CN106823434A - Continous way double tower distilling apparatus and distillating method - Google Patents
Continous way double tower distilling apparatus and distillating method Download PDFInfo
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- CN106823434A CN106823434A CN201710009401.7A CN201710009401A CN106823434A CN 106823434 A CN106823434 A CN 106823434A CN 201710009401 A CN201710009401 A CN 201710009401A CN 106823434 A CN106823434 A CN 106823434A
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- foreshot
- tower
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a kind of continous way double tower distilling apparatus and distillating method.Continous way double tower distilling apparatus, including the tower reactor with heat supply chuck, product tower, foreshot tower, foreshot temperature controller, product temperature controller, foreshot cooler, reactor product cooler, foreshot receiving tank, product receiving tank, continuous feed groove, emptying mechanism；Foreshot tower is arranged in tower reactor top side, and product tower is arranged in tower reactor top opposite side；Foreshot tower has been sequentially arranged foreshot outlet, charging aperture, first circulation introducing port from top to bottom, and the offside of first circulation introducing port has second circulation introducing port.The present invention is capable of achieving substantially without middle control analysis, shares a tower reactor, and foreshot tower goes out lower boiling foreshot.
Description
Technical field
The present invention relates to a kind of distilling apparatus, specifically a kind of device distilled according to different boiling and the dress
Put the distillating method of use.
Background technology
Destilling tower is widely used in the fields such as chemical industry, metallurgy, light industry, and destilling tower is that a kind of tower vapour-liquid for carrying out rectifying connects
Device is touched, rectifying column is also called, there is plate column and two kinds of main Types of packed tower, continuous rectification can be divided into according to mode of operation again
Tower and batch fractionating tower.Steam is entered by bottom of towe, and counter current contacting is carried out with lower descending liquid, during two are in contact, easily waving in lower descending liquid
Hair component is that low boiling component is constantly shifted with steam, and the difficult volatile component in steam is high boiling component constantly with decline
Liquid is shifted, and steam is closer to tower top, and its volatile components concentration is higher, and lower descending liquid is closer to bottom of towe, and its difficult volatile component is then
More it is enriched with, so as to reach the purpose of Component seperation.Volatile components enter condenser, the liquid of condensation by the steam that tower top rises
A part as phegma return tower top enter rectifying column in, remaining part then as distillate take out.Bottom of towe outflow
Liquid, part feeding reboiler therein, after thermal evaporation, steam is returned in tower, and another part liquid takes out as kettle raffinate.
Fig. 4 is refer to, the traditional distillation equipment in figure is essentially a tower reactor, a tower body, a condenser, two
Recipient, realizes that the kettle of batch (-type) one distills, and charging is batch (-type), and discharging is interim, takes difference to evaporate by quality requirements
The interception of part.The content of each interception thing is graded, and the fraction that early stage goes out i.e. foreshot, its low boiling content is high, the later stage
The i.e. rear fraction of the fraction for going out, its higher boiling content is high, and product takes low boiling and high boiling mid portion, and front and rear fraction then remains unchanged
Repeat to distill.Generally speaking, high energy consumption, low yield feeds intake frequently aforesaid way, the continuous tracking of product middle control analysis requirement.By
In often batch (-type), even continous way, tower body height is often high, single batch products volume and tower reactor volume phase
When.
Traditional single column batch distillation device has the disadvantage that：Tower reactor volume is relatively large, substantially with product collector under
Claim product receiver quite, when distillation is to the later stage, liquid level is quite shallow in kettle and mass-and heat-transfer is unstable in causing kettle, and hot-spot can
Material is caused to decompose, height boiling vaporization；Heat supply chuck can use the modes such as steam, conduction oil, electrical heating.Tower body is single column, preceding to evaporate
Part is low boiling component, product, or even rear fraction is that high boiling component all goes out from this tower, forms pipeline monitor pollution, while producing
Product content rises in gradient, need to see the change of tower top temperature, ceaselessly middle control detection and analysis.Cooler is unique cooler, extremely
Residual is had in angle.
The content of the invention
It is an object of the invention to provide a kind of continous way double tower distilling apparatus, how solution makes foreshot, product, rear fraction
Three components are while the technical problem of continuous discharge.
It is a further object to provide a kind of continous way double tower distillating method, solution how to make foreshot, product,
The component of fraction three is while the technical problem of continuous discharge afterwards.
Continous way double tower distilling apparatus, including the tower reactor with heat supply chuck, product tower, foreshot tower, foreshot temperature control
Device, product temperature controller, foreshot cooler, reactor product cooler, foreshot receiving tank, product receiving tank, continuous feed groove, emptying
Mechanism；Foreshot tower is arranged in tower reactor top side, and product tower is arranged in tower reactor top opposite side；Foreshot tower from top to bottom according to
Secondary to be disposed with foreshot outlet, charging aperture, first circulation introducing port, there is the offside of first circulation introducing port second circulation to import
Mouthful；Product tower is disposed with products export, the 3rd circulation introducing port from top to bottom；Above-mentioned foreshot outlet is cold by foreshot
But device and valve are connected with foreshot receiving tank, the outlet of above-mentioned foreshot simultaneously by foreshot cooler and another valve with
First circulation introducing port is connected；The said goods outlet is connected by reactor product cooler and valve with product receiving tank, the said goods
Outlet is connected with second circulation introducing port, the 3rd circulation introducing port respectively by reactor product cooler and valve；Continuous feed groove with
Charging aperture is connected；Above-mentioned foreshot receiving tank, product receiving tank, foreshot cooler, reactor product cooler connect with emptying mechanism
It is logical.
The emptying mechanism is blow-down pipe or vacuum tube.
There is visor between the continuous feed groove and charging aperture.
There is visor between the foreshot receiving tank and foreshot cooler.
There is visor between the foreshot cooler and first circulation introducing port.
There is visor between the reactor product cooler and second circulation introducing port.
There is visor between the reactor product cooler and product receiving tank.
Continous way double tower distillating method, comprises the following steps：
A, material is imported into tower reactor by continuous feed groove by charging aperture, the heating medium in heat supply chuck is heated
Make material evaporation；
B, the valve closed between foreshot cooler and foreshot receiving tank are not closed, and the material in tower reactor is due to being heated
Issue additional into foreshot tower so as to be contacted with the material of charging aperture so that being evaporated before lower boiling in the material flowed into from charging aperture
Part evaporation flows into foreshot exit and constitutes circulation into foreshot tower is interior by first circulation introducing port；What charging aperture was flowed into
Product and high boiling rear fraction in material in addition to lower boiling foreshot enter in tower reactor；
C, the valve closed between reactor product cooler and product receiving tank；Material in tower reactor is due to additional issue into product tower of being heated
Interior, material imported into second circulation introducing port and constitutes circulation from products export, reactor product cooler；In addition, material from products export,
Reactor product cooler imported into the 3rd circulation introducing port；
Visor between d, observation foreshot cooler and foreshot receiving tank, if visor observation foreshot is qualified, closes
Valve between foreshot cooler and second circulation introducing port, opens the valve between foreshot cooler and foreshot receiving tank
Door is so as to realize the lasting discharging of foreshot；Visor between observation reactor product cooler and product receiving tank, if visor is observed
Product is qualified, then the valve closed between reactor product cooler and second circulation introducing port and the 3rd circulation introducing port, opens product
Valve between cooler and product receiving tank is so as to realize the lasting discharging of product；
E, high boiling rear fraction stay in the discharge of tower reactor bottom.
The beneficial effects of the invention are as follows：The device of invention, substantially without middle control analysis, is shared by the way of continuous feed
One tower reactor, foreshot tower goes out lower boiling foreshot, and product tower goes out the product of middle boiling point, and tower reactor goes out high boiling height boiling
Thing, so as to realize efficiently separating for three components, product quality quite stable.Compared to traditional tower reactor, present apparatus tower reactor is small, and it can drop
Be at half the height of tower, reduces mounting cost, reduces the security risk such as lightning-arrest；Liquid level maintains stabilization, and temperature stabilization can be effectively steady
Determine component vapor partial pressure, so that it is guaranteed that product quality, can reduce the interception of component different content, single batch products performance is
The several times or decades of times of tower reactor volume.
Brief description of the drawings
Fig. 1 is the schematic diagram in the work of this case continous way double tower distilling apparatus；
Fig. 2 is the schematic diagram that this case continous way double tower distilling apparatus carries out that foreshot and product are collected；
Fig. 3 is the schematic diagram that another continous way double tower distilling apparatus carries out that foreshot and product are collected；
Fig. 4 is the schematic diagram of traditional continous way double tower distilling apparatus；
1. tower reactors in figure, 2. 101. heat supply chucks, product tower, 21. products exports, 22. the 3rd circulation introducing ports, 3.
Foreshot tower, the outlet of 31. foreshots, 32. charging apertures, 33. first circulation introducing ports, 34. second circulation introducing ports, 4.
Foreshot temperature controller, 5. product temperature controller, 6. foreshot cooler, 7. reactor product cooler, 8. foreshot receiving tank, 9.
Product receiving tank, 10. continuous feed groove, 11. emptying mechanisms, 12. visors.
Specific embodiment
Fig. 1 to Fig. 3 is refer to, the continous way double tower distilling apparatus in figure, including a tower reactor with heat supply chuck 101
1st, 2, one, product tower, 3, one, the foreshot tower product temperature controller 5, of a foreshot temperature controller 4, foreshot cooling
The continuous feed groove 10, one of product receiving tank 9, of foreshot receiving tank 8, of reactor product cooler 7, of device 6, is put
Empty mechanism 11, multiple valves, multiple visors 12, multiple connecting pipes.
Tower reactor 1 regards height boiling ratio-dependent size, and bigger continuous product amount of producing is bigger, but is more difficult to regulation stabilization.Heat supply chuck
101, more stable, product discharge amount and quality can be input into using the mode such as steam, conduction oil, electrical heating, depending on required separation temperature
It is more stable.
The diameter of product tower 2 is production capacity design, highly determines that filler is ripple packing regarding product separating effect.
Foreshot tower 3, diameter is designed regarding production capacity, highly fixed regarding foreshot separating effect, and filler is ripple packing, and diameter is former
It is then upper to be more than or equal to product tower, also can be small.
Foreshot temperature controller 4, you can the content of foreshot, temperature stabilization, stable content in control foreshot tower 3.Before this
Fraction temperature controller 4 only passes through foreshot, and intermediate products and higher boiling do not pass through then.
Product temperature controller 5, you can control product content, without middle control.
Foreshot cooler 6 can control foreshot temperature, can be in -10 ~ 100 degree of selections, to prevent foreshot volatilization loss
And blocking.
Reactor product cooler 7 can allow intermediate products to pass through, and foreshot and rear fraction do not pass through then, and the reactor product cooler 7 is controllable
The temperature of the product processed material different to adapt to fusing point, can be in -10 ~ 100 degree of selections, with blockage prevention cooler and discharge pipe.
Foreshot receiving tank 8 can in preceding part ratio, production capacity factor make, can many parallel connections cut with increasing lot number amount and reduction
Change, the off-time such as blowing.
Product receiving tank 9 can by production capacity, the big little makings of lot number, can many parallel connections with increase lot number amount and reduce switch, bag
The off-times such as dress.
Continuous feed groove 10 can in a steady stream supplement treating material, can also reenter foreshot outlet circulation come before reaching
Product content in fraction, feed material can be preheated in feed well, and preheater can be also added after feed flow meter.
Product tower 2 and the connecting tube of foreshot tower 3, can effectively save distillation and drive starting stage, process stage out of control etc.
Emergency action when unusual fluctuation occur in product content, outward appearance under improper factor, can effectively reduce non-qualified products and be received into product
The consequence of device, can also shorten the time needed for product distillation recovers normal discharging.
With many component liquid mixtures contained after chemical products synthesis in above-mentioned continuous feed groove 10, this case is designed into
It is separated；Many component materials divide into three classes by boiling point, and purpose product is product, are preceding less than purpose product boiling point
Fraction, is rear fraction higher than purpose product.The material that the present invention is distinguished suitable for all energy by this.
Three kinds of components during foreshot tower 3 is arranged in the top side of tower reactor 1 so convenience to mixture are separated, product
Tower 2 is arranged in the top opposite side of tower reactor 1 and is set with 3 one-tenth symmetrical expressions of foreshot tower and so conveniently product is separated and collected.
Foreshot tower 3 has been sequentially arranged foreshot outlet 31, charging aperture 32, first circulation introducing port 33 from top to bottom, before being achieved in that
The circulation of fraction.The offside of first circulation introducing port 33 has second circulation introducing port 34, so convenient to be flowed from reactor product cooler 7
The product for going out is separated again into foreshot tower 3 is interior.Product tower 2 is disposed with products export the 21, the 3rd from top to bottom
Circulation introducing port 22, is achieved in that the separation circulation of product.Above-mentioned foreshot outlet 31 by foreshot cooler 6 and valve with
Foreshot receiving tank 8 is connected, and receiving tank is also referred to as collecting tank, is achieved in that the reception of foreshot.Above-mentioned foreshot outlet 31 is simultaneously
Connected with first circulation introducing port 33 by foreshot cooler 6 and another valve；It is achieved in that the circulation of foreshot.It is above-mentioned
Products export 21 is connected by reactor product cooler 7 and valve with product receiving tank 9, is achieved in that the reception of product.The said goods
Outlet 21 circulates introducing port 22 and connects with second circulation introducing port the 34, the 3rd respectively by reactor product cooler 7 and valve；So exist
Persistent collection early stage, realizes that the multiple evaporative filtration of product is collected.Continuous feed groove 10 is connected with charging aperture 32, so by material
It imported into tower reactor 1.Above-mentioned foreshot receiving tank 8, product receiving tank 9, foreshot cooler 6, reactor product cooler 7 with emptying
Such as blow-down pipe or vacuum tube of mechanism 11 is connected, and realizes the trouble free service of all parts.Each flow is observed for convenience, even
Continuous between feed well 10 and charging aperture 32, between foreshot receiving tank 8 and foreshot cooler 6, foreshot cooler 6 and first
Between circulation introducing port 33, between reactor product cooler 7 and second circulation introducing port 34, reactor product cooler 7 and product receiving tank 9 it
Between have visor 12.
The continous way double tower distillating method of the present apparatus, comprises the following steps：
A, material is imported into tower reactor 1 by continuous feed groove 10 by charging aperture 32, to the heating medium in heat supply chuck 101
Carrying out heating makes material evaporation；Must wherein be kept in tower reactor in tower reactor as inert gas shielding；
B, the valve closed between foreshot cooler 6 and foreshot receiving tank 8 are not closed, the material in tower reactor 1 due to
Additional issue of being heated enters in foreshot tower 3 so as to low boiling during the material for causing to flow into from charging aperture 32 is contacted with the material of charging aperture 32
The foreshot of point is evaporated and flows at foreshot outlet 31 and followed into composition in foreshot tower 3 by first circulation introducing port 33
Ring；Product and high boiling rear fraction in the material that charging aperture 32 is flowed into addition to lower boiling foreshot enter in tower reactor 1；
C, the valve closed between reactor product cooler 7 and product receiving tank 9；Material in tower reactor 1 is produced because additional issue of being heated enters
In product tower, material imported into second circulation introducing port 34 and constitutes circulation from products export 21, reactor product cooler 7；In addition, material from
Products export 21, reactor product cooler 7 imported into the 3rd circulation introducing port 22；
Visor 12 between d, observation foreshot cooler 4 and foreshot receiving tank 8, if the observation foreshot of visor 12 is qualified,
The valve then closed between foreshot cooler 6 and second circulation introducing port 34, opens foreshot cooler 6 and is received with foreshot
Valve between tank 8 is so as to realize the lasting discharging of foreshot；Visor between observation reactor product cooler 7 and product receiving tank 9
12, if the observation product of visor 12 is qualified, closes reactor product cooler 7 and circulate introducing port with second circulation introducing port 34 and the 3rd
Valve between 22, opens the valve between reactor product cooler 7 and product receiving tank 9 so as to realize the lasting discharging of product；
E, high boiling rear fraction stay in the discharge of tower reactor bottom.
Above-mentioned specific operating procedure is：Fed in continuous feed groove 10 to tower reactor 1, then heat supply chuck 101 starts to rise
Temperature, product tower 2 and foreshot tower 3 have solvent vapo(u)r rising, and product temperature controller 5 and foreshot temperature controller 4 are controlled temperature, opened
Reactor product cooler 7 and foreshot cooler 6 are opened, waits reactor product cooler 7 and foreshot cooler 6 to have liquid discharge, before product tower 2
Face out be mixed solvent, by connecting tube, return to foreshot tower 3, wait the product out of product tower 2 comply fully with index will
Ask, close connecting tube, open product receiving tank 9, be at this moment product continuous discharge, foreshot receiving tank 8 can be to be kept on all
, by adjusting continuous feed flow, waiting after stabilization, only remaining product and high-boiling components in tower reactor 1, continuous feed groove 10 are come in
Material, heated by product and high-boiling components steam, low-boiling-point substance is directly cooled down by foreshot cooler 6, connect by foreshot
Closed cans 8 collects front-end volatiles, thus can be with continuous feed, continuous discharge, after waiting high-boiling components to be enriched with to a certain extent, can be from tower
Discharging under kettle 1.
Claims (9)
1. continous way double tower distilling apparatus, it is characterised in that：Including the tower reactor with heat supply chuck, product tower, foreshot tower, preceding
Fraction temperature controller, product temperature controller, foreshot cooler, reactor product cooler, foreshot receiving tank, product receiving tank, continuously enter
Hopper, emptying mechanism；Foreshot tower is arranged in tower reactor top side, and product tower is arranged in tower reactor top opposite side；Foreshot tower
Foreshot outlet, charging aperture, first circulation introducing port it have been sequentially arranged from top to bottom, the offside of first circulation introducing port has the
Two circulation introducing ports；Product tower is disposed with products export, the 3rd circulation introducing port from top to bottom；Above-mentioned foreshot outlet is logical
Cross foreshot cooler and valve to be connected with foreshot receiving tank, above-mentioned foreshot outlet is while by foreshot cooler and separately
One valve is connected with first circulation introducing port；The said goods outlet is connected by reactor product cooler and valve with product receiving tank
Logical, the said goods outlet is connected with second circulation introducing port, the 3rd circulation introducing port respectively by reactor product cooler and valve；Even
Continuous feed well is connected with charging aperture；Above-mentioned foreshot receiving tank, product receiving tank, foreshot cooler, reactor product cooler with
Emptying mechanism connection.
2. the continous way double tower distilling apparatus according to claim 1, it is characterised in that：The emptying mechanism is blow-down pipe
Or vacuum tube.
3. the continous way double tower distilling apparatus according to claim 1, it is characterised in that：The continuous feed groove and charging
There is visor between mouthful.
4. the continous way double tower distilling apparatus according to claim 1, it is characterised in that：The foreshot receiving tank with it is preceding
There is visor between fraction cooler.
5. the continous way double tower distilling apparatus according to claim 1, it is characterised in that：The foreshot cooler and
There is visor between one circulation introducing port.
6. the continous way double tower distilling apparatus according to claim 1, it is characterised in that：The reactor product cooler and second
There is visor between circulation introducing port.
7. the continous way double tower distilling apparatus according to claim 1, it is characterised in that：The reactor product cooler and product
There is visor between receiving tank.
8. the continous way double tower distillating method of the continous way double tower distilling apparatus in usage right requirement 1 to 7, including following step
Suddenly：It is characterized in that：
A, material is imported into tower reactor by continuous feed groove by charging aperture, the heating medium in heat supply chuck is heated
Make material evaporation；
B, the valve closed between foreshot cooler and foreshot receiving tank are not closed, and the material in tower reactor is due to being heated
Issue additional into foreshot tower so as to be contacted with the material of charging aperture so that being evaporated before lower boiling in the material flowed into from charging aperture
Part evaporation flows into foreshot exit and constitutes circulation into foreshot tower is interior by first circulation introducing port；What charging aperture was flowed into
Product and high boiling rear fraction in material in addition to lower boiling foreshot enter in tower reactor；
C, the valve closed between reactor product cooler and product receiving tank；Material in tower reactor is due to additional issue into product tower of being heated
Interior, material imported into second circulation introducing port and constitutes circulation from products export, reactor product cooler；In addition, material from products export,
Reactor product cooler imported into the 3rd circulation introducing port；
Visor between d, observation foreshot cooler and foreshot receiving tank, if visor observation foreshot is qualified, closes
Valve between foreshot cooler and second circulation introducing port, opens the valve between foreshot cooler and foreshot receiving tank
Door is so as to realize the lasting discharging of foreshot；Visor between observation reactor product cooler and product receiving tank, if visor is observed
Product is qualified, then the valve closed between reactor product cooler and second circulation introducing port and the 3rd circulation introducing port, opens product
Valve between cooler and product receiving tank is so as to realize the lasting discharging of product；
E, high boiling rear fraction stay in the discharge of tower reactor bottom.
9. according to the continous way double tower distillating method of the continous way double tower distilling apparatus described in claim 8, it is characterised in that：Institute
State material imported into tower reactor by charging aperture by continuous feed groove must keep in tower reactor be inert gas shielding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710009401.7A CN106823434A (en) | 2017-01-06 | 2017-01-06 | Continous way double tower distilling apparatus and distillating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710009401.7A CN106823434A (en) | 2017-01-06 | 2017-01-06 | Continous way double tower distilling apparatus and distillating method |
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| Publication Number | Publication Date |
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| CN106823434A true CN106823434A (en) | 2017-06-13 |
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ID=59118372
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710009401.7A Pending CN106823434A (en) | 2017-01-06 | 2017-01-06 | Continous way double tower distilling apparatus and distillating method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102188831A (en) * | 2010-03-03 | 2011-09-21 | 中国石油化工股份有限公司 | Reactive distillation method |
| CN105194895A (en) * | 2015-09-01 | 2015-12-30 | 中国石油大学(华东) | Thermal coupling partition wall reactive distillation column for preparing biodiesel and method for producing biodiesel |
| CN105339062A (en) * | 2013-02-21 | 2016-02-17 | Gtc科技美国有限责任公司 | Separation processes using divided columns |
| CN105555379A (en) * | 2013-07-18 | 2016-05-04 | Lg化学株式会社 | Dividing wall-type distillation column |
| CN105777704A (en) * | 2016-04-01 | 2016-07-20 | 衢州信步化工科技有限公司 | Double-tower continuous rectifying process of heliotropin |
-
2017
- 2017-01-06 CN CN201710009401.7A patent/CN106823434A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102188831A (en) * | 2010-03-03 | 2011-09-21 | 中国石油化工股份有限公司 | Reactive distillation method |
| CN105339062A (en) * | 2013-02-21 | 2016-02-17 | Gtc科技美国有限责任公司 | Separation processes using divided columns |
| CN105555379A (en) * | 2013-07-18 | 2016-05-04 | Lg化学株式会社 | Dividing wall-type distillation column |
| CN105194895A (en) * | 2015-09-01 | 2015-12-30 | 中国石油大学(华东) | Thermal coupling partition wall reactive distillation column for preparing biodiesel and method for producing biodiesel |
| CN105777704A (en) * | 2016-04-01 | 2016-07-20 | 衢州信步化工科技有限公司 | Double-tower continuous rectifying process of heliotropin |
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Application publication date: 20170613 |