Two stage hydroprocessing with divided wall column fractionator
First Claim
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1. A method for producing low sulfur distillate products, comprising:
- hydrotreating a feedstock under first effective hydrotreating conditions to produce a hydrotreated feedstock that comprises a diesel product fraction having a sulfur content of about 15 wppm to about 50 wppm;
fractionating the hydrotreated feedstock in a first volume of a divided wall column fractionator to produce at least a first diesel product fraction, a first bottoms fraction, and a first common fraction that is passed to an upper undivided volume of the fractionator;
hydroprocessing a portion of the first bottoms fraction under effective hydroprocessing conditions; and
fractionating the hydroprocessed first bottoms fraction in a second volume of the divided wall column fractionator to produce at least a second diesel product fraction with at least one improved property relative to the first diesel product fraction, a third product fraction with at least one improved property relative to the first bottoms fraction, and a second common fraction that is passed to the upper undivided volume of the fractionator,in which the second diesel fraction and the third fraction are not recycled to the hydroprocessing.
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Abstract
A divided wall column allows for fractionation of multiple streams while maintaining separate product qualities. Effluents from multiple stages of a reaction system can be processed in a single divided wall column. The divided wall column can produce multiple cuts from each separated area, as well as at least one output from a common area.
21 Citations
19 Claims
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1. A method for producing low sulfur distillate products, comprising:
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hydrotreating a feedstock under first effective hydrotreating conditions to produce a hydrotreated feedstock that comprises a diesel product fraction having a sulfur content of about 15 wppm to about 50 wppm; fractionating the hydrotreated feedstock in a first volume of a divided wall column fractionator to produce at least a first diesel product fraction, a first bottoms fraction, and a first common fraction that is passed to an upper undivided volume of the fractionator; hydroprocessing a portion of the first bottoms fraction under effective hydroprocessing conditions; and fractionating the hydroprocessed first bottoms fraction in a second volume of the divided wall column fractionator to produce at least a second diesel product fraction with at least one improved property relative to the first diesel product fraction, a third product fraction with at least one improved property relative to the first bottoms fraction, and a second common fraction that is passed to the upper undivided volume of the fractionator, in which the second diesel fraction and the third fraction are not recycled to the hydroprocessing. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for producing low sulfur distillate products, comprising:
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hydrotreating a feedstock under effective hydrotreating conditions to produce a hydrotreated feedstock having a sulfur content of about 50 wppm or less; fractionating the hydrotreated feedstock in a first volume of a divided wall column fractionator to produce at least a first diesel fraction and a first bottoms fraction; dewaxing a portion of the first bottoms fraction in the presence of a dewaxing catalyst under effective catalytic dewaxing conditions; and fractionating the dewaxed bottoms fraction in a second volume of the divided wall column fractionator to produce at least a second diesel fraction with at least one improved cold flow property relative to the first diesel fraction and a second bottoms fraction with at least one improved cold flow property relative to the first bottoms fraction; in which the second diesel fraction and the second bottoms fraction are not recycled to the dewaxing stage. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 19)
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16. A method for producing low sulfur distillate products, comprising:
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hydrotreating a feedstock under effective hydrotreating conditions; hydrocracking the hydrotreated feedstock under first effective hydrocracking conditions including a temperature from about 200°
C. to about 450°
C., a hydrogen pressure from about 5 barg (about 0.5 MPag to about 300 barg (about 30 MPag),an LHSV from about 0.05 hr-1 to about 10 hr-1, and a hydrogen treat gas rate from about two times to about fifteen times the hydrogen consumed during the hydrocracking; fractionating the hydrocracked feedstock in a first volume of a divided wall column fractionator to produce at least a first diesel fraction and a first bottoms fraction; hydrocracking, without recycle, a portion of the first bottoms fraction, under effective hydrocracking conditions; and fractionating the hydrocracked first bottoms fraction in a second volume of the divided wall column fractionator to produce at least a second diesel fraction and a second bottoms fraction, wherein the second diesel fraction has at least one improved cold flow property relative to the first diesel fraction, and wherein the second bottoms fraction has at least one improved cold flow property relative to the first bottoms fraction and the second diesel fraction and the second bottoms fraction are not recycled to the first or second hydrocracking step. - View Dependent Claims (17, 18)
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Specification