CN207002611U - The DMF wastewater treatment energy savers that a kind of low pressure heat pump distillation is combined with double-effect rectification - Google Patents
The DMF wastewater treatment energy savers that a kind of low pressure heat pump distillation is combined with double-effect rectification Download PDFInfo
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- CN207002611U CN207002611U CN201720711857.3U CN201720711857U CN207002611U CN 207002611 U CN207002611 U CN 207002611U CN 201720711857 U CN201720711857 U CN 201720711857U CN 207002611 U CN207002611 U CN 207002611U
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Abstract
The utility model belongs to chemical field, more particularly to the DMF wastewater treatment energy savers that a kind of high DMF of energy-saving and emission-reduction, output purity low pressure heat pump distillation is combined with double-effect rectification, specifically, the DMF wastewater treatment energy savers that a kind of low pressure heat pump distillation is combined with double-effect rectification, including first order rectifying column, second level rectifying column, the third level rectifying column being sequentially connected；Wherein, first order rectifying column is Heat pump assisted column；The thermal source of second level rectifying column is provided by the overhead vapours of third level rectifying column；It is provided between second level rectifying column, third level rectifying column and is used to make the evaporator that the bottomsstream of second level rectifying column gasifies.It the advantage is that, energy-saving and emission-reduction, being capable of the high DMF of output purity.
Description
Technical field
It the utility model is related to chemical field, more particularly to a kind of high DMF of energy-saving and emission-reduction, output purity low pressure heat pump
The DMF wastewater treatment energy savers that rectifying is combined with double-effect rectification.
Background technology
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, its application field is daily throughout people in national economy industry-by-industry
The every aspect of life.The N,N-dimethylformamide (abbreviation DMF) largely used in PU synthetic leather production processes is a kind of
Polar solvent, there is the laudatory title of " alembroth ".DMF is widely used in PU synthetic leather surface in PU synthetic leather industry as solvent
Processing procedure and double-layer fur wet processing process.Due to DMF only as carrier solvent without chemically reacting, in amount almost
It is not lost, but fully enters in production waste water.Often it is only about 100,000,000 tons of the waste water containing DMF of synthetic leather industry discharge.
DMF has bio-toxicity, and human body Long Term Contact or suction can hinder hematopoietic function, and cause liver failure, can also
Air and water are caused seriously to pollute.DMF values are higher, in order to eliminate influence of the DMF waste water to environment, also for reduction enterprise
Production cost, it is necessary to which DMF waste water is reclaimed and recycled.
PU synthetic leather enterprise is reclaimed into largely using the DMF in the PROCESS FOR TREATMENT recovery DMF waste water of multi-effect distillation at present
This 80% or so is used for thermal energy consumption, the problem of recovery high energy consumption be present.Meanwhile the technique is made due to operation temperature height
Decomposed into DMF serious, produce a large amount of more intractable dimethylamine waste waters, and with equipment scaling, block the problem of serious.Cause
This, will make PU synthetic leather industry sustainable developments, it is necessary to accomplish PU synthetic leather clean manufacturings, solve the problems, such as environmental protection and highly energy-consuming.
Chinese patent CN201510092727.1 discloses a kind of DMF wastewater treatment equipments and method, proposes using decompression
The technique of rectifying column and divided-wall distillation column or three-tower rectification, the technique use two vapour compression machines, a DMF compressor,
Recycling for indirect steam is realized, there is certain energy-saving effect.Its weak point is carried out using two vapour compression machines
Pre-concentration, energy-saving effect is very limited, and the temperature and pressure of DMF steam is improved using DMF compressors, is supplied for DMF rectifying columns
Heat, DMF temperature are improved, and decomposing can be very serious, and then produces more intractable dimethylamine waste water；The technology theory
It is feasible, but lack operability.
Chinese patent CN201410364484.8 discloses the work of the double-effect rectification method processing low concentration DMF waste water with heat pump
Skill, propose to provide thermal source using vacuum rectification tower overhead vapours for flash column kettle material, vacuum rectification tower kettle material is passed through
DMF compressors provide low-temperature receiver for flash column overhead condensation.Technology theory analysis is wrong, and the Stress control of vacuum rectification tower is far high
In flash distillation pressure tower, and vacuum rectification tower kettle material improves calorific value after DMF compressor compresses, is also flash distillation column overhead
Condensation provides low-temperature receiver, theoretical wrong with logic, without exploitativeness.
Chinese science and technology paper ---《Dilute DMAC aqueous solution is reclaimed in the processing of MVR heat pump distillations》It is proposed three kinds of MVR heat pump distillations
Technique, one of which technique are the conventional two tower rectification process of MVR-, and the tower top indirect steam of DMAC pre-concentration towers uses MVR heat pumps
It is pre-concentration tower tower reactor heat supply after compression, DMAC rectifying columns are by external steam heat supply.The process operability is strong, energy-saving effect compared with
Good, being disadvantageous in that the indirect steam of DMAC rectifying columns still can not utilize, and consume larger amount of cooling water；Do not pre-process,
Can not solve the problems, such as rectifying column fouling and clogging；And gas-phase feed technique is not used, DMAC product purity can not be ensured.
Utility model content
The high DMF of a kind of energy-saving and emission-reduction of the utility model offer, output purity low pressure heat pump distillation and double-effect rectification knot
The DMF wastewater treatment energy savers of conjunction.
To achieve the above object, the utility model provides following technical scheme：A kind of low pressure heat pump distillation and double-effect rectification
With reference to DMF wastewater treatment energy savers, including be sequentially connected first order rectifying column, second level rectifying column, third level rectifying
Tower；Wherein, first order rectifying column is Heat pump assisted column；Second level rectifying column thermal source is carried by the overhead vapours of third level rectifying column
For；It is provided between second level rectifying column, third level rectifying column and is used to make the evaporator that the bottomsstream of second level rectifying column gasifies.
In the DMF wastewater treatment energy savers that above-mentioned low pressure heat pump distillation is combined with double-effect rectification, described heat pump
Rectifying column includes the first tower body, the first tower reactor and is connected to tower top outlet for the heat pump to the first tower reactor heat supply, described heat pump.
In the DMF wastewater treatment energy savers that above-mentioned low pressure heat pump distillation is combined with double-effect rectification, described second
Level rectifying column includes the second tower body and the second tower reactor；Described third level rectifying column includes the 3rd tower body and the 3rd tower reactor；Second
The bottom of the gas-liquid separator connected with evaporator, described evaporator and the second tower body is provided between tower body and the 3rd tower body
Connection, described gas-liquid separator connect with the charging aperture of the 3rd tower body.
In the DMF wastewater treatment energy savers that above-mentioned low pressure heat pump distillation is combined with double-effect rectification, described second
The top of tower body is provided with the condenser for condensing overhead vapor.
In the DMF wastewater treatment energy savers that above-mentioned low pressure heat pump distillation is combined with double-effect rectification, described first
The entrance of level rectifying column is connected with filter.
Compared with prior art, the beneficial effects of the utility model are：Technique and system of the present utility model are relatively low
Operated under negative pressure state, can effectively reduce DMF decomposition amount, save about 75 tons of DMF decomposition amounts in year, and avoided producing and be largely more difficult to
The dimethylamine waste water of processing, solves the difficult problem of environmental protection of DMF wastewater treatments；System carries pretreatment unit, can effectively solve equipment
Fouling, block the problem of serious；And according to the characteristic of DMF waste water systems, in the different stages using heat pump distillation and economic benefits and social benefits essence
The processing mode being combined is evaporated, gives full play to the advantage of two kinds of different process sections, energy-saving effect is notable, at traditional three-effect rectification
Reason DMF waster water processes compare, and save energy consumption 38%, have significant economic and practical and economic benefit.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment 1 of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Embodiment
In order to more clearly illustrate scheme of the present utility model, the present embodiment illustrates device of the present utility model first
Concrete structure and its pipeline connecting mode；Then its technological principle is illustrated again.
DMF wastewater treatments energy saver such as Fig. 1 that low pressure heat pump distillation of the present utility model is combined with double-effect rectification, specifically
Including：First order rectifying column, second level rectifying column, the third level rectifying column being sequentially connected；The entrance connection of first order rectifying column
There is filter；Wherein, first order rectifying column is the rectifying column of heat pump 3；Second level rectifying column thermal source by third level rectifying column tower top
Steam provides；It is provided between second level rectifying column, third level rectifying column and is used to make the bottomsstream of second level rectifying column gasify
Evaporator 8.
In actual applications, in order to reach energy-saving and emission-reduction and improve the effect of DMF purity, by three-level rectification process, this
The accessory substance handled is difficult to caused by DMF decomposition caused by sample avoids traditional handicraft, simultaneously, it is contemplated that first order rectifying tower
The top gas scale of construction is larger, and thermal content is high, therefore first order rectifying column is arranged into the rectifying column of heat pump 3, so can effectively improve
Thermal source recovery.
The described rectifying column of heat pump 3 includes the first tower body 1, the first tower reactor 2 and for the heat pump 3 to the heat supply of the first tower reactor 2,
Heat pump 3 is mechanical vapor compressor, and the compression ratio of the mechanical vapor compressor is 1.2-2.3；Described heat pump 3 is connected to
Tower top outlet；Described second level rectifying column includes the second tower body 4 and the second tower reactor 5；Described third level rectifying column includes the
Three tower bodies 6 and the 3rd tower reactor 7；Interconnected evaporator 8 and gas-liquid separator are provided between second tower body 4 and the 3rd tower body 6
9, described evaporator 8 connects with the bottom of the second tower body 4, and the charging aperture of the described tower body 6 of gas-liquid separator 9 and the 3rd connects
It is logical；The top of the second described tower body 4 is provided with the condenser 10 for condensing overhead vapor.
In addition, more conventional as this area, after heat pump 3 is to the first tower reactor 2 supply steam, steam is cold by heat release
Solidifying, phegma of the condensed water part as the first tower body 1, another part is drained.The steam of the top output of second tower body 4
Phegma of the rear portion as the second tower body 4 is condensed by condenser 10, another part is drained；The top of 3rd tower body 6
The whole thermal source as the second tower reactor 5 of the steam of output, by phegma of the exothermic condensation rear portion as the 3rd tower body 6,
Another part is drained.The thermal source of 3rd tower reactor 7 is steam.
Using above-mentioned device, the present embodiment is provided at the DMF waste water that a kind of low pressure heat pump distillation is combined with double-effect rectification
Manage energy saving technique；The technique mainly includes：
DMF waste water is passed through into three-level rectification process, obtains DMF products；
The bottom temperature of first order rectifying column is 65-75 DEG C, and tower top temperature is 60-65 DEG C；
The bottom temperature of second level rectifying column is 65-70 DEG C, and tower top temperature is 55-60 DEG C；
The bottom temperature of third level rectifying column is 125-135 DEG C, and tower top temperature is 85-90 DEG C；
First order rectifying column is the rectifying column of heat pump 3；Tower reactor at least part thermal source of second level rectifying column comes from the third level
The steam of the tower top output of rectifying column；Third level rectifying column is fed using steam feed mode.
First, three-level distillation operation ensure that DMF is stably not easily decomposed, simultaneously as it is more to evaporate section, therefore rectification effect meeting
Very good, DMF of 2 points of the above for producing high-purity is very important.
But thering is three-level distillation operation can not also implement this programme completely, the third level rectifying column of this programme will use gas phase
Charging, it so can preferably ensure the purity for distillating product of third level rectifying column.
In the present embodiment, the rectification temperature on three-level rectifying more will be controlled suitably, otherwise, easily cause DMF
Loss or DMF decomposition.
Secondly, this technique has a preferable energy-saving effect, during three-level distillation operation, first order rectifying column and the third level
Most of calorific value of rectifying column is recuperable, so ensures that very high heat energy utilization effect, and reduce pair
The yield of product, has reached environment protecting.
In order to further improve the effect above, described first order rectifying column, second level rectifying column, in third level rectifying column
It is negative pressure, the pressure value of described negative pressure is 0.02-0.1MPa, and the primary concern factor of the negative pressure value is set in the present embodiment
It is on the premise of meeting temperature requirement needed for heat pump technology and multiple-effect evaporation, reduces system operating temperature as far as possible, reduces DMF
Decomposition amount.
The reflux ratio of first order rectifying column is 0.5-5；The reflux ratio of second level rectifying column is 0.5-3；Third level rectifying column
Reflux ratio is 0.5-3；In general, reflux ratio is bigger, and purity is bigger, and energy consumption is bigger, and number of theoretical plate tends to reduce, and vice versa.
As an important means of the purity for the DMF for improving the present embodiment, described second level rectifying tower bottom product
Entered after the gentle liquid separation of pervaporation in third level rectifying column, DMF gas phases after evaporator 8 and gas-liquid separator 9 are entered
Enter to third level rectifying column；The temperature of evaporation operation is 115-120 DEG C.
This is a very important setting, and evaporator 8 is evaporated to the DMF containing impurity, and gas-liquid separation removes high
Boiling contaminants, then pass through gas-phase feed again, remove high-boiling-point impurity.By this operation, the production of DMF high-purity is realized
Go out.
The characteristics of the characteristics of following table one is enumerated the present embodiment and traditional handicraft.
The contrast table of the present embodiment of table one and traditional handicraft
The technique whole system of embodiment 1 operates under relatively low negative pressure state, can effectively reduce DMF decomposition amount, year
About 75 tons of DMF decomposition amounts are saved, and avoid producing a large amount of more intractable dimethylamine waste waters, solve the environmental protection of DMF wastewater treatments
Problem；System carries pretreatment unit, can effectively solve the problems, such as that equipment scaling, blocking are serious；And according to DMF waste water systems
Characteristic, the processing mode for using heat pump distillation to be combined with double-effect rectification in the different stages, gives full play to two kinds of different process
The advantage of section, energy-saving effect is notable, compared with handling DMF waster water processes with traditional three-effect rectification, saves energy consumption 38%, has notable
Economic and practical and economic benefit.
It is obvious to a person skilled in the art that the utility model is not limited to the details of above-mentioned one exemplary embodiment, and
And in the case of without departing substantially from spirit or essential attributes of the present utility model, it can realize that this practicality is new in other specific forms
Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and is nonrestrictive, this practicality is new
The scope of type limits by appended claims rather than described above, it is intended that the equivalency fallen in claim is contained
All changes in justice and scope are included in the utility model.Any reference in claim should not be considered as limitation
Involved claim.
Claims (5)
1. the DMF wastewater treatment energy savers that a kind of low pressure heat pump distillation is combined with double-effect rectification, it is characterised in that including successively
First order rectifying column, second level rectifying column, the third level rectifying column of connection；Wherein, first order rectifying column is Heat pump assisted column；The
The thermal source of two-stage rectification tower is provided by the overhead vapours of third level rectifying column；Set between second level rectifying column, third level rectifying column
There is the evaporator for making the bottomsstream of second level rectifying column gasify.
2. the DMF wastewater treatment energy savers that low pressure heat pump distillation according to claim 1 is combined with double-effect rectification, it is special
Sign is that described Heat pump assisted column includes the first tower body, the first tower reactor and for the heat pump to tower reactor heat supply, described heat pump
It is connected to tower top outlet.
3. the DMF wastewater treatment energy savers that low pressure heat pump distillation according to claim 2 is combined with double-effect rectification, it is special
Sign is that described second level rectifying column includes the second tower body and the second tower reactor；Described third level rectifying column includes the 3rd tower
Body and the 3rd tower reactor；Be provided between second tower body and the 3rd tower body and connect gas-liquid separator with evaporator, described evaporator and
The bottom connection of second tower body, described gas-liquid separator connect with the charging aperture of the 3rd tower body.
4. the DMF wastewater treatment energy savers that low pressure heat pump distillation according to claim 3 is combined with double-effect rectification, it is special
Sign is that the top of the second described tower body is provided with the condenser for condensing overhead vapor.
5. the DMF wastewater treatment energy savers that low pressure heat pump distillation according to claim 4 is combined with double-effect rectification, it is special
Sign is that the entrance of described first order rectifying column is connected with filter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107311884A (en) * | 2017-06-19 | 2017-11-03 | 广州中科建禹环保有限公司 | DMF wastewater treatments energy saving technique and device that a kind of low pressure heat pump distillation is combined with double-effect rectification |
| CN114773156A (en) * | 2022-03-29 | 2022-07-22 | 上海寰球工程有限公司 | Methylamine device and carbon dioxide method DMF (dimethyl formamide) wastewater treatment system and treatment method |
-
2017
- 2017-06-19 CN CN201720711857.3U patent/CN207002611U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107311884A (en) * | 2017-06-19 | 2017-11-03 | 广州中科建禹环保有限公司 | DMF wastewater treatments energy saving technique and device that a kind of low pressure heat pump distillation is combined with double-effect rectification |
| CN114773156A (en) * | 2022-03-29 | 2022-07-22 | 上海寰球工程有限公司 | Methylamine device and carbon dioxide method DMF (dimethyl formamide) wastewater treatment system and treatment method |
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