CN113398717A - Process method for reducing loss of low-temperature methanol washing system - Google Patents
Process method for reducing loss of low-temperature methanol washing system Download PDFInfo
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- CN113398717A CN113398717A CN202110598524.5A CN202110598524A CN113398717A CN 113398717 A CN113398717 A CN 113398717A CN 202110598524 A CN202110598524 A CN 202110598524A CN 113398717 A CN113398717 A CN 113398717A
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- methanol
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- tail gas
- carbon dioxide
- liquid
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 294
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000005406 washing Methods 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 title claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 85
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 80
- 238000000926 separation method Methods 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 41
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 40
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 35
- 230000008929 regeneration Effects 0.000 claims abstract description 35
- 238000011069 regeneration method Methods 0.000 claims abstract description 35
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000002253 acid Substances 0.000 claims description 13
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 9
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 claims description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims 1
- 239000012071 phase Substances 0.000 abstract description 9
- 239000007791 liquid phase Substances 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 5
- 239000003245 coal Substances 0.000 abstract description 4
- 238000005191 phase separation Methods 0.000 abstract description 2
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1468—Removing hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1462—Removing mixtures of hydrogen sulfide and carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1475—Removing carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/202—Alcohols or their derivatives
- B01D2252/2021—Methanol
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a process method for reducing the loss of a low-temperature methanol washing system, which relates to the field of coal chemical industry and comprises a tail gas liquid separating tank, a carbon dioxide separation tower and a methanol regeneration tower, wherein two ends of the carbon dioxide separation tower are respectively connected with the tail gas liquid separating tank and the methanol regeneration tower, and the process method also comprises the following steps: the method comprises the following steps: introducing stripping nitrogen into the carbon dioxide separation tower, and discharging gas phase tail gas and methanol liquid from the carbon dioxide separation tower; step two: the gas phase tail gas of the carbon dioxide separation tower enters a tail gas separating tank, is separated by the tail gas separating tank and then is discharged out of the tail gas separating tank, and is introduced into a tail gas removing washing tower for washing treatment; the invention adopts a mode of additionally arranging the tail gas liquid separation tank on the tail gas pipeline of the carbon dioxide separation tower to carry out gas-liquid phase separation on the tail gas, recover the liquid-phase methanol into a methanol system, and greatly increase the amount of stripping nitrogen to ensure that the nitrogen is excessive, thereby reducing the influence on the methanol regeneration tower when the flow of the methanol is higher.
Description
Technical Field
The invention relates to the field of coal chemical industry, in particular to a process method for reducing loss of a low-temperature methanol washing system.
Background
In the chemical production process, raw materials represented by petroleum and coal often contain a certain amount of impurity acid gases such as H2S, SO2 and CO2 which are harmful to main reaction. It needs to be removed by a certain process. Common acid gas removal processes include chemical absorption, physical chemical absorption and physical absorption. In the domestic coal chemical industry acid gas removal device, the adopted method mainly adopts a low-temperature methanol washing method and a polyethylene glycol dimethyl formamide (NHD) method. The NHD method has simple flow and low investment cost, but the required circulating water, the gas stripping and the effective gas loss are large; the initial investment of the low-temperature methanol washing process is high, but the low-temperature methanol washing process has obvious advantages in the aspects of separation effect, energy conservation, consumption reduction and the like. In the existing process flow for removing the acid gas in the gas by adopting a low-temperature methanol washing mode, after the acid gas is adsorbed and removed from the process gas by low-temperature methanol, as the solubility of CO2 in the methanol is lower than that of H2S, CO2 is firstly separated in a CO2 separation tower in the methanol regeneration process and is discharged along with tail gas. During the subsequent methanol regeneration, H2S gas separates out from the top of the regenerator due to the increase in the regenerator temperature. In order to ensure the H2S removal effect in the whole process, the whole desulfurization and decarburization system is required to be carried out under the condition of poor methanol and large flow, so that the methanol regeneration tower has high load and high loss, part of methanol steam is discharged along with tail gas, and the methanol self-consumption is higher.
Disclosure of Invention
The invention provides a process method for reducing the loss of a low-temperature methanol washing system, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a process method for reducing the loss of a low-temperature methanol washing system comprises a tail gas liquid separating tank, a carbon dioxide separation tower and a methanol regeneration tower, wherein two ends of the carbon dioxide separation tower are respectively connected with the tail gas liquid separating tank and the methanol regeneration tower, and the process method further comprises the following steps:
the method comprises the following steps: introducing stripping nitrogen into the carbon dioxide separation tower, and discharging gas phase tail gas and methanol liquid from the carbon dioxide separation tower;
step two: the gas phase tail gas of the carbon dioxide separation tower enters a tail gas separating tank, is separated by the tail gas separating tank and then is discharged out of the tail gas separating tank, and is introduced into a tail gas removing washing tower for washing treatment;
step three: separating methanol liquid from the tail gas liquid separating tank, mixing the methanol liquid with the methanol liquid in the carbon dioxide separation tower, and conveying the mixture to an acid gas methanol washing tower;
step four: and conveying the methanol liquid in the carbon dioxide separation tower to a methanol regeneration tower to realize methanol regeneration.
In a preferred embodiment of the present invention, the methanol liquid separated in the carbon dioxide separation tower is delivered to the methanol regeneration tower by a tower bottom pump, and the methanol liquid separated in the carbon dioxide separation tower is delivered to the acid gas methanol washing tower by an inter-tower pump.
As a preferable technical solution of the present invention, a hot side and a cold side are provided inside the tower bottom of the methanol regeneration tower in the fourth step, and the hot side is connected with a reboiler.
As a preferable technical scheme of the invention, the methanol regeneration tower in the fourth step is connected with a methanol/methanol water separation tower at the hot side.
As a preferable technical scheme of the invention, the cold side in the methanol regeneration tower is connected with a cold side formaldehyde deacidification gas washing tower.
As a preferred technical scheme of the invention, the methanol regeneration tower in the fourth step is connected with an acid gas desulfurization component treatment device.
The invention has the following advantages: the invention adopts a mode of additionally arranging the tail gas liquid separation tank on the tail gas pipeline of the carbon dioxide separation tower to carry out gas-liquid phase separation on the tail gas, recover the liquid-phase methanol into a methanol system, and greatly increase the amount of stripping nitrogen to ensure that the nitrogen is excessive, thereby reducing the influence on the methanol regeneration tower when the flow of the methanol is higher.
Drawings
FIG. 1 is a schematic diagram of a process for reducing the loss of a low temperature methanol wash system.
In the figure: 1. a carbon dioxide separation column; 2. separating the tail gas into liquid tanks; 3. a methanol regeneration tower.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Example 1
Referring to fig. 1, a process for reducing the loss of a low-temperature methanol washing system includes a tail gas liquid separating tank 2, a carbon dioxide separation tower 1 and a methanol regeneration tower 3, wherein two ends of the carbon dioxide separation tower 1 are respectively connected with the tail gas liquid separating tank 2 and the methanol regeneration tower 3, and further includes the following steps:
the method comprises the following steps: introducing stripping nitrogen into the carbon dioxide separation tower 1, and discharging gas phase tail gas and methanol liquid from the carbon dioxide separation tower 1;
step two: the gas phase tail gas of the carbon dioxide separation tower 1 enters a tail gas liquid separation tank 2, the tail gas liquid separation tank 2 is separated and then the gas phase tail gas of the tail gas liquid separation tank 2 is discharged, and the gas phase tail gas of the tail gas liquid separation tank 2 is introduced into a tail gas removing washing tower for washing treatment;
step three: separating methanol liquid from the tail gas liquid separation tank 2, mixing the methanol liquid with the methanol liquid in the carbon dioxide separation tower 1, and conveying the mixture to an acid gas methanol washing tower;
step four: and the methanol liquid in the carbon dioxide separation tower 1 is conveyed to a methanol regeneration tower 3 to realize methanol regeneration.
The methanol liquid separated in the carbon dioxide separation tower 1 is conveyed to the methanol regeneration tower 3 through a tower bottom pump, and the methanol liquid separated in the carbon dioxide separation tower 1 is conveyed to the acid gas methanol washing tower through an inter-tower pump.
And in the fourth step, a hot side and a cold side are arranged inside the tower bottom of the methanol regeneration tower 3, and the hot side is connected with a reboiler.
And the methanol regeneration tower 3 in the fourth step is connected with a hot-side methanol dealcoholization water separation tower.
And the cold side in the methanol regeneration tower 3 is connected with a cold side formaldehyde deacidification gas washing tower.
And the methanol regeneration tower 3 in the fourth step is connected with an acid gas desulphurization component treatment device.
The method adopts a mode of additionally arranging the tail gas liquid separation tank 2 on a tail gas pipeline of the CO2 separation tower to separate the gas phase and the liquid phase of methanol steam carried in the tail gas from H2S tail gas, recovers the liquid phase methanol into a methanol system, and greatly increases the amount of gas stripping to ensure that the gas stripping is excessive so as to reduce the influence on the methanol regeneration tower 3 when the flow of the methanol is higher.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The process method for reducing the loss of the low-temperature methanol washing system is characterized by comprising a tail gas liquid separating tank, a carbon dioxide separation tower and a methanol regeneration tower, wherein two ends of the carbon dioxide separation tower are respectively connected with the tail gas liquid separating tank and the methanol regeneration tower, and the process method further comprises the following steps:
the method comprises the following steps: introducing stripping nitrogen into the carbon dioxide separation tower, and discharging gas phase tail gas and methanol liquid from the carbon dioxide separation tower;
step two: the gas phase tail gas of the carbon dioxide separation tower enters a tail gas separating tank, is separated by the tail gas separating tank and then is discharged out of the tail gas separating tank, and is introduced into a tail gas removing washing tower for washing treatment;
step three: separating methanol liquid from the tail gas liquid separating tank, mixing the methanol liquid with the methanol liquid in the carbon dioxide separation tower, and conveying the mixture to an acid gas methanol washing tower;
step four: and conveying the methanol liquid in the carbon dioxide separation tower to a methanol regeneration tower to realize methanol regeneration.
2. The process for reducing the loss of a low-temperature methanol washing system according to claim 1, wherein the methanol liquid separated in the carbon dioxide separation tower is delivered to the methanol regeneration tower through a tower bottom pump, and the methanol liquid separated in the carbon dioxide separation tower is delivered to the acid gas methanol washing tower through an inter-tower pump.
3. The process method for reducing the loss of the low-temperature methanol washing system according to claim 1, wherein the methanol regeneration tower in the fourth step is provided with a hot side and a cold side at the bottom, and the hot side is connected with a reboiler.
4. The process for reducing the loss of a low-temperature methanol washing system according to claim 3, wherein the methanol regeneration tower in the fourth step is connected with a hot-side methanol water separation tower.
5. A process for reducing the losses in a cryogenic methanol wash system as in claim 3 wherein the cold side in the methanol regenerator is connected to a cold side formaldehyde deacidification gas wash column.
6. The process of claim 3, wherein the methanol regeneration tower in step four is connected to a sour gas desulfurization component treatment unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110598524.5A CN113398717A (en) | 2021-05-31 | 2021-05-31 | Process method for reducing loss of low-temperature methanol washing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110598524.5A CN113398717A (en) | 2021-05-31 | 2021-05-31 | Process method for reducing loss of low-temperature methanol washing system |
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| Publication Number | Publication Date |
|---|---|
| CN113398717A true CN113398717A (en) | 2021-09-17 |
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| CN202110598524.5A Withdrawn CN113398717A (en) | 2021-05-31 | 2021-05-31 | Process method for reducing loss of low-temperature methanol washing system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4475347A (en) * | 1982-09-16 | 1984-10-09 | Air Products And Chemicals, Inc. | Process for separating carbon dioxide and sulfur-containing gases from a synthetic fuel production process off-gas |
| CN101016492A (en) * | 2006-10-30 | 2007-08-15 | 河南中原绿能高科有限责任公司 | Low-temperature methanol washing process for decarbonization and desulfurization of natural gas feed gas |
| CN108977236A (en) * | 2018-08-29 | 2018-12-11 | 国家能源投资集团有限责任公司 | A kind of providing method of rectisol system and synthesis gas |
| EP3476459A1 (en) * | 2017-10-24 | 2019-05-01 | L'air Liquide, Société Anonyme Pour L'Étude Et L'exploitation Des Procédés Georges Claude | Assembly and method for the separation of methanol from components containing sulphur |
-
2021
- 2021-05-31 CN CN202110598524.5A patent/CN113398717A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4475347A (en) * | 1982-09-16 | 1984-10-09 | Air Products And Chemicals, Inc. | Process for separating carbon dioxide and sulfur-containing gases from a synthetic fuel production process off-gas |
| CN101016492A (en) * | 2006-10-30 | 2007-08-15 | 河南中原绿能高科有限责任公司 | Low-temperature methanol washing process for decarbonization and desulfurization of natural gas feed gas |
| EP3476459A1 (en) * | 2017-10-24 | 2019-05-01 | L'air Liquide, Société Anonyme Pour L'Étude Et L'exploitation Des Procédés Georges Claude | Assembly and method for the separation of methanol from components containing sulphur |
| CN108977236A (en) * | 2018-08-29 | 2018-12-11 | 国家能源投资集团有限责任公司 | A kind of providing method of rectisol system and synthesis gas |
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