CN104017116A - Polyvinyl alcohol reaction device - Google Patents
Polyvinyl alcohol reaction device Download PDFInfo
- Publication number
- CN104017116A CN104017116A CN201410257611.4A CN201410257611A CN104017116A CN 104017116 A CN104017116 A CN 104017116A CN 201410257611 A CN201410257611 A CN 201410257611A CN 104017116 A CN104017116 A CN 104017116A
- Authority
- CN
- China
- Prior art keywords
- extruder
- screw
- twin
- communicated
- twin screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses a polyvinyl alcohol reaction device. The polyvinyl alcohol reaction device comprises a feedstock solution metering-charging pump, a twin-screw devolatilization extruder, a forced feeder A, an auxiliary solution metering-charging pump, a twin-screw high-speed extruder, a forced feeder B, a twin-screw reaction extruder and a vacuum system, wherein the feedstock solution metering-charging pump is communicated with the charging inlet of the twin-screw devolatilization extruder, the discharging outlet of the twin-screw devolatilization extruder is communicated with the charging inlet of the twin-screw high-speed extruder through the forced feeder A, the auxiliary solution metering-charging pump is communicated with the twin-screw high-speed extruder, the discharging outlet of the twin-screw high-speed extruder is communicated with the charging inlet of the twin-screw reaction extruder by the forced feeder B; and the vacuum system is communicated with the twin-screw devolatilization extruder. Due to the adoption of three twin-screw extruders disclosed by the invention, the polymerization reaction from PVAC (Polymer Vinyl Acetate) to PVA (Polyvinyl Alcohol), the concentration of the feed, uniform mixing of the reaction feed and final polymerization reaction are sequentially completed, and the polyvinyl alcohol reaction device has the advantages of short reaction time, high reaction efficiency and high quality of products, environment friendliness, wide range of application, low power consumption and the like.
Description
Technical field
The present invention relates to chemical production device technical field, especially a kind of polyvinyl alcohol reaction unit.
Background technology
Polyvinyl alcohol (being called for short PVA) is that the minority of finding is at present dissolvable in water one of high molecular polymer of water; it can be by natural microbiological deterioration; it is a kind of high molecular polymer of very environmental protection; in addition it also has the features such as nontoxic, harmless, is therefore widely used in the aspects such as oil field, weaving, dyestuff, coating, tackiness agent, emulsifying agent, paper conversion auxiliary agent, film.Main purposes has: the coagulant aids of disposing polluted water in oil; Industrial phenolic aldehyde waste water treatment agent; Wholly-degradable agricultural film; Soil improvement agent, has good improved effect to saltings; Aircraft, high-grade car, the best base material of shatter proof glass for building; Medical treatment detection functional electrode; The packing film of food, medicine equipment, herbal medicine; Industrial semi-permeable membranes, can make solvent by and solute can not pass through, play the effect that separates solvent solute; Super absorbent resin; Printing photosensitive resin; Various industrial textiless, as canvas, filter cloth, wrapping material, fishing net, offshore operation hawser etc.
Industrial, PVA is made by Vinyl Acetate Copolymer (being called for short PVAc) alcoholysis under alkaline solution condition.Traditional PVAc belt-type alkaline solution alcoholysis device has that reactant residence time is long, equipment simple, simple operation and other advantages, but also has that speed of reaction is low, a fatal problem such as low conversion rate, alcoholysis degree distribute wide, alkali usage quantity large, it is large to pollute, resultant poor quality.
The disclosed patent document 201010543885.1 of China provides a kind of low alcoholysis level PVA continuous alcoholysis equipment, use twin screw extruder as reactor, have that speed of reaction is fast, reactant residence time is controlled, reactant residence time narrow distribution, can serialization production, the advantage such as low, the resultant alcoholysis degree narrowly distributing of alkali usage quantity, resultant stay in grade.This device Raw PVAc methanol solution and catalyst n aOH methanol solution use pre-reactor to mix, but the details of pre-reactor is not provided in the document.
In addition, the concentration of the PVAc methanol solution that domestic existing industrialization technology can directly obtain is at present generally only 15～30%, due to the concentration degree of bias, causes the problems such as downstream reaction efficiency is low.Therefore in order to enhance productivity, must concentrate raw material.The disclosed patent document 201010543885.1 of China is not mentioned this part content yet.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, propose a kind of polyvinyl alcohol reaction unit, rational in infrastructure, easy and simple to handle.
In order to realize foregoing invention object, the invention provides following technical scheme: a kind of polyvinyl alcohol reaction unit, comprise stock liquid metering feeding pump, twin screw devolatilization forcing machine, forced feed machine A, auxiliary material liquid metering feeding pump, twin screw high-speed extruder, forced feed machine B, double screw rod extruder and vacuum system, described stock liquid metering feeding pump is communicated with described twin screw devolatilization forcing machine feeding mouth, described twin screw devolatilization extruder discharging mouth is communicated with described twin screw high-speed extruder feeding mouth through described forced feed machine A, described auxiliary material liquid metering feeding pump is communicated with described twin screw high-speed extruder, described twin screw high-speed extruder discharge port is communicated with described double screw rod extruder feeding mouth through described forced feed machine B, described vacuum system is communicated with described twin screw devolatilization forcing machine.
Further, described twin screw devolatilization forcing machine is provided with the venting port that at least one is communicated with described vacuum system.
Further, the screw slenderness ratio of described twin screw devolatilization forcing machine is 20～80:1.
Further, the screw speed of described twin screw high-speed extruder is 300～1500 r/min; Screw slenderness ratio is 12～60:1.
Further, the screw slenderness ratio of described double screw rod extruder is 20～80:1.
Compared with prior art, the present invention has the following advantages: adopt three twin screw extruders to complete the polyreaction of PVAc to PVA, concentrated, the reaction material that complete successively raw material mix and final polyreaction, have that the reaction times is short, reaction efficiency is high, resultant quality is high, an environmental protection, applied widely, low power consumption and other advantages.
Brief description of the drawings
Fig. 1 is the structural representation of polyvinyl alcohol reaction unit of the present invention.
Embodiment
Describe the present invention below in conjunction with accompanying drawing, the description of this part is only exemplary and explanatory, should not have any restriction to protection scope of the present invention.
A kind of polyvinyl alcohol reaction unit as shown in Figure 1, comprise the methanol solution metering feeding pump 1 of Vinyl Acetate Copolymer, twin screw devolatilization forcing machine 2, forced feed machine A 3, NaOH solution measures fresh feed pump 4, twin screw high-speed extruder 5, forced feed machine B 6, double screw rod extruder 7 and vacuum system 8, the methanol solution metering feeding pump 1 of described Vinyl Acetate Copolymer is communicated with described twin screw devolatilization forcing machine 2 feeding mouths, described twin screw devolatilization forcing machine 2 discharge ports are communicated with described twin screw high-speed extruder 5 feeding mouths through described forced feed machine A 3, described NaOH solution measures fresh feed pump 4 is communicated with described twin screw high-speed extruder 5, described twin screw high-speed extruder 5 discharge ports are communicated with described double screw rod extruder 7 feeding mouths through described forced feed machine B 6, described vacuum system 8 is communicated with described twin screw devolatilization forcing machine 2.
First, the solubility of the PVAc methanol solution of industrial direct generation is generally 15～30%, in order to improve reaction efficiency, its concentration need to be brought up to 40～60%, and process using twin screw devolatilization forcing machine 2 provided by the invention completes this process.Twin screw devolatilization forcing machine has the advantages such as devolatilization efficiency is high, product stay in grade.
Use PVAc methanol solution metering feeding pump 1 that the PVAc methanol solution of concentration 30% is joined in twin screw devolatilization forcing machine 2.The feeding temperature of PVAc methanol solution is 50 DEG C; The screw diameter of twin screw devolatilization forcing machine 2 is 40mm, and length-to-diameter ratio is 44:1, is provided with 5 devolatilization mouths, and wherein said vacuum system 8 is communicated with 5 devolatilization mouths.30% PVAc methanol solution removes part methyl alcohol through twin screw devolatilization forcing machine 2, and concentration brings up to 45%.
Secondly, use forced feed machine A 3 that 45% PVAc methanol solution is transported in twin screw high-speed extruder 5, in twin screw high-speed extruder 5, add NaOH methanol solution through described NaOH solution measures fresh feed pump 4, the two forms mixing solutions in twin screw high-speed extruder 5 short mix simultaneously.The screw diameter of twin screw high-speed extruder 5 is 30mm, and length-to-diameter ratio is 24:1, screw speed 900 r/min.
Process using twin screw high-speed extruder provided by the invention completes the mixing of raw material PVAc methanol solution and catalyst n aOH methanol solution.Because the mixing of twin screw high-speed extruder is very capable, therefore can be by even two kinds of mixing of materials in 0.5～2 min, this is very favorable to subsequent reactions.
The 3rd, use forced feed machine B 6 that the mixing solutions of PVAc and NaOH is transported in double screw rod extruder 7, reaction generates PVA powder.The screw diameter of double screw rod extruder 7 is 30mm; Screw slenderness ratio is 48:1.The alcoholysis degree of PVA powder is 85～91% after tested.
Process using double screw rod extruder provided by the invention completes the polyreaction of PVAc to PVA.Double screw rod extruder has the advantages such as the ability of being uniformly mixed is strong, Surface Renewal is fast, reaction efficiency is high, operation residence time of material narrowly distributing, is particularly suitable for the reaction of the contour quality polymer of PVA.
In addition, it is low and easily reclaim that this device also has methyl alcohol usage quantity, and the advantage such as NaOH usage quantity is low, is a kind of novel environment friendly technique.
Claims (5)
1. a polyvinyl alcohol reaction unit, it is characterized in that: comprise stock liquid metering feeding pump, twin screw devolatilization forcing machine, forced feed machine A, auxiliary material liquid metering feeding pump, twin screw high-speed extruder, forced feed machine B, double screw rod extruder and vacuum system, described stock liquid metering feeding pump is communicated with described twin screw devolatilization forcing machine feeding mouth, described twin screw devolatilization extruder discharging mouth is communicated with described twin screw high-speed extruder feeding mouth through described forced feed machine A, described auxiliary material liquid metering feeding pump is communicated with described twin screw high-speed extruder, described twin screw high-speed extruder discharge port is communicated with described double screw rod extruder feeding mouth through described forced feed machine B, described vacuum system is communicated with described twin screw devolatilization forcing machine.
2. polyvinyl alcohol reaction unit as claimed in claim 1, is characterized in that: described twin screw devolatilization forcing machine is provided with the venting port that at least one is communicated with described vacuum system.
3. polyvinyl alcohol reaction unit as claimed in claim 1 or 2, is characterized in that: the screw slenderness ratio of described twin screw devolatilization forcing machine is 20～80:1.
4. polyvinyl alcohol reaction unit as claimed in claim 1, is characterized in that: the screw speed of described twin screw high-speed extruder is 300～1500 r/min; Screw slenderness ratio is 12～60:1.
5. polyvinyl alcohol reaction unit as claimed in claim 1, is characterized in that: the screw slenderness ratio of described double screw rod extruder is 20～80:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410257611.4A CN104017116A (en) | 2014-06-11 | 2014-06-11 | Polyvinyl alcohol reaction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410257611.4A CN104017116A (en) | 2014-06-11 | 2014-06-11 | Polyvinyl alcohol reaction device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104017116A true CN104017116A (en) | 2014-09-03 |
Family
ID=51434149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410257611.4A Pending CN104017116A (en) | 2014-06-11 | 2014-06-11 | Polyvinyl alcohol reaction device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104017116A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0942008A1 (en) * | 1998-03-11 | 1999-09-15 | Air Products And Chemicals, Inc. | A continuous process for the preparation of poly(vinyl acetate) for poly(vinyl alcohol) production |
| CN102127177A (en) * | 2010-11-11 | 2011-07-20 | 云南煤化工应用技术研究院 | Low-alcoholysis-degree polyvinyl acetate (PVA) continuous alcoholysis process |
| CN202016188U (en) * | 2010-12-08 | 2011-10-26 | 天华化工机械及自动化研究设计院 | Double-screw extruder unit for reaction extrusion of polyvinyl alcohol (PVA) |
-
2014
- 2014-06-11 CN CN201410257611.4A patent/CN104017116A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0942008A1 (en) * | 1998-03-11 | 1999-09-15 | Air Products And Chemicals, Inc. | A continuous process for the preparation of poly(vinyl acetate) for poly(vinyl alcohol) production |
| CN102127177A (en) * | 2010-11-11 | 2011-07-20 | 云南煤化工应用技术研究院 | Low-alcoholysis-degree polyvinyl acetate (PVA) continuous alcoholysis process |
| CN202016188U (en) * | 2010-12-08 | 2011-10-26 | 天华化工机械及自动化研究设计院 | Double-screw extruder unit for reaction extrusion of polyvinyl alcohol (PVA) |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103554314B (en) | Production method of high-purity polyvinyl alcohol | |
| CN202030868U (en) | Adding system for master batch used for spinning | |
| CN104558687B (en) | A kind of special spherical calcium carbonate of stone paper and preparation method thereof | |
| CN105566573B (en) | High fluidity metallocene ldpe resin graft and preparation method thereof | |
| CN102127177A (en) | Low-alcoholysis-degree polyvinyl acetate (PVA) continuous alcoholysis process | |
| CN104017116A (en) | Polyvinyl alcohol reaction device | |
| CN103665728A (en) | Modifier for regenerating and processing hybrid waste plastic injection part materials and usage method | |
| CN104707547A (en) | Method for synthesizing polyvinyl butyral by using micro reaction system | |
| CN207418432U (en) | A kind of processing unit for silicon wafer stripping waste water | |
| CN106007230A (en) | Treatment method for removing cellulose from papermaking wastewater | |
| CN100365033C (en) | Method for synthesizing high solid content vinyl acetate-ethylene copolymer emulsion | |
| CN101857391B (en) | Printing and dyeing sewage recycling method | |
| CN204079852U (en) | A kind of poly-unit of C5 petroleum resin | |
| CN202781482U (en) | Feeding device for screw machine | |
| CN202936339U (en) | Production system for polyvinyl alcohol aqueous solution | |
| CN103214739A (en) | Special material for automobile bumper and preparation method thereof | |
| CN202016188U (en) | Double-screw extruder unit for reaction extrusion of polyvinyl alcohol (PVA) | |
| CN203355727U (en) | Combination preparation device of photoinitiator | |
| CN207062171U (en) | A kind of device for the refining spearation of polymethoxy dimethyl ether containing formaldehyde | |
| CN112341553B (en) | Preparation method of low ash content fiber-grade polyvinyl alcohol | |
| CN201447440U (en) | Re-use device of terylene waste on polyester serial production line | |
| CN203346316U (en) | Polyvinyl alcohol producing system | |
| CN106674615A (en) | Preparation method of enhanced type polycaprolactone biodegradable plastics | |
| CN204211652U (en) | Heating-cooling device in aliphatic water reducing agent Preparation equipment | |
| CN203295414U (en) | Polyamide polymerization production equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140903 |
|
| RJ01 | Rejection of invention patent application after publication |