CN111826745A - Process and device for treating waste gel of ultra-high molecular weight polyethylene spinning - Google Patents
Process and device for treating waste gel of ultra-high molecular weight polyethylene spinning Download PDFInfo
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- CN111826745A CN111826745A CN202010749855.XA CN202010749855A CN111826745A CN 111826745 A CN111826745 A CN 111826745A CN 202010749855 A CN202010749855 A CN 202010749855A CN 111826745 A CN111826745 A CN 111826745A
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- 239000002699 waste material Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 title claims abstract description 30
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 title claims abstract description 30
- 238000009987 spinning Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims description 28
- 239000002904 solvent Substances 0.000 claims abstract description 78
- 235000015110 jellies Nutrition 0.000 claims abstract description 67
- 239000008274 jelly Substances 0.000 claims abstract description 67
- 238000001704 evaporation Methods 0.000 claims abstract description 62
- 230000008020 evaporation Effects 0.000 claims abstract description 59
- 239000007787 solid Substances 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 239000007790 solid phase Substances 0.000 claims abstract description 15
- 239000007791 liquid phase Substances 0.000 claims abstract description 9
- 238000005191 phase separation Methods 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000004064 recycling Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 238000003860 storage Methods 0.000 claims abstract description 6
- NNBZCPXTIHJBJL-UHFFFAOYSA-N decalin Chemical compound C1CCCC2CCCCC21 NNBZCPXTIHJBJL-UHFFFAOYSA-N 0.000 claims description 30
- 239000003292 glue Substances 0.000 claims description 30
- 238000011084 recovery Methods 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 12
- 239000011343 solid material Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 11
- 238000010298 pulverizing process Methods 0.000 claims description 11
- 239000012071 phase Substances 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 9
- CXWXQJXEFPUFDZ-UHFFFAOYSA-N tetralin Chemical compound C1=CC=C2CCCCC2=C1 CXWXQJXEFPUFDZ-UHFFFAOYSA-N 0.000 claims description 9
- PXXNTAGJWPJAGM-UHFFFAOYSA-N vertaline Natural products C1C2C=3C=C(OC)C(OC)=CC=3OC(C=C3)=CC=C3CCC(=O)OC1CC1N2CCCC1 PXXNTAGJWPJAGM-UHFFFAOYSA-N 0.000 claims description 8
- 238000000578 dry spinning Methods 0.000 claims description 7
- 239000000499 gel Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
- 238000007790 scraping Methods 0.000 claims description 4
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000008096 xylene Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000010992 reflux Methods 0.000 description 14
- 238000002844 melting Methods 0.000 description 12
- 230000008018 melting Effects 0.000 description 11
- 238000001035 drying Methods 0.000 description 10
- 238000001125 extrusion Methods 0.000 description 10
- 239000007788 liquid Substances 0.000 description 7
- 238000000926 separation method Methods 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 5
- 239000006096 absorbing agent Substances 0.000 description 5
- -1 polyethylene Polymers 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000001891 gel spinning Methods 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 3
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- 238000012986 modification Methods 0.000 description 2
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- 239000002994 raw material Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920010741 Ultra High Molecular Weight Polyethylene (UHMWPE) Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 239000002657 fibrous material Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
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Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
- D01F13/04—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like of synthetic polymers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The invention relates to a processing technique and a device of ultra-high molecular weight polyethylene spinning waste jelly, and the technique comprises the following steps: (1) extruding waste jelly formed by spinning ultrahigh molecular weight polyethylene to realize phase separation, crushing the obtained solid phase to obtain blocky solid, and collecting the obtained liquid phase solvent in a storage tank; (2) and (3) conveying the solid residue into an evaporation kettle, heating to remove the solvent, discharging the obtained steam, condensing and recycling to obtain the solvent, and discharging the residual solid residue. Compared with the prior art, the method has the advantages that waste materials generated in the spinning process of the ultra-high molecular weight polyethylene are properly treated, the recycling of the solvent is realized, and the production cost of the whole line is reduced.
Description
Technical Field
The invention belongs to the technical field of high polymer material processing waste, and relates to a process and a device for treating ultrahigh molecular weight polyethylene spinning waste jelly.
Background
The ultra-high molecular weight polyethylene (UHMWPE) fiber is a third generation high-performance fiber which appears after carbon fiber and aramid fiber, and is prepared by taking polyethylene with the relative molecular weight of more than 100 ten thousand as a raw material and performing gel spinning and super-drawing. The fiber has the highest specific strength and bulletproof performance in the current industrialized fiber materials, and the strength of the fiber is 15 times of that of a high-quality steel wire under the condition of the same weight. The UHMWPE fiber also has the characteristics of excellent chemical resistance and weather resistance, high energy absorption, low conductivity, X-ray permeability, certain waterproofness and the like. The excellent performance makes it have wide application prospect in the fields of military affairs, space flight and navigation engineering, high-performance and light composite materials, sports equipment and the like. If the body armor, bulletproof helmet, radar protection cover, missile cover, bulletproof armor, stab-resistant clothing and cutting-resistant gloves used as protective materials: large ship mooring ropes, parachute ropes, mine ropes, mountain climbing ropes and the like used as high-strength ropes: the composite material is manufactured and applied to a radome which is a buffer material attached to the inner wall of the tank, a large storage tank and the like; used as bowstring, canvas, sled, etc. of sports equipment, optical cable reinforcing material, fishing line, net, etc.
At present, the spinning technology of UHMWPE fibers is mainly gel spinning, which may be further divided into dry gel spinning and wet gel spinning. In any spinning route, a large amount of waste materials are inevitably generated during each starting and stopping, process matching or equipment debugging, and at present, for dry spinning, the main waste materials are UHMWPE waste jelly glue blocks or waste filaments containing solvent decalin; for wet spinning, the UHMWPE waste containing white oil. The characteristics of the UHMWPE production process result in high solvent content in the generated waste, particularly the content of decalin serving as a solvent in jelly blocks generated by dry spinning is more than 90 percent.
If the jelly glue blocks are treated as industrial waste, on one hand, the decalin belongs to an organic solvent with high price, and the direct treatment can cause a large amount of waste, thereby increasing the production cost; and decahydronaphthalene belongs to an extremely volatile, flammable and explosive organic solvent, and the treatment requirement and the cost of decahydronaphthalene are higher than those of common industrial wastes. Therefore, the method has important significance for recycling the waste jelly in actual production. Chinese patent CN 103628184A discloses a solvent recovery process for dry spinning waste silk, which uses a melting kettle to directly heat the waste silk, recover the solvent and treat the waste. The process has high energy consumption, and UHMWPE solid jelly blocks in the kettle can agglomerate after being melted, so that the difficulty of crushing and re-melting is increased; the CN 201110260728.4 patent introduces a method for recycling and re-spinning waste filaments of ultra-high molecular weight polyethylene jelly, which cuts the waste filaments into short fibers, mixes the short fibers into suspension, and re-spins the suspension, and does not mention the related technology of recycling volatile solvents.
Disclosure of Invention
The invention aims to provide a treatment process and a treatment device for ultra-high molecular weight polyethylene spinning waste jelly.
The purpose of the invention can be realized by the following technical scheme:
one of the technical schemes of the invention provides a treatment process of ultra-high molecular weight polyethylene spinning waste jelly, which comprises the following steps:
(1) extruding waste jelly formed by spinning ultrahigh molecular weight polyethylene to realize phase separation, crushing the obtained solid phase to obtain blocky solid, and collecting the obtained liquid phase solvent in a storage tank;
(2) and (3) conveying the solid residue into an evaporation kettle, heating to remove the solvent, discharging the obtained steam, condensing and recycling to obtain the solvent, and discharging the residual solid residue.
Further, the waste jelly glue is a block or a formed fiber tow formed by cooling the ultra-high molecular weight polyethylene spinning melt.
Furthermore, the mass content of the solvent in the waste jelly glue is more than or equal to 5 percent, and the temperature of the waste jelly glue is 0-160 ℃.
Further, the heating evaporation temperature in the evaporation kettle is controlled to be 60-140 ℃, and the pressure in the kettle is controlled to be 0.01-10 Kpa. The melting temperature of the waste jelly glue processed by the invention is about 150 ℃, and the liquid phase solvent can be evaporated and removed at the evaporation temperature lower than the melting point of the waste jelly glue by controlling the negative pressure condition in the evaporation kettle, and jelly glue blocks are continuously stirred and rolled, so that the melting agglomeration is avoided.
Further, the solvent is one or more of decahydronaphthalene, tetrahydronaphthalene or xylene.
The method for extruding the waste jelly glue comprises but is not limited to one or more of roller, flat plate, hinge and gear, the input jelly glue is extruded to realize two-phase separation of solvent and polyethylene, and the solvent in the extruded waste jelly glue is lower than that before extrusion. The granularity of the crushed material is smaller than that of the material before crushing.
The solid-liquid separation is realized simultaneously in the processes of extruding and crushing the waste jelly glue, and the equipment for realizing the solid-liquid separation can be not limited to one or more of a screen mesh, a vibrating sieve plate, an absorber and an ultrasonic separator.
The invention has the following effects in the treatment steps: extruding: the invention realizes instant phase separation by external force through the extrusion process, removes most of the solvent contained in the waste jelly glue, lightens the subsequent drying pressure and saves the energy consumption and the processing time. Crushing: after cutting up bold waste gel, improve stirring and drying efficiency, conveniently throw the material and the ejection of compact. After the surface of the waste jelly is dried, a porous structure can be formed, the heat transfer efficiency is greatly reduced, the waste jelly cannot be completely dried, the specific surface area of the chopped material is increased, and complete drying can be realized.
In the present invention, the temperature and pressure must be matched, and at a specific pressure, the process temperature must not be lower than the boiling point of the solvent, otherwise complete drying cannot be achieved. The higher the temperature, the higher the drying efficiency, but below the melting point of the jelly.
The second technical scheme of the invention provides an ultrahigh molecular weight polyethylene spinning waste gel treatment device, which comprises an extruder, a crushing and dicing cutter, an evaporation kettle and a solvent recovery mechanism, wherein the extruder is arranged above the crushing and dicing cutter, the solid phase outlet of the extruder is connected with the inlet of the crushing and dicing cutter, the bottom outlet of the crushing and dicing cutter is also connected with the material inlet of the evaporation kettle through a solid material conveying channel, and the solvent recovery mechanism is also connected with the top gas phase outlet of the evaporation kettle.
Furthermore, the crushing granulator is higher than the evaporation kettle, the solid material conveying channel comprises a vibration sieve plate which is arranged below an outlet at the bottom of the crushing granulator and is obliquely arranged, and the bottom end of the vibration sieve plate is connected with a material inlet of the evaporation kettle.
Furthermore, the evaporation kettle is a fully-sealed device, and stirring blades for stirring and scraping walls are arranged in the evaporation kettle.
Further, the solvent recovery mechanism comprises a tower body of which the bottom is connected with a top gas phase outlet of the evaporation kettle, and a solvent recovery unit arranged at the outlet end of the tower body.
Furthermore, the tower body is a steam pipeline, a plate tower or a packed tower with vacuum degree, and the solvent recovery unit is a condenser, an absorber or a membrane separator matched with the steam pipeline, the plate tower or the packed tower.
The invention physically extrudes most of the solvent in the jelly by using an extrusion device, after solid-liquid separation, the liquid part can be directly recovered without large energy consumption, and the solid part is cut up and then is subjected to heating flash evaporation and reduced pressure rectification to realize the complete drying of the jelly block. The recovered ultrahigh molecular weight polyethylene solid residue solvent has low residue, is convenient to treat, has small granularity, is beneficial to reprocessing, and can be used for the production of downstream products. The whole process of the process is closed, the waste materials generated in the spinning process of the ultra-high molecular weight polyethylene are properly treated, the recycling of the solvent is realized, and the production cost of the whole process is reduced.
Compared with the prior art, the treatment method has the advantages of simple process and high recovery efficiency, effectively solves the problems of wall adhesion, uneven heating, low recovery rate and the like easily caused by waste jelly treatment, and the processed jelly solid can be used for producing other polyethylene products such as fibers, diaphragms, granulation, pipe profiles and the like.
Drawings
FIG. 1 is a schematic flow diagram of the apparatus of the present invention;
the notation in the figure is:
1-waste jelly, 2-extruder, 3-crushing granulator, 4-vibrating sieve plate, 5-recovered solvent, 6-valve, 7-evaporation kettle, 8-slag discharge port, 9-reflux tower, 10-condenser and 11-vacuum system.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following embodiments or examples, unless otherwise specified, all the components or processing techniques that are conventional in the art for achieving the corresponding functions are shown.
The invention provides a treatment process of ultra-high molecular weight polyethylene spinning waste jelly, which is shown in a figure 1 and comprises the following steps:
(1) extruding the waste jelly glue 1 formed by spinning the ultra-high molecular weight polyethylene to realize phase separation, crushing the obtained solid phase to obtain a blocky solid, and collecting the obtained liquid phase solvent in a storage tank;
(2) the solid residue is sent into an evaporation kettle 7, the solvent is removed by heating, the obtained steam is discharged and condensed to recover the solvent, and the residual solid residue is discharged.
In a specific embodiment of the invention, the waste jelly glue 1 is a block (or a strip) or a formed fiber tow formed by cooling the ultra-high molecular weight polyethylene spinning melt.
In a specific embodiment of the invention, the mass content of the solvent in the waste jelly glue 1 is more than or equal to 5%, and the temperature of the waste jelly glue 1 is 0-160 ℃.
In a specific embodiment of the invention, the heating evaporation temperature in the evaporation kettle 7 is controlled to be 60-140 ℃, and the pressure in the kettle is controlled to be 0.01-10 Kpa. The melting temperature of the waste jelly glue processed by the invention is about 150 ℃, and the liquid phase solvent can be evaporated and separated at the evaporation temperature lower than the melting point of the waste jelly glue by controlling the negative pressure condition in the evaporation kettle, and jelly glue blocks are continuously stirred and rolled, so that the melting agglomeration is avoided.
In a specific embodiment of the present invention, the solvent is one or more of decahydronaphthalene, tetrahydronaphthalene, or xylene.
The method for extruding the waste jelly 1 comprises but is not limited to one or more of roller, flat plate, hinge and gear, the injected jelly is extruded to realize two-phase separation of the solvent and the polyethylene, and the solvent in the extruded waste jelly 1 is lower than that before extrusion. The granularity of the crushed material is smaller than that of the material before crushing.
The solid-liquid separation is realized simultaneously in the extrusion and crushing treatment processes of the waste jelly 1, and the equipment for realizing the solid-liquid separation can be not limited to one or more of a screen mesh, a vibrating sieve plate 4, an absorber and an ultrasonic separator.
The invention also provides an ultrahigh molecular weight polyethylene spinning waste gel treatment device, the structure of which is shown in figure 1, and the device comprises an extruder 2, a crushing and dicing cutter 3, an evaporation kettle 7 and a solvent recovery mechanism, wherein the extruder 2 is arranged above the crushing and dicing cutter 3, the solid phase outlet of the extruder 2 is connected with the inlet of the crushing and dicing cutter 3, the bottom outlet of the crushing and dicing cutter 3 is also connected with the material inlet of the evaporation kettle 7 through a solid material conveying channel, and the solvent recovery mechanism is also connected with the top gas phase outlet of the evaporation kettle 7.
In a specific embodiment of the present invention, the pulverizing and dicing cutter 3 is higher than the evaporation kettle 7, the solid material conveying channel includes a vibrating screen plate 4 which is obliquely installed below the bottom outlet of the pulverizing and dicing cutter 3, and the bottom end of the vibrating screen plate 4 is connected to the material inlet of the evaporation kettle 7.
In a specific embodiment of the present invention, the evaporation tank 7 is a fully sealed device, and a stirring blade for stirring and scraping walls is disposed in the tank. The evaporation kettle 7 can be horizontal or vertical, the outer wall of the kettle is provided with a slag discharge port 8 which can be opened, and the top of the kettle is provided with a reflux tower body 9 which can be used for refluxing solvent steam. The reflux tower body 9 can be a steam pipeline with vacuum degree, a plate tower or a packed tower, and the solvent recovery unit which is matched with the reflux tower body 9 and is used for recovering steam can be a condenser 10, an absorber or a membrane separator which is matched with the steam pipeline, the plate tower or the packed tower. The crushing granulator 3 comprises a shredding channel and two driving rollers, wherein the upper end and the lower end of the shredding channel are respectively connected with the extruder 2 and a solid material conveying channel, the two driving rollers are arranged in the shredding channel, the two driving rollers are arranged in parallel at intervals, a crushing and granulating gap is reserved, and a sawtooth structure is further arranged on the surfaces of the driving rollers. When the device works, the solid phase of the extruded waste jelly glue 1 is sent to the crushing and grain cutting gap, the waste jelly glue is further extruded and crushed by two driving rollers, and the obtained crushed block falls into the solid material conveying channel and is sent into the evaporation kettle 7.
The above embodiments may be implemented individually, or in any combination of two or more.
The above embodiments will be described in more detail with reference to specific examples.
Example 1:
the raw material to be processed in this embodiment is generally a melt after cooling and forming, and presents a block-shaped semi-solidified gel, which is poured into a hopper of the apparatus for processing.
With reference to the above embodiment and fig. 1, the present embodiment provides an ultrahigh molecular weight polyethylene dry spinning waste gel processing apparatus, the structure of which is shown in fig. 1, and the apparatus includes an extruder 2, a pulverizing granulator 3, an evaporation kettle 7, and a solvent recovery mechanism, wherein the extruder 2 is disposed above the pulverizing granulator 3, a solid phase outlet of the extruder 2 is connected to an inlet of the pulverizing granulator 3, a bottom outlet of the pulverizing granulator 3 is further connected to a material inlet of the evaporation kettle 7 through a solid material conveying channel, and the solvent recovery mechanism is further connected to a top gas phase outlet of the evaporation kettle 7.
Referring to fig. 1 again, the pulverizing and dicing cutter 3 is higher than the evaporation kettle 7, the solid material conveying channel includes a vibrating screen plate 4 which is obliquely installed below the bottom outlet of the pulverizing and dicing cutter 3, and the bottom end of the vibrating screen plate 4 is connected to the material inlet of the evaporation kettle 7.
Referring to fig. 1 again, the evaporation kettle 7 is a fully sealed device, and stirring blades for stirring and scraping walls are arranged in the kettle. The evaporation kettle 7 can be horizontal or vertical, the outer wall of the kettle is provided with a slag discharge port 8 which can be opened, and the top of the kettle is provided with a reflux tower body 9 which can be used for refluxing solvent steam. The reflux tower body 9 can be a steam pipeline with vacuum degree, a plate tower or a packed tower, and the solvent recovery unit which is matched with the reflux tower body 9 and is used for recovering steam can be a condenser 10, an absorber or a membrane separator which is matched with the steam pipeline, the plate tower or the packed tower. The vacuum degree in the reflux tower body 9 is formed by a vacuum system 11 arranged outside, so that the evaporated gas-phase solvent enters the reflux tower body 9 from the evaporation kettle 7. The heating evaporation temperature in the evaporation kettle 7 is controlled to be 60-140 ℃, and the pressure in the kettle is controlled to be 0.01-10 Kpa. The melting temperature of the waste jelly glue processed by the invention is about 150 ℃, and the liquid phase solvent can be evaporated and separated at the evaporation temperature lower than the melting point of the waste jelly glue by controlling the negative pressure condition in the evaporation kettle, and jelly glue blocks are continuously stirred and rolled, so that the melting agglomeration is avoided.
Crushing pelleter 3 in this embodiment includes that upper and lower both ends connect extruder 2 respectively with the shredding passageway of solid material transfer passage to and arrange two initiative gyro wheels in shredding the passageway, two parallel interval arrangements of initiative gyro wheel, and leave and smash the grain clearance of cutting, still be provided with sawtooth structure on the surface of initiative gyro wheel. When the device works, the solid phase of the extruded waste jelly glue 1 is sent to the crushing and grain cutting gap, the waste jelly glue is further extruded and crushed by two driving rollers, and the obtained crushed block falls into the solid material conveying channel and is sent into the evaporation kettle 7. In the invention, the extruded waste jelly is still a solid-liquid mixture containing a certain solvent, a part of solvent also exists on the surface of the waste jelly, and the solvent in the waste jelly is continuously extruded out in the process of sending to the subsequent crushing and grain cutting, and drops on the vibrating sieve plate 4 along with the crushed grains for phase separation.
During specific work, waste jelly 1 formed by ultra-high molecular weight polyethylene dry spinning is firstly sent into an extruder 2 for extrusion treatment, the obtained solid phase is sent into a crushing granulator 3 for crushing treatment, the obtained blocks after crushing treatment and the solvent separated in the whole extrusion crushing treatment process fall on a vibrating sieve plate 4 together, in the process of moving along the vibrating sieve plate 4, the liquid phase penetrates through sieve pores to fall into a recovery channel below the vibrating sieve plate 4 to obtain a recovered solvent 5, a valve 6 is arranged at the outlet of the recovery channel, and the recovered solvent is connected with a solvent storage tank through a pipeline. After the block is sent into an evaporation kettle 7 through a vibrating sieve plate 4, the block is heated and evaporated in the evaporation kettle 7, and the obtained evaporation solvent gas phase is discharged from a gas phase outlet at the top of the tower to a reflux tower body 9 of a solvent recovery mechanism for recovery.
Example 2:
the production process of the high-performance polyethylene fiber dry spinning has a period, when a spinning assembly is usually replaced during startup and shutdown, a large amount of high-temperature melt in a screw and in an assembly cavity can be discharged, the high-temperature melt is collected in a centralized manner and then naturally cooled to about 0-40 ℃ to obtain waste jelly glue 1, the melt is separated out from a spontaneous part to separate out a part of solvent, and the solvent residue in a solid phase is more than 80%.
The waste jelly 1 was processed by the apparatus of example 1, and as shown in FIG. 1, 100kg of a solid phase having a large volume and being agglomerated was taken out, fed into a hopper, extruded by an extruder 2, and pulverized by a pulverizer 3 to obtain a powder having a particle size of 3cm3The left and right pellets are all put into the evaporation kettle 7, and then the feeding valve 6 is closed.
Setting the vacuum degree of the system to be 0.1Kpa, heating the inner wall of the kettle to 90 ℃ by using an electric heater, heating and evaporating the solvent to form steam, and feeding the steam into a condenser 10 for condensation and collection through a reflux tower body 9. The evaporation kettle 7 uses an annular stirring paddle, and the condensation temperature is set to be 10 ℃. After the evaporation time is 3 hours, collecting 50kg of decahydronaphthalene; after 4h, the solid phase weight was unchanged and the solvent was completely evaporated after drying to yield 65kg of decalin. After the solvent obtained by separation after extrusion and crushing treatment is accumulated, the total recovery rate reaches 99 percent.
The VOCs detection equipment is used for testing tail gas on the surface of slag discharge, the residual amount of decalin is lower than 100ppm, and the solid residue discharged from the evaporation kettle 7 is soft light solid, so that the treatment and secondary utilization are convenient.
Example 3:
the method is substantially the same as that of the embodiment 2, except that a reflux tower body 9 with the theoretical plate number of 8 is arranged at the upper section of an evaporation kettle 7, condensed decahydronaphthalene is refluxed according to the ratio of not less than 5:5, the clarity of the recovered decahydronaphthalene is better than that of the direct condensation of the embodiment 1, and part of micro particles possibly floating in a gas phase can be removed. The purity of the collected decalin is more than 99.3 percent, and the decalin can be directly used for production again.
Example 4:
the procedure was as in example 2, except that the starting materialsProcessed by an extruder 2 and a crushing granulator 3 and cut into 1cm3The left and right granules are evaporated by heating the kettle wall with superheated steam, the quality of a solid phase is not reduced after 2 hours, and the content of a residue solvent is less than 50ppm, so that the granules can be treated as general waste.
Example 5:
substantially the same as in example 2, except that the solvent contained in the waste jelly 1 was tetralin, the solvent content before the treatment was 90%, the degree of vacuum in the evaporation vessel 7 was set to 0.05Kpa, and the inner wall of the evaporation vessel was heated by using a heat transfer oil coil at 100 ℃. After 2.5h, the recovery rate of the tetrahydronaphthalene reaches 98.5 percent, and the content of the residual solvent is less than 125 ppm.
Comparative example 1:
referring to example 2, the waste jelly 1 was treated without a pulverization and granulation step, and was directly charged into the evaporation vessel 7 in the form of large jelly pieces or flake jelly pieces. Uneven stirring and melt heating and rod climbing are caused in the implementation process, the stirring effect is not obvious in the later evaporation stage, obvious liquid phase components can be still observed in the kettle after drying for 12 hours, and the solvent cannot be thoroughly dried and recovered. The slag becomes hard after caking and is difficult to discharge from the slag discharge port 8.
Comparative example 2:
referring to example 2, the extrusion process was omitted in the treatment of the waste jelly 1, and the volume was about 3cm3The gel particles rich in a large amount of solvents are evaporated and dried by the same process, continuous heating is needed for 5 hours for complete drying, and compared with extrusion phase separation, the overall energy consumption and time cost are both improved by more than 30%, and the gel particles cannot be adopted on a large scale.
Comparative example 3:
the non-cooled melt (higher than 140 ℃) discharged by the screw is directly put into a hopper for solvent recovery, and the problems of insufficient rigidity of jelly glue, wall sticking of a roller and incapability of cutting during granulation are observed during implementation. A large amount of solvent volatilizes in the granulating process, the concentration of tail gas in a workshop is increased, and potential safety hazards exist. Part of the melt entering the evaporation kettle 7 has the phenomena of climbing poles, adherence and the like, and the drying is insufficient.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The processing technology of the spinning waste gel of the ultra-high molecular weight polyethylene is characterized by comprising the following steps:
(1) extruding waste jelly formed by spinning ultrahigh molecular weight polyethylene to realize phase separation, crushing the obtained solid phase to obtain blocky solid, and collecting the obtained liquid phase solvent in a storage tank;
(2) and (3) conveying the solid residue into an evaporation kettle, heating to remove the solvent, discharging the obtained steam, condensing and recycling to obtain the solvent, and discharging the residual solid residue.
2. The process of claim 1, wherein the waste jelly is a block or a formed fiber tow formed by cooling the melt of the ultra-high molecular weight polyethylene dry spinning.
3. The process of claim 1, wherein the solvent content in the waste jelly is not less than 5% by mass, and the temperature of the waste jelly is 0-160 ℃.
4. The process of claim 1, wherein the heating and evaporating temperature in the evaporator is controlled to be 60-140 ℃, and the pressure in the evaporator is controlled to be 0.01-10 Kpa.
5. The process of claim 1, wherein the solvent is one or more of decalin, tetralin or xylene.
6. The processing device for the ultra-high molecular weight polyethylene spinning waste jelly glue can implement the processing technology as claimed in any one of claims 1 to 5, and is characterized by comprising an extruder, a crushing granulator, an evaporation kettle and a solvent recovery mechanism, wherein the extruder is arranged above the crushing granulator, a solid phase outlet of the extruder is connected with an inlet of the crushing granulator, a bottom outlet of the crushing granulator is further connected with a material inlet of the evaporation kettle through a solid material conveying channel, and the solvent recovery mechanism is further connected with a top gas phase outlet of the evaporation kettle.
7. The apparatus as claimed in claim 6, wherein the pulverizing and cutting machine is higher than the evaporator, the solid material conveying passage comprises a vibrating screen plate which is obliquely arranged below the bottom outlet of the pulverizing and cutting machine, and the bottom end of the vibrating screen plate is connected with the material inlet of the evaporator.
8. The apparatus of claim 6, wherein the evaporator is a fully sealed apparatus, and the stirring blade is disposed in the evaporator for stirring and scraping the wall.
9. The apparatus as claimed in claim 6, wherein the solvent recovery mechanism comprises a tower body connected to the top gas phase outlet of the evaporation kettle at the bottom, and a solvent recovery unit disposed at the outlet end of the tower body.
10. The apparatus of claim 9, wherein the column is a vacuum steam pipe, a plate column or a packed column, and the solvent recovery unit is a condenser, an adsorber or a membrane separator associated with the steam pipe, the plate column or the packed column.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202247064U (en) * | 2011-09-19 | 2012-05-30 | 杭州翔盛高强纤维材料股份有限公司 | Residual oil recovery device of superhigh molecular weight polyethylene fibre gel waste silk |
| CN103541024A (en) * | 2013-10-11 | 2014-01-29 | 剑乔科技江苏有限公司 | Preparation method of high-concentrated ultra-high molecular weight polyethylene gel wire |
| CN103628184A (en) * | 2012-08-23 | 2014-03-12 | 中国石油化工股份有限公司 | Recovery processing method of ultrahigh molecular weight polyethylene dry spinning jelly and waste fiber solvent |
| JP2014129638A (en) * | 2007-03-27 | 2014-07-10 | Dsm Ip Assets Bv | Method for removing residual spinning solvent from gel spun filament, the filament, multifilament yarn and product including the filament |
| CN105002578A (en) * | 2015-05-19 | 2015-10-28 | 上海化工研究院 | Method for separating solid phases from solvent during ultrahigh molecular weight polyethylene dry spinning process |
-
2020
- 2020-07-30 CN CN202010749855.XA patent/CN111826745A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014129638A (en) * | 2007-03-27 | 2014-07-10 | Dsm Ip Assets Bv | Method for removing residual spinning solvent from gel spun filament, the filament, multifilament yarn and product including the filament |
| CN202247064U (en) * | 2011-09-19 | 2012-05-30 | 杭州翔盛高强纤维材料股份有限公司 | Residual oil recovery device of superhigh molecular weight polyethylene fibre gel waste silk |
| CN103628184A (en) * | 2012-08-23 | 2014-03-12 | 中国石油化工股份有限公司 | Recovery processing method of ultrahigh molecular weight polyethylene dry spinning jelly and waste fiber solvent |
| CN103541024A (en) * | 2013-10-11 | 2014-01-29 | 剑乔科技江苏有限公司 | Preparation method of high-concentrated ultra-high molecular weight polyethylene gel wire |
| CN105002578A (en) * | 2015-05-19 | 2015-10-28 | 上海化工研究院 | Method for separating solid phases from solvent during ultrahigh molecular weight polyethylene dry spinning process |
Non-Patent Citations (2)
| Title |
|---|
| 张凤翻等编著, 中国建材工业出版社 * |
| 赵莹 等主编: "超高分子量聚乙烯纤维的熔融纺丝", 《超高分子量聚乙烯纤维》 * |
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