SU794509A1 - Method of determining hydrocarbon content of diesel fuel - Google Patents

Description

sorption of a sample of fuel 200 mm from the upper level of silica gel; the tube is held for some time to level the interface between the adsorption zones of the fuel components. Then, the length of the adsorption zone of aromatic hydrocarbons, blue-luminescent under UV light and the adsorption zone of paraffin-naphthenic hydrocarbons, which does not luminesce and is located below the adsorption zone of aromatic hydrocarbons, is measured.

From the upper boundary of the adsorption zone of the fuel sample, the total length of its adsorption zone in the tube is counted. A parallel determination is made on the same tube after displacing the sample adsorption zone 20 mm down.

The content of aromatic hydrocarbons is determined by the formula:

Dd x iOO

%)

00

Lt -

where Lz is the length of the luminescent adsorption zone of aromatic hydrocarbons, mm;

Lt: - the length of the total area of adsorption of the fuel sample, mm.

The content of paraffin-naphthenic hydrocarbons is determined by the formula:

nH iSLlJ ,,,. j,

where Lpn is the length of the adsorption zone of paraffin naphthenic hydrocarbons, mm;

Lt is the length of the total adsorption zone of the fuel sample, mm.

The method was tested on artificial mixtures of paraffin-naphthenic and aromatic hydrocarbons isolated from DZ diesel fuel. These checks are presented in Table. one.

The verification of the method of luminescence-liquid chromatography on artificial mixtures of hydrocarbons from diesel fuel DZ is given in table. one.

Table 1

table 2How to see

from the given dains,

maximum discrepancies were ± 1.5 vol. % .. Using the method of luminescent-liquid5 bone chromatography, about 100 samples of diesel fuels produced by various refineries were investigated. Data on the hydrocarbon composition of some of the investigated diesel fuel is presented in Table. 2

10 The obtained data showed that the method can be successfully used in determining the hydrocarbon composition of diesel fuels obtained from the oils of various fields in the country.

15 Comparative data in determining the hydrocarbon composition of diesel fuels using eluent-liquid chromatography methods and this method are presented in Table. 3

20 The method has passed metrological certification. Data on the verification method are presented in Table. )four-.

From tab. 4, which shows that the convergence of the method with the coefficient of confidence

25 probability 0.95 is 2.0 vol. % with an accuracy of 0.65 about. %

ELC method

DZDL indicator Fuel grade 100100 Fuel volume, cm 1000 1000 Volume of silica gel, cm 0.05-0.15 0.05-0 Fineness of silica gel, mm Fine, Type of silica gel Processing of silica gel None Length of column, mm Diameter of column, mm Petroleum ether Solvent and others Solvent volume, see Determination of coefficient Control measurement of laziness on a refractometer Formalite reaction Additional control reaction Solvent distillation Concomitant evaluation Duration of analysis, hours 2525 3-44-5 Fuel loss, vol. % Content aromatic. 16,227,4 Hydrocarbons, about. % 13,123.2 Discrepancy between the parameters, 14.2 by definition, vol. %

Table 3

LVHH method / s 1000 37 or DZDL 0,40,4 33 0,15 0.05-0.15 cary thief of alkali and distillate with water 5050 33 isopropanol 33 length of the adsorption zone of hydrocarbons with a standard oy ruler None None 2,5 None 7,428.7 1.11.9

Claims (2)

1. GOST 6994-74. 2.Zrelov V.N., Kichkin G.I. Chromatography in the petroleum and petrochemical industries. M., Gostoptehizdat, 1963, p. 52-58 (prototype).