Deasphalting
A deasphalting is a process plant of an oil refinery in which vacuum residue in a paraffinic fraction (deasphalted oil, germ .: deasphalted oil, DAO) and a (highly) aromatic moiety (which asphaltenes , engl .: asphaltenes) is split.
Deasphalting plants are usually so-called solvent deasphalters (SDA). Propane , butane or even n- pentane and n- hexane can be used as solvents . An SDA separates the asphaltenes from the vacuum residue, as the light hydrocarbons dissolve (extract) the aliphatic components, but not the asphaltenes. The DAO is used in the production of lubricating oil, for the production of micro wax and as a starting material for an FCC or HC system. The asphaltenes are fed to a flexicoker , gasification or direct incineration.
DAO of propane deasphalting (PDA) shows the highest quality (low metal content), but one (PDA) leads to a low yield. n-Pentane doubles or triples the yield, but the DAO is increasingly contaminated with metals and asphaltenes and thus reduces the service life of the FCC or HCU catalyst. If butane is used as a solvent, it is called butane deasphalting (BDA).
Individual evidence
- ↑ John J. McKetta: Petroleum Processing Handbook . CRC Press, 1992, ISBN 9780824786816 , p 536. .
Web links
- Study of selected petroleum refining residuals by US EPA (PDF; 304 kB)
- Lubricants and Lubrication doi : 10.1002 / 9783527645565
- Solvent de-asphalting (PDF; 557 kB)
- Solvent de-asphalting of vacuum residuum (PDF; 634 kB)
- Asphalt used for gasification (PDF; 579 kB)