Method and apparatus to start-up a controlled freezing zone...

Details Method and apparatus to start-up a controlled freezing zone... Method and apparatus to start-up a controlled freezing zone...

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 3/02 (2006.01)

Patent

CA 2049236

The invention relates to a method and apparatus for start-up, transformation from start-up to normal operation and normal separation of carbon dioxide and other acid gases from methane using a distillation column with a controlled freezing zone. Normally, the feedstream is treated in at least one distillation zone, a controlled freezing zone, and another acid gas stripping apparatus. The freezing zone produces a carbon dioxide slush which is melted and fed into a distillation section and a methane-enriched stream which is fed to a separate stripping unit. Start-up is accomplished by refluxing the product stream from the separate stripping unit to the distillation column. Transformation is accomplished by separating the methane-enriched stream produced by the freezing zone into a liquid component for refluxing to the column and a vapor component to be fed to the separate stripping unit.

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