JPH02202838A - 1-chloro-2,2,3,3-tetrafluoropropane azeotropic and azeotropic-like composition - Google Patents

Abstract

PURPOSE:To provide a novel fluorinated hydrocarbon azeotropic and azeotropic- like composition capable of being used as an alternate CFC and having excellent characteristics as a solvent by comprising 1-chloro-2,2,3,3-tetrafluoropropane and dichloromethane. CONSTITUTION:A fluorinated hydrocarbon azeotropic and azeotropic-like composition comprises 1-chloro-2,2,3,3-tetrafluoropropane (R224ca) and dichloromethane. The composition is preferably an azeotropic composition comprising 18-58wt.% of the R244ca and 42-82wt.% of the dichloromethane, especially approximately 38wt.% of the R244ca and approximately 62wt.% of the dichloromethane. The composition is nonflammable and has the same or more excellent characteristics as or than those of CFCs. Since the composition has an azeotropic point, the composition does not cause the change of the composition thereof when recycled, can be used in the same manner as a single CFC and can be used as such without requiring any wide change of techniques for the use. The composition is preferable as a cleansing solvent replaced with CFCs.

Description

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

[Prior art] Fluorinated hydrocarbon compounds (hereinafter simply referred to as fluorocarbons) are mostly non-toxic, non-flammable, and chemically stable, and various types of fluorocarbons with different standard boiling points are available. 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 valve stand in the troposphere and diffuse into the stratosphere, where they are decomposed by sunlight and generate chlorine radicals. Conventional regulations on the use of these fluorocarbons have been implemented because they cause a chain reaction with ozone 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 composition containing a novel hydrogen-containing chlorofluoropropane-based fluorocarbon with a carbon number of 3, which has various excellent properties equivalent to conventional fluorocarbons and is useful as a fluorocarbon substitute. It is something to do.

[Means for Solving the Problems] The present invention relates to fluorinated hydrocarbon azeotropic and azeotrope-like compositions consisting of 1-chloro-2,2,3,3-tetrafluoropropane (R244ca) and dichloromethane. be. The composition of the present invention is nonflammable, has an azeotropic composition, and has higher detergency as a cleaning solvent than conventional R113 alone, so it is extremely useful as a substitute for R113.

Furthermore, R244ca is the composition of the present invention, which has the advantage that there is little change in composition even when recycled, and it can be used in the same way as conventional single fluorocarbons, without requiring major changes in conventional technology. 18-58% by weight of R244ca and 42-82% by weight of dichloromethane, more preferably about 38% by weight of R244ca and about 62% by weight of dichloromethane. It is an azeotropic composition consisting of % by weight.

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

The azeotrope and azeotrope-like composition of the present invention, which consists of R244'ca and dichloromethane, can be used in various applications such as heat carriers and blowing agents, similar to conventional fluorocarbons, and especially when used as a solvent, it has a higher level of performance than conventional R113. It is suitable because it has high 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. Cleaning methods include hand wiping, soaking, spray shaking,
Ultrasonic cleaning, steam cleaning, etc. may be used.

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

Example 1 1000 g of a solvent composition having the composition shown below 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℃) 50 Dichloromethane (Boiling point 39.8℃) 50 As a result, 35
400 g of fraction were obtained at .degree.

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

(Composition) (Weight%) R244ca
38 dichloromethane 62 Example 2 Composition of the present invention (R244ca/dichloromethane/38
A flux cleaning test was conducted using 62% by weight).

Flux (AL-AL-4 manufactured by Kumura Manufacturing Co., Ltd.) was applied to the entire surface of the printed circuit board, and after baking it in an electric furnace at 200° C. for 2 minutes, it was immersed in the composition of the present invention for 1 minute. the result,
It was confirmed that flux could be removed well.

Example 3 Composition of Example 2 (R244ca/dichloromethane.3
8wt/62wt%) using the tag-type measurement method (JTS
-2265), it was confirmed that it had no flash point and was non-flammable.

[Effects of the Invention] The fluorinated hydrocarbon composition of the present invention is nonflammable and has properties equivalent to or superior to those of conventional fluorocarbons. Furthermore, since it has an azeotropic point, there is no change in composition during recycling, and it can be used in the same way as conventional single chlorofluorocarbons, which has the advantage of being able to be applied as is without requiring major changes to the conventional technology.

Claims (1)

[Scope of Claims] A fluorinated hydrocarbon azeotropic composition comprising 1,1-chloro-2,2,3,3-tetrafluoropropane and dichloromethane. A composition according to claim 1, consisting of 38% by weight of 2,1-chloro-2,2,3,3-tetrafluoropropane and 62% by weight of dichloromethane. A fluorinated hydrocarbon azeotrope-like composition comprising 3,1-chloro-2,2,3,3-tetrafluoropropane and dichloromethane. 4. A composition according to claim 3, consisting of 18-58% by weight of 4,1-chloro-2,2,3,3-tetrafluoropropane and 42-82% by weight of dichloromethane.