Washing oil in the crude benzene unit
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The washing oil that absorbs crude benzene is oil-rich; after the crude benzene is distilled off, it becomes oil-poor. It is reused, and during this process a small amount of the washing oil is taken out for regeneration while the residue is discarded, in order to maintain the quality of the washing oil. At the same time, an appropriate amount of new washing oil is added to ensure stable operation of the system. If the entire crude benzene processing unit is taken as the object of study, the purchase of new washing oil is considered as the inflow of materials, while ( ) is regarded as the outflow of materials, thereby achieving material balance. If things can only come in and not go out, there will be more and more of them.
Disposal of the residue after oil washing and regeneration.
Extraction of crude benzene； Discharge of washing oil ；
Oil washing regeneration residue (heavier components); some of the lighter components in the oil washing liquid end up in crude benzene
Extraction of crude benzene； Discharge of washing oil
Extraction of crude benzene: Isn’t crude benzene derived from coal gas? Discharge of cleaning oil: Where is the cleaning oil being discharged to?
Currently, negative-pressure benzene removal is used, and the resulting sludge is discharged in large quantities; this sludge is usually sent back to the tar tank where it is used as tar for sale； Secondly, during oil washing and benzene removal, the light components that are compatible with benzene will evaporate to some extent and end up in the crude benzene, contributing to its output