Composition Comprising Trans 1,2-Dichloroethylene

Abstract

The present invention relates to a composition based on trans-1,2-dichloroethylene. A more particular subject-matter of the invention is a nonflammable composition comprising trans-1,2-dichloroethylene and pentafluoropropane and its use.

Description

EXPERIMENTAL PART

Examples 1-3

Three compositions according to the present invention are prepared (Examples 1-3) and then the flash point is determined under standard conditions (ASTM D 3828).

Examples C1 and C2 correspond to compositions not in accordance with the present invention.

The results are given in the table below.

	trans-1,2-	1,1,1,3,3-
	Dichloroethylene	Pentafluoropropane	Flash Point
Example	(% by weight)	(% by weight)	ASTM D 3828
C1	100%	0%	−11° C. to −4° C.
C2	99%	1%	−11° C. to −8° C.
1	98%	2%	No flash point
2	95%	5%	No flash point
3	85%	15%	No flash point

Example 4

A composition comprising 19% of 1,1,1,3,3-pentafluoropropane and 81% of trans-1,2-dichloroethylene is allowed to evaporate at ambient temperature (22° C.) and atmospheric pressure. The composition over time is subsequently determined using gas chromatography. After 13 hours, the level of 1,1,1,3,3-pentafluoropropane in the composition remains sufficiently high and greater than 2%. This composition thus remains nonflammable over time.

The same test is repeated with a composition comprising 5% of 1,1,1,3,3-pentafluoropropane and 95% of trans-1,2-dichloroethylene. After 8 hours, the level of 1,1,1,3,3-pentafluoropropane in the composition remains sufficiently high and greater than 2%. This composition thus remains non-flammable (no flash point is observed) over time.

Examples 5-7

Test to determine the solubilizing power of the various compositions.

Several compositions (2, 5 and 10% by weight of 245fa and the remainder to 100% by weight being trans-1,2-dichloroethylene) according to the present invention are prepared in flasks cooled to −7° C. to limit the evaporation of the 1,1,1,3,3-pentafluoropropane.

10 ml of each composition are subsequently poured, using a graduated measuring cylinder cooled beforehand to 5° C., into a test tube equipped with a screw top cooled beforehand to 5° C. The amount of whole oil necessary to obtain the desired percentage of oil by volume is then added to the test tube using a propipette; the contents of the test tube are agitated for 30 s and are left standing at ambient temperature. After one hour, the appearance or nonappearance of separate oil/solvent phases is recorded.

Examples C3 and C4 correspond to two compositions not in accordance with the present invention.

The results of the test of the solubilizing power are listed in the table below.

	Example
	5	6	7	C3	C4
	% by weight of	2%	5%	10%	50%	80%
	245fa
	% of oil by
	volume
	1%					NS
	9%	S	S	S		NS
	16%	S	S	S
	33%	S	S	S	NS
	50%	S	S	S
	60%	S	S	S
	S: a single phase
	NS: appearance of separate phases

The % of oil by volume is defined as being the ratio volume of oil×100/total volume

Whole oil: Shell, Macron 1665 S 32 (multiple spindle cutting oil)

Claims

1. Composition comprising x % by weight of trans-1,2-dichloroethylene, with 80<x<99, and y % by weight of 1,1,1,3,3-pentafluoropropane, with 1<y<20, and which does not exhibit a flash point under standard determination conditions (ASTM Standard D 3828).

2. Composition according to claim 1, comprising from 90 to 98% by weight of trans-1,2-dichloroethylene and from 2 to 10% by weight of 1,1,1,3,3-pentafluoropropane.

3. Composition according to claim 1 or 2, comprising from 95 to 98% by weight of trans-1,2-dichloroethylene and from 2 to 5% by weight of 1,1,1,3,3-pentafluoropropane.

4. Solvent, characterized in that it is composed of a composition according to any one of the preceding claims.

5. Expanding agent characterised in that it is composed of composition according to claims 1 to 4.