What raw materials are used to refine white oil?
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Mineral oil is a transparent petroleum product, but yellow-colored mineral oil is available on the market now – is this really mineral oil? What is used to refine it? Some use lubricating oil as a raw material, while others use diesel. What on earth is going on here?
White oil is produced by using the oils mentioned above as raw materials, undergoing deep hydrogenation to reduce impurities and color to specified levels, after which its grade is determined based on its boiling range.
What was said above is correct; white oil is now widely used in solvent oils, such as pour point depressants, stamping oils, and rubber filling oils. It is obtained through hydrogenation refining, with an aromatic content of less than 0.5%, a flash point of 70 degrees, and a boiling range between 180-310 degrees. The raw materials for its production include base oils, as well as heavy distillate oils.
Hydrocracked tail oil is further hydrogenated to reduce its pour point, after which the white oil component is separated out.
In the past, acid-base refining was used to refine second-tier oils into white oil; nowadays, hydrogenation processes are employed instead
White oil is white mineral oil, and it can be derived from various sources. The quality requirements for white oil vary depending on its grade; for example, the standards for cosmetic-grade and food-grade white oil are different, with key requirements including the aromatic content and color. Jet fuel, diesel, and residue from hydrocracking can all be used as raw materials for white oil; oils from the second and third stages of processing can also serve as raw materials. The difference lies in the viscosity, which determines the grade of the white oil. Jet fuel is roughly equivalent to 3# white oil, while hydrocracked diesel corresponds to 5# white oil. Residue has a viscosity around 15#. Depending on the conditions of each factory, further classifications are possible; there is no strict boundary, and grading is mainly based on viscosity.
Industrial white oil can be obtained by refining raw material paraffin oil through pickling. The production process for white oil typically takes place at temperatures between 350 and 500 degrees, and it is classified based on its viscosity measured at 40 degrees Celsius; common types include 3# white oil, 7# white oil, 15# white oil, 26# white oil, etc.
It is the old three-step process for refining raw clay, but it causes significant pollution; new refineries have already phased it out.
White oil is generally refined from hydrocracking tail oil; several companies in Shandong have launched projects in this area this year, including Jinan Refinery, Qilu Petrochemical, and Binzhou, among others.
The old three-step method was used for the refining of lubricants; nowadays, furfural refining has taken its place. Is mineral oil actually a type of lubricant? ? ?