CN106749802B - A kind of preparation method and preparation system of high polymerization degree narrow ditribution polyvinyl alcohol - Google Patents
A kind of preparation method and preparation system of high polymerization degree narrow ditribution polyvinyl alcohol Download PDFInfo
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- CN106749802B CN106749802B CN201710100257.8A CN201710100257A CN106749802B CN 106749802 B CN106749802 B CN 106749802B CN 201710100257 A CN201710100257 A CN 201710100257A CN 106749802 B CN106749802 B CN 106749802B
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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Abstract
The present invention provides a kind of preparation methods of high polymerization degree narrow ditribution polyvinyl alcohol, comprising: S1) polymerized monomer, initiator are mixed in static mixer with organic solvent, obtain mixed liquor；The polymerized monomer includes vinylacetate；S2) mixed liquor is mixed with desalted water, anaerobic under confined conditions, carry out polymerization reaction, obtain polyvinyl acetate；S3) polyvinyl acetate is saponified, obtains polyvinyl alcohol.Compared with prior art, the present invention first through vinylacetate and initiator in static mixer after mixing, then mix with desalted water and to carry out suspension polymerisation, the polyvinyl alcohol degree of polymerization made is higher and narrowly distributing；And preparation method of the present invention has the advantages that polymerization time is short, speed is fast, synthesis technology is simple and convenient to operate, pipeline is not likely to produce monomer autohemagglutination, suitable for industrialization, the polyvinyl alcohol being prepared can be used for producing the application fields such as polyvinyl alcohol polaroid, high strength and modulus vinal.
Description
Technical field
The invention belongs to polyvinyl alcohol technical field more particularly to a kind of preparation sides of high polymerization degree narrow ditribution polyvinyl alcohol
Method and preparation system.
Background technique
Polyvinyl alcohol (hereinafter referred to as PVA) is a kind of high-molecular compound, is had been widely used in the industry.Many institute's weeks
The PVA polymerization known has polymerisation in solution, bulk polymerization, suspension polymerisation, emulsion polymerization etc., and organic peroxy can be used in polymerization reaction
Class, azo, persulfuric acid salt etc. prepare polyvinyl acetate (hereinafter referred to as PVAc) as initiator, will by saponification
PVAc is converted into PVA.
PVA industrialized production mainly uses solution polymerization process at present, but the obtained PVA degree of polymerization not more than 3000,
The PVA of high polymerization degree cannot be prepared, and high polymerization degree PVA is only the ideal material for preparing film and high-performance fiber.
Japanese Patent Laid-Open No. Sho 61-148209/1986 discloses a kind of side that high polymerization degree PVA is prepared using suspension polymerisation
Method, this method polymerization temperature is at 20 DEG C hereinafter, polymerization time is long more than 48 hours, it is difficult to realize industrialization.
Chinese Journal of Synthetic Chemistry, 14 (3), 253-257,2006 disclose the vinegar of report
Vinyl acetate (hereinafter referred to as VAc) suspension polymerization, is typically employed in VAc and dissolves initiator, and VAc is molten with initiator
Liquid, which is added simultaneously in reactor, carries out suspension polymerisation, and which can be sent out in initiator dissolving tank and delivery pipe in industrialization amplification
Biology material autohemagglutination plugging problem, affects greatly industrialization continuous production.Therefore so far, prepared by PVA for suspension polymerisation
Report be only limitted to laboratory research, be not easy realize industrialization.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is that providing a kind of system of high polymerization degree narrow ditribution polyvinyl alcohol
Preparation Method and preparation system.
The present invention provides a kind of preparation methods of high polymerization degree narrow ditribution polyvinyl alcohol, comprising:
S1 polymerized monomer, initiator are mixed in static mixer with organic solvent), obtain mixed liquor；The polymerization
Monomer includes vinylacetate；
S2) mixed liquor is mixed with desalted water, anaerobic under confined conditions, carry out polymerization reaction, obtain poly-vinegar acid
Vinyl acetate；
S3) polyvinyl acetate is saponified, obtains polyvinyl alcohol.
Preferably, in terms of by polymerized monomer for 100 parts by weight, the desalted water is 100~300 parts by weight, the initiator
For 0.01~0.3 parts by weight, the organic solvent is 0.01~10 parts by weight.
Preferably, the initiator be 50 DEG C of half-life period be 20~900min organic peroxy class initiator and/or 50 DEG C
Half-life period is the azo-initiator of 20~900min.
Preferably, the initiator is selected from bis- (4- tert-butylcyclohexyl) esters of dicetyl peroxydicarbonate, peroxidating neodecanoic acid -2,
One in 4,4- trimethyl pentyl ester, cumyl peroxyneodecanoate, peroxidating cyclohexylsulfonyl acetyl and azobisisoheptonitrile
Kind is a variety of.
Preferably, the organic solvent is selected from the fatty alcohol of low chain tra nsfer, low molecular weight, low chain tra nsfer, low molecular weight
One of the aromatic compound or a variety of of aliphatic hydrocarbon and low chain tra nsfer, low molecular weight；It is preferably selected from methanol, ethyl alcohol, tertiary fourth
One of alcohol, benzene and toluene are a variety of.
Preferably, the temperature of the polymerization reaction is 25 DEG C~50 DEG C；The time of polymerization reaction is 3~6h.
Preferably, the step S1) specifically:
Initiator is mixed with organic solvent, obtains initiator solution；
The initiator solution is mixed in static mixer with polymerized monomer, obtains mixed liquor.
Preferably, the step S2) in desalted water is first heated to 40 DEG C~90 DEG C, then mixed again with mixed liquor.
Preferably, the static mixer is selected from SV type static mixer, SK type static mixer or SX static mixing
Device.
The present invention also provides a kind of preparation systems of high polymerization degree narrow ditribution polyvinyl alcohol, comprising:
Polymerization reaction kettle；The polymerization reaction kettle is provided with desalted water feed opening, second charging aperture and discharge port；
The static mixer being connected with the second charging aperture of the polymerization reaction kettle；The static mixer is provided with poly-
Close monomer addition mouth and initiator feed opening；
The scrubbing tower being connected with the discharge port of the polymerization reaction kettle；
The saponification device being connected with the discharge port of the scrubbing tower.
The present invention provides a kind of preparation methods of high polymerization degree narrow ditribution polyvinyl alcohol, comprising: S1) by polymerized monomer,
Initiator mixes in static mixer with organic solvent, obtains mixed liquor；The polymerized monomer includes vinylacetate；S2)
The mixed liquor is mixed with desalted water, anaerobic under confined conditions, carry out polymerization reaction, obtain polyvinyl acetate；S3) will
The polyvinyl acetate is saponified, and polyvinyl alcohol is obtained.Compared with prior art, the present invention first through vinylacetate with draw
Agent is sent out in static mixer after mixing, then mix with desalted water and to carry out suspension polymerisation, the polyvinyl alcohol made polymerize
Spend higher and narrowly distributing；And preparation method of the invention is with polymerization time is short, speed is fast, synthesis technology is simple, operation side
Just, pipeline is not likely to produce the advantages of monomer autohemagglutination, is suitable for industrialization, and the polyvinyl alcohol being prepared is applicable to production polyethylene
The application fields such as alcohol polaroid, high strength and modulus vinal, have a vast market foreground.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the preparation system of high polymerization degree narrow ditribution polyvinyl alcohol provided by the invention.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
The present invention provides a kind of preparation methods of high polymerization degree narrow ditribution polyvinyl alcohol, comprising: S1) by polymerized monomer,
Initiator mixes in static mixer with organic solvent, obtains mixed liquor；The polymerized monomer includes vinylacetate
(VAc)；S2) mixed liquor is mixed with desalted water, anaerobic under confined conditions, carry out polymerization reaction, obtain poly-vinegar acid second
Enester；S3) polyvinyl acetate is saponified, obtains polyvinyl alcohol.
Wherein, the present invention is not particularly limited the source of all raw materials, is commercially available.The polymerized monomer packet
Vinylacetate is included, may also comprise other can be with one of vinyl acetate copolymerized monomer or a variety of；In the present invention, with
Polymerized monomer is 100 parts by weight meters, and the desalted water is preferably 100~300 parts by weight, more preferably 150~250 parts by weight,
It is further preferably 200 parts by weight；The initiator is preferably 0.01~0.3 parts by weight, more preferably 0.05~0.2 parts by weight, then
Preferably 0.1~0.15 parts by weight, most preferably 0.1 parts by weight；The type of the initiator is known to those skilled in the art
Initiator, have no special limitation, the organic peroxy class that preferably 50 DEG C of half-life period are 20~900min in the present invention
The azo-initiator that initiator and/or 50 DEG C of half-life period are 60~600min, more preferably 50 DEG C of half-life period be 60~
The azo-initiator that the organic peroxy class initiator of 600min and/or 50 DEG C of half-life period are 20~900min；Organic mistake
Oxygen class initiator is preferably bis- (4- tert-butylcyclohexyl) esters of dicetyl peroxydicarbonate, peroxidating neodecanoic acid -2,4,4- trimethyl penta
One of ester, cumyl peroxyneodecanoate and peroxidating cyclohexylsulfonyl acetyl are a variety of；The azo-initiator
Preferably azobisisoheptonitrile；The organic solvent is preferably 0.01~10 parts by weight, more preferably 0.45~5 parts by weight, then
Preferably 0.45~3 parts by weight, most preferably 0.45~1 parts by weight；The organic solvent is well known to those skilled in the art
Organic solvent, has no special limitation, in the present invention preferably low chain tra nsfer, low molecular weight fatty alcohol, low chain tra nsfer,
One of the aromatic compound or a variety of of the aliphatic hydrocarbon of low molecular weight and low chain tra nsfer, low molecular weight, more preferably methanol,
One of ethyl alcohol, the tert-butyl alcohol, benzene and toluene are a variety of, are further preferably methanol, one of benzene and the tert-butyl alcohol or a variety of.
Polymerized monomer, initiator are mixed in static mixer with organic solvent, obtain mixed liquor；It is excellent in the present invention
Choosing first mixes initiator with organic solvent, obtains initiator solution；Then again by initiator solution and polymerized monomer in static state
It is mixed in mixer；The initiator is mixed with organic solvent preferably to carry out under low-temperature protection；The initiator solution and poly-
Closing the time that monomer mixes in static mixer is preferably 1~20s.In the present invention preferably simultaneously by polymerized monomer and initiation
Agent solution is passed through in static mixer, and the feed time of polymerized monomer need to match and identical with the feed time of initiator solution,
Adoptable mode sets atomising device as reduced initiator solution inlet amount at outlet nozzle, to increase polymerized monomer
With the mixture homogeneity of initiator solution, to improve production efficiency, while meeting the safety factor of operation.It is described static mixed
Clutch is static mixer well known to those skilled in the art, has no special limitation, and preferably SV type is quiet in the present invention
State mixer, SK type static mixer or SX static mixer, more preferably SV type static mixer.
The mixed liquor is mixed with desalted water；Preferably first desalted water is heated in the present invention, i.e., in a manner of hot feed
It is added, to shorten polymerization time；It is preferred that desalted water is heated to 40 DEG C~90 DEG C, 60 DEG C~90 DEG C are more preferably heated to,
70 DEG C~90 DEG C are further preferably heated to, is most preferably heated to 80 DEG C, then mix with mixed liquor.The mixing is preferably in polymerization reaction
It is carried out in kettle, to reduce the polymerized monomer and initiator in mixed liquor, it is preferred to use a small amount of desalted water rinses static mixer, will
It is also added in reaction system.
According to the present invention, various additives preferably can also be added in reaction system on demand, as suspending agent, polymerization regulator,
One of polymerization inhibitor, pH adjusting agent, scale preventative and defoaming agent are a variety of；The suspending agent is known to those skilled in the art
Suspending agent, have no special limitation, can be dispersing agent, surfactant or polyvinyl alcohol water solution, it is preferably poly-
Vinyl alcohol aqueous solution；The concentration of the polyvinyl alcohol water solution is preferably 5%~20%, and more preferably 5%~15%, further preferably
It is 10%；The degree of polymerization of the polyvinyl alcohol is preferably 1000~2500, and more preferably 1500~2000, it is further preferably 1700；
The alcoholysis degree of the polyvinyl alcohol is preferably 70%~90% (mole), more preferably 80%~90% (mole), further preferably for
88% (mole)；By polymerized monomer be 100 parts by weight in terms of, the amount of the suspending agent is preferably 0.01~10 parts by weight, more preferably
It is further preferably 0.5~3 parts by weight for 0.05~5 parts by weight, most preferably 1~2 parts by weight；Suspending agent can make polymerized monomer equal
Even dispersion is in the reaction system.The polymerization regulator is polymerization regulator well known to those skilled in the art, has no spy
Different limitation, preferably one of acetaldehyde, butyraldehyde and mercaptan or a variety of in the present invention；By polymerized monomer be 100 parts by weight in terms of,
The amount of the polymerization regulator is preferably 0.01~10 parts by weight, more preferably 0.05~5 parts by weight, is further preferably 0.5~3 weight
Measure part, most preferably 1~2 parts by weight；The polymerization inhibitor is polymerization inhibitor well known to those skilled in the art, and it is special to have no
It limits, is preferably one of phenolic compound, sulfur-containing compound and the oxide-based compound polymerization inhibitor of N- or more in the present invention
Kind；The pH adjusting agent is pH adjusting agent well known to those skilled in the art, has no special limitation, in the present invention
Preferably sodium bicarbonate；By polymerized monomer be 100 parts by weight in terms of, the amount of the pH adjusting agent is preferably 0.01~10 weight
Part, it is further preferably 0.5~1 parts by weight, most preferably that more preferably 0.05~5 parts by weight, which are further preferably 0.1~3 parts by weight,
0.5 parts by weight.
After mixing, anaerobic under confined conditions, carry out polymerization reaction；The condition of the polymerization reaction is those skilled in the art
Polymeric reaction condition known to member, has no special limitation, the temperature of heretofore described polymerization reaction is preferably 25 DEG C
~50 DEG C；The time of the polymerization reaction is preferably 3~6h.
After reaction, polyvinyl acetate preferably is obtained with after desalination water washing, dehydration, drying.
The polyvinyl acetate is saponified；The method of the saponification is that method well known to those skilled in the art is
Can, have no special limitation, in the present invention preferably by polyvinyl acetate in the methanol solution containing alkali at 5 DEG C~60 DEG C
Alcoholysis is no less than 1.5h.The content of alkali is preferably the 0.5%~3% of polyvinyl acetate quality in the methanol solution, more excellent
It is selected as 1%~2%, is further preferably 1%；The temperature of the saponification is preferably 10 DEG C~60 DEG C, and more preferably 30 DEG C~60 DEG C, then
Preferably 40 DEG C~60 DEG C, most preferably 60 DEG C；The time of the saponification is preferably 1~3h, more preferably 2h.
It after saponification, is preferably dried, obtains polyvinyl alcohol；The temperature of the drying is preferably 70 DEG C~90 DEG C, more excellent
It is selected as 80 DEG C；The time of the drying is preferably 1~5h, more preferably 1~3h, is further preferably 2h.
The present invention first through vinylacetate and initiator in static mixer after mixing, then be mixed into desalted water
Row suspension polymerisation, the polyvinyl alcohol degree of polymerization made is higher and narrowly distributing；And when preparation method of the invention has polymerization
Between the advantages of short, speed is fast, synthesis technology is simple and convenient to operate, pipeline is not likely to produce monomer autohemagglutination, be suitable for industrialization, preparation
Obtained polyvinyl alcohol is applicable to the application fields such as production polyvinyl alcohol polaroid, high strength and modulus vinal,
It has a vast market foreground.
The present invention also provides a kind of polyvinyl alcohol of above method preparation；The degree of polymerization of the polyvinyl alcohol is preferably
1000~30000, more preferably 2000~20000, it is further preferably 3000~10000；The dispersion degree of the polyvinyl alcohol is preferred
It is 1.3~1.8.The degree of polymerization in the present invention refers to that the polyvinyl alcohol (PVA) obtained by polyvinyl acetate (PVAc) saponification is viscous equal
Fully saponified or partly-hydrolysed product can be obtained from the PVAc that obtains of the present invention in the degree of polymerization, PVA saponification degree can 60%~
99.9% (molar percentage).
The present invention also provides a kind of preparation systems of high polymerization degree narrow ditribution polyvinyl alcohol, comprising:
Polymerization reaction kettle；The polymerization reaction kettle is provided with desalted water feed opening, second charging aperture and discharge port；
The static mixer being connected with the second charging aperture of the polymerization reaction kettle；The static mixer is provided with poly-
Close monomer addition mouth and initiator feed opening；
The scrubbing tower being connected with the discharge port of the polymerization reaction kettle；
The saponification device being connected with the discharge port of the scrubbing tower.
According to the present invention, if you need to which other additives are added, preferably it is added by desalted water feed opening.
It is not special to the charge proportion, charge order and feeding temperature of all raw materials in polymerization reaction kettle charging
Limitation.
The second charging aperture of the polymerization reaction kettle is connected with static mixer；The static mixer is provided with polymerization
Monomer addition mouth and initiator feed opening；It is preferably provided with atomising device at the outlet nozzle of the initiator feed opening, so as to
The mixture homogeneity for increasing polymerized monomer and initiator solution, to improve production efficiency, while meet the safety of operation because
Element.
Fig. 1 is the structural schematic diagram of the preparation system of high polymerization degree narrow ditribution polyvinyl alcohol provided by the invention, wherein 1 is
Static mixer, 2 be vinylacetate feeding pipe, 3 be initiator solution feeding pipe, 4 be desalted water flushing pipeline, M is
The blender of polymerization reaction kettle.
In order to further illustrate the present invention, poly- to a kind of high polymerization degree narrow ditribution provided by the invention with reference to embodiments
The preparation method and preparation system of vinyl alcohol are described in detail.
Reagent used in following embodiment is commercially available.
Embodiment 1
Polymerization reaction kettle is decompressed to 50mmHg, oxygen is removed in vacuum, then under agitation, by 200 parts of 80 DEG C of desalinations
Water, 1 part by 0.1 part of 88% (mole) alcoholysis degree and 1700 degree of polymerization PVA aqueous solution formed in deionized water and 0.5 part of carbon
Sour hydrogen sodium is added in polymerization reaction kettle；Then the VAc by the methanol solution of 0.1 part of 10% azobisisoheptonitrile, with 100 parts
It is sent into SV type static mixer simultaneously, after synchronous charging, reactor temperature is 50 DEG C, by the water temperature for adjusting collet
So that reactor temperature is maintained at 50 DEG C, is carried out continuously the suspension polymerisation of VAc, successive reaction 3 hours.
The polymerization liquid of acquisition is sent into the middle part of scrubbing tower, in bottom input steam, is washed out from tower top unreacted
VAc obtains the aqueous solution of PVAc, after centrifugation and drying, obtains PVAc resin.
It is added in methanol solution (the polyvinyl acetate methanol solution of configuration 20%) and is added in the PVAc resin of acquisition
Sodium hydroxide (for the 1% of polyvinyl acetate quality), solution are saponified at 50 DEG C, in 80 DEG C of dry 2h, obtain PVA, evaluation knot
Fruit is in table 1.
Embodiment 2~5
It polymerize VAc by mode same as Example 1 and obtains PVAc, difference is with polymerization initiator, solvent in table 1
And its dosage, polymerization temperature and polymerization time.Then preparation PVAc methanol solution, and be saponified PVA evaluation result in table 1.
Comparative example 1
Polymerization reaction kettle is decompressed to 50mmHg, oxygen is removed in vacuum, then under agitation, by 200 parts of 80 DEG C of desalinations
Water, 1 part of aqueous solution formed in deionized water by 0.1 part of 88% (mole) alcoholysis degree and 1700 degree of polymerization PVA, 0.5 part of carbon
Sour hydrogen sodium is added in reaction kettle.Then 0.1 part of azobisisoheptonitrile is dissolved in 100 parts of VAc, initiator will have been dissolved
VAc solution be directly added into reaction kettle, after charging, reactor temperature be 50 DEG C, by adjust collet water temperature make instead
It answers temperature in the kettle to be maintained at 50 DEG C, is carried out continuously the suspension polymerisation of VAc, successive reaction 3 hours.
Polymerization liquid is handled according to the identical mode of embodiment 1 and obtains PVAc, prepares PVAc methanol solution, and be saponified
PVA evaluation result is in table 2.
Comparative example 2
Polymerization reaction kettle is decompressed to 50mmHg, oxygen is removed in vacuum then under agitation, by 200 parts of 80 DEG C of desalinations
Water, 1 part of aqueous solution formed in deionized water by 0.1 part of 88% (mole) alcoholysis degree and 1700 degree of polymerization PVA, 0.5 part of carbon
Sour hydrogen sodium, 100 parts of VAc are added in reaction kettle, and 0.1 part of azobisisoheptonitrile is then directly added into reaction kettle by hand hole,
After charging, reactor temperature is 50 DEG C, and the water temperature by adjusting collet makes reactor temperature be maintained at 50 DEG C, continuously
The suspension polymerisation of progress VAc, successive reaction 3 hours.
Polymerization liquid is handled according to the identical mode of embodiment 1 and obtains PVAc, prepares PVAc methanol solution, and be saponified
PVA evaluation result is in table 2.
Comparative example 3~5
It polymerize VAc by mode same as Example 1 and obtains PVAc, difference is with polymerization initiator, solvent in table 2
And its dosage, polymerization temperature and polymerization time.Then preparation PVAc methanol solution, and be saponified PVA evaluation result in table 2.
The polymerizing condition and evaluation result of 1 1~embodiment of embodiment 5 of table
The polymerizing condition and evaluation result of 2 1~comparative example of comparative example 5 of table
Wherein, a small amount of monomer autohemagglutination can occur for comparative example 1, and monomer delivery pipe road can generate polymer mud, influence to produce
Efficiency.
Claims (8)
1. a kind of preparation method of high polymerization degree narrow ditribution polyvinyl alcohol characterized by comprising
S1 polymerized monomer, initiator are mixed in static mixer with organic solvent), obtain mixed liquor；The polymerized monomer
Including vinylacetate；By polymerized monomer be 100 parts by weight in terms of, the desalted water be 100~300 parts by weight, the initiator
For 0.01~0.3 parts by weight, the organic solvent is 0.01~10 parts by weight；It states initiator and is selected from the bis- (4- of dicetyl peroxydicarbonate
Tert-butylcyclohexyl) ester, peroxidating neodecanoic acid -2,4,4- trimethyl pentyl ester, cumyl peroxyneodecanoate, peroxidating hexamethylene
One of base sulphonyl acetyl and azobisisoheptonitrile are a variety of；
S2) mixed liquor is mixed with desalted water, anaerobic under confined conditions, carry out polymerization reaction, obtain polyvinyl acetate
Ester；
S3) polyvinyl acetate is saponified, obtains polyvinyl alcohol.
2. preparation method according to claim 1, which is characterized in that the organic solvent is selected from low chain tra nsfer, low molecule
The fatty alcohol of amount, the aliphatic hydrocarbon and one of low chain tra nsfer, the aromatic compound of low molecular weight of low chain tra nsfer, low molecular weight
Or it is a variety of.
3. preparation method according to claim 1, which is characterized in that the organic solvent is selected from methanol, ethyl alcohol, tertiary fourth
One of alcohol, benzene and toluene are a variety of.
4. preparation method according to claim 1, which is characterized in that the temperature of the polymerization reaction is 25 DEG C~50 DEG C；
The time of polymerization reaction is 3~6h.
5. preparation method according to claim 1, which is characterized in that the step S1) specifically:
Initiator is mixed with organic solvent, obtains initiator solution；
The initiator solution is mixed in static mixer with polymerized monomer, obtains mixed liquor.
6. preparation method according to claim 1, which is characterized in that the step S2) in desalted water is first heated to 40
DEG C~90 DEG C, then mixed again with mixed liquor.
7. preparation method according to claim 1, which is characterized in that the static mixer is selected from SV type static mixing
Device, SK type static mixer or SX static mixer.
8. a kind of preparation system of high polymerization degree narrow ditribution polyvinyl alcohol characterized by comprising
Polymerization reaction kettle；The polymerization reaction kettle is provided with desalted water feed opening, second charging aperture and discharge port；
The static mixer being connected with the second charging aperture of the polymerization reaction kettle；It is single that the static mixer is provided with polymerization
Body feed opening and initiator feed opening；
The scrubbing tower being connected with the discharge port of the polymerization reaction kettle；
The saponification device being connected with the discharge port of the scrubbing tower.
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| CN103172774A (en) * | 2013-04-08 | 2013-06-26 | 四川大学 | Preparation method of polyvinyl alcohol with high polymerization degree and narrow dispersion and application of polyvinyl alcohol |
| CN105646751A (en) * | 2016-01-11 | 2016-06-08 | 云南云天化股份有限公司 | Polyvinyl alcohol and preparation method thereof, and polyvinyl alcohol film |
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| CN103554314B (en) * | 2013-11-08 | 2015-12-02 | 安徽皖维集团有限责任公司 | Production method of high-purity polyvinyl alcohol |
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| CN103172774A (en) * | 2013-04-08 | 2013-06-26 | 四川大学 | Preparation method of polyvinyl alcohol with high polymerization degree and narrow dispersion and application of polyvinyl alcohol |
| CN105646751A (en) * | 2016-01-11 | 2016-06-08 | 云南云天化股份有限公司 | Polyvinyl alcohol and preparation method thereof, and polyvinyl alcohol film |
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