JPH02202840A - 1-chloro-2,2,3,3-tetrafluoropropane azeotropic and pseudo-azeotropic composition - Google Patents

Abstract

PURPOSE:To provide the subject nonflammable composition suitable as an alternate CFC or a cleansing solvent by comprising 1-chloro-2,2,3,3-tetrafluoropropane and 1,2-dichloro-1,1-difluoroethane. CONSTITUTION:A composition comprises 18-58wt.%, especially preferably 38wt.%, of 1-chloro-2,2,3,3-tetrafluoropropane and 42-82wt.%, especially preferably 62wt.% of 1,2-dichloro-1,1-difluoroethane. The composition is nonflammable, has the same or more excellent characteristics as or than those of the conventional CFCs, does not cause the change of the composition thereof on the recyclization because of having an azeotropic point and can be used in the same manner as single of the conventional CFCs. The composition has a higher dissolving power than the conventional 1,1,2-trichloro-1,2,2-trifluoroethane especially when used as a solvent, thereby being suitable as a substitute for the CFCs.

Description

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

[Prior art] Fluorinated hydrocarbon compounds pIJ (hereinafter simply referred to as fluorocarbons) are mostly non-toxic, nonflammable, and chemically stable.
Since various types of CFCs with different standard boiling points are available, taking advantage of these properties, 1,1,2-trichloro-1,2,2 can be used as a solvent, blowing agent, propellant, refrigerant, etc.
-trifluoroethane (R113), trichloromonofluoromethane (R11) as a blowing agent, and dichlorodifluoromethane (R12) as a propellant or refrigerant.

[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 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 provides 1-chloro-2,2,3,3-tetrafluoropropane (R244ca) and 1,2-dichloro-1,
This invention relates to fluorinated hydrocarbon azeotropic and near-azeotropic compositions consisting of 1-difluoroethane (R132b).

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, it has the advantage that there is little change in composition even after recycling, and it can be used in the same way as conventional single fluorocarbons, without requiring major changes to the conventional technology. The composition of the present invention contains 18 to 58% by weight of R244ca and R132b.
is 42 to 82% by weight, preferably R244ca is 28% by weight.
~48 wt.% and R132b is 52-72 wt.%, more preferably about 38 wt.% of R244ca and R132b.
32b.

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, isopentane, hexane, isohexane, neohexane, heptane, isohexane,
, 3-dimethylbutane, hydrocarbons such as cyclopentane, nitroalkanes such as nitromethane, nitroethane, 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, tetra Hydrofuran, ethers such as 1,4-dioxane, acetone,
Methyl ethyl ketone, = 4 = Ketones such as methyl butyl ketone, esters such as ethyl acetate, propyl acetate, butyl acetate, dichloromethane,
trans-1,2-dichloroethylene, cis-1,
Halogenated hydrocarbons such as 2-dichloroethylene and 2-bromopropane, and fluorocarbons other than those of the present invention such as 1,1-dichloro-1-fluoroethane can be added as appropriate.

The azeotropic and near-azeotropic compositions of the present invention consisting of R244ca and R132b can be used in various applications such as heat carriers and blowing agents, similar to conventional fluorocarbons, and especially when used as solvents,
It is suitable because it has higher dissolving power than conventional R113. Specific uses of solvents include removers for flux, grease, oil, wax, and ink, paint solvents, extractants, glass, ceramics, plastic deck, rubber, various metal products, especially IC parts, and electrical equipment. , cleaning agents for precision machinery, optical lenses, etc., and draining agents.

As cleaning methods, hand wiping, dipping, 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℃) 42 R132b (Boiling point 46.8℃) 58 As a result, 44
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
38R132b
62 Example 2 A machine oil cleaning test was conducted using the composition of the present invention (R244ca/R132b=38% by weight/62% by weight).

5US-304 test piece (25mm x 30m+
nX 2 mm thick) was immersed in machine oil (Nippon Oil Co., Ltd. CQ-30) and then immersed in the composition of the present invention for 5 minutes.

As a result, it was confirmed that machine oil could be removed as well as R113.

Example 3 The composition of Example 2 (R244ca/R132b=38% by weight/62% by weight) was subjected to tag measurement method (J Is-
2265), it was confirmed that it had no flash point and was nonflammable.

[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.

In addition, compared to R113 alone, which is often used as a solvent,
It is suitable as a cleaning solvent in place of R113 because it has excellent ability to dissolve and remove flux, oil, etc.

−7=

Claims (1)

[Scope of Claims] A fluorinated hydrocarbon azeotropic composition comprising 1,1-chloro-2,2,3,3-tetrafluoropropane and 1,2-dichloro-1,1-difluoroethane. 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 1,2-dichloro-1,1-difluoroethane. A fluorinated hydrocarbon-based pseudoazeotropic composition consisting of 3,1-chloro-2,2,3,3-tetrafluoropropane and 1,2-dichloro-1,1-difluoroethane. 18-58% by weight of 4,1-chloro-2,2,3,3-tetrafluoropropane and 1,2-dichloro-1,1-
4. A composition according to claim 3, comprising 42 to 82% by weight of difluoroethane.