CN106390672A - Method of recycling dichloromethane in waste gas - Google Patents
Method of recycling dichloromethane in waste gas Download PDFInfo
- Publication number
- CN106390672A CN106390672A CN201611002814.4A CN201611002814A CN106390672A CN 106390672 A CN106390672 A CN 106390672A CN 201611002814 A CN201611002814 A CN 201611002814A CN 106390672 A CN106390672 A CN 106390672A
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- Prior art keywords
- dichloromethane
- waste gas
- molecular sieve
- method reclaiming
- gas according
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/38—Separation; Purification; Stabilisation; Use of additives
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/38—Separation; Purification; Stabilisation; Use of additives
- C07C17/389—Separation; Purification; Stabilisation; Use of additives by adsorption on solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/116—Molecular sieves other than zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/704—Solvents not covered by groups B01D2257/702 - B01D2257/7027
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a method of recycling dichloromethane in waste gas. The method includes following steps: step 1, subjecting discharged waste gas containing dichloromethane to secondary condensing; step 2, discharging the waste gas after secondary condensing separation into a molecular sieve adsorber; step 3, feeding water vapor into a molecular sieve, desorbing out dichloromethane, using hot air to regenerate the molecular sieve adsorber after desorbing, and using cold air to lower temperature for standby use, wherein regeneration temperature is 120-180 DEG C, and regeneration pressure is normal pressure; step 4, subjecting a mixed water-gas substance of dichloromethane which is desorbed out and the water vapor to condensing by a tertiary condenser to obtain a mixture of dichloromethane and water, and performing static stratifying to obtain dichloromethane. The method is simple in whole process, convenient to realize and capable of improving recycling efficiency of dichloromethane when being applied.
Description
Technical field
The present invention relates to waste gas recovery technology, specifically a kind of method reclaiming dichloromethane in waste gas.
Background technology
Dichloromethane is non-flammable low boiling point solvent, purposes quite varied due to its low boiling point, in the industrial production very
Readily volatilized, cause the recovery method of dichloromethane in environmental pollution and the raw material existing waste gas of loss mainly to have condensation method
Solvent absorption active carbon adsorption condensing solvent absorption process condensation method is by below waste gas condensation to dichloromethane boiling point
Or lower, recycling design absorption process is with high compared with dichloromethane boiling point molten in addition to make dichloromethane condense into liquid by gaseous state
Agent is absorbing the dichloromethane in waste gas, then the method separation dichloromethane by distillation and solvent activity carbon adsorption are to use
The absorption property of activated carbon is adsorbing the dichloromethane in waste gas, then to reclaim dichloromethane condensing solvent by desorption and inhale
Receipts method is the group technology of condensation method and solvent absorption.During said method application, organic efficiency is all relatively low, how to lift dichloro
The organic efficiency of methane, this becomes current people's question of common concern, but does not have corresponding technique now, also has no related
Report.
Content of the invention
It is an object of the invention to overcoming the deficiencies in the prior art, there is provided the side of dichloromethane in a kind of recovery waste gas
Method, can lift the organic efficiency of dichloromethane during its application.
The present invention solves the above problems and is achieved through the following technical solutions：The side of dichloromethane in a kind of recovery waste gas
Method, comprises the following steps：
Step one, by discharge the waste gas containing dichloromethane carry out B-grade condensation；
Step 2, by B-grade condensation separate after the waste gas containing dichloromethane enter molecular sieve adsorber；
Step 3, in molecular sieve, it is passed through vapor, desorbs dichloromethane, by the molecular sieve adsorber hot-air after desorption
After regeneration, cold air cooling is stand-by, wherein, 120～180 DEG C of regeneration temperature, regeneration pressure is normal pressure；
Step 4, by the dichloromethane desorbing and vapor mixing aqueous vapor thing through three-level condenser condense, obtain dichloromethane
With the mixture of water, obtain dichloromethane through static layering.
Further, in described step one, first order condensation temperature is 5～10 DEG C, and second level condensation temperature is 0～-20
℃.
Further, in described step one, the condensator outlet of condensed in two stages all has the cold well separator with trap, uses
In reclaim condensation and separation of dichloromethane.
Further, in described step 2 molecular sieve adsorber adsorption temp be -20～30 DEG C, adsorptive pressure be 0～
0.1MPa
Further, 60～120 DEG C of desorption temperature in described step 3, desorption pressures are normal pressure.
Further, in described step 4, static layering automatically controls layering using level meters
Further, the quantity of described molecular sieve adsorber is two, and one is used for adsorbing, and another is used for desorbing and regenerates.
In sum, the invention has the advantages that：Inhaled using multi-stage condensing molecular sieve during present invention application
The group technology that water vapor desorption condensation is reclaimed, integrated artistic step is simple, facilitates implementation, low cost, by two
Chloromethanes substep reclaims, and can lift the organic efficiency of dichloromethane, easy to utilize.
Specific embodiment
For making the object, technical solutions and advantages of the present invention become more apparent, with reference to embodiment, the present invention is made
Further detailed description, the exemplary embodiment of the present invention and its explanation are only used for explaining the present invention, are not intended as to this
The restriction of invention.
Embodiment：
This enforcement adopts two molecular sieve adsorbers to reclaim dichloromethane, specifically includes following steps during the present embodiment application：
The first order condenses：Waste gas sends into first order condenser through pipeline, waste gas is cooled to 5 DEG C, makes gaseous dichloromethane portion
Divide and be condensed into liquid, isolate dichloromethane through the cold well with trap, now, the dichloromethane rate of recovery is 50%.
The second level condenses：The waste gas isolated from Leng Jing enters second level condenser, waste gas is cooled to -10 DEG C, makes gas
The dichloromethane fractions of state are condensed into liquid, isolate dichloromethane through the cold well with trap, now, the dichloromethane rate of recovery
18%.
Adsorption-desorption regeneration cycle：The waste gas isolated from Leng Jing enters the first molecular sieve adsorber, waste gas by under
To on by molecular sieve, by molecular sieve adsorption under the dichloromethane normal pressure in waste gas.After molecular sieve adsorption saturation, it is switched to
Two molecular sieve adsorber absorption, the first molecular sieve adsorber carries out desorbing, regenerates, stand-by after finishing.When the second molecular sieve adsorption
After device adsorption saturation, it is switched to the first molecular sieve adsorber absorption, the second molecular sieve adsorber carries out desorbing, regenerates, such shape
Become the adsorption-desorption regeneration cycle of dual adsorber.
Desorption：Enter 105 DEG C of vapor desorption from the first molecular sieve adsorber top, desorption gas-vapor mix is discharged in bottom
Air-water mixture is condensed to 5 DEG C through three-level condenser by thing, and condensate liquid and gas enter standing separation device.
Regeneration：Enter 180 DEG C of hot-air from the first molecular sieve adsorber top, regeneration gas is discharged in bottom, through B-grade condensation
After empty, condensate liquid is discharged to standing separation device.After the completion of desorption, then enter cold air from the first molecular sieve adsorber top and will adsorb
Device cools to 20 DEG C.
Standing separation：Water in standing separation device and dichloromethane mixed liquor, because dichloromethane density ratio water greatly and not
It is dissolved in water, under the control of level meters, discharge dichloromethane from standing separation device bottom, water is discharged on top, gas is from standing point
From the condensed rear discharge in device top.
During the present embodiment application, the absorption phase dichloromethane rate of recovery 31%, overall recovery 99%.
Above-described specific embodiment, has been carried out to the purpose of the present invention, technical scheme and beneficial effect further
Describe in detail, be should be understood that the specific embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvement within the spirit and principles in the present invention, done etc., all should comprise
Within protection scope of the present invention.
Claims (5)
1. a kind of method reclaiming dichloromethane in waste gas is it is characterised in that comprise the following steps：
Step one, by discharge the waste gas containing dichloromethane carry out B-grade condensation；
Step 2, by B-grade condensation separate after the waste gas containing dichloromethane enter molecular sieve adsorber；
Step 3, in molecular sieve, it is passed through vapor, desorbs dichloromethane, by the molecular sieve adsorber hot-air after desorption
After regeneration, cold air cooling is stand-by, wherein, 120～180 DEG C of regeneration temperature, regeneration pressure is normal pressure；
Step 4, by the dichloromethane desorbing and vapor mixing aqueous vapor thing through three-level condenser condense, obtain dichloromethane
With the mixture of water, obtain dichloromethane through static layering.
2. a kind of method reclaiming dichloromethane in waste gas according to claim 1 is it is characterised in that in described step one
First order condensation temperature is 5～10 DEG C, and second level condensation temperature is 0～-20 DEG C.
3. a kind of method reclaiming dichloromethane in waste gas according to claim 1 is it is characterised in that in described step one
The condensator outlet of condensed in two stages all has the cold well separator with trap, for reclaim condensation and separation of dichloromethane.
4. a kind of method reclaiming dichloromethane in waste gas according to claim 1 is it is characterised in that in described step 2
The adsorption temp of molecular sieve adsorber is -20～30 DEG C, and adsorptive pressure is 0～0.1MPa
A kind of method reclaiming dichloromethane in waste gas according to claim 1 is it is characterised in that solve in described step 3
Inhale 60～120 DEG C of temperature, desorption pressures are normal pressure.
5. a kind of method reclaiming dichloromethane in waste gas according to claim 1 is it is characterised in that in described step 4
Static layering automatically controls layering using level meters
A kind of method reclaiming dichloromethane in waste gas according to claim 1 is it is characterised in that described molecular sieve adsorption
The quantity of device is two, and one is used for adsorbing, and another is used for desorbing and regenerates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611002814.4A CN106390672A (en) | 2016-11-15 | 2016-11-15 | Method of recycling dichloromethane in waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611002814.4A CN106390672A (en) | 2016-11-15 | 2016-11-15 | Method of recycling dichloromethane in waste gas |
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| Publication Number | Publication Date |
|---|---|
| CN106390672A true CN106390672A (en) | 2017-02-15 |
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ID=59230440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611002814.4A Withdrawn CN106390672A (en) | 2016-11-15 | 2016-11-15 | Method of recycling dichloromethane in waste gas |
Country Status (1)
| Country | Link |
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| CN (1) | CN106390672A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106902612A (en) * | 2017-04-20 | 2017-06-30 | 成都亨通兆业精密机械有限公司 | A kind of technique that dichloromethane is separated in the terminal from oil-gas transportation |
| CN106966858A (en) * | 2017-04-20 | 2017-07-21 | 成都亨通兆业精密机械有限公司 | A kind of technique for being used in Oil/gas Well waste gas separate dichloromethane |
| CN108211650A (en) * | 2018-03-14 | 2018-06-29 | 铜仁学院 | A kind of new process that dichloromethane is recycled from exhaust gas |
| CN108339370A (en) * | 2018-01-09 | 2018-07-31 | 浙江东天虹环保工程有限公司 | A kind of high concentration dichloromethane waste gas recovery reuse method and system |
| 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 |
| CN109012563A (en) * | 2018-08-08 | 2018-12-18 | 东南大学 | The black phosphorus alkene and the preparation method and application thereof of metal Ti modification |
| CN110124437A (en) * | 2019-05-14 | 2019-08-16 | 深圳市华尔信环保科技有限公司 | A kind of purification of methylene chloride and recovery method and system |
| CN111054183A (en) * | 2019-12-27 | 2020-04-24 | 中材锂膜有限公司 | Waste gas recovery process in wet lithium battery diaphragm production process |
| CN115228233A (en) * | 2022-07-15 | 2022-10-25 | 深圳市瑞秋卡森环保科技有限公司 | Method for recovering dichloromethane waste gas |
-
2016
- 2016-11-15 CN CN201611002814.4A patent/CN106390672A/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106902612A (en) * | 2017-04-20 | 2017-06-30 | 成都亨通兆业精密机械有限公司 | A kind of technique that dichloromethane is separated in the terminal from oil-gas transportation |
| CN106966858A (en) * | 2017-04-20 | 2017-07-21 | 成都亨通兆业精密机械有限公司 | A kind of technique for being used in Oil/gas Well waste gas separate dichloromethane |
| CN108339370A (en) * | 2018-01-09 | 2018-07-31 | 浙江东天虹环保工程有限公司 | A kind of high concentration dichloromethane waste gas recovery reuse method and system |
| CN108211650A (en) * | 2018-03-14 | 2018-06-29 | 铜仁学院 | A kind of new process that dichloromethane is recycled from exhaust gas |
| 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 |
| CN109012563A (en) * | 2018-08-08 | 2018-12-18 | 东南大学 | The black phosphorus alkene and the preparation method and application thereof of metal Ti modification |
| CN109012563B (en) * | 2018-08-08 | 2021-06-01 | 东南大学 | Metal Ti modified black phosphorus alkene and preparation method and application thereof |
| CN110124437A (en) * | 2019-05-14 | 2019-08-16 | 深圳市华尔信环保科技有限公司 | A kind of purification of methylene chloride and recovery method and system |
| CN111054183A (en) * | 2019-12-27 | 2020-04-24 | 中材锂膜有限公司 | Waste gas recovery process in wet lithium battery diaphragm production process |
| CN115228233A (en) * | 2022-07-15 | 2022-10-25 | 深圳市瑞秋卡森环保科技有限公司 | Method for recovering dichloromethane waste gas |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170215 |
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| WW01 | Invention patent application withdrawn after publication |