# US 10,865,355 B2 · COS and CS2 abatement method

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- Number: US 10,865,355 B2
- Document ID: US10865355B2
- Status: Granted
- Kind: B2
- Application number: 15/677,984
- Filed: 2017-08-15
- Published: 2018-01-25
- Granted: 2020-12-15
- Earliest claimed: 2013-03-14
- Assignees: Stamicarbon B.V.
- Applicants: Stamicarbon B.V.
- Inventors: Michele Colozzi; Emma Palo; Palma Contaldo; Maria Rosaria Pepe; Vincenzo Palma; Vincenzo Vaiano
- Web page: https://patentgrep.com/patent/US10865355B2

## CPC

- B01D 53/48: Sulfur compounds
- B01D 53/1456: {Removing acid components}
- B01J 19/24: Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02)
- B01J 23/06: of zinc, cadmium or mercury
- B01J 23/22: Vanadium
- B01J 23/26: Chromium
- B01J 23/28: Molybdenum
- B01J 23/34: Manganese
- B01J 23/462: {Ruthenium}
- B01J 23/745: Iron
- B01J 23/755: Nickel
- C07C 7/14875: {with organic compounds (organo-metallic compounds C07C7/173)}
- C10L 3/103: {Sulfur containing contaminants}
- B01D 2257/308: Carbonoxysulfide COS
- B01J 2219/24: Stationary reactors without moving elements inside
- C10L 2290/06: Heat exchange, direct or indirect
- C10L 2290/541: Absorption of impurities during preparation or upgrading of a fuel
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS

## Abstract

Disclosed is method for removing carbonyl sulphide and/or carbon disulphide from a sour gas stream. The method comprises subjecting the gas stream to simultaneous contact with an absorption liquid, such as an aqueous amine solution, and with a catalyst suitable for hydrolyzing carbonyl sulphide and/or carbon disulphide. To this end, the invention also provides a reactor system wherein both an absorption liquid and a catalyst are present. In a preferred embodiment, the catalyst is a heterogeneous catalyst present on or in an absorption column, either coated on the trays of a column with trays, or contained in the packing of a packed column.

## Claims

### Claim 1

A reactor system for removing carbonyl sulphide (COS) and/or carbon disulphide (CS2) from a sour gas stream, wherein the reactor system comprises an absorption column, wherein the absorption column contains an absorption liquid and comprises a catalyst suitable for hydrolyzing COS and CS2, wherein the catalyst is a transition metal or a salt of a transition metal, and wherein the catalyst is present in or on the absorption column.

### Claim 2 (depends on 1)

The reactor system of claim 1, wherein the absorption column comprises trays, wherein the catalyst is a heterogeneous catalyst applied as a coating on the trays.

### Claim 3 (depends on 1)

The reactor system of claim 1, wherein the absorption column is a packed column with a packing, wherein the catalyst is coated on the packing.

### Claim 4 (depends on 1)

The reactor system of claim 1, wherein the catalyst is selected from the group consisting of vanadium, iron, molybdenum, ruthenium, manganese, chromium, zinc, nickel, and salts thereof, and combinations thereof.

### Claim 5

A reactor system for removing COS and/or CS2 from a sour gas stream, comprising
an absorption vessel that is configured to subject the sour gas stream to contact with an absorption liquid so as to produce a liquid stream containing absorbed gas and having an outlet for said liquid stream; and
a hydrolysis reactor having an inlet that is connected to said outlet for said liquid stream of said absorption vessel and that is configured to receive said liquid stream from said absorption vessel,
wherein the hydrolysis reactor comprises a catalyst suitable for hydrolyzing COS and CS2, and
whereby the liquid stream is contacted with said catalyst in said hydrolysis reactor.

### Claim 6 (depends on 5)

The reactor system of claim 5, wherein the catalyst is a transition metal or a salt of a transition metal.

### Claim 7 (depends on 1)

The reactor system of claim 1, wherein the absorption liquid is an alcohol or a basic aqueous solution.

### Claim 8 (depends on 5)

The reactor system of claim 5, wherein said hydrolysis reactor further comprises a contacting device and wherein the catalyst is deposited on said contacting device, wherein said contacting device is selected from the group consisting of filtering media, vane packs, corrugated plates, coalescing media, and flashing devices.

### Claim 9 (depends on 5)

The reactor system of claim 5, wherein said reactor system further comprises a regenerator connected to a liquid outlet of the hydrolysis reactor and wherein the outlet of said absorption vessel is at the bottom of the absorption vessel and is connected to said inlet of said hydrolysis reactor that configured to receive liquid from said absorption vessel.

### Claim 10 (depends on 1)

The reactor system of claim 1, wherein the absorption column has a top and a bottom, and has a liquid inlet for the absorption liquid at said top and a liquid outlet at said bottom, and an inlet for said sour gas stream at said bottom and an outlet for a treated gas stream at said top.