CN104415664B - The inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution - Google Patents
The inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution Download PDFInfo
- Publication number
- CN104415664B CN104415664B CN201310364697.6A CN201310364697A CN104415664B CN 104415664 B CN104415664 B CN 104415664B CN 201310364697 A CN201310364697 A CN 201310364697A CN 104415664 B CN104415664 B CN 104415664B
- Authority
- CN
- China
- Prior art keywords
- ethylene glycol
- concentration
- hollow fiber
- water
- glycol solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a kind of inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution, the concentration purification processes of ethylene glycol solution in ethylene oxide hydration preparing ethylene glycol technique are carried out using inner pressed vacuum membrane distillation technology coupling rectification technology.First, the glycol water of 85 DEG C~100 DEG C or so of temperature is pumped into raw water box；Secondly, the glycol water in raw water box is pumped into the tube side of hollow fiber film assembly by feed pump with specific crossflow velocity；Finally, the per-meate side to hollow fiber film assembly is that shell side is vacuumized, can condensing body condense to form production water by condenser in per-meate side, the denseer ethylene glycol solution in membrane module tube side then return to raw water box circulation concentration.The inventive method is compared with multiple-effect evaporation, with equipment investment is few, treatment effeciency is high, operation temperature is low, operating pressure is low, low power consumption and other advantages.
Description
Technical field
The present invention relates to a kind of method for concentration of ethylene glycol solution in ethylene oxide hydration preparing ethylene glycol technique, more particularly to
A kind of method of utilization film distillation technology concentration ethylene glycol solution, steams more specifically to a kind of inner pressed vacuum diaphragm
Evaporate the method for technology concentration ethylene glycol solution.
Background technology
Current ethylene glycol is mostly produced using oxirane Hydrolyze method, obtained dilute solution of ethylene glycol (mass concentration 15%)
After being concentrated by evaporation through downflow type multiple-effect evaporation tower, solution concentration, which reaches, is approximately equal to 85% (quality), delivers to thick ethylene glycol storage tank.Will
Thick ethylene glycol containing 15% (quality) water, is dehydrated in dehydrating tower, arranges aldehyde, tower bottoms kettle liquid pump is sent to purifying ethylene glycol tower
Middle rectification and purification, produces high-quality ethylene glycol product.
Because the boiling point of water is compared with ethylene glycol low boiling point, so first water must be evaporated from ethylene glycol, current second
Glycol solution is concentrated and purification mode is main based on multiple-effect evaporation and rectifying, and energy consumption is still very high.
Membrane distillation is the hydrophobic membrane technology researched and developed for seawater desalination the eighties in last century, and it is to use microporous hydrophobic membrane,
A kind of Aspect of some new membrane processes by driving force of film both sides steam pressure difference.Membrane distillation is that membrane technology is combined with still-process
Membrane separating process, the film used in it is that is, only steam can enter fenestra not by the dewatering microporous film of pending solution-wet,
Liquid can not pass through fenestra.
Because the inlet temperature that ethylene oxide hydration reacts is 80~150 DEG C, 100 DEG C of the outlet temperature of mixture after reaction
Left and right, the both sides steam of vapor in hydrophobic membrane under conditions of normal pressure, 80~95 DEG C of the ethylene glycol solution containing low concentration
In the presence of partial pressure difference, water can be achieved and is efficiently separated with ethylene glycol, there is lower operation temperature and energy compared with multiple-effect evaporation
Consumption.
Existing Patents and document are although the vacuum diaphragm for referring to a kind of polyatomic alcohol water solution by Maize Production is steamed
Dewatering is evaporated, but its membrane material used is polypropylene（PP）, the phase inner pressed membrane distillation mode of use occurs after concentration
Due to film hydrophilic phenomenon caused by the rise of polyatomic alcohol water solution concentration.As Chinese patent CN101121639A and document are " true
Empty membrane distillation is used for the research that polyatomic alcohol water solution is separated, water technology, 2008,34（1）, 31~33 " all refer to it is a kind of by
The vacuum membrane distillation dewatering of the polyatomic alcohol water solution of Maize Production, involved method uses distillation device, first will
Polyatomic alcohol water solution is heated to 61~65 DEG C of temperature, and polyatomic alcohol water solution then is added into hollow-fibre membrane using raw material pump
It is interior, the formation -0.085MPa~-0.089MPa vacuum environment on the outside of film, so as to be formed in film both sides in transmission vapour pressure, film
Water in the polyatomic alcohol water solution of side enters on the outside of hollow-fibre membrane in the presence of steam pressure difference through fenestra in vapour form, then
Cooling through the condenser system on the outside of membrane module is condensed into water, condensed water is collected, so as to realize the polyalcohol water by Maize Production
The dehydration concentration of solution.Although the patent and document employ film distillation technology processing polyatomic alcohol water solution, the patent and
Document uses inner pressed membrane distillation mode, and membrane material is polypropylene（PP）, concentration the later stage occur in that because polyalcohol is water-soluble
Film hydrophilic phenomenon caused by the rise of liquid concentration.
The content of the invention
In view of the shortcomings of the prior art, the invention discloses a kind of inner pressed vacuum membrane distillation concentration side of ethylene glycol solution
Method, it is desirable to provide a kind of use inner pressed vacuum membrane distillation technology is further concentrated in ethylene oxide hydration preparing ethylene glycol technique
Ethylene glycol solution, further removes the moisture reclaimed in ethylene glycol solution, realizes using the coupling of inner pressed vacuum membrane distillation technology
Distillation technology carries out the concentration purification processes of ethylene glycol solution in ethylene oxide hydration preparing ethylene glycol technique.
The technical solution adopted by the present invention is：
The inner pressed vacuum membrane distillation method for concentration of a kind of ethylene glycol solution, by ethylene oxide hydration preparing ethylene glycol technique
Ethylene glycol solution is concentrated, and is mainly comprised the following steps：
(1) first, glycol water is pumped into raw water box；
(2) secondly, the glycol water in raw water box, by feed pump with specific crossflow velocity, is pumped into hollow
The tube side of fiber film component；
(3) finally, the per-meate side to hollow fiber film assembly is that shell side is vacuumized, under vacuum action, ethylene glycol water
Water vapour in solution etc. passes through fenestra, condenses to form production water by condenser in per-meate side, the denseer second in membrane module tube side
Glycol solution then returns to raw water box circulation concentration, obtains the concentrate of ethylene glycol, is so achieved that glycol water
Concentration and separation purpose.
Glycol water water quality characteristic of the present invention is：Monoethylene glycol (MEG)：14% (wt), diethylene glycol (DEG)：
0.5% (wt), triethylene glycol (TEG)：0.5% (wt), remaining is the glycol water of water.
In the specific implementation, the operating condition of the hollow fiber film assembly is：Ethylene glycol solution temperature 85 DEG C~100
℃；0.05~0.2m/s of crossflow velocity；- 0.082~-0.092MPa of per-meate side vacuum.
In the specific implementation, described hollow fiber film assembly using inner pressed operate, i.e., be in doughnut fenestra into
Feed liquid, vacuumizes to form negative pressure so that water vapour etc. condenses to form production water through the condensed device of fenestra from the shell side of membrane module；
In the specific implementation, described hollow fiber film assembly is mainly hydrophobic using superpower hydrophobic PTFE doughnuts
Membrane module；
In the specific implementation, the membrane aperture scope of described PTFE hollow fiber hydrophobic membrane components is 0.15~0.2 μm；
In the specific implementation, described ethylene glycol solution circulation is concentrated to quality of glycol concentration 70%~80% (wt)), obtain
To ethylene glycol concentration liquid；
In the specific implementation, described hollow fiber film assembly is two or more sets, changeable operation, between membrane module between
Have a rest on-line operation, every special time, operating membrane module dries dried for standby online；
In the specific implementation, the drying mode of the hollow fiber film assembly is online heated-air drying；
In the specific implementation, the source of the hot blast is air blower air blast of the outlet with heating rod；
In the specific implementation, the embodiment of the online heated-air drying is：Membrane module is out of service → membrane module
Tube side is that membrane module shell side is that per-meate side is taken out very while blasting heated-air drying → continuation in fenestra to blast hot blast out of fenestra
It is empty；
In the specific implementation, it is 30~60 minutes time for vacuumizing of per-meate side that the hollow fiber film assembly shell side, which is,；
In the specific implementation, the hot blast temperature of the online heated-air drying is 50~80 DEG C；
In the specific implementation, the hollow fiber film assembly tube side be blasted in fenestra time of heated-air drying for 60~
300 minutes；
In the specific implementation, the hollow fiber film assembly dried dry time interval for 3~5 days online.
The essential distinction of the present invention and prior art are that the present invention relates to a kind of ethylene oxide hydration preparing ethylene glycol work
The method for concentration of ethylene glycol solution in skill, for problems of the prior art, the present invention is mainly using superpower hydrophobic
Polytetrafluoroethylene (PTFE)（PTFE）Film, also takes inner pressed vacuum membrane distillation mode of operation, for ethylene oxide hydration preparing ethylene glycol work
Ethylene glycol solution in skill carries out concentration.In the present invention, in order to solve higher concentration in membrane module During Process of Long-term Operation
Hydrophiling problem caused by ethylene glycol solution, carries out interval and alternately exists in a specific way during ethylene glycol concentration to membrane module
Line is dried.
The beneficial effects of the invention are as follows：
1st, the reacted ethylene glycol solution of ethylene oxide hydration itself has certain temperature, ethylene oxide hydration reaction outlet
100 DEG C or so of temperature, and membrane distillation system can typically be run at a lower temperature, therefore can be effectively using ethylene glycol solution certainly
Body used heat carries out the membrane distillation concentration dehydration of ethylene glycol solution；
2nd, the present invention using inner pressed vacuum membrane distillation during ethylene glycol solution thickening is carried out, to membrane module
Interval alternately online dry is carried out in a specific way, is reduced hydrophiling of the ethylene glycol solution of higher concentration to hydrophobic membrane and is asked
Topic, effectively maintains the hydrophobicity of hydrophobic membrane module；
3rd, the present invention uses superpower hydrophobic PTFE hollow-fibre membranes, and the hydrophiling for more effectively reducing membrane module is asked
Topic；
4th, using the ethylene glycol solution in the method concentration ethylene oxide hydration preparing ethylene glycol technique of the present invention, will have
Hope and substitute multiple-effect evaporation technology, reduce the energy consumption of multiple-effect evaporation technology, improve treatment effeciency.The inventive method and multiple-effect evaporation phase
Than with equipment investment is few, treatment effeciency is high, operation temperature is low, operating pressure is low, low power consumption and other advantages；
5th, using the method for the invention, the high concentration ethylene glycol solution after membrane distillation concentration is dehydrated can be subjected to essence
Purification processes are evaporated, ethylene glycol is obtained.
Brief description of the drawings
Fig. 1 is the process flow diagram of inner pressed vacuum membrane distillation technique in the present invention
In figure：1-raw water box；2-feed pump；3-hollow fiber film assembly；4-condenser；5-vavuum pump；6-production
Water tank.
Embodiment
Below, with reference to the drawings and specific embodiments, invention is further described.
Embodiment 1
Fig. 1 is shown in technological process signal.
The main water quality characteristic of ethylene glycol solution in ethylene oxide hydration preparing ethylene glycol technique is：Monoethylene glycol (MEG) 14%
(wt), diethylene glycol (DEG) 0.5% (wt), triethylene glycol (TEG) 0.5% (wt), remaining is the glycol water of water.
Membrane module used is polytetrafluoroethylene (PTFE)（PTFE）Hollow fiber hydrophobic membrane component, membrane aperture is 0.2 μm.Doughnut
Hydrophobic membrane module has two groups altogether, and alternately switching is used.Flow is as follows：
First, the glycol water of 90 DEG C of temperature is pumped into raw water box；Secondly, by the glycol water in raw water box
The tube side of hollow fiber film assembly is pumped into specific crossflow velocity by feed pump；Finally, hollow fiber film assembly is oozed
Saturating side is that shell side is vacuumized, under vacuum action, and water vapour in glycol water etc. passes through through fenestra in per-meate side
Condenser condenses to form production water, and the denseer ethylene glycol solution in membrane module tube side then returns to raw water box circulation concentration, thus
Realize concentration and the separation purpose of glycol water.
Concrete operations condition is：Glycol water temperature be 90 DEG C, crossflow velocity 0.15m/s, per-meate side vacuum for-
0.082MPa。
Membrane module dries drying mode online：After one of which hollow fiber film assembly is continuously run 3 days, cut automatically
Change to another set to continue to run with, and be to the membrane module tube side of continuous operation 3 days using air blower of the outlet with heating rod
Heated-air drying is blasted in fenestra, drying time is 60 minutes, and hot blast temperature is 80 DEG C, after drying 60 minutes, is being continued from fenestra
While inside blasting hot blast, it is that per-meate side is vacuumized 30 minutes to membrane module shell side, stops air blast afterwards, membrane module is stand-by.
Under this operating condition, glycol water is concentrated to 80% (wt) from 15% (wt), by detecting the TOC in solution
Ethylene glycol content in cubage solution, and it is converted into mass fraction investigation concentrated effect, flux of membrane distillation when testing initial
For 19L/m2H or so, when the TOC contents in retention side ethylene glycol concentrated solution are concentrated to 224700mg/L, corresponding second two
Alcohol content is 580475mg/L, and the mass fraction for converting into ethylene glycol solution is 52% or so, and now flux of membrane distillation is 10L/m2·
H, when continuing to be concentrated to 80% (wt) by ethylene glycol solution, flux of membrane distillation is reduced to 5L/m2H or so.During this, in production water
TOC≤5mg/L, be converted into ethylene glycol≤15mg/L, be converted into mass fraction≤0.0015% of ethylene glycol solution.
Embodiment 2
Fig. 1 is shown in technological process signal.The main water quality characteristic of ethylene glycol solution in ethylene oxide hydration preparing ethylene glycol technique
Be the same as Example 1.
Membrane module used is polytetrafluoroethylene (PTFE)（PTFE）Hollow fiber hydrophobic membrane component, membrane aperture is 0.2 μm.Doughnut
Hydrophobic membrane module has two groups altogether, and alternately switching is used.Flow is as follows：
First, the glycol water of 85 DEG C or so of temperature is pumped into raw water box；Secondly, by the ethylene glycol water in raw water box
Solution is pumped into the tube side of hollow fiber film assembly by feed pump with specific crossflow velocity；Finally, to hollow fiber film assembly
Per-meate side be that shell side is vacuumized, under vacuum action, water vapour in glycol water etc. through fenestra in per-meate side
Condense to form production water by condenser, the denseer ethylene glycol solution in membrane module tube side then returns to raw water box circulation concentration, this
Sample is achieved that concentration and the separation purpose of glycol water.
Concrete operations condition is：Glycol water temperature be 85 DEG C, crossflow velocity 0.2m/s, per-meate side vacuum for-
0.092MPa。
Membrane module dries drying mode online：After one of which hollow fiber film assembly is continuously run 4 days, cut automatically
Change to another set to continue to run with, and be to the membrane module tube side of continuous operation 4 days using air blower of the outlet with heating rod
Heated-air drying is blasted in fenestra, drying time is 120 minutes, and hot blast temperature is 75 DEG C, after drying 120 minutes, is being continued from film
While blasting hot blast in hole, it is that per-meate side is vacuumized 40 minutes to membrane module shell side, stops air blast afterwards, membrane module is stand-by.
Under this operating condition, glycol water is concentrated to 80% (wt) from 15% (wt), by detecting the TOC in solution
Ethylene glycol content in cubage solution, and it is converted into mass fraction investigation concentrated effect, flux of membrane distillation when testing initial
For 22L/m2H or so, when the TOC contents in retention side ethylene glycol concentrated solution are concentrated to 224700mg/L, corresponding second two
Alcohol content is 580475mg/L, and the mass fraction for converting into ethylene glycol solution is 52% or so, and now flux of membrane distillation is 12L/m2·
H, when continuing to be concentrated to 80% (wt) by ethylene glycol solution, flux of membrane distillation is reduced to 7L/m2H or so.During this, in production water
TOC≤5mg/L, be converted into ethylene glycol≤15mg/L, be converted into mass fraction≤0.0015% of ethylene glycol solution.
Embodiment 3
Fig. 1 is shown in technological process signal.The main water quality characteristic of ethylene glycol solution in ethylene oxide hydration preparing ethylene glycol technique
Be the same as Example 1.
Membrane module used is polytetrafluoroethylene (PTFE)（PTFE）Hollow fiber hydrophobic membrane component, membrane aperture is 0.2 μm.Doughnut
Hydrophobic membrane module has two groups altogether, and alternately switching is used.Flow is as follows：
First, the glycol water of 95 DEG C or so of temperature is pumped into raw water box；Secondly, by the ethylene glycol water in raw water box
Solution is pumped into the tube side of hollow fiber film assembly by feed pump with specific crossflow velocity；Finally, to hollow fiber film assembly
Per-meate side be that shell side is vacuumized, under vacuum action, water vapour in glycol water etc. through fenestra in per-meate side
Condense to form production water by condenser, the denseer ethylene glycol solution in membrane module tube side then returns to raw water box circulation concentration, this
Sample is achieved that concentration and the separation purpose of glycol water.
Concrete operations condition is：Glycol water temperature be 95 DEG C, crossflow velocity 0.1m/s, per-meate side vacuum for-
0.092MPa。
Membrane module dries drying mode online：After one of which hollow fiber film assembly is continuously run 5 days, cut automatically
Change to another set to continue to run with, and be to the membrane module tube side of continuous operation 5 days using air blower of the outlet with heating rod
Heated-air drying is blasted in fenestra, drying time is 300 minutes, and hot blast temperature is 50 DEG C, after drying 300 minutes, is being continued from film
While blasting hot blast in hole, it is that per-meate side is vacuumized 60 minutes to membrane module shell side, stops air blast afterwards, membrane module is stand-by.
Under this operating condition, glycol water is concentrated to 70% (wt) from 15% (wt), by detecting the TOC in solution
Ethylene glycol content in cubage solution, and it is converted into mass fraction investigation concentrated effect, flux of membrane distillation when testing initial
For 25L/m2H or so, when the TOC contents in retention side ethylene glycol concentrated solution are concentrated to 224700mg/L, corresponding second two
Alcohol content is 580475mg/L, and the mass fraction for converting into ethylene glycol solution is 52% or so, and now flux of membrane distillation is 13L/m2·
H, when continuing to be concentrated to 70% (wt) by ethylene glycol solution, flux of membrane distillation is reduced to 9.8L/m2H or so.During this, water is produced
In TOC≤5mg/L, be converted into ethylene glycol≤15mg/L, be converted into mass fraction≤0.0015% of ethylene glycol solution.
Embodiment 4
Fig. 1 is shown in technological process signal.The main water quality characteristic of ethylene glycol solution in ethylene oxide hydration preparing ethylene glycol technique
Be the same as Example 1.
Membrane module used is polytetrafluoroethylene (PTFE)（PTFE）Hollow fiber hydrophobic membrane component, membrane aperture is 0.15 μm.Hollow fibre
Tie up hydrophobic membrane module and have two groups altogether, alternately switching is used.Flow is as follows：
First, the glycol water of 100 DEG C or so of temperature is pumped into raw water box；Secondly, by the ethylene glycol in raw water box
The aqueous solution is pumped into the tube side of hollow fiber film assembly by feed pump with specific crossflow velocity；Finally, to hollow-fibre membrane group
The per-meate side of part is that shell side is vacuumized, under vacuum action, and water vapour in glycol water etc. is through fenestra in infiltration
Side condenses to form production water by condenser, and the denseer ethylene glycol solution in membrane module tube side then returns to raw water box circulation concentration,
So it is achieved that concentration and the separation purpose of glycol water.
Concrete operations condition is：Glycol water temperature be 100 DEG C, crossflow velocity 0.1m/s, per-meate side vacuum for-
0.085MPa。
Membrane module dries drying mode online：After one of which hollow fiber film assembly is continuously run 5 days, cut automatically
Change to another set to continue to run with, and be to the membrane module tube side of continuous operation 5 days using air blower of the outlet with heating rod
Heated-air drying is blasted in fenestra, drying time is 200 minutes, and hot blast temperature is 65 DEG C, after drying 200 minutes, is being continued from film
While blasting hot blast in hole, it is that per-meate side is vacuumized 50 minutes to membrane module shell side, stops air blast afterwards, membrane module is stand-by.
Under this operating condition, glycol water is concentrated to 80% (wt) from 15% (wt), by detecting the TOC in solution
Ethylene glycol content in cubage solution, and it is converted into mass fraction investigation concentrated effect, flux of membrane distillation when testing initial
For 27L/m2H or so, when the TOC contents in retention side ethylene glycol concentrated solution are concentrated to 224700mg/L, corresponding second two
Alcohol content is 580475mg/L, and the mass fraction for converting into ethylene glycol solution is 52% or so, and now flux of membrane distillation is 14L/m2·
H, when continuing to be concentrated to 80% (wt) by ethylene glycol solution, flux of membrane distillation is reduced to 8L/m2H or so.During this, in production water
TOC≤5mg/L, be converted into ethylene glycol≤15mg/L, be converted into mass fraction≤0.0015% of ethylene glycol solution.
Embodiment 5
Fig. 1 is shown in technological process signal.The main water quality characteristic of ethylene glycol solution in ethylene oxide hydration preparing ethylene glycol technique
Be the same as Example 1.
Membrane module used is polytetrafluoroethylene (PTFE)（PTFE）Hollow fiber hydrophobic membrane component, membrane aperture is 0.15 μm.Hollow fibre
Tie up hydrophobic membrane module and have two groups altogether, alternately switching is used.Flow is as follows：
First, the glycol water of 100 DEG C or so of temperature is pumped into raw water box；Secondly, by the ethylene glycol in raw water box
The aqueous solution is pumped into the tube side of hollow fiber film assembly by feed pump with specific crossflow velocity；Finally, to hollow-fibre membrane group
The per-meate side of part is that shell side is vacuumized, under vacuum action, and water vapour in glycol water etc. is through fenestra in infiltration
Side condenses to form production water by condenser, and the denseer ethylene glycol solution in membrane module tube side then returns to raw water box circulation concentration,
So it is achieved that concentration and the separation purpose of glycol water.
Concrete operations condition is：Glycol water temperature is 100 DEG C, crossflow velocity 0.05m/s, per-meate side vacuum
For -0.085MPa.
Membrane module dries drying mode online：After one of which hollow fiber film assembly is continuously run 4 days, cut automatically
Change to another set to continue to run with, and be to the membrane module tube side of continuous operation 4 days using air blower of the outlet with heating rod
Heated-air drying is blasted in fenestra, drying time is 150 minutes, and hot blast temperature is 70 DEG C, after drying 150 minutes, is being continued from film
While blasting hot blast in hole, it is that per-meate side is vacuumized 45 minutes to membrane module shell side, stops air blast afterwards, membrane module is stand-by.
Under this operating condition, glycol water is concentrated to 75% (wt) from 15% (wt), by detecting the TOC in solution
Ethylene glycol content in cubage solution, and it is converted into mass fraction investigation concentrated effect, flux of membrane distillation when testing initial
For 19L/m2H or so, when the TOC contents in retention side ethylene glycol concentrated solution are concentrated to 224700mg/L, corresponding second two
Alcohol content is 580475mg/L, and the mass fraction for converting into ethylene glycol solution is 52% or so, and now flux of membrane distillation is 10L/m2·
H, when continuing to be concentrated to 75% (wt) by ethylene glycol solution, flux of membrane distillation is reduced to 6.8L/m2H or so.During this, water is produced
In TOC≤5mg/L, be converted into ethylene glycol≤15mg/L, be converted into mass fraction≤0.0015% of ethylene glycol solution.
The preferable possible embodiments of the present invention are the foregoing is only, not thereby limit to the scope of the claims of the present invention, thus it is all
It is the equivalence changes made with description of the invention and accompanying drawing content, is both contained in protection scope of the present invention.
Claims (7)
1. the inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution, is mainly comprised the following steps：
(1) first, glycol water is pumped into raw water box；
(2) secondly, the glycol water in raw water box is pumped into the tube side of hollow fiber film assembly；
(3) finally, the per-meate side to hollow fiber film assembly is that shell side is vacuumized, can condensing body per-meate side by condenser it is cold
The solidifying denseer ethylene glycol solution formed in production water, membrane module tube side then returns to raw water box circulation concentration, obtains the dense of ethylene glycol
Contracting liquid；
Glycol water water quality characteristic is：Monoethylene glycol (MEG) 14% (wt), diethylene glycol (DEG) 0.5% (wt), three second
Glycol (TEG) 0.5% (wt), remaining is the glycol water of water；
The ethylene glycol solution circulation is concentrated to quality of glycol concentration 70%~80% (wt), obtains ethylene glycol concentration liquid；
The operating condition of the inner pressed vacuum membrane distillation is：85 DEG C~95 DEG C of ethylene glycol solution temperature；Crossflow velocity 0.05~
0.2m/s；- 0.082~-0.092MPa of per-meate side vacuum；
Described hollow fiber film assembly uses superpower hydrophobic PTFE hollow fiber hydrophobic membranes component；
Described hollow fiber film assembly is two or more sets, switchover operation, interval on-line operation between membrane module, every specific
Time, operating membrane module dries dried for standby online；
The drying mode of the hollow fiber film assembly is online heated-air drying；
The hollow fiber film assembly dried dry time interval for 3~5 days online.
2. the inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution according to claim 1, it is characterised in that described
Hollow fiber film assembly operated using inner pressed, i.e., be feeding liquid in doughnut fenestra.
3. the inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution according to claim 1, it is characterised in that described
PTFE hollow fiber hydrophobic membrane components membrane aperture scope be 0.15~0.2 μm.
4. the inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution according to claim 1, it is characterised in that described
The embodiment of heated-air drying is online：Membrane module is out of service → membrane module tube side be blasted in fenestra heated-air drying →
While continuation blasts hot blast out of fenestra, membrane module shell side is that per-meate side is vacuumized.
5. the inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution according to claim 4, it is characterised in that described
It is 30~60 minutes time for vacuumizing of per-meate side that membrane module shell side, which is,.
6. the inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution according to claim 4, it is characterised in that described
The hot blast temperature of online heated-air drying is 50~80 DEG C.
7. the inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution according to claim 4, it is characterised in that described
Hollow fiber film assembly tube side is that the time of heated-air drying is blasted in fenestra for 60~300 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310364697.6A CN104415664B (en) | 2013-08-20 | 2013-08-20 | The inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310364697.6A CN104415664B (en) | 2013-08-20 | 2013-08-20 | The inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104415664A CN104415664A (en) | 2015-03-18 |
| CN104415664B true CN104415664B (en) | 2017-07-28 |
Family
ID=52966444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310364697.6A Active CN104415664B (en) | 2013-08-20 | 2013-08-20 | The inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104415664B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106076122B (en) * | 2016-08-12 | 2018-08-28 | 北京惠源三达水处理设备有限公司 | A kind of parallel multiple-effect vacuum distillation device and method |
| CN108911978B (en) * | 2018-07-30 | 2020-09-01 | 云南省玉溪市溶剂厂有限公司 | Method for purifying glycerol triacetate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121639A (en) * | 2007-07-13 | 2008-02-13 | 天津大学 | Membrane distillation dehydration method for polyatomic alcohol water solution produced from corn |
| CN101564649A (en) * | 2008-04-23 | 2009-10-28 | 天津工业大学 | Air compressing membrane distillation device and method |
| CN102060344A (en) * | 2010-12-02 | 2011-05-18 | 天津凯铂能膜工程技术有限公司 | Multiple-effect membrane distillation method with high-efficiency inner heat recovering function |
| CN202569965U (en) * | 2012-05-18 | 2012-12-05 | 厦门鲲扬膜科技有限公司 | Dilute sulfuric acid membrane distillation concentrator |
| CN103193286A (en) * | 2012-01-06 | 2013-07-10 | 中国石油化工股份有限公司 | Reverse osmosis concentrated water dissolved gas type vacuum membrane distillation water processing method |
-
2013
- 2013-08-20 CN CN201310364697.6A patent/CN104415664B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121639A (en) * | 2007-07-13 | 2008-02-13 | 天津大学 | Membrane distillation dehydration method for polyatomic alcohol water solution produced from corn |
| CN101564649A (en) * | 2008-04-23 | 2009-10-28 | 天津工业大学 | Air compressing membrane distillation device and method |
| CN102060344A (en) * | 2010-12-02 | 2011-05-18 | 天津凯铂能膜工程技术有限公司 | Multiple-effect membrane distillation method with high-efficiency inner heat recovering function |
| CN103193286A (en) * | 2012-01-06 | 2013-07-10 | 中国石油化工股份有限公司 | Reverse osmosis concentrated water dissolved gas type vacuum membrane distillation water processing method |
| CN202569965U (en) * | 2012-05-18 | 2012-12-05 | 厦门鲲扬膜科技有限公司 | Dilute sulfuric acid membrane distillation concentrator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104415664A (en) | 2015-03-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI630948B (en) | Method for concentrating water-soluble organic matter and device for concentrating water-soluble organic matter | |
| CN109665661B (en) | Method for separating sulfuric acid, acetic acid and furfural from furfural wastewater | |
| CN108328831A (en) | A kind of method for concentration and equipment of reverse osmosis concentrated brine | |
| CN104415664B (en) | The inner pressed vacuum membrane distillation method for concentration of ethylene glycol solution | |
| CN106748648A (en) | A kind of 1,3 propanediol fermentation liquor desalination impurity removed systems and method | |
| CN109111003A (en) | White carbon black washes salt equipment and method | |
| CN106117120B (en) | A kind of technique and device of rectifying-Steam soak coupled method recycling pyridine | |
| JPH07227517A (en) | Separation of liquid mixture | |
| CN104193651A (en) | Refining method and device for synthesizing acetonitrile from acetic acid by ammoniation | |
| CN104926690A (en) | Method and device for recycling and refining acetonitrile in ceftriaxone sodium synthesis | |
| CN104415665B (en) | Internal-pressure-type gas-dissolving vacuum membrane distillation concentration method of ethylene glycol solution | |
| CN104415666B (en) | The immersion vacuum membrane distillation method for concentration of ethylene glycol solution | |
| CN104724776B (en) | Devices and methods therefor in pressure evaporating indirect steam incorporation press water | |
| JP2014046300A (en) | Dehydration method of solution by membrane | |
| CN103007565B (en) | Method and device for triple-effect separation of methylbenzene and polyethylene | |
| CN109078344A (en) | Flash the MVR evaporation concentration equipment and method of defoaming | |
| JPH11267644A (en) | Water treating apparatus | |
| CN106984193A (en) | A kind of Tianna solution dewatering and system | |
| CN206631440U (en) | A kind of Tianna solution dewatering system | |
| CN106882777A (en) | A kind of purifying phosphoric acid concentration technology | |
| CN113800524A (en) | Concentration method of fluosilicic acid | |
| CN104119214B (en) | Seaweed fiber silk produces recovery process and the device of waste acetone dewatering agent | |
| CN206033629U (en) | Rectification device of pyridine is retrieved to vapor permeation coupling method | |
| CN109498658A (en) | A kind of Holothurian machining liquid active principle extracting method | |
| JPS6316001A (en) | Treatment of dehydrating solvent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |