24-08-2017 дата публикации
Номер: US20170239614A1
Принадлежит:
A demethanizer employing C3, C4 and C4+ hydrocarbons as absorbents can be employed in a methanol to olefin process to reduce both operating and capital costs in comparison to a convention process which employs only cryogenic distillation to remove methane and other low boilers from a light olefin process stream. By reducing the use of propane, the size and operating costs of the C3 splitter can be reduced thereby providing an economic advantage over conventional applications. 1. A method for producing olefins from methanol , the method comprising employing a demethanizer to remove methane from a light olefin containing process stream wherein the demethanizer uses an absorbent selected from the group consisting of C3 , C4 , and C4+ hydrocarbons , and combinations thereof , wherein when the absorbent is a C3 hydrocarbon it is not exclusively propane.2. The method of claim 1 , wherein propane makes up less than ten percent of the total amount of the selected absorbent.3. The method of claim 1 , wherein propane makes up less than one percent of the total amount of the selected absorbent.4. The method of claim 1 , wherein an effluent of the demethanizer is sent to a deethanizer.5. The method of claim 4 , wherein a first portion of an effluent from the deethanizer is returned to the demethanizer.6. The method of claim 5 , wherein a second portion of the effluent from the deethanizer is sent to a debutanizer.7. The method of claim 6 , wherein a portion of an effluent of the debutanizer is sent to the demethanizer.8. The method of claim 5 , wherein a third portion of the effluent from the deethanizer is sent to a C3 splitter.9. The method of claim 8 , wherein a portion of an effluent of the C3 splitter is sent to the demethanizer.10. A system for producing olefins from methanol claim 8 , comprising:demethanizer configured to remove methane from a light olefin containing process stream wherein the demethanizer uses an absorbent selected from the group consisting of C3, C4, ...
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