Patent ID: 9739529
Date: 2017-08-22
CPC Classifications: F25J,Y02C

Claim:
1. A method for separating fluids in a distillation tower, the method comprising: providing a distillation tower comprising a controlled freeze zone section and a rectifier section, wherein the controlled freeze zone section and rectifier section are configured such that a vapor stream rises up from the controlled freeze zone section to the rectifier section; maintaining the rectifier section in the distillation tower; maintaining the controlled freeze zone section in the distillation tower, wherein the controlled freeze zone section forms solids from carbon dioxide within the distillation tower; feeding a stream to the distillation tower, wherein the stream comprises the carbon dioxide; reducing a carbon dioxide concentration of the vapor stream received by the rectifier section by: terminating reducing the carbon dioxide concentration when the carbon dioxide concentration of the vapor stream travelling from the controlled freeze zone section to the rectifier section is less than or equal to a maximum carbon dioxide concentration.