Process for the treatment of a product stream

• US 7,923,595 B2
• Filed: 03/26/2007
• Issued: 04/12/2011
• Est. Priority Date: 04/18/2006
• Status: Expired due to Fees

• Current Assignee: Ineos Europe AG (Ineos AG)
• Original Assignee: Ineos Europe Limited (China National Petroleum Corporation)
• Inventors: Williams, Vaughan Clifford
• Primary Examiner(s): Parsa; Jafar
• Application Number:
  US12/225,317
• Publication Number:
  US 20100222440A1
• Time in Patent Office: 1,478 Days
• Field of Search: 585/648, 585/854, 585/868, 585/809, 585/824, 208/67, 208/177
• US Class Current: 585/809
• CPC Class Codes: B01D 53/1456 Removing acid components
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: C10G 11/22 produced by partial combustion of the material to be cracked
• CPC Class Codes: C10G 2400/20 C2-C4 olefins
• CPC Class Codes: C10G 27/04 with oxygen or compounds generating oxygen
• CPC Class Codes: C10G 70/04 by physical processes
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 20/10 Process efficiency
• CPC Class Codes: Y02P 30/40 Ethylene production

Abstract

Process for treating a product stream typically from an autothermal cracking process, the product stream comprising one or more olefins, hydrogen, carbon monoxide, carbon dioxide and one or more oxygenates, by contacting the product stream with at least one compound selected from (1) H₂N—OR₁, and (2) H₂N—NR₂R₃, where R₁, R₂ and R₃ may each be independently selected from H and carbon-containing substituents.

Claims

1. A process for the treatment of a product stream from an autothermal cracking process, said product stream comprising one or more olefins, hydrogen, carbon monoxide, carbon dioxide and one or more oxygenates, and wherein the oxygenates are present in the product stream prior to treatment at a total concentration in the range 100-5000 parts per million by weight, said process comprising

(A) contacting the product stream with an aqueous stream comprising at least one compound selected from those represented by formulas:

(1) H₂N—

OR₁, and

(2) H₂N—

NR₂R₃,

where;

R₁ is selected from H and carbon containing substituents,

R₂ is H, and

R₃ is a ketyl group of formula C(O)NR₄R₅ where R₄ is H or an alkyl and R₅ is H, an alkyl or NH₂,

to provide a selective removal of oxygenates in the presence of carbon dioxide, and

(B) subsequently passing the oxygenate treated stream from step (A) to an amine based carbon dioxide removal system to remove the carbon dioxide therein.

2. A process as claimed in claim 1 where the compound is of formula (1) and is hydroxylamine or an alkoxyamine.

3. A process as claimed in claim 2 wherein the compound is hydroxylamine.

4. A process as claimed in claim 1 wherein the compound is of formula (2) and is selected from semicarbazide and carbohydrazide.

5. A process for the production of olefins by autothermal cracking of a hydrocarbon feed, which process comprises contacting said hydrocarbon feed and a molecular oxygen-containing gas with a catalyst capable of supporting combustion beyond the normal fuel rich limit of flammability to produce a product stream comprising one or more olefins, hydrogen, carbon monoxide, carbon dioxide and one or more oxygenates, and subsequently treating the product stream using the process as claimed in claim 1 to remove oxygenates and carbon dioxide therefrom.