CN217796146U - Tower core internal member, tower core and purifying tower - Google Patents

Abstract

The utility model discloses a tower core inner member, tower core and purifying tower. The tower core internal component comprises an equilizer and at least one guide plate; the distributor is of a structure with an opening at the bottom, the bottom of the distributor is provided with an opening, and the guide plate is fixedly connected to the bottom of the distributor; the opening corresponds to the guide plate, fluid can flow into the plate surface of the guide plate downwards through the opening of the uniform distributor, the guide plate is provided with a protruding part, and the protruding part is an inverted V-shaped structure formed by mutually connecting two baffles. The utility model discloses a tower core internals can obtain stable controllable liquid film, makes the material realize that great film forming area and faster surface renewal combine together at the flow process. The utility model discloses a tower core through setting up not unidimensional tower core internals, realizes that process dwell time is controllable, and film forming area is big, the film forming form is controllable, no blind spot, surface renewal are fast.

Description

Tower core internal member, tower core and purifying tower

Technical Field

The utility model relates to a tower core inner member, tower core and purifying tower.

Background

In the production of high molecular materials, due to the thermodynamic and kinetic limitations of the polymerization reaction, there is always some residual monomer, solvent or low molecular compound in the polymerization product, and the presence of these residues greatly reduces the quality and properties of the final product. The polymer devolatilization is a technology for removing one or more unreacted monomers, solvents and low-molecular impurities generated in the polymerization process from a polymer system through heating volatilization. The polymer devolatilization is one of the important processes in the production process of high molecular materials, and is a separation engineering problem of thermodynamic and mass transfer control.

Polymer devolatilization is very different from conventional gas-liquid separation processes. The heat and mass transfer processes that accompany devolatilization operations are complex. The polymer devolatilization can be carried out industrially in three different stages, namely flash devolatilization (the stage in which the volatile content in the polymer is reduced from 80% to 20%), bubble devolatilization (the stage in which the volatile content in the polymer is reduced from 20% to 5%) and diffusion devolatilization (the volatile content in the polymer is reduced from below 5% to the final required ppm level). The polymer devolatilization has the following difficulties compared with the traditional gas-liquid separation process. 1. The system viscosity can change in order of magnitude along with the devolatilization process, and can even reach hundreds of thousands of millipascal seconds from tens of millipascal seconds to the end, and the flow behavior is difficult to accurately describe by using a theoretical model; 2. the mass transfer coefficient in the devolatilization process is small, the requirement on the efficiency of separation equipment is high, and the problems that the volume of the separation equipment is huge and the retention time of materials in a devolatilization unit is overlong often exist; 3. the devolatilization operation condition is severe, polymer devolatilization is usually carried out at high temperature, and certain requirements are imposed on the pressure of a system, and under the condition, the polymer is easy to discolor and degrade, so the retention time is not suitable to be too long.

The difficulty of the existing polymer devolatilization is how to strengthen the heat and mass transfer process of low molecular compounds in a foaming stage and a diffusion stage. The devolatilization process is optimized by increasing the devolatilization temperature, reducing the devolatilization pressure and adding a devolatilization agent such as an entrainer or a stripping agent into the system. Devolatilization equipment includes static and dynamic devolatilization equipment. The static equipment comprises a flash evaporator and a falling-strip devolatilizer, and the dynamic equipment mainly comprises a film updating devolatilizer and an extrusion devolatilizer (screw extruder). The new devolatilization technology includes improvements over conventional devolatilizers as well as the design of new devolatilizers. The novel devolatilization technology comprises a falling film devolatilizer, supergravity rotation enhanced devolatilization, supercritical fluid assisted enhanced devolatilization and ultrasonic cavitation enhanced devolatilization.

The existing polymer devolatilization equipment mainly comprises a disc type and a cage frame type horizontal stirring device. The two types of equipment are both used for taking up the melt in the molten pool to form a film and devolatilize the melt when rotating by virtue of rotating equipment with the lower part immersed in a melt layer, the mode is limited by a melt net rack bridge, and a disc or a net piece must keep a larger distance, so that the surface area of the melt in unit volume is insufficient, and the melt film forming efficiency is low; meanwhile, more than one third of melt is positioned at the bottom of the device, the surface updating is limited, and the material at the bottom is influenced by static pressure head, thus being unfavorable for devolatilization; at the same time, due to the self-weight of the stirrer and the mass of the melt adhering to it, the stirrer can flex considerably, the distance of the outer edge of the disk or mesh from the inner wall of the kettle must be sufficient to avoid mechanical accidents, but this distance again leads to dead zones at the bottom of the kettle. When the viscosity of the material is high, the quality of the product is reduced due to side reactions of the material attached to the components in the device for a long time. In addition, the structure is complicated, and the manufacturing and operating costs are high.

The patent CN113999332a utilizes the characteristic of high solubility of volatile in supercritical carbon dioxide, and realizes the removal of volatile by periodically increasing pressure and reducing pressure. This approach allows for lower devolatilization temperatures, greatly reducing the polymer degradation potential, but it imposes severe equipment and operating conditions, increasing the cost of industrial production to some extent. Patent CN101372522A discloses a method for removing volatile matters in a polymer by utilizing supergravity rotation, which enables the supergravity level of a rotor to reach 30-1000 times of standard gravity by adjusting the rotating speed of the rotor, and throws a polymer solution into liquid threads and liquid drops in a filler so as to strengthen heat and mass transfer, and has good devolatilization effect. Patent CN111333834A discloses a devolatilization method of a nylon 6 melt, which realizes devolatilization of the nylon 6 melt through a multi-stage devolatilization reaction kettle and a component collection system, and has the defects of multiple equipment and strict process requirements.

The disclosed vertical devolatilization reactor (a shell-and-tube falling film polycondensation reaction kettle, CN102746499B; a multilayer falling film devolatilization reactor, CN 105903424B) has reduced energy consumption due to no stirrer, and can meet certain production quality requirements for film formation and surface updating, but the flow range of the production materials which can be adjusted is limited, and when the material treatment capacity is increased, the retention time is remarkably reduced, and the product quality is reduced; and multilayer's umbrella skirt structure causes directly falling easily and can't get back to the hollow tube outer wall when falling liquid film in-process material breaks away from the umbrella skirt, forms so-called "short circuit" to make and take off the uneven of wave effect variation and material viscosity, simultaneously, multilayer structure also can cause easily to produce obvious dwell time difference when lower floor's column plate radial flow because of the gradual grow of material viscosity, and then influences and takes off and wave the effect.

Therefore, it is needed to provide a device for removing volatile components, which has large film forming area, controllable film forming shape, no dead zone, fast surface updating, uniform and controllable residence time in the film forming or falling film process, and large flow range adaptability.

SUMMERY OF THE UTILITY MODEL

In order to remove volatile components (including unreacted monomers or low molecular impurities such as raw materials, solvents, byproducts generated by polymerization reaction) the utility model discloses a tower core inner member, a tower core and a purifying tower. The utility model discloses a tower core internals can obtain stable controllable liquid film, makes the material realize great film forming area and very fast surface renewal and combine together at the flow in-process, satisfies the requirement that removes the micromolecule fast among the purification process. The utility model discloses a tower core through setting up not unidimensional tower core internals, realizes that process dwell time is controllable, and film forming area is big, the film forming form is controllable, no blind spot, surface renewal are fast. The utility model discloses a purifying tower simple structure can long-term steady operation, realizes the product stable quality, has effectively reduced the pipeline and has moved the use of equipment.

The utility model provides a tower core internal member, which comprises an equilizer and at least one guide plate;

the distributor is of a structure with an open bottom, the bottom of the distributor is provided with an opening, and the guide plate is fixedly connected to the bottom of the distributor; the trompil with the guide plate corresponds, and fluid can pass through the equipartition ware the trompil flows downwards the face of guide plate, be equipped with the jut on the guide plate, the jut is two baffles interconnect and the structure of falling the V-arrangement that forms.

The utility model discloses in, preferably, the guide plate is followed the lateral wall of equipartition ware extends the setting, better, the equipartition ware with guide plate department has linkage portion, linkage portion can make the fluid pass through the equipartition ware the trompil flows in downwards the outer wall or the internal face of guide plate.

In the present invention, the number of the openings may be 2 to 200, preferably 10 to 80, such as 35.

In the present invention, the diameter of the opening may be 2-300mm, preferably 2-100mm.

The utility model discloses in, guide plate fixed connection in the mode of the bottom of equipartition ware is welded connection.

The utility model discloses in, the mode of trompil can be, the lateral wall of equipartition ware is close to bottom department trompil.

The utility model discloses in, the mode of trompil can be, lateral wall department trompil is close to in the bottom of equipartition ware.

The utility model discloses in, the bottom of equipartition ware can be circular or square, is circular better.

The utility model discloses in, the equipartition ware is equipped with the outer wall better, the height of outer wall can be adjusted, is 20-200mm preferably.

The utility model discloses in, preferably, the bottom surface of equipartition ware is followed the central to peripheral slope, high and the peripheral low slope in the middle of forming for make the solution can flow smoothly the trompil.

In the utility model, the diameter of the uniform distributor can be 300-2000mm, preferably 300-700 mm.

In the present invention, the angle formed by the deflector and the axial direction of the distributor may be 10 ° to 175 °, preferably 30 ° to 150 °, more preferably 35 ° to 60 °, for example 30 °, 35 ° or 45 °. In the structure of the included angle formed by the guide plate and the axial direction of the uniform distributor, liquid can flow downwards along the guide plate under the action of gravity.

The utility model discloses in, tower core internals can be the toper structure, works as the guide plate with the axial direction of equipartition ware forms the contained angle between 0-90 and arranges when the bottom of equipartition ware, equipartition ware and range constitute the toper between the guide plate.

In the utility model, the inner component of the tower core can be in an inverted cone structure; when the guide plates and the axial direction of the uniform distributor form an included angle of 90-180 degrees and are arranged at the bottom of the uniform distributor, an inverted cone is formed between the uniform distributor and the arranged guide plates.

The utility model discloses in, the guide plate can be based on the structure of equipartition ware sets up to square or fan-shaped.

In the present invention, the number of the flow guide plates on one of the distributors may be 2 to 30, preferably 4 to 12. When the number of the guide plates is more than 1, a plurality of the guide plates are connected with each other but liquid channeling is not performed between the plates.

In the present invention, the protrusion is a portion protruding upward along the surface of the guide plate.

In the present invention, the included angle range of the inverted V-shaped structure of the protrusion is greater than or equal to 10 °, and less than 180 °, preferably 10 ° -90 °, for example 60 °. When the material flows through the protruding part on the guide plate, the direction of the fluid is changed to redistribute, and the inside of the material forms bubbles under the action of the surface microstructure of the protruding part, and the bubbles nucleate, grow, combine and break in the flowing process to strengthen devolatilization.

The utility model discloses in, the quantity of jut can be according to the equipartition number of guide plate is decided, after each equipartition the quantity of jut on the guide plate can be 1-50.

In the present invention, the height of the protrusion perpendicular to the guide plate may be 2-300mm, preferably 10-100mm, and more preferably 10-30mm.

In the present invention, preferably, the surface of the baffle of the protrusion is provided with a small member, such as an agnail, a saw tooth, a grid plate or a flow guide wire.

The utility model provides a tower core, it includes frame, porous distributor and as above-mentioned tower core internals, the quantity of tower core internals is more than two, tower core internals from the top down distributes in proper order, porous distributor and material inlet pipe connection locate the top one the top of tower in-core components, equipartition ware activity or fixed connection are in the frame of tower core.

In the present invention, the number of the members in the tower core may be 2-200, preferably 1-100, and more preferably 5-30.

The utility model discloses in, from the top down sets gradually in the tower core internals, every on the equipartition ware the quantity of guide plate down increases from the top in proper order.

The utility model discloses in, from the top down sets gradually among the tower core internals, tower in-core internals from the top down is toper structure and back taper structure in proper order.

The utility model discloses in, from the top down sets gradually among the tower core internals, adjacent two-layer the interval of tower core internals increases gradually, for example increases gradually to 2000mm from 100mm, increases gradually to 500mm from 100mm or increases gradually to 700mm from 150 mm.

The utility model discloses in, from the top down sets gradually in the tower core inner member, the equipartition ware bottom the diameter of trompil crescent, for example from 5mm increase gradually to 30mm, from 5mm increase gradually to 20mm, or from 5mm increase gradually to 25mm. In the tower core inner member arranged from top to bottom, the number of the openings is gradually increased, for example, is increased from 18 to 80, 18 to 46 or 24 to 48.

The utility model discloses in, preferably, the tower core still is including the mist eliminator of locating the top.

The utility model discloses in, the equipartition ware with the swing joint mode of frame generally does, the equipartition ware with the frame passes through the connecting piece and links to each other, preferably, the connecting piece is the stainless steel pendant, the equipartition ware passes through the stainless steel pendant preferably hang in on the frame.

The utility model discloses in, the uniform distributor with the fixed connection mode of frame does the uniform distributor weld in on the frame.

In a preferred embodiment of the present invention, in the tower core internal components sequentially arranged from top to bottom, the number of the guide plates on each distributor increases from top to bottom; in the tower core internals the bottom of equipartition ware is square, the guide plate is followed the lateral wall of equipartition ware extends the setting, the lateral wall of equipartition ware is close to bottom department trompil, be equipped with the jut on the guide plate, the jut is two baffle interconnect and the V-arrangement structure that falls that forms, the bottom surface of equipartition ware is followed central periphery slope, forms the slope that high and peripheral low in the middle of the high and peripheral for make the solution can flow smoothly the trompil.

In another preferred embodiment of the present invention, among the tower core internals arranged in sequence from top to bottom, the tower core internals have a tapered structure and an inverted tapered structure in sequence from top to bottom; the bottom of the uniform distributor in the tower core inner component is circular, the guide plate extends along the side wall of the uniform distributor, and when the tower core inner component is in a conical structure, the side wall of the uniform distributor is provided with a hole close to the bottom; when the inner component of the tower core is in an inverted cone structure, the bottom of the uniform distributor is provided with a hole close to the side wall; the improved water distributor is characterized in that a protrusion is arranged on the guide plate and is an inverted V-shaped structure formed by the mutual connection of two baffles, the protrusion is arranged on the guide plate and is an inverted V-shaped structure formed by the mutual connection of the two baffles, the bottom surface of the uniform distributor inclines towards the periphery along the center to form a slope with high middle and low periphery, and therefore a dissolved body can smoothly flow out of the opening.

The utility model discloses in still provide a purifying column, it includes the casing, and as above-mentioned the tower core.

The utility model discloses in, the casing includes top of the tower, tower body and tower bottom part, and every section all is provided with hot medium entry and hot medium export. The casing is equipped with material import and volatile export, and the bottom of the tower is provided with the material export, porous distributor is connected with the material import through the pipeline. The shell is generally provided with a heating jacket, preferably, the tower top, the tower body and the tower bottom are respectively provided with a heating jacket, and the heating jackets of the tower top, the tower body and the tower bottom can be communicated with each other or can be respectively independent. The heating medium of the heating jacket is one of steam, molten salt and heat conduction oil, and preferably, the heating medium is heat conduction oil.

In the utility model, the material is dispersed from the porous distributor to the distributor of the uppermost tower core inner component, flows into the guide plate through the holes at the bottom of the distributor, and flows downwards along the surface of the guide plate to form a stable film and perform surface updating; after the material is separated from the guide plate, the material flows to a lower tower core inner component under the action of gravity, so that a film is formed on the guide plate, a gravity falling film is formed between the two tower core inner components, and the film forming area is increased more efficiently; and finally discharging the material from a tower bottom outlet.

The utility model discloses in still provide a purification method, adopt as above-mentioned the purifying column, purification method includes following step:

s1, dispersing materials from the porous distributor to the uniform distributor of the inner member of the tower core at the uppermost layer, flowing into the guide plate through the opening holes and flowing through the protrusions on the guide plate;

s2, flowing to the inner components of the tower core of the next layer in sequence;

and S3, collecting effluent liquid from a liquid outlet below the purification tower.

Wherein the effluent of step S3 may be a melt or a solution.

In the present invention, the material in step S1 is preferably a product containing a high molecular polymer formed by a polycondensation process of a monomer; the high molecular polymer-containing product preferably includes a volatile component preferably including a monomer not participating in a reaction, a low molecular polymer or a solvent, and the high molecular polymer preferably including polycarbonate, polyamide, polyolefin, polyester, polyurethane or polymethyl methacrylate.

Wherein the polyester preferably comprises polyethylene terephthalate, polytrimethylene terephthalate or polybutylene terephthalate.

Wherein the polyamide preferably comprises polyamide 6, polyamide 5X or polyamide 6X, the polyamide 5X preferably comprises polyamide 56, polyamide 510, polyamide 512, polyamide 513 or polyamide 516; the polyamide 6X preferably comprises polyamide 66, polyamide 610, polyamide 612, polyamide 613 or polyamide 616.

The utility model discloses in, for making the volatile desorption as far as possible, the purifying column generally keeps high temperature and high vacuum operation environment. The pressure of the purification tower can be controlled by adjusting a frequency converter of the vacuum unit.

In the utility model, the pressure of the purification tower is preferably 5-10 Bar, more preferably 5-100 mBar.

In the present invention, the temperature of the purification tower is preferably 160 ℃ to 350 ℃, more preferably 210 ℃ to 335 ℃.

In the present invention, when the high molecular polymer is polyamide, the pressure of the purification tower is preferably 5-30 mBar; the temperature of the purification column is preferably 270 to 335 ℃.

In the present invention, when the high molecular polymer is polycarbonate, the pressure of the purification tower is preferably 5-50 mBar; the temperature of the purification column is preferably 260-320 ℃.

In the present invention, preferably, the mass ratio of the volatile component in the melt of the product containing the high molecular polymer is 0.1% to 55%, more preferably 0.1% to 30%.

The number of internals in the core can be increased or decreased depending on the different requirements on the content of volatile components in the polymer after devolatilization or on the melt throughput of the polymer.

The utility model discloses in still provide one kind as above-mentioned the application of purifying column in polycondensation technology, solvent devolatilization, desorption low molecular product's reaction process, vacuum evaporation or analytic operation process. The product of the polycondensation process preferably includes a volatile component, which preferably includes unreacted monomers, low molecular weight polymers, or solvents, and the high molecular weight polymer, which preferably is a polycarbonate, a polyamide, a polyolefin, a polyester, a polyurethane, or a polymethylmethacrylate.

Wherein the polyester preferably comprises polyethylene terephthalate, polytrimethylene terephthalate or polybutylene terephthalate.

Wherein the polyamide preferably comprises polyamide 6, polyamide 5X or polyamide 6X. The polyamide 5X preferably comprises polyamide 56, polyamide 510, polyamide 512, polyamide 513 or polyamide 516. The polyamide 6X preferably comprises polyamide 66, polyamide 610, polyamide 612, polyamide 613 or polyamide 616.

On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.

The reagent and the raw materials used by the utility model are available on the market.

The utility model discloses an actively advance the effect and lie in:

(1) The utility model discloses a tower core internals, through setting up the guide plate internals of bellying, make the material need not plus mechanical force, only just can obtain stable controllable liquid film under the action of gravity, the existence of bellying can the flow overall arrangement of effective control, makes the material realize great membrane area of becoming and very fast surface renewal combining together at the flow in-process, satisfies the purification including taking off the requirement that the in-process removed the micromolecule fast.

(2) The utility model discloses a tower core through setting up the tower core internals of the not unidimensional that suits with system's rerum natura change, makes polymer fluid form stable falling liquid film flow under the action of gravity, realizes the combination of great membrane area and faster surface renewal all the time, realizes that process dwell time is controllable, and the membrane area is big, the membrane form is controllable, no blind spot, surface renewal are fast.

(3) The purification tower of the utility model adopts an integral vertical compact structure, does not need any stirring equipment, and avoids the problems of shaft seal and the like; the structure is simple; the method has a series of advantages that the whole flow in the tower tends to plug flow, no radial back mixing, no external power, energy consumption saving and the like; has wide application range and can be used for the polycondensation reaction or the devolatilization process of materials with the viscosity of 0.2mPas-2000 Pas. The purification method of the utility model is simple, and can effectively remove low molecular impurities such as unreacted monomers or by-products generated by raw materials, solvents and polymerization reaction. The utility model discloses an in-process of polymer polycondensation is being applied to the purifying column, can make viscosity, the molecular weight promotion of polymer simultaneously, satisfies the product quality requirement.

Drawings

Fig. 1 is a schematic view of a purification tower according to embodiment 1 of the present invention.

Fig. 2 is a schematic view of another purification tower of the present invention.

FIG. 3 is a schematic view showing a structure in which stainless steel barbs are attached to the surface of a projection in example 1.

FIG. 4 is a schematic view showing a structure in which a serrated steel bar is attached to the surface of a protrusion in example 2.

FIG. 5 is a schematic view showing a structure in which stainless steel wires are attached to the surface of the protrusion according to example 3.

FIG. 6 is a schematic view showing the structure of the protrusion having a grid plate attached to the surface thereof in example 1.

FIG. 7 is a schematic structural view of the applicator of embodiment 1.

Description of reference numerals:

volatile matter outlet A

Material inlet B

C1 C2 and C3 are all heat medium inlets

D1 D2 and D3 are both heat medium outlets

Material outlet E

Tower top jacket 1

Tower body jacket 2

Tower kettle jacket 3

Outer frame 4

Porous distributor 5

Uniform distributor 6

Flow guide plate 7

Protrusion 8

Stainless steel barb 9

Serrated steel bar 10

Stainless steel flow guide wire 11

Grating 12

Detailed Description

The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.

A purification tower, as shown in figure 1, comprises a shell and a tower core, wherein the shell consists of a tower top, a tower body and a tower bottom, and each section is provided with a heat medium inlet C1, C2 and C3 and a heat medium outlet D1, D2 and D3. The casing is equipped with material import B and volatile export A, and the bottom of the tower is provided with material export E, and porous distributor 5 is connected with material import B through the pipeline.

The top, the tower body and the bottom of the shell are all provided with heating jackets, namely a tower top jacket 1, a tower body jacket 2 and a tower kettle jacket 3, and the heating medium of the heating jackets is heat-conducting oil.

The tower core comprises an outer frame 4, a porous distributor 5 and a tower core internal member, wherein the tower core internal member comprises an even distributor 6 and a plurality of guide plates 7; the components in the tower core are distributed from top to bottom in sequence, the porous distributor 5 is connected with a material inlet pipeline and arranged above the top component in the tower core, and the uniform distributor 6 is hung on the outer frame 4 through a stainless steel hanger. The tower core also comprises a mist eliminator arranged at the top.

The guide plate 7 extends along the side wall of the uniform distributor 6, the uniform distributor 6 corresponds to the guide plate 7, and fluid can flow into the outer wall surface or the inner wall surface of the guide plate 7 downwards through the opening of the uniform distributor 6. The opening corresponds to the guide plate 7, fluid can flow into the plate surface of the guide plate 7 downwards through the opening of the uniform distributor 6, the guide plate 7 is provided with a protruding part 8, and the protruding part 8 is an inverted V-shaped structure formed by mutually connecting two baffles. In the tower core internal components which are sequentially arranged from top to bottom, the tower core internal components are sequentially in a conical structure and an inverted conical structure from top to bottom.

The uniform distributor 6 is of a structure with an open bottom, and the bottom of the uniform distributor 6 is circular; and the equilizer 6 is provided with an outer wall. As shown in FIG. 7, the bottom surface of the distributor 6 is inclined from the center to the periphery to form slopes of high in the middle and low in the periphery for allowing the solution to smoothly flow out of the opening. In the tower core internal member with a conical structure, a hole is formed on the side wall of the uniform distributor 6 close to the bottom; in the tower core internal member in the shape of an inverted cone, the bottom of the uniform distributor 6 is provided with a hole close to the side wall.

Fig. 2 is another purification tower, which has a structure similar to that of the purification tower in fig. 1, and the inner components of the tower core are all provided with holes on the side wall of the uniform distributor 6 near the bottom. The difference is that the bottom of the uniform distributor 6 is rectangular, the guide plates 7 extend along the side walls of the uniform distributor 6, and the guide plates 7 of each layer can extend like a wood board in a flat manner; in the tower core internal components which are arranged from top to bottom in sequence, the number of the guide plates 7 on each uniform distributor 6 is increased from top to bottom in sequence.

Example 1

The purification tower shown in FIG. 1 specifically comprises: the number of the components in the tower core is 10-30 (namely the number of the layers of the components in the tower core is 10-30); in the tower core internal components arranged from top to bottom, the diameter of the uniform distributor 6 is increased from 300mm to 2000mm. The distance between the inner members of the tower cores of two adjacent layers is gradually increased from 100mm to 2000mm in the inner members of the tower cores which are arranged from top to bottom in sequence; the diameter of the opening at the bottom of the uniform distributor 6 is gradually increased from 5mm to 30mm. In the tower core internals arranged in sequence from top to bottom, the number of openings increases progressively, for example from 18 to 80. The number and the diameter of the openings of the uniform distributor 6 are gradually increased, and the distance between the inner members of the two adjacent layers of tower cores is also gradually increased so as to adapt to the change of fluid viscosity and liquid level in the flowing process of the polymer fluid and meet the requirements of flowing and surface updating.

The guide plate 7 is fan-shaped. Each layer of the guide plates 7 is divided into 10 blocks, and the guide plates 7 are connected with each other, but liquid channeling is not performed among the plates. The length of the guide plate 7 is 100mm to 500mm, and the upper and lower arc lengths are determined according to the diameter of the uniform distributor 6 and the length of the guide plate 7. The angle formed by the deflector 7 and the axial direction of the homogenizer 6 is 30 °. The height of the protruding part 8 vertical to the guide plate 7 is 10-30mm.

The angle of the inverted V-shaped configuration of the protrusion 8 is in the range of 60 °. As shown in fig. 3, the surface of the baffle of the protrusion 8 is provided with stainless steel barbs 9. The surface of the baffle of the protrusion 8 may also be provided with louvers 12 as shown in fig. 6.

A purification method is applied to the devolatilization process of polymers, and adopts the purification tower, and the purification method comprises the following steps:

firstly, the vacuum degree in the tower is adjusted to meet the process requirements by a vacuum pump, the temperature of the hot medium in the heating jacket is adjusted to the set temperature of the process, and then the polymer melt is introduced into the purification tower.

S1, dispersing polymer on a uniform distributor 6 of a tower core internal member at the uppermost layer from a porous distributor 5, flowing into a guide plate 7 through an opening, and flowing through a protrusion part 8 on the guide plate 7;

s2, sequentially flowing to the tower core inner components of the next layer;

s3, collecting effluent liquid from a material outlet E below the purification tower.

For each distributor 6, when the polymer melt begins to accumulate, the material outflow rate of the film-forming flow is smaller than the material inflow rate, the liquid holdup of the distributor 6 rises, and the liquid level height increases, so that the material flow rate of the layer flowing into the guide plate 7 through the opening at the bottom of the distributor 6 increases along with the increase of the liquid holdup, until the material outflow rate of the film-forming flow is equal to the material inflow rate, the flow rate is stable, and the liquid holdup is also stable; on the contrary, if the material outflow rate of the film forming is greater than the material inflow rate, the liquid holdup in the uniform distributor 6 is reduced, and the liquid level height is also reduced, so that the material flow rate of the layer flowing into the guide plate 7 through the opening at the bottom of the uniform distributor 6 is reduced along with the reduction of the liquid holdup until the material outflow rate of the film forming flow is equal to the material inflow rate, the flow rate is stable, and the liquid holdup can be balanced at the moment. Thus, each layer of the equipartition device 6 forms a stable liquid hold-up, forming a dynamic equilibrium, when the whole system is in steady state operation. The surface of the polymer melt is constantly renewed during the formation of a film on the deflector 7 and the falling film formed during the free fall of the falling deflector 7. The low-molecular volatile components are continuously removed from the surface of the gas-liquid in the vacuum environment, and are converged to the top of the tower through the gap between the tower core and the shell, and then are pumped out of the purification tower. When the polymer melt passes through one layer of tower core, the volatile matter in small molecule is eliminated, so that the viscosity, molecular weight and other physical properties of the polymer melt are increased continuously during the downward flow of the polymer melt until reaching the physical property requirement and the polymer melt is discharged from the material outlet in the tower bottom.

Example 2

The purification tower of example 2 is similar to that of example 1 in structure, and is different in that, in the tower core internal components arranged in sequence from top to bottom, the diameter of the uniform distributor 6 increases from 350 to 700mm, the number of the bottom openings increases from 18 to 46 from top to bottom, the diameter of the openings increases from 5mm to 20mm from top to bottom, the number of the tower core internal components is 14 (namely the number of layers is 14), the distance between the adjacent two layers of internal components increases from 100mm to 500mm in sequence from top to bottom, the flow guide plate 7 is designed as shown in fig. 1, each layer of flow guide plate 7 is divided into 10 pieces, the length of the flow guide plate 7 is different from 100mm to 500mm, and the upper and lower arc lengths are determined according to the diameter of the uniform distributor 6 and the length of the flow guide plate 7. The angle formed by the deflector 7 and the axial direction of the distributor 6 is 35 deg.. The height of the protrusion 8 perpendicular to the baffle 7 is 15mm. As shown in fig. 4, the surface of the dam of the protrusion 8 is provided with a serrated steel bar 10.

The purification method is applied to the polycondensation process of the polycarbonate, adopts the purification tower and comprises the following steps: firstly, the vacuum degree in the tower is adjusted to 7mBar by a vacuum pump, the temperature of a hot medium in a heating jacket is adjusted to 315 ℃, and then a polycarbonate melt is introduced into a purification tower.

S1, dispersing polycarbonate from a porous distributor 5 to a uniform distributor 6 of a tower core internal member at the uppermost layer, flowing into a guide plate 7 through an opening, and flowing through a protrusion part 8 on the guide plate 7;

s2, flowing to the inner components of the tower core of the next layer in sequence;

s3, collecting the melt from a material outlet E below the purification tower.

The purification principle is similar to that of example 1, and the physical properties such as viscosity and molecular weight of the polycarbonate melt are increasing during the downward flow. The molecular weight of the polycarbonate melt raw material is 14000-15000, the volatile content is 1.7%, and the molecular weight of the discharged polycarbonate melt is 25000-26000, and the volatile content is 0.05%. The physical property requirements are met.

Example 3

The purification tower of embodiment 3 is similar to the purification tower of embodiment 1 in structure, and is different in that, among the tower core internal components arranged in sequence from top to bottom, the diameter of the uniform distributor 6 is increased from 350 to 750mm, the number of the bottom openings is increased from 24 to 48 from top to bottom, the diameter of the openings is increased from 5mm to 25mm from top to bottom, the number of the tower core internal components is 18 (namely, the number of layers is 18), the distance between the adjacent two layers of internal components is increased from 150mm to 700mm in sequence from top to bottom, the flow guide plate 7 is designed as shown in fig. 1, each layer of flow guide plate 7 is divided into 12, the length of the flow guide plate 7 is different from 150mm to 600mm, and the upper and lower arc lengths are determined according to the diameter of the uniform distributor 6 and the length of the flow guide plate 7. The axial direction of the deflector 7 and the uniform distributor 6 is 45 degrees. The height of the protrusion 8 perpendicular to the baffle 7 is 13mm. As shown in fig. 5, the surface of the baffle plate of the protrusion 8 is provided with stainless steel guide wires 11.

The purification method is applied to the devolatilization process of polyamide 6, and adopts the purification tower, and the purification method comprises the following steps: firstly, the vacuum degree in the tower is adjusted to 5mBar by a vacuum pump, the temperature of a heat medium in a heating jacket is adjusted to 280 ℃, and then the polyamide 6 melt is introduced into a purification tower.

S1, polyamide 6 is dispersed on a uniform distributor 6 of a tower core internal member at the uppermost layer from a porous distributor 5, flows into a guide plate 7 through an opening, and flows through a protrusion part 8 on the guide plate 7;

s2, sequentially flowing to the tower core inner components of the next layer;

s3, collecting the melt from a material outlet E below the purification tower.

The purification principle is similar to that of example 1, and the physical properties such as viscosity and molecular weight of the polyamide 6 melt are increasing during the downward flow process. The melt material viscosity is 300-350 Pa.s, the volatile content is 2-5%, the viscosity of the discharged polyamide 6 melt is 1500-1700 Pa.s, and the volatile content is 0.03%. The physical property requirements are met.

Claims (10)

1. A tower core internal member is characterized by comprising an equilizer and at least one guide plate;

the distributor is of a structure with an open bottom, the bottom of the distributor is provided with an opening, and the guide plate is fixedly connected to the bottom of the distributor; the opening corresponds to the guide plate, so that fluid can flow into the plate surface of the guide plate downwards through the opening of the uniform distributor, the guide plate is provided with a protruding part, and the protruding part is an inverted V-shaped structure formed by mutually connecting two baffles.

2. The tower core internals according to claim 1, wherein the baffles satisfy one or more of the following conditions:

(1) the guide plates extend along the side walls of the uniform distributors;

(2) the shape of the guide plate is square or fan-shaped;

(3) the number of the guide plates on a single uniform distributor is 2-30;

(4) the number of the protrusions on a single baffle is 1-50.

3. The tower core internals according to claim 1, wherein said equipartition device satisfies one or more of the following conditions:

(1) the number of the openings is 2-200;

(2) the diameter of the opening is 2-300mm;

(3) the guide plates are fixedly connected to the bottom of the uniform distributor in a welding mode;

(4) the holes are formed in a mode that the side wall of the uniform distributor is provided with a hole close to the bottom or the bottom of the uniform distributor is provided with a hole close to the side wall;

(5) the bottom of the uniform distributor is round or square;

(6) the uniform distributor is provided with an outer wall;

(7) the bottom surface of the uniform distributor inclines towards the periphery along the center to form a slope with a high middle part and a low periphery, so that the solution can smoothly flow out of the open pore;

(8) the diameter of the uniform distributor is 300-2000mm;

(9) the included angle formed by the guide plate and the axial direction of the uniform distributor is 10-175 degrees.

4. The tower core internals according to claim 1, wherein the tower core internals are of a conical configuration, wherein the distributors are tapered with respect to the arrangement of the baffles when the baffles form an angle of between 0 ° and 90 ° with respect to the axial direction of the distributors and are arranged at the bottom of the distributors;

or the tower core internal member is of an inverted cone structure; when the guide plates and the axial direction of the uniform distributor form an included angle of 90-180 degrees and are arranged at the bottom of the uniform distributor, an inverted cone is formed between the uniform distributor and the arranged guide plates.

5. A tower core internals according to claim 1, wherein said protrusions fulfill one or more of the following conditions:

(1) the included angle range of the inverted V-shaped structure of the protrusion part is more than or equal to 10 degrees and less than 180 degrees;

(2) the height of the protrusion part perpendicular to the guide plate is 2-300mm;

(3) the surface of the baffle of the protrusion is provided with a member.

6. A tower core, characterized in that, it includes the outer frame, the porous distributor and the inner member of the tower core according to any one of claims 1-5, the number of the inner member of the tower core is more than two, the inner member of the tower core distributes from top to bottom in turn, the porous distributor is connected with the material inlet pipeline, locate above the inner member of the tower core of the uppermost layer, the uniform distributor is connected to the outer frame movably or fixedly.

7. The tower core of claim 6, wherein the tower core internals satisfy one or more of the following conditions:

(1) the number of the components in the tower core is 2-200;

(2) in the tower core internal components which are sequentially arranged from top to bottom, the number of the guide plates on each uniform distributor is sequentially increased from top to bottom; the bottom of the uniform distributor in the tower core internal component is square, the guide plate extends along the side wall of the uniform distributor, the side wall of the uniform distributor is provided with a hole close to the bottom, the guide plate is provided with a protruding part, the protruding part is an inverted V-shaped structure formed by connecting two baffles, the bottom surface of the uniform distributor inclines towards the periphery along the center to form a slope with high middle and low periphery, and the slope is used for enabling the solution to smoothly flow out of the hole;

(3) the tower core internal components are sequentially arranged from top to bottom and sequentially have a conical structure and an inverted conical structure from top to bottom; the bottom of the uniform distributor in the tower core internal component is circular, and the guide plate extends along the side wall of the uniform distributor; when the component in the tower core is in a conical structure, the side wall of the uniform distributor is provided with a hole close to the bottom; when the inner component of the tower core is in an inverted cone structure, the bottom of the uniform distributor is provided with a hole close to the side wall; the flow guide plate is provided with a protruding part which is an inverted V-shaped structure formed by connecting two baffles, the protruding part is arranged on the flow guide plate and is an inverted V-shaped structure formed by connecting the two baffles, the bottom surface of the uniform distributor inclines towards the periphery along the center to form a slope with a high middle part and a low periphery, and the slope is used for enabling the solution to smoothly flow out of the opening; (4) the distance between every two adjacent tower core inner components is gradually increased in the tower core inner components which are sequentially arranged from top to bottom;

(5) in the tower core internal components which are sequentially arranged from top to bottom, the diameter of the opening at the bottom of the uniform distributor is gradually increased; the number of the openings is gradually increased;

(6) the uniform distributor and the outer frame are movably connected in a way that the uniform distributor is connected with the outer frame through a connecting piece;

(7) the uniform distributor is fixedly connected with the outer frame in a mode that the uniform distributor is welded on the outer frame.

8. A purification tower comprising a shell, further comprising the core of claim 6 or 7.

9. The purification tower of claim 8, wherein the housing comprises a tower top, a tower body and a tower bottom portion, the housing is provided with a material inlet and a volatile outlet, and the tower bottom is provided with a material outlet; the shell is provided with a heating jacket.

10. The purification column according to claim 9, wherein the top of the column, the column and the bottom of the column are provided with heating jackets, and the heating jackets of the top of the column, the column and the bottom of the column are in communication with each other or independent of each other.

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