# US 2014/0360226 A1 · Module for treatment of carbon dioxide and treatment method thereof

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- Number: US 2014/0360226 A1
- Document ID: US20140360226A1
- Status: Published application
- Kind: A1
- Application number: 14/369,405
- Filed: 2012-08-22
- Published: 2014-12-11
- Earliest claimed: 2011-12-27
- Assignees: Daewoo Shipbuilding & Marine Engineering Co., Ltd.
- Inventors: Byeong Yong Yoo; Sung Bae Kim; Il Guk Woo; Yeong Tae Oh; Hee Seung Na
- Web page: https://patentgrep.com/patent/US20140360226A1

## CPC

- F25J 3/0266: {separation of carbon dioxide (production of carbon dioxide in general C01B32/00)}
- C10L 3/104: {Carbon dioxide}
- F25J 1/0027: {Oxides of carbon, e.g. CO2}
- F25J 3/0209: {Natural gas or substitute natural gas}
- F25J 3/0233: {separation of CnHm with 1 carbon atom or more}
- F25J 2200/02: in a single pressure main column system
- F25J 2200/74: Refluxing the column with at least a part of the partially condensed overhead gas
- F25J 2215/04: Recovery of liquid products
- F25J 2220/82: Separating low boiling, i.e. more volatile components, e.g. He, H2, CO, Air gases, CH4
- F25J 2260/80: Integration in an installation using carbon dioxide, e.g. for EOR, sequestration, refrigeration etc.
- F25J 2270/02: Internal refrigeration with liquid vaporising loop
- F25J 2270/08: Internal refrigeration by flash gas recovery loop
- F25J 2280/40: Control of freezing of components
- F25J 2290/34: Details about subcooling of liquids
- Y02C 20/40: of CO2
- F25J: LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS {OR LIQUEFIED GASEOUS} MIXTURES BY PRESSURE AND COLD TREATMENT {OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE (cryogenic pumps F04B37/08; gas storage vessels, gas holders F17; filing vessels with, or discharging from vessels, compressed, liquefied or solidified gases F17C; refrigeration machines, plants, or systems F25B)}
- 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
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

Liquid carbon dioxide separated from sour gas is expanded by throttling decompression and is gas-liquid separated at a low temperature so as to be supplied for shipping or the improvement of petroleum recovery. Methane generated from a stranded gas well is allowed to pass as a coolant through liquid carbon dioxide separated and discharged from sour gas generated from the stranded gas well so as to cool liquid carbon dioxide. Disclosed is a module for treating carbon dioxide, and a treatment method thereof for supplying liquid carbon dioxide at a proper temperature and state conditions when there is a need for liquid carbon dioxide of very low temperature for the storage or collection of carbon dioxide, the improvement of petroleum recovery, or the like by cooling carbon dioxide using a material separated from sour gas of a stranded gas well as a coolant.

## Claims

### Claim 1

An additional cooling module for liquefied carbon dioxide, comprising:
a separation unit formed at a middle thereof with a controlled freezing zone (CFZ) and discharging methane upwards while discharging carbon dioxide contained in sour gas generated from a stranded gas well downwards;
a gas-liquid separator connected to the separation unit and separating carbon dioxide into gas and liquid; and
an expansion valve disposed between the separation unit and the gas-liquid separator and expanding liquid carbon dioxide discharged from the separation unit by throttling decompression.

### Claim 2 (depends on 1)

The additional cooling module according to claim 1, wherein temperature at an inlet of the expansion valve is higher than temperatures at a gas outlet and a liquid outlet of the gas-liquid separator.

### Claim 3 (depends on 1)

The additional cooling module according to claim 1, wherein the gas-liquid separator discharges gas carbon dioxide upwards and discharges liquid carbon dioxide downwards.

### Claim 4 (depends on 1)

The additional cooling module according to claim 1, wherein the gas-liquid separator comprises:
a liquid discharge pipe through which the liquid carbon dioxide is discharged downwards in a saturated liquid state at −55° C. to −20° C.; and
a flow control valve mounted on an end portion of the liquid discharge pipe and controlling supply of the liquid carbon dioxide to be transported for carbon dioxide capture and storage (CCS) or enhanced oil recovery (EOR).

### Claim 5 (depends on 1)

The additional cooling module according to claim 1, wherein the gas-liquid separator comprises:
a gas discharge pipe through which gas carbon dioxide is discharged upwards; and
a pressure control valve mounted on the gas discharge pipe.

### Claim 6

(canceled)

### Claim 7

An additional cooling method for liquefied carbon dioxide, comprising:
additionally cooling and supplying liquid carbon dioxide in a saturated liquid state at −55° C. to −20° C. for shipping, wherein the liquid carbon dioxide is produced from a separation unit that is formed at a middle thereof with a controlled freezing zone (CFZ) and discharges methane upwards while discharging carbon dioxide contained in sour gas generated from a stranded gas well downwards.

### Claim 8 (depends on 7)

The additional cooling method according to claim 7, wherein the additional cooling is performed by expanding the liquid carbon dioxide discharged from the separation unit through throttling decompression.

### Claim 9 (depends on 7)

The additional cooling method according to claim 7, wherein the additional cooling is performed by
expanding the liquid carbon dioxide discharged from the separation unit through throttling decompression; and
separating a two-phase fluid of gas and liquid carbon dioxide expanded by throttling decompression into gas and liquid carbon dioxide while passing through a gas-liquid separator.

### Claim 10

(canceled)

### Claim 11

A module for treatment of carbon dioxide, comprising:
a separation unit formed at a middle thereof with a controlled freezing zone (CFZ) and discharging methane upwards while discharging carbon dioxide contained in sour gas generated from a stranded gas well downwards; and
a heat exchanger which cools liquid carbon dioxide discharged from the separation unit using the methane discharged from the separation unit as a coolant and is mounted on piping through which the liquid carbon dioxide is discharged from the separation unit.

### Claim 12 (depends on 11)

The module for treatment of carbon dioxide according to claim 11, wherein a decompression valve is mounted on the piping connecting the separation unit and the heat exchanger, or on the piping at an outlet of the heat exchanger.

### Claim 13 (depends on 11)

The module for treatment of carbon dioxide according to claim 11, wherein the liquid carbon dioxide having passed through the heat exchanger is loaded onto a ship and transported for carbon dioxide capture and storage (CCS) or for enhanced oil recovery (EOR).

### Claim 14

(canceled)

### Claim 15

(canceled)

### Claim 16

A method of treating carbon dioxide, comprising:
a first step of supplying sour gas to a separation unit connected to a stranded gas well via piping and fanning a controlled freezing zone (CFZ);
a second step of distilling the sour gas in the separation unit, and discharging methane from the separation unit upwards while discharging liquid carbon dioxide from the separation unit downwards;
a third step of cooling the liquid carbon dioxide by passing the methane as a coolant through a heat exchanger mounted on piping for discharging the liquid carbon dioxide of the separation unit; and
a fourth step of loading a ship with the liquid carbon dioxide having passed through the heat exchanger, and transporting the liquid carbon dioxide for carbon dioxide capture and storage (CCS) or for enhanced oil recovery (EOR).

### Claim 17 (depends on 16)

The method of treating carbon dioxide according to claim 16, wherein the second step further comprises decompressing the liquid carbon dioxide discharged from the separation unit via a decompression valve mounted on the piping between the separation unit and the heat exchanger.

### Claim 18 (depends on 16)

The method of treating carbon dioxide according to claim 16, wherein the second step further comprises decompressing the liquid carbon dioxide discharged from the separation unit via a decompression valve mounted on the piping at an outlet of the heat exchanger.

### Claim at position 19

19-22. (canceled)