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US 10,562,829 B1Granted
Highly selective olefin removal with unsulfided hydrotreating catalysts
AssigneePhillips 66 Company
InventorsTushar Choudhary, Tu N. Pham, Sundararajan Uppili
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Abstract
A process is disclosed for polishing a relatively highly pure stream of aromatic material bound for use as a petrochemical feedstock wherein the stream includes olefins and especially concerning, diolefins. The process comprises hydrotreating the highly pure aromatic stream with an unsulfided cobalt molybdenum catalyst that has low saturating activity for the aromatic but is active for saturating olefins and diolefins.
Claims6
A process for producing a high purity aromatic product such as benzene, toluene, xylene where concerns arise for olefin and diolefin content, where the process comprises:
- forming an aromatic stream comprising at least 99% by weight the aromatic product desired where the stream includes measurable diolefin content;
- delivering the stream to a hydrotreater having a catalyst comprising cobalt and molybdenum and has not been treated with a sulfiding agent prior to this step of delivering the stream to the hydrotreater, wherein the temperature of the stream is between 400° F. and 600° F.;
- and
- converting at least 90 percent of the diolefins to alkanes in the hydrotreater while, at the same time, converting less than 10 ppm aromatic to cyclohexene such that the bromine index of the aromatic stream is reduced.
1 more element
Dependencies are inferred from the claim text.