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Oil can contain varying levels of sulfur, depending on its source and type. Crude oil is classified as either sweet, with low sulfur content (typically less than 0.5%), or sour, with higher sulfur content (above 0.5%). The presence of sulfur in oil can affect its refining process and the environmental impact of its combustion. Generally, lower sulfur levels are preferred for cleaner burning fuels.

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2w ago

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both contain high levels of monounsaturated fatty acids


What is cleaner to burn than oil because it does not contain sulphur?

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All fossil fuels contain sulphur, at least to some extent. Oil that has a high level of sulphur is called 'sour' crude, as opposed to 'sweet' crude which has a low sulphur level. Natural gas can also be 'sweet' or 'sour'. Sulphur in natural gas is usually present as the poisonous gas hydrogen sulphide, and it is usually removed from natural gas as it emerges from the ground. In remote regions like northern Canada or Kazakhstan its storage can be a problem. On the other hand, oil is processed at refineries, often a long way from the source of the oil, and the sulphur is used in various industrial processes. High sulphur concentrations are also found in oil or tar sands such as are found in northern Canada and Venezuela. Coal also contains sulphur, but being a solid it is difficult to extract using conventional technologies. High-sulphur coal used to produce a lot of sulphur dioxide when it was burned, which formed sulphuric acid in the air, leading to acid rain, but nowadays the waste gases are 'scrubbed' of sulphur using a limestone wash, and the mineral gypsum is formed, which is used in plasterboard and other building materials.


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