CN107080966A - A kind of rectifying tower with bulkhead and bulkhead rectificating method - Google Patents
A kind of rectifying tower with bulkhead and bulkhead rectificating method Download PDFInfo
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- CN107080966A CN107080966A CN201710317259.2A CN201710317259A CN107080966A CN 107080966 A CN107080966 A CN 107080966A CN 201710317259 A CN201710317259 A CN 201710317259A CN 107080966 A CN107080966 A CN 107080966A
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- tower
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- column
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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
- B01D3/146—Multiple effect distillation
Abstract
The invention discloses a kind of rectifying tower with bulkhead, it includes：At least one first rectifying column and at least one Second distillation column；Condenser and connected top discharge mouthful, the condenser and top discharge mouthful are connected with the tower top of the first rectifying column；Reboiler and connected lower discharge port, the reboiler and lower discharge port are connected with the bottom of towe of the Second distillation column；Vapor delivery line and liquid phase pipeline, it connects the first rectifying column and Second distillation column；At least one partition wall, it is located at the first rectifying column and/or the inside of Second distillation column, to form prefractionation section, side line section, stripping section and rectifying section；Charging aperture and side line discharge, it is corresponded to respectively connects with prefractionation section and side line section.The rectifying tower with bulkhead can be transformed based on traditional rectifying column and obtained, and transform difficulty and cost is low, and the transformation time is short, is conducive to the engineering of rectifying tower with bulkhead to promote and implement.Correspondingly the invention also discloses a kind of bulkhead rectificating method.
Description
Technical field
The present invention relates to chemical industry rectifying field, more particularly to a kind of rectifying tower with bulkhead and rectificating method.
Background technology
The unit operation that multicomponent rectification separation is that chemical enterprise is the most key, is most widely used, is also chemical enterprise
The maximum unit operation of energy consumption in production process.
Fig. 1 illustrates traditional rectifying tower structure using conventional two tower positive sequence separating technologies.In traditional distillation process,
For the mixed material containing light component A, intermediate species B and heavy constituent C, if desired obtain being expected the production of purity by rectifying
Product, generally using conventional two tower positive sequence separating technologies, as shown in Figure 1, it is necessary to two rectifying columns, respectively rectifying column T1 and rectifying
Tower T2.Rectifying column T1 tower top distillates light component A, intermediate species B and heavy constituent C and flows into rectifying column from rectifying column T1 tower reactor
T2, separates intermediate species B and heavy constituent C in rectifying column T2.This separation process can be from rectifying column T1 tower tops, rectifying column T2 towers
Top and tower reactor obtain the product of expected purity.Although product can reach the requirement of purity, the energy consumption needed for separation is very high.
Energy consumption can be greatly reduced by the reinforcement technique of distillation process.The rectifying being widely used in industrial production is strong
Change technology has following several：Hot coupling rectifying, heat pump distillation and multi-effect distillation etc..Hot coupling distillation technology is usually to be used in separating multicomponent
Mixture, can be classified as the hot coupling distillation technology in part and complete hot coupling distillation technology in the way of coupling.Bulkhead rectifying
Tower as complete hot coupling distillation technology a kind of single tower body applied, partition wall is generally carried using an inside, using point
Next door separates feed side and side take-off side, it is to avoid the air-teturning mixed phenomenon of intermediate species, can significantly save.
Fig. 2 illustrates a kind of structure of existing rectifying tower with bulkhead.Energy can be greatly reduced using rectifying tower with bulkhead mode
Consumption.As shown in Fig. 2 the mixed material containing light component A, intermediate species B and heavy constituent C is introduced into secondary tower T3, light component A and again
Component C is distillated from secondary tower (frozen-free device and reboiler) T3 tower tops and tower reactor respectively, and intermediate species B has in T3 tower tops, tower reactor.
T3 tower tops, kettle material are directed respectively into king-tower (having condenser and reboiler) T4 correct position, A and B is separated at the top of T4,
B and C is separated in T4 bottoms.T4 tower tops distillate light component A, T4 tower reactor and distillate heavy constituent C, and intermediate species B is adopted by side line in the middle part of T4
Go out.Because T3 overhead reflux liquid is provided by T4 upper aqueous phase side line, the heating of T3 tower reactors is provided by T4 bottoms gas phase side line, only
There is T4 to have condenser and reboiler, therefore reduce operation energy consumption and equipment investment.
Overthrow original device, the substantial amounts of capital input of rectifying tower with bulkhead needs reconstructed, in of short duration production maintenance mistake
The time window changed and debugged in journey is too short, and the engineering for being unfavorable for rectifying tower with bulkhead is promoted and implemented.Therefore it is how sharp
Original tower equipment is used, is transform as the technological process of rectifying tower with bulkhead to the engineering construction of rectifying tower with bulkhead and promoted the use of
Become more and more important.
The content of the invention
An object of the present invention is to provide a kind of rectifying tower with bulkhead, and it can be transformed based on traditional rectifying column and obtained,
And transform difficulty and cost is low, the transformation time is short, the investment of rectifying tower with bulkhead engineer applied is high and transformation difficulty is big so as to overcome
Shortcoming, be conducive to rectifying tower with bulkhead engineering promote and implement.
According to foregoing invention purpose, the present invention proposes a kind of rectifying tower with bulkhead, and it includes：
At least one first rectifying column and at least one Second distillation column, the first rectifying column and Second distillation column are wrapped
Include and be provided with filler and/or column plate inside tower top, bottom of towe and tower body, the rectifying column；
Condenser and connected top discharge mouthful, condenser and the top discharge mouth and the tower top of the first rectifying column
Connection；
Reboiler and connected lower discharge port, the bottom of towe of the reboiler and lower discharge port and the Second distillation column
Connection；
Vapor delivery line and liquid phase pipeline, it connects the first rectifying column and Second distillation column；
At least one partition wall, it is located at the first rectifying column and/or the inside of Second distillation column, to form prefractionation
Section, side line section, stripping section and rectifying section；
Charging aperture and side line discharge, it is corresponded to respectively connects with prefractionation section and side line section.
Rectifying tower with bulkhead of the present invention includes at least two essences connected by the vapor delivery line with liquid phase pipeline
Evaporate tower, including at least one described first rectifying column and at least one Second distillation column.Vapor delivery line and the liquid phase pipeline will
At least one described first rectifying column is connected with the inner space of at least one Second distillation column, then in the first rectifying column
And/or the inside of Second distillation column sets at least one partition wall, to form prefractionation section, side line section, stripping section and rectifying
Section, so as to be equivalent to the rectifying tower with bulkhead of an entirety.
The distillation process of rectifying tower with bulkhead of the present invention can include：Light component A, intermediate species B will at least be contained
And heavy constituent C mixture material is from the throat-fed；Realize light component A and heavy constituent C's in prefractionation section
Separation；In side line section reduction light component A and heavy constituent C concentration, intermediate species B concentration is improved, and from the side line
Discharging opening produces the intermediate species B；Further purified in the stripping section, reduction intermediate species B concentration improves heavy constituent
C concentration, and produce the heavy constituent C from the lower discharge port；Further purified in the rectifying section, reduction intermediate species B
Concentration, improve light component A concentration, and from the top discharge mouthful extraction light component A.
Using the structure of rectifying tower with bulkhead of the present invention as transformation target, it can be transformed and obtained based on existing rectifying column
Rectifying tower with bulkhead of the present invention.For example can be by a vapor delivery line and a liquid phase pipeline connection using conventional two towers
A tower in two towers in traditional rectifying column of positive sequence separating technology, two tower as rectifying tower with bulkhead rectifying section, in addition one
Tower is by increasing the prefractionation section, side line section and stripping section of partition wall formation rectifying tower with bulkhead, you can realize that two towers are transformed into
The engineer applied of rectifying tower with bulkhead, and due to need to only increase partition wall in a tower, transformation difficulty and cost are low, transform the time
It is short, so as to overcome the investment of rectifying tower with bulkhead engineer applied high and the big shortcoming of transformation difficulty, be conducive to the engineering of rectifying tower with bulkhead
Promote and implement.
Preferably, in rectifying tower with bulkhead of the present invention, the partition wall is located at the inside of the Second distillation column, with
The prefractionation section, side line section, stripping section positioned at the inside of the Second distillation column are formed, and positioned at the first rectifying column
Internal rectifying section.
In such scheme, selection only increases partition wall in a tower, so as to advantageously reduce transformation difficulty and cost, shortens
The transformation time.
Preferably, in above-mentioned rectifying tower with bulkhead, the tower diameter of the Second distillation column is more than the tower diameter of the first rectifying column.
In such scheme, selection increases partition wall in the larger tower of tower diameter, transformation difficulty can be reduced, while rationally
Distribute effect of mass transmitting space.
Further, in above-mentioned rectifying tower with bulkhead, the upper end of the partition wall and the tower top of the Second distillation column connect
Connect, the lower end of the partition wall and the bottom of towe of the Second distillation column disconnect.
In such scheme, stripping section is formed between the bottom of towe of the lower end of the partition wall and the Second distillation column, it is described
The both sides of partition wall form prefractionation section and side line section respectively.
Further, in above-mentioned rectifying tower with bulkhead, one end of vapor delivery line and the liquid phase pipeline and the described first essence
The bottom of towe connection of tower is evaporated, the other end is connected with the tower top of the Second distillation column.
In such scheme, by the vapor delivery line and liquid phase pipeline by prefractionation section and side line section and the rectifying
Section connection.
Further, in rectifying tower with bulkhead of the present invention, the liquid phase pipeline is provided with pump.
In such scheme, the pump is used to convey liquid in the liquid phase pipeline.
Further, in rectifying tower with bulkhead of the present invention, the liquid phase pipeline is provided with a point liquor ratio device.
In such scheme, described point of liquor ratio device, which is used to adjust, enters partition wall both sides liquid phase flow.
It is a further object of the present invention to provide a kind of bulkhead rectificating method, it can transform real based on traditional rectifying column
Apply, and transform difficulty and cost is low, the transformation time is short, so as to overcome bulkhead rectifying application investment high and transformation difficulty lacking greatly
Point, is conducive to the popularization and implementation of bulkhead rectifying.
According to foregoing invention purpose, the present invention proposes a kind of bulkhead rectificating method, and it passes through described in any of the above-described scheme
Rectifying tower with bulkhead implement, including step：
By the mixture material at least containing light component A, intermediate species B and heavy constituent C from the throat-fed；
Light component A and heavy constituent C separation are realized in prefractionation section；In side line section reduction light component A and again
Component C concentration, improves intermediate species B concentration, and produce the intermediate species B from the side line discharge；Carried described
Evaporate section further to purify, reduction intermediate species B concentration, improve heavy constituent C concentration, and it is described from lower discharge port extraction
Heavy constituent C；Further purified in the rectifying section, reduction intermediate species B concentration, improve light component A concentration, and from described
The top discharge mouthful extraction light component A.
Bulkhead rectificating method of the present invention by the rectifying tower with bulkhead described in any of the above-described scheme due to being implemented, therefore
It can be transformed and implemented based on traditional rectifying column, and transform difficulty and cost is low, the transformation time is short, so as to overcome bulkhead rectifying
Using the shortcoming that investment is high and transformation difficulty is big, be conducive to the popularization and implementation of bulkhead rectifying.
Rectifying tower with bulkhead of the present invention is compared with traditional rectifying tower with bulkhead, including advantages below and beneficial effect：
(1) it can be transformed and obtained based on traditional rectifying column, and transform difficulty and cost is low, the transformation time is short, so that
Overcome the investment of rectifying tower with bulkhead engineer applied high and the big shortcoming of transformation difficulty, be conducive to the engineering of rectifying tower with bulkhead to promote and real
Apply.
(2) there is few, the easy to implement and obvious energy-saving effect of improvement expenses compared with traditional rectificating method, application prospect is wide
It is wealthy.
(3) progress appropriate reconstruction is only needed just to realize the work(of rectifying tower with bulkhead on original traditional double columns rectification process
Can, transformed by being separated wall to one of rectifying column, increase gas phase connecting pipe and liquid phase connecting pipe, increasing between two towers
Plus the method for pump and point liquor ratio device significantly reduces engineering construction expense and the cycle of rectifying tower with bulkhead.
(4) separation of three components is not limited to, all four components, five components and more multicomponent mixture is can be widely applied to
Rectifying separation process.
(5) degree of power conservation is relevant with the intermediate species back mixing degree in raw material, between back mixing degree and feed composition, component
Relative volatility, the design parameter of rectifying column etc. are relevant, and intermediate species back mixing degree is bigger, and energy-saving effect is more obvious, with aobvious
The practicality and engineering of work are worth, and are had a extensive future.
Bulkhead rectificating method of the present invention equally includes excellent above due to being implemented by above-mentioned rectifying tower with bulkhead
Point and beneficial effect.
Brief description of the drawings
Fig. 1 is traditional rectifying tower structure schematic diagram using conventional two tower positive sequence separating technologies.
Fig. 2 is a kind of existing structural representation of rectifying tower with bulkhead.
Fig. 3 is a kind of structural representation of the rectifying tower with bulkhead of the present invention under embodiment.
Fig. 4 is a kind of BTX of the bulkhead rectificating method of the present invention under embodiment concentration distribution schematic diagram.
Embodiment
Below in conjunction with Figure of description and specific embodiment to rectifying tower with bulkhead of the present invention and bulkhead rectifying
Method is described in further detail.
Fig. 3 illustrates a kind of structure of the rectifying tower with bulkhead of the present invention under embodiment.
As shown in figure 3, the rectifying tower with bulkhead under the embodiment includes：One first rectifying column 1 and second rectifying
Tower 2；Condenser 3 and connected top discharge mouthful 31；Reboiler 4 and connected lower discharge port 41；Vapor delivery line 5 and liquid
Phase pipeline 6；One partition wall 9；Wherein：
First rectifying column 1 includes tower top 11, bottom of towe 12 and tower body 13, and inside is provided with filler；Second distillation column 2 includes tower
Top 21, bottom of towe 22 and tower body 23, inside are provided with filler.The tower diameter of Second distillation column 2 is more than the tower diameter of first rectifying column 1.
Condenser 3 and top discharge mouthful 31 are connected with the tower top 11 of first rectifying column 1.
Reboiler 4 and lower discharge port 41 are connected with the bottom of towe 22 of Second distillation column 2.
Vapor delivery line 5 and the connection first rectifying column 1 of liquid phase pipeline 6 and Second distillation column 2.Vapor delivery line 5 and liquid phase pipeline 6
One end be connected with the bottom of towe 12 of first rectifying column 1, the other end is connected with the tower top 21 of Second distillation column 2.Set on liquid phase pipeline 6
There are pump and point liquor ratio device (not shown).
Partition wall 9 is located at the inside of Second distillation column 2, to form prefractionation section I, side line section II, stripping section III and essence
Evaporate section IV.The upper end of partition wall 9 is connected with the tower top 21 of Second distillation column 2, the lower end of partition wall 9 and the tower of Second distillation column 2
Bottom 22 disconnects.
Charging aperture 7 and side line discharge 8, it is corresponded to respectively connects with prefractionation section I and side line section II.
In rectifying tower with bulkhead under the embodiment, rectifying section IV is located at the inside of first rectifying column 1, and its main function is
Further purification, reduction intermediate species B concentration, improves light component A concentration；Stripping section III is located at the lower section of partition wall 9, its
Main function is further purification, and reduction intermediate species B concentration improves heavy constituent C concentration；Prefractionation section I, which is located at, to be separated
The side of the close charging aperture 7 of wall 9, its main function is the separation for realizing light component A and heavy constituent C；Side line section II, which is located at, divides
The side of the close side line discharge 8 in next door 9, its main function is to reduce light component A and heavy constituent C concentration, improves middle
Component B concentration.
When rectifying tower with bulkhead under the embodiment works, to separate ternary mixture A/B/C (αA＞ αB＞ αC) be
Example, mixture A/B/C feeds from charging aperture 7, in prefractionation I flash separation of section into gas phase and liquid phase；The portion of the bottom of stripping section III
Point liquid phase becomes gas phase by the heating of reboiler 4, and the gas phase evaporated enters according to a certain percentage from the top of stripping section III upwards
The lower end of prefractionation section I and side line section II；The gas phase of side line section II enters rectifying from II upper end of side line section through vapor delivery line 5 upwards
The lower end of section IV；After the gas phase that the gas phase of prefractionation section I is obtained upwards, with feeding flash distillation is converged, from I upper end of prefractionation section through gas
Phase pipeline 5 enters the lower end of rectifying section IV；The gas phase of the lower end of rectifying section IV passes upward through condenser 3 and is condensed into liquid phase, one
Divide from top discharge mouthful 31 liquid phases discharging, another part is back to the top of rectifying section IV；The liquid phase at the top of rectifying section IV declines downwards
To the lower end of rectifying section IV, the upper end of prefractionation section I and side line section II is flowed into through liquid phase pipeline 6 according to a certain percentage；Side line section II
The liquid phase of upper end drops to downwards the upper end that II lower end of side line section flows into stripping section III；The liquid phase of I upper end of prefractionation section is downward, with
The liquid phase that charging flash distillation is obtained drops to the upper end that I lower end of prefractionation section flows into stripping section III after converging；The upper end of stripping section III
Liquid phase drop to the bottom of stripping section III downwards, a part passes through reboiler 4 from the discharging of the liquid phase of lower discharge port 41, another part
Heating becomes to return to the bottom of stripping section III after gas phase.In addition, the gas phase of the approaching side line segment II of stripping section III is entered with rectifying section IV
The liquid phase for entering side line section II equally exists contact and mass exchange, concentrate intermediate species, and in side line discharge 8 in side line section II
Produce the intermediate species product of certain flow.
Illustrate the transformation work using the rectifying tower with bulkhead of above-mentioned embodiment as transformation target below by specific embodiment
Journey.
The present embodiment using Fig. 1 traditional rectifying tower structure for using conventional two tower positive sequence separating technologies are basic as transformation, with
The rectifying tower with bulkhead of above-mentioned embodiment is transformed for transformation target.With reference to Fig. 3 is referred to, specific adaptation step includes：
Step 110：From the rectifying column T2 conducts that tower diameter in traditional rectifying column of conventional two tower positive sequence separating technologies is larger
Second distillation column 2, tower T1 is used as first rectifying column 1.
Step 120：Partition wall 9 is installed in the internal upper part of Second distillation column 2.
Step 130：Remove the reboiler of the bottom of towe 12 of first rectifying column 1 and the condenser of the tower top of Second distillation column 2.
Step 140：The condenser 3 and the bottom of towe of Second distillation column 2 of the tower top 11 of first rectifying column 1 are changed by energy consumption calculation
22 reboiler 4, or increase the two heat exchange area.
Step 150：Tower top 21 increases the vapor delivery line 5 being connected with first rectifying column 1 and liquid phase pipeline 6.Vapor delivery line 5
It is connected simultaneously with prefractionation I side of section and II side of side line section of the tower top 21 of Second distillation column 2 with liquid phase pipeline 6.Vapor delivery line 5 will
The both sides gas phase of 2 tower top of Second distillation column 21 is collected and converges into the feeding bottom of towe 12 of first rectifying column 1 after one gas phase；Liquid phase pipeline 6
It will be extracted out by pump from the bottom of towe 12 of first rectifying column 1, the liquid phase for being divided into two strands through undue liquor ratio device is respectively fed to partition wall 9
Both sides column plate or filler.
Step 160：Increase a charging aperture 7 and a side line discharge 8 respectively in prefractionation section I and side line section II, enter
Material mouth 7 is used for the charging of multicomponent mixed material, and side line discharge 8 is used to produce intermediate species B.
Bulkhead rectificating method under one embodiment of the present invention, it passes through the rectifying tower with bulkhead under above-mentioned embodiment
Implement, including step：
Mixture material BTX containing light component benzene, intermediate species toluene and heavy constituent dimethylbenzene is entered from charging aperture 7
Material；The separation of light component benzene and heavy constituent dimethylbenzene is realized in prefractionation section I；Light component benzene and heavy constituent are reduced in side line section II
The concentration of dimethylbenzene, improves the concentration of intermediate species toluene, and produce intermediate species toluene from side line discharge 8；In stripping section
III further purification, reduces the concentration of intermediate species toluene, improves the concentration of heavy constituent dimethylbenzene, and produced from lower discharge port 41
Heavy constituent dimethylbenzene；Further purified in rectifying section IV, reduce the concentration of intermediate species toluene, improve the concentration of light component benzene,
And produce light component benzene from top discharge mouthful 31.
The implementation result of the bulkhead rectificating method under above-mentioned embodiment is observed below by specific embodiment.
Using industrial BTX mixture materials as separation mixture, it constitutes as shown in table 1.
The industry BTX of table 1 mixture materials are constituted
| Title | Composition, wt% | Title | Composition, wt% |
| Benzene | 12.683 | Water | 0.01 |
| Toluene | 44.185 | Ethylo benzene | 8.162 |
| Ortho-xylene | 5.947 | 1- methyl -3- ethylo benzenes | 0.038 |
| Meta-xylene | 23.443 | Isopropylbenzene | 0.104 |
| Paraxylene | 5.409 | N -nonane | 0.018 |
| Pentane | 0.001 | It is total | 100 |
| Temperature | 358.15K | Flow | 8500kg/h |
| Pressure | 0.9MPa |
Note：BTX raw materials in table 1 are the raw material of industry, and BTX is main matter, while some industrial impurity compositions are also included,
Light component such as water, pentane, will industrially be removed by devices such as tower top compensators；Heavy constituent such as ethylo benzene, 1- methyl -3- second
Base benzene, isopropylbenzene, n -nonane then mix interior with bottom of towe dimethylbenzene (X), and to obtain pure dimethylbenzene also needs subsequent technique removal of impurities.
Grasped by the bulkhead rectificating method and the current widely used conventional two-tower rectification method such as Fig. 1 of the present invention
Make energy consumption comparison, contrast operation's condition and energy-saving effect are as shown in table 2.
The basic operation parameter of table 2
Traditional positive sequence separates rectificating method total load Qr=2.457MW as shown in Table 2, and bulkhead rectificating method of the present invention is always born
Lotus Qr=1.661MW, the reboiler heat duty for the more traditional two-tower rectification method of bulkhead rectificating method that the present invention is provided can be saved
0.796MW, total energy consumption reduction about 32.4%.
The bulkhead rectificating method of above-described embodiment can obtain purity 99.95wt% benzaldehyde product (B), purity 99.97wt%
Toluene product (T) and purity 99.99wt% dimethylbenzene (including ortho-xylene, meta-xylene, paraxylene) and residue
Heavy constituent mixture (X), need to be continued to separate the xylene product needed for obtaining as subsequent unit operation.
Fig. 4 illustrates a kind of BTX of the bulkhead rectificating method of the present invention under embodiment concentration distribution.
As shown in figure 4, in rectifying section IV, from the bottom to top, benzene concentration XM,BIt is in rising trend, toluene concentration XM,TBecome in declining
Gesture, and xylene concentration XM,XIt is very low, it can almost ignore.Side line section II, from top to bottom, benzene concentration XM,BSuccessively decrease and tend to 0, first
Benzene concentration XM,TSlightly rise gradually reduces after keeping higher concentration value, and xylene concentration XM,XGradually increase.Stripping section III, by
Under up to, benzene concentration XM,BEssentially 0；Toluene concentration XM,TSuccessively decrease, bottom of towe is essentially 0；Xylene concentration XM,XIt is incremented by, bottom of towe becomes
It is bordering on 1.As can be seen here, rectifying tower with bulkhead rectifying section IV, side line section II and stripping section III realize the concentrate to the components of BTX tri-,
The components of BTX tri- are all without obvious air-teturning mixed phenomenon in king-tower, and liquid phase composition distribution is good.
As shown in figure 4, raw material is introduced in tower from prefractionation the 19th block of plate of section.From feed entrance point upwards, benzene concentration XP,BSteadily
Increase, toluene concentration XP,TSignificantly increase, xylene concentration XP,XIt is substantially reduced, at the top of prefractionation section I, xylene concentration is basic
Tend to 0；From feed entrance point downwards, benzene concentration is gradually reduced, and toluene concentration gradually increases, and xylene concentration gradually increases, pre-
The bottom of distillation stage I, benzene concentration tends to 0 substantially.Can be seen that prefractionation section I from above-mentioned situation of change realizes benzene and two substantially
The pre-separation of toluene, toluene is after prefractionation section I is entered also without obvious back-mixing situation.Specifically, on the top of prefractionation section I
Portion, benzene concentration be somewhat below after several blocks of column plates, reason is that rectifying section IV number of plates is excessive, causes rectifying section IV most
Toluene concentration on latter block of plate is more high than the toluene concentration on first block of plate of prefractionation section I, the mixing of both liquid phases
Cause benzene concentration in prefractionation section I to reduce on the contrary, form back-mixing.So, in actually transformation, it may be considered that according to circumstances fit
When the reduction number of plates of rectifying section IV.
The rectifying tower with bulkhead and bulkhead rectificating method that the present invention is provided have highly significant economic benefit.Association area
Personnel can carry out suitably changing or changing with combining according to the present invention completely, applied to all three components, four components and multigroup
Divide the rectifying separation process of mixture.It should be strongly noted that all these by carrying out similar change to the present invention
Or change with reconfiguring, it is apparent to those skilled in the art, it is regarded as in spirit of the invention, model
Enclose with content.
It should be noted that listed above is only specific embodiment of the invention, it is clear that implement the invention is not restricted to more than
Example, the similar change for having many therewith.If those skilled in the art directly exports or joined from present disclosure
All deformations expected, all should belong to protection scope of the present invention.
Claims (8)
1. a kind of rectifying tower with bulkhead, it is characterised in that the rectifying tower with bulkhead includes：
At least one first rectifying column and at least one Second distillation column, the first rectifying column and Second distillation column include tower
Filler and/or column plate are provided with inside top, bottom of towe and tower body, the rectifying column；
Condenser and connected top discharge mouthful, condenser and the top discharge mouth and the tower top of the first rectifying column connect
Connect；
Reboiler and connected lower discharge port, the bottom of towe of the reboiler and lower discharge port and the Second distillation column connect
Connect；
Vapor delivery line and liquid phase pipeline, it connects the first rectifying column and Second distillation column；
At least one partition wall, its located at the inside of the first rectifying column and/or Second distillation column, with formed prefractionation section,
Side line section, stripping section and rectifying section；
Charging aperture and side line discharge, it is corresponded to respectively connects with prefractionation section and side line section.
2. rectifying tower with bulkhead as claimed in claim 1, it is characterised in that the partition wall is interior located at the Second distillation column
Portion, to form prefractionation section, side line section, stripping section positioned at the inside of the Second distillation column, and positioned at the described first essence
Evaporate the rectifying section of the inside of tower.
3. rectifying tower with bulkhead as claimed in claim 2, it is characterised in that the tower diameter of the Second distillation column is more than described first
The tower diameter of rectifying column.
4. rectifying tower with bulkhead as claimed in claim 2, it is characterised in that the upper end of the partition wall and the Second distillation column
Tower top connection, the bottom of towe of the lower end of the partition wall and the Second distillation column disconnects.
5. rectifying tower with bulkhead as claimed in claim 3, it is characterised in that one end of vapor delivery line and the liquid phase pipeline and institute
The bottom of towe connection of first rectifying column is stated, the other end is connected with the tower top of the Second distillation column.
6. the rectifying tower with bulkhead as described in any one claim in claim 1-4, it is characterised in that the liquid phase pipeline
It is provided with pump.
7. the rectifying tower with bulkhead as described in any one claim in claim 1-4, it is characterised in that the liquid phase pipeline
Provided with a point liquor ratio device.
8. a kind of rectificating method, it is characterised in that the rectificating method passes through any one claim in such as claim 1-7
Described rectifying tower with bulkhead is implemented, including step：
By the mixture material at least containing light component, intermediate species and heavy constituent from the throat-fed；
The separation of light component and heavy constituent is realized in prefractionation section；The side line section reduction light component and heavy constituent it is dense
Degree, improves the concentration of intermediate species, and produce the intermediate species from the side line discharge；Further carried in the stripping section
It is pure, the concentration of intermediate species is reduced, the concentration of heavy constituent is improved, and the heavy constituent is produced from the lower discharge port；Described
Rectifying section is further purified, and reduces the concentration of intermediate species, improves the concentration of light component, and described from the top discharge mouthful extraction
Light component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710317259.2A CN107080966A (en) | 2017-05-04 | 2017-05-04 | A kind of rectifying tower with bulkhead and bulkhead rectificating method |
Applications Claiming Priority (1)
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