CN107029447A - A kind of nylon chips extraction equipment and production line - Google Patents
A kind of nylon chips extraction equipment and production line Download PDFInfo
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- CN107029447A CN107029447A CN201710388447.4A CN201710388447A CN107029447A CN 107029447 A CN107029447 A CN 107029447A CN 201710388447 A CN201710388447 A CN 201710388447A CN 107029447 A CN107029447 A CN 107029447A
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- nylon chips
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- 238000000605 extraction Methods 0.000 title claims abstract description 119
- 239000004677 Nylon Substances 0.000 title claims abstract description 49
- 229920001778 nylon Polymers 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000009434 installation Methods 0.000 claims abstract description 14
- 230000003068 static effect Effects 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims description 63
- 229920000728 polyester Polymers 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 21
- 238000001467 acupuncture Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 17
- -1 polypropylene Polymers 0.000 claims description 17
- 239000004743 Polypropylene Substances 0.000 claims description 16
- 229920001155 polypropylene Polymers 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 238000001704 evaporation Methods 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 7
- 238000003490 calendering Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 5
- 239000008188 pellet Substances 0.000 claims 1
- 238000005453 pelletization Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 description 38
- 238000001816 cooling Methods 0.000 description 29
- 238000009833 condensation Methods 0.000 description 22
- 230000005494 condensation Effects 0.000 description 22
- 239000000047 product Substances 0.000 description 17
- 239000007788 liquid Substances 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 14
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 14
- 238000001914 filtration Methods 0.000 description 14
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 238000004064 recycling Methods 0.000 description 6
- 229920002292 Nylon 6 Polymers 0.000 description 5
- 239000012467 final product Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 229920002302 Nylon 6,6 Polymers 0.000 description 4
- BTGRAWJCKBQKAO-UHFFFAOYSA-N adiponitrile Chemical compound N#CCCCCC#N BTGRAWJCKBQKAO-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 150000003384 small molecules Chemical class 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229920006012 semi-aromatic polyamide Polymers 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920004933 Terylene® Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920000344 molecularly imprinted polymer Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000066 reactive distillation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/02—Solvent extraction of solids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
- C08G69/14—Lactams
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
- C08G69/14—Lactams
- C08G69/16—Preparatory processes
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a kind of nylon chips extraction equipment and production line, belong to chemical field, including static mixer, evaporate reactor, tubular reactor, finished product reactor, screw extruder, pelleter, extraction equipment and drying device, head tank is arranged at the top of extraction tower, extraction tower top EGR is arranged on the extraction tower upper area, extraction tower bottom EGR and pure hot water water supply installation are arranged on extraction tower bottom, centrifugal separating device charging aperture is connected with extraction tower bottom, centrifugal separating device delivery port is connected with the water inlet of pure hot water water supply installation.The beneficial effects of the invention are as follows：Using baffle plate by extraction tower be divided into above and below two parts, reduce the exchange between the cleaning solution of top and the bottom, realize that cleaning level compares clearly two-stage cleaning, and cause nylon chips during the mobile bottom under top, due to the effect of baffle plate, reduce intermediate openings, improve the flow velocity of current, realize the cleaning of local larger efficiency.
Description
Technical field
The present invention relates to chemical field, more particularly to a kind of nylon chips extraction equipment and production line.
Background technology
Nylon material is widely used in spinning, injection and film product due to its unique performance advantage, and nylon-6 is by making
Carry out commodity production as initiation material with caprolactam, the technique typically comprise by caprolactam in VK pipes in air
Heated 12 to 24 hours under pressure, this technique productions goes out the nylon-6 product containing 7-10% caprolactams in the product.It is surplus
Remaining caprolactam was extracted by using 8~12 hours aqueous solution extraction technique, and then the product of extraction is dried 8 to 12 hours,
The desciccate containing 0.2 to 0.3% caprolactam is produced, although the technique is commercially available success, nylon-6
The purification of product is that the purification by liquid extraction improvement of nylon product is always influence nylon finished product the process adds sizable spending
The very crucial factor of quality.
Publication No. CN1538984A application for a patent for invention discloses a kind of production method of nylon 6, wherein containing master
The caprolactam of part and/or the feed stream of the prepolymer of nylon 6 and the ACN of secondary part is wanted to be added into multistage
Section reactive distillation column in, in tower feed stream by with steam stream be in adverse current in the way of flow.Although this patent is by reducing
The purification step of intermediate product, but its purity for finally giving nylon is in reduced levels, can influence nylon final product quality.
And for example CN1513016A application for a patent for invention discloses the method that one kind prepares nylon 6,6, by adiponitrile and
The reaction of hexamethylene diamine and water in counter-flow multi-level tower reactor, prepares polyamide (nylon 6,6 and single containing copolymerization
The nylon 6,6 of body).The adiponitrile is hydrolyzed by being reacted with the water of dissolving, the water be by with adiponitrile and later reaction
The flow direction of product keeps the steam of reverse flow to supply and supplement, then adiponitrile hydrolysate and hexamethylene diamine
It polymerize under the operating condition of tower and forms nylon 6,6 polyamide.But this patent do not introduce to extraction nylon chips it is water-soluble
The recovery of liquid and recycle.
For another example CN101768266A application for a patent for invention discloses a kind of preparation method of semi-aromatic nylon, including as follows
Step：(1) aliphatic diamine is well mixed with 2~10 times of water, is heated to 50~90 DEG C, aromatic series is added under agitation
Binary acid, until solution ph reaches 7.0~7.7, continues after stirring 1~5 hour, and being cooled to room temperature, to be further continued for stirring 1~5 small
When, it is standby that nylon salt is obtained after filtration drying；(2) obtained nylon salt and solvent are pressed into certain proportioning (0.5~3.0g/mL)
Polymeric kettle is added, 190~230 DEG C are warming up under inert gas shielding, it is 2.0~3.0MPa, 1~5 hour to keep pressure in kettle
After deflate, pressure in kettle was down to normal pressure in 1~5 hour, then heat to 210~270 DEG C continue react 1~5 hour, go out
Material obtains powdered semi-aromatic nylon product.But this patent is not introduced the recovery to extracting the nylon chips aqueous solution yet and followed
Ring is utilized.
The content of the invention
To overcome, nylon finished product impurity content present in prior art is high, second-rate, cleaning solution utilization rate is not high
The problems such as, the invention provides a kind of nylon chips extraction equipment, including head tank, extraction tower, extraction tower top EGR,
Extraction tower bottom EGR, pure hot water water supply installation and centrifugal separating device, the head tank are arranged on the extraction tower top
Portion, extraction tower top EGR is arranged on the extraction tower upper area, extraction tower bottom EGR and institute
State pure hot water water supply installation and be arranged on the extraction tower bottom, the centrifugal separating device charging aperture and extraction tower bottom phase
Even, the centrifugal separating device delivery port is connected with the water inlet of the pure hot water water supply installation.Nylon chips pass through extraction tower
Top EGR, extraction tower bottom EGR liquidate extraction twice, remove most small molecules polymerization of slice surface
Filter is equipped with thing, extraction tower top EGR and extraction tower bottom EGR, by filter to circulation
Molecular weight polymers in water are filtered, and are less than molecular weight polymers content of the recirculated water before extraction section is rinsed
0.005%, so as to realize the recycling of water.
Further, inwall is provided with the baffle plate tilted down in the middle part of the extraction tower, and the baffle plate is located at the extraction tower
Below top EGR, using baffle plate by extraction tower be divided into above and below two parts so that nylon chips are in extraction tower top and the bottom
The exchange between the cleaning solution of top and the bottom is reduced in other places in different cleaning environment, realizes that cleaning level compares clearly two-stage
Cleaning, and cause nylon chips during the mobile bottom under top, due to the effect of baffle plate, to subtract intermediate openings
It is small, the flow velocity of current is improved, the cleaning of local larger efficiency is realized.
Further, extraction tower top EGR includes the first delivery pump, the first filter and primary heater, institute
The first conveying pump intake is stated with being connected at the top of the extraction tower, first filter inlet is pumped out with the described first conveying
Mouth is connected, and the primary heater entrance is connected with first filter outlet, the primary heater outlet and the extraction
Take and be connected in the middle part of tower.
Further, first filter is provided with acupuncture filter material, by 40~80wt% polyester fiber and 20~
60wt% polypropylene fiber is obtained through acupuncture, calen-dering process.Using acupuncture filter material, mixed by polyester fiber and polypropylene fiber
Close, acupuncture makes mutually to wind between fiber, form the space structure based on polyester fiber, recycle the melting of polypropylene fiber,
Make it that polyester fiber crossover node to be fixed, so as to form firm three dimensions filtration.
Further, the porosity of the acupuncture filter material is 60~90%, and pore diameter is less than 0.3mm.
Further, the thickness of the acupuncture filter material is 0.5~1.5cm, and grammes per square metre is 100~300g/cm2。
Further, the polyester fiber is distributed in more than three kinds of cross fiber type in the range of 0.5~3D using fineness
Composition, wherein fineness are more than 1.5D polyester fiber quality accounting more than 50%, and the length of polyester fiber is 37~51mm.
Further, the polypropylene fiber fineness is 1-2D, preferably 2D；Length is 35-48mm, preferably 38mm.Using
The polyester fiber of different thicknesses is mixed by a certain percentage with polypropylene fiber, by needling process be designed into using polyester fiber as
The space structure of network skeleton, then by calen-dering process, polypropylene fiber melting is attached at the crossover node of polyester fiber, shape
Into the three dimensions filter frame of stabilized structure, the molecular weight polymers that can effectively prevent diameter from being more than 0.3mm pass through, realization pair
The filtering of recirculated water.
Further, extraction tower bottom EGR include secondary heater, the secondary heater entrance with it is described
Extraction tower is connected close to bottom sides, and the secondary heater outlet is connected with the extraction tower bottom.
Further, the pure hot water water supply installation includes hopper, the second delivery pump, the second filter, the hopper
Water inlet is connected with the centrifugal separating device delivery port, the hopper delivery port and the second delivery pump water inlet phase
Even, the second filter water inlet is connected with the delivery pump delivery port, the second filter delivery port and the extraction
Tower bottom is connected.Second filter use with the first filter identical structure and material, but its fibre fineness for using and
Pore diameter is respectively less than the first filter, and the fineness of preferred polyester fiber is distributed in more than three kinds in the range of 0.5~3D here
Cross fiber type composition, wherein fineness be less than 1.5D polyester fiber quality accounting more than 80%, the length of polyester fiber
It is 60~90% for 37~51mm, and the acupuncture filter material porosity, pore diameter is less than 0.1mm.Due to the first mistake
Filter and the second filter are respectively for front and rear extraction and recovery liquid, the content and diameter of its recovered liquid small molecular polymer twice
The characteristics of recovered liquid being in different conditions, extraction tower top EGR is that molecular weight polymers content is high, diameter compared with
Greatly, and molecular weight polymers diameter otherness it is larger, its diameter exceedes in more than 0.3mm molecular weight polymers quality accounting
60%, thus the target of the first filter be mainly realize to these diameters more than 0.3mm molecular weight polymers filtering；And extract
The characteristics of taking the recovered liquid in the EGR of tower bottom is then that molecular weight polymers content is relatively low, and diameter is smaller, and small point
The otherness of sub- polymer diameter is smaller, and boy of its diameter more than 0.1~0.3 divides polymer quality accounting more than 70%,
Therefore the target of the second filter then be realize to diameter more than 0.1mm molecular weight polymers filtering.
Further, the extraction tower bottom water inlet is provided with changeover valve.
The present invention a kind of nylon chips production line is also provided, from front to back successively include static mixer, evaporation reactor,
Tubular reactor, finished product reactor, screw extruder, pelleter, extraction equipment and drying device.
Further, the drying device includes continuous drying tower, star-like drawing mechanism, cooling feed bin successively from top to bottom,
The continuous drying tower top is provided with hot N2Drying system, the hot N2Drying system includes the first N2Filter, first circulation wind
Machine, the first N2Heater, the first N2Filter inlet is connected with the continuous drying top of tower, the first circulation blower fan
Entrance and the first N2Filter outlet is connected, the first N2Calorifier inlets are connected with the first circulation fan outlet,
First N2Heater outlet is dried with the connection and connected in the middle part of tower side wall.Pass through hot N2The moisture content of wet slice surface is taken away,
And pass through the first N2Filter removes N2In moisture content, reuse the first N2Heater is to N2Concurrent heating is carried out, is realized to hot N2Dry
N in system2Recycling.
Further, it is additionally provided with the second hot N on the continuous drying tower2Drying system, the 2nd N2Drying system includes the
One heat sink, the second heat sink, second circulation blower fan and the 2nd N2Heater, the first heat sink entrance with it is described
First circulation fan outlet is connected, and the second heat sink entrance is connected with first heat sink outlet, and described second
Circulating fan entrance is connected with the outlet of institute's the second heat sink of art, the 2nd N2Calorifier inlets and the second circulation blower fan
Outlet is connected, the 2nd N2Heater outlet is connected with the continuous drying tower bottom.Second hot N2Pass through two in drying system
Secondary cooling design, makes N2Temperature be reduced to below dew point, isolate N2In moisture content, then by heating make N2Temperature reach
140~160 DEG C, enter from continuous drying tower bottom, redrying is carried out to nylon chips.
Further, second heat sink is provided with condensation zone, and the condensation zone is led to by a plurality of condensation in bending
Road is constituted, every section of condensation passage by multistage condensation section composition, the angle between adjacent two sections of condensation sections is 30~
60°.By designing condensation zone, make N after cooling2Baffle plate with each section of condensation section in condensation zone is fully contacted, N2In water
Stay in and dew is formed on baffle plate, so as to realize N2With the separation of moisture content.
Further, the cooling feed bin is provided with N2Cooling system, the N2Cooling system includes the 2nd N2It is filter, cold
But blower fan and N2Cooler, the 2nd N2Filter inlet with it is described cooling feed bin at the top of be connected, the cooling blower entrance and
2nd N2Filter outlet is connected, the N2Cooler entrance is connected with cooling blower outlet, the N2Cooler goes out
Mouth is connected with the cooling bin bottom.By setting N on cooling feed bin2Cooling system, is not only realized to dry chip finished product
Cooling, and also achieve drying again to dry chip, further improve the quality of final finished.
Further, the first N2Provided with one layer of moisture content sorbing material in filter, using carbon fibre composite conduct
Skeleton, and in surface attachment activated carbon granule, the carbon fibre composite uses needling process, and its thickness is in 1cm-5cm, hole
The control of gap radius is controlled in 0.05-0.1mm in below 0.5mm, the wherein size of activated carbon granule, and it accounts for carbon fibre composite
Less than the 30% of gross mass, preferably 25%.
The present invention also provides a kind of production method using above-mentioned nylon chips production line, comprises the following steps：
Step one：By liquid caprolactam, initiator, delustering agent, stabilization agent and antioxidant in static mixer fully
Mixing, mixing temperature is 90~150 DEG C, and incorporation time is controlled in 1-3h；
Step 2：By well mixed composition successively through evaporating reactor and tubular reactor, slow heating makes combination
The temperature of thing progressively increases to more than 250 DEG C, controls between 250~270 DEG C, wherein the temperature of evaporation reactor for 260~
270 DEG C, the temperature of tubular reactor is 250~260 DEG C, and regulation controls the pressure for evaporating reactor and tubular reactor to be 2-
4bar, the reaction time is 3-5h；
Step 3：Pass through finished product reactor again, temperature control is at 230~250 DEG C, pressure 1-2bar, and time control is in 5-
7h, obtains nylon final product mix；
Step 4：Nylon final product mix is plastified through screw extruder and extruded, then is cut into nylon chips through pelleter；
Step 5：Nylon chips are extracted through extraction equipment again, are removed the low polymer in section, are made its low point
The content of sub- polymer is less than 0.03%, then processing is dried to wet section, obtains required nylon chips.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) nylon chips liquidate extraction twice by extraction tower top EGR, extraction tower bottom EGR, remove
It is equipped with most molecular weight polymers of slice surface, extraction tower top EGR and extraction tower bottom EGR
Molecular weight polymers in recirculated water are filtered by filter by filter, recirculated water is being rinsed extraction section
Preceding molecular weight polymers content is less than 0.005%, so as to realize the recycling of water；
(2) mixed, set by needling process by a certain percentage with polypropylene fiber using the polyester fiber of different thicknesses
The space structure using polyester fiber as network skeleton is counted into, then by calen-dering process, polypropylene fiber melting is attached on terylene fine
At the crossover node of dimension, the three dimensions filter frame of stabilized structure is formed, the small molecule that can effectively prevent diameter from being more than 0.3mm
Polymer passes through, and realizes the filtering to recirculated water；
(3) it is small in its recovered liquid because the first filter and the second filter are respectively for front and rear extraction and recovery liquid twice
The characteristics of content and diameter of Molecularly Imprinted Polymer are in the recovered liquid in different conditions, extraction tower top EGR is small point
Sub- polymer content is high, is relatively large in diameter, and the otherness of molecular weight polymers diameter is larger, and its diameter is in the small of more than 0.3mm
Molecule aggregation amount of substance accounting is more than 60%, therefore the target of the first filter is mainly realization to these diameters in more than 0.3mm
The filtering of molecular weight polymers；And be then molecular weight polymers content phase the characteristics of recovered liquid in the EGR of extraction tower bottom
To relatively low, diameter is smaller, and the otherness of molecular weight polymers diameter is smaller, boy segregation of its diameter more than 0.1~0.3
Compound quality accounting is more than 70%, therefore the target of the second filter is realized to diameter in more than 0.1mm molecular weight polymers
Filtering；
(4) hot N is passed through2The moisture content of wet slice surface is taken away, and passes through the first N2Filter removes N2In moisture content, then make
With the first N2Heater is to N2Concurrent heating is carried out, is realized to hot N2N in drying system2Recycling；
(5) second hot N2Designed in drying system by reducing temperature twice, make N2Temperature be reduced to below dew point, isolate
N2In moisture content, then by heating make N2Temperature reach 140~160 DEG C, from continuous drying tower bottom enter, to nylon chips
Carry out redrying；
(6) by designing condensation zone, N after cooling is made2Baffle plate with each section of condensation section in condensation zone is fully contacted,
N2In water stay in dew formed on baffle plate, so as to realize N2With the separation of moisture content；
(7) by setting N on cooling feed bin2Cooling system, not only realizes the cooling to dry chip finished product, Er Qieshi
Show drying again to dry chip, further improve the quality of final finished.
Brief description of the drawings
Fig. 1 is the present invention preferably production line structure chart；
Fig. 2 is the present invention preferably extraction equipment structure chart；
Fig. 3 is the present invention preferably drying device structure chart；
Fig. 4 is the present invention preferably condensation zone structure chart.
Embodiment
Below in conjunction with drawings and examples, the present invention will be described in further detail.It should be appreciated that described herein
Specific embodiment only to explain the present invention, is not intended to limit the present invention.
It is as shown in Figure 1 preferably production line structure chart of the invention, includes static mixer 1, evaporation successively from front to back
Reactor 2, tubular reactor 3, finished product reactor 4, screw extruder 5, pelleter 6, extraction equipment 7 and drying device 8, such as scheme
Shown in 2, the extraction equipment 7 includes head tank 11, extraction tower 12, extraction tower top EGR 13, the circulation of extraction tower bottom
Device 14, pure hot water water supply installation 15 and centrifugal separating device 16, the head tank 11 are arranged on the top of extraction tower 12, institute
State extraction tower top EGR 13 and be arranged on the upper area of extraction tower 12, extraction tower bottom EGR 14 and institute
State pure hot water water supply installation 15 and be arranged on the bottom of extraction tower 12, the charging aperture of centrifugal separating device 16 and the extraction tower
12 bottoms are connected, and the delivery port of centrifugal separating device 16 is connected with the water inlet of the pure hot water water supply installation 15.
Nylon chips liquidate extraction twice by extraction tower top EGR 13, extraction tower bottom EGR 14, go
Except most molecular weight polymers of slice surface, in extraction tower top EGR 13 and extraction tower bottom EGR 14
Filter is equipped with, the molecular weight polymers in recirculated water are filtered by filter, recirculated water is being rinsed extraction
The molecular weight polymers content before section is taken to be less than 0.005%, so as to realize the recycling of water.
As a preferred embodiment, the middle part inwall of extraction tower 12 is provided with the baffle plate 26 tilted down, institute
State baffle plate 26 and be located at the lower section of extraction tower top EGR 13, using baffle plate 26 by extraction tower 12 be divided into above and below two parts,
So that nylon chips are respectively at different cleaning environment in the top and the bottom of extraction tower 12, the friendship between the cleaning solution of top and the bottom is reduced
Change, realize that cleaning level compares clearly two-stage cleaning, and cause nylon chips during the mobile bottom under top,
Due to the effect of baffle plate, reduce intermediate openings, improve the flow velocity of current, realize the cleaning of local larger efficiency.
As a preferred embodiment, extraction tower top EGR 13 includes the first delivery pump 17, first
Filter 18 and primary heater 19, the entrance of the first delivery pump 17 are connected with the top of the extraction tower 12, and described the
The entrance of one filter 18 is connected with first delivery pump 18 outlet, the entrance of primary heater 19 and first filter
18 outlets are connected, and the outlet of primary heater 19 is connected with the middle part of extraction tower 12.
As a preferred embodiment, first filter 18 is provided with acupuncture filter material, by 40~
80wt% polyester fiber is obtained with 20~60wt% polypropylene fiber through acupuncture, calen-dering process.
Using acupuncture filter material, mixed, acupuncture makes mutually to wind between fiber, formed with polypropylene fiber by polyester fiber
Space structure based on polyester fiber, recycles the melting of polypropylene fiber, it is consolidated polyester fiber crossover node
It is fixed, so as to form firm three dimensions filtration.
As a preferred embodiment, by optimizing design to acupuncture filter material, its filter efficiency is improved,
The porosity of the acupuncture filter material is 60~90%, and pore diameter is less than 0.3mm.The thickness of the acupuncture filter material is
0.5~1.5cm, grammes per square metre is 100~300g/cm2.The polyester fiber is distributed in three kinds in the range of 0.5~3D using fineness
Cross fiber type composition above, wherein fineness are more than 1.5D polyester fiber quality accounting more than 50%, polyester fiber
Length is 37~51mm.The polypropylene fiber fineness is 1-2D, preferably 2D；Length is 35~48mm, preferably 38mm.
Mixed, be designed into by needling process by a certain percentage with polypropylene fiber using the polyester fiber of different thicknesses
Using polyester fiber as the space structure of network skeleton, then by calen-dering process, polypropylene fiber melting is set to be attached on polyester fiber
At crossover node, the three dimensions filter frame of stabilized structure is formed, the small molecule that can effectively prevent diameter from being more than 0.3mm polymerize
Thing passes through, and realizes the filtering to recirculated water.
As a preferred embodiment, extraction tower bottom EGR 14 includes secondary heater 21, it is described
The entrance of secondary heater 21 is connected with the extraction tower 12 close to bottom sides, the outlet of secondary heater 21 and the extraction
The bottom of tower 12 is connected.
As a preferred embodiment, the pure hot water water supply installation 15 include hopper 22, the second delivery pump 23,
Second filter 24, the water inlet of hopper 22 is connected with the delivery port of centrifugal separating device 16, and the hopper 22 goes out
The mouth of a river is connected with the water inlet of the second delivery pump 23, the water inlet of the second filter 24 and the water outlet of the second delivery pump 24
Mouth is connected, and the delivery port of the second filter 24 is connected with the bottom of extraction tower 12.
Second filter 24 using and the first filter identical structure and material, but its fibre fineness for using and hole
Gap diameter is respectively less than the first filter, and the fineness of preferred polyester fiber is distributed in more than three kinds in the range of 0.5~3D here
Cross fiber type is constituted, and wherein polyester fiber quality accounting of the fineness less than 1.5D is more than 80%, and the length of polyester fiber is
37~51mm, and the porosity of the acupuncture filter material is 60~90%, pore diameter is less than 0.1mm.Due to the first filtering
Device and the second filter are respectively for front and rear extraction and recovery liquid twice, and the content and diameter of its recovered liquid small molecular polymer are equal
In different conditions, it is that molecular weight polymers content is high the characteristics of recovered liquid in the EGR of extraction tower top, is relatively large in diameter,
And the otherness of molecular weight polymers diameter is larger, its diameter exceedes in more than 0.3mm molecular weight polymers quality accounting
60%, thus the target of the first filter be mainly realize to these diameters more than 0.3mm molecular weight polymers filtering；And extract
The characteristics of taking the recovered liquid in the EGR of tower bottom is then that molecular weight polymers content is relatively low, and diameter is smaller, and small point
The otherness of sub- polymer diameter is smaller, and boy of its diameter more than 0.1~0.3 divides polymer quality accounting more than 70%,
Therefore the target of the second filter then be realize to diameter more than 0.1mm molecular weight polymers filtering.
As a preferred embodiment, the bottom water inlet of extraction tower 12 is provided with changeover valve 25.
The present invention preferably drying device structure chart is illustrated in figure 3, the drying device 8 includes connecting from top to bottom successively
Continuous drying tower 31, star-like drawing mechanism 32, cooling feed bin 33, the continuous drying top of tower 31 is provided with hot N2Drying system 34,
The hot N2Drying system 34 includes the first N2Filter 37, first circulation blower fan 38, the first N2Heater 39, the first N2
The entrance of filter 37 is connected with the continuous drying top of tower 31, the entrance of first circulation blower fan 38 and the first N2Filtering
The outlet of device 37 connection, the first N2The entrance of heater 39 is connected with the first circulation blower fan 38 outlet, the first N2Heating
Device 39 is exported with being connected in the middle part of the side wall of connection drying tower 31.Pass through hot N2The moisture content of wet slice surface is taken away, and passes through
One N2Filter removes N2In moisture content, reuse the first N2Heater is to N2Concurrent heating is carried out, is realized to hot N2N in drying system2
Recycling.
As a preferred embodiment, being additionally provided with the second hot N on the continuous drying tower 312Drying system 35, institute
State the 2nd N2Drying system 35 includes the first heat sink 40, the second heat sink 41, the N of second circulation blower fan 46 and the 2nd2Heating
Device 42, the entrance of the first heat sink 40 is connected with the first circulation blower fan 38 outlet, and second heat sink 41 enters
Mouthful export and to be connected with first heat sink 40, the entrance of second circulation blower fan 46 is exported with institute the second heat sink of art 41
It is connected, the 2nd N2The entrance of heater 42 is connected with the second circulation blower fan 46 outlet, the 2nd N2Heater 42 is exported
It is connected with the continuous drying bottom of tower 31.Second hot N2Designed in drying system by reducing temperature twice, make N2Temperature be reduced to
Below dew point, N is isolated2In moisture content, then by heating make N2Temperature reach 140~160 DEG C, from continuous drying tower bottom
Into to nylon chips progress redrying.
As a preferred embodiment, second heat sink 41 is provided with condensation zone 47, the condensation zone 47
It is made up of a plurality of in the condensation passage 48 of bending, every section of condensation passage 48 is constituted by multistage condensation section 49, phase
Angle between adjacent two sections of condensation section 49 is 30~60 °.By designing condensation zone, make N after cooling2It is in condensation zone and each
The baffle plate of section condensation section is fully contacted, N2In water stay in dew formed on baffle plate, so as to realize N2With the separation of moisture content.
As a preferred embodiment, the cooling feed bin 33 is provided with N2Cooling system 36, the N2Cooling system
36 include the 2nd N2Filter 43, cooling blower 44 and N2Cooler 45, the 2nd N2The entrance of filter 43 is expected with the cooling
The top of storehouse 33 is connected, the entrance of cooling blower 44 and the 2nd N2The outlet of filter 43 is connected, the N2The entrance of cooler 45
It is connected with the cooling blower 44 outlet, the N2Cooler 45 is exported to be connected with cooling feed bin 33 bottom.By cold
But N is set on feed bin2Cooling system, not only realizes the cooling to dry chip finished product, and also achieve to dry chip again
Dry, further improve the quality of final finished.
As a preferred embodiment, the first N2Provided with one layer of moisture content sorbing material in filter 37, use
Carbon fibre composite is as skeleton, and in surface attachment activated carbon granule, and the carbon fibre composite uses needling process,
Its thickness in 1cm~5cm, pore radius control in below 0.5mm, wherein the size control of activated carbon granule 0.05~
0.1mm, it accounts for less than the 30% of carbon fibre composite gross mass, preferably 25%.
The present embodiment also provides a kind of production method using above-mentioned nylon chips production line, comprises the following steps：
Step one：By liquid caprolactam, initiator, delustering agent, stabilization agent and antioxidant in static mixer fully
Mixing, mixing temperature is 90~150 DEG C, and incorporation time is controlled in 1~3h；
Step 2：By well mixed composition successively through evaporating reactor and tubular reactor, slow heating makes combination
The temperature of thing progressively increases to more than 250 DEG C, controls between 250~270 DEG C, wherein the temperature of evaporation reactor for 260~
270 DEG C, the temperature of tubular reactor is 250~260 DEG C, and regulation controls the pressure for evaporating reactor and tubular reactor to be 2-
4bar, the reaction time is 3-5h；
Step 3：Pass through finished product reactor again, temperature control is at 230~250 DEG C, 1~2bar of pressure, and time control is 5
~7h, obtains nylon final product mix；
Step 4：Nylon final product mix is plastified through screw extruder and extruded, then is cut into nylon chips through pelleter；
Step 5：Nylon chips are extracted through extraction equipment again, are removed the low polymer in section, are made its low point
The content of sub- polymer is less than 0.03%, then processing is dried to wet section, obtains required nylon chips.
The preferred embodiments of the present invention have shown and described in described above, as previously described, it should be understood that not office of the invention
Be limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and available for various other combinations, modification and
Environment, and can be changed in invention contemplated scope described herein by the technology or knowledge of above-mentioned teaching or association area
It is dynamic., then all should be appended by the present invention and the change and change that those skilled in the art are carried out do not depart from the spirit and scope of the present invention
In scope of the claims.
Claims (10)
1. a kind of nylon chips extraction equipment, it is characterised in that including head tank, extraction tower, extraction tower top EGR, extraction
Tower bottom EGR, pure hot water water supply installation and centrifugal separating device are taken, the head tank is arranged at the top of the extraction tower,
Extraction tower top EGR is arranged on the extraction tower upper area, extraction tower bottom EGR and described pure
Hot water water supply installation is arranged on the extraction tower bottom, and the centrifugal separating device charging aperture is connected with the extraction tower bottom,
The centrifugal separating device delivery port is connected with the water inlet of the pure hot water water supply installation, is set in the middle part of the extraction tower on inwall
There is the baffle plate tilted down, the baffle plate is located at below the EGR of the extraction tower top.
2. a kind of nylon chips extraction equipment according to claim 1, it is characterised in that the extraction tower top circulation dress
Put including the first delivery pump, the first filter and primary heater, the first conveying pump intake and the extraction tower top
Portion is connected, and the filter inlet is connected with the described first conveying pump discharge, the primary heater entrance and first mistake
Filter outlets are connected, and the primary heater outlet in the middle part of the extraction tower with being connected.
3. a kind of nylon chips extraction equipment according to claim 2, it is characterised in that first filter is provided with
Acupuncture filter material, is obtained by 40~80wt% polyester fiber with 20~60wt% polypropylene fiber through acupuncture, calen-dering process.
4. a kind of nylon chips extraction equipment according to claim 3, it is characterised in that the hole of the acupuncture filter material
Gap rate is 60~90%, and pore diameter is less than 0.3mm.
5. a kind of nylon chips extraction equipment according to claim 4, it is characterised in that the thickness of the acupuncture filter material
Spend for 0.5~1.5cm, grammes per square metre is 100~300g/cm2。
6. a kind of nylon chips extraction equipment according to claim 5, it is characterised in that the polyester fiber uses fineness
More than three kinds of the cross fiber type composition being distributed in the range of 0.5~3D, wherein fineness is more than 1.5D polyester fiber quality
Accounting is more than 50%, and the length of polyester fiber is 37~51mm.
7. a kind of nylon chips extraction equipment according to claim 6, it is characterised in that the polypropylene fiber fineness is 1-
2D, preferably 2D；Length is 35-48mm, preferably 38mm.
8. a kind of nylon chips extraction equipment according to claim 2, it is characterised in that the extraction tower bottom circulation dress
Put including secondary heater, the secondary heater entrance is connected with the extraction tower close to bottom sides, second heating
Device is exported to be connected with the extraction tower bottom.
9. a kind of nylon chips extraction equipment according to claim 3, it is characterised in that the pure hot water water supply installation bag
Hopper, the second delivery pump, the second filter are included, the hopper water inlet is connected with the centrifugal separating device delivery port,
The hopper delivery port is connected with the second delivery pump water inlet, the second filter water inlet and the described second conveying
Pump out the mouth of a river to be connected, the second filter delivery port is connected with the extraction tower bottom.
10. a kind of nylon chips production line, including the extraction equipment as described in claim any one of 1-9, it is characterised in that from
Front to back also includes static mixer, evaporation reactor, tubular reactor, finished product reactor, screw extruder, pelletizing successively
Machine, drying device, the extraction equipment are arranged on the pellet device rear, and are located in front of the drying device.
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| CN201710388447.4A CN107029447A (en) | 2017-05-27 | 2017-05-27 | A kind of nylon chips extraction equipment and production line |
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|---|---|---|---|
| CN201710388447.4A CN107029447A (en) | 2017-05-27 | 2017-05-27 | A kind of nylon chips extraction equipment and production line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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