CN107812393A - A kind of methanol three-effect rectification system and technique - Google Patents
A kind of methanol three-effect rectification system and technique Download PDFInfo
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- CN107812393A CN107812393A CN201711022448.3A CN201711022448A CN107812393A CN 107812393 A CN107812393 A CN 107812393A CN 201711022448 A CN201711022448 A CN 201711022448A CN 107812393 A CN107812393 A CN 107812393A
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims description 36
- 230000000694 effects Effects 0.000 claims abstract description 408
- 230000008878 coupling Effects 0.000 claims abstract description 66
- 238000010168 coupling process Methods 0.000 claims abstract description 66
- 238000005859 coupling reaction Methods 0.000 claims abstract description 66
- 239000007791 liquid phase Substances 0.000 claims abstract description 24
- 239000012071 phase Substances 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims description 49
- 238000009833 condensation Methods 0.000 claims description 39
- 230000005494 condensation Effects 0.000 claims description 39
- 239000007788 liquid Substances 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 18
- 238000012546 transfer Methods 0.000 claims description 17
- 238000009834 vaporization Methods 0.000 claims description 16
- 230000008016 vaporization Effects 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 235000019628 coolness Nutrition 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 3
- 230000002411 adverse Effects 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 238000004821 distillation Methods 0.000 abstract description 11
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 238000010992 reflux Methods 0.000 description 6
- 238000005457 optimization Methods 0.000 description 5
- 238000009835 boiling Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical class ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- FBBDOOHMGLLEGJ-UHFFFAOYSA-N methane;hydrochloride Chemical compound C.Cl FBBDOOHMGLLEGJ-UHFFFAOYSA-N 0.000 description 1
- OJURWUUOVGOHJZ-UHFFFAOYSA-N methyl 2-[(2-acetyloxyphenyl)methyl-[2-[(2-acetyloxyphenyl)methyl-(2-methoxy-2-oxoethyl)amino]ethyl]amino]acetate Chemical compound C=1C=CC=C(OC(C)=O)C=1CN(CC(=O)OC)CCN(CC(=O)OC)CC1=CC=CC=C1OC(C)=O OJURWUUOVGOHJZ-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B01D3/322—Reboiler specifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
- C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention relates to a kind of methanol three-effect rectification system,Including the effect rectifying column being sequentially communicated,Two effect rectifying columns and three-effect rectification tower,One effect rectifying tower bottom, which is provided with, needs the one of external heat to imitate reboiler,Two effect rectifying columns and three-effect rectification tower bottom of towe are respectively provided with the coupling reboiler that thermal source is provided by upper one effect rectifying column tower top steam,Two effect coupling reboiler liquid phase parts are back to an effect rectifying column tower top,Gas phase portion enters the effect overhead condenser being connected with two effect coupling reboilers,Triple effect coupling reboiler liquid phase part is back to two effect rectifying column tower tops,Gas phase portion enters two effect overhead condensers being connected with triple effect coupling reboiler,The two effects coupling reboiler, which is back on the pipeline of an effect rectifying column, is communicated with an effect return tank,The triple effect coupling reboiler, which is back on the pipeline of two effect rectifying columns, is communicated with two effect return tanks,The present invention is compared with conventional distillation,Three-effect rectification saving energy 57% of the present invention.
Description
Technical field
The present invention relates to a kind of methanol three-effect rectification system and technique, belongs to chemical materials rectification and purification field.
Background technology
Methanol is widely used, is the Organic Chemicals and high-grade fuel on basis.It is mainly used in fine chemistry industry, plastics etc.
Field, for manufacturing a variety of organic products such as formaldehyde, acetic acid, chloromethanes, first ammonia, sulphur dimethyl ester, and agricultural chemicals, medicine is important
One of raw material.Methanol can be used as a kind of Novel clean-fuel after deep processing, also add gasoline and mix burning.Since 2004, I
The rapid growth impetus is presented in state's methanol Apparent con- sumption, pulls the principal element of China's methanol consumption rapid growth to be on the one hand
The traditional fields such as formaldehyde, acetic acid, methane chloride maintain stable development, are on the other hand alcohol-ether fuels, substitute petrochemical industry original
The emerging fields such as material are quickly grown.
Rectifying is the mixed liquor that will be made up of the different component of volatility, the simultaneously multiple carry out part in rectifying column
Vaporization and partial condensation, separate it into the process of almost pure state component.
Material becomes steam after reboiler heats and risen in rectifying column in rectifying tower reactor, the phegma on every layer of column plate
Body contacts with each other with upflowing vapor, carries out the transmittance process of heat and matter.Due to temperature difference and concentration difference, gas phase be present on column plate
Partial condensation will be carried out, which part difficulty volatile component is transferred in liquid phase；And the latent heat that vapor condensation discharges is transmitted to liquid
Phase, vaporize liquid phase part, which part volatile components are transferred in gas phase.The long and causes the liquid phase for leaving this layer of column plate
It is low when the concentration of middle volatile components is compared with the entrance plate, and the height that volatile components concentration relatively enters in the gas phase left.
If gas-liquid two-phase onboard time of contact long enough, then the gas-liquid two-phase for leaving the plate is mutually balance.Every laminate of rectifying column
On all carry out above-mentioned similar process.
In chemical industry, distillation process is one of maximum unit operation of energy expenditure, since there occurs global energy
Since source problem, the power saving of distillation process has caused the attention of people extensively.The energy-conservation of distillation process substantially can be with
Set about from following several respects：(1) distillation process heat energy makes full use of；(2) distillation process is reduced in itself to the needs of energy；
(3) thermodynamic efficiency of distillation system is improved；(4) qualified piece-rate system is used.
Methanol rectification is industrial at present to use economic benefits and social benefits technique more, such as three tower economic benefits and social benefits, four tower economic benefits and social benefits, than single column saving energy
40%.Some research papers and document are mentioned, if using triple effect technique, can save 17% or so again than economic benefits and social benefits technique, quadruple effect
Technique saves 8% or so again than triple effect, it is taken as that considering, methanol rectification is most economical using triple effect technique.
The content of the invention
The present invention is in view of the deficienciess of the prior art, provide a kind of methanol three-effect rectification system.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of methanol three-effect rectification system, including connect successively
A logical effect rectifying column, two effect rectifying columns and three-effect rectification tower, the effect rectifying tower bottom, which is provided with, needs the one of external heat
Reboiler is imitated, the two effect rectifying column and three-effect rectification tower bottom of towe are respectively provided with provides thermal source by upper one effect rectifying column tower top steam
Coupling reboiler, respectively two effect coupling reboilers and triple effect coupling reboiler, it is described two effect coupling reboiler liquid phase part
An effect rectifying column tower top is back to, gas phase portion enters the effect overhead condenser being connected with two effect coupling reboilers, described
Triple effect coupling reboiler liquid phase part is back to two effect rectifying column tower tops, and gas phase portion enters to be connected with triple effect coupling reboiler
Two logical effect overhead condensers, the two effects coupling reboiler, which is back on the pipeline of an effect rectifying column, is communicated with effect backflow
Tank, the triple effect coupling reboiler, which is back on the pipeline of two effect rectifying columns, is communicated with two effect return tanks, the three-effect rectification tower
Tower top is connected with triple effect overhead condenser, and the triple effect overhead condenser liquid phase part with triple effect overhead condenser by being connected
Triple effect return tank is connected with the three-effect rectification tower, the effect overhead condenser, two effect overhead condensers, triple effect overhead condensation
Trap, respectively one effect trap, two effect traps, triple effect trap are respectively connected with device.
As the further optimization of the present invention, it is provided between the two effects coupling reboiler and the effect overhead condenser
Feedstock secondary heat exchanger, the feedstock secondary heat exchanger gas phase portion are connected with described one effect overhead condenser,
Liquid phase part is connected with described one effect return tank.
As the further optimization of the present invention, it is provided between the triple effect coupling reboiler and the two effects overhead condenser
Feedstock first-class heat exchanger, the feedstock first-class heat exchanger gas phase portion are connected with described two effect overhead condensers,
Liquid phase part is connected with described two effect return tanks.
As the further optimization of the present invention, feedstock three-level heat exchanger, saturation are communicated with the effect reboiler
For vapor after an effect reboiler heat exchange cooling, steam condensate (SC) provides thermal source to feedstock three-level heat exchanger again, described
Feedstock first-class heat exchanger is connected with the feedstock secondary heat exchanger, feedstock three-level heat exchanger successively.
As the further optimization of the present invention, the methanol three-effect rectification system uses following current, the effect rectifying tower
Kettle with described two effect rectifying towers/tower reactor is connected, the two effect tower bottom of rectifying tower with the three-effect rectification tower tower/tower reactor
It is connected, the feedstock three-level heat exchanger is connected with positioned at described one effect rectifying column material inlet, and raw material passes through successively
After crossing feedstock first-class heat exchanger, feedstock secondary heat exchanger, the heat exchange heating of feedstock three-level heat exchanger, from an effect essence
Evaporate Ta Tazhong/tower reactor charging.
As the further optimization of the present invention, the three-effect rectification tower tower reactor imitates in rectifying towers/tower reactor phase with described two
Connection, the two effect tower bottom of rectifying tower imitated in rectifying tower with described one/and tower reactor is connected, the feedstock three-level heat exchanger
It is connected with positioned at the three-effect rectification tower material inlet, raw material is successively by feedstock first-class heat exchanger, feedstock
After secondary heat exchanger, the heat exchange heating of feedstock three-level heat exchanger, from three-effect rectification tower tower/tower reactor charging.
Present invention also offers two kinds of methanol three-effect rectification technique once, and the first uses co-current process, the process
It is as follows：
(1) raw material changes by feedstock first-class heat exchanger, feedstock secondary heat exchanger and feedstock three-level successively
After hot device heat exchange heating, an effect rectifying column is entered；
(2) after raw material enters an effect rectifying column, the heating of the reboiler by providing thermal source with external source, steam rises to
One effect rectifying column tower top, for overhead vapours after two effect coupling reboiler heat exchange coolings, the liquid of condensation enters an effect return tank,
Uncooled gas enters feedstock secondary heat exchanger, and after heat exchange cooling, the liquid of condensation is back to an effect return tank, still
Uncooled steam further condenses by an effect overhead condenser, an effect tower top trap, and condensed fluid produces as finished product,
A finished product part in one effect return tank is back to an effect rectifying column tower top as backflow, realizes the Mass and heat transfer of tower top, another
Part produces as finished product；The kettle of one effect rectifying column is residual to be delivered to two effect rectifying towers by an effect tower bottom of rectifying tower delivery pump
In/tower reactor, the raw material as two effect rectifying columns；
(3) raw material is entered in two effect rectifying columns, is coupled again by two effects using an effect rectifying column tower top steam as thermal source
After boiling device heating vaporization, steam rises to two effect rectifying column tower tops, and overhead vapours is cold after triple effect coupling reboiler heat exchange cooling
Solidifying liquid enters two effect return tanks, and uncooled gas enters feedstock first-class heat exchanger, after heat exchange cooling, condensation
Liquid be back to two effect return tanks, still uncooled steam is further by two effect overhead condensers, two effect tower top traps
Condensation, condensed fluid are back to two effect return tanks, and the two finished product parts imitated in return tanks are back to two effect rectifying as backflow
Column overhead, realizes the Mass and heat transfer of tower top, and another part produces as finished product；The kettle of two effect rectifying columns is residual to pass through two effect rectifying columns
Tower reactor delivery pump is delivered in three-effect rectification tower tower/tower reactor, the raw material as three-effect rectification tower；
(4) raw material is entered in three-effect rectification tower, is coupled again by the triple effect using two effect rectifying column tower top steam as thermal source
After boiling device heating vaporization, vapor portion rises to tower top, is condensed by triple effect condenser, triple effect trap, the liquid of condensation
Body enters triple effect return tank, and uncooled gas enters vacuum system, and the finished product in triple effect return tank a, part is used as back
Stream is back to three-effect rectification column overhead, tower top is realized Mass and heat transfer, and another part produces as finished product, the kettle of three-effect rectification tower
It is residual to be produced by triple effect tower reactor delivery pump to outside battery limit (BL).
Second of technique is adverse current rectification process, and the process is as follows：
(1) raw material changes by feedstock first-class heat exchanger, feedstock secondary heat exchanger and feedstock three-level successively
After hot device heat exchange, three-effect rectification tower is entered；
(2) after raw material enters three-effect rectification tower, coupled again by the triple effect using two effect rectifying column tower top steam as thermal source
The heating vaporization of device is boiled, steam rises to three-effect rectification column overhead, condensed by triple effect condenser, triple effect trap, cold
Solidifying liquid enters triple effect return tank, and uncooled gas enters vacuum system, the finished product in triple effect return tank, a part
Three-effect rectification column overhead is back to as backflow, tower top is realized Mass and heat transfer, another part produces as finished product, three-effect rectification
The raw material of tower is produced into two effect rectifying columns by triple effect tower reactor delivery pump；
(3) raw material is entered in two effect rectifying columns, is coupled again by two effects using an effect rectifying column tower top steam as thermal source
After boiling device heating vaporization, steam rises to two effect rectifying column tower tops, and overhead vapours is cold after triple effect coupling reboiler heat exchange cooling
Solidifying liquid enters two effect return tanks, and uncooled gas enters feedstock first-class heat exchanger, after heat exchange cooling, condensation
Liquid be back to two effect return tanks, still uncooled steam is further by two effect overhead condensers, two effect tower top traps
Condensation, condensed fluid are back to two effect return tanks, and the two finished product parts imitated in return tanks are back to two effect rectifying as backflow
Column overhead, realizes the Mass and heat transfer of tower top, and another part produces as finished product；The kettle of two effect rectifying columns is residual to pass through two effect rectifying columns
Tower reactor delivery pump is delivered in an effect rectifying tower/tower reactor, the raw material as an effect rectifying column；
(4) raw material is entered in an effect rectifying column, after reboiler heating vaporization is imitated with the one of external heat, steam portion
Divide and rise to tower top, overhead vapours is after two effect coupling reboilers heat exchange coolings, and the liquid of condensation enters an effect return tank, not
The gas of condensation enters feedstock secondary heat exchanger, and after heat exchange cooling, the liquid of condensation is back to an effect return tank, not yet
The steam of condensation further condenses by an effect overhead condenser, an effect tower top trap, and condensed fluid produces as finished product, and one
A finished product part in effect return tank is back to an effect rectifying column tower top as backflow, realizes the Mass and heat transfer of tower top, another portion
It is allocated as producing for finished product；The kettle of one effect rectifying column is residual to be delivered to outside battery limit (BL) by an effect tower bottom of rectifying tower delivery pump.
In above two technique, the feedstock first-class heat exchanger, the feedstock secondary heat exchanger, the raw material
Charging three-level heat exchanger increases according to actual conditions, reduces or cancelled.
In above two technique, the effect rectifying column, two effect rectifying columns, the feeding mouths of three-effect rectification tower be located in tower or
Tower reactor.
The beneficial effects of the invention are as follows：Water can not only be greatly reduced compared with conventional distillation in the three-effect rectification of the present invention
Steam consumption, and the dosage and power consumption of cooling water can also be reduced, improve thermodynamic efficiency so that distillation process heat energy energy
Enough make full use of, reduce distillation process in itself to the needs of energy, compared with conventional distillation, three-effect rectification of the present invention
Saving energy 57%.
Brief description of the drawings
Fig. 1 is co-current process structural representation of the present invention；
Fig. 2 is counter-current process structural representation of the present invention.
Embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in figure 1, the effect rectifying column 4, two that present embodiment one relate to include to be sequentially communicated imitate rectifying column 12 and
Three-effect rectification tower 19, an effect rectifying column 4 bottom of towe, which is provided with, needs the one of external heat to imitate reboiler 5, the two effects rectifying column
12 and the bottom of towe of three-effect rectification tower 19 be respectively provided with the coupling reboiler that thermal source is provided by upper one effect rectifying column 4 overhead vapours, respectively
Reboiler 14 is coupled for two effect coupling reboilers 7 and triple effect, the two effects coupling liquid phase part of reboiler 7 is back to an effect rectifying
The tower top of tower 4, gas phase portion enter the effect overhead condenser 9 being connected with two effect coupling reboilers 7, and the triple effect coupling is boiled again
The liquid phase part of device 14 is back to the tower top of two effect rectifying column 12, and gas phase portion enters two to be connected with triple effect coupling reboiler 14
Overhead condenser 16 is imitated, the two effects coupling reboiler 7, which is back on the pipeline of an effect rectifying column 4, is communicated with an effect return tank 8,
The triple effect coupling reboiler 14, which is back on the pipeline of two effect rectifying columns 12, is communicated with two effect return tanks 15, the three-effect rectification
The tower top of tower 19 is connected with triple effect overhead condenser 21, the liquid phase part of triple effect overhead condenser 21 by with triple effect overhead condensation
The triple effect return tank 23 that device 21 connects is connected with the three-effect rectification tower 19, and the effect overhead condenser 9, two imitates overhead condensation
Trap is respectively connected with device 16, triple effect overhead condenser 21, respectively one effect trap 10, two imitates trap 17, triple effect is caught
Storage 22.
Present embodiment is a kind of, enters between the two effects coupling reboiler 7 and the effect overhead condenser 9 provided with raw material
Expect secondary heat exchanger 2, the gas phase portion of feedstock secondary heat exchanger 2 is connected with described one effect overhead condenser 9, liquid phase
Part is connected with described one effect return tank 8.
In present embodiment one, raw material is provided between the triple effect coupling reboiler 14 and the two effects overhead condenser 16
Three-level heat exchanger 3 is fed, the gas phase portion of feedstock three-level heat exchanger 3 is connected with described two effect overhead condensers 16,
Liquid phase part is connected with described two effect return tanks 15.
In present embodiment one, feedstock three-level heat exchanger 3 is communicated with the effect reboiler 5, saturation water steams
For gas after an effect heat exchange cooling of reboiler 5, steam condensate (SC) provides thermal source, the original to feedstock three-level heat exchanger 3 again
Material charging first-class heat exchanger 1 is connected with the feedstock secondary heat exchanger 2, feedstock three-level heat exchanger 3 successively.
Methanol three-effect rectification system described in present embodiment one uses following current, the effect tower reactor of rectifying column 4 and described two
In the effect tower of rectifying column 12/tower reactor is connected, the two effect tower reactor of rectifying column 12 with the tower of three-effect rectification tower 19/tower reactor is connected
Connect, the feedstock three-level heat exchanger 3 is connected with positioned at the described one effect material inlet of rectifying column 4, and raw material passes through successively
After feedstock first-class heat exchanger 1, feedstock secondary heat exchanger 2, the heat exchange heating of feedstock three-level heat exchanger 3, from an effect
In the tower of rectifying column 4/tower reactor charging.
The co-current process flow of embodiment one is as follows：
(1) raw material passes through feedstock first-class heat exchanger 1, feedstock secondary heat exchanger 2 and feedstock three-level successively
After the heat exchange heating of heat exchanger 3, an effect rectifying column 4 is entered；
(2) after raw material enters an effect rectifying column 4, the heating of the reboiler by providing thermal source with external source, steam rises
To an effect tower top of rectifying column 4, after the two effect coupling heat exchange coolings of reboiler 7, the liquid of condensation enters an effect and returned overhead vapours
Tank 8 is flowed, uncooled gas enters feedstock secondary heat exchanger 2, and after heat exchange cooling, the liquid of condensation is back to an effect and returned
Tank 8 is flowed, still uncooled steam is imitated tower top trap by an effect overhead condenser 9, one and further condensed, condensed fluid conduct
Finished product is produced, and the finished product in an effect return tank 8 is conveyed by an effect overhead reflux pump 11, and a part is back to an effect as backflow
The tower top of rectifying column 4, realizes the Mass and heat transfer of tower top, and another part produces as finished product；The kettle of one effect rectifying column 4 is residual to pass through an effect
Tower bottom of rectifying tower delivery pump 6 is delivered in the tower of two effect rectifying column 12/tower reactor, the raw material as two effect rectifying columns 12；
(3) raw material is entered in two effect rectifying columns 12, is coupled by two effects using an effect overhead vapours of rectifying column 4 as thermal source
After the heating vaporization of reboiler 7, steam rises to the tower top of two effect rectifying column 12, and overhead vapours is through the triple effect coupling heat exchange drop of reboiler 14
Wen Hou, the liquid of condensation enter two effect return tanks 15, and uncooled gas enters feedstock first-class heat exchanger 1, heat exchange
After cooling, the liquid of condensation is back to two effect return tanks 15, and still uncooled steam imitates tower by two effect overhead condensers 16, two
Top trap further condenses, and condensed fluid is back to two effect return tanks 15, and two finished products imitated in return tanks 15 pass through two effect towers
Top reflux pump 18 conveys, and a part is back to the tower top of two effect rectifying column 12 as backflow, realizes the Mass and heat transfer of tower top, another portion
It is allocated as producing for finished product；The kettle of two effect rectifying columns 12 is residual to be delivered to three-effect rectification tower 19 by two effect tower bottom of rectifying tower delivery pumps 13
In tower/and tower reactor, the raw material as three-effect rectification tower 19；
(4) raw material is entered in three-effect rectification tower 19, by the triple effect coupling using the two effect overhead vapours of rectifying column 12 as thermal source
After closing the heating vaporization of reboiler 14, vapor portion rises to tower top, is condensed by triple effect condenser, triple effect trap 22,
The liquid of condensation enters triple effect return tank 23, and uncooled gas enters vacuum system, the finished product in triple effect return tank 23
Conveyed by triple effect overhead reflux pump 24, a part is back to the tower top of three-effect rectification tower 19 as backflow, tower top is realized caloic
Transmit, another part is produced as finished product, and the kettle of three-effect rectification tower 19 is residual to be produced to outside battery limit (BL) by triple effect tower reactor delivery pump 25.
Embodiment two：
As shown in Fig. 2 present embodiment two provides a kind of methanol three-effect rectification system, including the effect essence being sequentially communicated
Evaporate tower 4, two and imitate rectifying column 12 and three-effect rectification tower 19, an effect rectifying column 4 bottom of towe, which is provided with, needs the one of external heat to imitate again
Device 5 is boiled, the two effect rectifying column 12 and the bottom of towe of three-effect rectification tower 19 are respectively provided with provides heat by upper one effect rectifying column 4 overhead vapours
The coupling reboiler in source, respectively two effect coupling reboilers 7 and triple effect coupling reboiler 14, the two effects coupling liquid of reboiler 7
The tower top of an effect rectifying column 4 is mutually partly refluxed to, gas phase portion enters the effect overhead condensation being connected with two effect coupling reboilers 7
Device 9, the triple effect coupling liquid phase part of reboiler 14 are back to the tower top of two effect rectifying column 12, and gas phase portion enters and triple effect coupling
The two effect overhead condensers 16 that reboiler 14 is connected are closed, the two effects coupling reboiler 7 is back to the pipeline of an effect rectifying column 4
On be communicated with an effect return tank 8, the triple effect coupling reboiler 14, which is back on the pipeline of two effect rectifying columns 12, is communicated with two effects
Return tank 15, the tower top of three-effect rectification tower 19 are connected with triple effect overhead condenser 21, the liquid phase of triple effect overhead condenser 21
Part is connected by the triple effect return tank 23 being connected with triple effect overhead condenser 21 with the three-effect rectification tower 19, the effect tower
Trap, respectively one effect trap are respectively connected with the top effect of condenser 9, two overhead condenser 16, triple effect overhead condenser 21
10th, two effect traps 17, triple effect trap 22.
Described in present embodiment two feedstock is provided between two effect coupling reboilers 7 and the effect overhead condenser 9
Secondary heat exchanger 2, the gas phase portion of feedstock secondary heat exchanger 2 are connected with described one effect overhead condenser 9, liquid phase portion
Divide and be connected with described one effect return tank 8.
Enter between triple effect coupling reboiler 14 described in present embodiment two and the two effects overhead condenser 16 provided with raw material
Expect first-class heat exchanger 1, the gas phase portion of feedstock first-class heat exchanger 1 is connected with described two effect overhead condensers 16, liquid
Mutually part is connected with described two effect return tanks 15.
Feedstock three-level heat exchanger 3 is communicated with an effect reboiler 5 described in present embodiment two, saturated steam passes through
After the one effect heat exchange cooling of reboiler 5, steam condensate (SC) provides thermal source, the feedstock to feedstock three-level heat exchanger 3 again
First-class heat exchanger 1 is connected with the feedstock secondary heat exchanger 2, feedstock three-level heat exchanger 3 successively.
Present embodiment two uses counter-current process, the tower reactor of three-effect rectification tower 19 with the described two effect towers of rectifying column 12/
Tower reactor is connected, and the two effect tower reactor of rectifying column 12 imitated in the tower of rectifying column 4 with described one/and tower reactor is connected, the feedstock
Three-level heat exchanger 3 is connected with positioned at the material inlet of three-effect rectification tower 19, and raw material changes by feedstock one-level successively
After hot device 1, feedstock secondary heat exchanger 2, the heat exchange heating of feedstock three-level heat exchanger 3, from the tower of three-effect rectification tower 19/tower
Kettle is fed.
The co-current process flow of embodiment two is as follows：
(1) raw material passes through feedstock first-class heat exchanger 1, feedstock secondary heat exchanger 2 and feedstock three-level successively
After heat exchanger 3 exchanges heat, three-effect rectification tower 19 is entered；
(2) after raw material enters three-effect rectification tower 19, by the triple effect coupling using the two effect overhead vapours of rectifying column 12 as thermal source
The heating vaporization of reboiler 14 is closed, steam rises to the tower top of three-effect rectification tower 19, entered by triple effect condenser, triple effect trap 22
Row condensation, the liquid of condensation enter triple effect return tank 23, and uncooled gas enters vacuum system, in triple effect return tank 23
Finished product conveyed by triple effect overhead reflux pump 24, a part as backflow is back to the tower top of three-effect rectification tower 19, makes tower top reality
Existing Mass and heat transfer, another part as finished product extraction, the raw material of three-effect rectification tower 19 by triple effect tower reactor delivery pump 25 produce to
In two effect rectifying columns 12；
(3) raw material is entered in two effect rectifying columns 12, is coupled by two effects using an effect overhead vapours of rectifying column 4 as thermal source
After the heating vaporization of reboiler 7, steam rises to the tower top of two effect rectifying column 12, and overhead vapours is through the triple effect coupling heat exchange drop of reboiler 14
Wen Hou, the liquid of condensation enter two effect return tanks 15, and uncooled gas enters feedstock first-class heat exchanger 1, heat exchange
After cooling, the liquid of condensation is back to two effect return tanks 15, and still uncooled steam imitates tower by two effect overhead condensers 16, two
Top trap further condenses, and condensed fluid is back to two effect return tanks 15, and two finished products imitated in return tanks 15 pass through two effect towers
Top reflux pump 18 conveys, and a part is back to the tower top of two effect rectifying column 12 as backflow, realizes the Mass and heat transfer of tower top, another portion
It is allocated as producing for finished product；The kettle of two effect rectifying columns 12 is residual to be delivered to an effect rectifying column 4 by two effect tower bottom of rectifying tower delivery pumps 13
In tower/and tower reactor, the raw material as an effect rectifying column 4；
(4) raw material is entered in an effect rectifying column 4, after the heating vaporization of reboiler 5 is imitated with the one of external heat, steam
Part rises to tower top, and for overhead vapours after the two effect coupling heat exchange coolings of reboiler 7, the liquid of condensation enters an effect return tank
8, uncooled gas enters feedstock secondary heat exchanger 2, and after heat exchange cooling, the liquid of condensation is back to an effect return tank
8, still uncooled steam is imitated tower top trap by an effect overhead condenser 9, one and further condensed, and condensed fluid is as finished product
Extraction, a finished product imitated in return tank 8 are conveyed by an effect overhead reflux pump 11, and a part is back to an effect rectifying as backflow
The tower top of tower 4, realizes the Mass and heat transfer of tower top, and another part produces as finished product；The kettle of one effect rectifying column 4 is residual to pass through an effect rectifying
Tower tower reactor delivery pump 6 is delivered to outside battery limit (BL).
Need what is further illustrated, three-effect rectification tower needs to set three-effect rectification tower tower reactor circulating pump 20, ensures triple effect essence
Evaporate the heat demand of tower.
Comprising above two embodiment, extend in all embodiments, the feedstock first-class heat exchanger 1, institute
State feedstock secondary heat exchanger 2, the feedstock three-level heat exchanger 3 increases according to actual conditions, reduces or cancelled.It is described
One effect rectifying column 4, two imitates rectifying column 12, the feeding mouth of three-effect rectification tower 19 is located in tower or tower reactor.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (10)
1. a kind of methanol three-effect rectification system, including an effect rectifying column, two effect rectifying columns and the three-effect rectification tower being sequentially communicated, its
It is characterised by：The one effect rectifying tower bottom, which is provided with, needs the one of external heat to imitate reboiler, the two effect rectifying columns and triple effect
Rectifying tower bottom is respectively provided with the coupling reboiler that thermal source is provided by upper one effect rectifying column tower top steam, and respectively two effect couplings are again
Device and triple effect coupling reboiler are boiled, the two effects coupling reboiler liquid phase part is back to an effect rectifying column tower top, gas phase portion
Into the effect overhead condenser being connected with two effect coupling reboilers, the triple effect coupling reboiler liquid phase part is back to two
Rectifying column tower top is imitated, gas phase portion enters two effect overhead condensers being connected with triple effect coupling reboiler, the two effects coupling
Conjunction reboiler, which is back on the pipeline of an effect rectifying column, is communicated with an effect return tank, and the triple effect coupling reboiler is back to two effects
It is communicated with two effect return tanks on the pipeline of rectifying column, the three-effect rectification column overhead is connected with triple effect overhead condenser, and described three
Effect overhead condenser liquid phase part is connected by the triple effect return tank being connected with triple effect overhead condenser with the three-effect rectification tower,
The one effect overhead condenser, two effect overhead condensers, trap is respectively connected with triple effect overhead condenser, respectively one effect is caught
Storage, two effect traps, triple effect trap.
A kind of 2. methanol three-effect rectification system according to claim 1, it is characterised in that：It is described two effect coupling reboiler with
Be provided with feedstock secondary heat exchanger between the one effect overhead condenser, the feedstock secondary heat exchanger gas phase portion and
The one effect overhead condenser is connected, and liquid phase part is connected with described one effect return tank.
A kind of 3. methanol three-effect rectification system according to claim 1 or 2, it is characterised in that：The triple effect coupling is boiled again
Feedstock first-class heat exchanger, the feedstock first-class heat exchanger gas phase portion are provided between device and the two effects overhead condenser
Divide and be connected with described two effect overhead condensers, liquid phase part is connected with described two effect return tanks.
A kind of 4. methanol three-effect rectification system according to claim 3, it is characterised in that：Connected on the one effect reboiler
There is feedstock three-level heat exchanger, after an effect reboiler heat exchange cooling, steam condensate (SC) enters saturated steam to raw material again
Expect that three-level heat exchanger provides thermal source, the feedstock first-class heat exchanger successively with the feedstock secondary heat exchanger, raw material
Charging three-level heat exchanger is connected.
A kind of 5. methanol three-effect rectification system according to claim 1, it is characterised in that：The methanol three-effect rectification system
Using following current, an effect tower bottom of rectifying tower with described two effect rectifying towers/tower reactor is connected, described two imitate tower bottom of rectifying tower
With in the three-effect rectification tower tower/tower reactor is connected, the feedstock three-level heat exchanger with it is former positioned at described one effect rectifying column
Material charging aperture is connected, and raw material is successively by feedstock first-class heat exchanger, feedstock secondary heat exchanger, feedstock three-level
After heat exchanger heat exchange heating, from an effect rectifying tower/tower reactor charging.
A kind of 6. methanol three-effect rectification system according to claim 1, it is characterised in that：The three-effect rectification tower tower reactor with
In the two effects rectifying tower/tower reactor is connected, the two effect tower bottom of rectifying tower imitated in rectifying tower with described one/and tower reactor is connected
Connect, the feedstock three-level heat exchanger is connected with positioned at the three-effect rectification tower material inlet, and raw material is successively by original
After material charging first-class heat exchanger, feedstock secondary heat exchanger, the heat exchange heating of feedstock three-level heat exchanger, from three-effect rectification tower
In tower/tower reactor charging.
7. a kind of methanol three-effect rectification technique, the technique is using the system as described in claim 1-5,7, it is characterised in that：Institute
It is following current rectification process to state rectification process, and the process is as follows：
(1) raw material passes through feedstock first-class heat exchanger, feedstock secondary heat exchanger and feedstock three-level heat exchanger successively
After heat exchange heating, an effect rectifying column is entered；
(2) after raw material enters an effect rectifying column, the heating of the reboiler by providing thermal source with external source, steam rises to an effect
Rectifying column tower top, for overhead vapours after two effect coupling reboiler heat exchange coolings, the liquid of condensation enters an effect return tank, not cold
Solidifying gas enters feedstock secondary heat exchanger, and after heat exchange cooling, the liquid of condensation is back to an effect return tank, cold not yet
Solidifying steam further condenses by an effect overhead condenser, an effect tower top trap, and condensed fluid produces as finished product, an effect
A finished product part in return tank is back to an effect rectifying column tower top as backflow, realizes the Mass and heat transfer of tower top, another part
Produced as finished product；The kettle of one effect rectifying column is residual to be delivered in two effect rectifying towers/tower by an effect tower bottom of rectifying tower delivery pump
Kettle, the raw material as two effect rectifying columns；
(3) raw material is entered in two effect rectifying columns, by the two effect coupling reboilers using an effect rectifying column tower top steam as thermal source
After heating vaporization, steam rises to two effect rectifying column tower tops, and overhead vapours is exchanged heat through triple effect coupling reboiler after cooling, condensation
Liquid enters two effect return tanks, and uncooled gas enters feedstock first-class heat exchanger, after heat exchange cooling, the liquid of condensation
Body is back to two effect return tanks, and still uncooled steam further condenses by two effect overhead condensers, two effect tower top traps,
Condensed fluid is back to two effect return tanks, and the two finished product parts imitated in return tanks are back to two effect rectifying towers as backflow
Top, realizes the Mass and heat transfer of tower top, and another part produces as finished product；The kettle of two effect rectifying columns is residual to pass through two effect tower bottom of rectifying tower
Delivery pump is delivered in three-effect rectification tower tower/tower reactor, the raw material as three-effect rectification tower；
(4) raw material is entered in three-effect rectification tower, and reboiler is coupled by the triple effect using two effect rectifying column tower top steam as thermal source
After heating vaporization, vapor portion rises to tower top, is condensed by triple effect condenser, triple effect trap, the liquid of condensation enters
Enter to triple effect return tank, uncooled gas enters vacuum system, and the finished product in triple effect return tank a, part is returned as backflow
Three-effect rectification column overhead is back to, tower top is realized Mass and heat transfer, another part produces as finished product, and the kettle of three-effect rectification tower is residual logical
Triple effect tower reactor delivery pump is crossed to produce to outside battery limit (BL).
8. a kind of methanol three-effect rectification technique, the technique is using the system as described in claim 1-4,6-7, it is characterised in that：
The rectification process is adverse current rectification process, and the process is as follows：
(1) raw material passes through feedstock first-class heat exchanger, feedstock secondary heat exchanger and feedstock three-level heat exchanger successively
After heat exchange, three-effect rectification tower is entered；
(2) after raw material enters three-effect rectification tower, reboiler is coupled by the triple effect using two effect rectifying column tower top steam as thermal source
Heating vaporization, steam rises to three-effect rectification column overhead, condensed by triple effect condenser, triple effect trap, condensation
Liquid enters triple effect return tank, and uncooled gas enters vacuum system, the finished product in triple effect return tank, a part of conduct
Backflow is back to three-effect rectification column overhead, tower top is realized Mass and heat transfer, and another part produces as finished product, three-effect rectification tower
Raw material is produced into two effect rectifying columns by triple effect tower reactor delivery pump；
(3) raw material is entered in two effect rectifying columns, by the two effect coupling reboilers using an effect rectifying column tower top steam as thermal source
After heating vaporization, steam rises to two effect rectifying column tower tops, and overhead vapours is exchanged heat through triple effect coupling reboiler after cooling, condensation
Liquid enters two effect return tanks, and uncooled gas enters feedstock first-class heat exchanger, after heat exchange cooling, the liquid of condensation
Body is back to two effect return tanks, and still uncooled steam further condenses by two effect overhead condensers, two effect tower top traps,
Condensed fluid is back to two effect return tanks, and the two finished product parts imitated in return tanks are back to two effect rectifying towers as backflow
Top, realizes the Mass and heat transfer of tower top, and another part produces as finished product；The kettle of two effect rectifying columns is residual to pass through two effect tower bottom of rectifying tower
Delivery pump is delivered in an effect rectifying tower/tower reactor, the raw material as an effect rectifying column；
(4) raw material is entered in an effect rectifying column, after reboiler heating vaporization is imitated with the one of external heat, on vapor portion
Tower top is risen to, for overhead vapours after two effect coupling reboiler heat exchange coolings, the liquid of condensation enters an effect return tank, uncooled
Gas enter feedstock secondary heat exchanger, after heat exchange cooling, the liquid of condensation is back to an effect return tank, still uncooled
Steam by one effect overhead condenser, one effect tower top trap further condense, condensed fluid as finished product extraction, one imitates back
A finished product part in stream tank is back to an effect rectifying column tower top as backflow, realizes the Mass and heat transfer of tower top, and another part is made
Produced for finished product；The kettle of one effect rectifying column is residual to be delivered to outside battery limit (BL) by an effect tower bottom of rectifying tower delivery pump.
A kind of 9. methanol three-effect rectification technique according to claim 7 or 8, it is characterised in that：The feedstock one-level
Heat exchanger, the feedstock secondary heat exchanger, the feedstock three-level heat exchanger increase according to actual conditions, reduce or taken
Disappear.
A kind of 10. methanol three-effect rectification technique according to claim 7 or 8, it is characterised in that：The one effect rectifying column,
Two effect rectifying columns, the feeding mouth of three-effect rectification tower is located in tower or tower reactor.
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| CN108276249A (en) * | 2018-04-04 | 2018-07-13 | 烟台国邦化工机械科技有限公司 | A kind of high concentration ethanol double-effect rectification process and system |
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| CN110040802A (en) * | 2019-05-31 | 2019-07-23 | 西南大学 | A kind of rectifier unit that coating material production Sewage treatment utilizes and its application method |
| CN110498731A (en) * | 2019-09-19 | 2019-11-26 | 天津中科拓新科技有限公司 | The method and device of methyl cyclohexane alkoxide coproduction cyclohexanecarboxaldehyde, cyclohexanemethanol and cyclohexanecarboxylic acid |
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