Natural gas is a primary energy source that contains a number of light paraffins. It also contains several undesirable components, such as water, ammonia, hydrogen sulphide, etc. In our study, a selective hydrogen sulphide removal process was achieved by alkali chemisorption in a custom-designed jet reactor. Several model gas compositions (CO2-H2S-N2) were evaluated to find parameters that enable H2S absorption instead of CO2. The negative effect of the presence of CO2 in the raw gas on the efficiency of H2S removal was observed. The beneficial effect of the low residence time (less than 1 s) on the efficiency of H2S removal was recognized. Optimal operational parameters were defined to reach at least a 50% efficiency of H2S removal and minimal alkali consumption.
ABSTRACT. Significant part of the energy need of the world is covered by utilization of natural gas. Due to the hydrogen sulphide content of raw gas the natural gas industry has to tackle some serious problems, for example corrosion-, environmental-, economic-and safety engineering problems. Our aim is to develop the selective hydrogen sulfide absorption by using alkali solutions. Experiments were performed in a specially designed atomizing reactor by using potassium-and sodium hydroxide absorbents. During the tests the following parameters have changed: contact time, pressure, volumetric flow rate of gas and liquid, concentration and material quality of absorbents. Three different model gas mixtures were used for measurements; they consist of nitrogen, carbon dioxide and hydrogen sulfide.
Carbon dioxide is the primary greenhouse gas emitted through human activities. There are natural bioprocesses where this molecule is converted into biomass. With cultivation of microalgae we can feed back the carbon content of CO 2 into biological systems and we can get numbers of valuable organic compounds, among others biofuel, to reach ecological and economical benefits. However we should take care of recycling byproducts as it possible.
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