CN106187668B - A kind of method that organic matter recycles in Synthetic Leather exhaust gas - Google Patents
A kind of method that organic matter recycles in Synthetic Leather exhaust gas Download PDFInfo
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- CN106187668B CN106187668B CN201610528017.3A CN201610528017A CN106187668B CN 106187668 B CN106187668 B CN 106187668B CN 201610528017 A CN201610528017 A CN 201610528017A CN 106187668 B CN106187668 B CN 106187668B
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- C07—ORGANIC CHEMISTRY
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- C07C7/11—Purification; Separation; Use of additives by absorption, i.e. purification or separation of gaseous hydrocarbons with the aid of liquids
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Abstract
The invention discloses the methods that organic matter in a kind of Synthetic Leather exhaust gas recycles.It uses ionic liquid, liquid esters for special absorptive agent, in absorption tower, upstream synthetic leather exhaust gas after cooling is handled by way of low temperature spray, after organic matter toluene, butanone and DMF in exhaust gas are absorbed by low temperature absorption agent, it is introduced into desorber and carries out Desorption separation recycling toluene, butanone, then DMF is recycled by vacuum distillation tower Desorption separation；Containing ionic liquid 50 70%, dibutyl terephthalate 5 25%, butylene terephthalate 15 25%, ethylene m-phthalate 5 15% in the special absorptive agent；The special absorptive agent boiling point is higher than 300 DEG C, is suitable for absorbing toluene, butanone and DMF.This method can high efficiente callback DMF and toluene, organic efficiency is high, and the DMF purity being recovered to is more than 99%, and the toluene that is recovered to, butanone low-boiling-point organic compound purity are more than 99.5%.
Description
Technical field
The invention belongs to technical field of waste gas treatment, it is related to the side that organic matter recycles in a kind of Synthetic Leather exhaust gas
Method.
Background technology
Synthetic leather is an important component of plastics industry, side aspect of the application field throughout people's daily life
Face.It has many advantages, such as the excellent mechanical performance such as wear-resistant, anti-aging, while being also equipped with that easy to process, price is excellent honest and clean.Mesh
Before, the production of synthetic leather generally uses base stock of the polyurethane PU as base's knead dough layer, passes through DMF (N, N- dimethyl methyls
Amide), toluene etc. is made as primary solvent with solution polymerization process.It is organic molten due to the use of a large amount of volatiles in production process
Agent is coated with the products of a large amount of organic solvents in airtight oven through 60~170 DEG C especially in producing surface treatment process
When high-temperature process, exhaust gas of a large amount of volatiles containing DMF, toluene will produce.The manufacture of dry-method chemical leather is made with heating means
Solvent volatilization in polyurethane PU, forms film, then it is attached on fiber base material, and solvent dosage accounts about resin use
60% or more of amount, production technology determine solvent in process of production in addition to seldom partly remaining in product other than, remaining is greatly
Part is then evaporated, and the exhausted air quantity that dry process production line generates accounts for about 95% of exhausted air quantity in entire synthetic leather industry.It is general dry
Solvent is made of other solvents (toluene, butanone) of about 70% DMF and about 30% in method production, these solvents are in an oven about
There is 85% or more to volatilize, if direct emission, the health of worker and neighbouring resident will be seriously affected, and pollute atmospheric environment.
The method that organic matter recycles in existing Synthetic Leather exhaust gas, main active carbon adsorption and solvent absorption
Method.Solvent absorption is usually the organic matter used water or DMF as absorbent and received back and forth in Synthetic Leather exhaust gas.Made with water
The defect of absorbent is：Water can absorb the DMF in exhaust gas, but water cannot absorb the organic matters such as toluene, butanone in exhaust gas；With
The defect that DMF makees absorbent is：The low boiling point (154 DEG C) of DMF, dosage is big, need to there are one increase again on the basis of absorption tower existing
Add an absorption tower, the organic matters such as DMF and toluene, butanone could be separated by being adsorbed twice.In addition, existing useless
The defects of that there is also organic efficiencies is low for organic compounds recovery method in gas, the DMF and not high enough toluene purity that recycle.
Invention content
It is an object of the invention to：Overcome the deficiencies of the prior art and provide the DMF that a kind of organic efficiency is high, recycling obtains
The method that organic matter recycles in the Synthetic Leather exhaust gas high with toluene purity.
The purpose of the present invention is what is be achieved through the following technical solutions：
The method that organic matter recycles in a kind of Synthetic Leather exhaust gas of the present invention is as follows：Using ionic liquid, liquid ester
Class be special absorptive agent, in absorption tower, low temperature spray by way of to upstream synthetic leather exhaust gas after cooling into
Row absorption is handled, and after the organic matters such as toluene, butanone and DMF in exhaust gas are absorbed by low temperature absorption agent, is introduced into desorber progress
Desorption separation recycles toluene, butanone and other low-boiling-point organic compound mixtures, then carries out desorption point by vacuum distillation tower again
From recycling DMF (or carrying out desorption recycling to the DMF solution for reaching certain saturation degree)；The special absorptive agent is mixed solution,
Wherein each component mass percent is：Ionic liquid 50-70%, dibutyl terephthalate 5-25%, terephthalic acid (TPA) fourth two
Ester 15-25%, ethylene m-phthalate 5-15%；Wherein, ionic liquid and dibutyl terephthalate ratio between the two
Example is adjustable, is 11:1-2:1, it is preferably in a proportion of 2.5:1；Butylene terephthalate is between the two with ethylene m-phthalate
Ratio it is adjustable, be 4:1-1:1, it is preferably in a proportion of 1:1；The special absorptive agent boiling point is higher than 300 DEG C, and volatility very little is being inhaled
Tower top will not be carried to up by receiving in tower, absorb tower top exhaust gas can direct emission therefore can will be absorbed by once absorbing
The organic matters such as agent and toluene, butanone, DMF separate.
The specific embodiment of organic compounds recovery method is as follows in above-mentioned Synthetic Leather exhaust gas：
(1) absorption section
From workshop high-temp waste gas (50-110 DEG C, total VOCs about 4000mg/m3) First Heat Exchanger is sent into (comprising three-level
It is cooling：The first order is air cooling, and the second level is low temperature waste gas cooling, and the third level is that chilled water or chilled brine cool down), through the
One heat exchanger (is down to 5-10 DEG C) after cooling, and enters absorption tower from absorption tower lower part, in absorption tower, low temperature waste gas with from
(5-10 DEG C) of the low temperature absorption agent that tower top sprays carries out counter current contacting, and the toluene, butanone and DMF in low temperature waste gas are abundant
After absorption, low temperature waste gas comes out from tower top, then is directly discharged into air after First Heat Exchanger and high-temp waste gas are exchanged heat, wherein
Toluene level is less than 15mg/m3, DMF contents are less than 10mg/m3, VOCs is less than 40mg/m3；Organic matter total removal rate is more than 99%；
From absorb the bottom of the tower come out absorbing liquid, contain toluene, butanone, DMF, water and absorbent, by the second heat exchanger with
The absorbing liquid come out from desorber bottom carries out heat exchange, is desorbed into desorber after improving temperature.
Absorption technique condition：Absorption tower operation temperature, preferably 5-10 DEG C, pressure are 100~200KPa of absolute pressure.
(2) light component desorbs workshop section
The absorbing liquid containing toluene, butanone, DMF, water and absorbent after preheating, into desorber, under normal pressure
It is desorbed, toluene, butanone and the water desorbed from tower top, pre-separation tank is entered after condenser, water and organic matter is first
It detaches, organic matter overflow to return tank, (reflux ratio 0.5-5, preferably 2-3) enters knockout drum after partial reflux, in knockout drum
After standing split-phase, it is (mixed for toluene, butanone and low-boiling-point organic compound that upper layer can obtain organic matter of the purity more than 99.5%
Close object, no longer need to detach, can direct reuse in workshop), lower layer be waste water (otherwise processed is needed according to wastewater flow rate and COD sizes)；
The absorbing liquid containing DMF and water come out from bottom of tower after desorption, into after absorbing liquid pans, by desorbing column bottoms pump
It types it out；It is set after desorbing column bottoms pump there are two triple valve, when the content of DMF in the absorbing liquid that desorber bottom comes out is less than
When 10-15%, using the two triple valves, by the connecting pipeline between the two triple valves, which changes into second
Hot device carries out heat exchange with the low temperature absorption liquid from absorption tower bottom, and difference passes through third heat exchanger and/or the 4th heat exchanger again
Heat exchange is carried out with refrigerant, after temperature reduces, Sprayer Circulation utilization is carried out into absorption tower top.
Light component desorption technique condition：150-300 DEG C of desorber bottom temperature, preferably 180-250 DEG C, pressure tower are absolute pressure
100~200KPa.
(3) heavy constituent desorbs workshop section
(it can judge from desorber column bottom temperature when the content of DMF in the absorbing liquid that desorber bottom comes out is more than 10-15%
Out), two triple valves (without the connecting pipeline between the two triple valves) after desorption column bottoms pump, the absorption are utilized
Liquid enters vacuum distillation tower, is desorbed DMF therein by vacuum distillation tower；The desorption come out from vacuum distillation tower bottom of tower
Absorbing liquid afterwards enters recycling and absorbs flow container, enters the second heat exchanger later and carries out heat with the low temperature absorption liquid from absorption tower bottom
It exchanges, heat exchange is carried out with refrigerant by third heat exchanger and/or the 4th heat exchanger again respectively, after temperature reduces, into absorption
Top of tower carries out Sprayer Circulation utilization；Vacuum distillation tower tower overhead gas after condenser enter return tank (reflux ratio 0.5-5,
It is preferred that 2-3), it is required according to process tower, storage tank is entered after partial reflux, obtain the DMF that purity is more than 99%.
Heavy constituent desorption technique condition：130-200 DEG C of vacuum distillation tower bottom temperature, preferably 150-180 DEG C, pressure tower are
Absolute pressure 30-90KPa, preferably 50-70KPa.
The above process is the process that interval recycles DMF.In addition it is also possible to select to carry out the process of continuously recycling DMF, i.e.,：
The absorbing liquid typed it out from desorption column bottoms pump, no matter wherein the content of DMF is also to be less than 10-15%, all more than 10-15%
Without the connecting pipeline between two triple valves after desorption column bottoms pump, all enter vacuum distillation tower, then from vacuum distillation
Tower bottom of tower out enters recycling and absorbs flow container, is changed respectively through the second heat exchanger, third heat exchanger and/or the 4th heat exchanger again later
Enter after heat and carries out Sprayer Circulation utilization at the top of absorption tower.
The chilled water of preferred 0-5 DEG C of refrigerant in above-mentioned steps (2) and step (3).
Beneficial effects of the present invention：
The method that organic matter recycles in the Synthetic Leather exhaust gas of the present invention has following technical characterstic：
(1) the advantages of being integrated with active carbon adsorption and water absorption method, and the optimization of technology is carried out, filtering out can fit
Special absorptive agent (ionic liquid, liquid esters absorbent, composition for absorbing toluene, butanone and DMF：Ionic liquid, to benzene
Dibutyl carboxylic acid is main component, is greater than or equal to 70%；Other ingredients：Butylene terephthalate, M-phthalic acid second
30%) diester etc. is less than, can high efficiente callback DMF and toluene, eliminate pollution of the exhaust gas to environment to greatest extent.This method recycles
Efficient, the DMF and toluene purity recycled is high.This method can also flexibly and easily select to DMF carry out interval recycling or
Continuous recycling.
(2) the advantages of being integrated with current main-stream process activity carbon adsorption and water absorption method, and carried out technology
Optimization, is more suitable for that Synthetic Leather exhaust gas is handled and recycled, reaches resource circulation utilization purpose.
(3) the cooling equipment of organic high-temp waste gas cryogenics, reasonable design cools down house exhaust, absorbent,
Ensure absorption efficiency；
(4) energy reuse technology.Optimization technological process rationally utilizes heat and cold, reduces energy consumption, improves absorbent effect
Rate.
Technical scheme of the present invention has technical advantage as is evident below compared with similar research both at home and abroad：
First, trapping organic exhaust gas is sprayed using proprietary absorbent, the absorption efficiency of DMF and toluene are higher than and currently use water
Make the absorption efficiency of absorbent.
Second, proprietary absorbent difficulty volatilization is big to DMF and toluene solubility, reduces absorbent dosage, has compared to conventional
Solvent (such as DMF makees absorbent) reduces secondary pollution.
Third, due to recycling toluene and DMF simultaneously, total organic matter rate of recovery is higher than individually recycling one of which organic matter
Mode.
4th, technical flow design is reasonable, and comprehensive energy consumption reduces about 20%.
Description of the drawings
Fig. 1 is the process route chart for the method that organic matter recycles in a kind of Synthetic Leather exhaust gas of the present invention；
Fig. 2 is the technological process detail drawing for the method that organic matter recycles in a kind of Synthetic Leather exhaust gas of the present invention.
Specific implementation mode
Below in conjunction with drawings and examples, the present invention is further illustrated.
Embodiment 1
As shown in Figure 1, the method that organic matter recycles in a kind of Synthetic Leather exhaust gas of the present invention, it uses ionic liquid
Body, liquid esters are that (the special absorptive agent boiling point is higher than 300 DEG C, and volatility very little will not be by absorption tower for special absorptive agent
Be carried to tower top up, absorb tower top exhaust gas can direct emission therefore can be by absorbent and toluene, fourth by once absorbing
The organic matters such as ketone, DMF separate), in absorption tower, to upstream synthesis after cooling by way of low temperature spray
Leather exhaust gas carries out absorption processing, after the organic matters such as toluene, butanone and DMF in exhaust gas are absorbed by low temperature absorption agent, into desorption
Tower carries out Desorption separation recycling toluene, butanone and low-boiling-point organic compound mixture (light component desorption), then to reaching certain full
Desorption recycling (heavy constituent desorption) is carried out with the DMF solution of degree.
Each component mass percent is in the special absorptive agent：Ionic liquid 50%, dibutyl terephthalate 20%,
Butylene terephthalate 15%, ethylene m-phthalate 15%；Wherein, the ratio of ionic liquid and dibutyl terephthalate
Example is 2.5:1, the ratio of butylene terephthalate and ethylene m-phthalate is 1:1.
As shown in Fig. 2, the method that organic matter recycles in a kind of Synthetic Leather exhaust gas of the present invention, specific embodiment is such as
Under：
(1) absorption section
From workshop high-temp waste gas (80 DEG C, total VOCs about 4000mg/m3) First Heat Exchanger 10H01A is sent into (comprising three
Grade is cooling：First through first order air cooling to 50 DEG C, then through second level low temperature waste gas 30 DEG C are cooled to, then through third level chilled water
Or chilled brine is cooled to 10 DEG C) carry out heat exchange be cooled to 10 DEG C (becoming low temperature waste gas), then under the 10C01A of absorption tower
Portion's (close to bottom) enters absorption tower, in absorption tower, low temperature waste gas and the low temperature absorption agent (10 DEG C) sprayed from tower top
Counter current contacting is carried out, after toluene, butanone and the DMF in low temperature waste gas are fully absorbed, low temperature waste gas comes out from tower top, then through the
One heat exchanger 10H01A is directly discharged into air after being exchanged heat with high-temp waste gas and (recycle cold), and wherein toluene level is less than
15mg/m3, DMF contents are less than 10mg/m3, VOCs is less than 40mg/m3；Total removal rate is more than 99%.
The absorbing liquid come out from the absorption tower bottoms 10C01A, contains toluene, butanone, DMF, water and absorbent, is changed by second
Hot device 10H02 heat exchange (taking away from the heat in the absorbing liquid containing DMF and water that desorber bottom comes out), enters solution after improving temperature
Tower 20C01 is inhaled to be desorbed.
Absorption technique condition：Absorption tower operation temperature is 10 DEG C, and pressure tower is absolute pressure 200KPa.
(2) light component desorbs workshop section
The absorbing liquid containing toluene, butanone, DMF, water and absorbent after preheating, into desorber 20C01, normal
Pressure is desorbed, toluene, butanone and the water desorbed from tower top, and pre-separation tank is entered after condenser, by water and organic
Object first detaches, organic matter overflow to return tank 20T01, and (reflux ratio 2.5) enters knockout drum after partial reflux, logical in knockout drum
After crossing standing split-phase, can obtain purity more than 99.5% organic matter (for toluene, butanone and low-boiling-point organic compound mixture,
No longer need to detach, can direct reuse in workshop), lower layer be waste water (otherwise processed is needed according to wastewater flow rate and COD sizes).
The absorbing liquid containing DMF and water come out from bottom of tower after desorption passes through desorption into after absorbing liquid pans 20T04
Column bottoms pump 20P04 is typed it out；It is set after desorbing column bottoms pump 20P04 there are two triple valve, when the absorbing liquid that desorber bottom comes out
It, should using the two triple valves (by the connecting pipeline between the two triple valves) when the content of middle DMF is less than 10-15%
Absorbing liquid enters the second heat exchanger 10H02 and carries out heat exchange with the low temperature absorption liquid from the absorption tower bottoms of tower 10C01A, respectively again
Heat exchange is carried out by third heat exchanger 10H03 and the 4th heat exchanger 10H04 and 5 DEG C of chilled water, after temperature is reduced to 10 DEG C,
Sprayer Circulation utilization is carried out at the top of into absorption tower 10C01A.
Light component desorption technique condition：Desorber temperature is 300 DEG C, and pressure tower is absolute pressure 200KPa.
(3) heavy constituent desorbs workshop section
(it can judge from desorber column bottom temperature when the content of DMF in the absorbing liquid that desorber bottom comes out is more than 10-15%
Out), using desorption column bottoms pump 20P04 after two triple valves (without the connecting pipeline between the two triple valves),
The absorbing liquid enters vacuum distillation tower 30C01, is desorbed DMF therein by vacuum distillation tower；From vacuum distillation tower tower
Absorbing liquid after the desorption that bottom comes out enters recycling and absorbs flow container, is absorbed after flow container comes out (with fresh absorption flow container from recycling
Outlet line merge after) enter the second heat exchanger 10H02 with from the absorption tower bottoms of tower 10C01A low temperature absorption liquid carry out heat
It exchanges, heat exchange, temperature drop is carried out by third heat exchanger 10H03 and the 4th heat exchanger 10H04 and 5 DEG C of chilled water again respectively
Down to after 10 DEG C, Sprayer Circulation utilization is carried out into the tops absorption tower 10C01A；Vacuum distillation tower tower overhead gas passes through condenser
Enter return tank 30T01 (reflux ratio 2.5) after 30H01, required according to process tower, storage tank 30T03 is entered after partial reflux, is obtained
It is more than 99% DMF to purity.
Heavy constituent desorption technique condition：Vacuum distillation tower temperature is 200 DEG C, and pressure tower is absolute pressure 60KPa.
Embodiment 2
The method that organic matter recycles in a kind of Synthetic Leather exhaust gas of the present invention, specific embodiment is with embodiment 1, no
It is with place：Absorption technique condition：Absorption tower operation temperature is 5 DEG C, and pressure tower is absolute pressure 100KPa；Light component desorption technique
Condition：150 DEG C of desorber temperature, pressure tower are absolute pressure 100KPa；Heavy constituent desorption technique condition：Vacuum distillation tower temperature 130
DEG C, pressure tower is absolute pressure 30KPa；
Reflux ratio in above-mentioned steps (2) and step (3) is 5；
Each component mass percent is in the special absorptive agent：Ionic liquid 55%, dibutyl terephthalate 5%,
Butylene terephthalate 25%, ethylene m-phthalate 15%；Wherein, both ionic liquid and dibutyl terephthalate
Between ratio be 11:1；Butylene terephthalate and ethylene m-phthalate ratio between the two are 5:3.
Embodiment 3
The method that organic matter recycles in a kind of Synthetic Leather exhaust gas of the present invention, specific embodiment is with embodiment 1, no
It is with place：Absorption technique condition：Absorption tower operation temperature is 8 DEG C, and pressure tower is absolute pressure 150KPa；Light component desorption technique
Condition：180 DEG C of desorber temperature, pressure tower are absolute pressure 150KPa；Heavy constituent desorption technique condition：Vacuum distillation tower temperature 150
DEG C, pressure tower is absolute pressure 70KPa；
Reflux ratio in above-mentioned steps (2) and step (3) is 0.5；
Each component mass percent is in the special absorptive agent：Ionic liquid 60%, dibutyl terephthalate 20%,
Butylene terephthalate 15%, ethylene m-phthalate 5%；Wherein, both ionic liquid and dibutyl terephthalate
Between ratio be 3:1；Butylene terephthalate and ethylene m-phthalate ratio between the two are 3:1.
Embodiment 4
The method that organic matter recycles in a kind of Synthetic Leather exhaust gas of the present invention, specific embodiment is with embodiment 1, no
It is with place：Absorption technique condition：Absorption tower operation temperature is 6 DEG C, and pressure tower is absolute pressure 120KPa；Light component desorption technique
Condition：250 DEG C of desorber temperature, pressure tower are absolute pressure 180KPa；Heavy constituent desorption technique condition：Vacuum distillation tower temperature 180
DEG C, pressure tower is absolute pressure 50KPa；
Reflux ratio in above-mentioned steps (2) and step (3) is 2；
Each component mass percent is in the special absorptive agent：Ionic liquid 50%, dibutyl terephthalate 25%,
Butylene terephthalate 20%, ethylene m-phthalate 5%；Wherein, both ionic liquid and dibutyl terephthalate
Between ratio be 2:1；Butylene terephthalate and ethylene m-phthalate ratio between the two are 4:1.
Embodiment 5
The method that organic matter recycles in a kind of Synthetic Leather exhaust gas of the present invention, specific embodiment is with embodiment 1, no
It is with place：Absorption technique condition：Absorption tower operation temperature is 9 DEG C, and pressure tower is absolute pressure 180KPa；Light component desorption technique
Condition：200 DEG C of desorber temperature, pressure tower are absolute pressure 160KPa；Heavy constituent desorption technique condition：Vacuum distillation tower temperature 165
DEG C, preferably 160 DEG C, pressure tower is absolute pressure 90KPa；
Reflux ratio in above-mentioned steps (2) and step (3) is 3；
Each component mass percent is in the special absorptive agent：Ionic liquid 60%, dibutyl terephthalate 15%,
Butylene terephthalate 15%, ethylene m-phthalate 10%；Wherein, both ionic liquid and dibutyl terephthalate
Between ratio be 4:1；Butylene terephthalate and ethylene m-phthalate ratio between the two are 1.5:1.
The absorbing liquid typed it out from desorption column bottoms pump, no matter wherein the content of DMF is also to be less than 10- more than 10-15%
15%, all without the connecting pipeline between two triple valves after desorption column bottoms pump 20P04, all enter vacuum distillation tower,
DMF therein is desorbed by vacuum distillation tower；Enter back from the absorbing liquid after the desorption that vacuum distillation tower bottom of tower comes out
It receives and absorbs flow container, absorbed from recycling and enter the second heat exchange (after merging with the fresh outlet line for absorbing flow container) after flow container comes out
Device 10H02 carries out heat exchange with the low temperature absorption liquid from the absorption tower bottoms of tower 10C01A, and difference passes through third heat exchanger 10H03 again
Heat exchange is carried out with the 4th heat exchanger 10H04 and 5 DEG C of chilled water, after temperature is reduced to 10 DEG C, is pushed up into absorption tower 10C01A
Portion carries out Sprayer Circulation utilization.
Claims (10)
1. a kind of method that organic matter recycles in Synthetic Leather exhaust gas, which is characterized in that using ionic liquid, liquid esters
It is useless to upstream synthetic leather after cooling in such a way that 5-10 DEG C of low temperature sprays in absorption tower for special absorptive agent
Gas carries out absorption processing, after organic matter toluene, butanone and the DMF in exhaust gas are absorbed by 5-10 DEG C of low temperature absorption agent, is introduced into
Desorber carries out Desorption separation recycling toluene, butanone, and then carrying out Desorption separation by vacuum distillation tower again recycles DMF；It is described
Each component mass percent is in special absorptive agent：Ionic liquid 50-70%, dibutyl terephthalate 5-25%, to benzene two
Formic acid fourth diester 15-25%, ethylene m-phthalate 5-15%；Wherein, the ratio of ionic liquid and dibutyl terephthalate
Example is 11:1-2:1；Butylene terephthalate and the ratio of ethylene m-phthalate are 4:1-1:1；The special absorptive agent is boiled
Point is higher than 300 DEG C.
2. the method that organic matter recycles in Synthetic Leather exhaust gas as described in claim 1, which is characterized in that described special
In absorbent, the ratio of ionic liquid and dibutyl terephthalate is 2.5:1, butylene terephthalate and M-phthalic acid
The ratio of second diester is 1:1.
3. the method that organic matter recycles in Synthetic Leather exhaust gas as claimed in claim 1 or 2, which is characterized in that specific
Technical process is as follows：
(1) absorption section
High-temp waste gas from workshop enters absorption tower after First Heat Exchanger cools to 5-10 DEG C from absorption tower lower part,
In absorption tower, 5-10 DEG C of low temperature waste gas and 5-10 DEG C of the low temperature absorption agent sprayed from tower top carry out counter current contacting,
After toluene, butanone and DMF in low temperature waste gas are fully absorbed, low temperature waste gas comes out from tower top, then through First Heat Exchanger and height
Warm exhaust gas is directly discharged into air after being exchanged heat, wherein toluene level is less than 15mg/m3, DMF contents are less than 10mg/m3, VOCs is small
In 40mg/m3；Organic matter total removal rate is more than 99%；
The absorbing liquid come out from absorb the bottom of the tower, contains toluene, butanone, DMF, water and absorbent, by the second heat exchanger with from solution
It inhales the absorbing liquid that bottom of tower comes out and carries out heat exchange, desorbed into desorber after improving temperature；
(2) light component desorbs workshop section
The absorbing liquid containing toluene, butanone, DMF, water and absorbent after preheating carries out under normal pressure into desorber
Desorption, toluene, butanone and the water desorbed from tower top enter pre-separation tank after condenser, water and organic matter are first detached,
Organic matter overflow enters knockout drum to return tank after partial reflux, after knockout drum is by standing split-phase, it is big that upper layer obtains purity
In 99.5% organic matter, which is toluene, butanone and low-boiling-point organic compound mixture, no longer needs to detach, can directly return
For workshop；Lower layer is waste water, and otherwise processed is needed according to wastewater flow rate and COD sizes；
The absorbing liquid containing DMF and little water come out from bottom of tower after desorption passes through desorber bottom into after absorbing liquid pans
Pump types it out；It is set after desorbing column bottoms pump there are two triple valve, when the content of DMF in the absorbing liquid that desorber bottom comes out is less than
When 10-15%, using the two triple valves, by the connecting pipeline between the two triple valves, which changes into second
Hot device carries out heat exchange with the low temperature absorption liquid from absorption tower bottom, and difference passes through third heat exchanger and/or the 4th heat exchanger again
Heat exchange is carried out with refrigerant, after temperature reduces, Sprayer Circulation utilization is carried out into absorption tower top；
(3) heavy constituent desorbs workshop section
When the content of DMF in the absorbing liquid that desorber bottom comes out is more than 10-15%, two three after desorption column bottoms pump are utilized
Port valve, without the connecting pipeline between the two triple valves, which enters vacuum distillation tower, will by vacuum distillation tower
DMF therein is desorbed；From vacuum distillation tower bottom of tower come out desorption after absorbing liquid enter recycling absorb flow container, it is laggard
Enter the second heat exchanger and carry out heat exchange with the low temperature absorption liquid from absorption tower bottom, passes through third heat exchanger and/or the again respectively
Four heat exchangers carry out heat exchange with refrigerant, and after temperature reduces, Sprayer Circulation utilization is carried out into absorption tower top；Vacuum distillation tower
Tower overhead gas enters return tank after condenser, enters storage tank after partial reflux, obtains the DMF that purity is more than 99%.
4. the method that organic matter recycles in Synthetic Leather exhaust gas as claimed in claim 3, which is characterized in that
Absorption technique condition：Absorption tower operation temperature is 5-10 DEG C, and pressure is 100~200KPa of absolute pressure；
Light component desorption technique condition：Desorber temperature is 150-300 DEG C, and pressure is 100~200KPa of absolute pressure；
Heavy constituent desorption technique condition：Vacuum distillation tower temperature is 130-200 DEG C, and pressure is absolute pressure 30-90KPa.
5. the method that organic matter recycles in Synthetic Leather exhaust gas as claimed in claim 4, which is characterized in that
Desorber temperature is 180-250 DEG C；Vacuum distillation tower temperature is 150-180 DEG C, pressure 50-70KPa.
6. the method that organic matter recycles in Synthetic Leather exhaust gas as claimed in claim 3, which is characterized in that from desorber
Bottom pumps the absorbing liquid typed it out, no matter wherein the content of DMF is 10-15% to be also less than, all without solution more than 10-15%
The connecting pipeline between two triple valves after suction column bottoms pump, all enters vacuum distillation tower, then go out from vacuum distillation tower bottom of tower
Flow container is absorbed to enter recycling, is entered after the heat exchange of the second heat exchanger, third heat exchanger and/or the 4th heat exchanger respectively again later
Sprayer Circulation utilization is carried out at the top of absorption tower.
7. the method that organic matter recycles in Synthetic Leather exhaust gas as claimed in claim 3, which is characterized in that step (1)
In, 50-110 DEG C of the high-temp waste gas from workshop, after First Heat Exchanger cools to 5-10 DEG C, from absorption tower lower part into
Enter absorption tower, in absorption tower, which carries out adverse current with 5-10 DEG C of the low temperature absorption agent sprayed from tower top and connect
It touches.
8. the method that organic matter recycles in Synthetic Leather exhaust gas as claimed in claim 3, which is characterized in that step (2)
In, the absorbing liquid containing DMF and water come out from bottom of tower after desorption squeezes into the second heat exchanger into absorbing liquid pans by pump
Heat exchange is carried out with the low temperature absorption liquid of 5-10 DEG C from absorption tower bottom, is changed again by third heat exchanger and/or the 4th respectively
Hot device carries out heat exchange with refrigerant, and temperature is reduced to 5-10 DEG C, subsequently into progress Sprayer Circulation utilization at the top of absorption tower；Step
(2) and in step (3) reflux ratio of return tank is 0.5-5.
9. the method that organic matter recycles in Synthetic Leather exhaust gas as claimed in claim 8, which is characterized in that step (2)
Reflux ratio with return tank in step (3) is 2-3.
10. the method that organic matter recycles in Synthetic Leather exhaust gas as claimed in claim 8, which is characterized in that
First Heat Exchanger in step (1) is cooled down comprising three-level：The first order is air cooling, and the second level cools down for low temperature waste gas,
The third level is that chilled water or chilled brine cool down；The chilled water that refrigerant in step (2) and step (3) is 0-5 DEG C.
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| CN109999607A (en) * | 2019-04-10 | 2019-07-12 | 江苏双良低碳产业技术研究院有限公司 | A kind of benzene homologues exhaust treatment system and method |
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