Issues with Sinopec’s standards for external procurement
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Dear experts, I have a question. The current standard for domestically sourced National 5 gasoline requires the olefin content to be between 8 and 20. Why must the olefin level be above 8? Also, at which stage of the refining process does olefin formation occur – at atmospheric pressure, under reduced pressure, or during catalytic reforming? . . ? Thank you!
Olefins are present in catalytic gasoline in significant amounts, around 40% or so; currently, many oil formulators lack olefins in their products
Olefins mainly come from catalytic gasoline; controlling the lower limit is primarily aimed at regulating blended gasoline, as blenders lack olefin components. Such control essentially ensures that the fuel is derived from blending processes in refineries. Personal opinion.
The lower limit for olefins is set to ensure an adequate content of catalytic gasoline and to minimize the proportion of blending components, while the upper limit is set to guarantee the quality of gasoline purification
Controlling the olefin content requires the use of catalytic gasoline, which limits the options available to blenders
In addition to the high olefin content in catalytic gasoline, coal-derived C5 is also a material that refiners choose to use in order to increase the olefin content
The olefin content in catalytic gasoline is higher, while it’s lower in reformed gasoline and alkylated gasoline, right?