CN104474836B - Solvent based coating volatile pollutants processing method - Google Patents
Solvent based coating volatile pollutants processing method Download PDFInfo
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- CN104474836B CN104474836B CN201410571480.7A CN201410571480A CN104474836B CN 104474836 B CN104474836 B CN 104474836B CN 201410571480 A CN201410571480 A CN 201410571480A CN 104474836 B CN104474836 B CN 104474836B
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Abstract
The invention discloses a kind of operating cost cheap while the most ideal solvent based coating volatile pollutants processing method of purified treatment effect, it is particularly as follows: utilize gas dispatch equipment that through the passage of closing, solvent based coating volatile pollutants is caused adsorption tower, described adsorption stuffing uses activated carbon, and the step of regenerating active carbon technique includes: 1) activated carbon that need to regenerate and an organic solvent liquid phase are mixed；2) activated carbon mass percentage concentration mechanical separation gone out is 1～the NaOH aqueous solution of 2% or KOH aqueous solution are carried out；3) after saponification, activated carbon is washed, leach after in activated carbon, add activator in activated carbon weight/activator weight equal to the ratio of (10～18)/1；4) activated carbon is washed, leach and is dried after reaction, obtain the activated carbon after regeneration；Wherein, described activator by terms of ammonium 0.2～1% weight ammonium salt, 4～10% weight phosphoric acid, 1～5% weight oxalic acid and the deionized water of remaining weight mix.
Description
Technical field
The present invention relates to solvent based coating volatile pollutants purification treatment technology, particularly relate to solvent based coating preparation and application
The purification treatment technology of the VOC (Volatile Organic Compounds, i.e. VOC) produced in journey.
Background technology
It is known that solvent based coating exists the problem of environmental pollution.While it is true, owing to solvent based coating compares water in performance
Property coating occupies clear superiority, and therefore solvent based coating still has certain range of application.In solvent based coating preparation and coating process
Produced VOC is the main cause that this coating causes environmental pollution.Although prior art existing and multiple VOC being purified
The technology processed, but in these technology or there is the problem that complex process, operating cost are higher, or it is the best to there is clean-up effect
Problem, is difficult to take into account cheap operating cost and excellent clean-up effect.
Summary of the invention
First technical problem to be solved by this invention be to provide a kind of operating cost cheap while purified treatment effect the most more manage
The solvent based coating volatile pollutants processing method thought.
For solving above-mentioned first technical problem, the solvent based coating volatile pollutants processing method of the present invention, the method is for molten
Produced air pollution treatment in the preparation of dosage form coating or coating process, itself particularly as follows:
The solvent based coating volatile pollutants utilizing gas dispatch equipment to be produced by said process causes adsorption tower through the passage of closing,
Make described volatile pollutants again from absorption in the entrance entrance adsorption tower of adsorption tower and after the adsorption cleaning of adsorption stuffing processes
Purified gas is discharged in the outlet of tower；
Described adsorption stuffing uses activated carbon, and periodically the activated carbon after use a period of time is discharged from adsorption tower and carried out
Reinstalling this adsorption tower after Regeneration Treatment to recycle, the step of regenerating active carbon technique includes:
1) mix to dissolve with this organic solvent fluid by the activated carbon that need to regenerate and an organic solvent liquid phase and replace absorption on activated carbon
VOC, then mechanical separation activated carbon and organic solvent fluid；
2) activated carbon mass percentage concentration mechanical separation gone out is 1～the NaOH aqueous solution of 2% or KOH aqueous solution are carried out clearly
Wash and make the organic solvent of residual and saponification reaction on activated carbon；
3) after saponification, activated carbon is washed, leach after by activated carbon weight/activator weight equal to (10～18)/1
Ratio adds activator in activated carbon, and described activator and activated carbon is sufficiently mixed and reacts 7～10 hours；
4) activated carbon is washed, leach and is dried after reaction, obtain the activated carbon after regeneration；
Wherein, described activator is by terms of ammonium 0.2～1% ammonium salt, 4～10% phosphoric acid, 1～5% oxalic acid of weight of weight of weight
And the deionized water of remainder weight mixes.
Above-mentioned regenerating active carbon technique ultimate principle is: first passes through organic solvent fluid and dissolves the VOC of absorption on activated carbon
And displacement；With alkali, (mass percentage concentration is 1～the NaOH aqueous solution of 2% or KOH aqueous solution, and its mass percentage concentration is unsuitable again
More than 2%, otherwise activated carbon may be impacted) activated carbon that goes out mechanical separation carries out saponification defat；Thereafter activator is used
Carry out reacting the saturation of elimination activity charcoal with activated carbon, thus recover its absorbability；Finally wash, leach and be dried,
Activated carbon after regeneration.
The step 1 of above-mentioned regenerating active carbon technique) in can use the organic solvent fluid of multiple solubilized VOC, such as dimethylbenzene,
Industrial alcohol etc..It is preferable to employ C9 aromatic is described organic solvent fluid.C9 aromatic not only using effect is good and toxicity is little
Will not endanger the healthy of field operation personnel, the organic solvent fluid that mechanical separation goes out simultaneously also can be back to painting, will not lead
Cause follow-up derivative pollution problem.
The effect of above-mentioned activator is the saturation of elimination activity charcoal, thus recovers its absorbability.Applicant passes through numerous studies
Finding with test, the collocation using the activator of above-mentioned formula, especially phosphoric acid to add oxalic acid uses, and is possible not only to generation and makes us frightened
Different activation effect, its composition is all easy to the low cost feedstock obtained simultaneously, thus reduces solvent based coating volatile pollutants
The operating cost of processing method.
The activating mechanism of this activator is: by the mixed acid of phosphoric acid Yu oxalic acid, the impurity on activated carbon is carried out acidolysis, Qi Zhongyou
Using ammonium as the catalyst of acidolysis reaction, thus the saturation of elimination activity charcoal, the absorbability of effective activity recovery charcoal.
Described ammonium salt preferably employs ammonium chloride.Above-mentioned activator also can be further preferably by 2～3% ammonium chloride, 5～7% weight of weight
The phosphoric acid of amount, 1～3% weight oxalic acid and the deionized water of remaining weight mix.So effect of activation is more preferable.
Activator also can further preferably going by the ammonium chloride of 2% weight, the phosphoric acid of 5% weight, the oxalic acid of 2% weight and remaining weight
Ionized water mixes.Its activation effect is particularly pertinent.
The step 4 of above-mentioned regenerating active carbon technique) in can take in reacted mixture, directly to add water tune pH value to 6.5～7
Then stirring realizes the washing of activated carbon.The most convenient to operate, the regenerative process of activated carbon can be accelerated.
As the further improvement to above-mentioned processing method, can first volatile pollutants be introduced in a mechanical dust collector to collect wherein
Entrained solid granule, introduces adsorption tower by this mechanical dust collector expellant gas the most again；Wherein, this mechanical dust collector has
Have and the gas entered from the air inlet of this mechanical dust collector to the diffusion structure of diffusion bottom cleaner unit and is positioned on diffusion structure
Side for stopping the barrier structure that the solid particle in gas flows up, have the gas of bending between diffusion structure and barrier structure
Circulation road, gas channel and the mechanical dust collector air vent conducting being positioned at above barrier structure.Above-mentioned mechanical dust collector is compared existing
Mechanical dust collector can be more efficient the solid particle isolated in volatile pollutants, it is to avoid it enters adsorption tower, improves absorption and fills out
The working time of material, it also is able to reduce the solid particulate matter in environment is discharged simultaneously.
The above-mentioned solvent based coating volatile pollutants processing method of the present invention utilizes the activated carbon in adsorption tower to volatilize solvent based coating
Pollutant carry out adsorption cleaning process, and it is simple that pollution processes technics comparing, and in purified gas, VOC content meets discharge mark
Accurate；The method also uses the regenerating active carbon technique of a set of simple and efficient and achieves recycling of activated carbon simultaneously.Therefore,
The method has the strongest cost advantage and runs conveniency advantage, and environmental benefit highlights, and can be widely applied to solvent based coating raw
Produce and paint industry.
Second technical problem to be solved by this invention is to provide the renovation process of a kind of VOC absorption activated carbon and special work thereof
Agent, carries out Regeneration Treatment to VOC absorption activated carbon thus has the absorbability of this activated carbon of efficient recovery.
For solving above-mentioned second technical problem, the renovation process of the VOC absorption activated carbon of the present invention, its step includes:
1) mix to dissolve with this organic solvent fluid by the activated carbon that need to regenerate and an organic solvent liquid phase and replace absorption on activated carbon
VOC, then mechanical separation activated carbon and organic solvent fluid；
2) activated carbon mass percentage concentration mechanical separation gone out is 1～the NaOH aqueous solution of 2% or KOH aqueous solution are carried out clearly
Wash and make the organic solvent of residual and saponification reaction on activated carbon；
3) after saponification, activated carbon is washed, leach after by activated carbon weight/activator weight equal to (10～18)/1
Ratio adds activator in activated carbon, and described activator and activated carbon is sufficiently mixed and reacts 7～10 hours；
4) activated carbon is washed, leach and is dried after reaction, obtain the activated carbon after regeneration；
Wherein, described activator is by terms of ammonium 0.2～1% ammonium salt, 4～10% phosphoric acid, 1～5% oxalic acid of weight of weight of weight
And the deionized water of remainder weight mixes.
Clean by the renovation process of the above-mentioned VOC absorption activated carbon of the present invention being used for the absorption of solvent based coating volatile pollutants
The activated carbon that change processes repeatedly regenerates and shows, this renovation process can the absorbability of activity recovery charcoal of simple and efficient.And
And, the renovation process of this VOC absorption activated carbon can be repeated regeneration to activated carbon, i.e. will not be because of the increasing of regeneration times
Add and reduce regeneration effect.
Described step 1) in preferably employ C9 aromatic as described organic solvent.
Described activator can be further preferably by 2～3% ammonium chloride, 5～7% phosphoric acid, 1～3% oxalic acid of weight of weight of weight
And the deionized water of remainder weight mixes.
Described activator can be more preferably by the ammonium chloride of 2% weight, the phosphoric acid of 5% weight, the oxalic acid of 2% weight and remaining weight
Deionized water mixes.
It addition, described step 4) in can take to add water in reacted mixture tune pH value to 6.5～7 then stirring come real
The washing of existing activated carbon.
The special activating agent of the renovation process of above-mentioned VOC absorption activated carbon, by terms of ammonium 0.2～1% ammonium salt, 4～10% of weight
The phosphoric acid of weight, 1～5% weight oxalic acid and the deionized water of remaining weight mix.
The activator of this formula is possible not only to produce amazing activation effect, and its composition is all easy to the low cost obtained simultaneously
Raw material.Therefore, the operating cost that VOC absorption regeneration method of active carbon is cheap has been fully ensured that.
Described activator can be further preferably by 2～3% ammonium chloride, 5～7% phosphoric acid, 1～3% oxalic acid of weight of weight of weight
And the deionized water of remainder weight mixes.
Described activator also can be more preferably by the ammonium chloride of 2% weight, the phosphoric acid of 5% weight, the oxalic acid of 2% weight and remaining weight
Deionized water mix.
The preparation method of above-mentioned activator is: phosphoric acid, oxalic acid is added in deionized water in setting ratio and is warming up to 45～55 DEG C,
It is subsequently adding ammonium chloride and is stirred, transparent without being layered and get final product to mixed liquor.
On the basis of the renovation process of above-mentioned VOC absorption activated carbon, the present invention incidentally additionally provides a kind of VOC absorption activity
The using method of charcoal, specifically utilizes gas dispatch equipment that through the passage of closing, the dusty gas containing VOC is caused adsorption tower,
Make described dusty gas again from suction in the entrance entrance adsorption tower of adsorption tower and after being processed by the adsorption cleaning of active carbon filler
Purified gas is discharged in the outlet of attached tower；Wherein
Active carbon filler after periodically using a period of time reinstalls this suction after discharging from adsorption tower and carry out circular regeneration process
Attached tower re-uses, and the step of regenerating active carbon technique includes:
1) mix to dissolve with this organic solvent fluid by the activated carbon that need to regenerate and an organic solvent liquid phase and replace absorption on activated carbon
VOC, then mechanical separation activated carbon and organic solvent fluid；
2) activated carbon mass percentage concentration mechanical separation gone out is 1～the NaOH aqueous solution of 2% or KOH aqueous solution are carried out clearly
Wash and make the organic solvent of residual and saponification reaction on activated carbon；
3) after saponification, activated carbon is washed, leach after by activated carbon weight/activator weight equal to (10～18)/1
Ratio adds activator in activated carbon, and described activator and activated carbon is sufficiently mixed and reacts 7～10 hours；
4) activated carbon is washed, leach and is dried after reaction, obtain the activated carbon after regeneration；
Wherein, described activator is by terms of ammonium 0.2～1% ammonium salt, 4～10% phosphoric acid, 1～5% oxalic acid of weight of weight of weight
And the deionized water of remainder weight mixes.
As the further improvement of the using method to above-mentioned VOC absorption activated carbon, first described dusty gas can be introduced a machine
To collect wherein entrained solid granule in tool cleaner unit, the most again this mechanical dust collector expellant gas is introduced adsorption tower；Should
Mechanical dust collector has by the gas that enters from the air inlet of this mechanical dust collector to bottom cleaner unit diffusion diffusion structure and
It is positioned at the barrier structure flowed up for the solid particle stopping in gas above diffusion structure, described diffusion structure and stop
The gas channel of bending, described gas channel and the mechanical dust collector air vent conducting being positioned at above barrier structure is had between structure.
3rd technical problem to be solved by this invention is to provide that a kind of operating cost is cheap and the solvent of purified treatment excellent effect
Type coating volatile pollutants processing system.
For solving above-mentioned 3rd technical problem, the solvent based coating volatile pollutants processing system of the present invention, it is coated with for solvent-borne type
Produced air pollution treatment in material preparation or coating process, this system includes that the solvent-borne type for producing in said process is coated with
The material volatile pollutants passage through closing carries out adsorption cleaning and processes the most again from the outlet discharge purification of adsorption tower in causing adsorption tower
The gas dispatch equipment of rear gas, is provided with adsorption stuffing in described adsorption tower, described adsorption stuffing uses anhydrous calcium chloride.
Above-mentioned solvent based coating volatile pollutants processing system it is critical that have employed anhydrous calcium chloride is adsorption stuffing.Nothing
Although water calcium chloride can regenerate not as above-mentioned activated carbon, but owing to anhydrous calcium chloride is cheap and easy to get, therefore ensure that molten equally
The low cost movement that dosage form coating volatile pollutants processes.It addition, shown by checking, the absorption of VOC is imitated by anhydrous calcium chloride
Fruit is the most excellent, and even better than activated carbon adsorption filler is completely out of expecting in advance.
4th technical problem to be solved by this invention be to provide a kind of operating cost cheap while purified treatment effect the most more manage
The solvent based coating thought prepares the volatile pollutants processing method in workshop.
For solving above-mentioned 4th technical problem, the solvent based coating of the present invention prepares the volatile pollutants processing method in workshop, uses
Prepare the air pollution treatment in workshop in solvent based coating, itself particularly as follows:
Paint mixing tank will be produced by being arranged on the suspended hood above paint mixing tank and the gas dispatch equipment that is connected with described suspended hood
Solvent based coating volatile pollutants absorb and through close passage cause adsorption tower, make described volatile pollutants entering from adsorption tower
Purified gas is discharged from the outlet of adsorption tower again in mouth entrance adsorption tower and after the adsorption cleaning of adsorption stuffing processes；
Wherein, described adsorption stuffing uses activated carbon, and the activated carbon after a period of time periodically will be used from adsorption tower discharge
And after carrying out circular regeneration process, reinstall the re-using of this adsorption tower, the step of regenerating active carbon technique includes:
1) mix to dissolve with this organic solvent fluid by the activated carbon that need to regenerate and an organic solvent liquid phase and replace absorption on activated carbon
VOC, then mechanical separation activated carbon and organic solvent fluid；
2) activated carbon mass percentage concentration mechanical separation gone out is 1～the NaOH aqueous solution of 2% or KOH aqueous solution are carried out clearly
Wash and make the organic solvent of residual and saponification reaction on activated carbon；
3) after saponification, activated carbon is washed, leach after by activated carbon weight/activator weight equal to (10～18)/1
Ratio adds activator in activated carbon, and described activator and activated carbon is sufficiently mixed and reacts 7～10 hours；
4) activated carbon is washed, leach and is dried after reaction, obtain the activated carbon after regeneration；
Wherein, described activator is by terms of ammonium 0.2～1% ammonium salt, 4～10% phosphoric acid, 1～5% oxalic acid of weight of weight of weight
And the deionized water of remainder weight mixes.
Equally, described step 1) in preferably employ C9 aromatic as described organic solvent.
Described activator further preferably by 2～3% weight ammonium chloride, 5～7% weight phosphoric acid, 1～3% weight oxalic acid with
And the deionized water of remainder weight mixes.
Described activator more preferably going by the ammonium chloride of 2% weight, the phosphoric acid of 5% weight, the oxalic acid of 2% weight and remaining weight
Ionized water mixes.
Described step 4) in can take to add water in reacted mixture tune pH value to 6.5～7 then stirring realize activity
The washing of charcoal.
Prepare the volatile pollutants processing method in workshop due to above-mentioned solvent based coating there is the strongest cost advantage and run conveniency
Advantage, can be widely applied to solvent based coating manufacturing enterprise.
5th technical problem to be solved by this invention be to provide that operating cost is cheap and purified treatment excellent effect solvent-borne type
The volatile pollutants processing system in workshop prepared by coating.
For solving above-mentioned 5th technical problem, the solvent based coating of the present invention prepares the volatile pollutants processing system in workshop, uses
Prepare the air pollution treatment in workshop in solvent based coating, this system includes being arranged on the suspended hood above paint mixing tank and with described
Suspended hood is connected to be generated by solvent based coating volatile pollutants the leading to through closing that suspended hood absorbs in described paint mixing tank
Road carries out adsorption cleaning and processes the gas dispatch equipment of gas after purification is discharged in the outlet of adsorption tower the most again in causing adsorption tower,
Being provided with adsorption stuffing in described adsorption tower, described adsorption stuffing uses anhydrous calcium chloride.
It is adsorption stuffing owing to above-mentioned solvent based coating prepare the volatile pollutants processing system in workshop to have employed anhydrous calcium chloride, from
And the low cost that the system that ensure that is run and the good adsorption effect to VOC.
The present invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.Aspect that the present invention adds and advantage will under
Giving out in the middle part of the description in face, part will become apparent from the description below, or is recognized by the practice of the present invention.
Accompanying drawing explanation
Fig. 1 is the volatile pollutants process schematic diagram that in the present invention, solvent based coating prepares car.
Fig. 2 is the structural representation of a kind of detailed description of the invention of adsorption tower in the present invention.
Fig. 3 is a kind of structural representation of mechanical dust collector in the present invention.
Fig. 4 is that the volatile pollutants of solvent based coating coating workshop in the present invention processes schematic diagram.
Fig. 5 is a kind of regeneration technology flow chart of VOC absorption activated carbon of the present invention.
Detailed description of the invention
As shown in Figures 1 to 3, prepare workshop 100 for solvent based coating and devise two set air pollution treatment schemes.This two set side
Case is all by being arranged on the suspended hood 210 (the most corresponding suspended hood 210 above each paint mixing tank 110) above paint mixing tank 110
And the solvent based coating volatile pollutants 500 that the gas dispatch equipment being connected with described suspended hood 210 will produce in paint mixing tank 110
(mainly VOC) absorption the passage through closing cause adsorption tower 250, make described volatile pollutants from the entrance of adsorption tower 250
Discharge from the outlet of adsorption tower 250 again in entering adsorption tower 250 and after the adsorption cleaning of adsorption stuffing 251 processes after purifying
Gas (can be directly to airborne release).Wherein, the adsorption stuffing in the adsorption tower 250 of first set volatile pollutants processing scheme
251 use activated carbon, the adsorption stuffing 251 in the adsorption tower 250 of the second set volatile pollutants processing scheme to use anhydrous chlorination
Calcium.One as gas dispatch equipment is concrete, and this gas dispatch equipment includes causing solvent based coating volatile pollutants 500
The front end airflow pipeline 230 of adsorption tower 250 entrance and the rear end gas exhaust piping 270 from adsorption tower 250 outlet discharge gas,
Described front end airflow pipeline 230 is provided with blower fan 220 and rear end gas exhaust piping 270 is provided with blower fan 260, Qi Zhong
The blower fan 260 that rear end gas exhaust piping 270 is arranged is standby fan.
In first set scheme running, can be according to being arranged on the VOC concentration detection device that solvent based coating is prepared in workshop 100
The instruction of 280 controls the operation of gas dispatch equipment.Such as, detect that VOC concentration reaches when VOC concentration detection device 280
To 200mg/Nm3, blower fan can be started and carry out pump drainage, thus by suspended hood 210 gas in workshop absorbed and pass through
The pipeline closed enters adsorption tower 250 and processes；When VOC concentration detection device 280 detects under VOC concentration to 100mg/Nm3
Time, blower fan can be closed, to save the energy.Prepare workshop 100 when solvent based coating and produce a certain amount of solvent based coating, inhale
Activated carbon in attached tower 250 tends to saturated, is discharged from adsorption tower 250 by activated carbon and carries out at special circular regeneration
Reinstall again this adsorption tower 250 after reason to re-use.
As it is shown in figure 5, the step of its regenerating active carbon technique includes: 1) activated carbon that need to regenerate mixed mutually with C9 aromatic with
Dissolve and replace the VOC of absorption on activated carbon with C9 aromatic, then by filtration or centrifuge machinery isolating active charcoal and carbon nine
Aromatic hydrocarbons；2) activated carbon mass percentage concentration mechanical separation gone out be 1～2% NaOH aqueous solution be carried out making activated carbon
The C9 aromatic of upper residual and saponification reaction；3) after saponification, activated carbon is washed, leach after by activated carbon weight/
Activator weight adds activator equal to the ratio of (10～18)/1 in activated carbon, and described activator is the most mixed with activated carbon
Merge reaction 7～10 hours；4) activated carbon is washed, leach and is dried after reaction, obtain the activated carbon after regeneration；Its
In, described activator uses by 1.5～3% ammonium chloride, 4～10% phosphoric acid, 1～5% oxalic acid of weight and remaining of weight of weight
The deionized water of lower weight mixes.
Owing to the regeneration of activated carbon needs the regular hour, affect solvent based coating during in order to avoid regenerating active carbon and prepare workshop 100
Production, as in figure 2 it is shown, be provided with the first absorbing unit that can independently load and unload adsorption stuffing 251 in described adsorption tower 250
250a and the second absorbing unit 250b, to the adsorption stuffing 251 in the first absorbing unit 250a and the second absorbing unit 250b first
After regenerate, when regenerating the adsorption stuffing 251 of one of them absorbing unit, another absorbing unit works on.Tool
For body, as in figure 2 it is shown, utilize in adsorption tower 250 breathable membrane 252 (such as net-like spacer) be separated out multilamellar for
Filling the chamber of adsorption stuffing 251, wherein the first absorbing unit 250a includes 2～4 layers of chamber near adsorption tower 250 entrance
(Fig. 2 includes 2 layers), the second absorbing unit 250b includes that 2～4 layers of chamber near adsorption tower 250 outlet (wrap in Fig. 2
Include 2 layers), one end of the first absorbing unit 250a and the second absorbing unit 250b is respectively equipped with feeding port 253 and opens and closes feeding port
The movable sealer of 253, movable sealer can fill adsorption stuffing after opening in each chamber of the first absorbing unit 250a
251, the other end of the first absorbing unit 250a and the second absorbing unit 250b is respectively equipped with discharge gate 254 and opens and closes discharge gate
The movable sealer of 254, discharge gate 254 can discharge adsorption stuffing after opening in each chamber of the first absorbing unit 250a
251.First the discharge gate 254 of the first absorbing unit 250a or the second absorbing unit 250b is opened when activated carbon need to be regenerated,
Close immediately after discharging activated carbon, this amount of activated charcoal sent for regeneration then will discharged, and adsorption tower 250 remains filled with work
The absorbing unit of property charcoal will work on, to be regenerated after activated carbon reload after adsorption tower 250 again to latter part of activity
Charcoal regenerates, thus avoids Workshop Production and stop work.
In second sets of plan running, also according to being arranged on the VOC concentration detection dress that solvent based coating is prepared in workshop 100
Put 280 to control the operation of gas dispatch equipment.When VOC concentration detection device 280 detects that VOC concentration reaches 200mg/Nm3,
I.e. start blower fan and carry out pump drainage；When VOC concentration detection device 280 detects under VOC concentration to 100mg/Nm3Time, close blower fan.
When solvent based coating is prepared after workshop 100 produces a certain amount of solvent based coating, and the anhydrous calcium chloride in adsorption tower 250 tends to full
With, owing to anhydrous calcium chloride is non-renewable, therefore discharge and transfer to dangerization useless solid from adsorption tower 250 the most saturated anhydrous calcium chloride
Company processes, and recharges new anhydrous calcium chloride in adsorption tower 250.
For above-mentioned two sets of plan, it is contemplated that often possibly together with a certain amount of solid particle in solvent based coating volatile pollutants 500,
If do not carried out anticipating the use time of adsorption stuffing 251 that can affect, therefore, as it is shown in figure 1, also can set in gas dispatch
The standby front end being above positioned at adsorption tower 250 connects a mechanical dust collector 240, thus first described volatile pollutants is introduced this machinery and remove
To collect wherein entrained solid granule in dirt device 240, the most again this mechanical dust collector 240 expellant gas is introduced adsorption tower
250.But existing mechanical dust collector 240 is relatively low to the separation efficiency of the solid particle in gas, directly uses, effect is also paid no attention to
Think.Therefore, it is suggested that use the mechanical dust collector 240 of following structure: described mechanical dust collector 240 has and will remove from this machinery
Diffusion structure that the gas that the air inlet of dirt device 240 enters spreads bottom cleaner unit and be positioned at above diffusion structure for hindering
The barrier structure that solid particle in gear gas flows up, has the gas channel of bending between described diffusion structure and barrier structure
243, described gas channel 243 and the mechanical dust collector 240 air vent conducting being positioned at above barrier structure.
Such as Fig. 1, the one more specifically embodiment of described mechanical dust collector 240 is: diffusion structure includes diffusion shell 241, diffusion
The top of cover 241 is provided with upwardly extending air inlet pipe 244；Barrier structure includes being enclosed in the annular cover plate outside air inlet pipe 244
242, the outward flange of this annular cover plate 242 extends to the inwall of mechanical dust collector 240, the inner port edge of annular cover plate 242 and expansion
Gap between eliminating stagnation structure forms gas channel 243.So, solvent based coating volatile pollutants 500 will enter from air inlet pipe 244
Enter diffusion shell 241 and spread to the bottom of mechanical dust collector 240 by diffusion shell 241 so that solvent based coating volatile pollutants
In 500, the solid particle of big particle diameter settles downwards, and the solid particle being wherein not easy the small particle of sedimentation is upwards being rolled over air-flow
During Huiing, the overwhelming majority is stopped by annular cover plate 242 again, it is achieved gas solid separation, in solvent based coating volatile pollutants 500
VOC between the inner port edge and diffusion structure of annular cover plate 242 bending gas channel 243 enter annular cover plate 242
In upper chamber, finally discharge from mechanical dust collector 240 air vent and move to adsorption tower 250.Wherein, described annular cover plate
242 are preferably obliquely installed so that its inner port edge is less than its outward flange, in order to avoid annular cover plate 242 upper surface dust stratification.
Such as Fig. 3, the another kind more specifically embodiment of described mechanical dust collector 240 is: diffusion structure still includes diffusion shell 241,
The top of diffusion shell 241 is provided with upwardly extending air inlet pipe 244；Barrier structure then includes upper and lower spaced two-layer baffle plate,
Upper strata baffle plate includes the stripe board 245 of two pieces of horizontal positioned, and lower floor's baffle plate includes the stripe board 245 of one piece of horizontal positioned, phase up and down
Stripe board 245 between adjacent two-layer baffle plate is in interlaced arrangement.So, solvent based coating volatile pollutants 500 will be from air inlet pipe 244
Enter diffusion shell 241 and spread to the bottom of mechanical dust collector 240 by diffusion shell 241 so that solvent based coating volatilization is polluted
In thing 500, the solid particle of big particle diameter settles downwards, and is wherein not easy the solid particle of the small particle of sedimentation with air-flow upwards
During turning back, owing to the stripe board 245 between adjacent two layers baffle plate is in interlaced arrangement so that solid particle 510 always quilt
Wherein the stripe board 245 in one layer of baffle plate is stopped, and then realizes more efficient gas solid separation, solvent based coating volatile pollutants
The VOC in 500 bending gas channel 243 between stripe board 245 enters in the upper chamber of baffle plate, finally removes from machinery
Dirt device 240 air vent is discharged and moves to adsorption tower 250.The cross section of each stripe board 245 is also designed to arch upward,
Solid particle 510 run up formation reflection.
Such as Fig. 4, for the air pollution treatment of solvent based coating coating workshop 600, by being arranged on the honest and clean cabinet of water (in figure
Not shown) the solvent based coating volatilization that will produce of the suspended hood of top and the gas dispatch equipment that is connected with described suspended hood pollutes
Thing absorption the passage through closing cause adsorption tower 250, make described volatile pollutants enter adsorption tower from the entrance of adsorption tower 250
In 250 and discharging purified gas from the outlet of adsorption tower 250 again after the adsorption cleaning of adsorption stuffing 251 processes (can
Directly to airborne release), wherein, the adsorption stuffing 251 in adsorption tower 250 still uses activated carbon or uses anhydrous calcium chloride.When
When employing activated carbon is adsorption stuffing 251, the regeneration technology of activated carbon is ibid.It addition, be positioned at absorption on gas dispatch equipment
The front end of tower 250 is also associated with a mechanical dust collector 240, has from this mechanical dust collector 240 in this mechanical dust collector 240
The diffusion structure that spreads bottom cleaner unit of gas that enters of air inlet and be positioned at above diffusion structure for stopping in gas
The barrier structure that flows up of solid particle, have the gas channel 243 of bending, institute between described diffusion structure and barrier structure
The mechanical dust collector 240 air vent conducting stating gas channel 243 and be positioned at above barrier structure.
Embodiment 1
As shown in Figure 1,5, certain solvent based coating is prepared workshop 100 and is set 14 paint mixing tanks 110 altogether.When VOC concentration detection dress
Put 280 and detect that the VOC concentration in workshop reaches 200mg/Nm3, i.e. start blower fan and carry out pump drainage, thus by corresponding to each tune
Suspended hood 210 on paint can 110 gas that paint mixing tank 110 distributes is absorbed and through close pipeline enter adsorption tower 250
Inside process.Gas first passes through mechanical dust collector 240 before entering adsorption tower 250 and processes, this mechanical dust collector 240
Structure shown in concrete employing Fig. 1.Gas after being processed by adsorption tower 250 adsorption cleaning directs out portion's airborne release,
VOC concentration in discharge gas is maintained at≤130mg/Nm3.Equipped with 700kg activated carbon in adsorption tower 250.Work as solvent based coating
After producing 1000 tons of solvent based coatings in preparation workshop 100, the activated carbon in adsorption tower 250 basically reaches saturated.At this moment, then
700kg activated carbon is all released from adsorption tower 250, and collects with the scuffing of cylinder bore 400 bottom adsorption tower 250.Hereafter will draw
Cylinder 400 moves to a blender, adds the C9 aromatic (i.e. C9 solvent in Fig. 5) of 400kg in scuffing of cylinder bore 400, and
Start blender the activated carbon added with C9 aromatic is stirred, until being sufficiently mixed and use carbon nine by activated carbon and C9 aromatic
Aromatic hydrocarbons dissolves and replaces the VOC of absorption on activated carbon；Then, utilize centrifuge machinery isolating active charcoal and C9 aromatic, separate
The C9 aromatic direct reuse gone out is in painting, and isolated activated carbon is then with the NaOH aqueous solution that mass percentage concentration is 1%
400kg mixes, so that the organic solvent of residual and saponification reaction on activated carbon；After saponification, activated carbon is carried out
Wash, leach addition 45kg activator in backward activated carbon, and described activator and activated carbon are sufficiently mixed and react 7 hours,
Wherein, activator is mixed by the deionized water of the ammonium chloride of 3% weight, the phosphoric acid of 9% weight, the oxalic acid of 1% weight and remaining weight
Conjunction forms, and the preparation of activator is phosphoric acid, oxalic acid to be added in deionized water in setting ratio and are warming up to 50 DEG C, is subsequently adding
Ammonium chloride is also stirred, transparent without being layered and get final product to mixed liquor；After reaction, then the tune pH value that adds water in reacted mixture
Then stirring the washing realizing activated carbon to 6.5～7, then leach activated carbon and be dried, drying mode is taked by activated carbon extremely
Constant temperature 80 DEG C keeping 12 hours, the activated carbon after the most i.e. being regenerated in baking oven.The activated carbon of regeneration is reinstalled again
Adsorption tower 250 uses.After using said method 5000 tons of solvent based coatings of accumulative production, to the work regenerated through the 5th
Property charcoal is tested, and its absorption property remains at the 86% of former absorption property.
Embodiment 2
From embodiment 1 to differ only in activator formula different.Activator in embodiment 2 by the ammonium chloride of 2% weight, 5%
The deionized water of the phosphoric acid of weight, the oxalic acid of 2% weight and remaining weight mixes.Same at 5000 tons of solvents of accumulative production
After type coating, testing the activated carbon regenerated through the 5th, its absorption property is maintained at the 93% of former absorption property.
Embodiment 3
As shown in Figure 1,3, certain solvent based coating is prepared workshop 100 and is set 14 paint mixing tanks 110 altogether.When VOC concentration detection dress
Put 280 and detect that the VOC concentration in workshop reaches 200mg/Nm3, i.e. start blower fan and carry out pump drainage, thus by corresponding to each tune
Suspended hood 210 on paint can 110 gas that paint mixing tank 110 distributes is absorbed and through close pipeline enter adsorption tower 250
Inside process.Gas first passes through mechanical dust collector 240 before entering adsorption tower 250 and processes, this mechanical dust collector 240
Structure shown in concrete employing Fig. 3.Gas after being processed by adsorption tower 250 adsorption cleaning directs out portion's airborne release,
VOC concentration in discharge gas is maintained at≤120mg/Nm3.Equipped with 700kg anhydrous calcium chloride in adsorption tower 250.Work as solvent-borne type
Coating is prepared in workshop 100 after 800 tons of solvent based coatings of production, and the anhydrous calcium chloride in adsorption tower 250 basically reaches saturated.
At this moment, 700kg anhydrous calcium chloride is all released from adsorption tower 250, then loads new anhydrous calcium chloride to adsorption tower 250.
Claims (10)
1. solvent based coating volatile pollutants processing method, in solvent based coating preparation or coating process, produced air is dirty
Dye administer, itself particularly as follows:
The solvent based coating volatile pollutants (500) utilizing gas dispatch equipment to be produced by said process causes suction through the passage of closing
Attached tower (250), makes described volatile pollutants enter in adsorption tower (250) from the entrance of adsorption tower (250) and fills out through absorption
The adsorption cleaning of material (251) discharges purified gas from the outlet of adsorption tower (250) after processing again；Wherein
Described adsorption stuffing (251) uses activated carbon, and periodically the activated carbon after a period of time will be used from adsorption tower (250)
Reinstalling this adsorption tower (250) after discharging and carrying out Regeneration Treatment to recycle, the step of regenerating active carbon technique includes:
1) mix to dissolve with this organic solvent by the activated carbon that need to regenerate and an organic solvent and replace the VOC of absorption on activated carbon,
Then mechanical separation activated carbon and organic solvent；
2) activated carbon mass percentage concentration mechanical separation gone out is 1～the NaOH aqueous solution of 2% or KOH aqueous solution are carried out clearly
Wash；
3) after saponification, activated carbon is washed, leach after by activated carbon weight/activator weight equal to (10～18)/1
Ratio adds activator in activated carbon, and described activator and activated carbon is sufficiently mixed and reacts 7～10 hours；
4) activated carbon is washed, leach and is dried after reaction, obtain the activated carbon after regeneration；
Wherein, described activator is by terms of ammonium 0.5～1% ammonium salt, 4～10% phosphoric acid, 1～5% oxalic acid of weight of weight of weight
And the deionized water of remainder weight mixes.
2. solvent based coating volatile pollutants processing method as claimed in claim 1, it is characterised in that: regenerating active carbon technique
Step 1) in use C9 aromatic as described organic solvent.
3. solvent based coating volatile pollutants processing method as claimed in claim 1, it is characterised in that: described activator by 2～
The ammonium chloride of 3% weight, 5～7% weight phosphoric acid, 1～3% weight oxalic acid and the deionized water of remaining weight mix.
4. solvent based coating volatile pollutants processing method as claimed in claim 3, it is characterised in that: described activator by
The deionized water of the ammonium chloride of 2% weight, the phosphoric acid of 5% weight, the oxalic acid of 2% weight and remaining weight mixes.
5. solvent based coating volatile pollutants processing method as claimed in claim 1, it is characterised in that: regenerating active carbon technique
Step 4) in take to add water in reacted mixture adjust pH value to 6.5～7 then stirring realize the washing of activated carbon.
6. solvent based coating volatile pollutants processing method as claimed in claim 1, it is characterised in that: first by described volatilization dirt
It is interior to collect wherein entrained solid granule that dye thing introduces a mechanical dust collector (240), the most again by this mechanical dust collector (240)
Expellant gas introduces adsorption tower (250)；Described mechanical dust collector (240) has by from this mechanical dust collector (240)
The diffusion structure that spreads bottom cleaner unit of gas that air inlet enters and be positioned at above diffusion structure for stopping in gas
The barrier structure that solid particle flows up, has the gas channel (243) of bending, institute between described diffusion structure and barrier structure
Mechanical dust collector (240) the air vent conducting stating gas channel (243) and be positioned at above barrier structure.
7. solvent based coating volatile pollutants processing method as claimed in claim 6, it is characterised in that: described diffusion structure bag
Including diffusion shell (241), the top of diffusion shell (241) is provided with upwardly extending air inlet pipe (244)；Described barrier structure includes
Being trapped among the annular cover plate (242) that air inlet pipe (244) is outside, the outward flange of this annular cover plate (242) extends to mechanical dust collector
(240) inwall, the gap between inner port edge and the diffusion structure of annular cover plate (242) forms gas channel (243).
8. solvent based coating volatile pollutants processing method as claimed in claim 6, it is characterised in that: described barrier structure bag
Including the most spaced at least two-layer baffle plate, every layer of baffle plate includes the stripe board (245) of some pieces of horizontal positioned, adjacent two layers
Stripe board (245) between baffle plate is in interlaced arrangement.
9. solvent based coating volatile pollutants processing method as claimed in claim 8, it is characterised in that: described stripe board (245)
Cross section be arch upward.
10. solvent based coating volatile pollutants processing method as claimed in claim 1, it is characterised in that: described adsorption tower (250)
Inside it is provided with the first absorbing unit (250a) and the second absorbing unit (250b) that can independently load and unload adsorption stuffing (251),
Adsorption stuffing (251) in first absorbing unit (250a) and the second absorbing unit (250b) is successively regenerated, when right
When the adsorption stuffing (251) of one of them absorbing unit regenerates, another absorbing unit works on.
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| CN102335668A (en) * | 2010-07-19 | 2012-02-01 | 车磊 | Method for treating industrial hazardous wastes containing organic solvent |
| WO2012134415A1 (en) * | 2011-01-07 | 2012-10-04 | University Of Akron | Low cost immobilized amine regenerable solid sorbents |
| CN203695293U (en) * | 2013-12-05 | 2014-07-09 | 江苏鸿捷环保工程有限公司 | Spray booth for exhaust gas ozone treatment |
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| CN102335668A (en) * | 2010-07-19 | 2012-02-01 | 车磊 | Method for treating industrial hazardous wastes containing organic solvent |
| WO2012134415A1 (en) * | 2011-01-07 | 2012-10-04 | University Of Akron | Low cost immobilized amine regenerable solid sorbents |
| CN203695293U (en) * | 2013-12-05 | 2014-07-09 | 江苏鸿捷环保工程有限公司 | Spray booth for exhaust gas ozone treatment |
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Address after: 611731 No. 3, new air route, West Zone, hi tech Zone, Sichuan, Chengdu Patentee after: Chengdu color star Polytron Technologies Inc. Address before: 611731 No. 3, new air route, West Zone, hi tech Zone, Sichuan, Chengdu Patentee before: CHENGDU STAR TECHNOLOGY INDUSTRIAL Co.,Ltd. |
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Effective date of registration: 20230111 Address after: 611500 No. 3, Yangheng 6th Line, Yang'an Industrial Park, Qionglai City, Chengdu, Sichuan Province Patentee after: Chengdu Caixing Chemical Co.,Ltd. Address before: 611731 No.3, Xinhang Road, West Park, high tech Zone, Chengdu, Sichuan Patentee before: Chengdu color star Polytron Technologies Inc. |