Study on Solvent Deasphalting Process for Upgrading of Hydrocracking Unconverted Oil

Abstract

Ebullating bed hydrocracking (EBH) and solvent deasphalting (SDA) process are effective pretreatment upgrading technologies for vacuum residuum (VR). In this work, the SDA performance of EBH unconverted oil (UCO) was investigated and the optimum process conditions were found to obtain the right balance between the maximum yield and the best properties of deasphalted oil (DAO). The test results showed that the change in operating conditions had a more significant impact on mass balance than on product quality in most cases. Compared with pressure and solvent-to-feed ratio, temperature had a more significant effect on mass balance. The yield of DAO could be significantly increased by decreasing the extraction temperature in the subcritical temperature range, while the properties of DAO did not deteriorate. Under the optimal operating conditions (temperature, 130 °C; pressure, 4 MPa; S/F ratio, 4.5), the yield of DAO was 68.89 wt % and the properties of DAO had been significantly improved compared with UCO. Simultaneously, deoiled asphalt (DOA) had good high-temperature performance and could be employed as a widely used asphalt-blending component. The combined process of EBH and SDA, an integrated process of refining and chemical, is an effective upgrading technology for high-sulfur and high-carbon-residue vacuum residuum.

Influence of Nanosilica on Solvent Deasphalting for Upgrading Iraqi Heavy Crude Oil

“…Deasphalted oil (DAO) is the heavy oil fraction that remains after the separation of asphaltenes has been completed 8 . DAO quality is affected by several SDA process parameters, including the type of solvent used, the solvent to oil ratio, the time allowed to precipitate, and the temperature and pressure used 9 . Solvent de-asphalting (SDA) is regarded as a suitable solution to the issue of excessive energy usage.…”

Microwave-Assisted Solvent Deasphalting of Heavy Fuel Oil: Process Parameters Optimization With RSM and ANN

“…The common solvents used in SDA are propane, isobutane, pentane, n-butane, hexane, and heptane [10,11]. Boffelli et al [12] investigated the efficiency of n-heptane for deasphalting heavy crude oil using a 5:1 solvent to oil ratio (v/v) at 60 °C.…”