DE2853848A1 - Stabilising tetra:chloroethylene to prevent contact metal corrosion - by adding alkyl-morpholine, alkylphenol, di:isopropylamine, cyclohexene oxide and opt. epoxy-propanol - Google Patents

Abstract

Stabilised C2Cl4 contains, by wt. 0.001-0.01 (pref. 0.004-0.008) % of >=1 N- 1-5C-alkyl-morpholine, (I), opt. ring-substd. by 4 C-alkyl; 0.001-0.01 (pref. 0.004-0.008)% of >=1 alkylphenol, (II), contg. 1-18C alkyl in o- and/or p-position; 0.0005-0.002 (pref. 0.0008-0.0015) % diisopropylamine, (III), and 0.05-0.5 (pref. 0.1-0.3) % cyclohexene oxide (IV). C2Cl4 is stabilised against oxidative decomposition in contact with metals, alloys, metal salts, cutting oils, UV, light and heat. Acid absorption capacity is increased. The components act synergetically. The addn. of (IV) increases stabilising activity and prevents corrosion of Fe, Cu, Zn and Al.

Description

Additional application to

P 28 11 779.5 Stabilized Perchlorethylene Perchlorethylene is according to the German patent application P 28 11 779.5 with a mixture of alkylphenols, Amines and cyclohexene oxide stabilized. It has been shown that cyclohexene oxide shows insufficient stability even in some cases.

The invention relates to stabilized perchlorethylene containing 0.001 to 0.01% by weight of N-alkylmorpholine with straight or branched alkyl chains with -1 to 5 carbon atoms and optionally alkyl substituents with up to 4 carbon atoms on the ring and mixtures thereof, 0.11 to 0.01% by weight of alkylphenols with straight or branched alkyl chain with 1 to 18 carbon atoms in o- and / or p-position and their mixtures, 0.0005 to 0.002 wt.% Diisopropylamine and 0.005 up to 0.5% by weight of cyclohexene oxide, it is indicated that it is additionally contains 0.005 to 0.1% by weight of epoxypropanol.

Surprisingly, epoxypropanol can also be added in the presence the stabilizing effect of cyclohexene oxide can be obtained from impurities. It All that is needed is an addition of epoxy propanol that is a tenth or less of the weight of the added cyclohexene oxide.

Example l Addition of Epoxipropanol: Perchlorethylene was with 50 ppm N-methylmorpholine, 15 ppm diisopropylamine, 50 ppm p.-tert-butylphenol, 2500 ppm cyclohexene oxide and 200 ppm epoxypropanol stabilized. Then were in one first attempt 200 ppm and in a second attempt 400 ppm zinc chloride was added and then heated to the boil for 72 hours. After this time it was cyclohexene oxide under changed available. In the gas chromatogram, 2460 ppm cyclohexene oxide were found, Cyclopentylaldehyde was also not detectable in traces, the mixture showed none Foreign smell.

Claims (1)

Patent p a n s p r u ch Containing stabilized perchlorethylene 0.001 to 0.01% by weight of N-alkylmorpholine with straight or branched alkyl chains with 1 to 5 carbon atoms and optionally alkyl substituents with up to 4 carbon atoms on the ring and mixtures thereof1 0.001 to 0.01% by weight of alkylphenols with straight or branched alkyl chain with 1 to 18 carbon atoms in o- and / or p-position and mixtures thereof, 0.0005 to 0.002% by weight of diisopropylamine and 0.005 to 0.5% by weight Cyclohexene oxide according to patent application P 28 11 779.5 d a d u r c h g e k e n n z e i c h n e t that it additionally contains 0.005 to 0.1% by weight of epoxypropanol.