CN104671307B - A kind of DMF wastewater treatment equipment and method - Google Patents
A kind of DMF wastewater treatment equipment and method Download PDFInfo
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- CN104671307B CN104671307B CN201510092727.1A CN201510092727A CN104671307B CN 104671307 B CN104671307 B CN 104671307B CN 201510092727 A CN201510092727 A CN 201510092727A CN 104671307 B CN104671307 B CN 104671307B
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Abstract
The present invention provides a kind of DMF wastewater treatment equipment and method, which includes waste water preheater, vacuum rectification tower, water vapour compressor, rectification under vacuum tower reboiler, vacuum rectification tower reflux pump, intermediate vaporizer, divided-wall distillation column, intermediate steam compressor, intermediate reboiler, intermediate condensation liquid reflux pump, DMF compressor, divided-wall distillation column reboiler and DMF delivery pump.This method the effective energy conservation measure such as carries out rectified purified recycling DMF to chemical leather DMF waste water, while having used heat pump distillation using the distillation system of common vacuum rectification tower and divided-wall distillation column composition, has good energy-saving effect, obtained product quality is high.
Description
Technical field
The invention belongs to field of waste water treatment, and in particular to a kind of DMF wastewater treatment equipment and method.
Background technique
Polyurethane (PU) synthetic leather results from 20th century late nineteen seventies, is developed in the nineties in 20th century, is plastics
One important component of industry, is widely used in national economy every profession and trade, and application field spreads the daily life of people
Every aspect living.The production of synthetic leather generallys use base stock of the polyurethane as base and surface layer, passes through N, N- diformazan
Base amide (DMF) etc. is made as primary solvent with solution polymerization process, and the dosage of solvent accounts about 60% of amount of resin or more,
The dosage of wet process slurry DMF reaches 70% or more.DMF has bio-toxicity, and human body Long Term Contact or sucking can hinder hematopoiesis machine
Liver failure can and be caused, while DMF is difficult to biodegrade, atmosphere and water can be caused seriously to pollute.In the production of synthetic leather
In technique, DMF is mainly used for ingredient dilution, can all generate a large amount of DMF exhaust gas in dry, wet production, absorbs DMF with water and forms
Waste water.In addition, polyurethane solidifies and DMF is leached in water in wet production, a large amount of DMF waste water is generated.In order to eliminate waste water
Influence to environment, also for reducing production cost, it is necessary to which DMF waste water is recycled to be recycled or as pair
Product is sold.The recycling of DMF at present mostly uses greatly rectificating method, and about 80% cost recovery is used for thermal energy consumption, and there are height
The problem of energy consumption.
Domestic use more is double tower DMF recovery technology at present, the use of low-pressure steam or conduction oil is heating agent, dense by normal pressure
Contracting and rectification under vacuum double tower composition, DMF waste water first remove a part of water through atmospheric distillation, then obtain by rectification under vacuum pure
DMF, the technique recovery technology is relatively backward, and energy consumption is high, DMF unstable quality, and the rate of recovery is lower.Since double tower DMF recycles work
Artistic skill consumption is high, and the domestic research and development that three tower DMF recovery technologies are carried out since 2004 and industrialization are tested.The technique is by two
A reduced pressure tower and an atmospheric distillation tower composition.DMF waste water removes a part of water by two-stage decompression concentration respectively, then
Pure DMF is obtained by atmospheric distillation.Since DMF boiling point is higher under condition of normal pressure, low-pressure steam is unable to satisfy heating requirements, therefore
Use conduction oil or middle pressure steam as heating agent.There is document to propose a kind of energy-saving three towers DMF new recovering technology, using level-one
It is concentrated under reduced pressure, three tower recovery process of secondary atmospheric concentration, rectification under vacuum, improves the processing capacity of two tower process, but save
Energy effect is poor, and occupied space is big, and equipment cost is higher.
Summary of the invention
It is an object of the present invention to provide a kind of DMF wastewater treatment equipment and method, the DMF mass that the present invention recycles is steady
Fixed, the rate of recovery is high, while overcoming that above-mentioned technical energy saving effect is poor, and occupied space is big, the higher problem of equipment cost.
A kind of DMF wastewater treatment equipment provided by the invention, including the compression of waste water preheater, vacuum rectification tower, water vapour
Machine, rectification under vacuum tower reboiler, vacuum rectification tower reflux pump, intermediate vaporizer, divided-wall distillation column, intermediate steam compressor,
Intermediate reboiler, intermediate condensation liquid reflux pump, DMF compressor, divided-wall distillation column reboiler and DMF delivery pump.
Waste water preheater connects vacuum rectification tower, and rectification under vacuum column overhead connects water vapour compressor, water vapour compressor
Vacuum rectification tower is connected by rectification under vacuum tower reboiler, vacuum rectification tower middle and lower sections pass through connection rectification under vacuum tower reboiler shape
At circuit, rectification under vacuum tower reboiler connects vacuum rectification tower and distilled water discharge port, decompression by vacuum rectification tower reflux pump
Rectifying tower bottom connects divided-wall distillation column by intermediate vaporizer, and the feed inlet side tower top of divided-wall distillation column passes through centre
Vapour compression machine connects intermediate reboiler, and divided-wall distillation column middle and lower part feed inlet side is formed back by connecting intermediate reboiler
Road, intermediate reboiler connect divided-wall distillation column feed inlet side and the charging of waste water preheater by intermediate condensation liquid reflux pump
Mouthful, side tower top of the divided-wall distillation column far from feed inlet connects divided-wall distillation column reboiler, partition wall by DMF compressor
Side of the rectifying column middle and lower part far from feed inlet is by connection divided-wall distillation column reboiler forming circuit, and divided-wall distillation column is again
It boils device and side and DMF outlet for product of the divided-wall distillation column far from feed inlet, divided-wall distillation column is connected by DMF delivery pump
Tower bottom connects heavy constituent impurity discharge port.
The present invention also provides a kind of DMF wastewater treatment equipments, including waste water preheater, vacuum rectification tower, water vapor pressure
Contracting machine, vacuum rectification tower reflux pump, intermediate vaporizer, removes water tower, DMF rectifying column, intermediate steam pressure at rectification under vacuum tower reboiler
Contracting machine, removes water tower condensate reflux pump, DMF compressor, DMF rectifying tower reboiler and DMF delivery pump at water removal tower reboiler；
Waste water preheater connects vacuum rectification tower, and rectification under vacuum column overhead connects water vapour compressor, water vapour compressor
Vacuum rectification tower is connected by rectification under vacuum tower reboiler, vacuum rectification tower middle and lower sections pass through connection rectification under vacuum tower reboiler shape
At circuit, rectification under vacuum tower reboiler connects vacuum rectification tower and distilled water discharge port, decompression by vacuum rectification tower reflux pump
Water tower is removed by the connection of intermediate vaporizer in rectifying tower bottom, and water removal column overhead is by the connection of intermediate steam compressor except water tower boils again
Device, except water tower middle and lower part is by connection water removal tower reboiler forming circuit, water removal tower reboiler except water tower condensate liquid by flowing back
Pump connection removes water tower and waste water preheater feed inlet, and except water tower tower bottom connects DMF rectifying column feed inlet, the top of the distillation column DMF is logical
DMF compressor connection DMF rectifying tower reboiler is crossed, DMF rectifying column middle and lower part is formed back by connecting DMF rectifying tower reboiler
Road, DMF rectifying tower reboiler connect DMF rectifying column and DMF outlet for product, the connection of DMF rectifying tower bottom by DMF delivery pump
Heavy constituent impurity discharge port.
The present invention also provides a kind of DMF wastewater treatment methods, include the following steps:
Decompression essence is passed through after the preheating of waste water preheater together using DMF waste water to be treated as raw material and recycle stock
Tower is evaporated, obtains water vapour in rectification under vacuum tower top after rectifying separation, water vapour improves vapor (steam) temperature through water vapour compressor compresses
It is afterwards the heat supply of rectification under vacuum tower reboiler, obtained condensate liquid is back to rectification under vacuum by vacuum rectification tower reflux pump a part
Tower, a part are directly produced by distilled water discharge port；
Vacuum rectification tower tower bottom be concentrated after DMF waste water, through intermediate vaporizer heating vaporization after be passed through one share
In the divided-wall distillation column of stripping section, rectification process is carried out；
The side tower top ipsilateral with feed inlet obtains the water vapour containing a small amount of DMF in divided-wall distillation column, steams through centre
Vapour compressor compresses are intermediate reboiler heat supply after improving vapor (steam) temperature, and obtained condensate liquid passes through intermediate condensation liquid reflux pump,
A part is back to divided-wall distillation column, and a part is used as recycle stock, preheats again through waste water after mixing with DMF waste water raw material
Device enters vacuum rectification tower；
In the DMF steam that the other side tower top of divided-wall distillation column is refined, steam temperature is improved through DMF compressor compresses
It is the heat supply of divided-wall distillation column reboiler after degree, obtained condensate liquid is back to partition wall rectifying by DMF delivery pump, a part
Tower, a part are produced as DMF product through DMF outlet for product；
The heavy constituent impurity that divided-wall distillation column tower bottom obtains is produced through heavy constituent impurity discharge port.
The present invention also provides a kind of DMF wastewater treatment methods, include the following steps:
Decompression essence is passed through after the preheating of waste water preheater together using DMF waste water to be treated as raw material and recycle stock
Tower is evaporated, obtains water vapour in rectification under vacuum column overhead after rectifying separation, water vapour improves steam temperature through water vapour compressor compresses
It is the heat supply of rectification under vacuum tower reboiler after degree, obtained condensate liquid is back to decompression essence by vacuum rectification tower reflux pump a part
Tower is evaporated, a part is directly produced by distilled water discharge port；
Vacuum rectification tower tower bottom be concentrated after DMF waste water, be passed through after the heating vaporization of intermediate vaporizer except water tower, into
Row rectification process；
The water vapour containing a small amount of DMF is obtained in water removal column overhead, after intermediate steam compressor compresses improve vapor (steam) temperature,
To remove water tower reboiler heat supply, obtained condensate liquid is back to by removing water tower condensate reflux pump, a part except water tower, and one
It is allocated as entering vacuum rectification tower through waste water preheater again after mixing with DMF waste water raw material for recycle stock；
Except the material that water tower tower bottom obtains enters DMF rectifying column, in the DMF steam that the top of the distillation column DMF is refined, warp
It is DMF rectifying tower reboiler heat supply after DMF compressor compresses improve vapor (steam) temperature, obtained condensate liquid passes through DMF delivery pump,
A part is back to DMF rectifying column, and a part is produced as DMF product through DMF outlet for product；
The heavy constituent impurity that DMF rectifying tower bottom obtains is produced through heavy constituent impurity discharge port.
Further, the operation temperature of vacuum rectification tower is 70-110 DEG C, operating pressure 0.05-0.1MPa, and tower top returns
Stream is than being 0.8~7.
Further, the operation temperature of divided-wall distillation column is 80-120 DEG C, operating pressure 0.01-0.1MPa, charging
The overhead reflux ratio of mouth side is 0.5~3, and the overhead reflux ratio far from feed inlet side is 0.2~2.
Further, except the operation temperature of water tower is 80-120 DEG C, the operation temperature of DMF rectifying column is 90-130 DEG C, is removed
The operating pressure of water tower and DMF rectifying column is 0.01-0.1MPa, and water removal column overhead reflux ratio is the top of the distillation column 0.5~4, DMF
Reflux ratio is 0.5~3.
The beneficial effects of the present invention are:
(1) heat pump distillation is used, converts high-grade thermal energy for the low grade heat energy of the top of the distillation column, is supplied for reboiler
Heat rationally greatly reduces process energy consumption instead of the use of low pressure or middle pressure steam using heat, has reached energy-saving
Purpose can save energy 50% or more compared with traditional three tower process, while also reducing overhead condenser, both reduce cooling
The use of water reduces equipment investment again；
(2) two tower process integration of vacuum rectification tower and divided-wall distillation column is used, compared with traditional three tower process, operation
Capacity is big, and energy-saving effect is significant, and reduces by a tower and saved equipment investment to reduce occupied area；
(3) all very high by the water and DMF product purity that are refining to obtain, high-quality, DMF product can be recycled, can also
It is sold directly as product, water can be used as process soft water use, reduce the discharge of waste water.
Detailed description of the invention
Fig. 1 show DMF wastewater treatment equipment structural schematic diagram in the embodiment of the present invention 1.
Fig. 2 show DMF wastewater treatment equipment structural schematic diagram in the embodiment of the present invention 2.
Specific embodiment
Below in conjunction with specific embodiment the present invention is described in detail.It should be noted that skill described in following embodiments
The combination of art feature or technical characteristic is not construed as isolated, they can be combined with each other to reaching better
Technical effect.
Embodiment 1
Divided-wall distillation column (Dividing Wall Column, abbreviation DWC) is that a vertical wall is arranged in rectifying column,
Vertical wall can be extended to tower top or tower bottom, DWC tower can be had common rectifying section or stripping by the separated two parts of partition wall
Section, or have common rectifying section and stripping section simultaneously.DWC tower is thermodynamically comparatively ideal system structure, mixed separating 3 components
When closing object, with identical number of theoretical plate, same separation task is completed, it need to be less than traditional two-tower process using DWC tower
Boiling hot amount and condensation number again.For certain given materials, divided-wall distillation column is compared with conventional rectification tower needs smaller reflux
Than, therefore operation capacity increases, energy conservation can reach 60% or more, may save equipment investment 30%.DWC tower can be answered widely
It is separated for petroleum refining, petrochemical industry, chemicals and gas.
The present invention provides a kind of DMF wastewater treatment method, this method uses common vacuum rectification tower and partition wall rectifying
The distillation system of tower composition the effective energy conservation such as carries out rectified purified recycling DMF to DMF waste water, while having used heat pump distillation and arranges
It applies, there is good energy-saving effect, obtained product quality is high.
Fig. 1 show DMF wastewater treatment equipment structural schematic diagram in the embodiment of the present invention 1.
As shown in Figure 1, a kind of DMF wastewater treatment equipment provided by the invention, including waste water preheater 1, vacuum rectification tower
2, water vapour compressor 3, rectification under vacuum tower reboiler 4, vacuum rectification tower reflux pump 5, intermediate vaporizer 6, divided-wall distillation column
7, intermediate steam compressor 8, intermediate reboiler 9, intermediate condensation liquid reflux pump 10, DMF compressor 11, divided-wall distillation column boil again
Device 12 and DMF delivery pump 13；
Waste water preheater 1 connects vacuum rectification tower 2, and 2 tower top of vacuum rectification tower connects water vapour compressor 3, water vapor pressure
Contracting machine 3 connects vacuum rectification tower 2 by rectification under vacuum tower reboiler 4, and 2 middle and lower sections of vacuum rectification tower pass through connection vacuum rectification tower
Reboiler 4 is formed into a loop, and rectification under vacuum tower reboiler 4 connects vacuum rectification tower 2 and distilled water by vacuum rectification tower reflux pump 5
Discharge port 14,2 tower bottom of vacuum rectification tower connect divided-wall distillation column 7, the charging of divided-wall distillation column 7 by intermediate vaporizer 6
Mouth side tower top connects intermediate reboiler 9 by intermediate steam compressor 8, and 7 middle and lower part feed inlet side of divided-wall distillation column is logical
The forming circuit of connection intermediate reboiler 9 is crossed, intermediate reboiler 9 connects divided-wall distillation column 7 by intermediate condensation liquid reflux pump 10
1 feed inlet of feed inlet side and waste water preheater, divided-wall distillation column 7 pass through DMF compressor far from the side tower top of feed inlet
11 connection divided-wall distillation column reboilers 12, side of 7 middle and lower part of divided-wall distillation column far from feed inlet pass through connection partition wall
Rectifying tower reboiler 12 is formed into a loop, and divided-wall distillation column reboiler 12 connects divided-wall distillation column 7 far by DMF delivery pump 13
Side and DMF outlet for product 15 from feed inlet, 7 tower bottom of divided-wall distillation column connect heavy constituent impurity discharge port 16.
Rectification under vacuum tower reboiler 4, intermediate reboiler 9 and divided-wall distillation column reboiler 12 in the device be make it is smart
The equipment of the liquid vaporization evaporated, is generally used in combination forming circuit with rectifying column.The liquid phase stream flowed out from rectifying tower bottom enters
Into reboiler, usually there is the liquid of 25-30% to be vaporized in reboiler.The gaseous component being vaporized is sent back to rectifying column
In, and tower tray is flowed upwards through, and liquid phase component returns to tower bottom.Vacuum rectification tower 2 and divided-wall distillation column 7 pass through correspondence
Reboiler forming circuit, to carry out vapour-liquid mass to provide upflowing vapor inside rectifying column with the liquid phase stream in tower, guarantee
The progress of distillation process.
A kind of DMF wastewater treatment method provided by the invention, includes the following steps:
Decompression is passed through after the preheating of waste water preheater 1 together using DMF waste water to be treated as raw material and recycle stock
Rectifying column 2 obtains water vapour in 2 tower top of vacuum rectification tower after rectifying separation, and water vapour is compressed to improve through water vapour compressor 3 and be steamed
It is 4 heat supply of rectification under vacuum tower reboiler after stripping temperature, obtained condensate liquid passes through vacuum rectification tower reflux pump 5, a part reflux
To vacuum rectification tower 2, a part is directly produced by distilled water discharge port 14；
DMF waste water after 2 tower bottom of vacuum rectification tower is concentrated, from feed inlet after the heating vaporization of intermediate vaporizer 6
It is passed through in the divided-wall distillation column 7 of a shared stripping section, carries out rectification process；
The side tower top ipsilateral with feed inlet obtains the water vapour containing a small amount of DMF in divided-wall distillation column 7, steams through centre
The compression of vapour compressor 8 is 9 heat supply of intermediate reboiler after improving vapor (steam) temperature, and obtained condensate liquid passes through intermediate condensation liquid reflux pump
10, a part is back to divided-wall distillation column 7, and a part is used as recycle stock, again through waste water after mixing with DMF waste water raw material
Preheater 1 enters vacuum rectification tower 2；
In the DMF steam that the other side tower top of divided-wall distillation column 7 is refined, compresses to improve through DMF compressor 11 and steam
It is 12 heat supply of divided-wall distillation column reboiler after stripping temperature, by DMF delivery pump 13, a part is back to point obtained condensate liquid
Next door rectifying column 7, a part are produced as DMF product through DMF outlet for product 15；
The heavy constituent impurity that 7 tower bottom of divided-wall distillation column obtains is produced through heavy constituent impurity discharge port 16.
Main component is DMF and water in DMF waste water, and wherein the weight percent content of DMF is 10~80%, in addition to this
Also contain one of components such as a small amount of saline and alkaline, ketone, esters or other organic matters or a variety of, and these impurity are that heavy constituent is miscellaneous
Matter.
2 operation temperature of vacuum rectification tower be 70-110 DEG C, operating pressure 0.05-0.1MPa, overhead reflux ratio be 0.8~
7。
7 operation temperature of divided-wall distillation column is 80-120 DEG C, operating pressure 0.01-0.1MPa, the tower of feed inlet side
Pushing up reflux ratio is 0.5~3, and the overhead reflux ratio far from feed inlet side is 0.2~2.
Embodiment 2
Fig. 2 show DMF wastewater treatment equipment structural schematic diagram in the embodiment of the present invention 2.
As shown in Fig. 2, a kind of DMF wastewater treatment equipment provided by the invention, including waste water preheater 1, vacuum rectification tower
2, water vapour compressor 3, rectification under vacuum tower reboiler 4, vacuum rectification tower reflux pump 5, intermediate vaporizer 6, remove water tower 17, DMF
Rectifying column 20, water removal tower reboiler 18, removes water tower condensate reflux pump 19, DMF compressor 11, DMF at intermediate steam compressor 8
Rectifying tower reboiler 21 and DMF delivery pump 13；
Waste water preheater 1 connects vacuum rectification tower 2, and 2 tower top of vacuum rectification tower connects water vapour compressor 3, water vapor pressure
Contracting machine 3 connects vacuum rectification tower 2 by rectification under vacuum tower reboiler 4, and 2 middle and lower sections of vacuum rectification tower pass through connection vacuum rectification tower
Reboiler 4 is formed into a loop, and rectification under vacuum tower reboiler 4 connects vacuum rectification tower 2 and distilled water by vacuum rectification tower reflux pump 5
Discharge port 14,2 tower bottom of vacuum rectification tower is by intermediate vaporizer 6 connection 17 towers of water removal, except 17 tower top of water tower passes through intermediate steam
The connection water removal tower reboiler 18 of compressor 8 removes water tower except 17 middle and lower part of water tower is formed into a loop by connection water removal tower reboiler 18
Reboiler 18 removes 17 tower bottom of water tower by removing 1 feed inlet of water tower 17 and waste water preheater except the connection of water tower condensate reflux pump 19
20 feed inlet of DMF rectifying column is connected, 20 tower top of DMF rectifying column connects DMF rectifying tower reboiler 21, DMF by DMF compressor 11
20 middle and lower part of rectifying column is formed into a loop by connection DMF rectifying tower reboiler 21, and DMF rectifying tower reboiler 21 is conveyed by DMF
13 connection DMF rectifying column 20 of pump and DMF outlet for product 15,20 tower bottom of DMF rectifying column connect heavy constituent impurity discharge port 16.
The middle rectification under vacuum tower reboiler 4 of the device, water removal tower reboiler 18 and DMF rectifying tower reboiler 21 be make it is smart
The equipment of the liquid vaporization evaporated, is generally used in combination forming circuit with rectifying column.The liquid phase stream flowed out from rectifying tower bottom enters
Into reboiler, usually there is the liquid of 25-30% to be vaporized in reboiler.The gaseous component being vaporized is sent back to rectifying column
In, and tower tray is flowed upwards through, and liquid phase component returns to tower bottom.Vacuum rectification tower 2 removes water tower 17 and DMF rectifying column 20
It is formed into a loop by corresponding reboiler, to carry out vapour-liquid with the liquid phase stream in tower to provide upflowing vapor inside rectifying column
Mass transfer guarantees the progress of distillation process.
A kind of DMF wastewater treatment method, includes the following steps:
Decompression is passed through after the preheating of waste water preheater 1 together using DMF waste water to be treated as raw material and recycle stock
Rectifying column 2 obtains water vapour in 2 tower top of vacuum rectification tower after rectifying separation, and water vapour is compressed to improve through water vapour compressor 3 and be steamed
It is 4 heat supply of rectification under vacuum tower reboiler after stripping temperature, obtained condensate liquid is back to by 5 a part of vacuum rectification tower reflux pump
Vacuum rectification tower 2, a part are directly produced by distilled water discharge port 14；
2 tower bottom of vacuum rectification tower be concentrated after DMF waste water, through intermediate vaporizer 6 heating vaporization after be passed through except water tower
17 carry out rectification process；
The water vapour containing a small amount of DMF is being obtained except 17 tower top of water tower, is being compressed through intermediate steam compressor 8 and improves vapor (steam) temperature
Afterwards for water removal 18 heat supply of tower reboiler, obtained condensate liquid is back to water removal by removing water tower condensate reflux pump 19, a part
Tower 17, a part enter vacuum rectification tower 2 through waste water preheater 1 again after mixing as recycle stock with DMF waste water raw material；
Except the material that 17 tower bottom of water tower obtains enters DMF rectifying column 20, in the DMF that 20 tower top of DMF rectifying column is refined
Steam is 21 heat supply of DMF rectifying tower reboiler after DMF compressor 11 compresses and improves vapor (steam) temperature, and obtained condensate liquid passes through
DMF delivery pump 13, a part are back to DMF rectifying column 20, and a part is produced as DMF product through DMF outlet for product 15；
The heavy constituent impurity that 20 tower bottom of DMF rectifying column obtains is produced through heavy constituent impurity discharge port 16.
Main component is DMF and water in DMF waste water, and wherein the weight percent content of DMF is 10~80%, in addition to this
Also contain one of components such as a small amount of saline and alkaline, ketone, esters or other organic matters or a variety of, and these impurity are that heavy constituent is miscellaneous
Matter；
2 operation temperature of vacuum rectification tower be 70-110 DEG C, operating pressure 0.05-0.1MPa, overhead reflux ratio be 0.8~
7。
Except the operation temperature of water tower 17 is 80-120 DEG C, the operation temperature of DMF rectifying column 20 is 90-130 DEG C, removes water tower 17
Operating pressure with DMF rectifying column 20 is 0.01-0.1MPa, except 17 overhead reflux ratio of water tower is 0.5~4, DMF rectifying column, 20 tower
Pushing up reflux ratio is 0.5~3.
The present invention use tower top direct-type heat pump distillation: the top of the distillation column discharging steam enter vacuum pump be increased to it is higher
After pressure and temperature, into corresponding reboiler, it is reboiler heat supply that heat is released in steam condensation, and condensate liquid a part flows back,
A part is as discharging extraction.
The application of heat pump distillation technology, is rationally utilized heat, so that low-grade thermal energy is converted into high-grade thermal energy,
Instead of the use of raw steam, the consumption of raw steam is substantially reduced, while decreasing the dosage of recirculated cooling water, reached section
The purpose that can be lowered consumption；Furthermore overhead condenser is also reduced, equipment investment is reduced, also reduces occupied area.
Although having been presented for some embodiments of the present invention herein, it will be appreciated by those of skill in the art that
Without departing from the spirit of the invention, the embodiments herein can be changed.Above-described embodiment is only exemplary, no
It should be using the embodiments herein as the restriction of interest field of the present invention.
Claims (4)
1. a kind of DMF wastewater treatment equipment, which is characterized in that including waste water preheater, vacuum rectification tower, water vapour compressor,
Rectification under vacuum tower reboiler, vacuum rectification tower reflux pump, intermediate vaporizer, divided-wall distillation column, intermediate steam compressor, centre
Reboiler, intermediate condensation liquid reflux pump, DMF compressor, divided-wall distillation column reboiler and DMF delivery pump；
The waste water preheater connects the vacuum rectification tower, and the rectification under vacuum column overhead connects the water vapour compressor,
The water vapour compressor connects the vacuum rectification tower by the rectification under vacuum tower reboiler, in the vacuum rectification tower under
Section passes through the vacuum rectification tower by connecting the rectification under vacuum tower reboiler forming circuit, the rectification under vacuum tower reboiler
Reflux pump connects the vacuum rectification tower and distilled water discharge port, and the vacuum rectification tower tower bottom is connected by the intermediate vaporizer
The divided-wall distillation column is connect, the feed inlet side tower top of the divided-wall distillation column is connected by the intermediate steam compressor
The intermediate reboiler, the divided-wall distillation column middle and lower part feed inlet side are formed back by connecting the intermediate reboiler
Road, the intermediate reboiler connect divided-wall distillation column feed inlet side and waste water by the intermediate condensation liquid reflux pump
Preheater feed inlet, side tower top of the divided-wall distillation column far from feed inlet pass through described point of DMF compressor connection
Next door rectifying tower reboiler, side of the divided-wall distillation column middle and lower part far from feed inlet is by connecting the partition wall rectifying
Tower reboiler forming circuit, the divided-wall distillation column reboiler connect the divided-wall distillation column by the DMF delivery pump
Side and DMF outlet for product far from feed inlet, the divided-wall distillation column tower bottom connect heavy constituent impurity discharge port.
2. a kind of DMF wastewater treatment method, which comprises the steps of:
Described subtract is passed through after waste water preheater preheating together using DMF waste water to be treated as raw material and recycle stock
Rectifying column is pressed, obtains water vapour in the rectification under vacuum tower top after rectifying separation, water vapour is through the water vapour compressor compresses
It is the rectification under vacuum tower reboiler heat supply after raising vapor (steam) temperature, obtained condensate liquid passes through the vacuum rectification tower reflux pump
A part is back to the vacuum rectification tower, and a part is directly produced by the distilled water discharge port；
The vacuum rectification tower tower bottom be concentrated after DMF waste water, from feed inlet after the intermediate vaporizer heating vaporization
It is passed through in the divided-wall distillation column of a shared stripping section, carries out rectification process；
The side tower top ipsilateral with feed inlet obtains the water vapour containing a small amount of DMF in the divided-wall distillation column, in described
Between vapour compression machine compression improve vapor (steam) temperature after be the intermediate reboiler heat supply, obtained condensate liquid is cold by the centre
Lime set reflux pump, a part are back to the divided-wall distillation column, and a part is used as recycle stock, mixes with DMF waste water raw material
Enter vacuum rectification tower through the waste water preheater again afterwards；
In the DMF steam that the other side tower top of the divided-wall distillation column is refined, improves and steam through the DMF compressor compresses
It is the divided-wall distillation column reboiler heat supply after stripping temperature, obtained condensate liquid passes through the DMF delivery pump, a part reflux
To point next door rectifying column, a part is produced as DMF product through the DMF outlet for product；
The heavy constituent impurity that the divided-wall distillation column tower bottom obtains is produced through the heavy constituent impurity discharge port.
3. a kind of DMF wastewater treatment method as claimed in claim 2, which is characterized in that the vacuum rectification tower operates temperature
Degree is 70-110 DEG C, operating pressure 0.05-0.1MPa, and overhead reflux ratio is 0.8 ~ 7.
4. a kind of DMF wastewater treatment method as claimed in claim 2, which is characterized in that the divided-wall distillation column operation
Temperature is 80-120 DEG C, operating pressure 0.01-0.1MPa, and the overhead reflux ratio of feed inlet side is 0.5 ~ 3, far from feed inlet
The overhead reflux ratio of side is 0.2 ~ 2.
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| CN201510092727.1A CN104671307B (en) | 2015-03-03 | 2015-03-03 | A kind of DMF wastewater treatment equipment and method |
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| CN201510092727.1A CN104671307B (en) | 2015-03-03 | 2015-03-03 | A kind of DMF wastewater treatment equipment and method |
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| CN104671307A CN104671307A (en) | 2015-06-03 |
| CN104671307B true CN104671307B (en) | 2019-05-10 |
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| CN104926676B (en) * | 2015-07-07 | 2017-01-04 | 天津大学 | A kind of solvent recovering system of low concentration DMF brine waste |
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| CN109369444B (en) * | 2018-12-07 | 2023-12-12 | 天津乐科节能科技有限公司 | Dimethylformamide self-regenerative rectification system and recovery method |
| CN112142140A (en) * | 2019-06-28 | 2020-12-29 | 中国石油化工股份有限公司 | Waste water recovery device and method in nanofiltration membrane production |
| CN112142618B (en) * | 2019-06-28 | 2023-07-21 | 中国石油化工股份有限公司 | Low-concentration dimethylformamide wastewater recovery system and method |
| CN110652741A (en) * | 2019-10-08 | 2020-01-07 | 广州首联环境工程有限公司 | Heat pump rectification system and process method for preparing electronic-grade ethyl lactate by using same |
| CN110615494B (en) * | 2019-10-31 | 2023-11-10 | 格琳嘉(杭州)科技发展有限公司 | Post-treatment device and method for complex DMF wastewater after DMF recovery |
| CN110937744B (en) * | 2019-12-09 | 2021-01-15 | 西安交通大学 | Dimethylamine treatment process in synthetic leather DMF (dimethyl formamide) wastewater heat pump rectification process |
| CN110743189B (en) * | 2019-12-11 | 2021-07-27 | 贺源 | Energy-saving carbon disulfide rectification process |
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