Integrated process to recover high quality native CO2 from a sour gas comprising H2S and CO2

Patent metadata

Field	Value
Publication number	US-10040051-B2
Application number	US-201715485881-A
Country	US
Kind code	B2
Filing date	Apr 12, 2017
Priority date	Dec 10, 2012
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

The invention concerns a method for treating a hydrocarbon feed gas stream containing at least CO 2 and H 2 S to recover a high quality purified CO 2 gas stream, comprising a. Separating said hydrocarbon feed gas stream into a sweetened hydrocarbon gas stream, and an acid gas stream; b. Introducing said gas stream into a Claus unit, c. Introducing the tail gas into a hydrogenation reactor and then into a quench contactor of the Tail Gas Treatment Unit (TGTU); d. Contacting said tail gas stream with a non-selective amine-based solvent into a non-selective acid gas absorption unit of the TGTU; e. Sending the off gas to an incinerator; f. Contacting said enriched gas stream (vii) with a selective H 2 S-absorption solvent into a selective H 2 S-absorption unit thereby recovering a highly purified CO 2 gas stream and a H 2 S-enriched gas stream, as well as the device for carrying said method.

First claim

The invention claimed is:

1. A device for treating a hydrocarbon feed gas stream containing at least carbon dioxide and hydrogen sulfide to recover a purified CO 2 gas stream, the device comprising in the direction of flow:
an acid gas removal unit;
a Claus unit;
a tail gas treatment unit for removing sulfur components wherein the tail gas treatment unit comprises a hydrogenation reactor for converting sulfur compounds of the tail gas stream into H 2 S, a quench contactor for removing water from the gas stream and a non-selective acid gas absorption unit which comprises an amine based solvent for separating carbon dioxide and hydrogen sulfide from the other constituents of the tail gas stream, said amine-based solvent adsorbing both carbon dioxide and hydrogen sulfide;
a selective H 2 S-absorption unit; and
an incinerator connected at an outlet of the non-selective acid gas absorption unit for incinerating the off gas exiting the non-selective acid gas absorption unit.

2. The device according to claim 1 , wherein the tail gas treatment unit further comprises a feed inline burner or a tail gas heater before the hydrogenation reactor.

3. The device according to claim 1 , wherein the selective H 2 S-absorption unit comprises a recycle line for recycling the H2S-enriched gas stream upstream of or directly to the Claus furnace.

Assignees

• Total Sa

Inventors

• Weiss Claire
• Ghodasara Kamlesh
• Derriche Bassame

Classifications

• B01D2257/302

  Sulfur oxides · CPC title

• B01D2256/245

  Methane · CPC title

• C01B17/0456

  the hydrogen sulfide-containing gas being a Claus process tail gas · CPC title

• C01B17/0408

  Pretreatment of the hydrogen sulfide containing gases · CPC title

• B01J19/24

  Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02) · CPC title