Solvent deasphalting simulation dating, other languages:
View at Google Scholar C.
View at Scopus G. The critical temperature of the solvent limits the maximum extraction temperature, since at the critical temperature, no portion of the feedstock would be soluble in the solvent and no separation would occur.
Fuels solvent deasphalting – Termwiki, millions of terms defined by people like you
Top 10 facts about the world Deasphalting is a chemical process that separates asphalt and other compounds from petroleum products. Combined design experience in optimising SDA heat-exchange systems allows the SDA user to select a multitude of heat-exchange options, depending on the project-specific objectives and opportunities.
The fit for a particular location is dependent on finding a use for the SDA pitch, and various options are discussed. One of the main characteristics of HO and EHO is the high concentration of high molecular weight asphaltenes that are complex and highly polar compounds with large amounts of heteroatoms containing O, N, and S, as well as metals such as Ni, Fe, and V [ 12 — 15 ].
For a dosage of 2. El Reto para Colombia, This work evaluated the effect of the nanoparticles of SiO2 in the separation efficiency based on deasphalted oil DAO fraction quality compared to the conventional process of deasphalting SDA. The primary product streams are the asphalt asphaltenes, hard and soft resins and the deasphalted oil DAO.
The following figure illustrates the deasphalting process flow diagram.
Regarding Si-based materials, Ikematsu et al. This result is consistent with the reductions in the asphaltene and sulfur contents [ ]. The asphaltene content fell from 4.
Each barrel of oil can yield a variety of useful products which can be sold after separation. This situation can be explained because increasing the SOR leads to reducing the asphaltene solvent deasphalting simulation dating causing them to precipitate [ 81— ].
Low content of coke and metals in the resulting deasphalted oil allows, at its mixing with vacuum gas oil, providing catalytic cracking and hydrocracking processes with feedstock of high quality. Both single-stage co-current extraction, where the bulk of the solvent is mixed with the feed prior to the extractor, and multi-stage counter-current extraction, where the bulk of the solvent enters the bottom of the extractor separate from the feed, have been used in the industry.
This increase of pitch can be explained by the adsorption phenomena between the silica nanoparticles and asphaltenes that has been widely studied and is determined by the affinity between adsorbent SiO2 nanoparticles and adsorbate asphaltenesthe asphaltene self-association over the surface of the nanoparticles, and their maximum adsorption capacity [ ].
Conflicts of Interest The authors declare that there are no conflicts of interest regarding the publication of this paper.
Two different approaches for RDC modelling when simulating a solvent deasphalting plant
As the asphaltene content of the DAO decreased, the sulfur content decreased, showing the same trend as the asphaltene content as SOR increased. It is worth mentioning that the silica nanoparticles selectivity to asphaltenes due to the presence of acid centers such as hydroxyl silanol Si-OH on their surface [ — ] and their interaction with the polar groups of asphaltenes are expected.
This situation leads to the fact that as SiO2 nanoparticles dosage increases, more asphaltenes are adsorbed, and DAO yield decreases while pitch yield increases.
In this way, SiO2 nanoparticles added to the deasphalting process adsorb asphaltenes on their surface and enhance their precipitation and separation from the crude oil matrix.
Feedstock Normal feedstock is vacuum residue. Other nonthermal techniques for viscosity reduction have been used in reservoirs including injection of diluents naphtha and light crude oils [ 62 — 64 ] and CO2 injection in enhanced oil recovery EOR processes [ 65 — 67 ], among others.
Huc, Heavy Crude Oils: This type of behavior was also noticed in sulfur content that was reduced from 2. The insoluble pitch will precipitate out of the mixed solution.
Solvent deasphalting of vacuum residue in a bench-scale unit
An increase in the extraction temperature reduces the solubility of the heavier feedstock components. Regarding the DAO quality, the e-SDA process was demonstrated to be a more suitable alternative regarding the asphaltene and sulfur contents, API gravity, and rheological properties.
Deasphalting, like many of the refinery processes, can be considered a carbon rejection process since the asphaltenes that are removed have a relativley low H: Also, these techniques for the reduction of HO and EHO viscosities require continuous injections into the reservoir making this an expensive process due to the use of large volumes of diluents.
Technology overview SDA, whether for the production of lubricating oil or cracking stocks, uses a light hydrocarbon solvent specifically tailored to ensure the most economical deasphalting design.
This situation can be explained by the same situation abovementioned; increasing the total surface area for asphaltene adsorptions leads to their precipitation [,— ] and lowers the quantity of them present in the DAO.
It is known that resins are adsorbed simultaneously with asphaltenes on the nanoparticles [ ] implying that a higher amount of the resins could remain in the pitch fraction. Inappropriate solvents may fail to lift the asphalt and other impurities, which would make the resulting oil less usable.
View at Google Scholar P. The e-SDA process also exhibited improvements regarding the DAO quality as the molecular weight of solvent was reduced. As can be noticed, increasing nanoparticles dosage decreases DAO yield and increases pitch yield.
As shown in Figure 4 athe crude oil had the expected shear-thinning behavior frequently known as pseudo-plastic behavior [ ].
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