Back to results
US 2021/0230489 A1Published application
Integrated stabilizer for two stage c7 isomerization
AssigneeUop LLC
InventorsCharles P. Luebke, Lin Jin, Cora Wang Ploentham
Life of this patent
Estimating the term…
Abstract
Improved processes for production of gasoline with 95 RONC including a C5-C6 isomerization zone, two C7 isomerization zones, and a reforming zone are described. The first and second C7 isomerization zones share a common stabilizer which strips off the chlorides and removes the light ends. The capital and operating costs of the processes are reduced through the elimination of one of the stabilizer columns and the associated condenser, receiver, trim cooler, and reboiler. The processes improve the RONC of the C7 isomerization product because unconverted methylcyclohexane is recycled back to the second C7 isomerization zone to be converted into dimethylcyclopentane.
Claims20
A process for production of gasoline comprising:
- separating a naphtha feed in a naphtha splitter into a light stream comprising C6 and lighter boiling hydrocarbons, a C7 stream comprising C7 hydrocarbons, and a heavy stream comprising C8 and heavier hydrocarbons;
- isomerizing at least a portion of the light stream from the naphtha splitter in a C5-C6 isomerization zone at isomerization conditions to form a C5-C6 isomerization effluent;
- isomerizing the C7 stream from the naphtha splitter in a first C7 isomerization zone at first isomerization conditions favoring the formation of multi-branched C7 paraffins to form a first C7 isomerization effluent;
- introducing the first C7 isomerization effluent into a single stabilizer column to remove chloride compounds and light ends to form a stabilized C7 isomerization effluent;
- deisoheptanizing at least a portion of the first stabilized C7 isomerization effluent in a deisoheptanizer into at least a first stream comprising multi-branched C7 paraffins and C7 cyclopentanes and a second stream comprising n-C7 paraffins and C7 cyclohexane hydrocarbons;
- isomerizing the second stream from the deisoheptanizer in a second C7 isomerization zone at second isomerization conditions favoring the formation of cyclopentanes over cyclohexanes to form a second C7 isomerization effluent;
- recycling at least a portion of the second C7 isomerization effluent to the stabilizer column;
- reforming the heavy stream from the naphtha splitter in a reforming zone under reforming conditions forming a reformate effluent;
- blending one or more of:
- at least a portion of the C5-C6 isomerization effluent, the first stream from the deisoheptanizer, or the reformate effluent to form a gasoline blend.
7 more elements
A process for production of gasoline comprising:
- separating a naphtha feed in a naphtha splitter into a light stream comprising C6 and lighter boiling hydrocarbons, a C7 stream comprising C7 hydrocarbons, and a heavy stream comprising C8 and heavier hydrocarbons;
- isomerizing at least a portion of the light stream from the naphtha splitter in a C5-C6 isomerization zone at isomerization conditions to form a C5-C6 isomerization effluent;
- isomerizing the C7 stream from the naphtha splitter in a first C7 isomerization zone at first isomerization conditions favoring the formation of multi-branched C7 paraffins to form a first C7 isomerization effluent;
- introducing the first C7 isomerization effluent into a single stabilizer column to form an overhead stream and a first stabilized C7 isomerization effluent;
- introducing a gas stream from the overhead stream of the stabilizer column into a chloride removal section to remove the chloride compounds;
- deisoheptanizing at least a portion of the first stabilized C7 isomerization effluent in a deisoheptanizer into at least a first stream comprising multi-branched C7 paraffins and C7 cyclopentanes and a second stream comprising n-C7 paraffins and C7 cyclohexane hydrocarbons;
- isomerizing the second stream from the deisoheptanizer in a second C7 isomerization zone at second isomerization conditions favoring the formation of cyclopentanes over cyclohexanes to form a second C7 isomerization effluent;
- recycling at least a portion of the second C7 isomerization effluent to the stabilizer column;
- reforming the heavy stream from the naphtha splitter in a reforming zone under reforming conditions forming a reformate effluent;
- blending one or more of:
- at least a portion of the C5-C6 isomerization effluent, the first stream from the deisoheptanizer, or the reformate effluent to form a gasoline blend.
8 more elements
Dependencies are inferred from the claim text.