CN219307967U - Paste resin latex stripping device - Google Patents
Paste resin latex stripping device Download PDFInfo
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- CN219307967U CN219307967U CN202223261928.4U CN202223261928U CN219307967U CN 219307967 U CN219307967 U CN 219307967U CN 202223261928 U CN202223261928 U CN 202223261928U CN 219307967 U CN219307967 U CN 219307967U
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- latex
- stripping
- tower
- tube
- paste resin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Abstract
The utility model discloses a paste resin latex stripping device which comprises a stripping unit and a recovery unit, wherein the stripping unit comprises a latex feeding pump, a flow controller, a stripping tower, a liquid level regulator and a latex discharging pump, the recovery unit comprises a tower top condenser, a steam-water separator, a defoaming tower group and a recovery vacuum unit, and the tower top condenser is arranged at the gas phase output end at the top of the stripping tower. The utility model has convenient and simple operation, solves the problems of providing proper heat transfer temperature difference for paste resin latex under indirect heat exchange condition, maintaining good stability and fluidity of the latex at a certain temperature, continuously replacing vinyl chloride monomer desorbed from the latex by flowing carrier gas, realizing continuous mass transfer process, separating the carrier gas from a stripping tower under forced negative pressure recovery pressure difference without increasing the water content of materials, and the content of residual vinyl chloride in the obtained PVC paste resin product meets the requirements of food sanitation grade.
Description
Technical Field
The utility model relates to a paste resin latex stripping device, which is particularly applied to the removal of residual VCM of polyvinyl chloride paste resin.
Background
The polyvinyl chloride paste resin is prepared by emulsion polymerization of vinyl chloride in water, the initial particle size of PVC in the obtained latex is 0.1-2 mu m, and when a certain amount of vinyl chloride monomer is contained in the latex and cannot be effectively removed, substances harmful to human health are formed in the residual paste resin product. The PVC paste resin has fine particles, large specific surface area, easy formation of foam, high latex viscosity, unstable latex at high temperature and easy demulsification and precipitation, so that when vinyl chloride monomer is removed, the unreacted vinyl chloride cannot be removed by adopting the traditional technology in a turbulent state and in a mode of rapid steam temperature rise and bubbling, and the unreacted vinyl chloride can be removed by adopting a direct mass transfer and heat transfer mode.
The existing polyvinyl chloride stripping device generally adopts a suspension PVC slurry stripping device with a condenser on the top, a plurality of layers of tower plates are arranged in a cylinder body, and a spray water stripping tower is arranged at the top of the tower or above the tower plates, so that the device is applicable to the suspension PVC slurry stripping with thicker particles, better thermal stability and free flow in a high-temperature boiling state. However, the material which is extremely unstable and extremely fine in particles cannot be kept in a flowing state at high temperature, and a large amount of foam is easily formed to block a recovery gas line, so that the material is not suitable for stripping paste resin.
The prior polyvinyl chloride slurry stripping device needs to introduce steam at the bottom of the stripping tower to provide heat, the steam finally enters the slurry, water can be removed through a centrifugal dehydration device, no influence is caused on subsequent treatment, but the steam is directly stripped by evaporating the latex which is dried by moisture without dehydration treatment, the steam enters, so that the solid content of materials is reduced, the drying load is increased, the high-temperature steam directly heats the latex, the latex is heated at too high temperature to generate demulsification precipitation and cannot flow, the traditional process adopts a kettle-type or groove-type intermittent stripping process, the stripping time is long, the operation pressure is low, the desorption space of the vinyl chloride is limited, the vinyl chloride in the latex is difficult to diffuse into a gas phase space, the carrier gas cannot be provided to fall off the desorbed vinyl chloride in the stripping process, only static pressure can be formed to depend on pressure difference diffusion, the desorption effect is not high, and the speed is low.
Disclosure of Invention
The utility model provides proper heat transfer temperature difference for paste resin latex under indirect heat exchange condition, maintains good stability and fluidity of latex at a certain temperature, continuously replaces vinyl chloride monomer desorbed from latex by flowing carrier gas, realizes continuous mass transfer process, and separates carrier gas from stripping tower by flowing carrier gas under forced negative pressure recovery pressure difference without increasing water content of materials, and the content of residual vinyl chloride in the obtained PVC paste resin product meets the requirements of food sanitation grade.
The utility model provides the following technical scheme: the stripping device for the paste resin latex comprises a stripping unit and a recovery unit, and is characterized in that the stripping unit comprises a latex feeding pump, a flow controller, a stripping tower, a liquid level regulator and a latex discharging pump, the recovery unit comprises a tower top condenser, a steam-water separator, a defoaming tower group and a recovery vacuum unit, and the tower top condenser is arranged at the gas phase output end at the top of the stripping tower.
The latex feeding pump and the latex discharging pump of the paste resin latex stripping device are mechanical seal type screw conveying pumps.
The stripping tower is a three-section device with a cylindrical structure, the upper section is hollow, the middle section is provided with a latex inlet with a gas-liquid separation device, a falling film tube is arranged downwards, the tube side is filled with heat tracing water, the latex enters the falling film tube, a draft tube is arranged in the falling film tube, the lower section is provided with a steam spray tube, and steam is connected into a gas phase space at the bottom of the stripping tower.
The falling film tube array is a plurality of stainless steel tubes with polished inner walls, tube bundles uniformly distributed at the two ends penetrate through tube arrays and are firmly welded, the tube arrays penetrate out of an upper end plate by 50-80mm to serve as overflow weirs, and a lower end plate is flush with the lower ports of the tube bundles; the honeycomb duct and the falling film duct are concentrically inserted, and the latex forms a liquid film at a gap of 3-5mm between the inner pipe wall and the outer pipe wall; and the falling film shell pass is filled with 60-70 ℃ heat tracing water.
The paste resin latex stripping device is characterized in that two deaeration towers are connected in series to form the deaeration tower group, a conical wire mesh is arranged in the deaeration tower, spines are arranged at the lower part of the wire mesh, and the conical wire mesh of the deaeration tower group is in a multi-layer design.
The recovery vacuum unit is a water ring type vacuum pump, and gas phase components containing vinyl chloride at the outlet of the recovery vacuum unit enter a recovery system to be condensed and recycled.
The flow of the feeding pipeline of the stripping tower of the paste resin latex stripping device is controlled by the DCS through the flow controller; the flow of the discharging pipeline of the stripping tower is controlled by the liquid level regulator through a DCS.
The liquid level controller is used for controlling the liquid level balance of the discharge tower, and preventing steam from being introduced into the liquid latex to form overheated materials and boiling to generate foam.
Compared with the prior art, the utility model applies the falling film evaporation technology and the destructive phase balance principle of reducing the liquid level vapor pressure, is applied to the paste resin latex vinyl chloride removal process, and the main heat source is the falling film pipe heat tracing water, the material passes through the falling film pipe and then converts the large-flow material into a liquid film with low flow rate and high surface area, the heat transfer area is increased, the heat transfer efficiency is improved, enough energy and space are provided for the diffusion of the vinyl chloride in the tower, low-pressure vapor is used as carrier gas, the vapor pressure of the gas-liquid interface water is not increased under the negative pressure state, and the diffusion of the vapor from the gas phase to the liquid phase is reduced, so that the water content of the latex is increased.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
FIG. 2 is a top view of a portion of a stripper of the present utility model.
FIG. 3 is a front view of a portion of a stripper of the present utility model.
Shown in fig. 1-3: the device comprises a latex feeding pump 1, a stripping tower 2, a latex discharging pump 3, a tower top condenser 4, a vapor-liquid separator 5, a defoaming tower group 6, a recycling vacuum unit 7, a flow regulator 8, a liquid level regulator 9, a polyvinyl chloride latex, b latex, c steam and d a gas phase component of vinyl chloride.
Description of the embodiments
Referring to fig. 1 to 3, a paste resin latex stripping apparatus includes a stripping unit and a recovery unit, characterized in that: the stripping unit comprises a latex feeding pump 1, a flow controller 8, a stripping tower 2, a liquid level regulator 9 and a latex discharging pump 3, the recovery unit comprises a tower top condenser 4, a steam-water separator 5, a defoaming tower group 6 and a recovery vacuum unit 7, and the tower top condenser is arranged at the gas phase output end at the top of the stripping tower.
Another embodiment differs in that the latex feed pump and the latex discharge pump are mechanically sealed screw conveyor pumps.
The other embodiment is characterized in that the stripping tower is a three-section device with a cylindrical structure, the upper section is hollow, the latex inlet in the middle section is provided with a gas-liquid separation device, the descending film tube is arranged downwards, the tube side is filled with heat tracing water, the latex enters the descending film tube and is provided with a draft tube, and the lower section is provided with a steam spray tube.
The other embodiment is characterized in that the falling film tube array is a plurality of stainless steel tubes with polished inner walls, tube bundles which are uniformly distributed are penetrated and firmly welded at the tube sheets at the two ends, 50-80mm of the tube bundles penetrate out of the upper end plate to serve as overflow weirs, and the lower end plate is flush with the lower ports of the tube bundles; the draft tube and the falling film tube are concentrically inserted, and the latex forms a liquid film at a gap of 3-5mm between the inner tube wall and the outer tube wall.
The other embodiment is characterized in that the two deaeration towers are connected in series, a conical wire mesh is arranged in the deaeration towers, spines are arranged at the lower parts of the wire mesh, and the conical wire mesh of the deaeration tower is in a multi-layer design.
Another embodiment differs in that it recovers the vacuum unit, is a water ring vacuum pump.
Another embodiment differs in that the magnitude of the stripper feed line flow is controlled by the flow controller using DCS; the flow of the discharging pipeline of the stripping tower is controlled by the liquid level regulator through a DCS.
Claims (6)
1. A paste resin latex stripping apparatus comprising a stripping unit and a recovery unit, characterized in that: the stripping unit comprises a latex feeding pump, a flow controller, a stripping tower, a liquid level regulator and a latex discharging pump, and the recovery unit comprises a tower top condenser, a steam-water separator, a defoaming tower group and a recovery vacuum unit, wherein the tower top condenser is arranged at the gas phase output end at the top of the stripping tower.
2. A paste resin latex stripping apparatus as claimed in claim 1, wherein: the emulsion feed pump and the emulsion discharge pump are mechanical seal screw conveying pumps.
3. A paste resin latex stripping apparatus as claimed in claim 1, wherein: the stripping tower is a three-section device with a cylindrical structure, an upper section is hollow, a gas-liquid separation device is arranged at the latex inlet of the middle section, a falling film tube is arranged downwards, heat tracing water is introduced into the tube side, a draft tube is arranged in the falling film tube, and a steam spray tube is arranged at the lower section.
4. A paste resin latex stripping apparatus as claimed in claim 3, wherein: the falling film tube array is a plurality of stainless steel tubes with polished inner walls, tube bundles which are uniformly distributed are arranged at the tube plates at the two ends in a penetrating way and are firmly welded, the tube bundles penetrate through the upper end plate by 50-80mm and serve as overflow weirs, and the lower end plate is flush with the lower ports of the tube bundles; the draft tube and the falling film tube are concentrically inserted, and the latex forms a liquid film at a gap of 3-5mm between the inner tube wall and the outer tube wall.
5. A paste resin latex stripping apparatus as claimed in claim 1, wherein: the deaeration tower group is that two deaeration towers are used in series, a conical wire mesh is designed in the deaeration tower, spines are arranged at the lower parts of the wire mesh, and the conical wire mesh of the deaeration tower group is of a multi-layer design.
6. A paste resin latex stripping apparatus as claimed in claim 1, wherein: the recycling vacuum unit is a water ring type vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223261928.4U CN219307967U (en) | 2022-12-06 | 2022-12-06 | Paste resin latex stripping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223261928.4U CN219307967U (en) | 2022-12-06 | 2022-12-06 | Paste resin latex stripping device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219307967U true CN219307967U (en) | 2023-07-07 |
Family
ID=87035685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223261928.4U Active CN219307967U (en) | 2022-12-06 | 2022-12-06 | Paste resin latex stripping device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219307967U (en) |
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2022
- 2022-12-06 CN CN202223261928.4U patent/CN219307967U/en active Active
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