JPH0397794A - Azeotropic and azeotropic-like composition containing 1,1,1-trichloroethane as main composition - Google Patents

Abstract

PURPOSE:To provide the subject novel composition highly useful as a substitute for 1,1,1-trichloroethane and little in the fluctuation of the composition even when recycled, comprising sec - butyl chloride, etc., and 1,1,1-trichloroethane. CONSTITUTION:The objective composition comprises (A) sec - butyl chloride preferably in an amount of 30-55wt.% (especially 42.9wt.%) and 1,1,1- trichloroethane preferably in an amount of 45-70wt.% (especially 57.1wt.%), or comprises (B) isobutyl chloride preferably in an amount of 40-65wt.% (especially 49.4wt.%) and 1,1,1-trichloroethane, preferably in an amount of 35-60wt.% (especially 50.6wt.%).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel azeotrope and azeotropic solvent composition having excellent properties as a solvent and the like.

[Prior art] 1, 1. 1-} Lichloroethane has an appropriate boiling point and solubility, and is relatively less toxic, so it is widely used as a solvent, a diluent, etc. by taking advantage of these properties.

[Problem to be solved by the invention] Chemically particularly stable fluorocarbons Rll, R12, Rl 1
When fully halogenated hydrocarbons such as Class 3 reach the stratosphere, they are decomposed by sunlight and generate chlorine radicals that cause a chain reaction with ozone and destroy the ozone layer. Therefore, the production volume of these specific fluorocarbons has been regulated. It happened. Also, l, 1. 1- Since trichloroethane also contains chlorine, which is considered to be a cause of ozone layer destruction, there are moves to regulate the production volume of trichloroethane in the same way as specified fluorocarbons from the perspective of environmental protection.

Therefore, in place of the conventionally used 1, 1, ]-trichloroethane, there is active search for alternative substances that are less likely to deplete the ozone layer.

The present invention provides a novel 1,1.1-trichloroethane that can be used as a substitute while reducing the amount of conventional 1.1.1-trichloroethane used and satisfying the excellent properties of this substance.
The object is to provide a trichloroethane composition.

[Means for Solving the Problem] The present invention provides a method for solving the problem using one of -SeC-butyl chloride and isobutyl chloride; 1-Trichloroethane.

The composition of the present invention has an azeotropic composition and, as a cleaning solvent, has a cleaning power equivalent to that of conventional 1.1.1-1-lichloroethane, so it is sufficient without causing deterioration of the parts to be cleaned. 1, 1 which can be cleaned thoroughly and is a regulated substance.
．． The amount of 1-trichloroethane used can be significantly reduced. In addition, because they have very similar physical properties, they have the advantage of being able to be used in a wide variety of cleaning methods without making major changes to the specifications of equipment such as washing machines that are currently in use. Therefore, it is extremely useful as a substitute for i,i,x-trichloroethane. Furthermore, it has many advantages such as less compositional fluctuation even after recycling.

Compositions 1, 1 of the present invention. The mixing ratio of 1-trichloroethane and -see-butyl chloride is 1,1.1
- 45-70% by weight of trichloroutane and sec chloride
An azeotrope-like composition of 30-55% by weight butyl is preferred, more preferably an azeotrope-like composition of 57.1% by weight 1,1,1 trichloroethane and 42.9% by weight -SeC-butyl chloride.

1. Composition of the present invention. , 1,1-trichloroethane and isobutyl chloride at a mixing ratio of 1.1. An azeotrope-like composition of 35-60% by weight of 1-trichloroethane and 40-65% by weight of isobutyl chloride is preferred, more preferably an azeotrope-like composition of 50.6% by weight of 1,1.1-trichloroethane and 49.4% by weight of isobutyl chloride. It has a boiling composition.

The common composition ratio of this azeotropic composition is ±1 due to the influence of the purity of the 1.1.1-tricloethane to be mixed, measurement error, etc.
, it fluctuates by about 0% by weight.

Other components may be further added to the composition of the present invention depending on the intended use. For example, in applications as a solvent, bentane, inventane, hexane, isohexane, neohexane, hebutane, isohexane,
．． Hydrocarbons such as 3-dimethylbutane and cyclopentane, nitroalkanes such as nitromethane, nitroethane and nitrobroban, diethylamine, triethylamine,
Amines such as isobrobylamine, butylamine, isobutylamine, methanol, ethanol, n-propyl alcohol, i-propyl alcohol, n-butyl alcohol. Alcohols such as monobutyl alcohol, S-butyl alcohol, 1-butyl alcohol, methyl cellosolve, tetrahydrofuran. 1. Ethers such as 4-dioxane, ketones such as acetone, methyl ethyl ketone, methyl butyl ketone, ethyl acetate, proyl acetate,
Esters such as butyl acetate, dichloromethane, tran
s-1.2-dichloroethylene, cis-1. Halogenated hydrocarbons such as 2-dichloroethylene, others, 1
, 1,2-trichloro-2,2-difluoroethane, 1
, 1,2,2-tetrachloro-1,2-difluoroethane, 1,1-dichloro-2,2,3,3,3-pentafluorobroban, and other fluorocarbons can be added as appropriate.

The azeotrope and azeotrope-like compositions of the present invention are similar to conventional 1. 1.
Like 1-trichloroethane, it can be used for various purposes,
Especially when used as a solvent, conventional 1. 1. It is suitable as a substitute substance because it has the same dissolving power as 1-trichloroethane.

Specific uses of solvents include flux, grease,
Removal agents for oil, wax, ink, etc., paint solvents, extractants, glass, ceramics, plastics, rubber, various metal parts, especially IC parts, electrical equipment, precision machinery, optical lens cleaning and draining agents, etc. can be given. As a cleaning method, hand wiping, dipping, spraying, shaking, ultrasonic cleaning, steam cleaning, etc. may be used.

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

Example 1 1000 g of a mixture consisting of each composition shown in Table 1 was placed in a distillation flask, and a rectification column with 20 theoretical plates was used.
Distillation was carried out under atmospheric pressure to obtain 200 g of each fraction. Table 2 shows the distillation temperature and gas chromatograph measurement results of the fraction at this time.

Table 1 Table 2 Example 2 A machine oil cleaning test was conducted using the composition of the present invention. SUS304 test beads (25 mm x 30 mm)
x 2mm thick) with machine oil (CQ-30, manufactured by Nippon Oil)
After being immersed in the composition, the sample was washed by immersion in the composition of the present invention for 5 minutes. As a comparative example, 1. Similar tests were conducted for 1 to trichloroethane.

Table 3 shows the degree of machine oil removal.

Table 3 0: Can be removed well, ○: Almost good △: A trace amount remains,
×: Significant residual amount [Effect of the invention] The azeotrope and azeotrope-like composition of the present invention have the same amount as the conventional 1. 1,
It can be used as a substitute material while satisfying the excellent properties of l-trichloroethane, and the composition change is small even when recycled, so it can be used as a substitute for conventional l-trichloroethane.
It has the advantage that it can be used in the same way as trichloroethane alone and does not require major changes in conventional technology. In addition, as a solvent, it has excellent removal performance of tti machine oil, etc., so i, i,
I-Ideal as a degreasing cleaning solvent in place of trichloroethane.

Claims (1)

[Scope of Claims] Azeotropic and azeotrope-like compositions comprising any one of 1, sec-butyl chloride and isobutyl chloride and 1,1,1-trichloroethane. 2,1,1,1-trichloroethane 45-70% by weight,
and 30 to 55% by weight of -sec-butyl chloride. The azeotropic composition according to claim 1, consisting of 57.1% by weight of 3,1.1,1-trichloroethane and 42.9% by weight of -sec-butyl chloride. 4,1,1,1-trichloroethane 35-60% by weight,
and 45 to 60% by weight of isobutyl chloride.
The azeotrope-like composition described in . The azeotropic composition according to claim 1, consisting of 50.6% by weight of 5,1,1,1-trichloroethane and 49.4% by weight of isobutyl chloride.