CN104984631A - Tail gas depth deiodination method - Google Patents
Tail gas depth deiodination method Download PDFInfo
- Publication number
- CN104984631A CN104984631A CN201510462024.3A CN201510462024A CN104984631A CN 104984631 A CN104984631 A CN 104984631A CN 201510462024 A CN201510462024 A CN 201510462024A CN 104984631 A CN104984631 A CN 104984631A
- Authority
- CN
- China
- Prior art keywords
- membrane
- tail gas
- gas
- acetic acid
- tail
- 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.)
- Pending
Links
Abstract
The invention belongs to the field of gas purification, and relates to a tail gas depth deiodination method, and specifically relates to a high-pressure tail gas depth deiodination method in a chemical plant acetic acid production process. According to the method, a membrane with suitable pore sizes is chosen by using the characteristic that the molecular diameter of methyl iodide is far greater than that of other components, so that separation of methyl iodide from other components is well implemented. According to the method, the concentration of methyl iodide in the tail gas is reduced to below 1x10-9 (v/v) without changing existing process conditions.
Description
Technical field
The invention belongs to field of gas purification, relate to the method that tail-gas deep takes off iodine, be specifically related to chemical plant production of acetic acid process mesohigh tail-gas deep and take off iodine method.
Background technology
Acetic acid is a kind of broad-spectrum Organic chemical products, and global annual production is more than 10,000,000 tons.Although there will be a known several Processes for Producing Acetic Acid, since the later stage in last century, acetic acid synthesis from methanol carbonylation has become the main flow production method of acetic acid.It is reported, the acetic acid in the whole world more than 80% adopts methanol carbonylation to produce at present.The catalyst containing iodine to be used in methanol carbonylation, accessory substance iodomethane can be produced.For ensureing that product quality and production process are run continuously and stably, continuously will discharge two strands of tail gas in this production process, one is called high pressure exhaust gas, and another stock is low-pressure tail gas, and they all contain iodomethane.Toxic and the corrosivity of iodomethane, therefore, must carry out de-iodinate before exhaust emissions.In traditional technological design, tail gas or burning and exhausting, or directly discharge, iodomethane design concentration of emission is 1 × 10
-6-1 × 10
-4(v/v).Along with the continuous enhancing of the day by day harsh of environmental protection standard and energy-saving and cost-reducing consciousness, each manufacturer all considering the deep purifying of tail gas and recycling, has higher requirement to the concentration of emission of iodomethane.
Summary of the invention
For the problems referred to above, the object of the invention is that providing a kind of methanol carbonylation to produce tail-gas deep in acetic acid technique takes off iodine method, to realize circulation, the efficient iodine be separated in tail gas.
For realizing the object of the invention, technical scheme is as follows: the main component of producing tail gas in acetic acid technique due to methanol carbonylation is CO, H
2, N
2, CO
2, CH
4and CH
3i, the molecular diameter of iodomethane is 0.6nm, and other component is all less than 0.4nm, and the molecular diameter of iodomethane, much larger than other component, therefore, selects the film in suitable aperture can realize being separated of iodomethane and other component.
Concrete technical scheme is as follows: methanol carbonylation is produced the tail gas that acetic acid produces and pass into absorption tower, add methanol absorbing agent, through absorbing, absorbing liquid is discharged by bottom absorption tower, tail gas enters membrane separator by top, absorption tower, iodomethane is separated with other gas components, and the iodomethane after enrichment and tail gas merge to be introduced next round and circulate.Other component gas enters follow-up workshop section after purification.
Above-mentioned membrane material can be various inoranic membrane, organic film or composite membrane, and with the various UF membrane sub-assemblies that membrane material is made, membrane aperture between 0.35-0.6nm, preferably at 0.45-0.55nm.
The invention has the advantages that: utilize the molecular diameter of iodomethane much larger than other component, select the film in suitable aperture, achieve being separated of iodomethane and other component well.Do not change existing process conditions, iodomethane concentration in tail gas can be reduced to 1 × 10
-9(v/v).
Accompanying drawing explanation
Fig. 1 is present invention process flow chart.
Detailed description of the invention
for better illustrating the present invention, as follows for embodiment:
embodiment 1
The tail gas that certain factory's methanol carbonylation production acetic acid produces is passed into absorption tower, and add methanol absorbing agent, take off the high pressure exhaust gas after iodine through methanol absorption, it forms (v/v): CO 77.0, H
214.0, N
23.4, CO
23.4, CH
3oH 1.0, CH
41.0, containing iodomethane 1.2 × 10
-6(v/v), it is entered membrane separator by top, absorption tower, iodomethane is separated with other component gas, and the iodomethane after enrichment and tail gas merge to be introduced next round and circulate.After UF membrane, iodomethane concentration is lower than 1 × 10
-9(v/v).
Membrane separator membrane material used selects organic film, and membrane aperture is at 0.45-0.55nm.
Claims (2)
1. in a methanol carbonylation production acetic acid technique, tail-gas deep takes off iodine method, it is characterized in that, realize by the following method: methanol carbonylation is produced the tail gas that acetic acid produces and pass into absorption tower, add methanol absorbing agent, through absorbing, absorbing liquid is discharged by bottom absorption tower, tail gas enters membrane separator by top, absorption tower, iodomethane is separated with other gas components, and the iodomethane after enrichment and tail gas merge to be introduced next round and circulate, and other component gas enters follow-up workshop section after purification;
The various UF membrane sub-assemblies that described membrane material selects inoranic membrane, organic film, composite membrane or makes with membrane material, membrane aperture is between 0.35-0.6nm.
2. in methanol carbonylation production acetic acid technique as claimed in claim 1, tail-gas deep takes off iodine method, and it is characterized in that, membrane aperture is at 0.45-0.55nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510462024.3A CN104984631A (en) | 2015-07-31 | 2015-07-31 | Tail gas depth deiodination method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510462024.3A CN104984631A (en) | 2015-07-31 | 2015-07-31 | Tail gas depth deiodination method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104984631A true CN104984631A (en) | 2015-10-21 |
Family
ID=54296596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510462024.3A Pending CN104984631A (en) | 2015-07-31 | 2015-07-31 | Tail gas depth deiodination method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104984631A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0977697A (en) * | 1995-09-18 | 1997-03-25 | Daicel Chem Ind Ltd | Separation of acetaldehyde and methyl iodide |
| CN1465523A (en) * | 2002-07-02 | 2004-01-07 | 鹰 杨 | Method for refining mixed gas at least containing carbon monoxide, carbon dioxide, nitrogen and hydrogen |
| CN1520920A (en) * | 2003-01-30 | 2004-08-18 | 西南化工研究设计院 | Technique for recovering useful constituent from the tail gas arising from acetic acid synthesis process from carbonyl |
| CN101439256A (en) * | 2008-11-14 | 2009-05-27 | 江苏索普（集团）有限公司 | Film method for recycling CO in high-pressure exhaust from production of acetic acid by carbonylation |
-
2015
- 2015-07-31 CN CN201510462024.3A patent/CN104984631A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0977697A (en) * | 1995-09-18 | 1997-03-25 | Daicel Chem Ind Ltd | Separation of acetaldehyde and methyl iodide |
| CN1465523A (en) * | 2002-07-02 | 2004-01-07 | 鹰 杨 | Method for refining mixed gas at least containing carbon monoxide, carbon dioxide, nitrogen and hydrogen |
| CN1520920A (en) * | 2003-01-30 | 2004-08-18 | 西南化工研究设计院 | Technique for recovering useful constituent from the tail gas arising from acetic acid synthesis process from carbonyl |
| CN101439256A (en) * | 2008-11-14 | 2009-05-27 | 江苏索普（集团）有限公司 | Film method for recycling CO in high-pressure exhaust from production of acetic acid by carbonylation |
Non-Patent Citations (1)
| Title |
|---|
| 张嫦 等: "《精细化工工艺原理与技术》", 31 October 2005, 四川出版集团·四川科学技术出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207745676U (en) | The recovery and processing system of technique of trichlorosilane synthetic tail gas | |
| WO2015105438A1 (en) | Apparatus comprising a membrane unit and a water scrubber unit for removing carbon dioxide from a gas | |
| CN103551018B (en) | A kind of sulfur-containing tail gas purifies and recoverying and utilizing method | |
| EA023203B1 (en) | Process and apparatus for separation of gases | |
| RU2009131715A (en) | METHODS FOR PRODUCING ETHYLENE OXIDE AND ETHYLENE GLYCOL | |
| ATE532574T1 (en) | METHOD AND PLANT FOR PURIFYING BIOGAS TO PRODUCE METHANE | |
| CN104495752B (en) | A kind of method and system using membrance separation and pressure-variable adsorption Combined Treatment refinery gas | |
| CN108339377B (en) | From containing CO2Separation of CO from gas streams2Method and membrane separation system | |
| CN104310692B (en) | The processing method of glyphosate mother solution | |
| WO2011009437A3 (en) | Method and plant for the production of methanol | |
| CN103752129A (en) | Device and process for separating and recycling non-methane total hydrocarbons and hydrogen gas from refinery dry gas | |
| RU2015142611A (en) | METHOD FOR CARBONILATION OF DIMETHYL ETHER | |
| CN102816045A (en) | Method for synthesizing chloromethane by tail gas generated during chloroacetic acid production | |
| CN104152203A (en) | Method for purifying and preparing high-purity biomass methane by using biogas slurry | |
| US9028682B2 (en) | System and method for H2S removal integrated with stinson process CO2 removal | |
| CN104016310B (en) | A kind of ammonia synthesizing industry waste gas selectivity produces the method for sodium sulphite or Sodium sulfhydrate | |
| Alshehri et al. | Membrane systems engineering for post-combustion carbon capture | |
| CN105413429A (en) | Method for separating and purifying lime kiln tail gas | |
| CN109319736B (en) | Ammonia tank purge gas recovery device and process thereof | |
| CN102161925A (en) | Process for producing biological natural gas by using methane | |
| CN104984631A (en) | Tail gas depth deiodination method | |
| CN104003832A (en) | System and technique for simultaneously purifying methane and carbon dioxide from marsh gas | |
| CN204933200U (en) | A kind of tail-gas deep takes off iodine device | |
| CN217188769U (en) | Device for collecting carbon dioxide in flue gas | |
| CN109956524B (en) | Method and system for separating multivalent ions in wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151021 |
|
| WD01 | Invention patent application deemed withdrawn after publication |