JPH02202836A - 1,3-dichloro-1,1,2,2,3-pentafluoropropane azeotropic and azeotropic-line mixture - Google Patents

Abstract

PURPOSE:To provide a new fluorinated hydrocarbon azeotropic and azeotropic- like mixture useful as an alternate CFC by comprising 1,3-dichloro-1,1,2,2,3- pentafluoropropane and 1,1,2-trichloro-1,2,2-trifluoroethane. CONSTITUTION:A fluorinated hydrocarbon azeotropic and azeotropic-like mixture comprises 1,3-dichloro-1,1,2,2,3-pentafluoropropane (R225cb) and 1,1,2- trichloro-1,2,2-trifluoroethane (R113). The mixture is preferably an azeotropic mixture comprising 12-52wt.% of the R225cb and 48-88wt.% of the R113, especially approximately 32wt.% of the R225cb and approximately 68wt.% of the R113. The mixture is nonflammable and enables to reduce the using amount of CFC while satisfying the characteristics of the CFC. Since the mixture has an azeotropic point, the composition of the mixture is not changed when the mixture is recycled. The mixture can be further used in the same manner as the single CFC and does not require any wide change of techniques for using the mixture.

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 7 substitute and has excellent properties as a solvent, etc. .

[Prior art] Fluorinated hydrocarbon compounds (hereinafter simply referred to as fluorocarbons) are mostly non-toxic, nonflammable, and chemically stable, and various fluorocarbons with different standard boiling points are available, so they can be used to take advantage of these characteristics. 1.1.2-Trichloro-1,2,2-trifluoroethane (R113) is used as a solvent, blowing agent, propellant, or refrigerant, and trichloromonofluoromethane (R11) is used as a blowing agent. Dichlorodifluoromethane (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 = 1 chlorine radicals are generated by decomposition by sunlight. Conventional regulations on the use of these fluorocarbons have been implemented because they are believed to 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 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 1,3-dichloro-1,1,2,2,3-pentafluoropropane (R225cb) and 1,1,2-
) Cycloro 1.2.2g, i, j noroloethane (R
113) of fluorinated hydrocarbon azeotropes and azeotrope-like mixtures.

The mixture of the present invention is nonflammable, has an azeotropic composition, and has the same cleaning power as conventional R113 alone as a cleaning solvent, 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 mixture of the present invention contains 12 to 52% by weight of R225cb and 48 to 88% by weight of R113, specifically, 22 to 52% by weight of R225cb.
42% by weight of R113 and 58-78% by weight, more preferably about 32% by weight of R225cb and R113.
It is an azeotrope consisting of about 68% by weight of

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, isopentane, hexane, isohexane, neohexane, heptane, isohexane,
, 3-dimethylbutane, hydrocarbons such as cyclobencune, 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, tetrahydrofuran , ethers such as 1,4-dioxane, acetone,
Ketones such as methyl ethyl ketone and methyl ethyl ketone, esters such as ethyl acetate, propyl acetate and butyl acetate, halogenated hydrocarbons such as dichloromethane, trans-1,2-dichloroethylene, cis-1,2-dichloroethylene and 2-bromopropane , Others, 1.1
-Dichloro-1-fluoroethane and other fluorocarbons other than those of the present invention can be added as appropriate.

The azeotrope and azeotrope-like mixture of the present invention consisting of R225cb 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 medium and blowing agent. 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] 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) (% by weight) R225cb
(boiling point 55.4℃) 30R113 (boiling point 47.6℃)
70 As a result, 380 g of a fraction was obtained at 46°C.

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

(Composition) (% by weight) R225cb
32R11368 Example 2 Mixture of the present invention (R225cb/R113=32%
/68% by weight) was used to conduct a machine oil cleaning test.

5US-304 test piece (25mm x 30mm
X 2 mm 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.

Example 3 The mixture of Example 2 (R225cb/R113 = 32% by weight/68% 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.

=7

Claims (1)

[Claims] 1,1,3-dichloro-1,1,2,2,3-pentafluoropropane and 1,1,2-trichloro-1,2,
A fluorinated hydrocarbon azeotrope consisting of 2-trifluoroethane. Claim 1 consisting of 32% by weight of 2,1,3-dichloro-1,1,2,2,3-pentafluoropropane and 68% by weight of 1,1,2-trichloro-1,2,2-trifluoroethane. The mixture described in. 3,1,3-dichloro-1,1,2,2,3-pentafluoropropane and 1,1,2-trichloro-1,2,
A fluorinated hydrocarbon azeotrope-like mixture consisting of 2-trifluoroethane. From 12 to 52% by weight of 4,1,3-dichloro-1,1,2,2,3-pentafluoropropane and from 48 to 88% by weight of 1,1,2-trichloro-1,2,2-trifluoroethane 4. The mixture according to claim 3.