JPH02202841A - 1-chloro-2,2,3,3-tetrafluoropropane azeotropic and azeotropic-like mixture - Google Patents

Abstract

PURPOSE:To provide the subject nonflammable composition enabling to reduce the using amount of CFCs and useful as an alternate CFC by comprising 1- chloro-2,2,3,3-tetrafluoropropane and 1,1,2-trichloro-1,2,2-trifluoroethane. CONSTITUTION:A composition comprises 6-46wt.%, especially preferably 26wt.%, of 1-chloro-2,2,3,3-tetrafluoropropane and 54-94wt.%, especially preferably 74wt.%, of 1,1,2-trichloro-1,2,2-trifluoroethane (R113). The composition is nonflammable, enables to reduce the using amount of the CFCs while satisfying the excellent characteristics of the CFCs, does not cause the change of the composition thereof on the recyclization because of having an azeotropic point, can be used in the same manner as one of the conventional CFCs, does not require the wide change of the conventional techniques and further has other advantages.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a novel fluorinated hydrocarbon azeotrope and azeotrope-like mixture that can be used as a CFC substitute and has excellent properties as a solvent, etc. .

``Conventional technology'' Fluorinated hydrocarbon compounds (hereinafter simply referred to as chlorofluorocarbons) are mostly non-toxic, nonflammable, and chemically stable, and various types of fluorocarbons with different standard boiling points are available, making use of these characteristics. 1.1.2 Trichloro-1,2,2-trifluoroethane (R113) is used as a solvent, blowing agent, propellant, or refrigerant, trichloromonofluoromethane (R11) is used as a blowing agent, and dichloro is used as a propellant or refrigerant. Difluoromethane (R12'') is used.

[Problem to be solved by the invention] R11, R12, and R113, which are particularly stable chemically, have a long life in the troposphere and diffuse into the stratosphere, where they are decomposed by sunlight and generate chlorine radicals, which are converted into ozone. Conventional regulations on the use of these fluorocarbons have been implemented because they are believed to cause a chain reaction and destroy the ozone layer. For this reason, there is active search for alternative fluorocarbons that are less likely to deplete the ozone layer in place of these conventional fluorocarbons.

An object of the present invention is to provide a new fluorocarbon mixture that can be used as a fluorocarbon substitute while reducing the amount of conventional fluorocarbons used and satisfying the excellent properties of the fluorocarbons.

[Means for Solving the Problems] The present invention provides 1-chloro-2,2,3,3-tetrafluoropropane (R244ca) and 1,1.2-)cyclo-1,2.2-)-lifluoroethane. The present invention relates to fluorinated hydrocarbon azeotropic and azeotrope-like mixtures consisting of (R113). The mixture of the present invention is non-flammable and has an azeotropic composition, in particular the conventional R113 as a cleaning solvent.
Since it has the same detergency as that of the simple substance, it is extremely useful as a substitute for R113.

Further, it has the advantage that there is little change in composition even after recycling, it can be used in the same way as conventional single fluorocarbons, and it does not require major changes in conventional technology. The mixture of the present invention contains 6 to 46% by weight of R244ca and 5% by weight of R113.
4 to 94% by weight, preferably 16 to 3 R244ca
6% by weight and R113 by weight of 64-84%, more preferably an azeotrope consisting of about 26% by weight of R244ca and about 74% by weight of R113.

Other components may be further added to the mixture of the present invention depending on the intended use. For example, when used as a solvent, pentane, i, sopentane, hexane, isohexane, neohexane, heptane, isohexane,
2. Hydrocarbons such as 3-dimethylbutane and cyclopentane, nitroalkanes such as nitromethane, nitroethane, and nitropropane, amines such as diethylamine, triethylamine, isopropylamine, butylamine, and isobutylamine, methanol, ethanol, n-propyl Alcohol, alcohols such as i-propyl alcohol, n-butanol, i-butanol, S-butanol, t-butanol, ethers such as methyl cellosolve, tetrahydrofuran, 1,4-dioxane, acetone, methyl ethyl ketone, methyl butyl ketone, etc. Ketones, Nisdels such as ethyl acetate, propyl acetate, butyl acetate, halogenated hydrocarbons such as dichloromethane, trans-1,2-dichloroethylene, cis-1,2-dichloroethylene, 2-bromopropane, etc., 1 ，
Fluorocarbons other than those of the present invention, such as 1-dichloro-1-fluoroethane, etc. can be added as appropriate.

The azeotrope and azeotrope-like mixture of the present invention consisting of R244ca and R113 can be used for various purposes such as heat carriers and blowing agents, similar to conventional fluorocarbons, and especially when used as a solvent, the azeotrope and azeotrope-like mixture of the present invention can be used for various purposes such as heat transfer media and blowing agents. It is suitable because it has a dissolving power. Specific uses of solvents include removers for flux, grease, oil, wax, and ink, paint solvents, extractants, glass, ceramics, plastics, rubber, various metal products, especially IC parts, electrical equipment, Examples include cleaning agents and draining agents for precision instruments, optical lenses, etc.

As cleaning methods, hand wiping, dipping, spray shaking, ultrasonic cleaning, steam cleaning, etc. may be used.

[Example child Examples of the present invention are shown below.

Example 1 1000 g of a solvent mixture having the following composition was placed in a distillation flask and distilled under atmospheric pressure using a rectification column with 20 theoretical plates.

(Composition) (Weight%) R244ca
(Boiling point 54°C) 20 R113 < 4 points 47.6°C) 80 As a result, 410 g of a fraction was obtained at 47°C.

As a result of measuring this product with a gas chromatograph, it had the following composition.

(Composition) (Weight%) R244ca
26R11374 Example 2 Mixture of the present invention (R244ca/R113=26%
/74 weight percent) was used to conduct a machine oil cleaning test.

5US-304 test piece (25mm x 30mm
X 2mm thick) was immersed in machine oil (Nippon Oil Co., Ltd. CQ-30>) and then immersed in the mixture of the present invention for 5 minutes. As a result, it was confirmed that machine oil could be removed as well as R113. Ta.

Example 3 The mixture of Example 2 (R244ca/R113 = 26% by weight/74% by weight) was tested using the tag method (JIS-2).
265), it was confirmed that it had no flash point and was nonflammable.

[Effects of the Invention] The fluorinated hydrocarbon mixture of the present invention is nonflammable and satisfies the excellent properties of conventional fluorocarbons, while reducing the amount of fluorocarbons used, and has an azeotropic point. Therefore, it has the advantage that there is no change in composition during recycling, it can be used in the same way as conventional single fluorocarbons, and it does not require major changes to conventional technology.

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Claims (1)

[Claims] Fluorinated hydrocarbon azeotrope consisting of 1,1-chloro-2,2,3,3-tetrafluoropropane and 1,1,2-trichloro-1,2,2-trifluoroethane blend. 26% by weight of 2,1-chloro-2,2,3,3-tetrafluoropropane and 1,1,2-trichloro-1,2,
A mixture according to claim 1, consisting of 74% by weight of 2-trifluoroethane. A fluorinated hydrocarbon azeotrope-like mixture consisting of 3,1-chloro-2,2,3,3-tetrafluoropropane and 1,1,2-trichloro-1,2,2-trifluoroethane. 6-46% by weight of 4,1-chloro-2,2,3,3-tetrafluoropropane and 1,1,2-trichloro-1,
A mixture according to claim 3, consisting of 54 to 94% by weight of 2,2-trifluoroethane.