Pyrolysis of Gas Condensate from the Luginetskoye Field
Abstract Generated abstract
This study examines pyrolysis as a route for processing the light, boiling point to 62°C fraction of gas condensate from the Luginetskoye field to obtain lower olefins. Experiments were conducted in a laboratory flow unit at 725 and 750°C over contact times of 0.2 to 1.6 seconds, without steam dilution, and the yields and gas compositions for ethylene, propane, propylene, and heavier olefin fractions were evaluated. The results indicate maximum ethylene contents of 27 to 31 wt.% and ethylene yields of 20 to 24 wt.% under selected conditions, while the recommended ethylene, propylene operating regime is 750°C with a contact time of 1.0 second. Carbon formation remained low, at 0.2 to 0.4 wt.% per pass, increasing with temperature and contact time.
Full Text
PYROLYSIS OF GAS CONDENSATE FROM THE LUGINETSKOYE FIELD
S. I. Smolyaninov, A. V. Kravtsov, V. K. Zhurba, V. A. Kuznetsova
(Presented by the scientific-methodological seminar of the KhTF)
At present, 7 gas fields have been discovered in the territory of Tomsk Oblast, and the question of using and processing this type of raw material is becoming increasingly acute. Gas condensates, together with gas, will provide significant quantities of condensate.
In this connection, the question arises of choosing rational ways to use and process this type of raw material. Gas condensates can successfully be used to obtain motor and jet fuels. A number of authors [1—4] propose processing gas condensates by pyrolysis to obtain low-molecular-weight olefins.
We carried out a study of the pyrolysis process of the fraction
Fig. 1. Dependence of ethylene concentration on contact time
Fig. 2. Dependence of ethylene yield on contact time
b.p.—62°C Luginetskoye condensate in order to find the optimal conditions for obtaining lower olefins (ethylene and propylene).
The initial condensate fraction consisted mainly of methane hydrocarbons; its yield from the condensate was 14.3%.
The experiments were carried out on a laboratory flow-type unit at temperatures of 725 and 750°C and over a wide range of contact times from 0.2 to 1.6 sec, without dilution with steam.
The experimental results showed that the highest ethylene content in the pyrolysis gas is obtained at a contact time of 1.0 to 1.6 sec and amounts to 27–31 wt. % (Fig. 1). Maximum ethylene yields of 20–24 wt. %, calculated on the feed passed through, were obtained at contact times of 1.0–1.4 sec for a temperature of 725°C and 0.3–1.6 sec for a temperature of 750°C (Fig. 2). Moreover, at 750°C the maximum shifts toward longer contact times.
The maximum yield, based on feed, of the propane–propylene fraction (Fig. 3) was obtained at a contact time close to 1.0 sec and a temperature of 750°C, despite the fact that in the composition of the pyrolysis gas, with an increase in contact time from 0.3 to 1.6 sec, the concentration of the propane–propylene fraction decreases (Fig. 4).
On the basis of the above, the following conditions may be recommended as the ethylene–propylene regime: temperature 750°C, contact time 1.0 sec.
The maximum content of the butylene–divinyl fraction (5.9%) at 750°C occurs at a contact time of 0.6 sec.
Carbon formation in all the experiments carried out varies within the range of 0.2–0.4 wt. % per pass and increases with increasing temperature and contact time.
Fig. 3. Dependence of the concentration of the propane–propylene fraction on contact time
- \(y\)-axis: Yield of propane–propylene, wt. %
- \(x\)-axis: Contact time, sec
- Curves: \(t = 750^\circ\mathrm{C}\); \(t = 725^\circ\mathrm{C}\)
Fig. 4. Dependence of the yield of the propane–propylene fraction on contact time
- \(y\)-axis: Yield of the propane–propylene fraction, wt. % of feedstock
- \(x\)-axis: Contact time, sec
- Curves: \(t = 750^\circ\mathrm{C}\); \(t = 725^\circ\mathrm{C}\)
Conclusions
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The pyrolysis process of the fraction b.p.—62°C of gas condensate from the Luginetskoye field was studied at two temperatures and various contact times.
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The dependence of the yield of ethylene and propylene on the experimental conditions was established.
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The optimal ethylene–propylene regime was selected.
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