CN107008103A - A kind of method of volatile chlorinated hydrocarbon in physical absorption abjection gas phase - Google Patents
A kind of method of volatile chlorinated hydrocarbon in physical absorption abjection gas phase Download PDFInfo
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- CN107008103A CN107008103A CN201710311114.1A CN201710311114A CN107008103A CN 107008103 A CN107008103 A CN 107008103A CN 201710311114 A CN201710311114 A CN 201710311114A CN 107008103 A CN107008103 A CN 107008103A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/02—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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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
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- B01J20/30—Processes for preparing, regenerating, or reactivating
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- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3458—Regenerating or reactivating using a particular desorbing compound or mixture in the gas phase
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Abstract
The present invention relates to the method for volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase, adsorbent is used as using molecular sieve, volatile chlorinated hydrocarbon in gas phase is transferred to solid phase and separated from gas phase after being adsorbed, after molecular sieve adsorption saturation, it can be regenerated using the method for thermal desorption, reach the purpose of recycling.Compared with prior art, molecular sieve has that chlorohydrocarbon adsorbance is big, renovation process simple, the advantage that can be used repeatedly, and can be widely applied to the abjection of volatile chlorinated hydrocarbon in the toxic gas of soil remediation process generation.
Description
Technical field
The invention belongs to environment remediation field, volatile chlorinated hydrocarbon in gas phase is deviate from more particularly, to a kind of physical absorption
Method.
Background technology
Volatile chlorinated hydrocarbon (VCHs) is the general name of a class volatile chlorinated hydrocarbon class, and relatively common has chloromethane, chlorine
For ethane, chloroethylenes, chloro-propane etc..Volatile chlorinated hydrocarbon has big density, low boiling point, viscosity is small, be insoluble in the spies such as water
Property, be industrially widely used, if but using, preserve, managing improperly in processing procedure is easily advanced into environment, mesh
Before have resulted in big gas and water, the soil pollution of large area.Into the volatile chlorinated hydrocarbon in environment due to " three cause effect ",
There is great harmfulness to human health and the ecosystem.
The problem of environmental pollution of volatile chlorinated hydrocarbon causes the great attention of people, and this pollutant is always that various countries are preferential
The pollutant of control, has developed a variety of Treatment process at present.Wherein, in gas phase volatile chlorinated hydrocarbon pollutant processing skill
Art can be divided into the non-destructive method that absorption, absorption, condensation etc. are reclaimed using physical method, and by directly burning,
The chemical reactions such as photocatalytic degradation, plasma degradation and catalysis combustion are degraded to nontoxic or low toxicity material disruptive method
Two major classes, these methods are used for the processing for the chlorohydrocarbon that soil remediation scene is volatilized from soil, as soil remediation work
Unit operation in skill.
Chinese patent 201210038607.X discloses a kind of Organically-pollutedsoil soil remediation method, and the technical method is applied to
The place soil polluted by volatility or semi-volatile organic matter is repaired, such as by benzene homologues, chlorinated hydrocarbon, gasoline, TVOC dirts
The soil of dye.This method includes four systemses：1. steam injected system, 2. soil extraction system, 3. monitoring system, 4. ground give up
Volatile organic matter in gas Waste Water Treatment, gas phase is removed by activated carbon adsorber or high-temperature S removal stove, is realized
Qualified discharge, but the post-processing approach of adsorption saturation activated carbon is not announced.
Patent 201310381198.8 discloses the in-situ thermal desorption treatment technology and system of a kind of contaminated soil, using adding
After hot systems heat air, it is injected into by heated well in soil；Soil is added into certain temperature enables organic pollution
Volatilization, separation are decomposed；By being sucked by vacuum the pollution air that well is pumped out, boiler is directly entered according to the difference of pollutant
Burn or otherwise handled, the processing method has the shortcomings that energy consumption is big.
Chinese patent 200810151889.8, which discloses a kind of showering, has the system of volatility organic polluted soil
And method, the tail gas that the processing system is produced first passes through solvent tank and absorbed, and remainder is burned in entrance incinerator,
Process is complicated.
Chinese patent 200910030305.6 discloses a kind of soil pollution thermal desorption restoration processing system, the tail being desorbed out
Flash Gas Compression Skid System is made up of deduster and alkali liquor absorption tower, and absorption efficiency is low, and waste liquid yield is big.
Patent 201210013006 discloses a kind of prosthetic appliance of effumability contaminated soil, including by pipeline and draws
Combustor, combustion chamber, soil treatment system, oxidation reaction pond, activated carbon adsorber and chimney that blower fan is sequentially connected in series.The reparation
Device structure is simple, heat utilization rate is high, and tail gas is handled in combination with chemical method
The features such as catalysis burning has low treatment temperature, efficiency high, the hot technology as Recent study.Catalyst is pressed
It is different according to active component, it can substantially be divided into noble metal catalyst, catalyst of transition metal oxide and complex rare-earth oxidate containing valuable metal
Catalyst three major types.But exist dechlorination not thoroughly, generation secondary pollution, active component are easy to run off, catalyst inactivation etc. lacks
Point, the large-scale application of the technology needs time.So far, it yet there are no with volatile chlorinated hydrocarbon in molecular sieve adsorption gas phase
Report.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of physical absorption abjection
The method of volatile chlorinated hydrocarbon in gas phase.
The purpose of the present invention can be achieved through the following technical solutions：
The method of volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase, using molecular sieve as adsorbent, in gas phase
Volatile chlorinated hydrocarbon it is adsorbed after be transferred to solid phase and from gas phase separation, the abjection process can be realized by following steps：
(1) weigh molecular sieve to be placed in ADSORPTION IN A FIXED BED pipe, be passed through dry gas, to the molecular sieve at 100~700 DEG C
Pretreatment 0.5~5 hour is dried, the free moisture in molecular sieve is removed；
(2) after molecular sieve is cooled to environment temperature, the gas containing volatile chlorinated hydrocarbon is passed through, mass space velocity is
1000h-1~100000h-1, the flow of gas is controlled with flowmeter, sample point, periodic detection tail gas are set at offgas outlet
The content of middle volatile chlorinated hydrocarbon, after content exceeds the discharge standard of volatile chlorinated hydrocarbon in air, pending containing is waved
The gas of hair property chlorohydrocarbon is passed through in another adsorption tube equipped with dry molecular sieves adsorbent and continued with, and completes in gas phase
The absorption of volatile chlorinated hydrocarbon.
Described molecular sieve is zeolite molecular sieve, can be one kind or several in the zeolite molecular sieve of following concrete component
Kind, it is specific as follows：
Described zeolite molecular sieve is naturally occurring or artificial synthesized with specific three-D pore structure or stratiform knot
The alumino-silicate of structure, including A type molecular sieve, X-type molecular sieve, Y type molecular sieve, ZSM-5 molecular sieve, modenite or pillared illiteracy are de-
Soil.
As preferred embodiment, can from absorption dichloromethane 5A molecular sieves, absorption trichloro ethylene, four chloroethenes
The 13X molecular sieves or absorption trichloro ethylene, the NaY molecular sieve of carbon tetrachloride of alkene.
Due to volatile chlorinated hydrocarbon include scope it is larger, existing (such as dichloromethane, four chlorinations containing single carbon atom
Carbon), also have containing more than two and two carbon atoms, therefore the kinetic diameter difference of each molecule is very big, it is necessary to according to not
Suitable adsorbent is chosen with pollutant.Traditional micro-pore zeolite molecular sieve, such as Y types, MFI type, MOR types, X-type,
Beta (β) type, FER types, SAPO-34 molecular sieves etc. are preferable to the small molecule chlorohydrocarbon adsorption effect such as dichloromethane, carbon tetrachloride；
And the mesoporous molecular sieve such as MCM-41, MCM-48 is preferable to the adsorption effect of the bigger molecules such as trichloro ethylene, 1,2,3- trichloropropanes.
As preferred embodiment, it can be divided from the 13X molecular sieves of absorption trichloro ethylene, the HY of absorption carbon tetrachloride
The H beta-molecular sieves of son sieve or absorption trichloroethanes.
Because the composition of the volatile chlorinated hydrocarbon in actual dusty gas varies, when both containing in gas phase such as dichloromethane
Micro-molecular gas as alkane, and during containing the molecule that trichloro ethylene is so unsaturated and volume is larger, can use existing micro-
There is in mesopore-micro porous molecular sieve in hole again, and the content always according to gas is mixed according to a certain percentage to above-mentioned each molecular sieve,
To mix optimal adsorbent.
In order to further cost-effective, suit measures to local conditions, under conditions of processing requirement is met, adsorbent also may be selected to be claimed
For two-dimensional molecular sieve montmorillonite, bentonite, carclazyte or by these stratified material inorganic material modify gained pillared montmorillonite.
In order to adjust the resistance of the gas in adsorption process, also Al can be added in previous molecular sieve2O3、SiO2Or clay
Deng material, the mass percent of zeolite molecular sieve in the mixture is more than 50%.
Described dry gas is N2, Ar, CO2Or other inert gases.
Described volatile chlorinated hydrocarbon is dichloromethane, chloroform, carbon tetrachloride, 1,1- dichloroethanes, 1,1,1- tri-
Chloroethanes, 1,1,2- trichloroethanes, trichloro ethylene, tetrachloro-ethylene, 1,1,2,2- tetrachloroethanes, 1,1,1,2- tetrachloroethanes, 1,
One kind in 2- dichloropropanes, 1,2,3- trichloropropanes or they formed gaseous mixture is mixed with arbitrary proportion, in gas
Content be 1ppm~100%.
The gas that step (2) is passed through is O2、N2, air, water vapour, CO2, organic vapor or other inert gases.
The molecular sieve of adsorption saturation (100~700 DEG C) can be passed through N under conditions of heating2, Ar, CO2Or other inertia
Gas, is purged, and is taken off and is regenerated after chlorohydrocarbon, the gas of desorption can be focused on by exhaust gas processing device, effectively reduction
Energy-output ratio.
Use in the prior art by carrier-supported precious metal of molecular sieve, transition metal isoreactivity component is prepared into and urged
Change the case that material is catalyst combination catalytic oxidation technologies degraded volatile chlorinated hydrocarbon, volatile chlorinated hydrocarbon generation H2O、HCl、
CO2Deng.It is exactly that volatile chlorinated hydrocarbon is adsorbed on its surface, further first with the adsorption function of molecular sieve in this process
Reacted with active metal component in the range of 250 DEG C -350 DEG C of temperature.
Compared with prior art, the present invention is adsorbed volatile chlorinated hydrocarbon in molecule only with the first step in said process
Sieving surface, then couple desorption means makes volatile chlorinated hydrocarbon recycling, makes public for the first time the molecular sieve adsorption of our developments
The Experiment Result of volatile chlorinated hydrocarbon, its effect is substantially better than the conventional adsorbents such as carbo lignius, ature of coal charcoal and coconut husk charcoal, and divides
Son sieve renovation process is simple, is especially suitable for replacing activated carbon to be used for the de- of volatile chlorinated hydrocarbon in the gas phase at soil remediation scene
Go out, whole process is economic and environment-friendly, belong to molecular sieve pioneering and inventing using technology.
Brief description of the drawings
Fig. 1 is CH on the molecular sieve that uses in embodiment 12Cl2Extrusion rate changes over time figure；
Fig. 2 is CCl on the molecular sieve that uses in embodiment 24Extrusion rate changes over time figure；
Fig. 3 is CCl on the molecular sieve that uses in embodiment 34Extrusion rate changes over time figure；
Fig. 4 is C on the molecular sieve that uses in embodiment 42HCl3Extrusion rate changes over time figure；
Fig. 5 is C on the molecular sieve that uses in embodiment 52Cl4Extrusion rate changes over time figure；
Fig. 6 is CH on 3 kinds of activated carbons using in embodiment 72Cl2Extrusion rate changes over time the figure (contrast with molecular sieve
Example)；
Fig. 7 is C on 3 kinds of activated carbons using in embodiment 82HCl3Extrusion rate changes over time the figure (contrast with molecular sieve
Example)；
Fig. 8 is C on the 13X molecular sieves after being regenerated in embodiment 92HCl3Extrusion rate changes over time figure.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.Following examples will be helpful to this area
Technical staff further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the general of this area
For logical technical staff, without departing from the inventive concept of the premise, various modifications and improvements can be made.These are belonged to
Protection scope of the present invention.
Embodiment 1
0.2g (tabletting screening is 20~40 mesh) molecular sieve (5A, 13X, NaY) is placed in quartzy ADSORPTION IN A FIXED BED pipe,
Pure N is passed through at 500 DEG C240min is pre-processed to the zeolite, to remove moisture therein.Bed temperature is down to 30 DEG C, in the temperature
By CH under degree2Cl2Concentration be 1200ppm CH2Cl2/N2Mixed gas is passed into adsorption tube with 100ml/min flow velocity
The adsorption curve that row absorption is obtained is as shown in Figure 1.As a result show, 13X molecular sieves and 5A molecular sieves are to CH2Cl2With preferable abjection
Effect, particularly 5A molecular sieves are in 2.5h to CH2Cl2Extrusion rate is up to more than 99%.
Embodiment 2
Embodiment 1 is repeated, adsorbate is changed to CCl4Concentration be 1010ppm CCl4/N2Mixed gas is with same
Flow velocity be passed into adsorption tube and carry out adsorbing obtained adsorption curve as shown in Figure 2.As a result show, 13X molecular sieves are to CCl4
With preferable abjection effect, 2h is interior to CCl4Extrusion rate is up to more than 99%.
Embodiment 3
Embodiment 2 is repeated, one kind adsorbent being replaced by montmorillonite, bentonite or carclazyte is tested, and is obtained
Adsorption curve is as shown in Figure 3.As a result show, montmorillonite is to CCl4With preferable abjection effect, 1h is interior to CCl4Extrusion rate is reachable
More than 99%.
Embodiment 4
Embodiment 1 is repeated, adsorbate is changed to C2HCl3Concentration be 800ppm C2HCl3/N2Mixed gas is with same
The flow velocity of sample, which is passed into adsorption tube, carries out adsorbing obtained adsorption curve as shown in Figure 4.As a result show, NaY molecular sieve pair
C2HCl3With effect is preferably deviate from relatively, 1.5h is interior to C2HCl3Extrusion rate is up to more than 99%.
Embodiment 5
Embodiment 1 is repeated, adsorbent is changed to MCM-22 (or MCM-48), C is passed through2Cl4Concentration for 720ppm
C2Cl4/N2Mixed gas is passed into adsorption tube with same flow velocity carries out adsorbing obtained adsorption curve as shown in Figure 5.As a result
Show, the two is to C2Cl4With preferable abjection effect, particularly MCM-22 in 5h to C2Cl4Extrusion rate up to 99% with
On.
Embodiment 6
Embodiment 1 is repeated, it is respectively 1 that adsorbent is changed into mass ratio:1 and 2:1 ZSM-5 and SiO2Mixture, is passed through
1,1,1-C2H3Cl3Concentration be 1000ppm 1,1,1-C2H3Cl3/N2Mixed gas is passed into adsorption tube with same flow velocity
It is middle to be adsorbed, wherein 1,1,1-C on previous adsorbent2H3Cl3Initial extrusion rate be 35%, 1,1,1- on latter adsorbent
C2H3Cl3Initial extrusion rate be 52%.
Embodiment 7
Embodiment 1 is repeated, is respectively adsorbent from ature of coal charcoal, carbo lignius and fruit shell carbon, in N before absorption2Under protection
Handle 2h at 120 DEG C, it is same as Example 1 under conditions of carry out absorption CH2Cl2Experiment, its result is with 5A, 13X and NaY to such as Fig. 6
It is shown.As a result show, molecular sieve is compared with activated carbon to CH2Cl2It is right in 2.5h with more preferable abjection effect, particularly 13X
CH2Cl2Extrusion rate is up to more than 99%.
Embodiment 8
Embodiment 4 is repeated, is respectively adsorbent from ature of coal charcoal, carbo lignius and fruit shell carbon, in N before absorption2Under protection
Handle 2h at 120 DEG C, it is same as Example 3 under conditions of carry out absorption C2HCl3Experiment, its result and NaY contrasts are as shown in Figure 7.Knot
Fruit shows that molecular sieve is compared with activated carbon to C2HCl3With more preferable abjection effect, particularly NaY after 6h to C2HCl3Absorption
Just reach saturation.
Embodiment 9
Embodiment 2 is repeated, the 13X molecular sieves original position of adsorption saturation is passed through N2400 DEG C are warming up to 5 DEG C/min speed
(activation) 2h is desorbed, the CCl that 30 DEG C of same flow velocitys are passed through same concentrations is then cooled to4/N2, adsorbed.So repeat
3 times, each adsorption curve is as shown in Figure 8.As a result show, 13X molecular sieves have the 13X after fine regenerability, and regeneration
To CCl in 2.5h4Extrusion rate is up to more than 99%.
Patent of the present invention (is industrially used at present based on use molecular sieve as adsorbent adsorbance more than activated carbon
Primary sorbent) and adsorption saturation after can repeatedly regenerative adsorption amount without being decreased obviously this 2 superiority.
Embodiment 7, which is respectively adopted, (proves that the CH2Cl2 saturated extent of adsorption of 5A, 13X and NaY molecular sieve is higher than carbo lignius, coal
Matter charcoal and fruit shell carbon, the wherein adsorbance of 5A molecular sieves be respectively three kinds of activated carbons 3.6,3.4,3.2 times) and (card of embodiment 8
The C2HCl3 saturated extent of adsorption of bright NaY molecular sieve is higher than carbo lignius, ature of coal charcoal and fruit shell carbon, and the adsorbance of NaY molecular sieve is distinguished
Be three kinds of activated carbons 2.2,1.8,1.5 times) adsorbance of evidence molecular sieve is higher than activated carbon；
Repeatedly regenerative adsorption amount (13X absorption can be decreased obviously using after the evidence molecular sieve adsorption saturation of embodiment 9
C2HCl3 is reached after saturation, compared with fresh molecular sieve, and saturated extent of adsorption declines 4%, second of regeneration and declined after regenerating for the first time
7%).
Embodiment 10
The method of volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase, using molecular sieve as adsorbent, in gas phase
Volatile chlorinated hydrocarbon it is adsorbed after be transferred to solid phase and from gas phase separation, the abjection process can be realized by following steps：
(1) weigh molecular sieve to be placed in ADSORPTION IN A FIXED BED pipe, be passed through N2, Ar, CO2Or other inert gases are used as dry gas
Body, is pre-processed 5 hours at 100 DEG C to the molecular sieve drying, removes the free moisture in molecular sieve；
(2) after molecular sieve is cooled to environment temperature, it is passed through the O containing volatile chlorinated hydrocarbon2、N2, air, water vapour,
CO2, organic vapor or other inert gases, contained volatile chlorinated hydrocarbon can be dichloromethane, chloroform, four chlorinations
Carbon, 1,1- dichloroethanes, 1,1,1- trichloroethanes, 1,1,2- trichloroethanes, trichloro ethylene, tetrachloro-ethylene, 1,1,2,2- tetrachloro
Ethane, 1,1,1,2- tetrachloroethanes, 1,2- dichloropropanes, one kind in 1,2,3- trichloropropanes or they mixed with arbitrary proportion
The gaseous mixture formed, the content in gas is 1ppm, and mass space velocity is 1000h-1, the flow of gas is controlled with flowmeter,
The content of volatile chlorinated hydrocarbon in sample point, periodic detection tail gas is set at offgas outlet, volatilized when content exceeds in air
Property chlorohydrocarbon discharge standard after, by the pending gas containing volatile chlorinated hydrocarbon be passed through another equipped with dry molecular sieves inhale
Continued with attached dose of adsorption tube, complete the absorption to volatile chlorinated hydrocarbon in gas phase.
The molecular sieve used is zeolite molecular sieve, is to include A type molecular sieve, X-type molecular sieve, Y type molecules specifically
Sieve, ZSM-5 molecular sieve, modenite or pillared montmorillonite, for example can be from 5A molecular sieves, the absorption three for adsorbing dichloromethane
Vinyl chloride, the 13X molecular sieves of tetrachloro-ethylene or absorption trichloro ethylene, the NaY molecular sieve of carbon tetrachloride.
In addition, zeolite molecular sieve can also use micro-pore zeolite molecular sieve, including Y types, MFI type, MOR types, X-type,
Beta (β) type, FER types or SAPO-34 molecular sieves, for example, using the 13X molecular sieves of absorption trichloro ethylene, absorption carbon tetrachloride
HY molecular sieves or adsorb trichloroethanes H beta-molecular sieves.
Zeolite molecular sieve can also be MCM-41 or MCM-48 mesoporous molecular sieves.Or for two-dimensional molecular sieve montmorillonite,
Bentonite, carclazyte or by these stratified materials with inorganic material modify gained pillared montmorillonite.The molecule selected in the present embodiment
Sieve as 13X molecular sieves.
Embodiment 11
The method of volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase, using molecular sieve as adsorbent, in gas phase
Volatile chlorinated hydrocarbon it is adsorbed after be transferred to solid phase and from gas phase separation, the abjection process can be realized by following steps：
(1) SAPO-34 molecular sieves are weighed, the molecular sieve and Al2O3Coexist, the mass percent of molecular sieve in the mixture
More than 50%, it is placed in ADSORPTION IN A FIXED BED pipe, is passed through dry Ar gas, it is small to molecular sieve drying pretreatment 0.5 at 700 DEG C
When, remove the free moisture in molecular sieve；
(2) after molecular sieve is cooled to environment temperature, the air containing dichloromethane, chloroform, mass space velocity are passed through
For 100000h-1, the flow of gas is controlled with flowmeter, volatility in sample point, periodic detection tail gas is set at offgas outlet
The content of chlorohydrocarbon, after content exceeds the discharge standard of volatile chlorinated hydrocarbon in air, by pending chloro containing volatility
The gas of hydrocarbon is passed through in another adsorption tube equipped with dry molecular sieves adsorbent and continued with, and completes to volatility chlorine in gas phase
For the absorption of hydrocarbon.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (10)
1. a kind of method of volatile chlorinated hydrocarbon in physical absorption abjection gas phase, it is characterised in that absorption is used as using molecular sieve
Volatile chlorinated hydrocarbon in agent, gas phase is transferred to solid phase after being adsorbed and from gas phase separation, the abjection process can pass through following step
It is rapid to realize：
(1) weigh molecular sieve to be placed in ADSORPTION IN A FIXED BED pipe, be passed through dry gas, to the molecular sieve drying at 100~700 DEG C
Pretreatment 0.5~5 hour, removes the free moisture in molecular sieve；
(2) after molecular sieve is cooled to environment temperature, the gas containing volatile chlorinated hydrocarbon is passed through, mass space velocity is 1000h-1~
100000h-1, the flow of gas is controlled with flowmeter, volatility chlorine in sample point, periodic detection tail gas is set at offgas outlet
For the content of hydrocarbon, after content exceeds the discharge standard of volatile chlorinated hydrocarbon in air, pending is contained into volatile chlorinated hydrocarbon
Gas be passed through in another adsorption tube equipped with dry molecular sieves adsorbent and continue with, complete to volatility chloro in gas phase
The absorption of hydrocarbon.
2. the method for volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase according to claim 1, it is characterised in that
Described molecular sieve is zeolite molecular sieve.
3. the method for volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase according to claim 2, it is characterised in that
Described zeolite molecular sieve is the sial with specific three-D pore structure or layer structure naturally occur or artificial synthesized
Hydrochlorate, including A type molecular sieve, X-type molecular sieve, Y type molecular sieve, ZSM-5 molecular sieve, modenite or pillared montmorillonite, preferably
Adsorb 5A molecular sieves, absorption trichloro ethylene, the 13X molecular sieves of tetrachloro-ethylene or absorption trichloro ethylene, four chlorinations of dichloromethane
The NaY molecular sieve of carbon.
4. the method for volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase according to claim 2, it is characterised in that
Described zeolite molecular sieve be micro-pore zeolite molecular sieve, including Y types, MFI type, MOR types, X-type, Beta (β) type, FER types or
SAPO-34 molecular sieves, the 13X molecular sieves for preferably adsorbing trichloro ethylene, three chloroethenes of HY molecular sieves or absorption for adsorbing carbon tetrachloride
The H beta-molecular sieves of alkane.
5. the method for volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase according to claim 2, it is characterised in that
Described zeolite molecular sieve is mesoporous molecular sieve, including MCM-41 or MCM-48 molecular sieves.
6. the method for volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase according to claim 2, it is characterised in that
Described zeolite molecular sieve is repaiied for the montmorillonite of two-dimensional molecular sieve, bentonite, carclazyte or with inorganic material these stratified materials
Decorations gained pillared montmorillonite.
7. the method for volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase according to any one of claim 2-6,
Characterized in that, described zeolite molecular sieve and Al2O3、SiO2Or clay coexists, the quality hundred of zeolite molecular sieve in the mixture
Divide than being more than 50%.
8. the method for volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase according to claim 1, it is characterised in that
Described dry gas is N2, Ar, CO2Or other inert gases.
9. the method for volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase according to claim 1, it is characterised in that
Described volatile chlorinated hydrocarbon be dichloromethane, chloroform, carbon tetrachloride, 1,1- dichloroethanes, 1,1,1- trichloroethanes, 1,
1,2- trichloroethanes, trichloro ethylene, tetrachloro-ethylene, 1,1,2,2- tetrachloroethanes, 1,1,1,2- tetrachloroethanes, 1,2- dichloros third
One kind in alkane, 1,2,3- trichloropropanes or they formed gaseous mixture is mixed with arbitrary proportion, the content in gas is
1ppm~100%.
10. the method for volatile chlorinated hydrocarbon in a kind of physical absorption abjection gas phase according to claim 1, its feature exists
In the gas that step (2) is passed through is O2、N2, air, water vapour, CO2, organic vapor or other inert gases.
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| CN108097206A (en) * | 2017-12-07 | 2018-06-01 | 浙江海洋大学 | A kind of preparation method of adsorbent to small molecule hydro carbons strong adsorption force |
| CN108939794A (en) * | 2018-07-16 | 2018-12-07 | 南通市常海食品添加剂有限公司 | A kind of recovery method of trichloroethane gas |
| CN109806848A (en) * | 2019-03-20 | 2019-05-28 | 江苏同康特种活性炭纤维面料有限公司 | A kind of environment-friendlyactive active carbon fiber exhaust gas adsorbent material and preparation method |
| CN110756160A (en) * | 2019-11-05 | 2020-02-07 | 北京泷涛环境科技有限公司 | Modified molecular sieve, preparation method, material and use method |
| CN110876922A (en) * | 2018-09-06 | 2020-03-13 | 中国石油化工股份有限公司 | Naphtha dechlorination adsorbent and preparation method and application thereof |
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| CN109806848A (en) * | 2019-03-20 | 2019-05-28 | 江苏同康特种活性炭纤维面料有限公司 | A kind of environment-friendlyactive active carbon fiber exhaust gas adsorbent material and preparation method |
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| CN110756160B (en) * | 2019-11-05 | 2022-07-26 | 北京泷涛环境科技有限公司 | Modified molecular sieve, preparation method, material and using method |
| CN112642847A (en) * | 2020-12-25 | 2021-04-13 | 上海勘察设计研究院(集团)有限公司 | Remediation method based on structural evolution of chlorinated hydrocarbon polluted soil |
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