TWO STAGE HYDROPROCESSING WITH DIVIDED WALL COLUMN FRACTIONATOR
First Claim
Patent Images
1. A method for producing low sulfur distillate products, comprising:
- hydrotreating a feedstock under first effective hydrotreating conditions;
fractionating the hydrotreated feedstock in a first volume of a divided wall column fractionator to produce at least a first product fraction, a first bottoms fraction, and a first common fraction that is passed to an upper undivided volume of the fractionator;
dissolving hydrogen in at least a portion of the first bottoms fraction to approximately the solubility limit;
hydrocracking the portion of the first bottoms fraction under effective hydrocracking conditions in a hydrocracking stage having a continuous liquid environment; and
fractionating the hydrocracked first bottoms fraction in a second volume of the divided wall column fractionator to produce at least a second product fraction, a third product fraction, and a second common fraction that is passed to the upper undivided volume of the fractionator,wherein the second product fraction has at least one improved property relative to the first product fraction and the third product fraction has at least one improved property relative to the bottoms fraction.
1 Assignment
0 Petitions
Accused Products
Abstract
A divided wall column can allow 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. At least one reaction stage can advantageously have a continuous liquid phase environment.
-
Citations
19 Claims
-
1. A method for producing low sulfur distillate products, comprising:
-
hydrotreating a feedstock under first effective hydrotreating conditions; fractionating the hydrotreated feedstock in a first volume of a divided wall column fractionator to produce at least a first product fraction, a first bottoms fraction, and a first common fraction that is passed to an upper undivided volume of the fractionator; dissolving hydrogen in at least a portion of the first bottoms fraction to approximately the solubility limit; hydrocracking the portion of the first bottoms fraction under effective hydrocracking conditions in a hydrocracking stage having a continuous liquid environment; and fractionating the hydrocracked first bottoms fraction in a second volume of the divided wall column fractionator to produce at least a second product fraction, a third product fraction, and a second common fraction that is passed to the upper undivided volume of the fractionator, wherein the second product fraction has at least one improved property relative to the first product fraction and the third product fraction has at least one improved property relative to the bottoms fraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for producing low sulfur distillate products, comprising:
-
hydrotreating a feedstock under effective hydrotreating conditions; hydrocracking the hydrotreated feedstock in a first hydrocracking stage under first effective hydrocracking conditions; fractionating the hydrocracked feedstock in a first volume of a divided wall column fractionator to produce at least a first diesel product fraction and a first bottoms fraction; hydrocracking a portion of the first bottoms fraction in a second hydrocracking stage having a continuous liquid environment under second effective hydrocracking conditions; dewaxing the hydrocracked portion of the bottoms fraction in a dewaxing stage having a continuous liquid environment under effective dewaxing conditions; and fractionating the hydrocracked, dewaxed bottoms fraction in a second volume of the divided wall column fractionator to produce at least a second diesel product 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 the second bottoms fraction has at least one improved cold flow property relative to the first bottoms fraction. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
-
Specification