Method for generating refrigeration for a carbon monoxide cold box
AssigneePraxair Technology, Inc.
InventorAndrew M. Warta
Life of this patent
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Abstract
The present invention is directed to a method of separating carbon monoxide from syngas mixtures by cryogenic means where a partial condensation cycle is generally employed, and more specifically varying refrigeration generation based on income feed composition of the hydrocarbon feedstock being processed.
Claims7
A method for the separation of carbon monoxide from a syngas feedstock in a carbon monoxide cold box where the cold box is provided refrigeration based on the composition of the incoming feedstock, comprising:
- cooling and partially condensing the syngas cold box feed stream containing carbon monoxide and hydrogen in a primary heat exchanger to produce a cooled and partially condensed syngas feed stream;
- separating the cooled and partially condensed syngas feed stream into a first hydrogen rich vapor stream and a first carbon monoxide rich liquid stream in a first separator;
- feeding the first carbon monoxide rich liquid stream to a second hydrogen removal separator operating at a pressure lower than the first separator, wherein a second hydrogen rich vapor stream is separated from a second crude carbon monoxide rich liquid stream;
- splitting said second crude carbon monoxide rich liquid stream into two portions wherein a first portion of the second crude carbon monoxide liquid rich stream is at least partially vaporized in the primary heat exchanger and providing a second portion of the second crude carbon monoxide rich liquid stream wherein both portions are introduced into a distillation column for separating purified carbon monoxide product stream from a liquid byproduct stream;
- providing a turbine feed stream to a turbine disposed within said cold box;
- and
- providing a cryogenic fluid feed to said cold box and varying the flow rate based on the composition of the incoming feedstock.
A method for the separation of carbon monoxide from a syngas feedstock in a carbon monoxide cold box where the cold box is provided refrigeration based on the composition of the incoming feedstock, comprising:
- cooling and partially condensing the syngas cold box feed stream containing carbon monoxide and hydrogen in a primary heat exchanger to produce a cooled and partially condensed syngas feed stream;
- separating the cooled and partially condensed syngas feed stream into a first hydrogen rich vapor stream and a first carbon monoxide rich liquid stream in a first separator;
- feeding the first carbon monoxide rich liquid stream to a second hydrogen removal separator operating at a pressure lower than the first separator, wherein a second hydrogen rich vapor stream is separated from a second crude carbon monoxide rich liquid stream;
- splitting said second crude carbon monoxide rich liquid stream into two portions wherein a first portion of the second crude carbon monoxide liquid rich stream is at least partially vaporized in the primary heat exchanger and providing a second portion of the second crude carbon monoxide rich liquid stream wherein both portions are introduced into a distillation column for separating purified carbon monoxide product stream from a liquid byproduct stream;
- and
- providing a cryogenic fluid feed to said cold box and varying the flow rate based on the composition of the incoming feedstock.
Dependencies are inferred from the claim text.