How is the sulfur content distributed during the refining of high-sulfur crude oil?
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Will processing high-sulfur crude oil on existing units only affect the atmospheric and vacuum distillation units? Was the sulfur content also distributed during the refining process? What is the general pattern of this distribution? Could it have an impact on the subsequent steps such as reforming, coking, gas separation, and hydrogenation? Please give me some advice
High-temperature sulfur corrosion occurs in both atmospheric and vacuum distillation units as well as in units for secondary processing. It depends largely on the sulfur content in the feed materials; in atmospheric and vacuum distillation units, most thiols and thioethers decompose, while compounds such as thiophene, which are more difficult to decompose, do so only under hydrogenation or catalytic conditions. Therefore, this phenomenon is inevitable. I’m not quite sure about how the allocation is determined, but it generally depends on the temperature range for product separation and the source of the raw materials.
Equipment Category, Equipment Corrosion Condition, Typical Cases of Corrosion and Brief Analysis: In heating furnaces, corrosion mainly occurs in the cold feed tubes and softening water pipes in the convection section. In February 2000, the softening water pipes and cold feed pipes in the convection sections of Furnace 1, Furnace 2, and Furnace 3 suffered corrosion-induced perforations; a major repair was carried out in May of the same year, during which the convection sections of all three furnaces were replaced entirely. The main reason is the high sulfur content in gas and fuel oil, which raises the flue gas dew point; as a result, the pipes thin out due to corrosion caused by this dew point. Corrosion in towers mainly occurs in the carbon steel internal components of atmospheric and vacuum towers; the form of corrosion is uniform thinning in the high-temperature zone (>300°C), while in the low-temperature zone…
A small portion of the sulfur in crude oil is separated out during atmospheric and vacuum distillation (at the top of the tower), while the sulfur-containing substances (high-temperature sulfur) present in the bottom of the tower and on the vacuum side streams proceed to the next processing step——catalysis.
To assess crude oil, it is necessary to consider how sulfur content changes with cutting temperature.
Processing high-sulfur crude oil affects units such as atmospheric and vacuum distillation units, catalytic cracking units, residue hydrogenation units, hydrocracking units, reforming units, gasoline hydrogenation units, and diesel hydrogenation units. In the secondary refining unit, the sulfur content distribution of the feedstock shows that the heavier the component, the higher its sulfur content.
Well, what was said upstairs is correct; generally, it follows this pattern