CN107596718B - A kind of energy-saving rectifying system recycling organic solvent - Google Patents
A kind of energy-saving rectifying system recycling organic solvent Download PDFInfo
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- CN107596718B CN107596718B CN201710991358.9A CN201710991358A CN107596718B CN 107596718 B CN107596718 B CN 107596718B CN 201710991358 A CN201710991358 A CN 201710991358A CN 107596718 B CN107596718 B CN 107596718B
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Abstract
The present application relates to Technologies for Recovery of Organic Solvents field, a kind of energy-saving rectifying system for recycling organic solvent is specifically disclosed, including lower pressure column, medium pressure column and high-pressure tower, the high-pressure tower include stripping section and rectifying section；The bottom liquid that the overhead vapours of lower pressure column pass through the first condenser and stripping section that are equipped with exchanges heat, the overhead vapours that the bottom liquid of lower pressure column passes through the reboiler and rectifying section that are equipped with exchange heat, the overhead vapours that the bottom liquid of medium pressure column passes through the second condenser, second throttle and the second heat pump and medium pressure column that are equipped with exchange heat, and the stripping section and rectifying section of high-pressure tower pass through the heat exchange inside the first heat pump being equipped with and first throttle valve realization high-pressure tower.Organic solvent is recycled using distillation system of the present invention, less energy consumption, energy-saving effect is good, operating cost is low.
Description
Technical field
The present invention relates to Technologies for Recovery of Organic Solvents field more particularly to a kind of energy-saving rectifying systems for recycling organic solvent
System.
Background technique
Organic solvent is a kind of solvent by organic matter for medium, can direct or indirect dispersion resin, pigments or dyes
Equal high-molecular compounds, and do not react with it, it can be evaporated again after molding, thus be industrially widely used.With China
The usage quantity of the fast development of industrial and agricultural production, organic solvent is also increasing.The daily organic solvent of some integrated mills
Amount is 3~4 tons；Medium factory is 1~2 ton；About several hundred kilograms of midget plant.Type is different but all uses the factory of organic solvent
Such as container plant, copper-clad plate factory, plastic printing factory, Furniture Factory, chemical fibre factory, nationwide.Organic solvent type is numerous
More, under room temperature to be in a liquid state, there is majority toxicity not only can if the spent organic solvent after using arbitrarily is emitted into environment more
It causes largely to waste, can also cause damages to atmosphere and biology.Therefore spent organic solvent is recycled, to environmental protection
It is of great significance with resource-effective.
Rectifying is to carry out mixed vapour in multiple times using energy as process driving force using the boiling point difference of two kinds of substances
The evaporation of the part of partial condensation and mixing liquid, thus the method for separating two kinds of substances, it only needs to provide energy and cooling
Agent can obtain the product of high-purity, and maturation easy to operate is the effective means for separating a variety of organic mixtures.Actual production
In, the form through combining frequently with multiple rectifying columns separates and recovers the mixture of various spent organic solvents.Just because of smart
The motive force that the realization evaporated needs to carry out using energy as process, returns spent organic solvent mixture using multiple rectifying columns
Time receiving, each rectifying column require to consume a large amount of energy, this makes the energy consumption of entire distillation system huge.Therefore, how
The energy consumption that distillation system is reduced when recycling organic solvent using rectificating method, is a urgent problem to be solved.
Summary of the invention
The purpose of the present invention is to provide a kind of energy-saving rectifying systems for recycling organic solvent, organic to solve existing recycling
The huge problem of energy consumption in the distillation system of solvent.
In order to achieve the above object, base case of the invention are as follows: a kind of energy-saving rectifying system for recycling organic solvent, packet
The lower pressure column, medium pressure column and high-pressure tower being sequentially communicated are included, the lower pressure column top is communicated with the first condenser, the lower pressure column bottom
End is communicated with reboiler, and medium pressure tower top end is communicated with the second condenser, and the high-pressure tower includes stripping section and rectifying section, institute
It states stripping section top and is communicated with the first heat pump, the rectifying section bottom end is communicated with first throttle valve, the stripping section top discharging
Enter the bottom end of the rectifying section by first heat pump, the rectifying section bottom end discharging enters by the first throttle valve
The top of the stripping section, the rectifying section top discharging exchange heat by the reboiler and with the discharging of the tower bottom of the lower pressure column
Rear portion is recycled back at the top of rectifying section, and another part is as output of products；Described stripping section bottom end discharging a part passes through institute
It states the first condenser and is recycled back to the bottom of stripping section after exchanging heat with the discharging of the tower top of the lower pressure column, the stripping section bottom end goes out
Another part of material is as output of products；The low pressure column overhead discharges is divided into two parts after first condenser, and one
Part is recycled back at the top of lower pressure column, and a part is used as output of products, and described lower pressure column tower bottom discharging a part is boiled again by described
Device is recycled back to low pressure tower bottom, and another part enters medium pressure tower；Second condenser one end is communicated with the second heat pump, institute
It states the second condenser other end and is communicated with second throttle, a part of medium pressure tower tower bottom discharging successively passes through the second throttling
Valve, the second condenser and the second heat pump cycle go back to medium pressure column bottom, described in another part entrance that medium pressure tower tower bottom discharges
The top of stripping section；The discharging of medium pressure column overhead is by second condenser and one with the discharging of medium pressure tower tower bottom
It is divided into two parts after dividing heat exchange, a part is recycled back at the top of medium pressure column, and a part is used as output of products；The lower pressure column, middle pressure
Tower and stripping section bottom end are also respectively communicated with the first reboiler, the second reboiler and third reboiler for driving.
The working principle of this base case is: by solvent each in ORGANIC SOLVENT MIXTURES to be recycled by its boiling point from small
To big sequence, it is divided into light component, intermediate species and heavy constituent, and this ORGANIC SOLVENT MIXTURES is passed through in lower pressure column.Low
Under the rectifying action for pressing tower, light component will be exported in the form of steam from low pressure column overhead, and is entered in the first condenser and condensed
Heat release becomes liquid form after condensing heat release, and light component a part of liquid form will be used as output of products, another part reflux
Into low pressure column overhead, intermediate species and heavy constituent will be exported from lower pressure column tower bottom in liquid form, output rear portion into
Enter to be heated to form to flow back into after steam the bottom of lower pressure column in reboiler, another part enters progress rectifying separation in medium pressure column；
Under the rectifying action of medium pressure column, intermediate species therefrom will press column overhead to export in the form of steam, and enter the second condenser
Middle condensation heat release becomes liquid form after condensing heat release, and intermediate species a part of liquid form will be used as output of products, another
Into medium pressure column tower top, heavy constituent will be exported from medium pressure column tower bottom partial reflux in liquid form, and output rear portion enters height
The top of the stripping section of tower is pressed, and realizes separation under the rectifying action of stripping section and rectifying section, another part absorbs heat and becomes
Medium pressure column bottom is flowed back at vaporous form；The first low heavy constituent of heavy constituent mid-boiling point by from the top of rectifying section with steam shape
Formula output, becomes liquid form, a portion flows back into rectifying section as output of products, another part after the heat release that is condensed
Top, the second high heavy constituent of heavy constituent mid-boiling point will export in liquid form from the bottom end of stripping section, and output rear portion is made
For output of products, another part absorbs heat and becomes the bottom for flowing back into stripping section after steam, so just realize give up it is organic molten
The separation of agent composition, and spent organic solvent mixture can be recycled after being separated.
When using rectifying column separation organic mixture, the boiling point of organic matter to be separated is higher, the tower top temperature of rectifying column
Degree is higher, so that the operating pressure of rectifying column is bigger, therefore the lower pressure column operating pressure for isolating light component is minimum, separation
The medium pressure column operating pressure of intermediate species is taken second place out, the high-pressure tower operating pressure highest separated to heavy constituent.And lower pressure column
Operating pressure is minimum, and tower top temperature and column bottom temperature are also minimum, and similarly, the tower top temperature and column bottom temperature of medium pressure column are taken second place,
The tower top temperature and column bottom temperature highest of high-pressure tower.Therefore, high-pressure tower overhead vapours can enter the tower in reboiler with lower pressure column
Bottom liquid carries out heat exchange, and after heat exchange, the overhead vapours of high-pressure tower are condensed into liquid due to heat release, lower pressure column
Bottom liquid flashes to gas due to heat absorption, so that the heat carried to the overhead vapours of high-pressure tower has carried out reasonable recycling
It utilizes.Under routine, the heat that the overhead vapours of high-pressure tower carry also has remaining after the bottom liquid for heating lower pressure column
It is remaining, and the bottom liquid of high-pressure tower is then that cannot be introduced into the first condenser to cool down the overhead vapours of lower pressure column, because high
Press the temperature of the overhead liquid of tower that can be higher than the temperature of overhead vapours of lower pressure column, the two can not make lower pressure column by heat exchange
Overhead vapours become liquid, and the bottom liquid of high-pressure tower becomes gas.However, high-pressure tower is split as stripping section from charging place
With two independent sectors of rectifying section because for a rectifying column, the temperature and pressure of rectifying section is always above its stripping section
Temperature and pressure, therefore rectifying section will operate at high temperature under high pressure, and stripping section will operate under low-temp low-pressure, by stripping section
The rising steam on top is passed through the bottom end of rectifying section after the first heat pump is compressed to defined temperature and pressure, by rectifying section bottom
The dropping liq at end the top of stripping section is passed through after first throttle valve decompression cools to specified require, it can be achieved that rectifying section and
The heat exchange of stripping section step by step, is equivalent to and carries out cooling during rolling in rectifying section and remove heat, the heat of removal will be passed to
Stripping section carries out intermediate heating to the liquid in it, the heat transfer temperature difference of this high-pressure tower entirety can as a result reduced, thermodynamic effects
Raising (such power save mode is known as rectifying column partial interior and is thermally integrated) mentions so that making the overhead vapor temperature of rectifying section reduces
Evaporate the tower bottom liquid temperature reduction of section.After the overhead vapor temperature of rectifying section reduces, the heat carried is reduced, and is boiled again entering
It is remaining to heat is not had after the bottom liquid heating of lower pressure column in device, and after the tower bottom liquid temperature reduction of stripping section,
It is cooled down using entering in the first condenser as overhead vapours of the cooling medium to lower pressure column, cooling is understood its own and is heated to form
Steam flows back into the bottom of stripping section.For medium pressure column, the temperature of overhead vapours is high compared with the temperature of bottom liquid, however tower
It is lower to push up the heat quality that steam carries, cannot be used directly for heating its overhead liquid, therefore the second heat pump and the second section is arranged
Valve is flowed, decompression cooling is carried out to medium pressure column bottom liquid using second throttle, to reduce the quality of the heat of its needs, is made
The heat that it can be released in the second condenser by the overhead vapours condensation of medium pressure column is heated into after gas again at gas
It is compressed into the temperature and pressure of needs by the second heat pump, and flows back into the bottom of medium pressure column (such power save mode is known as heat pump
Rectifying).In this way, just realizing the reasonable rule of the heat-exchange network of the distillation system of recycling organic solvent by operation described above
It draws, this system hardly needs offer external energy in stable operation, can substantially reduce the energy consumption of distillation system.
The driving is the sequence of operations for instigating rectifying column to be started to work, when driving to rectifying column, it is necessary to
Liquid in rectifying column is heated, makes to be capable of forming gas-liquid two-phase inside rectifying column, it is therefore desirable in lower pressure column, medium pressure column
Be respectively communicated with the first reboiler, the second reboiler and third reboiler with stripping section bottom end, for drive when to lower pressure column, in
Liquid inside pressure tower and stripping section is heated.After lower pressure column, medium pressure column and high-pressure tower even running, due to entire rectifying
Internal system has been carried out effective heat exchange, does not need external heating, can stop the first reboiler, the second reboiler at this time
With the work of third reboiler.
The beneficial effect of this base case is: the technical program is thermally integrated technology, heat pump using rectifying column partial interior
Distillation technology and multi-effect distillation technology make rational planning for the heat-exchange network of the distillation system of recycling organic solvent, plan
Afterwards, this distillation system is in addition to needing to provide external energy when driving, and when stable operation almost no longer needs to provide outside heat,
Energy consumption is extremely low, and compared with prior art, this distillation system has better energy-saving effect, and operating cost is lower, and investment more saves.
Preferred embodiment one: as the preferred of basic scheme, first condenser and the second condenser lower end are separately connected
There are the first reflux surge tank and the second reflux surge tank；The tower top discharging of the lower pressure column enters after first condenser
The first reflux surge tank, and a part being recycled back at the top of lower pressure column is divided into and as production by the first reflux surge tank
Another part of product output；The tower top of medium pressure tower discharges enters the second reflux buffering after second condenser
Tank, and a part being recycled back at the top of medium pressure column is divided into and as another portion of output of products by the second reflux surge tank
Point；The tower top of the rectifying section is equipped with third reflux surge tank, and the tower top discharging of the rectifying section is laggard by the reboiler
Enter the third reflux surge tank, and a part and conduct being recycled back at the top of rectifying section are divided by third reflux surge tank
Another part of output of products.
Setting reflux surge tank can be preferably to the overhead materials flowed out from condenser after the overhead condenser of rectifying column
Material is shunted, and plays buffer function when shunting, and the overhead vapours for not being condensed by the condenser into liquid on a small quantity is made also
Liquid is gradually condensed into tank.
Preferred embodiment two: preferably one it is preferred, the first reflux surge tank is communicated with for will be by the
A part of the low pressure column overhead discharging of one reflux surge tank is pumped into the pump of the No.1 at the top of lower pressure column, the second reflux surge tank
No. two pumps for being pumped into a part for passing through the medium pressure column tower top discharging of the second reflux surge tank at the top of medium pressure column are communicated with,
The third reflux surge tank is communicated with for a part for passing through the rectifying section tower top discharging of third reflux surge tank to be pumped into
No. three pumps at the top of rectifying section.
The No.1 pump and No. two pumps of setting can effectively improve the reflux efficiency of tower top discharging, to improve the separation of rectifying column
Efficiency.
Preferred embodiment three: as the preferred of basic scheme, the lower pressure column, medium pressure column and high-pressure tower are packed tower or plate
Formula tower.
Rectifying column mainly has packed tower and plate column two types, this two types has their own advantages, and industrially obtains
It is widely applied, installation, operating technology are mature.
Preferred embodiment four: further including being respectively used to store the lower pressure column, medium pressure column and essence as the preferred of basic scheme
Section first products pot, second products pot and a third products pot of the tower top discharging as that a part of product is evaporated, and for storing up
Deposit the 4th products pot of that a part of the stripping section tower bottom discharging as product.
The products pot of setting can be stored and be recycled to the organic solvent separated by each rectifying column, and organic solvent is facilitated
Recycling.
Detailed description of the invention
Fig. 1 is a kind of separation process figure for the energy-saving rectifying system embodiment for recycling organic solvent of the present invention.
Specific embodiment
Below by specific embodiment, the present invention is described in further detail:
Appended drawing reference in Figure of description includes: lower pressure column 1, the first condenser 11, first reflux surge tank 12, No.1
Pump 13, reboiler 14, the first reboiler 15, the first products pot 16, medium pressure column 2, the second condenser 21, second reflux surge tank
22, No. three pumps 23, second throttle 24, the second heat pump 25, the second reboiler 26, the second products pot 27, high-pressure tower 3, stripping section
31, rectifying section 32, the first heat pump 311, third reboiler 312, the 4th products pot 313, first throttle valve 321, third reflux are slow
Rush tank 323, third products pot 324.
The present embodiment is by taking the separation and recovery of the mixture of organic solvent ether, methanol, toluene and ethylene glycol as an example.
As shown in Figure 1, the energy-saving rectifying system of recycling ether, methanol, toluene and ethylene glycol mixture, including be sequentially communicated
Lower pressure column 1, medium pressure column 2 and high-pressure tower 3, lower pressure column 1, medium pressure column 2 and high-pressure tower 3 are kickboard tower, the connection of 1 top of lower pressure column
There are the first condenser 11,1 bottom end of lower pressure column to be communicated with reboiler 14,2 top of medium pressure column is communicated with the second condenser 21, high-pressure tower
3 include stripping section 31 and rectifying section 32, and 31 top of stripping section is communicated with the first heat pump 311, and 32 bottom end of rectifying section is communicated with first
Throttle valve 321, the discharging of 31 top of stripping section enter the bottom end of rectifying section 32, the discharging of 32 bottom end of rectifying section by the first heat pump 311
By first throttle valve 321 enter stripping section 31 top, 32 top of rectifying section discharging by reboiler 14 and with lower pressure column 1
Tower bottom discharging heat exchange rear portion is recycled back to 32 top of rectifying section, and another part is as output of products；The discharging of 31 bottom end of stripping section
A part by the first condenser 11 and be recycled back to the bottom of stripping section 31, stripping section after the discharging heat exchange of the tower top of lower pressure column 1
Another part of 31 bottom ends discharging is as output of products；The discharging of 1 tower top of lower pressure column is divided into two parts after the first condenser 11,
A part is recycled back to 1 top of lower pressure column, and a part is used as output of products, and 1 tower bottom of lower pressure column discharging a part passes through reboiler 14
It is recycled back to 1 bottom of lower pressure column, another part enters medium pressure column 2；Second condenser, 21 one end is communicated with the second heat pump 25, and second is cold
21 other end of condenser is communicated with second throttle 24, and a part of 2 tower bottom of medium pressure column discharging successively passes through second throttle 24, the
Two condensers 21 and the second heat pump 25 are recycled back to 2 bottom of medium pressure column, and another part of 2 tower bottom of medium pressure column discharging enters stripping section 31
Top；It is divided into two after a part heat exchange that 2 tower top of medium pressure column discharges by the second condenser 21 and with the discharging of 2 tower bottom of medium pressure column
Part, a part are recycled back to 2 top of medium pressure column, and a part is used as output of products；31 bottom end of lower pressure column 1, medium pressure column 2 and stripping section
Also it is respectively communicated with the first reboiler 15, the second reboiler 26 and third reboiler 312 for driving；First condenser, 11 He
Second condenser, 21 lower end is connected separately with the first reflux surge tank 12 and the second reflux surge tank 22, and the tower top of lower pressure column 1 goes out
Material enters the first reflux surge tank 12 after the first condenser 11, and is divided by the first reflux surge tank 12 to be recycled back to lower pressure column
A part at the top of 1 and another part as output of products；The tower top discharging of medium pressure column 2 enters after the second condenser 21
Second reflux surge tank 22, and divided by the second reflux surge tank 22 to be recycled back to a part at 2 top of medium pressure column and as product
Another part of output；The tower top of rectifying section 32 is equipped with third reflux surge tank 323, and the tower top discharging of rectifying section 32 by boiling again
Enter third reflux surge tank 323 after device 14, and is divided by third reflux surge tank 323 to be recycled back to one of 32 top of rectifying section
Point and as output of products another part；First reflux surge tank 12 is communicated with for that will pass through the first reflux surge tank 12
A part of 1 tower top of lower pressure column discharging is pumped into the No.1 pump 13 at the top of lower pressure column 1, and the second reflux surge tank 22 is communicated with for will
A part by 2 tower top of the medium pressure column discharging of the second reflux surge tank 22 is pumped into No. two pumps at 2 top of medium pressure column, third reflux
Surge tank 323 is communicated with for a part for passing through 32 tower top of the rectifying section discharging of third reflux surge tank 323 to be pumped into rectifying
No. three pumps 23 at 32 top of section；The distillation system further includes being respectively used to storage lower pressure column 1,32 tower of medium pressure column 2 and rectifying section
First products pot 16, second products pot 27 and third products pot 324 of the ejection material as that a part of product, and for storing up
Deposit fourth products pot 313 of 31 tower bottom of the stripping section discharging as that a part of product.
When it is implemented, by ether, methanol, toluene and ethylene glycol press the sequence of its boiling point from small to large, be divided into light component,
Intermediate species and heavy constituent, ether, methanol, the boiling point of toluene and ethylene glycol are as shown in table 1, as can be seen from Table 1, ether boiling point
It is minimum, it can be used as light component, methanol boiling point takes second place, and can be used as intermediate species, and toluene boiling point is lower than ethylene glycol, as the first recombination
Point, ethylene glycol boiling point highest, as the second heavy constituent.The mixture of ether, methanol, toluene and ethylene glycol is passed through lower pressure column 1
In, and the first reboiler 15, the second reboiler 26 and third reboiler 312 is successively made to work, to lower pressure column 1, medium pressure column 2 and mention
It evaporates section 31 to be heated, so that lower pressure column 1, medium pressure column 2 and high-pressure tower 3 be made to start to carry out mask work, lower pressure column 1, medium pressure column 2
After 3 even running of high-pressure tower, the work of the first reboiler 15, the second reboiler 26 and third reboiler 312 can be stopped.?
Under the rectifying action of lower pressure column 1, ether will be exported in the form of steam from 1 tower top of lower pressure column, and be entered in the first condenser 11
Heat release is condensed, becomes liquid form after condensing heat release, the ether of liquid form enters in the first reflux surge tank 12 and is divided into two
Point, a part is stored as ether output of products into the first products pot 16, and another part is pumped by No.1 pump 13 and by No.1
13 are pumped into 1 tower top of lower pressure column, and methanol, toluene and ethylene glycol will be exported from 1 tower bottom of lower pressure column in liquid form, after output
A part enters the bottom for being heated to form in reboiler 14 and flowing back into lower pressure column 1 after steam, another part enter in medium pressure column 2 into
Row rectifying separation；Under the rectifying action of medium pressure column 2, methanol will be exported in the form of steam from 2 tower top of medium pressure column, and enter the
Heat release is condensed in two condensers 21, becomes liquid form after condensing heat release, the methanol of liquid form enters the second reflux surge tank
It is divided into two parts in 22, a part is output in the second products pot 27 as methanol product and stores, and another part is by No. two pumps
And be pumped into 2 tower top of medium pressure column by No. two, toluene and ethylene glycol will be exported from 2 tower bottom of medium pressure column in liquid form, output
Rear portion enters the top of the stripping section 31 of high-pressure tower 3, and realizes and divide under the rectifying action of stripping section 31 and rectifying section 32
From another part enters in the second condenser 21 after the decompression of throttle valve cooling, absorbs 2 tower of medium pressure column as cooling medium
2 overhead vapours of medium pressure column are condensed into liquid by the heat for pushing up steam, and its own becomes steam after absorbing heat, by heat pump
Increasing temperature and pressure after flow back into 2 bottom of medium pressure column；Toluene will export in vapour form from the top of rectifying section 32, be output and then enter
The bottom liquid of lower pressure column 1 is heated into steam as heat medium in reboiler 14, is condensed into liquid after its own heat release
Form, the toluene of liquid form enter in third reflux surge tank 323 and are divided into two parts, and a portion is as toluene product
It being output in third products pot 324 and stores, another part is pumped into the top of rectifying section 32 by No. three pumps 23 and by No. three pumps 23,
Ethylene glycol will export in liquid form from the bottom end of stripping section 31, and output rear portion is output to the 4th production as ethylene glycol product
It is stored in product tank 313, another part enters in the first condenser 11 to exchange heat with the overhead vapours of lower pressure column 1, by the tower of lower pressure column 1
Top steam is condensed into liquid, its own absorbs heat and becomes the bottom for flowing back into stripping section 31 after steam；31 top of stripping section
Rise the bottom end that steam is passed through rectifying section 32 after the first heat pump 311 is compressed to defined temperature and pressure, 32 bottom of rectifying section
The dropping liq at end is passed through the top end of stripping section 31 after first throttle valve 321 depressurizes and cools to specified require, thus real
The heat exchange of existing rectifying section 32 and stripping section 31 step by step, reduces the whole heat transfer temperature difference of high-pressure tower 3, makes the tower bottom of stripping section 31
Liquid can realize heat exchange with the overhead vapours of lower pressure column 1, and enable the tower bottom of the overhead vapours of rectifying section 32 with lower pressure column 1
Liquid realizes heat exchange.
The mixture of ether, methanol, toluene and ethylene glycol, separated ethyl ether and ethyl, first are separated using above-mentioned energy-saving rectifying system
The purity of alcohol, toluene and ethylene glycol can reach 99%, and energy consumed by separating separates ether, methanol, toluene with tradition
It is compared with the distillation system of ethylene glycol mixture, reduces 50% or more, energy-saving effect is significant.
1 ether of table, methanol, toluene and ethylene glycol boiling point
| Component | Ether | Methanol | Toluene | Ethylene glycol |
| Boiling point (DEG C) | 34.6 | 64.5 | 110.63 | 197.85 |
What has been described above is only an embodiment of the present invention, and the common sense such as well known specific structure and characteristic are not made herein in scheme
Excessive description.It, without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are made, these also should be considered as protection scope of the present invention, these all will not influence what the present invention was implemented
Effect and patent practicability.
Claims (5)
1. it is a kind of recycle organic solvent energy-saving rectifying system, which is characterized in that including be sequentially communicated lower pressure column, medium pressure column and
High-pressure tower, the lower pressure column top is communicated with the first condenser, the lower pressure column bottom end is communicated with reboiler, medium pressure tower top
End is communicated with the second condenser, and the high-pressure tower includes stripping section and rectifying section, and the stripping section top is communicated with the first heat pump,
The rectifying section bottom end is communicated with first throttle valve, and the stripping section top discharging enters the rectifying by first heat pump
The bottom end of section, the rectifying section bottom end discharging enter the top of the stripping section, the rectifying section by the first throttle valve
Top discharging is recycled back at the top of rectifying section by the reboiler and with the tower bottom of lower pressure column discharging heat exchange rear portion, separately
A part is used as output of products；Stripping section bottom end discharging a part by first condenser and with the lower pressure column
The bottom of stripping section is recycled back to after tower top discharging heat exchange, another part of the stripping section bottom end discharging is as output of products；Institute
It states the discharging of low pressure column overhead and is divided into two parts after first condenser, a part is recycled back at the top of lower pressure column, a part
As output of products, described lower pressure column tower bottom discharging a part is recycled back to low pressure tower bottom, another part by the reboiler
Into medium pressure tower；Second condenser one end is communicated with the second heat pump, and the second condenser other end is communicated with
Two throttle valves, a part of medium pressure tower tower bottom discharging are successively passed through second throttle, the second condenser and the second heat pump and are followed
Another part of loopback medium pressure column bottom, the discharging of medium pressure tower tower bottom enters the top of the stripping section；Medium pressure tower tower
Ejection is divided into two parts after expecting a part heat exchange by second condenser and with the discharging of medium pressure tower tower bottom, a part
It is recycled back at the top of medium pressure column, a part is used as output of products；The lower pressure column, medium pressure column and stripping section bottom end have also been respectively communicated with
The first reboiler, the second reboiler and third reboiler for driving.
2. a kind of energy-saving rectifying system for recycling organic solvent as described in claim 1, which is characterized in that first condensation
Device lower end is communicated with the first reflux surge tank, and the second condenser lower end is communicated with the second reflux surge tank；The tower of the lower pressure column
Ejection material enters the first reflux surge tank after first condenser, and is divided by the first reflux surge tank and following
A part at the top of loopback lower pressure column and another part as output of products；The tower top discharging of medium pressure tower is by described the
Enter the second reflux surge tank after two condensers, and is divided by the second reflux surge tank and being recycled back at the top of medium pressure column
Another part a part of and as output of products；The tower top of the rectifying section is equipped with third reflux surge tank, the rectifying section
Tower top discharge and enter the third after the reboiler and flow back surge tank, and be divided into and being followed by third reflux surge tank
A part at the top of loopback rectifying section and another part as output of products.
3. a kind of energy-saving rectifying system for recycling organic solvent as claimed in claim 2, which is characterized in that first reflux
Surge tank is communicated with for a part for passing through the low pressure column overhead discharging of the first reflux surge tank to be pumped at the top of lower pressure column
No.1 pump, the second reflux surge tank are communicated with one of the discharging of the medium pressure column tower top for that will pass through the second reflux surge tank
Wheel cylinder enters No. two pumps at the top of medium pressure column, and the third reflux surge tank is communicated with the essence for that will pass through third reflux surge tank
Evaporate No. three pumps that section a part of tower top discharging is pumped at the top of rectifying section.
4. a kind of energy-saving rectifying system for recycling organic solvent as described in claim 1, which is characterized in that the lower pressure column,
Medium pressure column and high-pressure tower are packed tower or plate column.
5. a kind of energy-saving rectifying system for recycling organic solvent as described in claim 1, which is characterized in that further include using respectively
In storing first products pot as that a part of product of the lower pressure column, medium pressure column and the discharging of rectifying section tower top, the second production
Product tank and third products pot, and the 4th product for storing that a part of the stripping section tower bottom discharging as product
Tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN101492346A (en) * | 2009-02-25 | 2009-07-29 | 天津凯赛特科技有限公司 | Multi/dual-purpose distillation system for methanol |
| US8877987B2 (en) * | 2011-08-03 | 2014-11-04 | Celanese International Corportation | Process for producing anhydrous ethanol using extractive distillation column |
| CN204727801U (en) * | 2015-05-12 | 2015-10-28 | 中建安装工程有限公司 | The device of organic sulfide in a kind of deep removal methyl tertiary butyl ether |
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