TH29430B - Specific separation and recovery of chlorine from mixed gas - Google Patents

Abstract

Method for separating pure chlorine from chlorinated feed gas by chlorine absorption. using an inert absorber and djorp sun downstream of chlorine from adsorbent mixtures /chlorine removed from the absorption stage by feeding the mixture to the Desorb Sun Distillation Column , which consists of the Desorb Sun Distillation in the Desorb Sun Distillation Column coupled with the Chlorine Separation Column. in such a way that the upper part of the column separates the chlorine and the The upper part of the desorb sun distillation column and the lower part of the desorb sun distillation column and the lower part of the chlorine separation column are connected. on both gas side and liquid side Give an absorbent / chlorine-only mixture to the desorb sun and pure chlorine distillation column from the center of the chlorine separation column.

Claims (3)

1. Procedures for separating pure chlorine from feed gas containing chlorine. By absorption of chlorine using inert absorbent And downstream desorption of chlorine from the absorbent / chlorine mixture released from the absorption process. Which the process consists of; Disposal of the mixture to the desorption distillation column and distillation of the desorpseun in the desorpson distillation column Which is coupled with the chlorine separation column in such a way that The top part of the desorpson distillation column and the bottom part of the desorpson distillation column. And the lower part of the distillation column And the bottom part of the chlorine separation column is connected together on both sides of the gas And the side of the liquid Where the mixture absorbed / Chlorine is sent to the distillation column. And high-purity chlorine is taken from the middle area of the chlorine separation column. 2. Process of claim No. 1, where the chlorine separation column Is the side column 3. The method of claim No. 1, where the chlorine separation column is formed by a wall extending vertically in the desorpson distillation column. 4. Method of claim No. 1 where the column separates Chlorine and de-sorbent distillation columns have an effect height. And where the active height of the chlorine separation column will be 10-90% of the effective height of the desorpson distillation column 5. Method of claim No. 4, where The effective height of the chlorine separation column is 60-70%, that is, the effective height of the desorpson distillation column. 6. Procedure of claim No. 1 where the vapor passes from the lower part of the desorpson distillation column to the bottom of the desorpson distillation column and through the liquid from the top of the desorpson distillation column to the top of the chlorine separation column. And where the vapor taken from the chlorine separation column is passed back to the desorpson distillation column at the Where the liquid is taken out of the desorpion distillation column And where the substance that was brought at the bottom from the chlorine separation column was passed through to the desorpseun distillation column at the height where it was taken out. 7. Procedure of claim 6, where the vapor of The desorpson distillation column is reused to the chlorine absorption stage. 8. Procedure of claim No. 1, where the absorbent / chlorine mixture is removed from the screening process. Being scrubbed in the scrubbing process by using inert liquid Which has a vapor pressure of less than 10 mbar at room temperature The rinsing liquid is distilled to be reused in the Deorp Sun distillation column, at a pressure of 0.1-5 bar and the resulting liquid is returned to the scrubbing process and the resulting absorbent is recovered. Go back to the chlorine absorption step. 9. Process of claim No. 1, for action with the feeder gas line with chlorine. This is obtained by oxidation of hydrogen chloride with oxygen 1 0. Procedure of claim 9 l where hydrogen chloride is obtained from isocyanate production and the extracted chlorine is returned for Prepare phosgene for the production of ivocyanate 1. 1. Procedure of claim 9, where the gases released from the chlorine absorption process are recycled. With or without persistent removal of the absorbent Goes into a step where hydrogen chloride is oxidized with oxygen 1 2.Process for the separation of pure chlorine from a chlorinated gas line, where the chlorinated gas line initially enters the pressure swing, the chlorinated gas from the pressure swing adsorption. At 1-20 bar, then low temperature distillation, the extracted chlorine is purified into the lower part of the distillation column. And the upper product of the distillation column is passed back to the feed gas line of pressure swing absorption 1 3. Procedure of claim 12, where the chlorinated gas is compressed to a pressure of 5-10 bar.