CN203346316U - Polyvinyl alcohol producing system - Google Patents
Polyvinyl alcohol producing system Download PDFInfo
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- CN203346316U CN203346316U CN 201320295571 CN201320295571U CN203346316U CN 203346316 U CN203346316 U CN 203346316U CN 201320295571 CN201320295571 CN 201320295571 CN 201320295571 U CN201320295571 U CN 201320295571U CN 203346316 U CN203346316 U CN 203346316U
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- polyvinyl alcohol
- polymeric kettle
- production system
- preheater
- polymerization
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Abstract
The utility model provides a polyvinyl alcohol producing system. The polyvinyl alcohol producing system comprises a preheater, a polymerization kettle connected with the preheater, and a condenser forming a closed loop with the polymerization kettle, wherein a delivery pump is connected to the outlet of the polymerization kettle. The polyvinyl alcohol producing system can prolong the polymerization reaction time to make the reaction more thorough, improves the conversion rate and improves the yield and the quality of PVA (polyvinyl alcohol) products.
Description
Technical field
The present invention relates to the production system of polyvinyl alcohol.
Background technology
Vinyl acetate (VAC) is a kind of chemical intermediate commonly used, in its molecule, contains vinyl, can carry out polyreaction, and its polymerisate polyvinyl acetate (PVA) (PVAC) is the raw material for preparing polyvinyl alcohol (PVA).At present in the technique of suitability for industrialized production PVAC, the polymerization process of PVAC is to adopt monomer VAC to carry out free radical solution polymerization in solvent, comprise the preparation of initiator, the polymerization of monomer, separation and the rectifying of polymer fluid, described batching be take methyl alcohol exactly as solvent, will add in polymeric kettle and carry out polyreaction by the monomer VAC of proportioning metering, solvent, initiator etc.After polymerization completes, polymerization gained PVAC-methanol solution is separated, steam residual monomer VAC, obtain the methanol solution of PVAC, more further VAC and methyl alcohol are reclaimed in rectifying.
The process very complex of VAC polymerization PVAc, very wayward.Existing two still polyreaction production control systems, the longest can only reaching about 6.5h of reaction times, the minimum polymerization degree of PVA product can only reach 400 left and right, after the simultaneous reactions time lengthening, the output decrease of polymerization, affect production efficiency, causes the load of the distillation system in polymerization and downstream not mate, cause the quality product of polymerization to descend, affect the visual appearance of PVA product.
General polyvinyl alcohol polymerization production system, percent polymerization is low, and Quality and yield is unsatisfactory.Be difficult to produce the PVA product of ultra-low viscosity, when producing low polymerization degree, low viscous PVA product, when percent polymerization surpasses 80% simultaneously, the initiator adding rate is high, and high initiator adding rate causes the low viscosity PVA quality product inferior, the color jaundice, have a strong impact on quality product; And low viscosity PVA is difficult to moulding, and cause the frequent fault of force feed.
The utility model content
The invention provides a kind of production system of polyvinyl alcohol, can effectively improve output and the quality of PVA product.
The objective of the invention is to realize by following measures:
A kind of production system of polyvinyl alcohol, comprise preheater, the polymeric kettle be connected with preheater, and with the condenser of polymeric kettle formation loop line, the discharge port of described polymeric kettle connects pump.Raw material, after the preheater heating, enters polymeric kettle and carries out polyreaction, and the heat that condenser discharges reaction carries out cooling, keeps the temperature of polymeric kettle.
In order to improve reaction efficiency, above-mentioned polymeric kettle is preferably 3 arranged in series.
In order to improve temperature of reaction, preheater is preferably 2.Material enters before aforesaid reaction vessel by the heating that heats up of the first preheater, in order to improve the utilization ratio of heat, the second preheater is set after the first preheater, and the heat produced with the polymeric kettle reaction is to the material preheating of feeding in raw material.
In order to improve the stability of material reaction, be provided with current return circuit between above-mentioned polymeric kettle, guarantee the stable of reactor liquid level.
In order to make temperature of reaction stable, above-mentioned polymeric kettle periphery cover has chuck, is provided with water outlet and water port, by the jacket water (J.W.) that constantly passes into constant temperature, is incubated.
In order to dispel the heat, above-mentioned polymeric kettle top respectively arranges a condenser, for the condensation polyreaction, puts thermogenetic steam, and it is cooling that condenser uses recirculated water to carry out, and cooled material turns back in polymeric kettle proceeds reaction.
In order to make reaction more even, above-mentioned polymeric kettle is provided with agitator.
beneficial effect
1. production system of the present utility model has successfully realized effective control of complex reaction process, and whole system is highly stable, sustainability is long, effectively extend polymerization time on the one hand, made polyreaction more thoroughly fully, thereby improved percent polymerization and the output of PVA product, guaranteed again on the other hand the quality of product, the PVA formed product made is good, and particles no longer has powder phenomenon-tion, has overcome the problem that causes the alcoholysis force feed system fault.
2. the utility model can be used for the production of the PVA product of multiple product rule, but the production polymerization degree is low to moderate 300 PVA product, but the PVA product such as the also production polymerization degree is 400,500.
The accompanying drawing explanation
The equipment schematic diagram that Fig. 1 is embodiment 1.
The equipment schematic diagram that Fig. 2 is embodiment 2.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
embodiment 1
A kind of production system of polyvinyl alcohol comprises the first preheater 2 and the second preheater 3, and the polymeric kettle 1 be connected with preheater 2 forms the condenser 4 of loop line with each polymeric kettle, and the discharge port of polymeric kettle connects prestige and agree pump 5, and raw material passes into from 7, and product is from 8 pass-outs.As Fig. 1.
embodiment 2
A kind of production system of polyvinyl alcohol comprises the first preheater 2 and the second preheater 3, the polymeric kettle 1 be connected with preheater 3, condenser 4 with each polymeric kettle formation loop line, the discharge port of polymeric kettle connects prestige and agree pump 5, is provided with current return circuit 12 between polymeric kettle, and polymeric kettle periphery cover has chuck 9, be provided with water inlet 10 and water port 11, polymeric kettle is provided with agitator 6, and diluent can pass into from 13, as Fig. 2.
Above demonstration and describe ultimate principle of the present utility model and the advantage of principal character and utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification sheets, describes just illustrates principle of the present utility model; do not breaking away under the utility model spirit and scope prerequisite; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.
Claims (9)
1. the production system of a polyvinyl alcohol, is characterized in that comprising preheater, the polymeric kettle be connected with preheater, and with the condenser of polymeric kettle formation loop line, the discharge port of described polymeric kettle connects pump.
2. the production system of polyvinyl alcohol as claimed in claim 1, is characterized in that described polymeric kettle is 3 arranged in series.
3. the production system of polyvinyl alcohol as claimed in claim 1 or 2, is characterized in that preheater is 2 arranged in series.
4. the production system of polyvinyl alcohol as claimed in claim 1 or 2, is characterized in that between polymeric kettle being provided with current return circuit.
5. the production system of polyvinyl alcohol as claimed in claim 3, is characterized in that between polymeric kettle being provided with current return circuit.
6. the production system of polyvinyl alcohol as claimed in claim 1 or 2, is characterized in that described polymeric kettle periphery cover has chuck, is provided with water inlet and water port.
7. the production system of polyvinyl alcohol as claimed in claim 4, is characterized in that described polymeric kettle periphery cover has chuck, is provided with water outlet and water port.
8. the production system of polyvinyl alcohol as claimed in claim 6, is characterized in that described polymeric kettle is provided with agitator.
9. the production system of polyvinyl alcohol as claimed in claim 7, is characterized in that described polymeric kettle is provided with agitator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320295571 CN203346316U (en) | 2013-05-27 | 2013-05-27 | Polyvinyl alcohol producing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320295571 CN203346316U (en) | 2013-05-27 | 2013-05-27 | Polyvinyl alcohol producing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203346316U true CN203346316U (en) | 2013-12-18 |
Family
ID=49746239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320295571 Expired - Lifetime CN203346316U (en) | 2013-05-27 | 2013-05-27 | Polyvinyl alcohol producing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203346316U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2013
- 2013-05-27 CN CN 201320295571 patent/CN203346316U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106084099B (en) * | 2016-08-17 | 2018-09-04 | 中国石化长城能源化工（宁夏）有限公司 | A kind of effective system and device for reducing polymerization energy consumption of rectification and improving operational stability |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131218 |