Sequence for separating propylene from cracked gases
First Claim
1. A process for separating propylene from a mixture of cracked hydrocarbons produced by a cracking unit, comprising the steps of:
- (a) separating the mixture in a deethanizer into a deethanizer tops stream and deethanizer bottoms stream;
(b) separating the deethanizer bottoms stream in a debutanizer into a debutanizer tops stream and a debutanizer bottoms stream;
(c) separating the debutanizer tops stream in a depropylenizer into a depropylenizer tops stream comprising propylene and a depropylenizer bottoms stream.
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Accused Products
Abstract
A process sequence for treating cracked gases of heavy feedstocks which preferentially produces propylene to the exclusion of propane, butanes and butenes. The process eliminates the need for a depropanizer with the attendant savings in capital and operating costs. In lieu of a conventional C3 splitter, the process features a depropylenizer, i.e. a distillation tower designed to separate propylene from propane, butanes and butenes. A hydrogenation unit to eliminate contaminants can be placed upstream of the depropylenizer or the depropylenizer can be split into two sections with the hydrogenation unit located between the two sections.
59 Citations
21 Claims
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1. A process for separating propylene from a mixture of cracked hydrocarbons produced by a cracking unit, comprising the steps of:
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(a) separating the mixture in a deethanizer into a deethanizer tops stream and deethanizer bottoms stream; (b) separating the deethanizer bottoms stream in a debutanizer into a debutanizer tops stream and a debutanizer bottoms stream; (c) separating the debutanizer tops stream in a depropylenizer into a depropylenizer tops stream comprising propylene and a depropylenizer bottoms stream. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A process for separating propylene from a mixture of cracked hydrocarbons produced by a cracking unit, comprising the steps of:
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(a) separating the mixture in a deethanizer into a deethanizer tops stream and deethanizer bottoms stream; (b) separating the deethanizer bottoms stream in a debutanizer into a debutanizer tops stream and a debutanizer bottoms stream; (c) treating the debutanizer tops stream in a hydrogenation unit to produce a hydrogenation unit outlet stream; (d) separating the hydrogenation unit outlet stream in a depropylenizer into a depropylenizer tops stream comprising propylene and a depropylenizer bottoms stream. - View Dependent Claims (9, 10, 11)
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12. A process for separating propylene from a mixture of cracked hydrocarbons produced by a cracking unit, comprising the steps of:
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(a) separating the mixture in a demethanizer system into a demethanizer tops stream and demethanizer bottoms stream; (b) separating the demethanizer bottoms stream in a deethanizer into a deethanizer tops stream and deethanizer bottoms stream; (c) separating the deethanizer bottoms stream in a debutanizer into a debutanizer tops stream and a debutanizer bottoms stream; (d) separating the debutanizer tops stream in a depropylenizer into a depropylenizer tops stream comprising propylene and a depropylenizer bottoms stream. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A process for separating propylene from a mixture of cracked hydrocarbons produced by a cracking unit, comprising the steps of:
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(a) separating the mixture in a demethanizer system into a demethanizer tops stream and demethanizer bottoms stream; (b) separating the demethanizer bottoms stream in a deethanizer into a deethanizer tops stream and deethanizer bottoms stream; (c) separating the deethanizer bottoms stream in a debutanizer into a debutanizer tops stream and a debutanizer bottoms stream; (d) treating the debutanizer tops stream in a hydrogenation unit to produce a hydrogenation unit outlet stream; (e) separating the hydrogenation unit outlet stream in a depropylenizer into a depropylenizer tops stream comprising propylene and a depropylenizer bottoms stream. - View Dependent Claims (20, 21)
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Specification