROUND ART

Trichlorofluoroethane (hereinafter referred to as CFC113), one of chlorofluoroethane compounds, has been widely used singly or in a form of a mixture or azeotropic composition with another organic solvent as a solvent, cleaning agent, etc., since CFC113 has excellent properties, such as (i) nonflammability, (ii) low toxicity in vivo, selectively solubilizing fats and oils, grease, wax and the like without attacking on plastics, rubber and like high polymers.
It has become an issue that CFC113 and like chlorofluorocarbon compounds substituting chlorine and fluorine atoms for all hydrogen atoms of hydrocarbons (hereinafter referred to as perhalocarbons) destruct the ozonesphere, as a result, cause an environmental pollution on a global scale. It is an urgent problem to reduce the usage of perhalocarbons progressively, and to totally abolish perhalocarbons soon.
However, a useful material which is capable of substitution of CFC113 used singly or in an azeotropic mixture with other organic solvent, and material which does not destruct an ozone layer has not been found yet.
Further, it is essential to provide a mixed solvent imparted a variety of functions by mixing another organic solvent according to applications and objects thereof. It is important that control of the mixed solvent, when used, should be easy, and that the mixed solvent can be recovered and reused. It is preferred that steam wash can be performed. However, finding such a composition is, in fact, very difficult, and such an azeotropic mixture has not been discovered.


DISCLOSURE OF THE INVENTION

The inventors of the present invention, who were engaged in intensive research in view of the prior art, discovered that a composition comprising polyfluorobutane having a trifluoromethyl group at 2-position and a lower alcohol substantially meet the requirement mentioned above. The present invention has been accomplished.
Thus, the invention provides a mixed solvent composition shown below: polyfluoroalkanes and at least one selected from lower alcohols, in which said polyfluoroalkanes are selected from the group consisting of compounds represented by the formula (1): said lower alcohols are selected from the group consisting of methyl alcohol, ethyl alcohol, n-propyl alcohol and isopropyl alcohol."
A fluoroethyl group having 1 to 4 fluorine atoms represented by R includes: CF.sub.3 ; CF.sub.2 H;
Examples of preferred fluoroethyl groups represented by R are CF.sub.2 CF.sub.2 H and CH.sub.2 CF.sub.2 H.
In the invention, at least one of compounds of formula (1) and at least one selected from the group consisting of methyl alcohol, ethyl alcohol, n-propyl alcohol and isopropyl alcohol are mixed in a specific proportion. Preferable compositions comprising a compound of formula (1) and a lower alcohol are as follows: 2-trifluoromethyl-1,1,1,2,3,3,4,4-octafluorobutane and methyl alcohol and/or ethyl alcohol; and and at least one selected from the group consisting of methyl alcohol, ethyl alcohol, n-propyl alcohol or isopropyl alcohol.
A preferred blending ratio of said composition is, in 100 parts of the composition, accomplished by blending 96.7-97.9 parts of 2-trifluoromethyl-1,1,1,2,3,3,4,4-octafluorobutane with 3.3-2.1 parts of methyl alcohol and/or ethyl alcohol, or by blending 93.3-95.8 parts of 2-trifluoromethyl-1,1,1,2,4,4-hexafluorobutane and 6.7.-4.2 parts of methyl alcohol and/or ethyl alcohol and/or isopropyl alcohol.
Specifically, the more preferred compositions of the invention are: 96.7% of 2-trifluoromethyl-1,1,1,2,3,3,4,4-octafluorobutane and 3.3% of methyl alcohol; 97.9% of 2-trifluoromethyl-1,1,1,2,3,3,4,4-octafluorobutane and 2.1% of ethyl alcohol; 93.3% of 2-trifluoromethyl-1,1,1,2,4,4-hexafluorobutane and 6.7% of methyl alcohol; 95.4% of 2-trifluoromethyl-1,1,1,2,4,4-hexafluorobutane an

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Chemical Abstract No. 60:1572oh, Chambers et al., "Telemerization reactions in the synthesis of Models for Same Fluorocarbon Polymers", Tetrahedron 20(3) pp. 497-506 1964 Abstract published Jun. 1964.
Grant & Hackh's Chemical Dictionary Fifth Edition, McGraw-Hill Book Co. N.Y. *1987 pp. 402, 549, 556.

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