CN209205310U - Falling film type devolatilizer and its falling liquid film element - Google Patents
Falling film type devolatilizer and its falling liquid film element Download PDFInfo
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- CN209205310U CN209205310U CN201820991410.0U CN201820991410U CN209205310U CN 209205310 U CN209205310 U CN 209205310U CN 201820991410 U CN201820991410 U CN 201820991410U CN 209205310 U CN209205310 U CN 209205310U
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Abstract
The utility model relates to falling film type devolatilizer and its falling liquid film elements, the bottom case being connected including the connected end socket of upright shell and the upper end with lower end, material cabinet and at least one falling liquid film element are equipped in devolatilizer, there are multiple falling liquid film runners on falling liquid film element, material box baseplate is cloth diaphragm plate, is that each falling liquid film runner is assigned film distribution structure on cloth diaphragm plate.This devolatilizer has many advantages, such as that film forming area is big, Film Morphology is controllable, flow adjustment range is wide, is suitable for the devolatilization processes such as high glutinous polymer production, spinning solution deaeration and solution concentration.
Description
Technical field
The utility model relates to one for fields such as the concentration of polymer production, spinning solution deaeration and solution, vacuum evaporation
Kind falling film type devolatilization equipment, the in particular to process units of polymer polycondensation reaction, belong to chemical production equipment field.
Background technique
In the chemical industry operations such as polycondensation, spinning solution deaeration and vacuum evaporation, desorption, small molecule compound is gradually removed
Mass-transfer efficiency is to control the key factor of devolatilization processes.Since this class process usually occurs in the glutinous system of height, thus system
The diffusion of small molecular compound is very difficult, the equipment inner member structure and material that devolatilization effect will receive for Flow of Goods and Materials
Flow the limitation of mixed characteristic.Need to develop a kind of devolatilization compact-sized, Surface Renewal frequency is fast, Mass and heat transfer is high-efficient
Device, to achieve the purpose that realize large capacity, high efficiency and high-quality devolatilization.
In the process for preparing polymer, melt polycondensation reaction is that one kind constantly generates the reversible of small molecule compound
Polymerization reaction, including polyethylene terephthalate (PET), polypropylene terephthalate (PTT), poly terephthalic acid
Polymerization including butanediol ester (PBT), polyethylene naphthalate (PEN), polyamide (PA66) and polycarbonate (PC) etc.
Object can be made by melt polycondensation reaction.It has to last for exclude generating small molecule compound when preparing this quasi polymer
Process for devolatilization is carried out with promoting to react constantly positive, and material stickiness is high, especially in polycondensation later period, material dynamic viscosity meeting
The variation of the order of magnitude occurs, this reaction is to be related to the change that chemical reaction is coupled with heat and mass to stick process.Therefore, melt polycondensation
Reaction effect depends on the flow behavior and Mass and heat transfer interfacial characteristics of devolatilization processes material.
The existing equipment for being successfully applied to high glutinous material devolatilization mainly has two class Horizontal type stirring device of disc type and cage frame formula.
These two types of equipment are to be immersed in the rotating machinery of melt layer by lower part that the melt in molten bath is taken up film forming when rotated is de-
It waves, this mode melt film forming efficiency is low, and Surface Renewal is limited, and especially when material viscosity is very big, material invests for a long time
On device inner member side reaction occurs, product quality is declined；In addition, the shaft of this kind of stirred reactor usually connects
It leads to outside shell, a large amount of high glutinous materials invest on blender and generate sizable degree of disturbing, and equipment sealing reliability is poor.Thus compel
A kind of efficient devolatilizer will be developed by being essential, and can make in device that material filming performance is good, Surface Renewal is fast, the residence time is uniform,
Flowing without dead zone, easy to clean, low energy consumption, and reaction process meet flowing, mixing and Mass and heat transfer demand, realize high-effect contracting
It is poly-.
Published vertical devolatilization reactor (a kind of tubulation extratubal falling film batch condensation polymerization reactor, CN102746499B；It is a kind of more
Layer fall tube type falling-film devolatilization reactor, CN105903424B), since belt stirrer, energy consumption do not decrease for it, film forming and
Surface Renewal can also meet certain quality of production requirement, but limited for the production material range of flow of adjusting, when increase object
When expecting treating capacity, the residence time is significantly reduced, product quality decline；And the umbrella skirt construction of multilayer material during falling liquid film is detached from
It is easy to cause directly to fall when full skirt and can not return to hollow pipe outer wall, formed so-called " short circuit ", so that devolatilization effect becomes
Difference and material viscosity it is irregular, meanwhile, multilayered structure also can gradually becoming larger because of material viscosity, be easy to cause in descending trays diameter
To generating apparent residence time difference when flowing, and then influence devolatilization effect.Therefore be badly in need of providing a kind of film forming area greatly, at
Film form is controllable, fast without dead zone, Surface Renewal, and the falling liquid film process dwell time is uniform controllable, the big devolatilization of range of flow adaptability
Equipment.
Utility model content
First purpose of the utility model is to provide a kind of falling film type devolatilization to overcome the above the deficiencies in the prior art
Device.For this purpose, the utility model uses following technical scheme:
Falling film type devolatilizer, including upright shell, be connected to the end socket of upright shell upper end and the bottom case of lower end, material into
Mouth, vacuum pumping opening, material outlet, it is characterised in that: material cabinet and at least one falling liquid film element, falling liquid film are equipped in devolatilizer
There are multiple falling liquid film runners, material inlet is connected with material cabinet, and the bottom plate of material cabinet is cloth diaphragm plate, cloth diaphragm plate on element
It is provided with film distribution structure, each falling liquid film runner is assigned identical film distribution structure.
Cloth fenestra is provided with as film distribution structure on cloth diaphragm plate for each falling liquid film runner of falling liquid film element.A kind of preferred structure
Be: the quantity of the corresponding cloth fenestra of each runner, size, relative position are identical.Material is through the cloth fenestra on cloth diaphragm plate point
After matching, into falling liquid film runner on form film evaporation device, while carrying out devolatilization, small molecule is taken away from vacuum suction mouth, and material is from drop
After membrane component slides, finally it is discharged from discharge port.
Further, the corresponding cloth fenestra of each runner is preferably one.
Specifically, falling liquid film element can be straight tube, be also possible to reality as the supporting element of Flow of Goods and Materials falling liquid film runner is provided
Axle.
Further, the cross section of falling liquid film element can be circle, be also possible to the shapes such as polygon.
Further, falling liquid film element periphery is evenly distributed with a plurality of axial limiting wall, and the falling liquid film runner is with falling liquid film member
The flaring runner that part outer wall is bottom, the adjacent two axial limiting walls of same falling liquid film element are side wall formation；Falling liquid film in devolatilizer
Element can also be evenly distributed with multiple axial inner concave shape grooves in periphery, and the falling liquid film runner is by axial inner concave shape groove table
The flaring runner that face is formed.
Further, at least provided with a crosspiece high up in the air between two axial limiting walls adjacent on falling liquid film element.
Further, devolatilizer has a heat transfer system and heat-insulation system, heat transfer system include falling liquid film element, heating agent flow into case,
Heating agent flows out case, and the inner and outer tubes of falling liquid film element flow into case with heating agent respectively, heating agent outflow case is connected and forms heat transfer system
Circulation path；Heat-insulation system includes upright shell and the respectively arranged shell collet of bottom case and bottom case collet, shell collet it is upper
Portion and lower part are respectively equipped with shell collet Heating medium and the outlet of shell collet heating agent, and the upper and lower part of bottom case collet is set respectively
There are bottom case collet Heating medium and the outlet of bottom case collet heating agent；The thermal medium of heat transfer system and heat-insulation system is passed to external warp
It crosses and rear circular flow is heated or cooled.
Preferably, falling liquid film element is cannula structure, the top and bottom of the inner tube of falling liquid film element are all open, falling liquid film member
Outer tube upper end opening, the lower end closed of part, so that it is logical so that the gap between the inside and inner tube and outer tube of inner tube is formed heating agent
Road.
Another purpose of the utility model is to provide a kind of falling film type devolatilization to overcome the above the deficiencies in the prior art
The falling liquid film element of device.For this purpose, the utility model uses following technical scheme:
A plurality of axial limiting wall is had on falling liquid film element, the axial limiting wall is circumferentially uniformly distributed along falling liquid film element, will
Falling liquid film element outer wall is separated into several falling liquid film runners.
Specifically, falling liquid film element can be straight tube, be also possible to reality as the supporting element of Flow of Goods and Materials falling liquid film runner is provided
Axle.
Further, the cross section of falling liquid film element can be circle, be also possible to the shapes such as polygon.
Further, on falling liquid film element between adjacent two axial limiting walls at least provided with a crosspiece high up in the air.
Further, the axial limiting wall quantity being distributed on each falling liquid film element is 2~20, and falling liquid film element circumscribed circle is straight
Diameter is 10~200mm, and falling liquid film element duration is 0.5~20m, and the height of axial limiting wall is 2~100mm.
Further, falling liquid film element is cannula structure, and the top and bottom of the inner tube of falling liquid film element are all open, falling liquid film member
Outer tube upper end opening, the lower end closed of part, so that the gap between the inside and inner tube and outer tube of falling liquid film inner tube be made to form heat
Matchmaker channel.
Further, falling liquid film element is formed by connecting by the falling liquid film component for having multistage coaxial from top to bottom, and each section from top to bottom
The circumscribed circle diameter of falling liquid film component becomes larger.
The utility model is to provide falling film type devolatilizer to overcome the above the deficiencies in the prior art there are one purpose
Another falling liquid film element.For this purpose, the utility model uses following technical scheme:
With multiple axial inner concave shape grooves on falling liquid film element, the axial direction inner concave shape groove is circumferentially uniform along falling liquid film element
Distribution, forms several falling liquid film runners.
Specifically, falling liquid film element can be tubulose, be also possible to reality as the supporting element of Flow of Goods and Materials falling liquid film runner is provided
Axle shape.
Further, the axial inner concave shape number of recesses being distributed on every falling liquid film element is 2~20, and falling liquid film element is external
Circular diameter is 20~300mm, and falling liquid film element duration is 0.5~20m, and the depth of axial inner concave shape groove is 2~100mm.
Further, the falling liquid film element that falling liquid film element has multistage coaxial from top to bottom is formed by connecting, from top to bottom each section of drop
The circumscribed circle diameter of membrane component becomes larger.
The utility model is designed by special falling liquid film component structure and its is combined with cloth diaphragm plate, and falling liquid film element outer wall is divided into
Several material film evaporation device regions have what can be constrained to be easy regulation at membrane interface, residence time of material and nowed forming.
Another effect of the utility model is so that material is on each runner uniform falling liquid film and can remain biggish always
Devolatilization area, also, the flaring shape runner on falling liquid film element not only increase devolatilization area and the work with extension film surface
With so that material film film surface ungauged regions in dropping process, the melt films residence time is uniform and mean residence time is extended
And be conducive to material and sufficiently react, to improve the devolatilization effect of small molecule compound；Meanwhile it being flared runner and making with water conservancy diversion
With, and be easier mutually to cooperate with vacuum suction condition and improve devolatilization effect；The drop of the provided parameter optimization of the utility model structure
Membrane component supports Flow of Goods and Materials, and material film forming can be made uniformly to be limited in controllable flow passage area always；Further, this is practical
The flowing velocity of material, stiffener can be reduced by being equipped with multiple crosspieces on novel falling film element between two adjacent axial limiting walls
The Surface Renewal of material keeps material mixing more uniform.
The devolatilizer of the utility model is easy to operate, compares previous extratubal falling film formula reactor, have can constrain at
Membrane interface, film forming area is big, Film Morphology is controllable, fast without dead zone, Surface Renewal, and the falling liquid film process dwell time is uniform controllable, can
To meet the material devolatilization of large capacity high-quality.
Detailed description of the invention
Fig. 1 is the devolatilizer structural schematic diagram of embodiment 1 provided by the utility model；
Fig. 2 is the devolatilizer structural schematic diagram of embodiment 4 provided by the utility model；
Fig. 3 is the falling liquid film element schematic of embodiment 1 provided by the utility model；
Fig. 4 is the falling liquid film element schematic of embodiment 3 provided by the utility model；
Fig. 5 is the falling liquid film element schematic of embodiment 5 provided by the utility model；
Fig. 6 is the falling liquid film element schematic of embodiment 6 provided by the utility model；
Fig. 7 is the devolatilizer structural schematic diagram of embodiment 8 provided by the utility model；
Fig. 8 is a kind of special-shaped tubular falling liquid film element schematic of inner concave shape groove provided by the utility model；
Fig. 9 is the falling liquid film element schematic of embodiment 8 provided by the utility model；
Figure 10 is the A-A cross-sectional view in Fig. 1.
Components, position and number in figure: Heating medium 1, feed pipe 2, heating agent flow into cabinet 3, and heating agent flows out cabinet
4, heating agent flows out box cover plate 41, and heating agent flows out cabinet lower plate 42, material cabinet 5, cloth diaphragm plate 51, cloth fenestra 511, shell
Collet Heating medium 6, upright shell 7, shell collet 8, bottom case flange 9, bottom case bolt 10, bottom case collet Heating medium 11, bottom
Shell 12, bottom case collet 13, material outlet 14, bottom case collet heating agent outlet 15, blender 16, shell collet heating agent outlet 17, drop
Membrane component 18, axial limiting wall 181, the inner tube 182 of falling liquid film element, the outer tube 183 of falling liquid film element, crosspiece 184, falling liquid film runner
18a, vacuum pumping opening 19, shell flange 20, casing bolts 21, heating agent outlet 22, end socket 23, material inlet 24.
Specific embodiment
Embodiment 1, referring to attached drawing 1, Fig. 3 and Figure 10；
A kind of falling film type devolatilizer provided by the present embodiment, as shown in Figure 1, including upright shell 7, being connected to vertical shell
The end socket 23 of 7 upper end of body and bottom case 12, material inlet 24, vacuum pumping opening 21, the material outlet 14 of lower end are equipped in devolatilizer
Material cabinet 5 and Duo Gen falling liquid film element 18 have multiple falling liquid film runner 18a, material inlet 24 and material cabinet 5 on falling liquid film element 18
It communicates, the bottom plate of material cabinet 5 is cloth diaphragm plate 51, and cloth diaphragm plate 51 is provided with film distribution structure, each falling liquid film runner 18a quilt
It is assigned film distribution structure.
18 peripheral distribution of falling liquid film element has a plurality of axial limiting wall 181, and falling liquid film runner 18a is to be with 18 outer wall of falling liquid film element
Bottom, the adjacent two axial limiting walls 181 of same falling liquid film element are the flaring runner that side wall is formed.
As shown in figure 3, the falling liquid film element 18 in the present embodiment is the straight tube for having internal and external casing, axial limiting wall 181 is used
Fin structure, axial limiting wall 181 are arranged in the centerline axis parallel of vertical direction and falling liquid film element 18, axial limiting wall 181
It is circumferentially uniformly distributed along falling liquid film element 18, the axial limiting wall quantity being distributed on every falling liquid film element 18 is 6, axial limiting wall
Length be 0.5~20m, be highly 2~100mm.
Falling liquid film element 18 with axial limited wall 181 is the constant straight tube of one section of diameter, outer diameter 80mm.
As shown in Figure 10, each falling liquid film runner 18a on falling liquid film element 18 is assigned a cloth fenestra 511.
Axial limiting wall 181 is located in the lower section of cloth diaphragm plate 51, close to cloth diaphragm plate 51, so that formed through cloth fenestra 511
Falling liquid film can timely enter runner as soon as possible, improve the effect of in flaring runner cloth film, extension.
Falling liquid film element duration is 0.5~20m, the outer wall spacing and axial limiting of adjacent two falling liquid film elements 18 in devolatilizer
The ratio between height of wall 181 is greater than 2.
The top and bottom of the inner tube 182 of falling liquid film element are all open, 183 upper end opening of outer tube of falling liquid film element, lower end
Closing, so that the gap between the inside and inner tube 182 and outer tube 183 of falling liquid film inner tube 182 be made to form channel.
Devolatilizer is equipped with heat transfer system, including heating agent flows into cabinet 3, heating agent outflow cabinet 4 and falling liquid film element 18 and its group
At circulation path, heating agent flow into cabinet 3 and heating agent outflow cabinet 4 on be respectively equipped with Heating medium 1 and heating agent outlet 22.
Devolatilizer is equipped with heat-insulation system, including respectively arranged 8 He of shell collet of upright shell 7 and bottom case 12 and its periphery
Bottom case collet 13, the upper and lower part of shell collet 8 are respectively equipped with shell collet Heating medium 6 and the outlet of shell collet heating agent
17, the upper and lower part of bottom case collet 13 is respectively equipped with bottom case collet Heating medium 11 and bottom case collet heating agent outlet 15.
The thermal medium of heat transfer system and heat-insulation system is passed to the external circular flow after being heated or cooled.
Cabinet 3, the devolatilizer top that heating agent outflow cabinet 4 and material cabinet 5 form and upright shell 7 is flowed by heating agent to lead to
It crosses shell flange 20 and casing bolts 21 connects, upright shell 7 is connected with bottom case 12 by bottom case flange 9 and bottom case bolt 10, just
In disassembly maintenance and installation.
Devolatilizer bottom case 12 is equipped with blender 16, and power is passed to by bottom.
Material is flowed into from the material inlet 24 being set on end socket 23, is flow in material cabinet 5 by feed pipe 2, through material
After cloth fenestra 511 on the cloth diaphragm plate 51 of 5 bottom of cabinet distributes, into falling liquid film runner 18a on form film evaporation device, carry out simultaneously
Devolatilization, small molecule are taken away from vacuum suction mouth 19, and material is after the landing of falling liquid film element 18, and agitated device 16 further homogenizes, most
It is discharged afterwards from material outlet 14.
The upper devolatilizer is used for the high glutinous polymer of falling liquid film melt polycondensation reaction preparation, is 0.65dL/g with intrinsic viscosity
Polyethylene terephthalate (PET) melt that molecular weight distributing index is 1.65 is raw material production high molecular weight PET；Using
Preferred structure scheme carries out PET melt polycondensation reaction, and the flow of every falling liquid film element 18 is 5kg/h, and it is glutinous to can get product property
Degree is 1.08dL/g, molecular weight distributing index 1.55.
Case study on implementation 2.
Using intrinsic viscosity be 0.65dL/g molecular weight distributing index be 1.65 PET melt as raw material, carry out devolatilization reaction
High molecular weight PET is produced, the flow of every falling liquid film element is 20kg/h, and other parts are same as Example 1, and it is special to can get product
Property viscosity be 1.01dL/g, molecular weight distributing index 1.53.
Case study on implementation 3.
As shown in figure 4, the falling liquid film element 18 with axial limited wall is the constant straight tube of one section of diameter, phase on falling liquid film element 18
The crosspiece 184 of equidistantly distributed is equipped between adjacent axial limiting wall 181, other parts are same as Example 1；Using preferred knot
Structure scheme, using intrinsic viscosity be 0.65dL/g molecular weight distributing index be 1.65 PET melt as raw material, carry out devolatilization reaction life
High molecular weight PET is produced, every falling liquid film element flow is 20kg/h, and acquisition product property viscosity is 1.02dL/g, molecular weight distribution
Index is 1.51.
Case study on implementation 4.
In the present embodiment, as shown in Fig. 2, the falling liquid film element outer tube 183 with axial limited wall 181 is using three sections be connected to
The coaxial straight tube of variable diameter, falling liquid film element outer tube 183, with equidistant interior variable diameter, drop below cloth diaphragm plate 51 from 51 lower section of cloth diaphragm plate to band
The bottom end of membrane component 18, caliber are respectively 70mm, 80mm, 90mm, and the other parts of the present embodiment are same as Example 1；With spy
Property viscosity be the PET melt that 0.65dL/g molecular weight distributing index is 1.65 be raw material, carry out devolatilization reaction production high molecular weight
PET, the flow of every falling liquid film element are 20kg/h, and acquisition product property viscosity is 1.05dL/g, and molecular weight distributing index is
1.52。
Embodiment 5
In the present embodiment, as shown in figure 5, the falling liquid film element of devolatilizer uses the regular hexagon with axial limiting wall special-shaped
The circumscribed circle diameter of pipe, regular hexagon is 80mm, and other parts are the same as embodiment 1；It is 0.65dL/g molecular weight point with intrinsic viscosity
The PET melt that cloth index is 1.65 is raw material, carries out devolatilization reaction production high molecular weight PET, and the flow of every falling liquid film element is
20kg/h, acquisition product property viscosity are 1.01dL/g, molecular weight distributing index 1.54.
Embodiment 6
In the present embodiment, as shown in fig. 6, the falling liquid film element of devolatilizer uses the quadrangle with inner concave shape groove special-shaped
The circumscribed circle diameter of pipe, quadrangle is 80mm, and depth of groove 20mm, other parts are the same as embodiment 1；It is with intrinsic viscosity
The PET melt that 0.65dL/g molecular weight distributing index is 1.65 is raw material, and progress devolatilization, which is reacted, produces high molecular weight PET, every
The flow of falling liquid film element is 20kg/h, and acquisition product property viscosity is 1.06dL/g, molecular weight distributing index 1.52.
Embodiment 7
In the present embodiment, it is 0.35dL/g with intrinsic viscosity that the number of fins being distributed on every falling liquid film element 18, which is 12,
The PET melt that molecular weight distributing index is 1.81 is raw material, the progress devolatilization reaction production higher PET material of molecular weight, every
The flow of falling liquid film element is 10kg/h, and other parts are same as Example 1；Acquisition product property viscosity is 0.73dL/g, molecule
Measuring profile exponent is 1.62.
Embodiment 8
A kind of falling film type devolatilizer provided by the present embodiment, as shown in fig. 7, comprises upright shell 7, is connected to vertical shell
The end socket 23 of 7 upper end of body and the bottom case 12 of lower end, material inlet 24 is equipped at the top of end socket 23, and 7 top of upright shell is equipped with vacuum
Bleeding point 19 and material cabinet 5, the bottom plate of material cabinet 5 are cloth diaphragm plate 51, are that each runner is assigned cloth film on cloth diaphragm plate 51
Hole 511.
Multiple falling liquid film elements 18 are equipped in devolatilizer, right angle setting, lower end is hanging, and 12 bottom of bottom case is equipped with material outlet
14。
Above-mentioned falling liquid film devolatilizer is applied to the deaeration of polyimides spinning solution.The falling liquid film element 18 of devolatilizer is using real
Axle structure, as shown in figure 9, equally distributed inner concave shape groove is falling liquid film runner 18a on 18 periphery of falling liquid film element.
18 circumscribed circle diameter of falling liquid film element is 120mm, trench depth 20mm, pipe range 10m.
It is flowed into containing bladdery polyimides spinning solution from the material inlet 24 being set on end socket 23, by feed pipe 2
It flow in material cabinet 5, after the cloth fenestra 511 on the cloth diaphragm plate 51 of 5 bottom of material cabinet distributes, into falling liquid film runner 18a
Upper formation film evaporation device, while devolatilization is carried out, the flow on each falling liquid film element 18 is 30kg/h, by escaping in polyimide solution
Small molecule compound bubble out is taken away from vacuum suction mouth 19, and polyimide solution is after the landing of falling liquid film element 18, from material
14 discharge of outlet, obtain bubble-free spins polyimides spinning solution.
Unit number same as Example 1 represents identical meaning in the present embodiment.
Reference examples 1.
Falling liquid film element in this reference examples using the constant Vertically tube of diameter as melt polycondensation reaction, melt is from slot
Shape cloth fenestra flows out to pipe outer wall face, carries out falling liquid film melt polycondensation reaction, remaining is the same as embodiment 1；Using above-described falling liquid film
Melt polycondensation reaction device carries out the melt polycondensation reaction of PET, and the flow on every falling liquid film element is 5kg/h, obtains the spy of product
Property viscosity be 0.94dL/g, molecular weight distributing index 1.60.
Reference examples 2.
Falling liquid film element in this reference examples using the constant Vertically tube of diameter as melt polycondensation reaction, melt is from slot
Shape cloth fenestra flows out to pipe outer wall face, carries out falling liquid film melt polycondensation reaction, remaining is the same as embodiment 1；Using above-described falling liquid film
Melt polycondensation reaction device carries out the melt polycondensation reaction of PET, and the flow on every falling liquid film element is 20kg/h, obtains the spy of product
Property viscosity be 0.81dL/g, molecular weight distributing index 1.59.
Reference examples 3
In this reference examples, the melt polycondensation reaction of PET is carried out using falling liquid film melt polycondensation reaction device described in same control 1,
Using intrinsic viscosity be 0.35dL/g molecular weight distributing index be 1.81 PET melt as raw material, carry out melt polycondensation reaction production
The higher PET material of molecular weight, the flow on every falling liquid film element are 10kg/h, and the intrinsic viscosity for obtaining product is 0.52dL/
G, molecular weight distributing index 1.69.
Embodiment 1 to 6 and reference examples 1 to 2 are compared, as shown in table 1, for the extratubal falling film of annular gap cloth film
For melt polycondensation reaction device (reference examples), the outer melt coating of pipe is incomplete, the melt films thickness ununiformity of film evaporation device, melt falling liquid film
Residence time is shorter, and it is slower to promote speed for PET intrinsic viscosity after reaction, and molecular weight of product distribution is obvious wider, when increase object
When stream amount, product characteristic viscosity is remarkably decreased；When using the reactor of the utility model, because of its falling liquid film element fin structure
Design is unique, and falling liquid film process is with that can constrain into membrane interface, and the area that forms a film is big, Film Morphology is controllable, without dead zone, Surface Renewal
Fastly, the falling liquid film process dwell time is uniform controllable, and the high-performance polyester industrial yarn for efficiently preparing high molecular weight, narrow ditribution may be implemented
Use material；More importantly it is high, narrow molecular weight distribution that the present apparatus still can get intrinsic viscosity when flow obviously increases
Product, this shows that adjustable processing materials range of flow is wide, is conducive to Large Copacity production.
The Comparison of experiment results of table 1 embodiment 1 to 6 and reference examples 1 and 2
Embodiment 7 and reference examples 3 are compared, as shown in table 2, using falling liquid film devolatilizer provided by the utility model and
Falling liquid film element carries out the devolatilization reaction of PET, it is known that when the intrinsic viscosity of charging is lower, can obtain extraordinary devolatilization effect
Fruit, and it is limited to use the intrinsic viscosity of obtained product when extratubal falling film formula reactor to increase, molecular weight of product distribution is also wider,
This shows that the utility model is suitable for producing the polyester material of different viscosity ranks.
The Comparison of experiment results of table 2 embodiment 7 and reference examples 3
The foregoing is merely the structure features of specific embodiment of the utility model, but the utility model to be not limited to
This, in the field of the utility model, made changes or modifications all cover practical new at this any those skilled in the art
Among the protection scope of type.
Claims (13)
1. falling film type devolatilizer, the bottom including upright shell (7), the end socket (23) and lower end that are connected to upright shell (7) upper end
Shell (12), material inlet (24), vacuum pumping opening (21), material outlet (14), it is characterised in that: body feed tank is equipped in devolatilizer
Body (5) and at least one falling liquid film element (18), there is multiple falling liquid film runners (18a) on falling liquid film element (18), material inlet (24) with
Material cabinet (5) is connected, and the bottom plate of material cabinet (5) is cloth diaphragm plate (51), and cloth diaphragm plate (51) is provided with film distribution structure, described
Each falling liquid film runner (18a) is assigned film distribution structure.
2. falling film type devolatilizer as described in claim 1, it is characterised in that: falling liquid film element (18) peripheral distribution has a plurality of axial direction
Limited wall (181), the falling liquid film runner (18a) are using falling liquid film element (18) outer wall as bottom, adjacent two axis of same falling liquid film element
It is the flaring runner that side wall is formed to limited wall (181).
3. falling film type devolatilizer as described in claim 1, it is characterised in that: falling liquid film element (18) peripheral distribution has multiple axial directions
Inner concave shape groove, the falling liquid film runner (18a) are the flaring runners formed by axial inner concave shape groove surfaces.
4. falling film type devolatilizer as described in claim 1, it is characterised in that: be the every of falling liquid film element (18) on cloth diaphragm plate (51)
A falling liquid film runner (18a) is at least provided with a cloth fenestra (511) as film distribution structure.
5. falling film type devolatilizer as claimed in claim 2, it is characterised in that: adjacent two axial limits on falling liquid film element (18)
At least provided with a crosspiece (184) high up in the air between position wall (181).
6. falling film type devolatilizer as claimed in claim 2 or claim 3, it is characterised in that: falling liquid film element (18) is cannula structure, falling liquid film
The top and bottom of the inner tube (182) of element are all open, outer tube (183) upper end opening, the lower end closed of falling liquid film element, thus
The gap between the inside and inner tube (182) and outer tube (183) of inner tube (182) is set to form channel.
7. the falling liquid film element of falling film type devolatilizer, it is characterised in that: there is a plurality of axial limiting wall (181) on falling liquid film element (18),
The axial limiting wall (181) is circumferentially distributed along falling liquid film element (18), and falling liquid film element (18) outer wall is separated into several falling liquid films
Runner (18a).
8. the falling liquid film element of falling film type devolatilizer as claimed in claim 7, it is characterised in that: falling liquid film element (18) upper adjacent two
At least provided with a crosspiece (184) high up in the air between axial limiting wall (181).
9. the falling liquid film element of falling film type devolatilizer as claimed in claim 7, it is characterised in that: divide on every falling liquid film element (18)
Axial limiting wall (181) quantity of cloth is 2~20, and falling liquid film element (18) circumscribed circle diameter is 10~200mm, falling liquid film element
(18) length is 0.5~20m, and the height of axial limiting wall (181) is 2~100mm.
10. the falling liquid film element of falling film type devolatilizer, it is characterised in that: have multiple axial inner concave shapes recessed on falling liquid film element (18)
Slot, the axial direction inner concave shape groove is circumferentially distributed along falling liquid film element (18), forms several falling liquid film runners (18a).
11. the falling liquid film element of falling film type devolatilizer as claimed in claim 10, it is characterised in that: on every falling liquid film element (18)
Axial inner concave shape groove (18b) quantity of distribution is 2~20, and falling liquid film element (18) circumscribed circle diameter is 20~300mm, falling liquid film
Element (18) length is 0.5~20m, and the depth of axial inner concave shape groove (18b) is 2~100mm.
12. the falling liquid film element of the falling film type devolatilizer as described in claim 7 or 10, it is characterised in that: falling liquid film element (18) is
The top and bottom of cannula structure, the inner tube (182) of falling liquid film element are all open, outer tube (183) upper end opening of falling liquid film element,
Lower end closed, so that it is logical to form the gap between the inside and inner tube (182) and outer tube (183) of falling liquid film inner tube (182)
Road.
13. the falling liquid film element of the falling film type devolatilizer as described in claim 7 or 10, it is characterised in that: falling liquid film element (18) from
The falling liquid film element for having multistage coaxial under is formed by connecting, and the circumscribed circle diameter of each section of falling liquid film element becomes larger from top to bottom.
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| CN110639461A (en) * | 2018-06-26 | 2020-01-03 | 浙江理工大学 | Falling film devolatilizer and falling film element thereof |
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Effective date of registration: 20210618 Address after: 310018 No. 928, No. 2 Avenue, Baiyang Street, Hangzhou Economic and Technological Development Zone, Hangzhou City, Zhejiang Province Patentee after: Zhejiang University of Technology Patentee after: Shanghai Yuejian Material Technology Co.,Ltd. Address before: No.928, No.2 street, Jianggan District, Hangzhou City, Zhejiang Province Patentee before: Zhejiang University of Technology |