DE2603918C3 - Color solutions for petroleum products - Google Patents

Description

in the

R Ci- to C ₄ -AllCyI or cyclohexyl and
X hydrogen or methyl

mean. Cyclohexanone and optionally aromatic Hydrocarbons.

2. Dye solutions according to claim 1 containing 5 to 30% dye and 95 to 70% Solvent, the solvent consisting of 20 to 100% cyclohexanone and 80 to 0% aromatic Hydrocarbons.

3. Dye solutions according to claim 1 containing 10 to 20% dye, 50 to 100% cyclohexanone and optionally aromatic hydrocarbons as the remainder.

The invention relates to the use of solutions which eirwm dye of the formula I.

NHR

Can be stored at any temperature and can be mixed with the products to be colored in any ratio are. They are thin and therefore easy to dose even at low temperatures. The solutions can can also be used in mixtures with furfural to identify heating oil.

The very high dissolving power of cyclohexanone compared to other solvents is surprising for the dyes of the formula I and the stability of the solutions.

In the following examples, parts and percentages relate to unless otherwise stated on weight.

Example I.

15 parts of the dye of p-amino-uzobenzol -Ί- Äthylnaphthylamin (Solvent Red 19) were dissolved at 20 ⁰ C in 85 parts of cyclohexanone with stirring. The solution obtained after about 30 minutes with the density (20 ° C) = 0.980 remains unchanged even after standing at -20 ° C for more than 4 weeks and without crystal precipitation. The viscosity at −20 ° C. measured in an Ubbelohde viscometer is 14 mm ² / s (DIN5I 562).
In contrast, a solution in a commercially available aromatic mixture, boiling range 187 to 213 ° C, aromatic content 99.5%, with a corresponding dye concentration, is largely crystallized after a few days at 0 ° C.

", Example 2

20 parts of the dye mentioned in Example 1 are in 80 parts of a mixture of 40 parts cyclohexanone and 40 parts aromatic mixture (main component 20% 2-methylnaphthalene, 15% 1-methylnaphthalene and 10% diphenyl) with a boiling range of above 150 ⁰ C within a Dissolved at 90 ° C. for an hour. The cooled solution remains unchanged at -20 ° C.

in the

R C1 to C4 alkyl or cyclohexyl and
X hydrogen or methyl

mean. Cyclohexanone and optionally aromatic Contains hydrocarbons for coloring petroleum products. The solutions contain approximately 5 to 30% dye and 5 to 70% solvent, with the solvent being approximately 20 to 100% cyclohexanone and 80 to 0% aromatic hydrocarbons.

Particularly suitable aromatic hydrocarbons are alkylbenzenes and alkylnaphthdlins Ci to C4 alkyl groups. In detail are for example Toluene, xylene, ethylbenzene. Isopropylbenzenes, mesitylene or methylnaphthalene and isopropylnaphthalenes and especially mixtures of these aromatics.

The solutions preferably contain 10 to 20% dye, 50 to 100% cyclohexanone and optionally the remainder are the aromatic hydrocarbons.

Preferred dyes are the compounds with X = H and R = C ₂ H, CH ₇ and cyclohexyl.

The dye solutions are very suitable for coloring mineral oil products, e.g. B. Carburettor fuels or light heating oil, because they can also be used at low temperatures

Example 3

25 parts of a dye mixture consisting of 60% Solvent Red 19 and 40% of the dye p-Aminoazobenzot - · 2-isopropylnaphthylamine at 90 ° C in 75 parts of a mixture of 65% cyclohexanone and 35% aromatic mixture according to the example 2 solved. The dye solution remains fluid even at temperatures below freezing point, easy to pump and without crystal formation.

Example 4

15 parts of the dye from o-amino-azotoluene - »2-cyclohexylnaphthylamine are at 60 ° C in 85 parts of a mixture of 80% cyclohexanone and 20% of an aromatic mixture with a boiling range from 150 to 210 ° C (containing toluene, o.m.p-xylene, mesitylene, Ethylbenzene and cumene in approximately equal parts by volume) dissolved hot. The dye solution is very stable at low temperatures and low viscosity.

Example 5

100 parts of the dye solution obtained according to Example 1, 30 parts of furfural and 170 parts of that in Example 4 said aromatic mixture are mixed with stirring. This solution is also at -20 "C without Resistant to change and is suitable for labeling light heating oil. Since / u will be 100 g of the Labeling solution used per 1000 kg of EL heating oil.

Claims (1)

Claims-. I. Dye solutions for coloring petroleum products containing a dye of the formula I. NHR N = N N = N- (D