Asphalt production from solvent deasphalting bottoms

摘要

A cost-effective solution is provided for eliminating refinery process waste, including spent catalytic and non-catalytic adsorbent materials, as well as adsorbate process reject materials derived from desorption, while minimizing conventional waste handling demands. An asphalt composition includes asphalt and spent adsorbent material from a solvent deasphalting unit. The asphalt can comprise asphaltic material obtained from a solvent deasphalting unit, and spent adsorbent material in the asphalt composition was previously utilized in the solvent deasphalting unit. The asphalt composition can also include process reject materials.

主权项

1. A solvent deasphalting process comprising:
a. introducing a residual oil feedstock containing asphaltenes, a paraffinic solvent and a solid porous adsorbent material into a mixing vessel and maintaining the components in the mixing vessel for a time sufficient so that carbonaceous materials and contaminant compounds including sulfur- and nitrogen-containing polynuclear aromatic molecules are adsorbed on the adsorbent material and within the pores of the adsorbent material; b. separating a solid phase comprising asphaltenes and adsorbent material from the oil/solvent mixture; c. passing at least a portion of the asphaltene/adsorbent mixture to a filtration vessel with a solvent to desorb at least a portion of the adsorbed compounds, and separating and passing the solid asphalt phase to an asphalt pool; d. recovering solid adsorbent material having carbonaceous materials and contaminant compounds including sulfur- and nitrogen-containing polynuclear aromatic molecules deposited within its pores from the filtration vessel and passing said solid adsorbent material to the asphalt pool, wherein no more than about 50% of the original pore volume of the adsorbent material is blocked by carbonaceous materials and contaminant compounds; e. recovering the solvent stream, which includes process reject materials comprising bituminous materials and heavy polynuclear aromatic compounds, from the filtration vessel and passing said solvent stream to a fractionator to separate the process reject materials from the solvent; and f. recovering said process reject materials from the fractionator and passing the process reject materials to the asphalt pool.