GB2516994A - Introduction of CO2 for reduction of start-up time in a gas stream separation process - Google Patents
Introduction of CO2 for reduction of start-up time in a gas stream separation process Download PDFInfo
- Publication number
- GB2516994A GB2516994A GB1321538.9A GB201321538A GB2516994A GB 2516994 A GB2516994 A GB 2516994A GB 201321538 A GB201321538 A GB 201321538A GB 2516994 A GB2516994 A GB 2516994A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gas stream
- stream separation
- carbon dioxide
- separation process
- time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/304—Hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
-
- 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
Landscapes
- 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)
- Carbon And Carbon Compounds (AREA)
Abstract
A method and system of reducing start-up time for a gas stream separation process comprising introducing carbon dioxide (CO2) into the gas stream separation process before providing feed-in product to the process. The system comprises a gas stream separation apparatus 10 including a feed-in assembly and a source of carbon dioxide 12 in fluid communication with the apparatus. Preferably the separation process removes an acid gas using an organic solvent such as methanol at subzero temperatures. Advantageously the carbon dioxide is absorbed by circulated methanol and generates additional cold by degassing of the carbon dioxide after depressurization.
Description
INTRODUCTION OF CO2 FOR REDUCTION OF STARTUP TIME
IN A GAS STREAM SEPARATION PROCESS
BACKGROUND
[0001] The present embodiments relate to controing start-up Umes For a gas stream separation process such as a Rectisol® process.
[0002] A Rectiso process (hereinaFter also referred to as the "process") is a physical add gas removal process using an organic solvent, usuaUy methanol, at subzero temperatures. The process is used to decompose, purify and scrub gas streams.
[0003] The main advantages of the process are ow utihty consumpfion, use of an inexpensive and easily avatbie solvent, and flexibffity in the process configuration for application thereof. The process and related equipment can purify synthesis gas down to as low as 0.1 vppm total sulfur (including COS) and CO2 in ppm range.
[0004] The process is desirable for using the methanol solvent to separate acid gases, such as hydrogen sulfide and carbon dioxide, from valuable feed gas streams. This makes the feed gas more suitable and therefore desirable for combustion and/or further processing.
[0005] In order to achieve the design purification of a treated feed gas, the Rectisol® process relies upon using low temperatures. The low temperature cooling is typically achieved through two steps: [0006] 1. pm-cooling the feed ace to an intermediate temperature ev& by a refrigerant, and [0007] 2. final cooflng of the feed gas to the designed temperature level after introducUon of feed gas by flashing of absorbed CO2.
[0008] As both steps are required in order to obtain the designed treated gas purities, each step defines the actual duration of time for start-up for the process, [0009] During startup of the wash unit for the process, product gases typicafly have to be flared untU on-specification (on-spec") product quality is achieved. A major factor to achieve this product quaflty is the correct low temperature level within the process. Consequently, the period of flaring depends largely on the lime necessary for cool down of the process. Unfortunately, extended flaring time recuRs in additional unwanted emissions and lower production efficiency of the process and resufting application.
BRIEF DESCRIPTION OF THE DRAWING
[0010] For a more complete understanding of the present embodiments, reference may be had to the following description taken in conjunction with the drawing Figure, of which: [0011] The Figure shows a schematic of a flow scheme of a process according to the present embodiments.
DETAILED DESCRIPTION OF THE INVENTION
(0012) AccordIng to the apparatus embodiment shown generally at 10 In the Figure. after an absorber is pressurized by nitrogen (N2), methanol circulation Is established and, as provided by the present embodiments, carbon dioxide (C02) 12 Is Introduced or Imported into an absorber.
(0013] The addition of the CO2 is absorbed by the circulated methanol and generates additional cold by degassing of the loaded 002 after depressurizatlon.
This results In cooling down and permits the establishment of a low temperature level of the process prior to feed in.
(0014] A portion of the degassed CO2 can be re-compressed and recycled via the Installed recycle compressor to the absorber column to minimize the CO2 added to the process.
(0015] DependIng on the CO2 pressure level available, CO2 can be provided to the absorber directly or via an Installed recycle compressor. For example, In one application, which does not have significant additional equipment or an external CO2 import source requirement, a multiple Rectlsol® train configuration with a CO2 Includes a start-up period of the second and subsequent trains to be significantly reduced by introducing part of the CO2 from the first operating train Into the other trains for start-up.
[0010] In other applications, such as for example a single train configuration or wIthout 002 compression, an additional external CO2 import source may be used In the present apparatus and process.
[0011] The introducfion of CO2 into the absorber before feed-in accelerates the cooling down for the process. This results in a significant reduction in the start-up duration of the Rectisol wash unit which provides for the two primary advantages of the present embodiments, i.e. (I) reduced emissions due to shorter periods o off-spec products, and (ii) increased production efficiency due to the shorter start-up tftne.
[0018] The present embodiments can be used where a temporary importation of CO2 is available, especially for multiple train arrangements with pressurized CO2 product, the introduction of 002 can be applied without significant cost impact to the existing faciUty and process.
[0019] It will be understood that the embodiments described herein are merely exemplary, and that one skilled in the art may make variations and modifications without departing from the spirit and scope of the invention, All such variations and modifications are intended to be induded within the scope of the invention as described herein. Further, aD embodiments disclosed are not necessarUy in the alternative, as various embodiments of the invention may be combined to provide the desired result.
Claims (2)
- CLAIMSWhat is claimed is: 1. A method of reducing start-up time for a gas stream separation process, comprising introducing carbon dioxide into the gas stream separation process before providing teed-In product to said process.
- 2. A system of reducing start-up time for gas stream separation, comprising: a gas stream separation apparatus including a feed-in assembly; and a source of carbon dioxide in fluid communication with the apparatus and adapted to provide said carbon dioxide before provlchng product feed-in. 5:
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361862169P | 2013-08-05 | 2013-08-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201321538D0 GB201321538D0 (en) | 2014-01-22 |
| GB2516994A true GB2516994A (en) | 2015-02-11 |
Family
ID=50000252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1321538.9A Withdrawn GB2516994A (en) | 2013-08-05 | 2013-12-06 | Introduction of CO2 for reduction of start-up time in a gas stream separation process |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2516994A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009015430A1 (en) * | 2007-08-01 | 2009-02-05 | Zerogen Pty Ltd | Power generation process and system |
| US20120329120A1 (en) * | 2008-12-01 | 2012-12-27 | Bekon Energy Technologies Gmbh & Co. Kg | Reducing Methane Slack When Starting and Stopping Biogas Fermenters |
-
2013
- 2013-12-06 GB GB1321538.9A patent/GB2516994A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009015430A1 (en) * | 2007-08-01 | 2009-02-05 | Zerogen Pty Ltd | Power generation process and system |
| US20120329120A1 (en) * | 2008-12-01 | 2012-12-27 | Bekon Energy Technologies Gmbh & Co. Kg | Reducing Methane Slack When Starting and Stopping Biogas Fermenters |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201321538D0 (en) | 2014-01-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |