CN109761751A - A kind of methanol thermal coupling multi-effect distillation method and device - Google Patents
A kind of methanol thermal coupling multi-effect distillation method and device Download PDFInfo
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Abstract
The present invention relates to the technical field of rectification in methanol chemistry separation engineering, in particular to a kind of methanol thermal coupling multi-effect distillation method and device.Its apparatus structure includes the pre-rectifying tower and first rectifying column of concatenation, force (forcing) pump is set between the pre-rectifying tower and first rectifying column, first rectifying column rear has been sequentially connected in series Second distillation column, third distillation column and the 4th rectifying column, pre-rectifying tower condenser is provided at the top of the pre-rectifying tower, the pre-rectifying tower bottom is provided with pre-rectifying tower coupling reboiler, the first rectifying column bottom is provided with first rectifying column coupling reboiler, the Second distillation column bottom is provided with Second distillation column coupling reboiler, the third distillation column bottom is provided with third distillation column coupling reboiler, 4th rectifier bottoms are provided with the 4th tower-coupled reboiler of rectifying, the 4th rectifying column condenser is provided at the top of 4th rectifying column；The higher overhead vapours of operating pressure inputs heat to the lower tower of operating pressure by coupling reboiler.A kind of methanol thermal coupling multi-effect distillation method and device of the invention can reduce energy consumption, reduce three waste discharge.
Description
Technical field
The present invention relates to the technical field of rectification in methanol chemistry separation engineering, in particular to a kind of methanol thermal coupling multiple-effect
Rectificating method and device.
Background technique
Methanol is one of most important organic chemistry product and Organic Chemicals in C-1 chemistry.Methanol rectification technology is
The unique method of industrial methanol production, energy consumption accounts for 30% or so of methanol production total energy consumption, advanced, energy-efficient, reliable
Methanol rectification technology it is extremely important for methanol industry.It is very crucial for energy-saving, upgrading emission reduction and cleaning ambient.Most
It is early that methanol is industrially refined using two rectifying column of single-action, obtain refined methanol.Later with methanol rectifying system enlargement, industry
On generally use three rectifying column of economic benefits and social benefits processing methanol, obtain refined methanol.General refined methanol consumption steam per ton is less than < 0.75 ton of
Commercial plant generallys use the common control loop such as tandem, feedback and method to realize methanol fractionation system at present
Control, it is simple inexpensive, however increasingly developed production requirement can not be coped with.The disadvantage is that excessive manual intervention is needed, from
And the fluctuation of system is caused, to make unstable product quality, plant energy consumption is also higher.
" simple analysis methanol rectification technology " (national methanol synthesis technology exchange seminar, 2010) for what is be widely used at present
The characteristics of three rectifying tower technology of economic benefits and social benefits and energy consumption have carried out detailed discussion；" improving methanol rectification process technology " (" acetaldehyde acetic acid
Chemical industry ", 2015 (2): 50-50) also attempt to improve methanol rectification technology；University Of Tianjin's (Chinese patent
200710150233.x, differential pressure low-energy-consumption distillation method and equipment) attempt to main distillation column using heat pump distillation technology, to obtain
Refined methanol product is obtained, but due to the particularity of crude carbinol system property, causes the compression ratio of heat pump too big, does not conform to economically
It calculates, therefore there is no industrial application.
Summary of the invention
In order to solve problems in the prior art, the present invention provides a kind of methanol thermal coupling multi-effect distillation method and device,
It can reduce energy consumption, reduces three waste discharge.
The technical solution adopted in the present invention is as follows:
A kind of methanol thermal coupling multi-effect distillation device, pre-rectifying tower and first rectifying column including concatenation, the pre- essence
It evaporates and force (forcing) pump is set between tower and first rectifying column, first rectifying column rear has been sequentially connected in series Second distillation column, third distillation column
With the 4th rectifying column, the pre-rectifying tower top is provided with pre-rectifying tower condenser, and the pre-rectifying tower bottom is provided with
Pre-rectifying tower couple reboiler, the first rectifying column bottom be provided with first rectifying column coupling reboiler, described second
Rectifier bottoms are provided with Second distillation column coupling reboiler, and the third distillation column bottom is provided with third distillation column coupling
Reboiler, the 4th rectifier bottoms are provided with the 4th tower-coupled reboiler of rectifying, set at the top of the 4th rectifying column
It is equipped with the 4th rectifying column condenser.
4th rectifying column rear is serially connected with the 5th rectifying column.
A kind of methanol thermal coupling multi-effect distillation method, comprising the following steps:
A, the crude carbinol come from pre-rectifying tower is pumped into first rectifying column by pressurization, and smart first is produced at the top of first rectifying column
Alcohol, tower reactor produce alcohol-containing water；
B, the alcohol-containing water of first rectifying column output is sent in the middle part of Second distillation column；Refined methanol is produced at the top of Second distillation column,
Tower reactor produces alcohol-containing water, is sent to third distillation column, and Second distillation column top material heats third distillation column and couples reboiler；
C, refined methanol, tower reactor extracted waste water are produced at the top of third distillation column；Third distillation column material or public work object
Material can couple reboiler heating to pre-rectifying tower.
Method further include step D, increase the 5th rectifying column, using the 4th rectifying column, first rectifying column, Second distillation column,
Third distillation column, pre-rectifying tower five imitate the super thermal coupled process of rectifying.
In a word at various pressures (pressurization, normal pressure, vacuum), the rectifying column of operating pressure high (while temperature is also high)
Overhead vapours to the rectifying column of operating pressure low (while temperature is also low) reboiler heat, formation it is multiple (four times, five times or
Person six times) heat cascade utilization process flow can significant energy-saving and emission-reduction, improve the rate of recovery.
Guarantee multi-effect distillation (quadruple effect, five effects or six effects) pressure step and Temperature Matching, is configured with specially for the present invention
Advanced automatic control technology.The characteristics of it is according to methanol rectification technology itself, by each rectifying tower pressure interior force, temperature, temperature gradient,
In the parameter integrations such as regurgitant volume to a set of automatic control system, according to target product feature, automatically control the temperature of tower, pressure,
Regurgitant volume, produced quantity, to guarantee that producing refined methanol quality stablizes, low alcoholization is also may be implemented in waste discharge.This is automatically controlled
System built-in energy matching module, this energy match module according to parameters such as temperature, pressure and the flows for obtaining each equipment,
The required energy and consumed energy for calculating capital equipment, judge required energy and whether consumed energy matches, as
Match, then maintains current operation operating condition；If it does not match, the adjustable parameter of automatic searching, and then these parameters are adjusted, from
And exactly match the energy consumption of each equipment of system.In this way, then can guarantee that the energy consumption of entire distillation system can reach
To target.
Technical solution provided by the invention has the benefit that
The present invention is by multi-effect distillation (quadruple effect, five effects or six effects), thermal coupled process and matching Dynamic matrix control skill
Art is applied to methanol rectification process, i.e., will on the basis of the sufficiently research each component fundamental property of crude carbinol and interaction
The work of separation of methanol purification process is reasonably divided into multiple steps (four, five and six), then by the energy of each step
Amount Proper Match gradually recycles in turn.
The present invention be by the research of crude carbinol property, distillation technology exploitation and Advanced Control Techniques combine, then by its with
Engineering construction technological incorporation, thus ultimately form low energy consumption, cleaning, low three waste discharge novel technique.In general it transports
Refined methanol consumption steam per ton is produced with this quadruple effect distillation technology construction methanol rectifying system and is less than < 0.75 ton, less than existing dress
Set the 72% of energy consumption；Refined methanol consumption steam per ton, which is produced, with this five effects distillation technology construction methanol rectifying system is less than < 0.6
Ton, less than the 56% of existing apparatus energy consumption.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of formation picture of device of methanol thermal coupling multi-effect distillation method and device of the invention；
Fig. 2 is a kind of method control principle drawing of methanol thermal coupling multi-effect distillation method and device of the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
As shown in Fig. 1, a kind of methanol thermal coupling multi-effect distillation device, including the pre-rectifying tower 1 being sequentially connected in series and first
Force (forcing) pump is arranged between the pre-rectifying tower 1 and first rectifying column 4 in rectifying column 4, which is characterized in that first rectifying
4 rear of tower has been sequentially connected in series Second distillation column 6, third distillation column 8 and the 4th rectifying column 10, sets at the top of the pre-rectifying tower 1
It is equipped with pre-rectifying tower condenser 2,1 bottom of pre-rectifying tower is provided with pre-rectifying tower coupling reboiler 3, first essence
It evaporates 4 bottom of tower and is provided with first rectifying column coupling reboiler 5,6 bottom of Second distillation column is provided with Second distillation column coupling
Reboiler 7 is closed, 8 bottom of third distillation column is provided with third distillation column coupling reboiler 9, the 4th rectifying column 10
Bottom is provided with the tower-coupled reboiler 12 of the 4th rectifying, is provided with the 4th rectifying column condenser at the top of the 4th rectifying column 10
11。
Embodiment two
A kind of methanol thermal coupling multi-effect distillation method of the present embodiment, comprising the following steps:
After crude carbinol initially enters the removing light component of pre-rectifying tower 1, tower reactor aqueous methanol is by being pumped into heat exchanger and discharging
After heat exchange, into high-pressure rectification tower (i.e. first rectifying column 4), high-pressure rectification tower top steam goes to heat subsequent middle pressure rectifying tower-coupled
Reboiler (i.e. Second distillation column couples reboiler 7), while producing part refined methanol；Tower reactor aqueous methanol goes Intermediate Heat Exchanger to change
It is pressed in the middle part of rectifying column (i.e. Second distillation column 6) in entering after recuperation of heat heat.Middle pressure rectifying tower top steam goes to heat subsequent pressurization
The tower-coupled reboiler of rectifying (i.e. third distillation column couples reboiler 9), while producing part refined methanol；During tower reactor aqueous methanol is gone
Between heat exchanger heat exchange recycling heat after enter compression rectification tower (i.e. third distillation column 8) in the middle part of.Compression rectification overhead vapours goes to add
The subsequent tower-coupled reboiler of atmospheric distillation (i.e. the 4th tower-coupled reboiler 12 of rectifying) of heat, while producing part refined methanol；Tower reactor
Aqueous methanol enters in the middle part of atmospheric distillation tower (i.e. the 4th rectifying column) after removing Intermediate Heat Exchanger heat exchange recycling heat.Atmospheric distillation tower
Top steam removes the 4th rectifying column condenser 11, condensed methanol, and part extraction is used as refined methanol product, and part returns to atmospheric tower
Top is as reflux；Tower reactor waste water decontamination water process after heat exchange；The fusel oil such as side take-off ethyl alcohol.
Refined methanol consumption steam per ton is produced with this quadruple effect distillation technology construction device and is less than < 0.75 ton, less than existing
The 72% of plant energy consumption.
Embodiment three
A kind of methanol thermal coupling multi-effect distillation method of the present embodiment, comprising the following steps:
After crude carbinol initially enters pre-rectifying tower removing light component, tower reactor aqueous methanol is changed by being pumped into heat exchanger with discharging
After heat, into high-pressure rectification tower, high-pressure rectification tower top steam removes heating pre-rectifying tower coupling reboiler and medium pressure column reboiler, together
When produce part refined methanol；Tower reactor aqueous methanol is pressed in the middle part of rectifying column in entering after going Intermediate Heat Exchanger heat exchange to recycle heat.In
Pressure rectifying tower top steam goes to heat the tower-coupled reboiler of subsequent compression rectification, while producing part refined methanol；Tower reactor aqueous methanol
Enter in the middle part of compression rectification tower after removing Intermediate Heat Exchanger heat exchange recycling heat.Compression rectification overhead vapours goes to heat subsequent normal pressure essence
Tower-coupled reboiler is evaporated, while producing part refined methanol；Tower reactor aqueous methanol enters after removing Intermediate Heat Exchanger heat exchange recycling heat
In the middle part of atmospheric distillation tower.Atmospheric distillation tower top steam removes condenser, condensed methanol, and part extraction is used as refined methanol product,
Part returns to Atmospheric Tower as reflux；Tower reactor alcohol-containing water is gone in the middle part of methanol distillation column.Methanol Recovery tower top extraction anhydrous first and second
Alcohol；Tower reactor waste water decontamination water process after heat exchange；The fusel oil such as side take-off butanol.
Refined methanol consumption steam per ton, which is produced, with this quadruple effect distillation technology construction methanol rectifying system is less than < 0.72 ton,
Less than the 70% of existing apparatus energy consumption.
Example IV
A kind of methanol thermal coupling multi-effect distillation method of the present embodiment, comprising the following steps:
After crude carbinol initially enters pre-rectifying tower removing light component, tower reactor aqueous methanol is changed by being pumped into heat exchanger with discharging
After heat, into high-pressure rectification tower, high-pressure rectification tower top steam removes heating medium pressure column reboiler, while producing part refined methanol；Tower
Kettle aqueous methanol is pressed in the middle part of rectifying column in entering after going Intermediate Heat Exchanger heat exchange to recycle heat.Middle pressure rectifying tower top steam goes to heat
Pre-rectifying tower couples reboiler and the tower-coupled reboiler of subsequent compression rectification, while producing part refined methanol；Tower reactor aqueous methanol
Enter in the middle part of compression rectification tower after removing Intermediate Heat Exchanger heat exchange recycling heat.Compression rectification overhead vapours goes to heat subsequent normal pressure essence
Tower-coupled reboiler is evaporated, while producing part refined methanol；Tower reactor aqueous methanol enters after removing Intermediate Heat Exchanger heat exchange recycling heat
In the middle part of atmospheric distillation tower.Atmospheric distillation tower top steam removes condenser, condensed methanol, and part extraction is used as refined methanol product,
Part returns to Atmospheric Tower as reflux；Tower reactor waste water decontamination water process, the fusel oil such as side take-off ethyl alcohol.
Refined methanol consumption steam per ton, which is produced, with this quadruple effect distillation technology construction methanol rectifying system is less than < 0.78 ton,
Less than the 75% of existing apparatus energy consumption.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of methanol thermal coupling multi-effect distillation device, pre-rectifying tower and first rectifying column including concatenation, the pre- rectifying
Force (forcing) pump is set between tower and first rectifying column, which is characterized in that the first rectifying column rear has been sequentially connected in series the second essence
Tower, third distillation column and the 4th rectifying column are evaporated, is provided with pre-rectifying tower condenser, the pre- essence at the top of the pre-rectifying tower
It evaporates tower bottom and is provided with pre-rectifying tower coupling reboiler, the first rectifying column bottom is provided with first rectifying column coupling and boils again
Device, the Second distillation column bottom are provided with Second distillation column coupling reboiler, and the third distillation column bottom is provided with
Third distillation column couples reboiler, and the 4th rectifier bottoms are provided with the 4th tower-coupled reboiler of rectifying, and described the
The 4th rectifying column condenser is provided at the top of four rectifying columns；The higher overhead vapours of operating pressure is by coupling reboiler to operation
The lower tower of pressure inputs heat.
2. a kind of methanol thermal coupling multi-effect distillation device according to claim 1, which is characterized in that the 4th rectifying
Tower rear is serially connected with the 5th rectifying column.
3. a kind of methanol thermal coupling multi-effect distillation method, comprising the following steps:
A, the crude carbinol come from pre-rectifying tower is pumped into first rectifying column by pressurization, produces refined methanol at the top of first rectifying column,
Tower reactor produces alcohol-containing water；
B, the alcohol-containing water of first rectifying column output is sent in the middle part of Second distillation column；Refined methanol, tower reactor are produced at the top of Second distillation column
Alcohol-containing water is produced, third distillation column is sent to, Second distillation column top material heats third distillation column and couples reboiler；
C, refined methanol, tower reactor extracted waste water are produced at the top of third distillation column；Third distillation column material or public work material can
To give pre-rectifying tower coupling reboiler heating.
4. a kind of methanol thermal coupling multi-effect distillation method according to claim 3, which is characterized in that the method also includes
Step D, increase by the 5th rectifying column, using the 4th rectifying column, first rectifying column, Second distillation column, third distillation column, pre-rectifying tower
The five effect super thermal coupled process of rectifying.
5. a kind of methanol thermal coupling multi-effect distillation method according to claim 4, which is characterized in that if third tower side line
The fusel oil of extraction is enough, needs to be further processed, then can be tower-coupled with front five by it, is thusly-formed six effects essence
Evaporate thermal coupling.
6. a kind of methanol thermal coupling multi-effect distillation method according to claim 3, which is characterized in that in the method, essence
The pressure for evaporating tower reduces step by step, the high 3- of operating pressure sequence of the high rectifying column of the operating pressure rectifying column lower than operating pressure
15bar。
7. a kind of methanol thermal coupling multi-effect distillation method according to claim 3, which is characterized in that in the method, appoint
The refined methanol of what rectifying column production can be from tower top or side take-off.
8. a kind of methanol thermal coupling multi-effect distillation method according to claim 3, which is characterized in that contain in charging crude carbinol
There are water, acetone, methyl formate, ethyl alcohol, alkane, propyl alcohol, butanol, refined methanol product is produced by the top of tower or return tank, water
The tower reactor extraction of last rectifying column from sequence distillation sequences, the fusels such as ethyl alcohol, propyl alcohol are then from side take-off.
9. a kind of methanol thermal coupling multi-effect distillation method according to claim 3, which is characterized in that come from pre-rectifying tower
Crude carbinol contains light component, then from side take-off refined methanol product.
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Cited By (6)
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| CN110280033A (en) * | 2019-06-04 | 2019-09-27 | 常州大学 | A kind of device and method preparing propyl propionate from recuperation of heat reactive distillation |
| CN110280034A (en) * | 2019-07-02 | 2019-09-27 | 中国天辰工程有限公司 | A kind of methanol fractionation system and technique |
| CN110327647A (en) * | 2019-07-19 | 2019-10-15 | 张兵 | A kind of refining crude methanol process of three tower triple effect of modified |
| CN112961033A (en) * | 2021-02-24 | 2021-06-15 | 河北工业大学 | Five-tower five-effect rectification process method and device for methanol |
| CN113521785A (en) * | 2021-08-18 | 2021-10-22 | 天津大学 | Thermal coupling methanol rectification method of side line and bulkhead recovery tower |
| CN113620783A (en) * | 2021-08-18 | 2021-11-09 | 天津大学 | Reverse-forward mixed five-tower three-effect methanol rectification method using pre-rectifying tower as hot hydrazine |
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| CN110280033A (en) * | 2019-06-04 | 2019-09-27 | 常州大学 | A kind of device and method preparing propyl propionate from recuperation of heat reactive distillation |
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| CN113521785A (en) * | 2021-08-18 | 2021-10-22 | 天津大学 | Thermal coupling methanol rectification method of side line and bulkhead recovery tower |
| CN113620783A (en) * | 2021-08-18 | 2021-11-09 | 天津大学 | Reverse-forward mixed five-tower three-effect methanol rectification method using pre-rectifying tower as hot hydrazine |
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