CN209734997U - Polymer takes off and waves device - Google Patents

Abstract

The utility model provides a polymer devolatilization device, include: a feeding distribution area, a heating devolatilization area, a stripping devolatilization area, a vapor phase collecting and discharging area, a falling film devolatilization area and a material collecting area. The feeding distribution area is provided with a feeding hole; the heating devolatilization zone is positioned below the feeding distribution zone and is provided with a heating device for heating the polymer to a devolatilization temperature; the falling strip devolatilization area is positioned below the heating devolatilization area and above the falling film devolatilization area; the vapor phase collecting and discharging area and the strip falling devolatilization area are arranged above the falling film devolatilization area in parallel, and the vapor phase collecting and discharging area is provided with a volatile component outlet; the falling film devolatilization area is provided with a liquid collecting distributor which is connected to a motor outside the devolatilization device through a rotating shaft, and the falling strip devolatilization area and the vapor phase collecting and arranging area are arranged at two sides of the rotating shaft; the material collecting area is arranged below the falling film devolatilization area and is provided with a discharge hole. After adopting above-mentioned technical scheme, the devolatilization device can be to polymer high efficiency devolatilization, can show simultaneously and reduce the smuggle to liquid phase polymer when volatile gas discharges.

Description

Polymer takes off and waves device

Technical Field

The utility model relates to a polymer takes off and waves technical field, especially relates to a polymer takes off and waves device.

Background

Polymer devolatilization is a process for separating low molecular weight components, including unreacted monomers, solvents, and various polymerization byproducts, commonly referred to collectively as volatiles, from a polymer system, which are components that should not be contained in the polymer. The content of these volatile components is only a few parts per million at the lowest and can reach tens of percent at the highest. The purpose of removing volatile components from the polymer body is to improve the polymer performance, meet the requirements of health and environment, remove peculiar smell, improve the polymerization degree and improve and enhance the mechanical properties of the polymer, so that the polymer devolatilization becomes an important process of the polymer production process flow.

Industrial devolatilization equipment can be classified into two major types, static and dynamic, depending on the presence or absence of mechanical agitation or whether mechanical agitation is important for separation of volatiles from the polymer. Static devolatilization equipment is often simple in structure, low in power consumption, high in reliability, and suitable for polymers or polymer solutions with low viscosity and easy to flow. The dynamic devolatilization equipment is complex in structure and high in power consumption, can provide large-range surface updating for mass transfer and heat transfer, is beneficial to material flow, and is suitable for treating high-viscosity polymers or polymer solutions.

In actual production, the polymer has various types, large physical span and different treatment requirements, and in order to enable single-type devolatilization equipment to meet actual and various requirements, the common method is to simply connect the equipment in series by adopting a pipeline to realize a continuous multistage devolatilization process, so that the purpose of expanding the application range of the equipment is achieved. This undoubtedly leads to an increase in the purchase cost of the equipment and an increase in the floor area of the apparatus and an increase in the energy consumption for operation. In order to keep the volatile content of the polymer as low as possible, the polymer is first heated to a given temperature, often with a large heater volume. If the heating efficiency of the heater is not high, and the viscosity of the polymer is high, the temperature of the heating medium must be increased to reach the temperature required by devolatilization, so that hot spots with local high temperature are easily formed in the heater, and the polymer is decomposed at high temperature. Thus, while ensuring that the polymer is heated to a given temperature, the heater should be kept as small as possible, and preferably still achieve a uniform temperature field distribution within a limited, as small as possible device volume (space). Thus, the polymer is efficiently heated to the temperature required by the devolatilization process, and the polymer decomposition caused by local overheating is avoided; meanwhile, the residual dead zone of the polymer in the equipment is avoided as much as possible, and the polymer in the dead zone can be decomposed due to long-term high temperature to influence the performance of the polymer. Meanwhile, the existing partial devolatilization device carries more liquid-phase polymer materials when volatile gas is discharged, so that the polymer yield is reduced, or when the devolatilization device is used for treating polymer solution with high volatile content, the volatile gas speed is high, the volatile gas carries the liquid-phase polymer to a vapor-phase outlet pipeline, so that the vapor-phase pipeline is blocked.

therefore, there is a need to develop an integrated polymer devolatilization device which has a compact structure, a small volume, and a small amount of entrainment of polymer during the discharge of volatile gas, and can perform static and dynamic multistage high-efficiency devolatilization of polymer at a suitable process temperature.

SUMMERY OF THE UTILITY MODEL

in order to overcome the technical defect, the utility model aims to provide a compact structure, small entrain the polymer less during volatile gas exhaust, and can carry out the integrated type polymer that static, the multistage high efficiency of developments was taken off and is waved device to the polymer at suitable process temperature.

The utility model discloses a polymer takes off and waves device, take off and wave the device and be provided with: a feeding distribution area 1, a heating devolatilization area 2, a stripping devolatilization area 3, a vapor phase collecting and discharging area 4, a falling film devolatilization area 5 and a material collecting area 7; the feeding distribution area 1 is provided with a feeding hole 9; the heating devolatilization zone 2 is positioned below the feeding distribution zone 1, and the heating devolatilization zone 2 is provided with a heating device for heating the polymer to devolatilization temperature; the falling strip devolatilization zone 3 is positioned below the heating devolatilization zone 2 and above the falling film devolatilization zone 5; the vapor phase collecting and discharging area 4 and the stripping and devolatilizing area 3 are arranged above the falling film devolatilizing area 5 in parallel, and a volatile component outlet 13 is arranged at the top or the side surface of the vapor phase collecting and discharging area 4; the falling film devolatilization region 5 is provided with a liquid collecting distributor 14, the liquid collecting distributor 14 is fixedly connected to a rotating shaft 11, the rotating shaft 11 is connected to a motor outside the devolatilization device, and the falling strip devolatilization region 3 and the vapor phase collecting and discharging region 4 are respectively arranged at two sides of the rotating shaft 11; the material collecting region 7 is positioned below the falling film devolatilization region 5, and a discharge hole 8 is formed in the material collecting region 7; the polymer enters a feeding distribution area 1 from a feeding hole 9, then enters a heating devolatilization area 2, is heated by the heating device in the heating devolatilization area 2 and is subjected to primary devolatilization, then enters a stripping devolatilization area 3 to be subjected to secondary devolatilization, then falls onto a liquid collecting distributor 14 of a falling film devolatilization area 5, the liquid collecting distributor 14 is driven by a motor to rotate, so that the polymer forms a downward flowing liquid film on the liquid collecting distributor 14 under the dual actions of gravity and centrifugal force, the liquid film is subjected to tertiary devolatilization in the downward flowing and falling process, then is thrown out of the wall surface of a shell of the devolatilization device, flows downwards along the wall surface of the shell, enters a material collecting area 7 and is discharged from a discharging hole 8; the volatile components in the polymer are discharged from the volatile component outlet 13 of the vapor phase collecting and discharging zone 4.

Preferably, a foam breaking and devolatilizing area 6 is arranged between the falling film devolatilizing area 5 and the material collecting area 7; the foam breaking and devolatilizing area 6 is provided with a plurality of groups of scraping plates 15, one end of each scraping plate 15 is close to the inner surface of the shell of the foam breaking and devolatilizing area 6, and the other end of each scraping plate 15 is fixedly connected to the rotating shaft 11; the polymer which is thrown out to the wall surface of the shell of the devolatilization device by the liquid collection distributor 14 flows downwards along the wall surface of the shell and enters the foam breaking devolatilization area 6, the scraper 15 rotates along with the rotation of the rotating shaft 11 to push the polymer to form a liquid film on the inner wall of the foam breaking devolatilization area 6, meanwhile, the volatile component vapor bubbles which exist in the polymer are forcedly broken by the scraper, the volatile component enters the vapor phase from the liquid phase of the polymer to complete the fourth stage devolatilization, and then the polymer flows downwards and enters the material collecting area 7.

Preferably, the casing in broken bubble devolatilization district 6 is the back taper, the lower part of liquid collection distributor 14 is back taper linkage segment 20, linkage segment 20 and pivot 11 fixed connection, scraper 15 one end is close to broken bubble devolatilization district 6's casing internal face, other end fixed connection to linkage segment 20.

Preferably, an independent or combined jacket 17, or an electric heat tracing device, or an insulating layer is arranged outside the shells of the stripping devolatilization zone 3, the vapor phase collecting and discharging zone 4, the falling film devolatilization zone 5, the foam breaking devolatilization zone 6 and the material collecting zone 7; a heat exchange medium flows through the jacket 17.

preferably, the discharge hole 8 is arranged on the bottom surface of the material collecting area 7; the motor set up in devolatilization device top, the casing top between the strip that falls and devolatilizes district 3 and the vapour phase collection arranges the district 4 is provided with and wears the shaft mouth 12, pivot 11 passes wear shaft mouth 12 and devolatilization device top the motor is connected.

preferably, the discharge hole 8 is arranged on the side surface of the material collecting area 7; a shaft penetrating port 12 is formed in the top of the shell between the stripping and devolatilization zone 3 and the vapor phase collecting and discharging zone 4, and the rotating shaft 11 penetrates through the shaft penetrating port 12 to be connected with the motor at the top of the devolatilization device; or the bottom surface of the material collecting area 7 is provided with a shaft penetrating opening 12, and the rotating shaft 11 penetrates through the shaft penetrating opening 12 to be connected with the motor at the bottom of the devolatilization device.

Preferably, the heating device is a shell-and-tube heat exchanger, and the tube layer of the shell-and-tube heat exchanger comprises a plurality of heating tubes 10 which are arranged from top to bottom; the polymer entering the heating devolatilization zone 2 flows downwards along the inner wall surface of the heating array tube 10, and flows out from the lower end opening of the heating array tube 10 to enter the stripping devolatilization zone 3.

Preferably, the interior of the heating array tube 10 is empty or provided with an insert; the insert is at least two interconnected flights, the flights twist 180 degrees and are welded with the heating tube nest 10 body in the spiral direction, the rotation directions of adjacent flights are opposite, the central points are connected and form 90 degrees with each other.

Preferably, the material collecting area 7 is provided with a pushing screw 16 for pushing the polymer to move downwards, and the pushing screw 16 is fixedly connected with the rotating shaft 11.

preferably, the liquid collecting distributor 14 is spherical or umbrella-shaped.

After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:

1. The utility model discloses compact structure collects multistage devolatilization in a single device (shell dress), equipment structure is compact, and is small, and material heat time is short, and heat transfer, mass transfer efficiency are high, can effectively prevent the scale deposit on the device inner wall, avoid the polymer material remaining to lead to the long-time high temperature aging of polymer to decompose inside the devolatilization ware.

2. The utility model discloses a set up the flight in the heating tubulation in the shell and tube type heat exchanger, can realize radial mixed function for the polymer distributes more evenly at the radial temperature field that upwards of heating tubulation, and the local overheat that has avoided the polymer leads to the polymer to decompose. Meanwhile, the spiral sheet is inserted into the center of the polymer to heat, so that the effective heat transfer area of the heater is increased under the condition of not increasing the volume of equipment, or the heat transfer area of the unit volume of the heater is increased; in addition, the special structure can effectively thin the laminar boundary layer of the polymer on the inner surface of the heating area, improve the heat transfer coefficient, strengthen the heat transfer and mass transfer and force the interface to be updated, thereby effectively improving the devolatilization efficiency.

3. The utility model discloses take off and wave collection liquid distributor of device still possesses the falling film and deviate from the function of volatile when realizing that the good secondary of material distributes liquid and distribute, guarantees that the material takes off at the falling film and waves the district and takes off evenly distributed on the inner wall in district with broken bubble.

4. the utility model discloses take off and wave the scraper blade of device and have broken bubble and clear away the function of remaining material concurrently.

5. The utility model discloses a take off and wave device and to smuggleing secretly of liquid phase polymer when can showing the gaseous discharge of reduction volatile.

Drawings

FIG. 1 is a schematic view of a polymer devolatilization apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view of a polymer devolatilization apparatus according to another embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a heating array tube according to an embodiment of the present invention.

Reference numerals:

1-a feed distribution area, 2-a heating devolatilization area, 3-a stripping devolatilization area, 4-a vapor phase collection and discharge area, 5-a falling film devolatilization area, 6-a foam breaking devolatilization area, 7-a material collecting area, 8-a discharge port, 9-a feed port, 10-a heating tube array, 101-a spiral plate, 11-a rotating shaft, 12-a shaft penetrating port, 13-a volatile component outlet, 14-a liquid collecting distributor, 15-a scraping plate, 16-a material pushing spiral, 17-a jacket, 18-a heat exchange medium inlet, 19-a heat exchange medium outlet and 20-a connecting section.

Detailed Description

the advantages of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

in the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

In the following description, suffixes such as "module", "part", or "unit" used to indicate elements are used only for the convenience of description of the present invention, and have no specific meaning in itself. Thus, "module" and "component" may be used in a mixture.

Example one

referring to fig. 1, a schematic structural diagram of a polymer devolatilization device according to an embodiment of the present invention is shown, wherein the devolatilization device is provided with: a feeding distribution area 1, a heating devolatilization area 2, a stripping devolatilization area 3, a vapor phase collecting and discharging area 4, a falling film devolatilization area 5, a foam breaking devolatilization area 6 and a material collecting area 7.

Feeding distribution district 1 is provided with feed inlet 9, feed inlet 9 sets up feeding distribution district 1's top or side, the polymer is followed feed inlet 9 gets into the devolatilization device. In this embodiment, the feed inlet 9 is arranged at the top of the feed distribution zone 1.

Heating devolatilization area 2 is located feeding distribution area 1 below, heating devolatilization area 2 is provided with heating device, be used for with the polymer is heated to devolatilization required temperature and has the devolatilization function simultaneously, the polymer is here accomplished first level and is devolatilized. Preferably, the heating device is a shell-and-tube heat exchanger, the tube layer of the shell-and-tube heat exchanger comprises a plurality of heating tubes 10 which are arranged from top to bottom, and the polymer enters from the upper part of the tube layer and flows out from the lower part; the heat exchange medium enters from a heat exchange medium inlet 18 at a low point on the left side of the shell layer and is discharged from a heat exchange medium outlet 19 at a high point on the right side of the shell layer, the heat exchange medium enters from the low point and enters from the high point, so that the retention time of the heat exchange medium can be prolonged, the heat exchange medium and the polymer can fully exchange heat, the polymer is heated to the temperature required by devolatilization, and the heat exchange medium can be preferably high-temperature steam or other heat exchange media. The polymer entering from the feed inlet 9 is uniformly distributed into the heating array tube 10, flows downwards along the inner wall surface of the heating array tube 10, is devolatilized while being heated, and flows out from the lower end opening of the heating array tube 10 to enter the stripping devolatilization area 3. The interior of the heating tube array 10 is empty or provided with an insert. Referring to fig. 3, in the present embodiment, an inner insert is disposed inside the heating tube array 10, the inner insert is at least two interconnected spiral sheets 101, the spiral sheets 101 are twisted by 180 ° and welded to the body of the heating tube array 10 in the spiral direction, the rotation directions of the adjacent spiral sheets 101 are opposite, the central points are connected and are 90 ° to each other. The spiral sheets are arranged in the heating tube array 10, so that the heat exchange area is increased, and the heat exchange effect is improved; on the other hand, the spiral sheet can effectively thin the laminar boundary layer of the polymer on the inner surface of the heating area, improve the heat exchange coefficient, strengthen the heat transfer and mass transfer and force the interface to be updated, thereby effectively improving the devolatilization efficiency. In some embodiments, the heating device is another type of heat exchanger, and in other embodiments, the heating device is an electric heater or other suitable heater.

falling strip devolatilization area 3 is located below heating devolatilization area 2 and above falling film devolatilization area 5, after the polymer is subjected to first-stage devolatilization in heating devolatilization area 2, the polymer coming out from heating devolatilization area 2 falls into falling strip devolatilization area 3 in the form of liquid drop, liquid column or liquid film under the action of gravity, at this time, the vapor phase space becomes large, the pressure is reduced, the vapor-liquid contact area is increased, and the volatile diffusion distance is shortened, so that the volatile can be effectively removed, and the second-stage devolatilization is completed.

The vapor phase collecting and discharging area 4 and the stripping devolatilization area 3 are arranged above the falling film devolatilization area 5 in parallel, and a volatile component outlet 13 is arranged at the top or the side surface of the vapor phase collecting and discharging area 4. In this embodiment, the volatile matter outlet 13 is provided at the top of the vapor phase collection and discharge region 4. The volatile component outlet 13 is connected to a volatile component recovery system, the pressure of the volatile component recovery system is less than the pressure in the devolatilization device, and the vapor phase volatile components removed in each region in the devolatilization device are collected in the vapor phase concentrated discharge region 4 and are discharged into the volatile component recovery system through the volatile component outlet 13.

Falling film devolatilization district 5 is provided with liquid collection distributor 14, and liquid collection distributor 14 fixed connection is to pivot 11, pivot 11 is connected to devolatilization device outside motor, the strip devolatilization district 3 with vapour phase collection row district 4 lists in pivot 11 both sides. Referring to fig. 1, the stripping devolatilization zone 3 is located on the left side of the rotating shaft 11, the vapor phase collecting and discharging zone 4 is located on the right side of the rotating shaft, and the vapor phase collecting and discharging zone 4 and the stripping devolatilization zone 3 are arranged on the left and right sides of the rotating shaft 11, so that entrainment of liquid phase polymers during discharge of volatile gas is reduced, particularly entrainment of liquid phase polymers falling in the stripping devolatilization zone 3 is reduced, and the devolatilization device is more beneficial when processing material systems with large vapor phase flow. In this embodiment, the motor is arranged at the top of the devolatilization device, the top of the shell between the falling strip devolatilization zone 3 and the vapor phase collecting and discharging zone 4 is provided with a shaft penetrating port 12, and the rotating shaft 11 penetrates through the shaft penetrating port 12 to be connected with the motor at the top of the devolatilization device. Preferably, the gap between the rotating shaft 11 and the shaft penetrating port 12 is a mechanical seal, and in some embodiments, a packing seal, a labyrinth seal or other suitable sealing forms may be adopted. Preferably, the liquid collection distributor 14 is spherical or umbrella-shaped. In the present embodiment, the liquid collecting distributor 14 is spherical, i.e. the upper surface thereof is spherical. On the polymer that comes from stripping devolatilization zone 3 fell to collection liquid distributor 14, collection liquid distributor 14 was rotatory under the drive of motor, under the effect of gravity and centrifugal force, the polymer formed even liquid film on collection liquid distributor 14, and volatile component diffusion distance shortens, and the polymer surface is more fast, and volatile component desorption is effectual, and the polymer is here accomplished the third pole and is devolatilized. The liquid film is evenly thrown out onto the shell wall of the devolatilizer after flowing to the edge of the liquid collection distributor 14. In the process that the polymer is thrown out from the edge of the liquid collection distributor 14 to the wall surface of the shell, stripping devolatilization occurs, the contact area of the polymer and a vapor phase is increased in the process, and the diffusion distance of volatile components is shortened, so that the volatile components can be effectively removed.

The polymer thrown out onto the shell wall of the devolatilization apparatus flows downward into the bubble-breaking devolatilization zone 6. In the process that the polymer flows downwards along the inner wall of the shell, the diffusion distance of the volatile components is shortened, the surface of the polymer is updated quickly, and the volatile components can be effectively removed. The foam breaking and devolatilizing area 6 is located below the falling film devolatilizing area 5, the foam breaking and devolatilizing area 6 is provided with a plurality of groups of scrapers 15, one end of each scraper 15 is close to the inner wall surface of the shell of the foam breaking and devolatilizing area 6, and the other end of each scraper 15 is fixedly connected to the rotating shaft 11, wherein the fixed connection can be a direct fixed connection between the scraper 15 and the rotating shaft 11 or an indirect fixed connection, for example, the scraper 15 is fixedly connected to the rotating shaft 11 through other parts. In this embodiment, the shell of the foam breaking devolatilization area 6 is in an inverted cone shape, the lower part of the liquid collecting distributor 14 is an inverted cone-shaped connecting section 20, and the connecting section 20 is fixedly connected with the rotating shaft 11. One end of the scraper 15 is close to the inner wall surface of the shell of the foam breaking and devolatilizing area 6, the other end of the scraper 15 is fixedly connected to the connecting section 20, and the scraper 15 is fixedly connected to the rotating shaft through the connecting section 20. Preferably, the connecting section 20 is a frame structure formed by fixedly connecting a plurality of reinforcing bars, and the whole frame structure is in an inverted cone shape, and gaps exist among the reinforcing bars, so that volatile gas removed from the polymer can rise to the vapor phase collecting and discharging area 4 through the gaps. In some embodiments, the connecting section 20 may not be provided, and the scraper 15 is directly fixedly connected with the rotating shaft 11. The scraper 15 rotates along with the rotation of the rotating shaft 11 to push the polymer to form a thin liquid film on the wall surface of the shell of the foam breaking and devolatilizing area 6, and in the process that the scraper 15 pushes the polymer to form the film, the scraper 15 can force the volatile bubbles which are formed in the polymer and have not been broken or diffused into a vapor phase to break the foam, so that the volatile components wrapped in the liquid-phase vapor bubbles enter the vapor phase, and the deep devolatilization is realized. Where the polymer completes the fourth stage of devolatilization. At the same time, the scraper 15 is preferably arranged obliquely, and pushes the polymer to flow downwards into the material collecting area 7 while breaking the bubbles. In some implementations, no bubble destruction devolatilization zone 6 is provided between the falling film devolatilization zone 5 and the material collection zone 7, and the polymer flows down the shell wall face directly into the material collection zone 7.

The material collecting region 7 is provided with a discharge port 8, and the discharge port 8 is arranged on the bottom surface or the side surface of the material collecting region 7. In this embodiment, the discharge gate 8 set up in the bottom surface in material collection region 7, the motor set up in devolatilization device top, the shell top between the strip devolatilization region 3 and the vapor phase concentrated row region 4 is provided with through axle mouth 12, pivot 11 passes through axle mouth 12 is connected with the motor at devolatilization device top. By arranging a power device such as a motor at the top of the device and arranging the discharge port 8 at the bottom surface of the material collecting region 7, the polymer can flow and be discharged from top to bottom under the action of gravity, and the power device such as the motor does not form obstruction or obstruction to the discharge of the polymer. Preferably, in the present embodiment, the material collecting area 7 is provided with a pushing screw 16 for pushing the polymer to move downwards, and the pushing screw 16 is fixedly connected with the rotating shaft 11. The pushing screw 16 is a screw pusher, rotates with the rotation of the rotating shaft 11, and pushes the polymer to move downward. In some embodiments, the material collecting area 7 is not provided with the pushing screw 16, and the polymer entering the material collecting area 7 flows under the action of gravity or pressure and is discharged from the discharge port 8.

In this embodiment, an independent or combined jacket 17 is arranged outside the shell of the falling strip devolatilization region 3, the vapor phase collecting and discharging region 4, the falling film devolatilization region 5, the foam breaking devolatilization region 6 and the material collecting region 7, and a heat exchange medium is circulated in the jacket 17 for keeping the temperature of the above regions within the optimal temperature range for devolatilization, thereby improving the devolatilization efficiency. The independent jacket is used for controlling the temperature inside the shell by independently arranging the jacket outside each zone shell; the joint jacket as used herein means that the shell of the above-mentioned region is disposed in one jacket, and the temperature of the above-mentioned region is controlled by this one jacket. In some embodiments, the shells of the falling strip devolatilization zone 3, the vapor phase collecting and discharging zone 4, the falling film devolatilization zone 5, the bubble breaking devolatilization zone 6 and the material collecting zone 7 are externally provided with electric heat tracing devices for heating the shells of the zones to keep the temperature of the zones within the optimal temperature range for devolatilization. Preferably, the electric tracing band is an electric tracing band. In other embodiments, the shell of the falling strip devolatilization zone 3, the vapor phase collecting and discharging zone 4, the falling film devolatilization zone 5, the foam breaking devolatilization zone 6 and the material collecting zone 7 are externally provided with an insulating layer, and since the polymer is heated to the temperature required by devolatilization in the heating devolatilization zone 2, the heat loss of the device is reduced by arranging the insulating layer outside the shell of the zone, the temperature of the zone can be kept at the temperature required by devolatilization, thereby improving the devolatilization efficiency. The heat-insulating layer can be an organic heat-insulating material or an inorganic heat-insulating material.

Example two

referring to fig. 2, a schematic structural diagram of a polymer devolatilization device according to another embodiment of the present invention is shown, wherein the devolatilization device is provided with: a feeding distribution area 1, a heating devolatilization area 2, a stripping devolatilization area 3, a vapor phase collecting and discharging area 4, a falling film devolatilization area 5, a foam breaking devolatilization area 6 and a material collecting area 7.

Feeding distribution district 1 is provided with feed inlet 9, feed inlet 9 sets up feeding distribution district 1's top or side, the polymer is followed feed inlet 9 gets into the devolatilization device. In this embodiment, the feed inlet 9 is arranged at the top of the feed distribution zone 1.

The heating devolatilization area 2 is positioned below the feeding distribution area 1, the heating devolatilization area 2 is provided with a shell-and-tube heat exchanger, the tube layer of the shell-and-tube heat exchanger comprises a plurality of heating tubes 10 which are arranged from top to bottom, and the polymer enters from the upper part of the tube layer and flows out from the lower part; the heat exchange medium enters from a heat exchange medium inlet 18 at the lower point on the right side of the shell layer and is discharged from a heat exchange medium outlet 19 at the high point on the left side of the shell layer, the heat exchange medium enters from the lower point and enters from the high point, so that the retention time of the heat exchange medium can be prolonged, the heat exchange medium and the polymer can fully exchange heat, the polymer is heated to the temperature required by devolatilization, and the heat exchange medium can be preferably high-temperature steam or other heat exchange media. The polymer entering from the feed inlet 9 is uniformly distributed into the heating array tube 10, flows downwards along the inner wall surface of the heating array tube 10, is devolatilized while being heated, and flows out from the lower end opening of the heating array tube 10 to enter the stripping devolatilization area 3. An inner insert is arranged in the heating tube array 10, the inner insert is at least two connected spiral sheets 101, the spiral sheets 101 are twisted by 180 degrees and welded with the heating tube array 10 body in the spiral line direction, the rotating directions of the adjacent spiral sheets 101 are opposite, the central points are connected, and the central points are 90 degrees. The spiral sheets are arranged in the heating tube array 10, so that the heat exchange area is increased, and the heat exchange effect is improved; on the other hand, the spiral sheet can effectively thin the laminar boundary layer of the polymer on the inner surface of the heating area, improve the heat exchange coefficient, strengthen the heat transfer and mass transfer and force the interface to be updated, thereby effectively improving the devolatilization efficiency.

Falling strip devolatilization area 3 is located below heating devolatilization area 2 and above falling film devolatilization area 5, after the polymer is subjected to first-stage devolatilization in heating devolatilization area 2, the polymer coming out from heating devolatilization area 2 falls into falling strip devolatilization area 3 in the form of liquid drop, liquid column or liquid film under the action of gravity, at this time, the vapor phase space becomes large, the pressure is reduced, the vapor-liquid contact area is increased, and the volatile diffusion distance is shortened, so that the volatile can be effectively removed, and the second-stage devolatilization is completed.

The vapor phase collecting and discharging area 4 and the stripping devolatilization area 3 are arranged above the falling film devolatilization area 5 in parallel, and a volatile component outlet 13 is arranged at the top of the vapor phase collecting and discharging area 4. The volatile component outlet 13 is connected to a volatile component recovery system, the pressure of the volatile component recovery system is less than the pressure in the devolatilization device, and the vapor phase volatile components removed in each region in the devolatilization device are collected in the vapor phase concentrated discharge region 4 and are discharged into the volatile component recovery system through the volatile component outlet 13.

Falling film devolatilization area 5 is provided with liquid collecting distributor 14, and liquid collecting distributor 14 fixed connection is to pivot 11, pivot 11 is connected to devolatilization device outside motor, the strip devolatilization area 3 with vapour phase is concentrated and is arranged the district 4 branch in pivot 11 both sides, and vapour phase is concentrated and is arranged district 4 and be located the left side of pivot 11, and strip devolatilization area 3 is located the right side of pivot 11, through arranging vapour phase collection and is arranged district 4 and strip devolatilization area 3 branch and be listed as pivot 11 left and right sides setting, is favorable to reducing the smuggleing secretly of liquid phase polymer when the volatile gas is discharged, especially reduces smuggleing secretly to the liquid phase polymer of whereabouts in strip devolatilization area 3 to it is more favorable when handling the great system of vapour phase flow to make the devolatilization device. The motor set up in devolatilization device top, the casing top between the strip that falls and devolatilizes district 3 and the vapour phase collection arranges the district 4 is provided with and wears the shaft mouth 12, pivot 11 passes wear shaft mouth 12 and devolatilization device top the motor is connected. And a gap between the rotating shaft 11 and the shaft penetrating port 12 is sealed mechanically. The liquid collection distributor 14 is umbrella-shaped, and the polymer that comes from the strip devolatilization district 3 falls on liquid collection distributor 14, and liquid collection distributor 14 is rotatory under the drive of motor, under the effect of gravity and centrifugal force, the polymer forms even liquid film on liquid collection distributor 14, and volatile diffusion distance shortens, and the polymer surface is more up-to-date, and volatile desorption is effectual, and the polymer is here accomplished the third pole and is devolatilized. The liquid film is evenly thrown out onto the shell wall of the devolatilizer after flowing to the edge of the liquid collection distributor 14. In the process that the polymer is thrown out from the edge of the liquid collection distributor 14 to the wall surface of the shell, stripping devolatilization occurs, the contact area of the polymer and a vapor phase is increased in the process, and the diffusion distance of volatile components is shortened, so that the volatile components can be effectively removed.

The polymer thrown out onto the shell wall of the devolatilization apparatus flows downward into the bubble-breaking devolatilization zone 6. In the process that the polymer flows downwards along the inner wall of the shell, the diffusion distance of the volatile components is shortened, the surface of the polymer is updated quickly, and the volatile components can be effectively removed. Broken bubble devolatilization area 6 is located falling film devolatilization area 5 below, the shell of broken bubble devolatilization area 6 is in an inverted cone shape, the lower part of liquid collection distributor 14 is inverted cone-shaped connecting section 20, connecting section 20 and rotating shaft 11 fixed connection. The foam breaking and devolatilizing area 6 is provided with a plurality of groups of scrapers 15, one end of each scraper 15 is close to the inner wall surface of the shell of the foam breaking and devolatilizing area 6, the other end of each scraper 15 is fixedly connected to the connecting section 20, and each scraper 15 is fixedly connected to the rotating shaft through the connecting section 20. The connection section 20 is a frame structure which is formed by fixedly connecting a plurality of reinforcing steel bars and is integrally in an inverted cone shape, gaps exist among the reinforcing steel bars, and volatile gas removed from the polymer can rise to the vapor phase collecting and discharging area 4 through the gaps. The scraper 15 rotates along with the rotation of the rotating shaft 11 to push the polymer to form a thin liquid film on the wall surface of the shell of the foam breaking and devolatilizing area 6, and in the process that the scraper 15 pushes the polymer to form the film, the scraper 15 can force the volatile bubbles which are formed in the polymer and have not been broken or diffused into a vapor phase to break the foam, so that the volatile components wrapped in the liquid-phase vapor bubbles enter the vapor phase, and the deep devolatilization is realized. Where the polymer completes the fourth stage of devolatilization. At the same time, the scraper 15 is arranged obliquely, and pushes the polymer to flow downwards into the material collecting area 7 while breaking the bubbles.

And a discharge hole 8 is formed in the side surface of the material collecting region 7. Further, the material collecting area 7 is provided with a pushing spiral 16 for pushing the polymer to move downwards, and the pushing spiral 16 is fixedly connected with the rotating shaft 11. The pushing screw 16 is a screw pusher, rotates with the rotation of the rotating shaft 11, and pushes the polymer to move downwards and be discharged from the discharge port 8. In this embodiment, the discharge hole 8 is disposed at the side of the material collecting region 7; the top of the shell between the stripping devolatilization zone 3 and the vapor phase collecting and discharging zone 4 is provided with a shaft penetrating port 12, and the rotating shaft 11 penetrates through the shaft penetrating port 12 to be connected with the motor at the top of the devolatilization device. In some embodiments, when the discharge port 8 is disposed at the side of the material collecting region 7, the motor may also be disposed at the bottom of the devolatilizer, and by this, the bottom of the material collecting region 7 is disposed with a shaft passing port 12, so that the rotating shaft 11 passes through the shaft passing port 12 and is connected to the motor at the bottom of the devolatilizer.

In this embodiment, a combined jacket 17 is arranged outside the shell of the stripping devolatilization zone 3, the vapor phase collecting and discharging zone 4, the falling film devolatilization zone 5, the foam breaking devolatilization zone 6 and the material collecting zone 7, and a heat exchange medium is circulated in the jacket 17 for keeping the temperature of the above zones within the optimal temperature range for devolatilization, thereby improving the devolatilization efficiency.

In the present application, the polymer includes a polymer solution and a polymer bulk. The polymer solution generally has a relatively high content of volatile components, which include a large amount of solvent and other volatile components, and the polymer devolatilization apparatus of the present application can be effectively used for devolatilizing the polymer solution. The polymer body generally contains a small volatile component, and the polymer body is taken as a main component, so that the polymer devolatilization device can be effectively used for devolatilizing the polymer body, and can reduce the residual volatile component to be very low.

The polymer devolatilization device has the advantages of compact structure, small equipment volume, short material heating time, high heat transfer and mass transfer efficiency, and can perform static and dynamic multistage high-efficiency devolatilization on polymers at proper process temperature through a plurality of areas arranged from top to bottom, and meanwhile, the temperature field in the device is uniform without dead zones. The polymer devolatilization device can also effectively reduce entrainment of liquid phase polymer when volatile gas is discharged, and has remarkable effect when a system with large vapor phase flow is treated. The polymer devolatilization device is high in volatile component removing efficiency, good in devolatilization effect and capable of long-period efficient stable operation.

It should be noted that the embodiments of the present invention have better practicability and are not intended to limit the present invention in any way, and any person skilled in the art may change or modify the technical contents disclosed above to equivalent effective embodiments, but all the modifications or equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims (10)

1. a polymer devolatilization device is characterized in that,

the devolatilization device is provided with: a feed distribution area (1), a heating devolatilization area (2), a stripping devolatilization area (3), a vapor phase collection and discharge area (4), a falling film devolatilization area (5) and a material collection area (7);

The feeding distribution area (1) is provided with a feeding hole (9); the heating devolatilization zone (2) is positioned below the feeding distribution zone (1), and the heating devolatilization zone (2) is provided with a heating device for heating the polymer to a devolatilization temperature; the stripping devolatilization area (3) is positioned below the heating devolatilization area (2) and above the falling film devolatilization area (5); the vapor phase collecting and discharging area (4) and the stripping and devolatilizing area (3) are arranged above the falling film devolatilizing area (5) in parallel, and a volatile component outlet (13) is arranged at the top or the side surface of the vapor phase collecting and discharging area (4); the falling film devolatilization region (5) is provided with a liquid collecting distributor (14), the liquid collecting distributor (14) is fixedly connected to a rotating shaft (11), the rotating shaft (11) is connected to a motor outside the devolatilization device, and the falling strip devolatilization region (3) and the vapor phase collecting and discharging region (4) are respectively arranged on two sides of the rotating shaft (11); the material collecting region (7) is positioned below the falling film devolatilization region (5), and a discharge hole (8) is formed in the material collecting region (7);

The polymer enters a feeding distribution area (1) from a feeding hole (9), then enters a heating devolatilization area (2), is heated by the heating device in the heating devolatilization area (2) and is subjected to primary devolatilization, then enters a stripping devolatilization area (3) for secondary devolatilization, then falls onto a liquid collecting distributor (14) of a falling film devolatilization area (5), the liquid collecting distributor (14) is driven by a motor to rotate, so that the polymer forms a downward flowing liquid film on the liquid collecting distributor (14) under the dual actions of gravity and centrifugal force, the liquid film is subjected to tertiary devolatilization in the downward flowing falling process, and then is thrown out of the shell wall surface of the devolatilization device, flows downwards along the shell wall surface, enters a material collecting area (7) and is discharged from a discharging hole (8); the volatile components in the polymer are discharged from a volatile component outlet (13) of the vapor phase collecting and discharging zone (4).

2. The devolatilizer device as recited in claim 1 wherein,

A foam breaking and devolatilizing area (6) is arranged between the falling film devolatilizing area (5) and the material collecting area (7);

The foam breaking and devolatilizing area (6) is provided with a plurality of groups of scraping plates (15), one end of each scraping plate (15) is close to the inner surface of the shell of the foam breaking and devolatilizing area (6), and the other end of each scraping plate (15) is fixedly connected to the rotating shaft (11);

the polymer which is thrown out of the shell wall surface of the devolatilization device by the liquid collection distributor (14) flows downwards along the shell wall surface and enters the foam breaking devolatilization area (6), the scraper (15) rotates along with the rotation of the rotating shaft (11) to push the polymer to form a liquid film on the inner wall of the foam breaking devolatilization area (6), meanwhile, volatile steam bubbles existing in the polymer are forcedly broken by the scraper, the volatile enters a steam phase from the polymer liquid phase to complete fourth-stage devolatilization, and then the polymer flows downwards and enters the material collecting area (7).

3. The devolatilizer device as recited in claim 2 wherein,

Broken bubble devolatilization district's (6) casing is the back taper, the lower part of collection liquid distributor (14) is back taper linkage segment (20), linkage segment (20) and pivot (11) fixed connection, scraper blade (15) one end is close broken bubble devolatilization district's (6) casing inner wall face, other end fixed connection to linkage segment (20).

4. the devolatilizer device as recited in claim 2 wherein,

An independent or combined jacket (17), or an electric heat tracing device, or a heat insulation layer is arranged outside the shell of the stripping devolatilization area (3), the steam phase collection and discharge area (4), the falling film devolatilization area (5), the foam breaking devolatilization area (6) and the material collecting area (7);

and a heat exchange medium flows through the jacket (17).

5. The devolatilizer device as recited in claim 1 wherein,

the discharge hole (8) is arranged on the bottom surface of the material collecting region (7);

The motor set up in devolatilize the device top, the strip that falls is devolatilized the casing top between district (3) and vapour phase collection row district (4) and is provided with and wears axle mouth (12), pivot (11) are passed wear axle mouth (12) and devolatilize the device top the motor is connected.

6. The devolatilizer device as recited in claim 1 wherein,

the discharge hole (8) is arranged on the side surface of the material collecting region (7);

A shaft penetrating port (12) is formed in the top of the shell between the stripping and devolatilization area (3) and the vapor phase collection and discharge area (4), and the rotating shaft (11) penetrates through the shaft penetrating port (12) to be connected with the motor at the top of the devolatilization device; or the bottom surface of the material collecting area (7) is provided with a shaft penetrating opening (12), and the rotating shaft (11) penetrates through the shaft penetrating opening (12) to be connected with the motor at the bottom of the devolatilization device.

7. The devolatilizer device as recited in claim 1 wherein,

The heating device is a shell-and-tube heat exchanger, and the tube layer of the shell-and-tube heat exchanger comprises a plurality of heating tubes (10) which are arranged from top to bottom;

The polymer entering the heating devolatilization area (2) flows downwards along the inner wall surface of the heating array tube (10) and flows out from the lower end opening of the heating array tube (10) to enter the stripping devolatilization area (3).

8. The devolatilizer device as recited in claim 7 wherein,

The interior of the heating tube array (10) is empty or provided with an insert;

The inner insert is at least two connected spiral sheets, the spiral sheets are twisted by 180 degrees and welded with the heating tube array (10) body in the spiral line direction, the rotating directions of the adjacent spiral sheets are opposite, the central points of the adjacent spiral sheets are connected, and the angle between the central points is 90 degrees.

9. The devolatilizer device as recited in claim 1 wherein,

the material collecting area (7) is provided with a material pushing spiral (16) used for pushing the polymer to move downwards, and the material pushing spiral (16) is fixedly connected with the rotating shaft (11).

10. The devolatilizer device as recited in claim 1 wherein,

the liquid collecting distributor (14) is spherical or umbrella-shaped.