# US 2018/0023012 A1 · Cos and cs2 abatement method

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- Number: US 2018/0023012 A1
- Document ID: US20180023012A1
- Status: Published application
- Kind: A1
- Application number: 15/677,984
- Filed: 2017-08-15
- Published: 2018-01-25
- Earliest claimed: 2013-03-14
- Assignees: Stamicarbon B.V. Acting Under the Name of Mt Innov Ation Center
- Applicants: Stamicarbon B.V. Acting Under the Name of Mt Innovation Center
- Inventors: Michele COLOZZI; Emma PALO; Palma CONTALDO; Maria Rosaria PEPE; Vincenzo PALMA; Vincenzo VAIANO
- Web page: https://patentgrep.com/patent/US20180023012A1

## 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 and/or carbon disulphide from a sour gas stream, wherein the reactor system is filled with an absorption liquid and comprises a catalyst suitable for hydrolyzing carbonyl sulphide and carbonyl disulphide.

### Claim 2 (depends on 1)

The reactor system of claim 1, wherein the reactor system comprises an absorption liquid contained in an absorption column, and wherein the catalyst is present in or on the absorption column.

### Claim 3 (depends on 2)

The reactor system of claim 2, wherein the absorption column comprises trays, wherein the catalyst is a heterogeneous catalyst applied as a coating on the trays.

### Claim 4 (depends on 2)

The reactor system of claim 2, wherein the absorption column is a packed column with a packing, wherein the catalyst is coated on the packing.

### Claim 5 (depends on 1)

The reactor system of claim 1, wherein the reactor system further comprises a contacting device and wherein the catalyst is deposited on said contacting device.

### Claim 6 (depends on 5)

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

### Claim 7 (depends on 1)

The reactor system of claim 1, wherein the catalyst is a transition metal or a salt of a transition metal.

### Claim 8 (depends on 7)

The reactor system of claim 7, 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 9

A reactor system for removing carbonyl sulphide and/or carbon disulphide from a sour gas stream, comprising
an absorption vessel configured to subject the sour gas stream to contact with an absorption liquid so as to produce an absorbed gas-containing liquid, and
a hydrolysis reactor downstream of the absorption vessel in liquid communication with said absorption vessel,
wherein the hydrolysis reactor is filled with an absorption liquid, and comprises a catalyst suitable for hydrolyzing carbonyl sulphide and carbonyl disulphide,
whereby the absorbed gas-containing liquid is contacted with said catalyst in said hydrolysis reactor.

### Claim 10 (depends on 9)

The reactor system of claim 9, wherein the catalyst is a transition metal or a salt of a transition metal.

### Claim 11

A sulfur recovery facility comprising:
a) an acid gas removal unit comprising an absorber and a low pressure (LP) regenerator, wherein the absorber is configured for operating at high pressure (HP), medium pressure (MP), or low pressure (LP),
b) an acid gas enrichment and/or tail gas treatment unit comprising a low pressure/very low pressure (LP/LLP) absorber and an LP regenerator;
c) a sulfur recovery unit; and
d) a COS and/or CS2 hydrolysis reactor;
wherein the COS and/or CS2 hydrolysis reactor is
(i) in the acid gas removal unit at the top of the absorber of the acid gas removal unit or between the bottom of the absorber of the acid gas removal unit and the LP regenerator of the acid gas removal unit; or
(ii) in the acid gas enrichment and/or tail gas treatment unit between the bottom of the absorber of the acid gas enrichment and/or tail gas treatment unit and the LP regenerator of the acid gas enrichment and/or tail gas treatment unit.

### Claim 12 (depends on 11)

The sulfur recovery facility of claim 11, wherein the hydrolysis reactor comprises a catalyst suitable for hydrolyzing carbonyl sulphide and carbonyl disulphide.

### Claim 13 (depends on 12)

The sulfur recovery facility of claim 12, wherein
the sulfur recovery facility comprises the acid gas enrichment unit,
the regenerator of the acid gas removal unit has an outlet for gas connected to an inlet of the acid gas enrichment unit, and
the acid gas enrichment unit has an outlet for gas connected with an inlet of the sulphur recovery unit.

### Claim 14 (depends on 13)

The sulfur recovery facility of claim 13, wherein the hydrolysis reactor is filled with absorption liquid.

### Claim 15 (depends on 14)

The sulfur recovery facility of claim 14, wherein said acid gas removal unit comprises a HP absorber having an inlet for sour gas, an outlet for treated sweet gas, and an outlet for absorption liquid connected to an inlet of said hydrolysis reactor, wherein the hydrolysis reactor comprises a catalyst and has an outlet for liquid connected to an inlet of said regenerator, wherein the regenerator has an outlet for liquid connected with an inlet for liquid of said HP absorber, and wherein said regenerator further has an outlet for gas connected to an inlet of said acid gas enrichment unit.

### Claim 16 (depends on 14)

The sulfur recovery facility of claim 14, wherein said catalyst in said hydrolysis reactor is a transition metal or a salt of a transition metal.

### Claim 17 (depends on 14)

The sulfur recovery facility of claim 14, wherein said absorber of said acid gas enrichment unit has an outlet for liquid connected with an inlet for liquid of said hydrolysis reactor, wherein said hydrolysis reactor comprises a catalyst and has an outlet for liquid connected with an inlet of said regenerator of said acid gas enrichment unit, wherein said regenerator of said acid gas enrichment unit has an outlet for gas connected with an inlet of said sulfur recovery unit, and has an outlet for liquid connected with an inlet of said absorber of said acid gas enrichment unit.

### Claim 18 (depends on 17)

The sulfur recovery facility of claim 17, wherein said catalyst is a transition metal or a salt of a transition metal.