CN102516510A - Dimple jacket-type prepolymerization vessel - Google Patents
Dimple jacket-type prepolymerization vessel Download PDFInfo
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- CN102516510A CN102516510A CN2011104332801A CN201110433280A CN102516510A CN 102516510 A CN102516510 A CN 102516510A CN 2011104332801 A CN2011104332801 A CN 2011104332801A CN 201110433280 A CN201110433280 A CN 201110433280A CN 102516510 A CN102516510 A CN 102516510A
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- cylindrical shell
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- short tube
- honeycomb
- chuck
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Abstract
The invention belongs to the technical field of chemical equipment, provides a dimple jacket-type prepolymerization vessel, and especially relates to a first polycondensation of oligomer in PET production. A main structure comprises an upper cylindrical shell and a lower cylindrical shell with different diameters and a jacket, and is characterized in that an outer wall of the cylindrical shell is welded with a cellular short tube. A heating cylindrical shell employs a welding structure of the cellular short tube and jacket; an upper end and a lower end of the jacket and the cellular short tube bottom are all welded on the outer wall of the cylindrical shell. According to different technological requirements, Square or rhombus distribution mode and axial direction and circumferential pitch of the cellular short tube can be selected, so as to realize economical and reasonable wall thickness of the cylindrical shell and the jacket. During the whole prepolymerization process, the material maintains a plug flow flowing state; the equipment has small volume; and the reactor as high efficiency.
Description
Technical field
The invention belongs to technical field of chemical, is a kind of honeycomb jacket formula precondensation still, specially refers to the polycondensation first time of oligopolymer in the PET production.
Background technology
The production of polyester is that esterification reaction raw material terepthaloyl moietie (EG) and terephthalic acid (PTA) are cooperated in the esterification reaction device in certain proportion; Suitable in addition temperature, pressure condition; Thereby keep the enough time to accomplish esterification reaction; Generate terephthalic acid terepthaloyl moietie vinegar (BHET), and then further the phthalic acid terepthaloyl moietie fat that generates is done polycondensation and handle, generate the polyethylene terephthalate.
Prepolymerization reaction requires under the high temperature about 290 ° of C, to carry out, and the precondensation still is to rely on high temperature heating agent in the chuck to heat up and be incubated.Owing to also have certain pressure in addition in the chuck, cause traditional precondensation still inner core housing wall thickness thicker like this.So not only equipment cost is higher, and energy loss is also comparatively serious.
Summary of the invention
The object of the present invention is to provide a kind of processing requirement that can satisfy in the production of polyester, can reduce the honeycomb jacket formula precondensation still of equipment cost again.
Precondensation still of the present invention is to send esterification step here oligopolymer, carries out the polycondensation first time, makes that the esterification yield of material reaches 99%～99.5%, the polymerization degree reaches n=15～28.
Main technical schemes of the present invention: honeycomb jacket formula precondensation still, agent structure comprises the upper and lower cylindrical shell and the chuck of different diameter, it is characterized in that being welded with on the cylinder body outer wall honeycomb short tube.
Usually, honeycomb jacket formula precondensation still agent structure of the present invention is upper and lower cylindrical shell, chuck and honeycomb short tube by different diameter, compositions such as vessel flange.The heating cylindrical shell adopts the welded construction of honeycomb short tube and chuck welding, and upper and lower end closing in place of chuck all is welded on the outer wall of cylindrical shell with honeycomb short tube bottom.According to the difference of processing requirement, can select honeycomb short tube square or rhombohedral distribution mode with axially and circumferential pitch, make cylindrical shell and chuck wall thickness economy and rationally.This structure is strengthened the inner barrel of heating cylindrical shell and the strength and stiffness of chuck each other, has enlarged the WP and the operating temperature range that are suitable for.
Obtain heat after the oligopolymer of injection additive gets into the precondensation well heater, along with the rising of temperature, the terepthaloyl moietie steam output increases, and under differential pressure action, material gets into precondensation still of the present invention.In the precondensation still, terepthaloyl moietie steam entrained liquids material rises, repeatedly a plurality of through the appropriate form slit, and further esterification and polycondensation also take place in the material thorough mixing, reach the gas-liquid separation section that material that reaction requires gets into the still top at last.Evaporating the water vapour that separates with liquid phase material in the precondensation still top gas-liquid separation section that bore enlarges with the terepthaloyl moietie steam; Isolated water vapour and terepthaloyl moietie steam get in the precondensation spray condenser through the gas phase pipeline; By cold cycle EG condensed and absorbed, the tail gas of incoagulability is extracted out by vacuum pump; The liquid phase material prepolymer gets into whole polycondensation vessel by the prepolymer pump delivery through the prepolymer strainer through transfer pipet.
Honeycomb jacket formula precondensation still of the present invention, rate of heat transfer is big, and vaporization efficiency is high, and in light weight, cost is low, and few, rational in infrastructure with heating agent or heating agent quantity of steam, helps reducing the long-time running cost of equipment.
The present invention compares with traditional Prepolycondensating reactor, has advantage:
From the intensity angle, honeycomb jacket equipment greatly reduces chuck wall thickness and inner core wall thickness, and manufacturing cost reduces; From the heat transfer angle; The gap of honeycomb jacket is littler than the gap of common chuck, and circulation area is less, and fluid flow velocity in the chamber significantly increases; And a large amount of honeycombs plays a part flow-disturbing spare in chuck; Fluid constantly changes flow direction and velocity of flow when flowing through cellular site, form turbulent eddy current heat (cold) exchange is quickened, and increases heat-transfer effect greatly; The precondensation process remains material plug flow flow state from bottom to top, and equipment volume is little, and reactor efficiency is high.
Description of drawings
Fig. 1 is the structural representation of embodiment of the invention honeycomb jacket formula precondensation still; Fig. 2 is a present embodiment welding node synoptic diagram.
Among the figure, 1-flat head; 2-following jacket head; 3-lower shell; 4-honeycomb short tube; 5-following chuck; 6-inner cone end socket; 7-chuck awl end socket; 8-ear seat; 9-upward lower flanges and skirt weldering sealed structure; 10-upward chucks; 11-upper shell; 12-upward jacket heads; 13-upper cover; 14-polycondensate vapour outlet; 15-pre-polymerization internals that contract.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in detail.
Embodiment:Present embodiment honeycomb jacket formula precondensation still, agent structure comprise the upper shell 11, lower shell 3 of different diameter and go up chuck 10, chuck 5 down, and its principal feature is all to be welded with honeycomb short tube 4 on the outer wall of upper shell 11, lower shell 3.
Shown in accompanying drawing 2, the welded construction that the heating cylindrical shell adopts honeycomb short tube 4 and last chuck 10, following chuck 5 to weld, upper and lower end closing in place of chuck all is welded on the outer wall of upper shell 11, lower shell 3 with honeycomb short tube 4 bottoms.According to the difference of processing requirement, can select honeycomb short tube 4 squares or rhombohedral distribution mode and axially reach circumferential pitch.
Among the embodiment, upper shell 11 also is provided with polycondensate vapour outlet 14, upper cover 13 and last jacket head 12; Lower shell 3 also is provided with ear seat 8, chuck awl end socket 7, inner cone end socket 6, following jacket head 2, flat head 1 and precondensation internals 15; Be connected through last lower flange and skirt weldering sealed structure 9 between upper shell 11 and the lower shell 3.
The honeycomb jacket formula precondensation still of present embodiment; Upper shell 11, lower shell 3 two portions by different diameter are formed: lower shell 3 conversion zones have designed the tower tray of different structure parameter; Upper shell 11 is the gas-liquid separation section; Adopt compound separation bubble-cap and leave bigger gas-phase space, polycondensate vapour outlet 14 is arranged at the top.The heating agent chuck of upper and lower cylindrical shell all adopts the honeycomb short tube jacket structured.Major diameter annular channel gas membrane does not have whipped-up structure makes Prepolycondensating reactor possess the function of completion later stage esterification and polycondensation in early stage, for pipeline adds properties-correcting agent assurance is provided, and reaction efficiency is high.
Claims (4)
1. honeycomb jacket formula precondensation still, agent structure comprises the upper and lower cylindrical shell and the chuck of different diameter, it is characterized in that being welded with on the cylinder body outer wall honeycomb short tube.
2. precondensation still as claimed in claim 1 is characterized in that closing in place of chuck upper and lower end and honeycomb short tube bottom all are welded on the outer wall of cylindrical shell.
3. according to claim 1 or claim 2 precondensation still is characterized in that the honeycomb short tube is square profile.
4. according to claim 1 or claim 2 precondensation still is characterized in that the distribution that assumes diamond in shape of honeycomb short tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110433280 CN102516510B (en) | 2011-12-22 | 2011-12-22 | Dimple jacket-type prepolymerization vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110433280 CN102516510B (en) | 2011-12-22 | 2011-12-22 | Dimple jacket-type prepolymerization vessel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102516510A true CN102516510A (en) | 2012-06-27 |
| CN102516510B CN102516510B (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110433280 Active CN102516510B (en) | 2011-12-22 | 2011-12-22 | Dimple jacket-type prepolymerization vessel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108404846A (en) * | 2018-05-28 | 2018-08-17 | 南京昊扬化工装备有限公司 | Novel precondensation kettle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2615626Y (en) * | 2003-05-20 | 2004-05-12 | 上海森松压力容器有限公司 | Heat exchange equipment jacket |
| CN102141355A (en) * | 2010-02-01 | 2011-08-03 | 张建东 | Honeycomb heating jacket for chemical vessel |
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2011
- 2011-12-22 CN CN 201110433280 patent/CN102516510B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2615626Y (en) * | 2003-05-20 | 2004-05-12 | 上海森松压力容器有限公司 | Heat exchange equipment jacket |
| CN102141355A (en) * | 2010-02-01 | 2011-08-03 | 张建东 | Honeycomb heating jacket for chemical vessel |
Non-Patent Citations (2)
| Title |
|---|
| 《石油化工设备技术》 20060715 张志芳 "关于夹套容器内筒加强结构的探讨" 第16-17，21页 1-4 第27卷, 第4期 * |
| 张志芳: ""关于夹套容器内筒加强结构的探讨"", 《石油化工设备技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108404846A (en) * | 2018-05-28 | 2018-08-17 | 南京昊扬化工装备有限公司 | Novel precondensation kettle |
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| CN102516510B (en) | 2013-04-17 |
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