INTEGRATED ENHANCED SOLVENT DEASPHALTING AND COKING PROCESS TO PRODUCE PETROLEUM GREEN COKE

摘要

An integrated process is provided for producing deasphalted oil, high quality petroleum green coke and liquid coker products. An enhanced solvent deasphalting process is used to treat the feedstock to reduce the level of asphaltenes, N, S and metal contaminants and produce a deasphalted oil with reduced contaminants. A coking process is integrated to produce liquid and gas coking unit products, and petroleum green coke.

主权项

1. An integrated process that operates within the battery limits of a refinery for conversion of a heavy hydrocarbon feedstock containing asphaltenes, sulfur-containing and nitrogen-containing polynuclear aromatic molecules comprising:
a. mixing the heavy hydrocarbon feedstock, paraffinic solvent and an effective quantity of solid adsorbent material
at a temperature and pressure that are below the critical pressure and temperature of the solvent to promote solvent-flocculation of solid asphaltenesandfor a time sufficient to adsorb the sulfur-containing and nitrogen-containing polynuclear aromatic molecules on the solid adsorbent material; b. passing the heavy hydrocarbon feedstock, paraffinic solvent and solid adsorbent material to a first separation vessel; c. separating a solid phase comprising asphaltenes and solid adsorbent material from a liquid phase comprising deasphalted oil and paraffinic solvent; d. passing the solid phase to a filtration vessel with an aromatic and/or polar solvent to desorb the adsorbed contaminants and to recover regenerated solid adsorbent material; e. passing the liquid phase to a second separation vessel to separate deasphalted oil and paraffinic solvent, and optionally recycling at least a portion of the separated paraffinic solvent to step (a); f. passing deasphalted oil from the second separation vessel to a coking unit; g. thermally cracking the deasphalted oil in a coking unit to produce liquid and gas coking products; and h. recovering petroleum green coke from the coking unit.