Removal of carbon dioxide from olefin containing streams

• US 4,493,715 A
• Filed: 03/30/1984
• Issued: 01/15/1985
• Est. Priority Date: 12/20/1982
• Status: Expired due to Fees

• Current Assignee: Phillips Petroleum Company (ConocoPhillips)
• Original Assignee: Phillips Petroleum Company (ConocoPhillips)
• Inventors: Hogan, John P., Rease, Charles R.
• Primary Examiner(s): Spitzer, Robert
• Application Number:
  US06/595,134
• Time in Patent Office: 291 Days
• Field of Search: 55/68, 55/74, 423/230, 502/63, 502/405, 502/414, 502/415
• US Class Current: 95/139
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01J 20/08 comprising aluminium oxide or hydroxide; comprising bauxite
• CPC Class Codes: C07C 11/02 Alkenes
• CPC Class Codes: C07C 7/12 by adsorption, i.e. purification or separation of hydrocarbons with the aid of solids, e.g. with ion-exchangers
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 20/151 Reduction of greenhouse gas [GHG] emissions, e.g. CO2
• CPC Class Codes: Y10S 95/90 Solid sorbent

Abstract

A process for the removal of CO₂ from a gaseous stream containing at least one C₂ to C₄ olefin is provided comprising contacting said stream with a regenerable calcined alkali metal compound-treated alumina.

Claims

1. A method for removing low concentrations of CO₂ from a gaseous olefin stream of at least C₂ to C₄ olefins which comprise passing said gaseous olefin stream containing CO₂ into contact with a regenerable, calcined adsorbent consisting essentially of from 1 to 6 weight percent of an alkali metal oxide selected from the group consisting of sodium, potassium and lithium on alumina, said regenerable, calcined adsorbent having been made by (a) contacting alumina with an alkali metal compound selected from the group consisting of sodium, potassium or lithium compounds which are convertible to the metal oxide on calcination, (b) drying the resulting alkali metal compound, treated alumina, and (c) thereafter calcining the dried treated alumina.

2. A process according to claim 1 wherein said olefin stream is ethylene and said alkali metal compound is one selected from the group consisting of hydroxides, nitrates and acetates of sodium, potassium and lithium.

3. A process according to claim 2 wherein said alkali metal compound is selected from the group consisting of lithium hydroxide, sodium hydroxide and potassium hydroxide.

4. A process according to claim 1 wherein said alkali metal oxide is lithium oxide and is present in an amount in the range of about 1 to about 3 weight percent.

5. A process according to claim 1 wherein said alkali metal oxide is sodium oxide and is present in an amount in the range of about 2 to about 4 weight percent.

6. A process according to claim 1 wherein said alkali metal is potassium oxide and is present in an amount in the range of about 3 to about 6 weight percent.