CN106621437A - Method for effectively improving separation effect of fourth polymerization tower - Google Patents
Method for effectively improving separation effect of fourth polymerization tower Download PDFInfo
- Publication number
- CN106621437A CN106621437A CN201610918757.8A CN201610918757A CN106621437A CN 106621437 A CN106621437 A CN 106621437A CN 201610918757 A CN201610918757 A CN 201610918757A CN 106621437 A CN106621437 A CN 106621437A
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- Prior art keywords
- polymerization
- tower
- towers
- steam
- polymerized
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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
- B01D3/42—Regulation; Control
-
- 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
- B01D3/42—Regulation; Control
- B01D3/4211—Regulation; Control of columns
- B01D3/4294—Feed stream
Abstract
The invention provides a method for effectively improving the separation effect of a fourth polymerization tower and belongs to the technical field of polyvinyl alcohol production. Distillate of a third polymerization tower is fed from under a first-layer tower plate, that is, zero-layer plate, of the fourth polymerization plate, and a rectifying section of the fourth polymerization tower is increased; the control manner that the opening of a steam control valve is controlled by the temperature of a sensitive plate in a DCS is avoided, a fixed flow meter is adopted, and the valve opening of the steam control valve in the DCS is controlled by the flow of the flow meter with the flow value of 3.5 t/h. With the adoption of the method, the condition that a large quantity of VAC is evaporated to the tower top along with light components due to the fact that the temperature of the sensitive plate of the fourth polymerization tower fluctuates substantially because of steam flow fluctuation and the temperature of each tower section cannot be controlled stably can be effectively avoided, the VAC content in distillate of the fourth polymerization tower can be stably controlled to be 3.0% (wt%) or below, and the steam consumption of the fourth polymerization tower is 3.5t/h, so that the separation effect of the fourth polymerization tower is guaranteed.
Description
Technical field
The invention belongs to polyvinyl alcohol production technical field, more particularly to a kind of rectifying column control of polyvinyl alcohol production process
Technology processed.
Background technology
In existing polyvinyl alcohol production process, three tower distillates of polymerization feed from polymerization four towers, 24 layers of column plate, by kettle
Outflow control tower liquid level, controls the middle temperature of four towers, by methyl acetate by steam flow（MeOAC）, acetaldehyde（Ald）, acetone etc.
Light component is from vinyl acetate（VAC）Middle separation；Wherein MeOAC, Ald, acetone etc. are distillated from tower top, and VAC is returned from four tower tower reactors
To three towers that are polymerized.But in actual production, because the four tower column plate forms that are polymerized, charging Board position, control mode etc. have differences.Mesh
In front polyvinyl alcohol production technology, four towers of polymerization are 45 layers of sieve-plate tower, and three tower distillates of polymerization add from polymerization four towers, 24 layers of column plate
Material, by kettle outflow four tower liquid levels are controlled, and by reboiler steam flow the middle temperature of four towers is controlled.In actual production, because poly-
Close four tower column plate forms, charging Board position, control mode etc. to have differences, the separating effect of four towers that are polymerized is unsatisfactory, tower top
VAC contents in distillate are 3%～20%（wt%）, remote VAC content≤3.0% beyond target（wt%）, causing VAC to consume increases, and gathers
Close the light components such as methyl acetate, acetaldehyde in operation distillation system to gather, production stability and product quality are impacted.Together
When also result in polymerization four tower steam consumptions reach 3.6～5.8t/h, even more high.
The content of the invention
The purpose of the present invention produces the weak point for existing for existing polyvinyl alcohol, there is provided one kind improves four towers of polymerization
The method of separating effect, effectively takes off the light components such as MeOAC, Ald, the acetone in polymerization distillation system from four column overheads of polymerization
Remove, improve the stability of polymerization distillation system, while reduce polymerization process VAC consuming.
The technical scheme for realizing the object of the invention is such：A kind of method for effectively improving four tower separating effects of polymerization,
The three tower distillates that are polymerized no longer feed from polymerization four towers, 24 layers of tray location, and are changed to from below polymerization four towers, 1 layer of column plate i.e.
" 0 laminate " position feeds, and increases the rectifying section of four towers of polymerization；In addition in control mode, sensitive plate is no longer passed through in dcs
Temperature adopts the flow value of firm discharge meter for 3.5t/h controlling steam control valve aperture, the valve of steam control valve in DCS
Aperture is controlled by the flow of flowmeter.
The method can be prevented effectively from because steam flow fluctuation causes the sensitive plate temperature fluctuation of four towers that is polymerized, each section of temperature of tower
Degree cannot stability contorting cause a large amount of VAC to be steamed situation to tower top with light component, be stably controlled four towers of polymerization and distillate middle VAC
Content≤3.0%（wt%）, four tower steam consumptions of polymerization are 3.5 t/h, so as to ensure that four towers of polymerization（1）Separating effect.
The method is characterized by：The four tower feed locations that are polymerized are i.e. " 0 laminate " charging below 1 layer of column plate；The control of tower
It is 3.5 t/h that mode processed is fixed steam flow（Or other values, steam flow set point can with tower operating load difference change
Become）, steam control valve aperture is controlled according to steam-flow meter flow value in DCS system；Four column overheads that are polymerized distillate VAC contents≤
3.0%（wt%）；Tower reactor MeOAC content≤2.0%（wt%）.
The present invention has the advantages that：
（1）Four towers of polymerization can be distillated middle vinyl acetate VAC contents and be ensured≤3.0% by this method（wt%）, reduce polymerization process
Vinyl acetate consumption；
（2）This method can effectively reduce light component content in polymerization process distillation system, methyl acetate in four tower liquid from reactor of polymerization
MeOAC content≤2.0%（wt%）, solve polymerization process rectification working process light component accumulation polymerisation is impacted ask
Topic；
（3）This method can reduce by the four tower steam consumptions that are polymerized, and stable steam consumption is in 3.5 t/h or so.
Description of the drawings
Fig. 1 is each apparatus control flow schematic diagram of the present invention four towers of polymerization.
As shown in Figure 1：1- four towers of polymerization, 2- three tower distillates of polymerization, 3- polymerization four towers, 24 layers of column plates, 4- four tower towers of polymerization
Top distillates, and 5- distillates condenser, and 6- distillates groove, and 7- distillates pump, and 8- polymerization five towers chargings, 9- flows back, 10- four tower bottoms of polymerization,
11- four tower steam of polymerization, 12- reboilers, 13- flowmeters, 14- steam control valves, the sensitive plate temperatures of 15-, 16- four towers 1 of polymerization
Layer column plate.
Specific embodiment
The specific embodiment of the present invention is elucidated referring to the attached drawing.
As shown in Figure 1：A kind of method for effectively improving four tower separating effects of polymerization, takes the tower distillate of auto polymerization three（2）No
Again from four towers that are polymerized（1）24 layers of tray location（3）Place's charging, and be changed to from polymerization four towers, 1 layer of column plate（16）Lower position, i.e., " 0
Laminate " place position feeds, and increased four towers of polymerization（1）Rectifying section.Tower top is distillated（4）For light component MeOAC, Ald, acetone
Deng through distillating condenser（5）, distillate groove（6）, distillate pump（7）Afterwards, polymerization five towers charging is partly sent（8）, partly as backflow
（9）Deliver to four towers of polymerization.Heavy constituent VAC is used as four tower bottoms（10）Return three towers of polymerization to process.
To being polymerized in Distributed Control System DCS of four tower remotely controls, no longer by sensitive plate temperature（15）To control to steam
Steam control valve（14）Aperture, and adopt firm discharge meter（13）Flow value be 3.5t/h, steam control valve in DCS（14）Valve
Aperture passes through flowmeter（13）Flow controlling.Ensure that four column overheads of polymerization are distillated（4）Middle VAC content≤3.0%（wt%）,
Be polymerized four tower bottoms（10）Middle MeOAC content≤2.0%（wt%）, while ensure that four tower steam of polymerization（11）Consumption 3.5
T/h or so, effectively increases four tower separating effects of polymerization, reduces four tower steam consumptions of polymerization.
The method can be prevented effectively from because of steam（11）Flowed fluctuation causes the sensitive plate temperature of four towers that is polymerized（15）Fluctuation,
Each section of temperature of tower cannot stability contorting cause a large amount of VAC to be steamed situation to tower top with light component, be stably controlled four towers of polymerization
Tower top is distillated（4）Middle VAC content≤3.0%（wt%）, be polymerized four tower steam（11）Consumption is 3.5 t/h, poly- so as to ensure that
Close four towers（1）Separating effect.
The method is characterized by：The four tower feed locations that are polymerized are in 1 layer of column plate（16）Lower section is " 0 laminate " charging；Tower
Control mode be fixed steam flow be 3.5 t/h（Or other values, steam flow set point can be with tower operating load difference
Change）, steam control valve in DCS system（14）Aperture is according to steam-flow meter（13）Flow value is controlled；Four column overheads that are polymerized evaporate
Go out VAC content≤3.0%（wt%）；Tower reactor MeOAC content≤2.0%（wt%）.
Claims (4)
1. it is a kind of effectively improve polymerization four tower separating effects method, it is characterised in that take the tower distillate of auto polymerization three（2）No longer
From four towers that are polymerized（1）24 layers of tray location（3）Place's charging, and be changed to from polymerization four towers, 1 layer of column plate（16）Lower position, i.e., " 0 layer
Plate " place position feeds, and increased four towers of polymerization（1）Rectifying section；Four column overheads that are polymerized are distillated（4）For light component MeOAC,
Ald, acetone etc., through distillating condenser（5）, distillate groove（6）, distillate pump（7）Afterwards, polymerization five towers charging is partly sent（8）, part
As backflow（9）Deliver to four towers of polymerization；Heavy constituent VAC is used as four tower bottoms that are polymerized（10）Return three towers of polymerization to be processed.
2. according to claim 1 it is a kind of effectively improve polymerization four tower separating effects method, it is characterised in that to polymerization
In Distributed Control System DCS of four tower remotely controls, no longer by sensitive plate temperature（15）To control steam control valve（14）Open
Degree, and adopt firm discharge meter（13）Flow value to steam control valve（14）Valve opening, and by flowmeter（13）Stream
Measure to control.
3. it is according to claim 2 it is a kind of effectively improve polymerization four tower separating effects method, it is characterised in that it is described
Flowmeter（13）Flow value be 3.5t/h.
4. it is according to claim 1 or claim 2 it is a kind of effectively improve polymerization four tower separating effects method, it is characterised in that pass through
Firm discharge meter（13）Flow value to steam control valve（14）Valve opening and flow control, it is ensured that polymerization four column overheads evaporate
Go out（4）Middle VAC content≤3.0%（wt%）, be polymerized four tower bottoms（10）Middle MeOAC content≤2.0%（wt%）, while ensure that poly-
Close four tower steam（11）Consumption in 3.5 t/h or so, effectively increase polymerization four tower separating effects, reduce polymerization four towers steam
Vapour consumption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610918757.8A CN106621437A (en) | 2016-10-21 | 2016-10-21 | Method for effectively improving separation effect of fourth polymerization tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610918757.8A CN106621437A (en) | 2016-10-21 | 2016-10-21 | Method for effectively improving separation effect of fourth polymerization tower |
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| Publication Number | Publication Date |
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| CN106621437A true CN106621437A (en) | 2017-05-10 |
Family
ID=58855734
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610918757.8A Pending CN106621437A (en) | 2016-10-21 | 2016-10-21 | Method for effectively improving separation effect of fourth polymerization tower |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1750867A (en) * | 2003-02-21 | 2006-03-22 | 株式会社物产纳米技术研究所 | Method for concentrating water-soluble organic material |
| CN102030639A (en) * | 2010-11-17 | 2011-04-27 | 江门天诚溶剂制品有限公司 | New energy-saving production process of ethyl acetate |
| CN103373919A (en) * | 2013-07-04 | 2013-10-30 | 天津大学 | Method and equipment for separating and recycling alcoholysis waste liquid in polyvinyl alcohol production |
| CN204779422U (en) * | 2015-06-30 | 2015-11-18 | 内蒙古双欣环保材料股份有限公司 | Crotonaldehyde rectifier unit |
| CN105964008A (en) * | 2016-07-14 | 2016-09-28 | 中国石化长城能源化工（宁夏）有限公司 | High-purity vinyl acetate separating system |
| CN106084099A (en) * | 2016-08-17 | 2016-11-09 | 中国石化长城能源化工（宁夏）有限公司 | A kind of effective system reducing polymerization energy consumption of rectification and improving operational stability |
-
2016
- 2016-10-21 CN CN201610918757.8A patent/CN106621437A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1750867A (en) * | 2003-02-21 | 2006-03-22 | 株式会社物产纳米技术研究所 | Method for concentrating water-soluble organic material |
| CN102030639A (en) * | 2010-11-17 | 2011-04-27 | 江门天诚溶剂制品有限公司 | New energy-saving production process of ethyl acetate |
| CN103373919A (en) * | 2013-07-04 | 2013-10-30 | 天津大学 | Method and equipment for separating and recycling alcoholysis waste liquid in polyvinyl alcohol production |
| CN204779422U (en) * | 2015-06-30 | 2015-11-18 | 内蒙古双欣环保材料股份有限公司 | Crotonaldehyde rectifier unit |
| CN105964008A (en) * | 2016-07-14 | 2016-09-28 | 中国石化长城能源化工（宁夏）有限公司 | High-purity vinyl acetate separating system |
| CN106084099A (en) * | 2016-08-17 | 2016-11-09 | 中国石化长城能源化工（宁夏）有限公司 | A kind of effective system reducing polymerization energy consumption of rectification and improving operational stability |
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Application publication date: 20170510 |