Mineral oils: processes and products – Refining – Sulfur removal
Reexamination Certificate
2007-11-06
2007-11-06
Nguyen, Tam M. (Department: 1764)
Mineral oils: processes and products
Refining
Sulfur removal
C208S21600R, C208S217000, C208S218000, C208S212000, C208S189000, C203SDIG016
Reexamination Certificate
active
11271229
ABSTRACT:
A process for concurrently fractionating and hydrotreating a full range naphtha stream. The full boiling range naphtha stream is subjected to simultaneous hydrodesulfurization and splitting into a light boiling range naphtha and a heavy boiling range naphtha, which have been treated to convert mercaptans in the fractions to H2S, which is separated with and separated from the light naphtha which is further hydrodesulfurized by contacting the light boiling range naphtha with hydrogen in countercurrent flow in a fixed bed of hydrodesulfurization catalyst to remove recombinant mercaptans which are formed by the reverse reaction of H2S with olefins in the naphtha during the initial hydrodesulfurization wherein the improvement comprises fractionating said portion of light boiling range naphtha to remove a lighter fraction thereof from said countercurrent flow reactor before contact of said lighter fraction with said fixed bed catalyst, because the lighter fraction is substantially free of mercaptans and is not benefitted by further treatment.
REFERENCES:
patent: 4265735 (1981-05-01), Audeh et al.
patent: 5169516 (1992-12-01), Carr
patent: 5320742 (1994-06-01), Fletcher et al.
patent: 5510089 (1996-04-01), Jones
patent: 5597476 (1997-01-01), Hearn et al.
patent: 5659106 (1997-08-01), Frey et al.
patent: 5759386 (1998-06-01), Frey
patent: 5779883 (1998-07-01), Hearn et al.
patent: 5807477 (1998-09-01), Hearn et al.
patent: 5851383 (1998-12-01), Frey
patent: 6083378 (2000-07-01), Gildert et al.
patent: 6231752 (2001-05-01), Putman
patent: 6416658 (2002-07-01), Maraschino et al.
patent: 6444118 (2002-09-01), Podrebarac et al.
patent: 6495030 (2002-12-01), Podrebarac
patent: 0 725 126 (1996-08-01), None
Maraschino Mario J.
Podrebarac Gary G.
Vichailak Montri
Catalytic Distillation Technologies
Nguyen Tam M.
LandOfFree
HDS process using selected naphtha streams does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with HDS process using selected naphtha streams, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HDS process using selected naphtha streams will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3835959