CN110423295A - A kind of PVB production technology and its application based on plate heat exchanger cooling - Google Patents
A kind of PVB production technology and its application based on plate heat exchanger cooling Download PDFInfo
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- CN110423295A CN110423295A CN201910726943.5A CN201910726943A CN110423295A CN 110423295 A CN110423295 A CN 110423295A CN 201910726943 A CN201910726943 A CN 201910726943A CN 110423295 A CN110423295 A CN 110423295A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/01—Processes of polymerisation characterised by special features of the polymerisation apparatus used
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/28—Condensation with aldehydes or ketones
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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Abstract
The present invention provides a kind of PVB production technology and its application based on plate heat exchanger cooling, belongs to technical field of polymer materials.The present invention is by actual production, heat exchange cooling is carried out to the polyvinyl alcohol of high alcoholysis degree based on the plate heat exchanger for being passed through ethylene glycol, to achieve the purpose that fast cooling, compared with prior art, the present invention can effectively save temperature fall time 8-10 hours, so as to shorten the production cycle, PVB yield and production efficiency are improved.Therefore with the value of good practical application.
Description
Technical field
The invention belongs to technical field of polymer materials, and in particular to a kind of PVB production based on plate heat exchanger cooling
Technique and its application.
Background technique
Disclosing the information of the background technology part, it is only intended to increase understanding of the overall background of the invention, without certainty
It is considered as recognizing or implying in any form that information composition has become existing skill well known to persons skilled in the art
Art.
Polyvinyl butyral (PVB) be by polyvinyl alcohol (abbreviation PVA) and n-butanal under inorganic acid catalysis through acetal
Change reaction to obtain.By the PVB glue film of the preparations such as PVB resin, plasticizer and auxiliary agent because having very excellent translucency, weather-proof
The features such as property, cementability, impact resistance and be widely used in the industries such as automobile, building, photovoltaic.
The existing synthesis technology of PVB resin is divided into homogeneous method and two kinds of multi-phases process.It is starting that homogeneous method, which is usually with PVA,
Object, alcoholysis and acetalation carry out simultaneously, then obtain finished product through precipitating, washing, drying and other steps.Multi-phases process is with PVA
PVA grain dissolution is first made PVA aqueous solution, adds n-butanal and acidic catalyst, gradually react at low temperature by starting material
And PVB powder end is precipitated, PVB powder end is washed again, drying and other steps obtain finished product.Homogeneous method is gradually abandoned due to complex process
With heterogeneous rule is widely used because of relatively simple last handling process.
However, the water solubility of PVA is related with its alcoholysis degree, the product water solubility that general alcoholysis degree is 87%~89% is most
It is good, regardless of still can soon dissolve in the hot water in cold water, show maximum solubility.Alcoholysis degree is 89%~90%
Above product need to generally be heated to 60~70 DEG C to be completely dissolved.The polyvinyl alcohol that alcoholysis degree is 99% or more is dissolved only in
In 95 DEG C of hot water, and alcoholysis degree can only be dissolved in cold water in 75%~80% product, not dissolve in hot water.Therefore in actual production
In, when raw material needs to heat using the polyvinyl alcohol (such as PVA1799, PVA2099, PVA2499) that alcoholysis degree is 99% or more
It is dissolved to 95 DEG C, poly-vinyl alcohol solution must be down to low temperature (such as 10 DEG C of left sides again when then carrying out subsequent condensation reaction
It is right), it be easy to cause the production cycle long using conventional method cool-down method, consumption is big, is unfavorable for the raising of production efficiency.
Summary of the invention
In view of the above shortcomings of the prior art, the present invention provides a kind of PVB production technology based on plate heat exchanger cooling,
The present invention is by actual production exchanging heat to the polyvinyl alcohol of high alcoholysis degree based on the plate heat exchanger for being passed through ethylene glycol
Cooling effectively shortens the production cycle to achieve the purpose that fast cooling, improves PVB yield and production efficiency, therefore have good
The value of good practical application.
The first aspect of the invention provides a kind of PVB production technology based on plate heat exchanger cooling, the production work
Skill includes at least, and when using high alcoholysis degree polyvinyl alcohol using multi-phases process production PVB material, dissolved high alcoholysis degree is gathered
Glycohol solution is cooled to condensation temp using plate heat exchanger heat exchange；
Further, the plate heat exchanger is passed through ethylene glycol, to achieve the purpose that fast cooling, ethylene glycol viscosity compared with
It is low, and mobile phase is preferable, so there is good heat exchange performance, simultaneously as ethylene glycol is nonflammable, therefore in actual production
In it is more safe and reliable.
Further, the high alcoholysis degree polyvinyl alcohol includes at least alcoholysis degree in the poly- second of 89% or more (including 89%)
Enol is further polyvinyl alcohol of the alcoholysis degree in 99% or more (including 99%)；Preferably PVA1799, PVA2099 or
PVA2499。
Further, the production technology includes at least: will dissolve complete high alcoholysis degree poly-vinyl alcohol solution and passes through plate
Frame filter press filters pressing, filters pressing solution are down to condensation temp entrance by solution temperature by being passed through the plate heat exchanger temperature of ethylene glycol
Acetal kettle.Compared with prior art, the present invention can effectively save temperature fall time 8-10 hours, so as to shorten the production cycle, improve
Production efficiency.
Further, a kind of PVB production technology based on plate heat exchanger cooling is provided, the PVB production technology includes:
S1, it water is added into PVA is warming up to 95 DEG C to being completely dissolved；
S2, complete high alcoholysis degree poly-vinyl alcohol solution will be dissolved by plate and frame filter press filters pressing, filters pressing solution is by logical
The plate heat exchanger for entering ethylene glycol exchanges heat, and butyraldehyde is added when being down to 45~55 DEG C (preferably 50 DEG C) by 95 DEG C in temperature, so
The plate heat exchanger for being passed through ethylene glycol again afterwards carries out entering contracting after heat exchange is cooled to 8~12 DEG C (preferably 10 DEG C) addition hydrochloric acid
Aldehyde kettle keeps the temperature 0.4~0.8 hour (preferably 0.5 hour)；
S3,60~70 DEG C (preferably 65 DEG C) heat preservations 1.8~2.2 hours (preferably 2 hours) are warming up to by being passed through second
The plate heat exchanger of glycol is cooled to 30 DEG C or less (containing 30 DEG C)；
S4, be added water be stirred after drain, then be added water impregnate, repeatedly the operation until detect it is no acidic,
Without chlorine root, being warming up to 45~55 DEG C (preferably 50 DEG C), addition sodium hydroxide makes pH be maintained 8-9 afterwards, stablizes processing 4~6 hours
(preferably 5 hours), cooling be washed to detection it is no acidic, without chlorine root.
Further, it in the step S3, is exchanged heat using plate heat exchanger, temperature is cooled to 30 DEG C or less by 70~80 DEG C
Control heat-exchange temperature is 0.5~1h when (containing 30 DEG C).
Further, in above steps, the water used is deionized water；
The butyraldehyde is rectifying butyraldehyde, and content is 99% or more；
The hydrochloric acid is colorless and transparent rectifying hydrochloric acid；
Further, the mass ratio of the PVA, water, butyraldehyde and hydrochloric acid is 100:1200~1300:50~70:25~35
(preferably 100:1250:60:30)；
The PVA is PVA2099；
Further, the PVB production technology further includes after the product for preparing step S4 dehydrates up to PVB resin
Material.
The second aspect of the invention provides above-mentioned production technology in energy-saving, raising PVB yield and production efficiency
Application.
Advantageous effects of the present invention: the present invention provides a kind of PVB production technology based on plate heat exchanger cooling, this hair
It is bright by carrying out heat exchange cooling to the polyvinyl alcohol of high alcoholysis degree based on the plate heat exchanger for being passed through ethylene glycol in actual production,
To achieving the purpose that fast cooling, to effectively shorten the production cycle, PVB yield and production efficiency are improved, therefore have good
The value of good practical application.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As previously mentioned, in actual production, when raw material the use of alcoholysis degree is 99% or more polyvinyl alcohol (such as PVA1799,
PVA2099, PVA2499 etc.) it needs to be heated to 95 DEG C and is dissolved, it again must be by polyethylene when then carrying out subsequent condensation reaction
Alcoholic solution is down to low temperature (such as 10 DEG C or so), be easy to cause the production cycle long using conventional method cool-down method, and consumption is big, unfavorable
In the raising of production efficiency.
In view of this, it is raw to provide a kind of PVB based on plate heat exchanger cooling in the specific embodiment of the present invention
Production. art, the production technology include at least, will when using high alcoholysis degree polyvinyl alcohol using multi-phases process production PVB material
Dissolved high alcoholysis degree poly-vinyl alcohol solution is cooled to condensation temp using plate heat exchanger heat exchange；
In still another embodiment of the invention, the plate heat exchanger is passed through ethylene glycol, to reach fast cooling
Purpose, ethylene glycol viscosity is lower, and mobile phase is preferable, thus have good heat exchange performance, simultaneously as ethylene glycol is not
It is more safe and reliable with combustibility, therefore in actual production.
In still another embodiment of the invention, the high alcoholysis degree polyvinyl alcohol include at least alcoholysis degree 89% with
The polyvinyl alcohol of upper (including 89%) is further polyvinyl alcohol of the alcoholysis degree in 99% or more (including 99%)；Preferably
PVA1799, PVA2099 or PVA2499 (further preferably PVA2099).
In still another embodiment of the invention, the production technology is included at least: will dissolve complete high alcoholysis degree
Poly-vinyl alcohol solution is by plate and frame filter press filters pressing, and filters pressing solution is by being passed through the plate heat exchanger temperature of ethylene glycol by dissolution temperature
Degree is down to condensation temp and enters acetal kettle.Compared with prior art, the present invention can effectively save temperature fall time 8-10 hours, thus
Shorten the production cycle, improves production efficiency.
In still another embodiment of the invention, a kind of PVB production technology based on plate heat exchanger cooling, institute are provided
Stating PVB production technology includes:
S1, it deionized water is added into PVA is warming up to 95 DEG C to being completely dissolved；
S2, complete high alcoholysis degree poly-vinyl alcohol solution will be dissolved by plate and frame filter press filters pressing, filters pressing solution is by logical
The plate heat exchanger temperature for entering ethylene glycol is down to 45~55 DEG C (preferably 50 DEG C) addition butyraldehyde by 95 DEG C, is then cooled to 8 again
Enter acetal kettle after~12 DEG C (preferably 10 DEG C) addition hydrochloric acid and keeps the temperature 0.4~0.8 hour (preferably 0.5 hour)；
S3, after being warming up to 60~70 DEG C (preferably 65 DEG C) heat preservations 1.8~2.2 hours (preferably 2 hours), through being passed through second
The plate heat exchanger of glycol is cooled to 30 DEG C or less (containing 30 DEG C)；
S4, be added water be stirred after drain, then be added water impregnate, repeatedly the operation until detect it is no acidic,
Without chlorine root, being warming up to 45~55 DEG C (preferably 50 DEG C), addition sodium hydroxide makes pH be maintained 8-9 afterwards, stablizes processing 4~6 hours
(preferably 5 hours), cooling be washed to detection it is no acidic, without chlorine root.
In still another embodiment of the invention, further, in the step S3, exchanged heat using plate heat exchanger,
Control heat-exchange temperature is 0.5~1h when temperature is cooled to 30 DEG C or less (containing 30 DEG C) by 60~70 DEG C；Inventors have found that the step
Heat-exchange time is very big on PVB yield and acetalizing degree influence, and heat-exchange time is too long or too short, will lead to generation PVB and largely analyses
Out, it is adhered agglomeration, so that PVB yield and the decline of PVB acetalizing degree；
In still another embodiment of the invention, in above steps, the water used is deionized water；
The butyraldehyde is rectifying butyraldehyde, and content is 99% or more；
The hydrochloric acid is colorless and transparent rectifying hydrochloric acid；
In still another embodiment of the invention, the PVA, deionized water, butyraldehyde and hydrochloric acid mass ratio be 100:
1200~1300:50~70:25~35 (preferably 100:1250:60:30)；
In still another embodiment of the invention, the PVB production technology further includes taking off product prepared by step S4
Up to PVB resin material after water is dry.
In still another embodiment of the invention, above-mentioned production technology is provided in energy-saving, raising PVB production efficiency
In application.
Explanation is further explained to the present invention by the following examples, but is not construed as limiting the invention.It should be understood that
These examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.Actual conditions are not specified in the following example
Test method, carry out usually according to normal condition.Water used in each embodiment is deionized water, and the butyraldehyde is rectifying
Butyraldehyde, content is 99% or more；The hydrochloric acid is colorless and transparent rectifying hydrochloric acid.
Embodiment 1
In dissolution kettle, feed intake according to 50 mass parts 2099PVA, 625 mass parts water, be heated to 95 DEG C completely it is molten
Solution.Complete 2099PVA solution will be dissolved by plate and frame filter press filters pressing, filters pressing solution passes through the plate-type heat-exchange for being passed through ethylene glycol
Device temperature is down to 50 DEG C by 95 DEG C, and 30 mass parts butyraldehyde are added, are then cooled to using the plate heat exchanger for being passed through ethylene glycol
10 DEG C, enter acetal kettle heat preservation 0.5 hour after 60 mass parts hydrochloric acid are added；Being warming up to 65 DEG C of heat preservations is after 2 hours, by being passed through
The plate heat exchanger of ethylene glycol is cooled to 30 DEG C, and cooling heat-exchange time is 1h herein for control；It is added after water is stirred and drains, so
Water is added afterwards to impregnate, repeatedly the operation until detect it is no acidic, without chlorine root, sodium hydroxide is added after being warming up to 50 DEG C makes pH
8 are maintained, stablizes processing 5 hours, cooling is washed to anacidity can discharge without chlorine；Drying and packaging after centrifugal dehydration.Through counting,
PVB yield is 653 parts, acetalizing degree 54%.
Embodiment 2
In dissolution kettle, feed intake according to 50 mass parts 2099PVA, 610 mass parts water, be heated to 95 DEG C completely it is molten
Solution.Complete 2099PVA solution will be dissolved by plate and frame filter press filters pressing, filters pressing solution passes through the plate-type heat-exchange for being passed through ethylene glycol
Device temperature is down to 50 DEG C by 95 DEG C, and 28 mass parts butyraldehyde are added and are cooled to then using the plate heat exchanger for being passed through ethylene glycol
Enter acetal kettle after 10 DEG C of 60 mass parts hydrochloric acid of addition and keeps the temperature 0.5 hour；Being warming up to 65 DEG C of heat preservations is after 2 hours, by being passed through
The plate heat exchanger of ethylene glycol is cooled to 30 DEG C, and cooling heat-exchange time is 0.5h herein for control；It is added after water is stirred and drains,
Then water is added to impregnate, repeatedly the operation until detect it is no acidic, without chlorine root, sodium hydroxide is added after being warming up to 50 DEG C to be made
PH is maintained 8, stablizes processing 5 hours, cooling is washed to anacidity can discharge without chlorine；Drying and packaging after centrifugal dehydration.Through counting,
PVB yield is 645 parts, acetalizing degree 52%.
Embodiment 3
In dissolution kettle, feed intake according to 50 mass parts 2099PVA, 650 mass parts water, be heated to 95 DEG C completely it is molten
Solution.Complete 2099PVA solution will be dissolved by plate and frame filter press filters pressing, filters pressing solution passes through the plate-type heat-exchange for being passed through ethylene glycol
Device temperature is down to 50 DEG C by 95 DEG C, and 30 mass parts butyraldehyde are added and are cooled to then using the plate heat exchanger for being passed through ethylene glycol
Enter acetal kettle after 10 DEG C of 65 mass parts hydrochloric acid of addition and keeps the temperature 0.6 hour；Being warming up to 65 DEG C of heat preservations is after 2 hours, by being passed through
The plate heat exchanger of ethylene glycol is cooled to 30 DEG C, and cooling heat-exchange time is 0.8h herein for control；It is added after water is stirred and drains,
Then water is added to impregnate, repeatedly the operation until detect it is no acidic, without chlorine root, sodium hydroxide is added after being warming up to 50 DEG C to be made
PH is maintained 8, stablizes processing 5 hours, cooling is washed to anacidity can discharge without chlorine；Drying and packaging after centrifugal dehydration.Through counting,
PVB yield is 627 parts, acetalizing degree 51%.
Experimental example 1
In dissolution kettle, feed intake according to 50 mass parts 2099PVA, 625 mass parts water, be heated to 95 DEG C completely it is molten
Solution.Complete 2099PVA solution will be dissolved by plate and frame filter press filters pressing, filters pressing solution passes through the plate-type heat-exchange for being passed through ethylene glycol
Device temperature is down to 50 DEG C by 95 DEG C, and 30 mass parts butyraldehyde are added, are then cooled to using the plate heat exchanger for being passed through ethylene glycol
10 DEG C, enter acetal kettle heat preservation 0.5 hour after 60 mass parts hydrochloric acid are added；Being warming up to 65 DEG C of heat preservations is after 2 hours, by being passed through
The plate heat exchanger of ethylene glycol is cooled to 30 DEG C, and cooling heat-exchange time is 2h herein for control；It is added after water is stirred and drains, so
Water is added afterwards to impregnate, repeatedly the operation until detect it is no acidic, without chlorine root, sodium hydroxide is added after being warming up to 50 DEG C makes pH
8 are maintained, stablizes processing 5 hours, cooling is washed to anacidity can discharge without chlorine；Drying and packaging after centrifugal dehydration.Through counting,
PVB yield is 518 parts, acetalizing degree 42%.
Experimental example 2
In dissolution kettle, feed intake according to 50 mass parts 2099PVA, 625 mass parts water, be heated to 95 DEG C completely it is molten
Solution.Complete 2099PVA solution will be dissolved by plate and frame filter press filters pressing, filters pressing solution passes through the plate-type heat-exchange for being passed through ethylene glycol
Device temperature is down to 50 DEG C by 95 DEG C, and 30 mass parts butyraldehyde are added, are then cooled to using the plate heat exchanger for being passed through ethylene glycol
10 DEG C, enter acetal kettle heat preservation 0.5 hour after 60 mass parts hydrochloric acid are added；Being warming up to 65 DEG C of heat preservations is after 2 hours, by being passed through
The plate heat exchanger of ethylene glycol is cooled to 30 DEG C, and cooling heat-exchange time is 0.3h herein for control；It is added after water is stirred and drains,
Then water is added to impregnate, repeatedly the operation until detect it is no acidic, without chlorine root, sodium hydroxide is added after being warming up to 50 DEG C to be made
PH is maintained 8, stablizes processing 5 hours, cooling is washed to anacidity can discharge without chlorine；Drying and packaging after centrifugal dehydration.Through counting,
PVB yield is 524 parts, acetalizing degree 41%.
It should be noted that above example is only used to illustrate the technical scheme of the present invention rather than is limited.Although ginseng
It is described the invention in detail according to given example, but those skilled in the art can be as needed to this hair
Bright technical solution is modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. a kind of PVB production technology based on plate heat exchanger cooling, which is characterized in that the production technology includes at least, and makes
When with high alcoholysis degree polyvinyl alcohol using multi-phases process production PVB material, dissolved high alcoholysis degree poly-vinyl alcohol solution is adopted
Condensation temp is cooled to plate heat exchanger heat exchange.
2. PVB production technology as described in claim 1, which is characterized in that the plate heat exchanger is passed through ethylene glycol.
3. PVB production technology as described in claim 1, which is characterized in that the high alcoholysis degree polyvinyl alcohol includes at least alcohol
Xie Du is in the polyvinyl alcohol of 89% or more (including 89%), preferably polyethylene of the alcoholysis degree in 99% or more (including 99%)
Alcohol；Most preferably PVA2099.
4. PVB production technology as described in claim 1, which is characterized in that the production technology includes at least: dissolution is complete
High alcoholysis degree poly-vinyl alcohol solution by plate and frame filter press filters pressing, filters pressing solution is by being passed through the plate heat exchanger temperature of ethylene glycol
Degree is down to condensation temp by solution temperature and enters acetal kettle.
5. a kind of PVB production technology based on plate heat exchanger cooling, which is characterized in that the PVB production technology includes:
S1, it deionized water is added into PVA2099 is warming up to 95 DEG C to being completely dissolved；
S2, complete high alcoholysis degree poly-vinyl alcohol solution will be dissolved by plate and frame filter press filters pressing, filters pressing solution is by being passed through second
The plate heat exchanger temperature of glycol is down to 45~55 DEG C (preferably 50 DEG C) addition butyraldehyde by 95 DEG C, is then cooled to 8~12 again
DEG C (preferably 10 DEG C), which are added after hydrochloric acid, to be entered acetal kettle and keeps the temperature 0.4~0.8 hour (preferably 0.5 hour)；
S3, be warming up to 60~70 DEG C (preferably 65 DEG C) heat preservations be cooled to after (preferably 2 hours) within 1.8~2.2 hours 30 DEG C with
Under；
S4, be added water be stirred after drain, then be added water impregnate, repeatedly the operation until detect it is no acidic, without chlorine
Root, being warming up to 45~55 DEG C (preferably 50 DEG C), addition sodium hydroxide makes pH be maintained 8-9 afterwards, stablizes processing 4~6 hours (preferably 5
Hour), cooling be washed to detection it is no acidic, without chlorine root.
6. PVB production technology as claimed in claim 5, which is characterized in that the water used is deionized water.
7. PVB production technology as claimed in claim 5, which is characterized in that the butyraldehyde is rectifying butyraldehyde；The hydrochloric acid is essence
Evaporate hydrochloric acid.
8. PVB production technology as claimed in claim 5, which is characterized in that the PVA2099, deionized water, butyraldehyde and hydrochloric acid
Mass ratio be 100:1200~1300:50~70:25~35 (preferably 100:1250:60:30).
9. PVB production technology as claimed in claim 5, which is characterized in that the PVB production technology further includes by step S4 system
Up to PVB resin material after standby product dehydration and drying.
10. application of any one of the claim 1-9 production technology in energy-saving, raising PVB yield and production efficiency.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943385A (en) * | 2021-11-19 | 2022-01-18 | 大冶海通热工技术有限公司 | PVB production process based on plate heat exchanger cooling |
| WO2023089053A1 (en) * | 2021-11-18 | 2023-05-25 | Kuraray Europe Gmbh | Polyvinyl acetals with improved residual particle size distribution |
-
2019
- 2019-08-07 CN CN201910726943.5A patent/CN110423295A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023089053A1 (en) * | 2021-11-18 | 2023-05-25 | Kuraray Europe Gmbh | Polyvinyl acetals with improved residual particle size distribution |
| CN113943385A (en) * | 2021-11-19 | 2022-01-18 | 大冶海通热工技术有限公司 | PVB production process based on plate heat exchanger cooling |
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