Disposition of steam cracked tar
AssigneeExxonMobil Chemical Patents Inc.
InventorsJames N. McCoy, Paul F. Keusenkothen
Life of this patent
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Abstract
In the invention, tar is upgraded by deasphalting and then hydrocracking to produce valuable products such as low sulfur diesel fuel and mogas. The invention is also directed to a system integrating a pyrolysis furnace operation with refinery operations.
Claims14
A method comprising:
- (a) a step of obtaining steam cracked tar, wherein (a) includes fractionating the effluent of a pyrolysis furnace to provide a bottoms product comprising steam cracked tar and to provide one or more products comprising light olefins selected from ethylene, propylene, and butenes, are separated in a primary fractionator, and isolating a bottoms product comprising tar from said fractionating;
- (b) at least one step of treating said steam cracked tar via solvent deasphalting to remove asphaltenes to provide a deasphalted tar;
- and
- (c) at least one step of hydrotreating said deasphalted tar to obtain a hydrotreated, deasphalted tar product;
- (d) separating a hydrocrackate from said hydrotreated, deasphalted tar product by fractionation, wherein (i) said hydrocrackate is obtained as bottoms product and (ii) said hydrocrackate is characterized as providing a viscosity and sulfur credit versus Bunker C Fuel;
- and
- (e) blending said hydrocrackate with Bunker Fuel to produce a compatible blend.
A process comprising a step of steam cracking of a feedstock to provide a first product comprising light olefins selected from ethylene, propylene, and butenes, and steam cracked tar, a step of deasphalting said steam cracked tar via solvent deasphalting to provide a deasphalted tar, a step of hydrotreating said deasphalted tar to provide a hydrotreated deasphalted tar, a step of fractionating said hydrotreated deasphalted tar to provide a hydrotreated bottoms product, and a step of blending said hydrotreated bottoms product with Bunker Fuel to produce a compatible blend;
- and
- wherein (i) the first product and the steam cracked tar are separated in a primary fractionator;
- (ii) said hydrotreated bottoms product has a viscosity and sulfur credit versus Bunker C Fuel;
- and (iii) said hydrotreating is selected from the group consisting of hydrodesulfurization, hydrodenitrogention, hydrodeoxygenation, hydrofining, and combinations thereof.
Dependencies are inferred from the claim text.