IMPROVEMENT OF THE LIQUID CARBON GAS DESULFURIZATION TECHNOLOGY
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Keywords:
sulfur purification of liquefied hydrocarbon gas, hydrogen sulfide, carbonyl sulphide, remote static mixer, carbon dioxide, sodium phosphate, corrosion rate, monoethanolamine installationAbstract
The conditions of liquefaction of liquefied hydrocarbon gas (LPG) under the operating conditions of the JSC Ukrgazvydobuvannya plant are considered. Studies were conducted to develop recommendations for the purification of liquefied gas from mercaptans and hydrogen sulfide when using alkaline flushing (NaOH solution). It is shown that the composition of the liquefied gas is not constant and sometimes it contains carbonyl sulfide СОС, there is a constant presence of СС2. In addition, the gas has a significant presence of CO2 and H2S. The amount of CO2 reaches 3.4-3.6 g / kg. Mercaptans in the liquefied gas are in the amount of 0.60 - 0,70% of the mass. The presence of diethyl sulfoxide and thiocyclans in the liquefied gas has been proved. Washing with 10 -20% alkaline (NaOH) leads to a significant decrease in the amount of sulfur-containing compounds in the liquefied gas. It is recommended to intensify the mixing of alkali and liquefied gas with the help of a developed static-type portable mixer. It is recommended to consider the feasibility of adding sodium phosphate to a solution of alkali in the amount of 1 g / l, which reduces the corrosion rate of equipment by 2-3 times. It is recommended to design a small monoethanolamine installation to reduce the content of carbon dioxide in the liquefied gas and the reliable operation of the flushing unit and to reduce the amount of alkali loss. For efficient drying of the liquefied gas, as well as filtration from iron sulfide, the use of fluoroplastic filters is shown.
References
Dzioba, OG & Beetle, OG. (2009) Analysis of potential resource base for diversification of sources and ways of natural gas supply to Ukraine. Scientific Bulletin of the Ivano-Frankivsk National Technical University of Oil and Gas, 2 (20), 12-23
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Jędrychowska, S. (2013) Badanie wpływu dodatku różnych związków siarki na działanie korodujące na miedź w paliwie LPG (Study of the effects of the addition of various sulphur compounds on the corrosion of copper in LPG fuel), 69(9).
GOST 22985-90 Group B19 Intergovernmental Standard Method for the determination of hydrogen sulfide and mercaptan sulfur
DSTU 4047-2001 Hydrocarbon liquefied fuel gases for municipal consumption. Specifications
Zaikin, VI, Varlamov, AV, Mikaya, AI, Prostakov, NS (2001) Fundamentals of mass spectroscopy of organic compounds. M .: IAIC "Science", 286.
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