Commercial Qualities of Gas Condensate from the Myldzhinskoye Field
Abstract Generated abstract
This study evaluates the commercial properties of gas condensate from the Myldzhinskoye field using direct distillation with atmospheric vacuum rectification and compares the resulting fractions with relevant fuel standards. The condensate is shown to have low sulfur content and to yield substantial gasoline, jet fuel, kerosene, and diesel fractions, although some products require adjustment or additives, such as tetraethyl lead for gasoline fractions or shifted cut points for certain diesel specifications. The authors propose three fuel processing schemes that allocate the condensate into motor gasoline components, jet fuel, catalytic reforming feedstock, illuminating kerosene, diesel fuel, gas, and residue, indicating that the condensate can be processed flexibly along a fuel production line.
Full Text
COMMERCIAL PROPERTIES OF GAS CONDENSATE FROM THE MYLDZHINSKOYE FIELD
N. M. Smolyaninova, K. K. Stramkovskaya, S. I. Smolyaninov,
A. E. Shuliveistrov
(Presented by the Scientific-Methodological Seminar of the Faculty of Chemical Technology)
This communication presents the results of studies of the commercial properties of the Myldzhinskoye gas condensate.
The characteristics of commercial products from direct distillation with atmospheric-vacuum rectification are presented in Table 1.
Gasoline fractions are characterized by the absence of sulfur or by an insignificant sulfur content and by low octane numbers in the neat state—46–68. However, the susceptibility of these fractions to tetraethyl lead is high: with the addition of 3.3 g/kg to the I.B.P.—85°C fraction, its octane number rose to 93. Other fractions, with the addition of TEL in an amount of 0.82 g/kg, meet the requirements of the technical specifications for A-66 motor gasoline.
The yield of distillates used as feedstock for jet fuels is very high—40–45%. Along with the high yield, the 120–240°C fraction, by all indices, corresponds to T-2 grade jet fuel (GOST 10227-62), while the 120–280°C fraction fails to meet this fuel grade only with respect to crystallization temperature.
From the kerosene distillates it is possible to obtain illuminating kerosene which, by all indices, meets GOST 4753-49. The kerosene fraction boiling within the range 150–320°C can also be used as diesel fuel, since it has a high cetane number and, by all indices except crystallization temperature, corresponds to grade A diesel fuel according to GOST 305-62. This cut can apparently satisfy the requirements for grade Z fuel if the temperature limits of its withdrawal are somewhat shifted toward a higher initial boiling temperature, in order to raise the viscosity of the cut to the requirements of GOST 305-62 for the specified grade (from 1.96 cSt to 2.2 cSt). According to the distillation curve, the 160–320°C fraction (its yield is 28.4%) may meet these requirements.
The 200–320°C fraction and the residue boiling above 200°C, by all indices, meet the requirements of GOST 305-62 for grade L diesel fuel intended for high-speed engines. The 240–320°C fraction corresponds to grade L and S diesel fuels according to GOST 305-62. The residue boiling above 240°C can be used as grade DS diesel fuel according to GOST 4749-49. In addition, the 240–320°C fraction and the residue boiling above 240°C meet the requirements of GOST 1667-51 for diesel fuels of grades DT-1, DT-2, and DT-3.
Table 1
Characteristics of commercial products
| Selection temperature, °C | Condensate yield, % | Density, $\rho^{20}$ | Viscosity, cSt, 20°C | Viscosity, cSt, 50°C | Total sulfur content, % | Pour point, °C | Flash point in closed crucible, °C | Cloud point, °C | Onset of crystallization, °C | Iodine number, g of iodine per 100 g of fuel | Octane number | Cetane number | Hydrocarbon content, %, aromatics | Hydrocarbon content, %, naphthenic | Hydrocarbon content, %, methane | Coking tendency, % | Height of non-smoking flame, mm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 28–200 | 77,3 | 0,7328 | — | — | 0,003 | — | — | — | — | — | 46,3 | — | — | — | — | — | — |
| fuel for jet engines; 120–240 | 40,2 | 0,7575 | 1,20 | — | 0,01 | — | 30 | — | −60 | 0,21 | — | — | 7,0 | — | — | — | above 30 |
| fuel for jet engines; 120–280 | 44,9 | 0,7621 | 1,29 | — | 0,01 | — | 34 | — | −47 | 0,25 | — | — | 7,3 | — | — | — | above 30 |
| kerosene distillates; 150–280 | 29,9 | 0,7741 | — | — | 0,01 | — | 54 | −43 | — | — | below 30 | — | — | — | — | — | 29 |
| kerosene distillates; 150–320 | 32,7 | 0,7765 | — | — | 0,02 | — | 56 | −38 | — | — | — | — | — | — | — | — | 26 |
| diesel distillates; 150–320 | 32,7 | 0,7765 | 1,96 | 1,27 | 0,02 | −44 | 63 | −30 | — | 0,40 | — | above 58 | — | — | — | 0,1 | — |
| diesel distillates; 200–320 | 15,5 | 0,8045 | 3,57 | 2,00 | 0,06 | −27 | 90 | −18 | — | 0,60 | — | — | — | — | — | 0,02 | — |
| diesel distillates; 240–320 | 7,5 | 0,8208 | 5,00 | 2,50 | 0,08 | — | 90 | — | — | — | — | — | — | — | — | 0,03 | — |
| diesel distillates; above 150 | 35,7 | 0,7872 | 2,08 | 1,00 | 0,05 | −40 | 50 | −23 | — | 0,65 | — | — | — | — | — | 0,01 | — |
| diesel distillates; above 200 | 18,5 | 0,8072 | 3,80 | 2,03 | 0,06 | −26 | 76 | −8 | — | 0,63 | — | — | — | — | — | 0,03 | — |
| diesel distillates; above 240 | 10,5 | 0,8223 | 6,80 | 3,27 | 0,07 | −10 | 92 | 0 | — | 1,04 | — | 68* | — | — | — | 0,04 | — |
* Determined by the aniline point.
The work carried out makes it possible to conclude that the condensate of the Myldzhinskoye field can be processed along the fuel line according to the variants given in Table 2.
Table 2
Processing variants
| Variant | No. | Commercial products | Yields, % |
|---|---|---|---|
| I | 1 | Gas up to \(C_4\) | 4.2 |
| I | 2 | Motor-gasoline component (28–160°C) | 64.4 |
| I | 3 | Diesel fuel (160–320°C) | 28.4 |
| I | 4 | Residue (above 320°C) | 3.0 |
| II | 1 | Gas up to \(C_4\) | 4.2 |
| II | 2 | Motor-gasoline component (28–120°C) | 45.1 |
| II | 3 | Jet fuel (120–240°C) | 40.2 |
| II | 4 | Diesel fuel (residue above 240°C) | 10.5 |
| III | 1 | Gas up to \(C_4\) | 4.2 |
| III | 2 | Motor-gasoline component (28–85°C) | 21.6 |
| III | 3 | Feedstock for catalytic reforming (85–180°C) | 50.1 |
| III | 4 | Illuminating kerosene (180–320°C) | 21.1 |
| III | 5 | Residue (above 320°C) | 3.0 |
Conclusions
- The commercial properties of the gas condensate of the Myldzhinskoye field have been studied.
- Three variants for its processing have been proposed.