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US 6,582,590 B1Granted
Multistage hydroprocessing using bulk multimetallic catalyst
AssigneeExxonMobil Research and Engineering Company
InventorsKenneth Lloyd Riley, Darryl Patrick Klein, Zhiguo Hou, Stuart Leon Soled, Michael Charles Kerby, Gary Brice McVicker, Edward Stanley Ellis, Michele Sue Touvelle, Sabato Miseo
Life of this patent
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Abstract
Sulfur content of distillate feedstock, which is greater than 3,000 wppm, is reduced using multi-stage hydrodesulfurization by reacting the feestream in stages with reaction zone(s) containing bulk multimetallic catalyst comprised of Group VIII non-noble metal(s) and at least two group VIB metals. The ratio of Group VIB to Group VIII non-noble metals is 10:1 to 1:10.
Claims26
A multistage hydroprocessing process comprising:
- a) reacting a feedstream in a first hydroprocessing stage in the presence of a hydrogen-containing treat gas, the first stage containing one or more reaction zones, each reaction zone operated at first stage hydroprocessing conditions and in the presence of a first hydroprocessing catalyst, thereby resulting in a first liquid product stream;
- b) passing the first liquid product stream to a first separation zone where a first vapor phase product stream and a first liquid phase product stream are produced;
- c) reacting the first liquid phase product stream of b) above in a second hydrodesprocessing stage in the presence of a hydrogen-containing treat gas, the second hydroprocessing stage containing one or more second stage reaction zones operated at second stage hydroprocessing conditions wherein each reaction zone contains a second hydroprocessing catalyst, thereby resulting in a second liquid product stream having less than about 1,000 wppm sulfur;
- d) passing the second liquid product stream of step c) to a second separation zone wherein a second vapor phase stream and a second liquid phase stream are produced;
- e) reacting the second liquid phase stream from d) in a third reaction stage in the presence of a hydrogen-containing treat gas, the third hydroprocessing stage containing one or more reaction zones operated at third stage hydroprocessing conditions in the presence of a third hydrotreating catalyst, in order to form a third liquid product stream;
- f) passing the third liquid product stream to a third separation zone wherein a third vapor phase stream and a third liquid phase stream are produced;
- and
- g) collecting both the third vapor phase stream and the third liquid phase stream;
- wherein at least one of the reaction zones of at least one of the hydroprocessing stages contains a bulk multimetallic catalyst comprised of at least one Group VIII non-noble metal and at least two Group VIB metals and wherein the ratio of Group VIB metal to Group VIII non-noble metal is from about 10:1 to about 1:10.
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A two stage hydroprocessing process comprising:
- a) reacting a feedstream in a first hydroprocessing stage in the presence of a hydrogen-containing treat gas, said first hydrotreating stage containing one or more reaction zones, each first stage reaction zone operated at first stage hydroprocessing conditions and in the presence of at least one first stage hydroprocessing catalyst, thereby resulting in a liquid product stream having a sulfur content less than about 3,000 wppm;
- b) passing the liquid product stream of the first hydroprocessing stage to a first separation zone where a first vapor phase product stream and a first liquid phase product stream are produced;
- c) reacting the first liquid phase product stream of b) in a second hydroprocessing stage in the presence of a hydrogen-containing treat gas, the second hydroprocessing stage containing one or more second stage reaction zones operated at second stage hydroprocessing conditions wherein each second stage reaction zone contains at least one second stage hydroprocessing catalyst;
- d) passing the second liquid product stream of step c) to a second separation zone wherein a second vapor phase stream and a second liquid phase stream are produced;
- e) collecting both the second vapor phase stream and the second liquid phase stream;
- (i) wherein at least one of the first stage and second stage hydroprocessing catalyst comprises a bulk multimetallic catalyst comprised of at least one Group VIII non-noble metal and at least two Group VIB metals and wherein the ratio of Group VIB metals to Group VIII non-noble metal is from about 10:1 to about 1:10;
- (ii) wherein the second stage hydroprocessing catalyst in at least one second stage reaction zone is an aromatics saturation catalyst;
- and
- (iii) wherein the second stage hydroprocessing conditions in the second stage reaction zone containing the aromatics saturation catalyst hydrodearomatization conditions include a temperature ranging from about 40° C. to about 400° C., a pressure ranging from about 100 psig to about 3,000 psig, and a liquid hourly space velocity ranging from about 0.3 V/V/Hr to about 2.0 V/V/Hr.
6 more elements
Dependencies are inferred from the claim text.