CN105001051B - The processing method of tail gas it is centrifuged based on the carboxymethyl cellulose containing ethanol being thermally integrated - Google Patents
The processing method of tail gas it is centrifuged based on the carboxymethyl cellulose containing ethanol being thermally integrated Download PDFInfo
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Abstract
The present invention proposes the processing method being centrifuged tail gas based on the carboxymethyl cellulose containing ethanol being thermally integrated, can effectively catch the ethanol that carboxymethyl cellulose is centrifuged in tail gas, reduce the harm to environment, go back the ethanol that recoverable carboxymethyl cellulose is centrifuged in tail gas simultaneously, there is double benefit economical and environmentally friendly.The technical scheme is that by air-introduced machine, carboxymethyl cellulose being centrifuged tail gas is incorporated in seizure equipment, the agent for capturing formed with ionic liquid and water is fully contacted, form the agent for capturing solution containing ethanol, agent for capturing solution containing ethanol is through separating, the agent for capturing reusable edible obtained, ethanol can be reused for production process, uses the method that the catch rate of ethanol is reached more than 99.3%, and purity of alcohol reaches more than 99.5%.The present invention has and economizes on resources, protects advantage that environment, energy consumption are low it can also be used to the process of organic exhaust gas during other chemical industry, pharmaceutical manufacturing.
Description
Technical field
The invention belongs to clean chemical production field, be specifically related to a kind of based on being thermally integrated use ionic liquid and water work
Catch for agent for capturing, recovery carboxymethyl cellulose is centrifuged the method for ethanol in tail gas.
Background technology
Ionic liquid by specific organic cation and organic or inorganic anion form under room temperature or nearly room temperature
The molten salt system being in a liquid state, has good heat stability and chemical stability, vapour pressure extremely low, the most volatile, toxicity is the lowest,
The advantages such as structure can design, are the novel green mediums of a class.In recent years, ionic liquid is used to catch the research of gas increasingly
It is subject to people's attention.
Carboxymethyl cellulose is a kind of by the chemically modified a kind of anionic macromolecule chemical combination obtained of native cellulose
Thing, is widely used in the industry such as oil, food, medicine, weaving, papermaking.In recent years, sending out rapidly along with national economy
Exhibition, the demand of carboxymethyl cellulose the most constantly increases.And due to the performance of its excellence and valuable collochemistry character, also
Constantly opening up new application, market prospect is the most wide, has a high potential.
The production technology of carboxymethyl cellulose has hydrophily method and solvent method two kinds.Hydrophily method using water as reaction medium, but
Products obtained therefrom salinity is big, and moisture is high, in alkalescence, is low and middle-grade carboxymethyl cellulose products.And solvent method is made with organic solvent
For reaction medium, eliminate the caustic dip that hydrophily method is intrinsic, squeezing, to pulverize, the operation such as aging, alkalization, etherificate is all in kneader
Carry out.Course of reaction heat transfer, mass transfer are rapidly, uniform, stable, primary response is fast, side reaction is few, gained carboxymethyl cellulose product
Homogeneity, transparency and solubility property are all fine, are the directions of whole cellulose ether industry development.Therefore, the biggest
Most producers all use solvent method, but solvent method is using expensive organic solvent as reaction medium, and cost is relatively big, and in carboxylic first
Base cellulose is centrifuged in tail gas and is directly discharged in air containing substantial amounts of ethanol, and this not only pollutes environment, too increases production
Cost.
During solvent method produces carboxymethyl cellulose, sodium hydroxide and ethanol equal proportion join in retort mixed
Close, owing to blower fan runs during charging always, cause a large amount of ethanol to enter air.Sodium hydroxide and ethanol mixing are completely
After, add starch, drip monoxone after a period of time again, after waiting them fully to react, obtain feed liquid.Then feed liquid be passed through from
Scheming is centrifuged, and the solid material after a centrifuge, after a large amount of methanol wash, enters secondary centrifuging machine and is centrifuged, be centrifuged
Journey produces a large amount of waste gas containing ethanol and is directly discharged in air.Slatterning substantial amounts of ethanol in this process, this not only increases
Certain cost, and return ambient atmosphere environment.Through measuring and calculating, often produce 1 ton of carboxymethyl cellulose loss second
Alcohol 300 to 400 kilograms, will result in huge economic loss every year.Therefore develop the processing method of reasonable, administer this stock and give up
Gas, both can protect the atmospheric environment of surrounding, can produce again considerable economic benefit.
The most general method used that processes of organic exhaust gas has conversion method and absorption method, and conversion method has thermal oxide, catalysis
The technology such as burning, biological oxidation, mainly by chemistry or biochemical reaction, turn Organic substance with heat, catalyst and microorganism etc.
It is turned into carbon dioxide and water.Absorption method mainly has absorption method, condensation method, absorption process and membrane separation process, by physical method, profit
Separating and recovering organic solvent with temperature, selective absorber and permoselective membrane etc., it is to use either physically or chemically
Organic substance in waste gas is reclaimed and is used again.Although conversion method decreases the pollution of organic exhaust gas, but waste resource and
Energy, and a large amount of greenhouse gases can be discharged.Absorption method can produce secondary solid or liquid pollutant.Condensation method investment is relatively big,
Requiring higher to environment and operator, and energy consumption is excessive, operating cost is high.Membrane separation process is higher to the requirement of film, processes
Organic exhaust gas high performance membrane of good performance has to be developed, and range of application is restricted.Among absorption process, absorbent properties excellent
Bad, it is one of key factor determining absorption operation effect quality, the present invention uses agent for capturing absorption process to process organic exhaust gas, can
Catching low-concentration organic exhaust gas, capturing efficiency is high, pollution-free, agent for capturing also reusable edible.
Prior art also discloses that the method using ionic liquid absorption agent to absorb organic exhaust gas, such as Publication No.
The patent of CN102675028A is directed to use with ionic liquid and processes the technique of acetylene cracking gas, and it provides a kind of with relatively strong basicity
Ionic liquid or the mixed solvent of ionic liquid and organic solvent composition be absorbent, the high-purity second of isolated from cracking gas
The method of alkynes, but its method using absorption-desorbing, high pressure absorbs cracking gas successively, carries out segmentation and subtract after absorbing liquid preheating
Pressure, intensification desorbing, desorb light component, acetylene and high alkynes, the highly purified acetylene of isolated, but this technological operation be relatively
For complexity, operating cost is high.
The patent of Publication No. CN102190557A relates to the technique of ionic liquid acetone and methanol, and it provides one
Planting the composite extractant separated for acetone methanol azeotrope, be made up of main extractant and additive, main extractant is water,
Additive is valency cation salt, complex salt or ionic liquid.But material concentration is required higher by it, the final acetone response rate
About 85%, the response rate is the highest.
It is compound that the patent of Publication No. CN103073388A discloses a kind of mixture with ionic liquid and inorganic salt
The method of extractant separating alcohol-water, but the method introduces inorganic salt, is corrosive process units.
The application uses ionic liquid and water to realize effective seizure of the ethanol in tail gas, reduces the discharge of organic exhaust gas,
Realize cleaning Chemical Manufacture.The application is that the problem that etoh solvent unit consumption is big is special in carboxymethyl cellulose production process
Research and development, effect is notable, has broad application prospects.The method of the present invention uses green solvent ionic liquid and water as catching
Catch agent, nontoxic, corrosion-free, pollution-free, easily reclaim, Heat stability is good and chemical stability are good, lossless, can be recycled, right
Material concentration require low, the present invention use ionic liquid include benzothiazoles ionic liquid, benzimidazole ionic liquid,
Quinolines ionic liquid.Heat unnecessary in technique, by being thermally integrated, is made full use of, it is achieved being greatly reduced of energy consumption by the present invention
And it is greatly improved the capturing ability of agent for capturing.The method treating capacity that the present invention provides is big, simple to operate, good in economic efficiency, right
The catch rate of ethanol and the response rate all reach more than 99.3%, and purity of alcohol reaches more than 99.5%.
Summary of the invention
The application proposes a kind of based on being thermally integrated and use ionic liquid and water seizure carboxymethyl cellulose to be centrifuged in tail gas
The method of ethanol, ethanol described herein is the alcohol gas that carboxymethyl cellulose is centrifuged in tail gas.Described method
The ethanol that carboxymethyl cellulose is centrifuged in tail gas can be caught efficiently, reduce the discharge of organic exhaust gas, and ethanol can be realized
Recycle, there is double benefit economical and environmentally friendly.
[solving the technical problem that]
It is an object of the invention to provide the processing method being centrifuged tail gas based on the carboxymethyl cellulose containing ethanol being thermally integrated.
[technical scheme]
The application is achieved by the following technical solution:
The processing method of tail gas it is centrifuged based on the carboxymethyl cellulose containing ethanol being thermally integrated, it is characterised in that: described side
Method uses following device that carboxymethyl cellulose is centrifuged ethanol in tail gas and recycles, and this device includes air filter
2., catch tower 3., heat exchanger 6., agent for capturing regenerator 7.；The outlet 2. of wherein said air filter is with described seizure tower 3.
Air inlet be connected, discharging opening at the bottom of discharging opening at the bottom of described seizure tower tower 3. and described agent for capturing regenerator tower 7. respectively with
The cold and hot fluid import 6. of described heat exchanger is connected, described seizure tower tower top charging aperture 3. and described agent for capturing regenerator
7. charging aperture is connected with heat exchanger heat 6., cold fluid outlet respectively；
This recovery and treatment method comprises the steps:
1) carboxymethyl cellulose containing ethanol is centrifuged tail gas and initially enters air filter 2., at air filter 2. middle carboxylic
Methylcellulose dust and some solid particles are through centrifugal and compress precipitated to get off；
2) by air filter carboxymethyl cellulose 2. be centrifuged tail gas from tower bottom enter into seizure tower 3., be caught
Catching agent to catch, form the agent for capturing solution containing ethanol 4., the air after purification is discharged from catching tower 3. top；
3) by step 2) in be 4. incorporated into heat exchanger containing the agent for capturing solution of ethanol and 6. carry out being thermally integrated rear temperature and rise to 70-
80 DEG C, be sent to agent for capturing regenerator 7. in, agent for capturing regenerator 7. tower bottom reboiler can be saved per hour and add vapours 250-
300kg, obtains high-quality ethanol from tower topThe agent for capturing being recycled at the bottom of tower is 8.；
4) by step 3) in the agent for capturing that reclaims 8. 6. carry out being thermally integrated rear temperature be down to 35-45 DEG C by heat exchanger, from
Top is passed through seizure tower 3. to recycle；
5) agent for capturing regenerator 7. in through rectification separate, obtain high-quality ethanol at tower topBack into production car
Between be reused for the production of carboxymethyl cellulose.
A preferred embodiment of the invention, it is characterised in that agent for capturing is the mixture of ionic liquid and water.
A preferred embodiment of the invention, it is characterised in that ionic liquid be benzothiazoles ionic liquid,
Benzimidazole ionic liquid, the mixture of one or more of quinolines ionic liquid.
A preferred embodiment of the invention, it is characterised in that: 6. described heat exchanger is single tube Cheng Dan shell side
Tubular heat exchanger, its heating source be the agent for capturing 7. reclaimed from agent for capturing regenerator 8..
A preferred embodiment of the invention, it is characterised in that the catch rate of ethanol is reached by described agent for capturing
More than 99.3%.
A preferred embodiment of the invention, it is characterised in that the purity of alcohol after described recovery reaches 99.5%
Above.
A preferred embodiment of the invention, it is characterised in that in the air after described purification, the content of ethanol is low
In 100ppm.
Catch tower 3. in, tower top pressure maintains about 1atm, and carboxymethyl cellulose is centrifuged that tail gas is continuous and agent for capturing
Carry out gas-to-liquid contact, alcohol gas therein be constantly captured agent catch, the tail gas after purification from tower top be vented, and agent for capturing from
Sub-liquid and water, due to non-volatile, will carry ethanol and be left by the bottom of tower under gravity, form the agent for capturing containing ethanol molten
Liquid is 4..
The know-why of the present invention is: ionic liquid and water spray from catching column overhead as agent for capturing, at the bottom of tower
Carboxymethyl cellulose be centrifuged tail gas and inversely contact, produce stable froth bed, form a rapids when froth bed reaches balance
Dynamic froth zone, at this moment gas-liquid two-phase not only contact area is big, and contact surface is continuously available renewal, and liquid phase is at multi-stage column
On plate, fierce collision is so that gas-liquid is sufficiently mixed, and ethanol is captured and then along with the action of gravity of liquid falls in seizure tower.Second
During alcohol is dissolved in agent for capturing, alcohol both can form hydrogen bond by the cation of hydrogen bond alkalescence with ionic liquid, the most permissible
Forming hydrogen bond by hydrogen bond is acid with anion, hydrone then tends to preferential and ionic liquid anion and forms hydrogen bond.
Therefore, water and alcohol can form different hydrogen bond actions from ionic liquid, and ethanol dissolves each other with ion liquid section, but due to water
Existence, the dissolubility that water and ethanol are increased in ionic liquid by synergism.Hydrogen is passed through between this water and ethanol
Specific structure and the field of force that key interacts and formed make can to dissolve each other completely between ionic liquid and water, ethanol, reach
Good seizure effect.Finally make the content of ethanol in purification air be reduced to below 100ppm, and the catch rate of ethanol is reached
More than 99.3%.Agent for capturing regenerator 7. in through rectification separate, agent for capturing recycle, the purity finally giving ethanol exists
More than 99.5%, and the response rate of ethanol is more than 99.3%.The temperature of agent for capturing has considerable influence, temperature to its capturing ability
The highest capturing ability is the poorest, and it is the highest to enter the agent for capturing regenerator 4. temperature containing ethanol agent for capturing 7., and agent for capturing regenerator is 7.
Steam consumption needed for tower bottom reboiler heating is the fewest, by by relatively low for temperature 4. higher with temperature containing ethanol agent for capturing
8. the agent for capturing reclaimed is thermally integrated, and raises containing ethanol agent for capturing 4. temperature, and the agent for capturing of recovery 8. temperature reduces, and i.e. saves
The heating steam consumption of tower 7. reboiler, improve again agent for capturing catch tower 3. in capturing ability.
2 towers used in this application: catch tower, agent for capturing regenerator.Seizure tower is plate column, and number of theoretical plate is 25-42,
Tower top temperature is 15-32 DEG C, and operation pressure is 1-2atm, and tail gas feeding temperature is 20-45 DEG C, and agent for capturing feeding temperature is 35-
45℃.Agent for capturing regenerator is plate column, and number of theoretical plate is 25-40, and tower top temperature is 75-85 DEG C, and column bottom temperature is at 90-105
DEG C, feed entrance point is 5-20, and operation pressure is 1-2atm, and reflux ratio is 1-5.
Ionic liquid of the present invention is benzothiazoles ionic liquid, benzimidazole ionic liquid, quinolines
Ionic liquid, including benzothiazole tetrafluoroborate, benzothiazole substituted sulfonic acid salt, N-alkyl benzothiazole hexafluorophosphate,
The double methyl fluoride sulfimide of 1-butyl-3-tolimidazole, butyl isoquinolin bis trifluoromethyl sulfimide, butyl quinoline are double
Trifluoromethanesulp-onyl-onyl imide, hexyl quinoline bis trifluoromethyl sulfimide.These ionic liquids are the most volatile as agent for capturing, catch
Catching effective, selectivity is high, easily separated recovery.Described ionic liquid all can be commercially available.
[beneficial effect]
There is advantages that
(1) present invention provides a kind of totle drilling cost low, the high and good in economic efficiency seizure carboxymethyl cellulose of capturing efficiency from
The method of ethanol in heart tail gas；
(2) present invention uses ionic liquid and water as agent for capturing, and ionic liquid vapour pressure is extremely low, will not produce because of volatilization
Raw problem of environmental pollution, can reduce the injury to operator；
(3) present invention uses ionic liquid and water to catch, as agent for capturing, the ethanol that carboxymethyl cellulose is centrifuged in tail gas,
Agent for capturing has good dissolubility to ethanol, and capture-process can be made to carry out under homogeneous phase condition, can reduce equipment volume simultaneously,
The investment cost of saving equipment；
(4) agent for capturing used by the present invention has good heat stability and chemical stability, and the agent for capturing containing ethanol is molten
The easily separated recovery of liquid, ethanol and agent for capturing can recycle, non-secondary pollution problem；
(5) present invention is by from returning of obtaining at the bottom of the agent for capturing containing ethanol obtained at the bottom of seizure tower tower with agent for capturing regenerator tower
The agent for capturing received carries out heat exchange, enhances the capturing ability of the agent for capturing of recovery, saves agent for capturing regenerator tower bottom reboiler
Heating steam consumption, decreases production cost and investment cost.
(6) during the method for the present invention finally makes purification air, the content of ethanol is reduced to below 100ppm, catches ethanol
The rate of catching reaches more than 99.3%, and the purity of alcohol finally given is more than 99.5%, and the response rate of ethanol is more than 99.3%.
Accompanying drawing explanation
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the flow chart of the present invention.The most 1. it is centrifuged tail gas for the carboxymethyl cellulose containing ethanol, 2. for air filtration
Device, 3. for catching tower, is 4. the agent for capturing solution containing ethanol, is 5., 9. circulating pump, be 6. heat exchanger, 7. regenerate for agent for capturing
Tower, 8. for the agent for capturing reclaimed, 10. for the purification air of emptying,For high-quality ethanol solution.
Detailed description of the invention
Further illustrate below in conjunction with accompanying drawing, and unrestricted scope involved in the present invention.
Seeing shown in accompanying drawing 1, the carboxymethyl cellulose containing ethanol is centrifuged tail gas and 1. 2. compresses filtration through air filter
After enter into seizure tower 3., catch tower 3. in ethanol be captured, purify air 10. enter in air.Agent for capturing containing ethanol is molten
5. 4. liquid enter into heat exchanger 6. heat exchange by circulating pump, then go through agent for capturing regenerator 7. in, at agent for capturing regenerator
7. in through separation, the agent for capturing of recovery 8. after 9. circulating pump is sent to heat exchanger 6. heat exchange, be sent to catch tower 3. in
Recycling, agent for capturing regenerator tower top obtains high-quality ethanol
In the present invention, the definition of catch rate and the response rate is:
Embodiment 1
Carboxymethyl cellulose is centrifuged tail gas flow velocity 11970kg/h, and percent mass forms: ethanol 0.7%, other gases
99.3%, temperature is 40 DEG C, and agent for capturing is the mixture of benzothiazole tetrafluoroborate and water, and its percent mass consists of: benzene
And thiazole tetrafluoroborate 80%, water 20%, its flow velocity is 2500kg/h, and temperature is 35 DEG C, and catching tower is 25 blocks of plates, and normal pressure is grasped
Making, seizure tower is plate column, and the catch rate of ethanol is 99.57%.Agent for capturing regenerator is plate column, and number of theoretical plate is 30 pieces,
Atmospheric operation, reflux ratio is 2, and feed entrance point is the 11st block of plate.The purity of ethanol is 99.5%, the response rate is 99.3%.Reclaim
Agent for capturing and the agent for capturing containing ethanol in heat exchanger after heat exchange, the agent for capturing temperature of recovery is 35 DEG C, containing ethanol agent for capturing temperature
Degree is 80 DEG C, saves reboiler per hour and add vapours 300kg after entering agent for capturing regenerator containing ethanol agent for capturing.
Embodiment 2
Carboxymethyl cellulose is centrifuged tail gas flow velocity 12362kg/h, and percent mass forms: ethanol 0.6%, other gases
99.4%, temperature is 41 DEG C, and agent for capturing is benzothiazole substituted sulfonic acid salt and the mixture of water, and its percent mass consists of: benzene
And thiazole substituted sulfonic acid salt 75%, water 25%, its flow velocity is 2300kg/h, and temperature is 45 DEG C, and catching tower is 34 blocks of plates, and normal pressure is grasped
Making, seizure tower is plate column, and the catch rate of ethanol is 99.73%.Agent for capturing regenerator is plate column, and number of theoretical plate is 33 pieces,
Atmospheric operation, reflux ratio is 3, and feed entrance point is the 15th block of plate.The purity of ethanol is 99.81%, the response rate is 99.68%.Return
The agent for capturing received and the agent for capturing containing ethanol are in heat exchanger after heat exchange, and the agent for capturing temperature of recovery is 45 DEG C, containing ethanol agent for capturing
Temperature is 70 DEG C, saves reboiler per hour and add vapours 250kg after entering agent for capturing regenerator containing ethanol agent for capturing.
Embodiment 3
Carboxymethyl cellulose is centrifuged tail gas flow velocity 11850kg/h, and percent mass forms: ethanol 0.9%, other gases
99.1%, temperature is 39 DEG C, and agent for capturing is N-alkyl benzothiazole hexafluorophosphate and the mixture of water, and its percent mass forms
For: N-alkyl benzothiazole hexafluorophosphate 83%, water 17%, its flow velocity is 2720kg/h, and temperature is 38 DEG C, and catching tower is 27
Block plate, atmospheric operation, seizure tower is plate column, and the catch rate of ethanol is 99.92%.Agent for capturing regenerator is plate column, theoretical
Plate number is 31 pieces, atmospheric operation, and reflux ratio is 3.5, and feed entrance point is the 13rd block of plate.The purity of ethanol is 99.77%, the response rate
It is 99.84%.The agent for capturing reclaimed and the agent for capturing containing ethanol are in heat exchanger after heat exchange, and the agent for capturing temperature of recovery is 38 DEG C,
The agent for capturing temperature containing ethanol is 73 DEG C, saves reboiler per hour and add vapours after entering agent for capturing regenerator containing ethanol agent for capturing
268kg。
Embodiment 4
Carboxymethyl cellulose is centrifuged tail gas flow velocity 12040kg/h, and percent mass forms: ethanol 0.53%, other gases
99.47%, temperature is 38 DEG C, and agent for capturing is the double methyl fluoride sulfimide of 1-butyl-3-tolimidazole and the mixture of water,
Its percent mass consists of: the double methyl fluoride sulfimide 74% of 1-butyl-3-tolimidazole, water 26%, its flow velocity is
2360kg/h, temperature is 42 DEG C, and catching tower is 40 blocks of plates, and atmospheric operation, seizure tower is plate column, and the catch rate of ethanol is
99.3%.Agent for capturing regenerator is plate column, and number of theoretical plate is 39 pieces, atmospheric operation, and reflux ratio is 1.5, and feed entrance point is
19 blocks of plates.The purity of ethanol is 99.84%, the response rate is 99.42%.The agent for capturing reclaimed and the agent for capturing containing ethanol are at heat exchanger
After interior heat exchange, the agent for capturing temperature of recovery is 42 DEG C, and the agent for capturing temperature containing ethanol is 72 DEG C, enters agent for capturing containing ethanol agent for capturing
Save reboiler after regenerator per hour and add vapours 259kg.
Embodiment 5
Carboxymethyl cellulose is centrifuged tail gas flow velocity 11530kg/h, and percent mass forms: ethanol 0.3%, other gases
99.7%, temperature is 40 DEG C, and agent for capturing is butyl isoquinolin bis trifluoromethyl sulfimide and the mixture of water, its percent mass
Consisting of: butyl isoquinolin bis trifluoromethyl sulfimide 72%, water 28%, its flow velocity is 2650kg/h, and temperature is 36 DEG C, catches
Catching tower is 35 blocks of plates, atmospheric operation, and seizure tower is plate column, and the catch rate of ethanol is 99.79%.Agent for capturing regenerator is board-like
Tower, number of theoretical plate is 36 pieces, atmospheric operation, and reflux ratio is 4, and feed entrance point is the 20th block of plate.The purity of ethanol is 99.86%,
The response rate is 99.8%.The agent for capturing reclaimed and the agent for capturing containing ethanol are in heat exchanger after heat exchange, and the agent for capturing temperature of recovery is
36 DEG C, the agent for capturing temperature containing ethanol is 77 DEG C, saves reboiler per hour and add after entering agent for capturing regenerator containing ethanol agent for capturing
Vapours 284kg.
Embodiment 6
Carboxymethyl cellulose is centrifuged tail gas flow velocity 12520kg/h, and percent mass forms: ethanol 0.45%, other gases
99.55%, temperature is 39 DEG C, and agent for capturing is hexyl quinoline bis trifluoromethyl sulfimide and the mixture of water, its percent mass
Consisting of: hexyl quinoline bis trifluoromethyl sulfimide 71%, water 29%, its flow velocity is 2080kg/h, and temperature is 37 DEG C, catches
Tower is 35 blocks of plates, atmospheric operation, and seizure tower is plate column, and the catch rate of ethanol is 99.48%.Agent for capturing regenerator is board-like
Tower, number of theoretical plate is 37 pieces, atmospheric operation, and reflux ratio is 5, and feed entrance point is the 13rd block of plate.The purity of ethanol is 99.81%,
The response rate is 99.46%.The agent for capturing reclaimed and the agent for capturing containing ethanol are in heat exchanger after heat exchange, and the agent for capturing temperature of recovery is
37 DEG C, the agent for capturing temperature containing ethanol is 73 DEG C, saves reboiler per hour and add after entering agent for capturing regenerator containing ethanol agent for capturing
Vapours 270kg.
Claims (3)
1. it is centrifuged the processing method of tail gas based on the carboxymethyl cellulose containing ethanol being thermally integrated, it is characterised in that this recycling
Method comprises the steps:
1) carboxymethyl cellulose containing ethanol is centrifuged tail gas and initially enters air filter, at air filterMiddle carboxymethyl
Cellulose dust and some solid particles are through centrifugal and compress precipitated to get off；
2) air filter is passed throughCarboxymethyl cellulose be centrifuged tail gas and enter into seizure tower from tower bottomIn, be captured agent
Catch, form the agent for capturing solution containing ethanol, the air after purification is from catching towerTop is discharged；
3) by step 2) in containing the agent for capturing solution of ethanolIt is incorporated into heat exchangerCarry out being thermally integrated rear temperature and rise to 70-80
DEG C, it is sent to agent for capturing regeneratorIn, agent for capturing regenerator 7. tower bottom reboiler can be saved per hour and add vapours 250-
300kg, obtains high-quality ethanol from tower top, the agent for capturing that is recycled at the bottom of tower；
4) agent for capturing that will reclaim in step 3)Pass through heat exchangerCarry out being thermally integrated rear temperature and be down to 35-45 DEG C, from top
It is passed through seizure towerTo recycle；
5) at agent for capturing regeneratorMiddle through rectification separation, obtain high-quality ethanol at tower top, back into workshop
It is reused for the production of carboxymethyl cellulose；
Described seizure towerAgent for capturing used by is the mixture of ionic liquid and water；
Described agent for capturing intermediate ion liquid is benzothiazoles ionic liquid, benzimidazole ionic liquid, quinolines ionic liquid
The mixture of one or more of body；
Described heat exchangerFor the tubular heat exchanger of single tube Cheng Dan shell side, its heating source is from agent for capturing regeneratorReclaim
Agent for capturing。
The most according to claim 1 it is centrifuged ethanol recovery and treatment method in tail gas based on the carboxymethyl cellulose being thermally integrated,
It is characterized in that: described agent for capturing reaches more than 99.3% to the catch rate of ethanol, the purity of alcohol after recovery reach 99.5% with
On.
The most according to claim 1 it is centrifuged ethanol recovery and treatment method in tail gas based on the carboxymethyl cellulose being thermally integrated,
It is characterized in that: in the air after described purification, the content of ethanol is less than 100ppm.
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| CN101619052B (en) * | 2009-08-03 | 2011-07-27 | 石药集团维生药业（石家庄）有限公司 | Methanol waste gas recovery technology in vitamin C producing process |
| CN101810982A (en) * | 2009-12-25 | 2010-08-25 | 青岛科技大学 | Ethanol-containing waste-gas treatment process flow |
| CN103073388B (en) * | 2013-01-28 | 2015-07-08 | 北京化工大学 | Method for separating alcohol from water through ion liquid extraction and rectification |
| CN103435445A (en) * | 2013-08-20 | 2013-12-11 | 天津科林泰克科技有限公司 | Method for separating mixture of ethanol alcohol and water |
| CN104128064B (en) * | 2014-08-07 | 2016-05-18 | 青岛三瑞节能环保技术有限公司 | A kind of technique and device of containing benzinum waste gas in brufen synthesis procedure processed |
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2015
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