CN102489095A - Method for purifying melamine tail gas - Google Patents
Method for purifying melamine tail gas Download PDFInfo
- Publication number
- CN102489095A CN102489095A CN2011103589368A CN201110358936A CN102489095A CN 102489095 A CN102489095 A CN 102489095A CN 2011103589368 A CN2011103589368 A CN 2011103589368A CN 201110358936 A CN201110358936 A CN 201110358936A CN 102489095 A CN102489095 A CN 102489095A
- Authority
- CN
- China
- Prior art keywords
- tail gas
- washing
- tower
- melamine
- gas
- 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
Images
Landscapes
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a method for purifying melamine tail gas. The tail gas from a melamine system is guided into an inertia fluid washing tower and is fully contacted with the inertia fluid from the top of the tower on a multi-layer plate arranged in the tower; a small amount of mist washing liquor in washed tail gas in a separator is removed, the tail gas is delivered to a compressor to be pressurized to a required pressure for production and then enters a production system; washing liquor finishing washing tail gas in the washing tower enters the lower part of the washing tower and is regenerated through the settling and separation functions of the lower part, the separated impurities are discharged from the lower part, and the above steps are performed circularly. The method has the advantages that gas and liquor are contacted fully, and the gas purifying rate is high, the compressor can not be crusted and blocked, and the equipment cleaning frequency and emergency shutdown can be reduced.
Description
Technical field
The present invention relates to the purification techniques of tail gas in a kind of Chemical Manufacture, relate in particular to a kind of purification method of melamine tail gas.
Background technology
At present, the basic principle that melamine enterprise in home and abroad makes melamine is: under certain pressure and the temperature conditions, make urea accomplish polycondensation reaction and generate melamine, simultaneously ton product by-product 2000NM
3About, NH
3With CO
2Volume ratio be 2/1 tail gas; Domestic two-step method and its tail gas pressure of gas phase quenching one-step method producing technology are all below 0.3MPa; According to the resource and the coproduction condition of each producer, this tail gas is used to produce products such as ammoniacal liquor, liquefied ammonia, carbonic hydroammonium, ammonium nitrate, urea, ammonium chloride and composite fertilizer.
When above-mentioned some product of coproduction,, need compressor that it is carried to a certain pressure and could satisfy working condition because tail gas pressure is lower.Owing to carry impurity such as a small amount of melamine, silica white, vaporific liquid urine secretly in the tail gas; Make tail gas in pressure process, cause positions such as valve, cylinder body, fin phenomenons such as skinning, obstruction to occur; The cleaning that need often stop production, the safe and stable operation that influence is produced.The utilization to this tail gas is directly to get into compressor or production system in the industry at present, this tail gas is not carried out purified treatment.
If mechanical filter unit is set before tail-gas compressor, often investment is bigger, and temperature is high, and the sludge thing should not clean and regenerate.
Summary of the invention
The purification method that the purpose of this invention is to provide a kind of melamine tail gas; Be that the inert fluid scrubbing tower is set before the melamine tail gas compressor; Utilize the viscosity of liquid and wrap up in the band effect; Contact fully through gas-liquid, the liquid in the tail gas, solid shape impurity capture are got off, and then utilize different liquid layering, solid sedimentation, the clear liquid at the bottom of tower, realized of its proportion to separate.Inertia washing lotion after the separation regeneration recycles.
The objective of the invention is to realize through following technical scheme; Tail gas from the melamine system imports the inert fluid scrubbing tower; On the multilayer column plate that in tower, is provided with; Fully contact with the inert liquid that cat head gets off, the tail gas that is washed send compressor pressurizes after producing required pressure, to get into production system after in separator, removing a small amount of vaporific washing lotion; The washing lotion of accomplishing the gas washing task in the scrubbing tower gets into the Xi Ta bottom, and the sedimentation, the separation function that are provided with through the bottom make cleaning solution obtain regeneration, and the impurity that is separated is discharged from the bottom, and so circulation is carried out.
Said indifferent gas cleaning solution is one or more of paraffin oil, atoleine, bio oil, conduction oil.
Beneficial effect of the present invention:
1, owing to gas, liquid fully contact, gas purification coefficiency is high, even the denier entrainment is arranged, because the lubrication of inert liquid can not cause compressor skinning and obstruction yet.Can effectively reduce equipment cleaning number of times and disastershutdown.
2, owing to the inertia characteristics of cleaning solution, scrubbing tower, separator, lotion pumps, pipeline, valve etc. are less demanding to equipment material, can guarantee that washing process has a less investment.
3, the denier washing lotion mist of being carried secretly behind the washing tail gas plays antisepsis to overcurrent pipeline, equipment, washings such as first ammonium liquid capable of using or ammonium fluid, separation, recovery when arriving lower procedure.
Description of drawings
Fig. 1 is a process chart of the present invention
The specific embodiment
As shown in Figure 1, melamine tail gas gets into inert fluid scrubbing tower bottom at 0.31MPa about 140 ℃; On the multilayer column plate that in tower, is provided with, fully contact, the tail gas that is washed is removed a small amount of vaporific washing lotion in separator after with the inert liquid that cat head gets off; At 0.3MPa; Under 140 ℃ of conditions, send into the suction port of compressor, after producing required pressure, get into production system through compressor pressurizes.
After washing lotion gets into the Xi Ta bottom; The sedimentation, the separation function that are provided with through the bottom make cleaning solution obtain regeneration; From discharging, clear liquid adds through washing pump and is pressed in 0.35MPa impurity, gets into inert fluid scrubbing tower top under 140 ℃ of conditions and accomplishes washing, separation to melamine tail gas from the lower part.
Claims (2)
1. the purification method of a melamine tail gas; It is characterized in that importing the inert liquid scrubbing tower from the tail gas of melamine system; On the multilayer column plate that in tower, is provided with; Fully contact with the inert fluid that cat head gets off, the tail gas that is washed send compressor pressurizes after producing required pressure, to get into production system after in separator, removing a small amount of vaporific washing lotion; The washing lotion of accomplishing the gas washing task in the scrubbing tower gets into the Xi Ta bottom, and the sedimentation, the separation function that are provided with through the bottom make cleaning solution obtain regeneration, and the impurity that is separated is discharged from the bottom, and so circulation is carried out.
2. the purification method of a kind of melamine tail gas according to claim 1 is characterized in that said inertia cleaning solution is one or more of paraffin oil, atoleine, bio oil, conduction oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103589368A CN102489095A (en) | 2011-10-27 | 2011-10-27 | Method for purifying melamine tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103589368A CN102489095A (en) | 2011-10-27 | 2011-10-27 | Method for purifying melamine tail gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102489095A true CN102489095A (en) | 2012-06-13 |
Family
ID=46180980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103589368A Pending CN102489095A (en) | 2011-10-27 | 2011-10-27 | Method for purifying melamine tail gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102489095A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107827896A (en) * | 2017-11-24 | 2018-03-23 | 阳煤丰喜肥业（集团）有限责任公司 | A kind of process and equipment of melamine tail gas coproduction hexa |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2330404Y (en) * | 1998-02-24 | 1999-07-28 | 蒋大洲 | Melamine-urea washing and gas-liquid separation combined equipment |
| WO2000032566A1 (en) * | 1998-12-03 | 2000-06-08 | Agrolinz Melamin Gmbh | Method of introducing melamine off-gases into a urea plant |
| CN101973948A (en) * | 2010-09-11 | 2011-02-16 | 山东省舜天化工集团有限公司 | Method for producing melamine |
| CN102125796A (en) * | 2011-02-15 | 2011-07-20 | 江苏南大光电材料股份有限公司 | Leaching tower device for treatment of tail gas from production of MO (metal organic) source |
-
2011
- 2011-10-27 CN CN2011103589368A patent/CN102489095A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2330404Y (en) * | 1998-02-24 | 1999-07-28 | 蒋大洲 | Melamine-urea washing and gas-liquid separation combined equipment |
| WO2000032566A1 (en) * | 1998-12-03 | 2000-06-08 | Agrolinz Melamin Gmbh | Method of introducing melamine off-gases into a urea plant |
| CN1329591A (en) * | 1998-12-03 | 2002-01-02 | 阿格罗林茨蜜胺有限公司 | Method of introducing melamine off-gases into urea plant |
| CN101973948A (en) * | 2010-09-11 | 2011-02-16 | 山东省舜天化工集团有限公司 | Method for producing melamine |
| CN102125796A (en) * | 2011-02-15 | 2011-07-20 | 江苏南大光电材料股份有限公司 | Leaching tower device for treatment of tail gas from production of MO (metal organic) source |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107827896A (en) * | 2017-11-24 | 2018-03-23 | 阳煤丰喜肥业（集团）有限责任公司 | A kind of process and equipment of melamine tail gas coproduction hexa |
| CN107827896B (en) * | 2017-11-24 | 2024-01-19 | 阳煤丰喜肥业（集团）有限责任公司 | Process method and equipment for co-producing hexamethylenetetramine by using melamine tail gas |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103908868B (en) | Remove the method for styrene and recover hydrogen in ethylbenzene dehydrogenation tail gas | |
| CN204237558U (en) | The after-treatment device of hydrogen peroxide obtained by anthraquinone process production technique | |
| CN106479578B (en) | A kind of acid gas removal technique of mating coal gasification | |
| CN109160490B (en) | Oxygen production equipment | |
| WO2010120527A3 (en) | Process for co2 capture with improved stripper performance | |
| CN110330136A (en) | Acid pickle regenerates preprocess method and system | |
| CN103831003A (en) | Regenerated tail gas purification combined tower | |
| CN102009957A (en) | Method for purifying high-yield superclean high-purity hydrofluoric acid | |
| CN102489095A (en) | Method for purifying melamine tail gas | |
| CN103695043A (en) | Method for drying, purifying and cooling conversion rough synthesized gas and SNG product gas through low-temperature methanol washing and device thereof | |
| CN104927951A (en) | Decarbonization and dehydration process for natural gas | |
| CN102371144B (en) | Desulfurizing agent used for benzene | |
| CN103623605A (en) | Pretreatment method for rectifying and recovering dimethyl formamide (DMF) waste liquid of polyurethane (PU) synthetic leather | |
| CN101475168B (en) | Method for washing active carbon | |
| CN102502499B (en) | Preparation process for super-clean high-purity hydrochloric acid | |
| CN204848980U (en) | Field of force purifier that zinc sulphate solution is overweight | |
| CN103663792A (en) | Nylon recycling extraction water filtering system and process | |
| CN103754833B (en) | A kind of device and method utilizing oil refinery dry gas to produce Sodium sulfhydrate | |
| CN203754661U (en) | Pretreatment device for producing natural gas from coke oven gas | |
| CN101318877B (en) | Process for recycling chloromethane generated in cartap production process | |
| CN210711430U (en) | Raw coke oven gas pretreatment system | |
| CN107684929B (en) | Method for improving performance of benzene hydrogenation homogeneous catalyst | |
| CN105002374A (en) | Zinc sulfate solution super-gravity field purification device | |
| CN204714648U (en) | A kind of dregs of beans leaches workshop washing water filtration unit | |
| CN203853009U (en) | Regenerated tail gas purifying combination tower |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120613 |