The introduction of furfural unit

Lube oil solvent refining is a process that uses the selectivity of a solvent to separate desirable components from non-desirable components in a lubricant feedstock. Furfural refining is the use of furfural as a solvent. Furfural is a kind of selective strong and solubility low solvent, to lube oil fraction in different hydrocarbons have different solubility, multi-ring short side chain of aromatic hydrocarbons and cycloalkanes, gums, sulphur and nitrogen compounds, etc. (non-ideal components) in furfural solubility larger, less ring long side chain of hydrocarbons (ideal components) in furfural solubility small, the use of furfural of this - nature, make lube oil raw materials, in the extraction The tower and Zei formaldehyde counter-current contact, in lower than the oil critical temperature conditions, divided into two phases of different weight, and then use the weight difference, so that non-ideal components from the bottom of the extraction tower outflow for extraction liquid, ideal components from the top of the extraction tower outflow for refining liquid, respectively, after steaming out the solvent, you can get extraction oil and refined oil.