Propylene distillation

• US 3,002,358 A
• Filed: 08/01/1960
• Issued: 10/03/1961
• Est. Priority Date: 08/01/1960
• Status: Expired due to Term

• Current Assignee: Dierl Alwien M H
• Original Assignee: Dierl Alwien M H
• Inventors: DIERL ALWIEN M H
• Application Number:
  US04/046,449
• Time in Patent Office: 428 Days
• US Class Current: 62/630
• CPC Class Codes: C07C 11/06 Propene
• CPC Class Codes: C07C 7/04 by distillation

Claims

1. PROCESS FOR THE PRODUCTION OF TWO PROPYLENE PRODUCTS OF DIFFERENT PROPYLENE PURITIES FROM A MIXED PROPYLENE/ PROPANE FEED STREAM COMPRISING THE STEPS OF INTRODUCING MIXED PROPYLENE/PROPANE FEED INTO A HIGH PURITY PROENE PRODUCT DISTILLATION ZONE AND INTO A LOW PURITY PROPYLENE PRODUCT DISTILLATION ZONE, RESPECTIVELY, THE PRESSURE AND TEMPERATURE IN SAID HIGH PURITY ZONE BEING LOWER THAN THE PRESSURE AND TEMPERATURE IN SAID LOW PURITY ZONE, SEPARATING BY DISTILLATION IN EACH OF SAID ZONE AN OVERHEAD VAPOR PRODUCT AND A BOTTOMS MATERIAL, PASSING AT LEAST A PORTION OF SAID OVERHEAD PRODUCT FROM ONE OF SAID ZONES THROUGH A COMPRESSION-HEATING, INDIRECT COOLING AND EXPANSION TRAIN AND THEREBY PRODUCING A PROPYLENE STREAM HAVING A LOWER TEMPERATURE THAN THE OVERHEAD FROM THE OTHER OF SAID ZONES AND USING AT LEAST A PORTION OF SAID LOWER TEMPERATURE PROPYLENE STREAM AS INDIRECT REFRIGERATION FOR REFLUX FOR THE PROPYLENE DISTILLATION IN SAID OTHER ZONE.