SEPARATING OLEFIN STREAMS
First Claim
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1. A process for making and separating an olefin stream comprising a mixture of olefins into at least two olefin streams, the process comprising the steps of:
- (a) providing an olefin stream to be separated comprising at least about 20 wt % of an olefin selected from the group consisting of ethylene, propylene and combinations thereof and not greater than about 3.0 wt % dienes based on the total weight of the olefin stream;
(b) compressing the olefin stream in a compressor system having a first stage and a second stage to obtain a compressed olefin stream; and
(c) separating the compressed olefin stream into at least two olefin streams.
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Abstract
This invention pertains to separating an olefin stream into at least two olefin streams. The olefin stream that is to be separated is low in diene composition, which allows the olefin stream to be compressed at a relatively high temperature without causing fouling problems in the compressor system. The invention is particularly relevant to separating olefins obtained from an oxygen to olefins unit.
19 Citations
25 Claims
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1. A process for making and separating an olefin stream comprising a mixture of olefins into at least two olefin streams, the process comprising the steps of:
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(a) providing an olefin stream to be separated comprising at least about 20 wt % of an olefin selected from the group consisting of ethylene, propylene and combinations thereof and not greater than about 3.0 wt % dienes based on the total weight of the olefin stream; (b) compressing the olefin stream in a compressor system having a first stage and a second stage to obtain a compressed olefin stream; and (c) separating the compressed olefin stream into at least two olefin streams. - View Dependent Claims (2, 3, 4, 5)
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6. A process for making and separating an olefin stream comprising a mixture of olefins into at least two olefin streams, the process comprising the steps of:
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a) providing an olefin stream to be separated comprising at least about 20 wt % of an olefin selected from the group consisting of ethylene, propylene and combinations thereof and not greater than about 3.0 wt % dienes based on the total weight of the olefin stream; b) compressing the olefin stream in a compressor system having a first stage and a second stage to obtain a compressed olefin stream, wherein the compressed olefin stream exits the first stage and the second stage a temperature of not greater than about 260°
F. (127°
C.) and exits the second stage a pressure of at least about 175 psia (1,207 kPa); andc) separating the compressed olefin stream into at least two olefin streams. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A process for making and separating an olefin stream comprising a mixture of olefins into at least two olefin streams, the process comprising the steps of:
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a) contacting an oxygenate with a molecular sieve catalyst to produce an olefin stream to be separated comprising at least about 20 wt % of an olefin selected from the group consisting of ethylene, propylene and combinations thereof and not greater than about 3.0 wt % dienes based on the total weight of the olefin stream; b) compressing the olefin stream in a compressor system having a first stage and a second stage to obtain a compressed olefin stream, wherein the compressed olefin stream exits the compressor system at a temperature of not greater than about 260°
F. (127°
C.) and exits the second stage a pressure of at least about 175 psia (1,207 kPa); andc) separating the compressed olefin stream into at least two olefin streams. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A process for making and separating an olefin stream comprising a mixture of olefins into at least two olefin streams, the process comprising the steps of:
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a) providing an olefin stream to be separated comprising not greater than about 3.0 wt % dienes based on the total weight of the olefin stream; b) compressing the olefin stream in a compressor system having a first stage and a second stage to obtain a compressed olefin stream; and c) separating the compressed olefin stream into at least two olefin streams. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification