Resource-saving de-asphalting of vacuum residue in supercritical conditions
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Process Description Feedstock - vacuum residue is mixed with the first part of the solvent and sent to extractor 1, in the lower zone of which the second part of the solvent and the mixture of the third part of the solvent with the circulating asphalt solution are fed. Asphalt solution is discharged from the bottom of extractor 1, divided into balance solution, which is heated in heat exchanger 3, and circulating solution, which is directed to jet pump 2. The balance asphalt solution is separated in column 4 and separator 5 into asphalt and high and medium pressure solvent vapors. Deasphalted solution is discharged from the top of extractor 1, mixed with solvent and, through heat exchangers 8, 6, 9 and 10, is fed to supercritical separator 11 by pump 7, where it is separated into liquid regenerated solvent and deasphalted phase, which is separated in column 12 and separator 13 into deasphaltizate and high and medium pressure solvent vapors. Deasphaltizate is divided into circulating and balanced. Medium pressure solvent vapors from separators 5 and 13 are mixed with circulating deasphaltizate from column 12 and cooled in heat exchanger 3. Regenerated solvent is mixed with high-pressure solvent vapors cooled in heat exchanger 9 to produce a circulating solvent, which is cooled in heat exchangers 8, 15 and returned to the process.
Process features
The formation of low-pressure solvent vapors is excluded
Low consumption of electricity and fuel
Water vapor is excluded
Furnace heating is excluded
Technical Specification
Feedstock- vacuum residue
Feedstock capacity: up to 1 million tons/year
Extractor temperature: 75-85 °C (bottom)/95-105 °C (top), pressure: 3.0-4.0 MPa
Supercritical separation temperature 155- 165°C, pressure: 4.5-4.8 MPa
Patents of the Russian Federation No. 2525983, 2526626, 2537405