CN109999607A - A kind of benzene homologues exhaust treatment system and method - Google Patents
A kind of benzene homologues exhaust treatment system and method Download PDFInfo
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- CN109999607A CN109999607A CN201910332082.2A CN201910332082A CN109999607A CN 109999607 A CN109999607 A CN 109999607A CN 201910332082 A CN201910332082 A CN 201910332082A CN 109999607 A CN109999607 A CN 109999607A
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- 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
- B01D53/002—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 condensation
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- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- 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
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- 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
- B01D53/18—Absorbing units; Liquid distributors therefor
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Abstract
The present invention relates to a kind of benzene homologues exhaust treatment systems, including spray absorber, absorbing unit, adsorption column regenerative vacuum pump and desorption condenser, spray liquid in the spray adsorption tower is cooling by absorbing liquid cooler, the spray absorber tower top outlet connects absorbing unit bottom inlet by pipeline, the absorbing unit bottom inlet is connect with desorption condenser, and the adsorption column regenerative vacuum pump setting is between desorption condenser and absorbing unit or after desorption condenser.The present invention realizes that the benzene homologues rate of recovery is up to 98% or more, and tail gas qualified discharge in the way of low temperature spray-absorption+absorption+vacuum desorption condensation, invests lower with operating cost.
Description
Technical field
The present invention relates to a kind of benzene homologues exhaust treatment system and methods, belong to environmental protection VOC and administer field.
Background technique
Benzene homologues tail gas is the toxic and harmful gas generated in various chemical production process, wherein benzene homologues refer to benzene,
Toluene, dimethylbenzene, ethylbenzene, styrene etc., the exhaust gas toxicity is big, is absorbed into vivo after Long Term Contact by breathing or skin, will
Cause the damage of the damage of liver, blood forming organ and nervous system, advanced stage can develop as alpastic anemia, or even develop into white
Blood disease.The murder by poisoning of especially benzene is bigger, and benzene is slow in human body metabolism, easily accumulates.With national environmental protection policy increasingly strictly with
And the environmental consciousness of people increasingly improves, benzene homologues qualified discharge is at an increasingly urgent problem.
Currently, the improvement of benzene homologues tail gas is usually combustion method, catalytic oxidation, absorption method and deep cooling+absorption.Burning
On the one hand method needs natural gas combustion-supporting, can consume biggish natural gas, and another aspect benzene homologues belong to inflammable and explosive chemical substance,
There is biggish security risk.The current temperature of catalytic oxidation equally exists security risk at 150-350 DEG C, and high concentration
Benzene homologues tail gas is difficult to qualified discharge after being handled by catalytic oxidation, and becoming carbon dioxide after benzene homologues oxidation is also pair
The huge waste of benzene homologues.Absorption method is more common method, and it is up to standard that simple absorption has the disadvantage in that 1, tail gas is difficult to；
2, required quantity of sorbent is very big, and very high to adsorbent requirement, and the excessive heat for leading to releasing of adsorbance is difficult to and time shift
It removes and there are biggish security risks；3, there is the risk for polymerizeing and blocking adsorption column after the styrene in tail gas is adsorbed.It is deep
The method of cold+absorption solves the problems, such as that adsorbance is excessive, while greatly reduces quantity of sorbent, but deep cooling energy consumption is larger,
And benzene can solidify at 5.5 DEG C, and styrene and dimethylbenzene can also be solidified in cryogenic, there is the risk of blocking pipeline.Therefore,
Safe, economic, reliable, stable benzene homologues exhaust treatment system is problem extremely important and urgent at present.
Summary of the invention
The purpose of the present invention is to overcome the above shortcomings and to provide a kind of benzene homologues exhaust treatment system and methods, utilize
Low temperature spray-absorption+absorption+vacuum desorption condensation mode realizes that the benzene homologues rate of recovery is up to 98% or more, and tail gas row up to standard
It puts, invests lower with operating cost.
The object of the present invention is achieved like this:
A kind of benzene homologues exhaust treatment system, including spray absorber, absorbing unit, adsorption column regenerative vacuum pump and desorption condensation
Device, the spray liquid sprayed in adsorption tower is cooling by absorbing liquid cooler, and the spray absorber tower top outlet passes through pipe
Road connects absorbing unit bottom inlet, and the absorbing unit bottom inlet is connect with desorption condenser, and the absorption column regeneration is true
Sky pump setting is between desorption condenser and absorbing unit or after desorption condenser.
Preferably, the absorbing unit is equipped with one or more adsorption columns.
Preferably, the absorbing unit is equipped with the first adsorption column and the second adsorption column, and first adsorption column and second inhale
Attached column is arranged in parallel, and the spray liquid in the spray adsorption tower is cooling by absorbing liquid cooler, the spray-absorption column overhead
Outlet is separately connected the first adsorption column bottom inlet and the second adsorption column bottom inlet, first absorption column bottom by pipeline
Entrance and the second adsorption column bottom inlet are also connect with adsorption column regenerative vacuum pump respectively, the adsorption column regenerative vacuum pump and de-
Attached condenser connection.
Preferably, the absorbing unit is equipped with multiple filling layers, be successively from top to bottom except water layer, level-one except organic matter layer and
Second level removes organic matter layer, and described except water layer filling water molecules sieve, the level-one is except organic matter layer filling dewatering silica gel and hydrophobic
Zeolite molecular sieve, the second level fill active carbon except organic matter layer.
Preferably, the weight ratio of the water molecules sieve, dewatering silica gel and hydrophobic zeolite molecular sieve mixture, active carbon is
1-2:10:2-3, wherein the weight ratio of hydrophobic zeolite molecular sieve and dewatering silica gel is 1:2-4.
A kind of benzene homologues exhaust gas treating method, using above system, benzene homologues vent gas treatment the following steps are included:
Step 1: spray liquid is cooled to 7-10 DEG C by absorbing liquid cooler, sprayed from spray-absorption column overhead, benzene homologues
Tail gas, which enters spray absorber and spray liquid from spray absorber tower bottom, to carry out after mass-and heat-transfer exchanges, 90% or more benzene homologues
Tail gas is discharged after being absorbed from tower bottom, and each component material is recycled after separating by rectifying；
Step 2: remaining unabsorbed benzene homologues tail gas is discharged from tower top, collet cold insulation is carried out by pipeline and enters absorption list
Member is further adsorbed；
Step 3: carrying out vacuum desorption after absorbing unit adsorption saturation；
Step 4: the organic matter being desorbed is by desorption condenser recycling, tail gas up to standard is through each adsorption column top discharge.
Preferably, in the step 3 when absorbing unit is equipped with the first adsorption column and the second adsorption column, the first adsorption column
It after adsorption saturation, is switched to the second adsorption column and is adsorbed, the first adsorption column is in desorption and regeneration state at this time, adsorbs to first
Column carries out vacuum desorption, and first adsorption column and the second adsorption column alternately work.
Preferably, the offgas outlet temperature of the desorption condenser is controlled at 6-7 DEG C.
Preferably, the absorbing unit is exchanged heat using shell and tube, finned, shell and tube and finned combination, and when absorption inhales
Temperature is 15-25 DEG C in attached column, and temperature is 25-50 DEG C in adsorption column when desorption.
Preferably, the spray liquid is one or more of mixing of ethylbenzene, more ethylbenzene, live distillation residual liquid.
The beneficial effects of the present invention are:
In tail gas 98% or more benzene homologues can be recycled in the present invention, while making tail gas qualified discharge, realize the economy of energy-saving and environmental protection
And social benefit.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Wherein: spray absorber 1；First adsorption column 2；Second adsorption column 3；Adsorption column regenerative vacuum pump 4；Condenser is desorbed
5；Pipeline 6.
Specific embodiment
Referring to Fig. 1, the present invention relates to a kind of benzene homologues exhaust treatment systems, including spray absorber 1, absorbing unit, suction
Attached column regenerative vacuum pump 4 and desorption condenser 5, the spray liquid sprayed in adsorption tower 1 is cooling by absorbing liquid cooler 6,
1 tower top outlet of spray absorber connects absorbing unit bottom inlet by pipeline 6, the absorbing unit bottom inlet and de-
Attached condenser 5 connects, and the setting of adsorption column regenerative vacuum pump 4 is between desorption condenser 5 and absorbing unit or desorption condenses
After device 5.
The absorbing unit is equipped with one or more adsorption columns.
The absorbing unit is equipped with the first adsorption column 2 and the second adsorption column 3, first adsorption column 2 and the second adsorption column 3
It is arranged in parallel, the spray liquid in the spray adsorption tower 1 is cooling by absorbing liquid cooler 6, and 1 tower top of spray absorber goes out
Mouth is separately connected 3 bottom inlet of 2 bottom inlet of the first adsorption column and the second adsorption column, 2 bottom of the first adsorption column by pipeline 6
Portion's entrance and 3 bottom inlet of the second adsorption column are also connect with adsorption column regenerative vacuum pump 4 respectively, the adsorption column regenerative vacuum pump
4 connect with desorption condenser 5.
The pipeline 6 is equipped with cold insulation collet, due to the tail gas come out from spray-absorption column overhead, after the conveying of piping 6,
It can carry out increasing temperature after a degree of heat exchanges with the external world by pipeline 6, therefore by the way of pipeline collet cold insulation
It carries out, leaching, periodic cleaning pipeline liquid collecting are led in the setting of 6 low spot of pipeline.
First adsorption column 2 is identical with 3 structure of the second adsorption column, is equipped with multiple filling layers, successively removes from top to bottom
Water layer, level-one remove organic matter layer and second level removes organic matter layer, described except water layer filling water molecules sieve, the water molecules sieve grain
Diameter is 3-5mm, and the level-one is except organic matter layer filling dewatering silica gel and hydrophobic zeolite molecular sieve, the dewatering silica gel or hydrophobic boiling
The partial size of stone molecular sieve is 1-6mm, and the second level fills active carbon except organic matter layer, and the active carbon is column or spherical.It inhales
Hydrone sieve, dewatering silica gel and hydrophobic zeolite molecular sieve mixture, active carbon weight ratio be 1-2:10:2-3, wherein hydrophobic boiling
The weight ratio of stone molecular sieve and dewatering silica gel is 1:2-4, and the purpose of the water molecules sieve is to remove moisture a small amount of in tail gas,
Moisture can generate large effect to rear end active carbon, and the active carbon of active carbon inevitable dusting during filling, dusting is inhaled
Attached ability is stronger, is easier to ignition or explosion, if moisture does not remove, the heat of the activated carbon adsorption moisture generation of local dusting
Amount may result in kindling or explosion.The purpose of dewatering silica gel or hydrophobic zeolite molecular sieve molecular sieve is to remove major part in tail gas
Benzene homologues；The last a small amount of benzene homologues of activated carbon adsorption qualified discharge after activated carbon adsorption.At current benzene homologues tail gas
The mainstream way of reason is to remove moisture using the method for deep cooling, which is moisture and benzene homologues can pass through deep cooling while remove
It goes, but a disadvantage is that energy consumption is huge.It is all then at high price using dewatering silica gel or hydrophobic zeolite molecular sieve molecular sieve.
A kind of benzene homologues exhaust gas treating method, using above system, benzene homologues vent gas treatment the following steps are included:
Step 1: spray liquid is cooled to 7-10 DEG C by absorbing liquid cooler, sprayed from spray-absorption column overhead, benzene homologues
Tail gas, which enters spray absorber and spray liquid from spray absorber tower bottom, to carry out after mass-and heat-transfer exchanges, 90% or more benzene homologues
Tail gas is discharged after being absorbed from tower bottom, and each component material is recycled after separating by rectifying；
Step 2: remaining unabsorbed benzene homologues tail gas is discharged from tower top, collet cold insulation is carried out by pipeline and enters absorption list
Member is further adsorbed；
Step 3: carrying out vacuum desorption after absorbing unit adsorption saturation；
Step 4: the organic matter being desorbed is by desorption condenser recycling, tail gas up to standard is through each adsorption column top discharge.
In the step 3 when absorbing unit is equipped with the first adsorption column and the second adsorption column, the first adsorption column adsorption saturation
Afterwards, it is switched to the second adsorption column to be adsorbed, the first adsorption column is in desorption and regeneration state at this time, carries out the first adsorption column true
Sky desorption, first adsorption column and the second adsorption column alternately work.
The offgas outlet temperature of the desorption condenser is controlled at 6-7 DEG C, is prevented benzene condensation frosting and is blocked pipeline.
The absorbing unit is warm in adsorption column when absorption using shell and tube, finned, shell and tube and finned combination heat exchange
Degree is 15-25 DEG C, and temperature is 25-50 DEG C in adsorption column when desorption, and desorption uses vacuum desorption (within 2kPa), is avoided
For conventional desorption by the way of being heated at high temperature (100 DEG C or more), there is the risk of explosion and internal combustion in high-temperature heating.
Spray liquid is one or more of mixing of ethylbenzene, more ethylbenzene, live distillation residual liquid in the step 1.Spray liquid warp
After crossing 7-10 DEG C of low temperature progress spray-absorption processing, voc total amount in tail gas can be made to reduce 70-95%, especially benzene and styrene
Total amount can reduce by 99% or more, to the more demanding of adsorbent, it is difficult that benzene is that absorption is easy desorption, therefore needs for benzene and styrene
Extraordinary adsorbent is wanted, extraordinary adsorbent is at high price, and styrene is mainly that the heat generated in adsorption process will lead to styrene
Polymerization.Purpose using ethylbenzene, more ethylbenzene, live distillation residual liquid is comparatively ethylbenzene, more ethylbenzene, live distillation residual liquid are saturated
Vapour pressure is lower, and is not introduced into new impurity, and gathers materials on the spot for most of chemical company, sprays without outsourcing
Liquid；The purpose of low temperature is the saturated vapour pressure for reducing spray liquid (ethylbenzene or more ethylbenzene or live distillation residual liquid), is subsequent adsorbtion
Processing reduces load.
Embodiment 1:
Benzene homologues tail gas include benzene 15%, ethylbenzene 3%, styrene 3%, toluene 1%, dimethylbenzene 1%, moisture 1%, remaining for air or
Nitrogen, spray liquid select one or more of mixing of ethylbenzene, more ethylbenzene, live distillation residual liquid, and 7 DEG C of the temperature of spray liquid will be warm
For the above-mentioned benzene homologues tail gas of 35 DEG C of degree after the processing of 1 low temperature spray-absorption of spray absorber, each component content is respectively benzene
0.05-0.1%, ethylbenzene 2%, styrene 0.005-0.01%, toluene 0.005-0.01%, dimethylbenzene 0.005-0.01%, moisture 1%；
The absorbing unit is equipped with the first adsorption column 2 and the second adsorption column 3,3 structure of first adsorption column 2 and the second adsorption column
It is identical, multiple filling layers are equipped with, are successively to remove organic matter layer and second level except water layer, level-one from top to bottom except organic matter layer, it is described
Except water layer filling water molecules sieve, the water molecules sieve partial size is 3-5mm, and the level-one fills dewatering silica gel except organic matter layer
And hydrophobic zeolite molecular sieve, the partial size of the dewatering silica gel and hydrophobic zeolite molecular sieve is 5mm, and the second level is filled out except organic matter layer
Active carbon is filled, the active carbon is column.Water molecules sieves, dewatering silica gel and hydrophobic zeolite molecular sieve mixture, active carbon
Weight ratio is that the weight ratio of 1:10:2, wherein hydrophobic zeolite molecular sieve and dewatering silica gel are 1:2, and temperature is in adsorption column when absorption
15-25 DEG C, temperature is 25-50 DEG C in adsorption column when desorption, and after the first adsorption column adsorption treatment, moisture is less than 100ppm,
The tail gas benzene being ejected from the first adsorption column is less than 2ppm, and ethylbenzene is less than 10ppm, and styrene is less than 5ppm, and dimethylbenzene is less than
5ppm, dimethylbenzene are less than 5ppm.
To tail gas one or several indexs (benzene≤3mg/m at the top of the first adsorption column3, styrene≤10mg/m3, ethylbenzene≤
50mg/m3；Dimethylbenzene≤10mg/m3；Toluene≤5mg/m3) it is exceeded after, start regenerative vacuum pump, open desorption and regeneration valve, together
When close gas inlet valve, tail gas enter the second adsorption column, adsorption tower heat hot water automatically turn on, with adsorption column Nei Wenlian
Lock keeps 30-40 DEG C of temperature in adsorption column, and desorption condenser cooling water is opened, and condensation regeneration is carried out to desorption tail gas, after 5 hours
Regeneration is completed.The second adsorption column is waited to be saturated.First adsorption column and the second adsorption column alternately 1-2 times guarantee that tail gas is continuous
Processing.
Embodiment 2:
Benzene homologues tail gas include benzene 15%, ethylbenzene 3%, styrene 3%, toluene 1%, dimethylbenzene 1%, moisture 1%, remaining for air or
Nitrogen, spray liquid select one or more of mixing of ethylbenzene, more ethylbenzene, live distillation residual liquid, and 10 DEG C of the temperature of spray liquid will be warm
For the above-mentioned benzene homologues tail gas of 35 DEG C of degree after the processing of 1 low temperature spray-absorption of spray absorber, each component content is respectively 0.05-
1%, ethylbenzene 0.2-2.8%, styrene 0.009-0.01%, toluene 0.006-0.01%, dimethylbenzene 0.005-0.01%, moisture 1%；
First adsorption column 2 is identical with 3 structure of the second adsorption column, is equipped with multiple filling layers, from top to bottom successively be except water layer,
Level-one removes organic matter layer except organic matter layer and second level, and described except water layer filling water molecules sieve, the water molecules sieve partial size is
5mm, the level-one is except organic matter layer filling dewatering silica gel and hydrophobic zeolite molecular sieve, the dewatering silica gel and hydrophobic zeolite molecule
The partial size of sieve is 5mm, and the second level fills active carbon except organic matter layer, and the active carbon is column.Water molecules sieve, hydrophobic silicon
The weight ratio of glue and hydrophobic zeolite molecular sieve mixture, active carbon is 2:10:3, wherein hydrophobic zeolite molecular sieve and dewatering silica gel
Weight ratio be 1:4, temperature is 15-25 DEG C in adsorption column when absorption, and temperature is 25-50 DEG C in adsorption column when desorption, by the
After one adsorption column adsorption treatment, moisture is less than 100ppm, and the tail gas benzene being ejected from the first adsorption column is less than 1ppm, and ethylbenzene is less than
8ppm, styrene are less than 5ppm, and dimethylbenzene is less than 8ppm, and dimethylbenzene is less than 4ppm.
To tail gas one or several indexs (benzene≤3mg/m at the top of the first adsorption column3, styrene≤10mg/m3, ethylbenzene≤
50mg/m3；Dimethylbenzene≤10mg/m3；Toluene≤5mg/m3) it is exceeded after, start regenerative vacuum pump, open desorption and regeneration valve, together
When close gas inlet valve, tail gas enter the second adsorption column, adsorption tower heat hot water automatically turn on, with adsorption column Nei Wenlian
Lock keeps 30-40 DEG C of temperature in adsorption column, and desorption condenser cooling water is opened, and condensation regeneration is carried out to desorption tail gas, after 5 hours
Regeneration is completed.The second adsorption column is waited to be saturated.First adsorption column and the second adsorption column alternately 1-2 times guarantee that tail gas is continuous
Processing.
Embodiment 3:
Benzene homologues tail gas include benzene 15%, ethylbenzene 3%, styrene 3%, toluene 1%, dimethylbenzene 1%, moisture 1%, remaining for air or
Nitrogen, spray liquid select one or more of mixing of ethylbenzene, more ethylbenzene, live distillation residual liquid, and 8 DEG C of the temperature of spray liquid will be warm
For the above-mentioned benzene homologues tail gas of 35 DEG C of degree after the processing of 1 low temperature spray-absorption of spray absorber, each component content is respectively benzene
0.05-0.08%, ethylbenzene 0.2-2.3%, styrene 0.009-0.01%, toluene 0.01-0.02%, dimethylbenzene 0.006-0.01%, water
Divide 1%；
First adsorption column 2 is identical with 3 structure of the second adsorption column, is equipped with multiple filling layers, from top to bottom successively be except water layer,
Level-one removes organic matter layer except organic matter layer and second level, and described except water layer filling water molecules sieve, the water molecules sieve partial size is
5mm, the level-one is except organic matter layer filling dewatering silica gel and hydrophobic zeolite molecular sieve, the dewatering silica gel and hydrophobic zeolite molecule
The partial size of sieve is 5mm, and the second level fills active carbon except organic matter layer, and the active carbon is column.Water molecules sieve, hydrophobic silicon
The weight ratio of glue and hydrophobic zeolite molecular sieve mixture, active carbon is 1.5:10:3, wherein hydrophobic zeolite molecular sieve and hydrophobic silicon
The weight ratio of glue is 1:3, and temperature is 15-25 DEG C in adsorption column when absorption, and temperature is 25-50 DEG C in adsorption column when desorption, is passed through
After first adsorption column adsorption treatment, moisture is less than 100ppm, and the tail gas benzene being ejected from the first adsorption column is less than 7ppm, and ethylbenzene is small
In 5ppm, styrene is less than 6ppm, and dimethylbenzene is less than 8ppm, and dimethylbenzene is less than 3ppm.
To tail gas one or several indexs (benzene≤3mg/m at the top of the first adsorption column3, styrene≤10mg/m3, ethylbenzene≤
50mg/m3；Dimethylbenzene≤10mg/m3；Toluene≤5mg/m3) it is exceeded after, start regenerative vacuum pump, open desorption and regeneration valve, together
When close gas inlet valve, tail gas enter the second adsorption column, adsorption tower heat hot water automatically turn on, with adsorption column Nei Wenlian
Lock keeps 30-40 DEG C of temperature in adsorption column, and desorption condenser cooling water is opened, and condensation regeneration is carried out to desorption tail gas, after 5 hours
Regeneration is completed.The second adsorption column is waited to be saturated.First adsorption column and the second adsorption column alternately 1-2 times guarantee that tail gas is continuous
Processing.
Comparative example 1:
It is same as Example 1, in addition to spray absorber 1 absorbs spray using higher boiling diesel oil room temperature.This comparative example and embodiment 1
It compares, introduces new impurity (diesel oil), the benzene homologues material in the spray liquid rich in benzene homologues after absorption is difficult to recycle；Simultaneously
Outsourcing diesel oil is needed, expense is additionally increased.
Comparative example 2:
It is same as Example 1, in addition to the spray temperature of spray liquid is 12 DEG C.This comparative example compared with Example 1, adsorbs column pressure
Greatly, it is difficult to qualified discharge after running a period of time, the heat that adsorption column generates is difficult to remove in time, and there are security risks.
Comparative example 3:
It is same as Example 1, in addition to the spray temperature of spray liquid is 3 DEG C.Compared with Example 1, energy consumption is high for this comparative example, practical
In operational process, the benzene content in tail gas is fluctuated, when the benzene content in tail gas is higher, and spray absorber tower top benzene content
When higher, benzene vapor can freeze in tower top pipe and block pipeline, greatly increase operation risk.
Comparative example 4:
It is same as Example 1, in addition to being filled only with active carbon in adsorption column.Benzene homologues tail gas is sprayed by 1 low temperature of spray absorber
After absorption processing, each component content is respectively benzene 0.1-0.2%, ethylbenzene 0.2-2%, styrene 0.01-0.03%, toluene 0.01-
0.02%, dimethylbenzene 0.01-0.02%, moisture 1%；
After the first adsorption column adsorption treatment, temperature rise is to 60 DEG C or more in adsorption column, and local temperature can exceed that 100 DEG C, temperature
The tail gas benzene 0.05-0.1% that degree height is unfavorable for adsorbing, therefore is ejected from the first adsorption column, ethylbenzene 0.1-0.3%, styrene
0.005-0.01%, toluene 0.005-0.01%, dimethylbenzene 0.005-0.01%, moisture 100ppm, tail gas is not up to standard, and safety wind
Danger increases significantly.
Comparative example 5:
It is same as Example 1, in addition to level-one except organic matter layer is filled only with hydrophobic zeolite molecular sieve.Benzene homologues tail gas is inhaled by spray
After receiving the processing of 1 low temperature spray-absorption of tower, each component content is respectively benzene 0.1-0.2%, ethylbenzene 0.2-2%, styrene 0.01-
0.03%, toluene 0.01-0.02%, dimethylbenzene 0.01-0.02%, moisture 1%；
After the first adsorption column adsorption treatment, the tail gas benzene 20-50ppm, ethylbenzene 100- that are ejected from the first adsorption column
500ppm, styrene 50-100ppm, dimethylbenzene 5-20ppm, dimethylbenzene 5-20ppm, moisture 0.8%, exhaust emissions is difficult to up to standard.
Comparative example 6:
It is same as Example 1, in addition to level-one except organic matter layer is filled only with dewatering silica gel.Compared with Example 1, the processing of benzene homologues
Effect is close, but expensive.
Comparative example 7:
It is same as Example 1, in addition to the weight ratio of hydrophobic zeolite molecular sieve and dewatering silica gel is 1:1.Benzene homologues tail gas is by spray
After drenching the processing of 1 low temperature spray-absorption of absorption tower, each component content is respectively benzene 0.1-0.2%, ethylbenzene 0.2-2%, styrene 0.01-
0.03%, toluene 0.01-0.02%, dimethylbenzene 0.01-0.02%, moisture 1%；
After the first adsorption column adsorption treatment, the tail gas benzene being ejected from the first adsorption column is less than 6ppm, and ethylbenzene is less than
15ppm, styrene are less than 5ppm, and dimethylbenzene is less than 8ppm, and dimethylbenzene is less than 5ppm.Tail gas is difficult to qualified discharge.
In conclusion vent gas treatment effect of the present invention is best, safety coefficient highest, the benzene homologues rate of recovery is up to 98% or more,
It is economical and practical, it is more suitable for industrialized production.
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments
The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.
Claims (10)
1. a kind of benzene homologues exhaust treatment system, it is characterised in that: including spray absorber (1), absorbing unit, absorption column regeneration
Vacuum pump (4) and desorption condenser (5), the spray liquid sprayed in adsorption tower (1) is cooling by absorbing liquid cooler (6),
Spray absorber (1) tower top outlet connects absorbing unit bottom inlet, the absorbing unit bottom inlet by pipeline (6)
It is connect with desorption condenser (5), adsorption column regenerative vacuum pump (4) setting is between desorption condenser (5) and absorbing unit
Or after desorption condenser (5).
2. a kind of benzene homologues exhaust treatment system according to claim 1, it is characterised in that: the absorbing unit is equipped with one
A or multiple adsorption columns.
3. a kind of benzene homologues exhaust treatment system according to claim 2, it is characterised in that: the absorbing unit is equipped with the
One adsorption column (2) and the second adsorption column (3), first adsorption column (2) and the second adsorption column (3) are arranged in parallel, the spray
Spray liquid in adsorption tower (1) is cooling by absorbing liquid cooler (6), and spray absorber (1) tower top outlet passes through pipeline
(6) the first adsorption column (2) bottom inlet and the second adsorption column (3) bottom inlet, the first adsorption column (2) bottom are separately connected
Entrance and the second adsorption column (3) bottom inlet are also connect with adsorption column regenerative vacuum pump (4) respectively, the absorption column regeneration vacuum
Pump (4) is connect with desorption condenser (5).
4. a kind of benzene homologues exhaust treatment system according to claim 1, it is characterised in that: the absorbing unit is equipped with more
Layer filler is successively that organic matter layer and second level are removed except water layer, level-one from top to bottom except organic matter layer, described except water layer filling water suction
Molecular sieve, the level-one are filled except organic matter layer filling dewatering silica gel and hydrophobic zeolite molecular sieve, the second level except organic matter layer
Active carbon.
5. a kind of benzene homologues exhaust treatment system according to claim 4, it is characterised in that: the water molecules sieve is dredged
Water silicon glue and hydrophobic zeolite molecular sieve mixture, active carbon weight ratio be 1-2:10:2-3, wherein hydrophobic zeolite molecular sieve and
The weight ratio of dewatering silica gel is 1:2-4.
6. a kind of benzene homologues exhaust gas treating method, it is characterised in that: using system described in one of claim 1-5, benzene series
Object vent gas treatment the following steps are included:
Step 1: spray liquid is cooled to 7-10 DEG C by absorbing liquid cooler, sprayed from spray-absorption column overhead, benzene homologues
Tail gas, which enters spray absorber and spray liquid from spray absorber tower bottom, to carry out after mass-and heat-transfer exchanges, 90% or more benzene homologues
Tail gas is discharged after being absorbed from tower bottom, and each component material is recycled after separating by rectifying；
Step 2: remaining unabsorbed benzene homologues tail gas is discharged from tower top, collet cold insulation is carried out by pipeline and enters absorption list
Member is further adsorbed；
Step 3: carrying out vacuum desorption after absorbing unit adsorption saturation；
Step 4: the organic matter being desorbed is by desorption condenser recycling, tail gas up to standard is through each adsorption column top discharge.
7. a kind of benzene homologues exhaust gas treating method according to claim 6, it is characterised in that: work as absorption in the step 3
When unit is equipped with the first adsorption column and the second adsorption column, after the first adsorption column adsorption saturation, it is switched to the second adsorption column and is inhaled
Attached, the first adsorption column is in desorption and regeneration state at this time, carries out vacuum desorption, first adsorption column and the to the first adsorption column
Two adsorption columns alternately work.
8. a kind of benzene homologues exhaust gas treating method according to claim 6, it is characterised in that: the tail of the desorption condenser
Gas outlet temperature is controlled at 6-7 DEG C.
9. a kind of benzene homologues exhaust gas treating method according to claim 6, it is characterised in that: the absorbing unit is using column
Tubular type, finned, shell and tube and finned combination heat exchange, temperature is 15-25 DEG C in adsorption column when absorption, when desorption in adsorption column
Temperature is 25-50 DEG C.
10. a kind of benzene homologues exhaust gas treating method according to claim 6, it is characterised in that: the spray liquid be ethylbenzene,
One or more of mixing of more ethylbenzene, live distillation residual liquid.
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| CN205461670U (en) * | 2016-01-11 | 2016-08-17 | 中国石油化工股份有限公司 | Storage tank discharged waste gas's deep purification recovery unit |
| CN106187668A (en) * | 2016-07-06 | 2016-12-07 | 上海聚友化工有限公司 | A kind of method that in Synthetic Leather waste gas, Organic substance reclaims |
| CN106621711A (en) * | 2016-12-23 | 2017-05-10 | 北京万信同和能源科技有限公司 | Treatment method for gas containing high-concentration benzene |
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