Partial Upgrading of Bitumen: Impact of Solvent.
Solvent deasphalting (SDA) is a separation process in which residues are selectively separated by molecular type by mixing with paraffinic solvents and precipitating out of solution asphaltenes and other residue heavy components.
The two objectives of the deasphalting process are: Produce asphalt - as final product. Remove asphaltenes to prevent coke, or metal buildup on catalyst in further processing of DAO. Depending on the properties of the VDR and prevailing markets, the emphasis could be placed on one of these objectives.
The solvent deasphaltation treats the residue of the vacuum distillation through a pressurized liquid-liquid extraction, using specific properties of the solvent.
The effect of the solvent deasphalting (SDA) process of vacuum residue (VR) blending with coal tar (CT) was studied, and the experimental conditions were optimized. The results revealed that the SDA process was improved by blending with coal tar.
Foster Wheeler is developing the ASCOT (Asphalt Coking Technology) process which combines a modified solvent deasphalting (SDA) unit, using heavy solvents, with a delayed coking (DC) unit for the upgrade of heavy oils into intermediate products suitable for processing in conventional refinery units, to produce high quality distillate products.
Fresh feed (vacuum residue) is pumped into the solvent deasphalting unit and combined with a small quantity of predilution solvent to reduce its viscosity (see Figure 6-6). The combined vacuum residue and predilution solvent at the desired extraction temperature flow into the middle of rotating disk contactor (RDC) V-101. Solvent streams from HP and LP solvent receivers V-106 and V-107 are.
In this regard, solvent deasphalting (SDA) processes occupy an important place in the practice of oil refining, ensuring the removal of asphaltenes or resin-asphaltene complexes and associated metals and heteroatoms, as well as reducing Conradson carbon residue (CCR), which greatly facilitates subsequent resid processing by catalytic processes.
Solvent deasphalting is essentially a solvent-based extraction process and the required solvent is usually available within the refinery. The process separates oil from carbon-rich components, resins, and asphaltenes and makes it available to convert it to lube stock or as feedstock for other secondary processing facilities.
Description of Processes for Upgrading of Heavy Petroleum. designed respectively to process heavier feedstocks, i.e. blends of various crude oils with elevated amount of heavy petroleum. This is of course due to the reduction of light crude oil and the increase of heavy or extra heavy crude oils production. These new feeds are characterized by high amounts of impurities (sulfur, metals.
The solvent extraction process separates aromatics, naphthenes, and impurities from the product stream by dissolving or precipitation. The feedstock is first dried and then treated using a continuous countercurrent solvent treatment operation. In one type of process, the feedstock is washed with a liquid in which the substances to be removed are more soluble than in the desired resultant.
Solvent deasphalting (SDA), a nondestructive liquid-liquid extraction process, is preferred to achieve this goal, whereby the last of the molecules that can be refined to valuable products are extracted from the vacuum residue. SDA is a molecular-weight-based separation process member of the family of carbon rejection technologies, which has been used for more than 50 years to separate heavy.
A mathematical description of mass exchange in the deasphalter (extractor) and a method for calculating the optimum deasphalting process parameters with injection feed of feedstock and solvent are.
This invention involves heat integration of a solvent deasphalting process with a gasification process and an improved process for separating a resin phase from a solvent solution comprising a solvent, deasphalted oil (DAO) and resin. This improved process comprises heating the solvent solution so as to precipitate the resin from the solvent solution, and then separating the resin and some.
Residual upgrading includes processes where asphalt components are separated from gas oil components by the use of a solvent. It also includes processes where the asphalt value of the residuum is upgraded (e.g., by oxidation) prior to sale. Off-spec product and fines, as well as process sludges, are study residuals from this category. 3.8.1 Process Descriptions A total of 47 refineries.
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