US 7,622,034 B1Granted

Hydrocarbon conversion process

AssigneeUop LLC

InventorsVasant P. Thakkar, Douglas W. Kocher-Cowan

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Abstract

A process is provided to produce high cetane quality and low or preferably ultra low sulfur diesel and a fluid catalytic cracker (FCC) quality feedstock from a processing unit including at least a hydrotreating zone and a hydrocracking zone. In one aspect, the processing unit includes reactor severity requirements in both the hydrotreating zone and the hydrocracking zone effective to produce the FCC feed quality and the diesel sulfur quality to permit a high quality hydrocracked product to be formed at lower pressures and conversion rates without overtreating the FCC quality feedstock stream. In another aspect, a portion of the hydrotreated effluent is selected for conversion in the hydrocracking and the remaining portion of the hydrotreated effluent is directed to subsequent processing, such as fluid catalytic cracking.

Claims13

Dependent claims

A process to produce low sulfur diesel and a fluid catalytic cracker (FCC) quality feedstock, the process comprising:

(a) reacting a hydrocarbonaceous feedstock in a hydrotreating zone containing a hydrotreating catalyst at conditions effective to produce a hydrotreating zone effluent having a reduced concentration of sulfur and nitrogen;
(b) separating the hydrotreating zone effluent in a fractionating zone into at least a diesel boiling range hydrocarbon stream and the FCC quality feedstock;
(c) selecting at least a first portion and a second portion of the FCC quality feedstock and combining the first portion with the diesel boiling range hydrocarbon stream to form a hydrocracking zone feed stream;
(d) reacting the hydrocracking zone feed stream in a hydrocracking zone having at least a hydrocracking catalyst at conditions effective to produce a hydrocracking zone effluent including the low sulfur diesel having less than about 10 ppm sulfur;
(e) passing the hydrocracking zone effluent into the fractionating zone to separate the low sulfur diesel;
and
(f) directing the second portion of the FCC quality feedstock to a fluid catalytic cracking unit.

4 more elements

A process to produce a fluid catalytic cracker (FCC) quality feedstock and an ultra low sulfur diesel, the process comprising:

(a) reacting a hydrocarbonaceous feedstock in a hydrotreating zone containing a hydrotreating catalyst to produce a hydrotreating zone effluent having less than about 1000 ppm sulfur;
(b) separating the hydrotreating zone effluent in a fractionation zone into at least a diesel boiling range hydrocarbon stream and the FCC quality feedstock;
(c) combining about 25 to about 40 percent of the FCC quality feedstock and the diesel boiling range hydrocarbon stream into a hydrocracking zone feedstock;
(d) reacting the hydrocracking zone feedstock in a hydrocracking zone containing at least a hydrocracking catalyst to produce a hydrocracking zone effluent including high quality, ultra low sulfur diesel having a cetane number between about 40 and about 55 with less than about 10 ppm sulfur;
and
(e) passing the hydrocracking zone effluent into the fractionation zone to separate the ultra low sulfur diesel.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/618,586Filed 29 Dec 2006
Granted: 24 Nov 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

C10G 65/12
Plural serial stages only: including cracking steps and other hydrotreatment steps
C10G 45/02
Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds: to eliminate hetero atoms without changing the skeleton of the…
C10G 45/08
Containing nickel or cobalt metal, or compounds thereof: in combination with chromium, molybdenum, or tungsten metals, or compounds thereof
C10G 45/12
Characterised by the catalyst used: containing crystalline alumino-silicates, e.g. molecular sieves