CN216320058U - Polyvinyl chloride stripping device - Google Patents
Polyvinyl chloride stripping device Download PDFInfo
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- CN216320058U CN216320058U CN202122388553.7U CN202122388553U CN216320058U CN 216320058 U CN216320058 U CN 216320058U CN 202122388553 U CN202122388553 U CN 202122388553U CN 216320058 U CN216320058 U CN 216320058U
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Abstract
The utility model discloses a polyvinyl chloride stripping device which comprises a stripping tower, wherein a cooler is arranged at the top of the stripping tower, the cooler is connected with a VCM (vinyl chloride monomer) recovery pipe, the stripping tower comprises an empty tower section and a plurality of tower plates, the tower plates are sequentially arranged below the empty tower section at intervals, a plurality of through holes are formed in the tower plates, an annular spraying device is arranged in the empty tower section, the spraying device is communicated with a spraying water pipe, the tower plate on the uppermost layer is an upper tower plate, the tower plate on the lowermost layer is a lower tower plate, the steam pipe is connected to the wall of the stripping tower below the lower tower plate, the wall of the stripping tower above the upper tower plate is connected with a slurry inlet pipe, and the bottom of the stripping tower is connected with a slurry outlet pipe. The device has the advantages of simple structure, convenient use and good effect.
Description
Technical Field
The utility model relates to the field of chemical industry, in particular to a polyvinyl chloride stripping device.
Background
In the production of polyvinyl chloride (PVC) resin, after suspension polymerization reaction is finished, vinyl chloride monomers adsorbed in the PVC resin need to be removed through a stripping device so as to meet the requirement of sanitary index. The general steam stripping device flow is that after PVC slurry enters a slurry tank to strip a large amount of unreacted monomers, the PVC slurry is pumped into a steam stripping tower through a slurry pump, and before cold slurry enters the steam stripping tower, the PVC slurry is firstly subjected to heat exchange with high-temperature hot slurry discharged from the steam stripping tower in a spiral plate type heat exchanger to heat up. And (3) after entering a stripping tower from the top, the slurry is in reverse contact with steam for heat and mass transfer, and the slurry stripped by removing the residual Vinyl Chloride Monomer (VCM) under the pumping of a vacuum pump enters a buffer tank for drying.
The through-flow sieve plate stripping device adopted in the prior industry generally has the following problems:
1. slurry enters from the top and is easy to form a wall built-up on the top of the stripping tower, the wall built-up material is easy to change color under the action of steam, and if the fluctuation of the stripping flow is too large, the wall built-up material falls off, so that the impurity particles in the quality index of the PVC resin are easy to exceed the standard;
2. PVC resin fine powder foam entrained in the VCM is recovered, and the fine powder enters a polymerization kettle for secondary polymerization to easily form a fish eye defect;
3. vacuum material is easy to appear in the stripping device, the stripping effect is affected, and the residual chloroethylene value of the product exceeds the standard.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: aiming at the problems in the prior art, the polyvinyl chloride stripping device is provided.
In order to achieve the purpose, the utility model adopts the technical scheme that:
the utility model provides a polyvinyl chloride strip device, includes the strip tower, the strip tower top is equipped with the cooler, the VCM recovery tube is connected to the cooler, the strip tower includes empty tower festival and a plurality of column plate, empty tower festival below interval sets gradually the column plate, be equipped with a plurality of through-holes on the column plate, be equipped with annular spray set in the empty tower festival, spray set intercommunication has spray header, the superiors the column plate is last column plate, lower floor the column plate is lower column plate, the column plate below down the strip tower wall connection has the steam pipe, it has thick liquids admission pipe to go up the column plate top the strip tower wall connection has thick liquids, the strip tower bottom is connected with thick liquids and goes out the tower pipe.
By adopting the polyvinyl chloride stripping device, PVC slurry enters the stripping tower through the slurry feeding tower pipe, a material layer which is uniformly distributed is formed on the tower plate and is fully contacted with steam entering the steam pipe, the stripping effect of the slurry is improved, the residual vinyl chloride content in a PVC resin product reaches the standard, a wall material is prevented from being formed at the top of the stripping tower, the phenomenon that foreign particles in PVC exceed the standard due to the falling of the wall material is prevented, atomized spray water is formed in the empty tower section through the spraying device, resin fine powder foam carried in VCM is washed, resin fine powder is prevented from being recycled, the system has the defects of vacuum material carrying and the like and the quality defect of the product, meanwhile, the blockage of the cooler is prevented, the cooling efficiency is improved, and the device has the advantages of simple structure, convenience in use and good effect.
The cooler is connected with a cooling water feeding pipe and a cooling water return pipe and is used for condensing steam after steam stripping.
Preferably, the distance between the tower plates is 100-500 mm.
Further preferably, the distance between the tower plates is 200-350 mm.
Preferably, the number of the trays is 15 to 50.
Further preferably, the number of the trays is 30 to 40.
Preferably, the aperture ratio of the tower plate is 6-15%.
More preferably, the aperture ratio of the tower plate is 8-12%.
Preferably, the aperture of the through hole is 6-15 mm.
Further preferably, the aperture of the through hole is 8-12.5 mm.
Preferably, the height of the empty tower sections accounts for 20-70% of the height of the stripping tower.
Further preferably, the height of the empty tower sections accounts for 35-55% of the height of the stripping tower.
Preferably, the cooler adopts a tubular heat exchanger.
Preferably, the cooler is flanged to the stripper.
Preferably, the condenser pipe of the cooler is communicated with the spraying device.
By adopting the structure, the condensed water of the steam from the steam stripping after being condensed by the cooler enters the spraying device to be used as the spraying and washing water of the steam stripping tower, so that the excessive consumption of the spraying water can be avoided, the water resource is saved, and the cost is reduced.
In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:
1. according to the polyvinyl chloride steam stripping device, PVC slurry enters the steam stripping tower through the slurry feeding tower pipe, a material layer which is uniformly distributed is formed on the tower plate and is fully contacted with steam entering the steam pipe, the steam stripping effect of the slurry is improved, the residual vinyl chloride content in a PVC resin product is guaranteed to reach the standard, a wall material is prevented from being formed at the top of the steam stripping tower, the phenomenon that foreign particles in PVC exceed the standard due to falling of the wall material is prevented, atomized spray water is formed in an empty tower section through the spraying device, resin fine powder foam carried in a VCM is washed, resin fine powder is prevented from being recycled, the system has the defects of vacuum material carrying and the like and the quality of the product, meanwhile, the cooler is prevented from being blocked, the cooling efficiency is improved, and the device is simple in structure, convenient to use and good in effect;
2. according to the polyvinyl chloride stripping device, condensed water obtained by condensing steam after stripping through the cooler enters the spraying device to be used as spraying washing water of the stripping tower, so that excessive spraying water consumption can be avoided, water resources are saved, and the cost is reduced.
Drawings
FIG. 1 is a schematic view showing the structure of a polyvinyl chloride stripping apparatus according to the present invention.
The labels in the figure are: 1-VCM recovery pipe, 2-cooling water return pipe, 3-cooling water feeding pipe, 4-slurry feeding pipe, 5-spray water pipe, 6-steam pipe, 7-slurry discharging pipe, 8-lower tower plate, 9-upper tower plate, 10-empty tower section, 11-cooler and 12-stripping tower.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Example 1
As shown in fig. 1, the polyvinyl chloride stripping apparatus according to the present invention includes a stripping tower 12, a cooler 11 is disposed at a top of the stripping tower 12, and the cooler 11 is connected to a VCM recovery pipe 1.
The stripping tower 12 comprises empty tower sections 10 and 15-50 tower plates, the number of the tower plates is preferably 36, the tower plates are sequentially arranged below the empty tower sections 10 at intervals, the distance between the tower plates is 100-500 mm, the embodiment is preferably 250mm, a plurality of through holes are formed in the tower plates, the aperture ratio of the tower plates is 6-15%, the embodiment is preferably 9%, the aperture of the through holes is 6-15 mm, the embodiment is preferably 11mm, the uppermost tower plate is an upper tower plate 9, the lowermost tower plate is a lower tower plate 8, the height of the empty tower sections 10 accounts for 20-70% of the height of the stripping tower 12, and the embodiment is preferably 42%.
An annular spraying device is arranged in the empty tower section 10, the spraying device is communicated with a spraying water pipe 5, the wall of the stripping tower 12 below the lower tower plate 8 is connected with a steam pipe 6, the wall of the stripping tower 12 above the upper tower plate 9 is connected with a slurry feeding tower pipe 4, and the bottom of the stripping tower 12 is connected with a slurry discharging tower pipe 7.
Cooler 11 adopts shell and tube heat exchanger, with stripping tower 12 flange joint, cooler 11 is connected with cooling water supply pipe 3 and cooling return pipe 2, cooler 11 is used for condensing the vapor after the steam stripping, cooler 11's condenser pipe intercommunication spray set.
Before the stripping device is started, after the device is washed clean, firstly, an outlet of a cooler 11 is opened to be communicated with a VCM recovery pipe 1, a cooling water feeding pipe 3 and a cooling water return pipe 2 of the cooler 11 are opened, a steam pipe 6 at the bottom of a tower is started to heat a stripping tower 12, after the temperature of the stripping tower 12 meets the requirement, a spray water pipe 5 is opened, slurry to be stripped is sent into the stripping tower 12 from a slurry inlet pipe 4, a uniformly distributed material layer is formed on a tower plate, after steam is fully contacted with the steam to remove chloroethylene, PVC slurry is sent into a drying system after shift heat exchange from a slurry outlet pipe 7, and the removed chloroethylene monomer is condensed by the cooler 11 connected with the top of the tower and then sent into the VCM recovery pipe 1 to a recovery system.
According to the polyvinyl chloride steam stripping device, PVC slurry enters the steam stripping tower 12 through the slurry inlet tower pipe 4, a material layer which is uniformly distributed is formed on the tower plate and is fully contacted with steam entering the steam pipe 6, the steam stripping effect of the slurry is improved, the content of residual vinyl chloride in a PVC resin product is guaranteed to reach the standard, a wall material is prevented from being formed at the top of the steam stripping tower 12, the phenomenon that foreign particles in PVC exceed the standard due to the falling of the wall material is prevented, atomized spray water is formed in the hollow tower section 10 through the spray device, resin fine powder foam carried in a VCM is washed, the resin fine powder is prevented from being recovered, the system has the defects of vacuum belt material and the quality of the product, meanwhile, the cooler 11 is prevented from being blocked, the cooling efficiency is improved, condensed water of steam after steam is condensed by the cooler 11 enters the spray device to be used as the spray washing water of the steam stripping tower 12, can avoid consuming too much shower water, the water economy resource, reduce cost, the device simple structure, convenient to use, respond well.
Example 2
The difference from example 1 is that in this example, the number of the trays is 33, the space between the trays is 200mm, the opening ratio of the trays is 9.5%, the hole diameter of the through hole is 10.5mm, and the height of the empty tower section 10 is 38% of the height of the stripping tower 12.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A polyvinyl chloride stripping device comprises a stripping tower (12), and is characterized in that a cooler (11) is arranged at the top of the stripping tower (12), the cooler (11) is connected with a VCM recovery pipe (1), the stripping tower (12) comprises an empty tower section (10) and a plurality of tower plates, the tower plates are arranged below the hollow tower sections (10) at intervals in sequence, a plurality of through holes are arranged on the tower plates, an annular spraying device is arranged in the hollow tower section (10), the spraying device is communicated with a spraying water pipe (5), the uppermost tower plate is an upper tower plate (9), the lowermost tower plate is a lower tower plate (8), a steam pipe (6) is connected with the wall of the stripping tower (12) below the lower tower plate (8), the wall of the stripping tower (12) above the upper tower plate (9) is connected with a slurry feeding tower pipe (4), and the bottom of the stripping tower (12) is connected with a slurry discharging tower pipe (7).
2. The polyvinyl chloride stripping device according to claim 1, wherein the distance between the trays is 100-500 mm.
3. The polyvinyl chloride stripping apparatus according to claim 1, wherein the number of the trays is 15 to 50.
4. The polyvinyl chloride stripping device according to claim 1, wherein the aperture ratio of the tower plate is 6-15%.
5. The polyvinyl chloride stripping device according to claim 1, wherein the aperture of the through hole is 6-15 mm.
6. Polyvinyl chloride stripping plant according to claim 1, characterized in that the height of the empty tower sections (10) amounts to 20-70% of the height of the stripping column (12).
7. Polyvinyl chloride stripping plant according to claim 1, characterized in that the cooler (11) employs a shell and tube heat exchanger.
8. Polyvinyl chloride stripping plant according to claim 1, characterized in that the cooler (11) is flanged to the stripping column (12).
9. Polyvinyl chloride stripping plant according to any one of claims 1 to 8, wherein the condenser of the cooler (11) communicates with the sprinkling means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122388553.7U CN216320058U (en) | 2021-09-30 | 2021-09-30 | Polyvinyl chloride stripping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122388553.7U CN216320058U (en) | 2021-09-30 | 2021-09-30 | Polyvinyl chloride stripping device |
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| Publication Number | Publication Date |
|---|---|
| CN216320058U true CN216320058U (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122388553.7U Active CN216320058U (en) | 2021-09-30 | 2021-09-30 | Polyvinyl chloride stripping device |
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| CN (1) | CN216320058U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114917609A (en) * | 2022-06-17 | 2022-08-19 | 唐山三友氯碱有限责任公司 | Stripping system for removing low-content chloroethylene in PPVC (poly (vinyl chloride) latex |
-
2021
- 2021-09-30 CN CN202122388553.7U patent/CN216320058U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114917609A (en) * | 2022-06-17 | 2022-08-19 | 唐山三友氯碱有限责任公司 | Stripping system for removing low-content chloroethylene in PPVC (poly (vinyl chloride) latex |
| CN114917609B (en) * | 2022-06-17 | 2024-03-08 | 唐山三友氯碱有限责任公司 | Stripping system for removing low-content vinyl chloride in PPVC latex |
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