CN1089270C - Latticed plate type polyester polycondensing tower - Google Patents
Latticed plate type polyester polycondensing tower Download PDFInfo
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- CN1089270C CN1089270C CN97121654A CN97121654A CN1089270C CN 1089270 C CN1089270 C CN 1089270C CN 97121654 A CN97121654 A CN 97121654A CN 97121654 A CN97121654 A CN 97121654A CN 1089270 C CN1089270 C CN 1089270C
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- tower
- polycondensation
- polyester
- screen
- angle bead
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Abstract
The present invention relates to a tower type reactor which is composed of an inner tower and an outer tower, wherein the outer tower is provided with a jacket, the top of the outer tower is provided with a steam outlet, and the tapered bottom of the outer tower is provided with a polymer outlet. The inner tower is composed of four wall boards, a plurality of layers of grid boards which are formed from parallel angle shafts are arranged in the inner tower, the angle shaft directions of the adjacent grid board layers are vertical, the layer distances of the grid board layers are gradually added from top to bottom, and gaps among the angle shafts are gradually widened. Materials orderly pass through the gaps among the angle shafts of the grid board layers to reduce a film, and steam converges to the steam outlet on the tower top through windows of the wall boards. The materials of the tower form piston flows, and have the advantages of large specific interface and good update. The present invention can improve the existing polyester melting polycondensation and can replace solid-phase polycondensation to produce high molecular weight polyester. The present invention can also be used for operation of devolatization of other chemical reactions or vacuum film evaporation, degasification (steam), etc.
Description
The present invention relates to a kind of chemical reactor, its available what need in time remove the chemical reaction process of volatility product and evaporation, degassing chemical engineering unit operations such as (vapour), is particularly suitable for high sticking system devolatilization, as the after-stage polycondensation of polyester.
Polyester comprises PET (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT) and poly-how dioctyl phthalate second diester (PEN) etc., the polycondensation process of each kind polyester has similar technological requirement, and existing PET polycondensation with the industry size maximum is that example describes.
The degree of polymerization of civilian fiber PET is about 100, and polycondensation process is generally finished by the series connection of 2-3 platform reactor, and wherein last reactor is called terminal polymerization kettle.The about 270-300 of terminal polymerization kettle running temperature ℃, the about 0.5-2mmhg of still internal pressure.
A desirable terminal polymerization kettle should satisfy following requirement:
A. have big, the material evaporating surface brought in constant renewal in the still promptly from sticky material, boiling off the ethylene glycol of generation, otherwise can thermal degradation take place, equipment capacity is reduced, the product quality deterioration because of the reaction time is long.
B. the still inner structure can make material keep plug flow, otherwise can produce the material back-mixing and reduce product quality.
C. the passage in the still can not have the dead angle.Condensation polymer is trapped in the meeting heat damage of place, dead angle for a long time, sneaks into quality is descended.D. the polycondensation vessel shaft at high temperature will have reliable vacuum seal structure to prevent that air from infiltrating, otherwise not only the degree of polymerization is carried not highly, and condensation polymer also can thermal oxidative degradation.Air infiltrates and can cause vacuum system to stop up in the still, and the equipment that influences turns round continuously.
E. the glycol entrainment condensation polymer amount that steams from polycondensation vessel will be lacked, and can not accumulate on the still wall.Carry the condensation polymer amount secretly and how can stop up vacuum system, accumulate in the meeting fouling of being heated for a long time on the wall, falling in the product to influence product quality.
F. to rationally solve thermal expansion of parts such as shaft, cylindrical shell at high temperature and the cooling problem that bearing, axle seal.
G. should satisfy the reaction requirement, simple in structure again, be convenient to make, install and maintenance.
(see Sun Jingmin etc. for details and write " polyester process " book).
The used terminal polymerization kettle of civilian in the world fiber PET production line is the horizontal retort that relies on the agitator membrane at present, agitator has disk and squirrel-cage two classes, and disc type is divided two kinds of single-shaft variant and biaxial types (see for details Bei Yulong, vehement the writing of Xu " polyester fiber handbook one book) again.
How exquisite no matter design and produce, these terminal polymerization kettles by the agitator membrane always can't be avoided following drawback:
1. always leave the gap between agitator outer rim and still inwall, have the viscous flow boundary layer at the bottom of the still, this place's residence time of material is long, even produces the dead angle.
2. built bridge by intensity and material and limit, adjacent discs (net) must keep big distance, and the devolatilization interface is very difficult further to increase.
3. the face on the disk (net) diminishes scarcely, becomes film coefficient low, and face upgrades not thorough.
4. there is radial symmetry gradient in the still.
5. Evacuable not stops, the waste discharge amount is big when driving.
6. the mechanical seal place air that may bleed becomes the hidden danger that influences product quality.
7. installation, maintenance is had relatively high expectations.
The about 160-200 of the degree of polymerization of industrial fibre PET, because of the viscosity height, agitator membrane difficulty, except that indivedual factories adopted melt polycondensation, most factories adopted solid phase polycondensation.The degree of polymerization of beverage bottle PET is 120-140, and aldehyde is lower than 2ppm, and the mode of agitator membrane can not meet the demands, and also need adopt solid phase polycondensation process to carry out aftercondensated.
The solid state polycondensation time is long, the flow process complexity, and equipment is huge, and investment, energy consumption and operating cost are all far above melt polycondensation.
The purpose of this invention is to provide the polycondensation tower that a kind of simple in structure, devolatilization interface is big and can upgrade rapidly, it can satisfy the polycondensation requirement of the polyester product of different polymerization degree, not only can improve existing polyester melt polycondensation situation, also can replace solid phase polycondensation, directly produce the high polymerization degree polyester product in the fusion mode, as PET industry silk, beverage bottle etc.It not only can be used for PET, also can be applicable to PTT, PBT, PEN etc.
Screen formula polycondensation tower structure of the present invention is as follows:
Grid tray tower is made up of Wai Ta and Nei Ta.Outer tower divides three sections of upper, middle and lower, all establishes chuck, respectively has a pair of or several to the heating agent import and export.Epimere is dish-shaped tower lid, and steam (vapor) outlet is offered at the top, and tower covers vertical section and dug four breach with tower bearing in holding, and two indentation, there chucks of diagonal position are offered hole, uses for feed pipe is installed, and this hole is sealed behind the tower feed pipe installation in position in treating again.Also need cut off this zone earlier before during maintenance interior tower crane being gone out, in shedding behind the tower feed pipe again folding remove tower lid (seeing accompanying drawing for details).The stage casing is straight tube tower body, and the bottom is provided with four positioning sliding blocks, limits the Nei Ta plan-position, allows to slide in vertical direction.At the bottom of hypomere was tower, its central authorities were a up big and down small awl bucket, and the polycondensation products outlet is established in awl bucket bottom.The elliptical ring sealing that the space is intercepted by an oblique plane between barrel and awl bucket at the bottom of the tower, elliptical ring lowest part have precipitum outlet in the steam.
Interior tower is made up of four wallboards, does not have the no end, top, and the cross section is a square, and the top of four inclines is provided with four bearings, is bearing on the upper flange of outer midsection.Be associated with the material distributing pipe between four bearings, two bearings of diagonal position have charging aperture, and feed pipe is installed from tower lid hole in outer Tata lid back in place.The multilayer screen is set in the interior tower, and screen is made up of the angle bead that is arranged in parallel, and angle bead is fixed on the inner tower wall plate.Wallboard has many wickets, and window shape is triangle and rectangle stack, the oriented internal groove in rectangle base.Angle bead is welded on window triangle two waists.Adjacent two screen layer angle bead orientations are vertical mutually, and the slit width degree increases gradually between each screen layer angle bead from top to bottom, and adjacent two screen interlamellar spacings strengthen gradually.Inner tower wall plate bottom is flanging inwardly, and the wallboard width is greater than outer tower base cone bucket porch diameter, and the terminal width of flanging squab panel is less than connecing the square length of side in the awl bucket inlet.
Consider pressure drop when giving polymers advances tower, first grid flaggy top is provided with flash zone, and enough evaporating spaces are provided.The inner tower wall plate outside is provided with electric heater, and inner tower wall plate window and outer tower steam outlet can be established mist eliminator.
Inner tower wall plate and angle bead material are stainless steel, and polishing reaches minute surface.Outer tower material is a carbon steel, but can adopt the carbon steel sheet of compound one deck stainless sheet steel with the material contact position.
In the tower multilayer crossbeam can be set in when making large-scale grid tray tower, each layer crossbeam is vertical mutually, and angle bead and upper strata beam vertical intersect, and is welded on vee two waists of their bottoms, angle bead is parallel with lower floor crossbeam direction, not only reduces the angle bead span but also do not influence low molecule product steam circulation.
Grid tray tower of the present invention is work like this when being used for polycondensation of polyester.
Before material advanced tower, vavuum pump was extracted into the technique initialization value with vacuum in the tower, and the chuck heating agent is heated to the technique initialization value with outer tower temperature, and the outer electric heater of inner tower wall plate is heated to the technique initialization value with interior tower temperature.
Material advances Nei Ta with stable volume flow, because two feed pipes charging simultaneously from diagonal position, any point is apart from equating apart from sum that two feed pipes enter the mouth in the material distributor pipe, material distributes comparatively even, cloth tube bottom slit width is specific curves and distributes, and guarantees that further charging is even.
First grid flaggy forms certain controlling level, material passes that the slit is membranaceous landing between angle bead, on next screen layer, stopped and cut apart by many angle beads vertical with face, form on the second screen layer material bed, pass falling liquid film to the three screen layers in slit between this layer angle bead again ... until the awl bucket of tower bottom outside last screen layer falls into, pump from the polymer outlet.Material landing process viscosity increases gradually, also increase gradually from top to bottom of slit width degree between angle bead in each screen layer, thus guarantee the height of materials that each screen layer is set.Pass inner tower wall plate window after low molecule product steam is overflowed from material, upwards move the steam (vapor) outlet that converges to cat head along the arcuate gap between the inside and outside tower.Because of bow-shaped area is enough big, steam flow rate is lower, and the polymer of carrying secretly in the steam is regularly discharged from the precipitum outlet of outer tower bottom by gravitational settling.Inner tower wall plate width is greater than outer tower base cone bucket inlet diameter, and the terminal width of flanging squab panel guarantees that less than connecing the square length of side in the awl bucket polycondensation products is mixed mutually mutually with the steam precipitum.
It is identical with the Nei Ta temperature of charge to set in the outer tower chuck heat medium temperature, and is vacuum layer between the inside and outside tower, and heat transfer coefficient is very low, thus in the tower material be in adiabatci condition.
The polycondensation products degree of polymerization is by vacuum degree control in the tower.Material advances the corresponding lifting of the material bed height meeting of long-pending flow each the screen layer when certain amplitude increases and decreases of tower body, and part compensates the variation of material at dwell time in the tower.
Compare with existing melting polycondensation technology, the present invention has following advantage:
1. do not have flow blind angle, no back-mixing may.The difference of melt time of staying on same screen layer was just little originally, and to hundreds of layers of screen serial operation, melt is mobile very approaching desirable piston flow in tower through tens of.
2. be not subjected to the restriction of building bridge of intensity and material, angle bead is arranged very close, interior tower volume filling rate and be much higher than existing terminal polymerization kettle than the interface.
3. melt one deck screen of whenever flowing through all obtains once fully mixing, and face obtains once thoroughly to upgrade, and is better than existing terminal polymerization kettle.
4. low molecule product steam flow approach is reasonable, and flow velocity is low, resistance is little.Through effectively catching foam and sedimentation, go out seldom entrained polymer of tower steam, delay vacuum system and stop up.The polymer of sedimentation is discharged separately in the steam, does not sneak into product, and favourable quality improves.
5. reaction is in adiabatci condition, and interior tower arbitrary section thermograde is zero, and particle temperature experience in tower is identical arbitrarily, uniform in quality.
6. inside and outside tower does not have rigid connection, is properly solving the irregular problem of breathing that produces because of the unlike material expansion coefficient difference.
7. do not have a stirring, eliminated the bleed hidden danger of air of axle envelope place, guarantee product quality.
8. open, do not have substantially when stopping waste material.
9. simple in structure, cost is low, and operating maintenance is convenient.
Grid tray tower of the present invention provides high specific interfacial area, and whole melts all are in filminess in the tower, have eliminated the hydrostatic head influence, have suppressed back reaction, helps macromolecular chain and increases the favourable acetaldehyde that removes in the product.Use grid tray tower of the present invention directly to produce superior in quality industrial fiber and beverage polyester for bottle, than existing solid phase polycondensation process big actinomere investment-saving and operating cost at melt state.
Fig. 1 is a screen formula polycondensation of polyester tower structure schematic diagram of the present invention, Fig. 1-the 1st wherein, and front view, Fig. 1-2 are side views, Fig. 1-the 3rd, vertical view, 1-4 are cutaway views.Fig. 1-5 is 4 place's partial enlarged drawings, Fig. 1-the 6th, mouth of pipe list and critical piece list.Fig. 2 is still middle cross beam and a screen layout drawing in the Large Towers.
Embodiment 1, and civilian fiber PET final minification is poly-.
Structure and operation principle as described above, the high 5-20 millimeter of angle bead, wide 3-15 millimeter, slit width degree 0.5-12 millimeter between angle bead, screen interlamellar spacing 20-100 millimeter, 60-400 layer.
Structure and work as described above, the high 5-20 millimeter of angle bead, wide 3-15 millimeter, slit width degree 5-18 millimeter between angle bead, screen interlamellar spacing 30-150 millimeter, 60-400 layer.
Embodiment 3, the vacuum film evaporation.
Slit width degree, screen interlamellar spacing and the number of plies are determined by evaporation technology requirement and mother liquor character between angle bead geometry, angle bead.
Claims (10)
1, a kind of screen formula polycondensation of polyester tower, it is made up of inner tower and outside tower, and described outer tower is established chuck, and the tower lid is dish, and the top has low molecule product steam (vapor) outlet, and tower body is a cylinder, and central authorities are the awl bucket at the bottom of the tower, and the polymerizate outlet is established in the end; Tower is made up of four wallboards in described, there is not the no end, top, the multilayer screen is set in the tower, screen is made up of parallel angle bead, and adjacent two screen layer angle bead orientations are vertical mutually, and each screen is layer by layer apart from increasing gradually from top to bottom, angle bead break joint crack is widened gradually in the screen layer, wallboard has all multiwindows, is shaped as the stack of triangle and rectangle, and angle bead is welded on triangle two waists.
2, screen formula polycondensation of polyester tower according to claim 1 is characterized by that material passes slit falling liquid film between angle bead under the gravity effect, produces huge devolatilization interface.
3, screen formula polycondensation of polyester tower according to claim 2, it is vertical mutually to it is characterized by adjacent two screen layer angle bead, makes the abundant homogenizing of material, and face thoroughly upgrades.
4, screen formula polycondensation of polyester tower according to claim 1 is characterized by low molecule product steam and overflows the back from the interface by tower in the outflow of wallboard window, converges along arcuate gap between inside and outside tower with exporting to overhead vapours.
5, screen formula polycondensation of polyester tower according to claim 1 is characterized by vacuum heat-preserving between the inside and outside tower of the consistent also dependence with temperature of charge of control chuck heat medium temperature, realizes adiabatic process.
6, screen formula polycondensation of polyester tower according to claim 1, it is characterized by inner tower wall plate width greater than outer tower awl bucket inlet diameter, behind the inside flanging of wallboard, terminal width guarantees that less than connecing the square length of side in the awl bucket polycondensation product does not mix mutually mutually with the steam precipitum.
7, screen formula polycondensation of polyester tower according to claim 1, in the tower multilayer crossbeam is set in it is characterized by, each layer crossbeam is vertical mutually, angle bead and upper strata beam vertical intersect, be welded on vee two waists of their bottoms, angle bead is parallel with lower floor crossbeam direction, not only reduces the angle bead span but also do not influence low molecule product steam circulation.
8, screen formula polycondensation of polyester tower according to claim 1 is characterized by inner tower wall plate peripheral hardware electric heater.
9, screen formula polycondensation of polyester tower according to claim 1 is characterized by inner tower wall plate window and the overhead vapours exit is provided with mist eliminator.
10, according to the described screen formula of claim 1-9 polycondensation of polyester tower, the application in polycondensation of polyester or vacuum film evaporation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97121654A CN1089270C (en) | 1997-11-21 | 1997-11-21 | Latticed plate type polyester polycondensing tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97121654A CN1089270C (en) | 1997-11-21 | 1997-11-21 | Latticed plate type polyester polycondensing tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1199651A CN1199651A (en) | 1998-11-25 |
| CN1089270C true CN1089270C (en) | 2002-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97121654A Expired - Fee Related CN1089270C (en) | 1997-11-21 | 1997-11-21 | Latticed plate type polyester polycondensing tower |
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| Country | Link |
|---|---|
| CN (1) | CN1089270C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005044417A1 (en) * | 2003-11-06 | 2005-05-19 | Zhaoyan Liu | A Devolatilization Tower falling films through the grid gaps |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4726143B2 (en) | 2004-11-30 | 2011-07-20 | 旭化成ケミカルズ株式会社 | Manufacturing method and manufacturing apparatus of molded body |
| JP4143673B2 (en) * | 2004-12-20 | 2008-09-03 | 旭化成ケミカルズ株式会社 | Industrial continuous evaporator |
| CN100509910C (en) * | 2006-12-29 | 2009-07-08 | 中国石化仪征化纤股份有限公司 | Horizontal polyester solid phase polycondensation reaction device |
| CN101837276A (en) * | 2010-03-24 | 2010-09-22 | 华东理工大学 | Novel flow-field structurized falling film polycondensation reactor and application thereof |
| CN102527316A (en) * | 2010-12-28 | 2012-07-04 | 上海杰事杰新材料(集团)股份有限公司 | Umbrella falling film polycondensation reactor |
| CN105080463B (en) * | 2015-08-31 | 2017-10-31 | 中国石油天然气集团公司 | For the polycondensation reactor in the accomplished continuously or intermittently process units of production of polyester |
| CN110964181B (en) * | 2019-11-27 | 2022-03-15 | 仪征威英化纤有限公司 | Tackifying device for regenerated polyester melt and production method of regenerated fiber |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4591366A (en) * | 1984-06-08 | 1986-05-27 | Krupp-Koppers Gmbh | Method of subsequent treatment of sulfur gas from waste pyrolysis |
| DE4426876A1 (en) * | 1994-07-29 | 1996-02-01 | Steag Ag | Separator removes unwanted components from a fluid, especially a waste gas, with a |
| CN1131055A (en) * | 1994-12-30 | 1996-09-18 | 卡尔弗沙工业设备公司 | Reactor device for free-flowing and higher-viscosity media |
| CN1159959A (en) * | 1997-02-03 | 1997-09-24 | 刘兆彦 | Vertical polyester reactor |
-
1997
- 1997-11-21 CN CN97121654A patent/CN1089270C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4591366A (en) * | 1984-06-08 | 1986-05-27 | Krupp-Koppers Gmbh | Method of subsequent treatment of sulfur gas from waste pyrolysis |
| DE4426876A1 (en) * | 1994-07-29 | 1996-02-01 | Steag Ag | Separator removes unwanted components from a fluid, especially a waste gas, with a |
| CN1131055A (en) * | 1994-12-30 | 1996-09-18 | 卡尔弗沙工业设备公司 | Reactor device for free-flowing and higher-viscosity media |
| CN1159959A (en) * | 1997-02-03 | 1997-09-24 | 刘兆彦 | Vertical polyester reactor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005044417A1 (en) * | 2003-11-06 | 2005-05-19 | Zhaoyan Liu | A Devolatilization Tower falling films through the grid gaps |
| DE112004002124B4 (en) * | 2003-11-06 | 2010-11-11 | Zhaoyan Liu | Rieselfil degasser with gratings |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1199651A (en) | 1998-11-25 |
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Owner name: BEIJING YINGNUO WEIXUN POLYMERIZATION TECHNOLOGY Free format text: FORMER OWNER: LIU ZHAOYAN Effective date: 20070323 |
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Effective date of registration: 20070323 Address after: 100078 South Securities Building, South Third Ring Road, Beijing, Fengtai District, room 450 Patentee after: Beijing Innovation Polymerization Technology Co., Ltd. Address before: 100077 Beijing city Fengtai District District Xiluoyuan Huida apartment three block B room 2105 Patentee before: Liu Zhaoyan |
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