CN115624949A - Horizontal tube-to-tube falling film melt polycondensation method and reactor - Google Patents

Horizontal tube-to-tube falling film melt polycondensation method and reactor Download PDF

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Publication number
CN115624949A
CN115624949A CN202211129665.3A CN202211129665A CN115624949A CN 115624949 A CN115624949 A CN 115624949A CN 202211129665 A CN202211129665 A CN 202211129665A CN 115624949 A CN115624949 A CN 115624949A
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falling film
horizontal
pipes
tube
heat medium
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陈世昌
陈文兴
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Zhejiang Sci Tech University ZSTU
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Zhejiang Sci Tech University ZSTU
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/24—Stationary reactors without moving elements inside
    • B01J19/2475—Membrane reactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0006—Controlling or regulating processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0006—Controlling or regulating processes
    • B01J19/0013—Controlling the temperature of the process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0053—Details of the reactor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/24—Stationary reactors without moving elements inside
    • B01J19/2415—Tubular reactors
    • B01J19/2425—Tubular reactors in parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/24—Stationary reactors without moving elements inside
    • B01J19/247—Suited for forming thin films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00076—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements inside the reactor
    • B01J2219/00081—Tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
    • B01J2219/00094—Jackets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00164—Controlling or regulating processes controlling the flow

Abstract

The invention discloses a method for melt polycondensation of falling films between horizontal pipes, wherein molten materials flow in a curtain-shaped falling film in a gap between two adjacent horizontal pipes, and then are subjected to melt polycondensation reaction between the horizontal pipes of the next layer, finally slide and converge to the bottom of a reactor for further reaction, mixing and homogenization, and finally discharge is finished after the reaction. The polycondensation reactor for implementing the method is of an integral vertical structure and comprises a vertical tower body, an end enclosure provided with a material chamber, a bottom shell provided with a stirrer and the like, wherein the reactor is provided with two or more groups of falling film elements which are vertically arranged in parallel by a plurality of transverse pipes and are connected with vertical pipes at two ends, the falling film elements are vertically arranged, and two transverse pipes which are vertically adjacent in the falling film elements and two groups of falling film elements which are adjacent on the same horizontal position form a related structure. The reactor has small flow resistance, large film forming area of materials and wide flow application range, and can be applied to the production of preparing polymers by melt polycondensation.

Description

Horizontal tube-to-tube falling film melt polycondensation method and reactor
Technical Field
The invention relates to a horizontal tube-to-tube falling film melt polycondensation method and a reactor thereof for melt polycondensation, belonging to the technical field of material and chemical production.
Background
Polycondensation plays an important role in the synthesis of high polymer materials, and the polycondensation reaction is mostly used for synthesizing the azanyl polymers such as polyester, polyamide, phenolic resin, epoxy resin, alkyd resin and the like. The polycondensation reaction is carried out by melt polycondensation, how long a solid phase is present, solution polymerization, interfacial polycondensation, and the like, among which melt polycondensation is one of the most common methods. Because of the reversibility of melt polycondensation, the by-products need to be removed by decompression or other means during the implementation process, so that the reaction moves towards the polymer direction. Particularly, in the preparation of high molecular weight polycondensates, the melt viscosity is high, the removal of small molecular by-products is difficult, the surface renewal frequency and the mass transfer area of materials need to be improved, and the key point of the implementation is a melt polycondensation reactor. The ideal polycondensation reactor can realize the flow of material in a manner close to that of plug flow, has high surface renewal frequency, uniform heat and mass transfer, high transfer area, narrow residence time distribution and no dead zone in flow, and thus can realize high-efficiency devolatilization to obtain the polycondensation product with uniform quality.
Among the existing polycondensation reactors, the disc reactor is widely applied in industry due to the advantages of high stirring power inside the disc reactor, large-capacity production and the like, but the stirring shaft of the disc reactor generates deflection after long-term operation, the shaft seal is more and more difficult, the wall of the kettle is easy to residue materials to coke, and the disc reactor cannot be applied to the production of high-viscosity high-molecular-weight polymer products (such as polyester bottle flakes and polymer melts for industrial fibers).
Disclosure of Invention
The first purpose of the invention is to provide a horizontal tube-to-tube falling film melt polycondensation method aiming at the defects of the prior art, which can ensure that the material has high film forming efficiency, uniform flow, high surface renewal frequency, high devolatilization efficiency and obvious tackifying effect, and finally realize the preparation of high-quality polymers. Therefore, the invention adopts the following technical scheme:
a horizontal tube-to-tube falling film melt polycondensation method is characterized in that: the method is provided with two or more groups of falling film elements which are vertically arranged in parallel by a plurality of transverse pipes and are connected with vertical pipes at two ends, the transverse pipes at the same horizontal position in two adjacent groups of falling film elements are also related with the two transverse pipes vertically adjacent in the same group of falling film elements, molten materials flow to the transverse pipes corresponding to the two adjacent groups of falling film elements in a curtain-shaped falling film in the gaps between the transverse pipes at the same horizontal position in the two adjacent groups of falling film elements, and finally fall and converge to the bottom of the reactor for further reaction, mixing and homogenization, and discharging after the reaction is finished.
The invention also aims to provide a falling film melt polycondensation reactor using the method, and the invention adopts the following technical scheme for the purpose:
a falling film melt polycondensation reactor between horizontal pipes comprises a vertical tower body, a seal head and a bottom shell, wherein a vacuum extraction opening is arranged on the vertical tower body; the reactor is provided with a material inlet, and the bottom shell is provided with a material outlet; the upper portion of reactor sets up the material room, its characterized in that: the reactor is provided with two or more groups of falling film elements which are arranged in parallel from top to bottom by a plurality of transverse pipes, and the two ends of the falling film elements are connected with vertical pipes;
the method is characterized in that a molten material enters between two horizontal pipes at the same horizontal position on two adjacent groups of falling film elements after being distributed from a film distribution plate, the two adjacent groups of falling film elements are related, the two adjacent horizontal pipes on the same group of falling film elements are also related, the material is converged between the two horizontal pipes at the same horizontal position of the two adjacent groups of falling film elements and becomes curtain falling film flowing from a pipe gap to a pipe gap of the two corresponding horizontal pipes below, and therefore the melt is subjected to melt polycondensation reaction when the two pipe gaps flow and the falling film moves between the upper horizontal pipe and the lower horizontal pipe.
Furthermore, be provided with a plurality of cloth membrane holes for every adjacent two violently pipes in its below on the cloth membrane board, the projection of cloth membrane hole along the tower body direction is located between two violently pipe axis.
Further, in the horizontal tube layers, namely the horizontal tubes at the same height, the ratio of the tube spacing between the two horizontal tubes of adjacent falling film elements (the distance between the top ends of the adjacent sides of the two adjacent horizontal tubes) to the diameter of the circumscribed circle of the horizontal tubes is 0.1 to 10, and the ratio of the layer spacing between the upper and lower adjacent horizontal tube layers (the distance between the upper and lower ends of the outer wall of the upper and lower adjacent horizontal tubes) to the outer diameter of the tubes is 1 to 500.
Further, from top to bottom, the same layer is violently managed the pipe interval and is the same or progressively increase, and the pipe interval of the horizontal pipe of top layer is 1 with the pipe interval's of the horizontal pipe of bottom ratio: 1 to 5; and/or, from top to bottom, the interlamellar spacing between layers is the same or progressively increases, and the interlamellar spacing at the top is 1 with the interlamellar spacing at the bottom: 1 to 20.
Furthermore, the upper part of the transverse pipe is in a convex arc shape or a triangular shape, and the cross section of the transverse pipe can be in a circular shape, an oval shape, an egg shape, a polygonal shape and the like.
Further, the transverse tube may be a corrugated tube.
Further, the tube diameter of the transverse tube in the falling film element is unchanged or gradually reduced from top to bottom.
Furthermore, the reactor is provided with a heat preservation and heat transfer system, an upper heat medium chamber, a lower heat medium chamber, a heat medium inlet and a heat medium outlet are arranged in the end socket, and the material chamber is positioned below the lower heat medium chamber; the vertical tower body and the bottom shell are respectively provided with a tower body jacket and a bottom shell jacket; an upper top plate of the material chamber is a bottom plate of a lower heat medium chamber, a vertical pipe on one side of the falling film element penetrates through the material chamber and the lower heat medium chamber to be communicated with the upper heat medium chamber, a vertical pipe on the other side of the falling film element penetrates through the material chamber to be communicated with the lower heat medium chamber, and a heat medium enters the upper heat medium chamber, flows through the vertical pipe on one side of the falling film element, is shunted to enter a transverse pipe layer, then flows through the vertical pipe on the other side, flows to the lower heat medium chamber and flows out from a heat medium outlet on the end enclosure; the heat medium of the heat transfer and insulation system circulates to the outside and circulates after being heated or cooled.
Through the structural parameter and the interval of regulation and control material flow, adjacent two sets of violently pipes, make the material get into two sets of levels of same height and violently manage between the back, rely on gravity to flow out from the gap between two sets of violently pipes and carry out the blanking motion of drawing the diaphragm type, assemble again to between two adjacent horizontal pipes of next one deck. The skillfully designed tube-to-tube falling film structure can effectively promote the uniform mixing of the melt, the film-forming efficiency and the mass transfer area are improved by utilizing the self-weight to carry out film-drawing movement, the small molecular compound in the melt polycondensation system is removed at a high speed, and a high-quality high-viscosity melt polycondensation product can be obtained.
Drawings
FIG. 1 is a schematic view of a horizontal tube-to-tube falling film melt polycondensation reactor of the present invention.
Fig. 2 is a material falling film flow diagram between two adjacent groups of transverse pipes.
Fig. 3 is a schematic diagram of the relative position arrangement of the film distribution holes relative to the two groups of transverse tubes.
Parts, positions and numbers in the figures: the device comprises a heating medium inlet 1, a feeding pipe 2, a heating medium inflow box 3, a heating medium outflow box 4, a heating medium box outflow box upper cover plate 41, a heating medium box outflow box lower bottom plate 42, a material chamber 5, a film distribution plate 51, a film distribution hole 511, a tower jacket heating medium inlet 6, a vertical shell 7, a tower jacket 8, a bottom shell flange 9, a bottom shell bolt 10, a bottom shell jacket heating medium inlet 11, a bottom shell 12, a bottom shell jacket 13, a material outlet 14, a bottom shell jacket heating medium outlet 15, a stirrer 16, a cofferdam 17, a cofferdam outlet 18, a tower jacket heating medium outlet 19, a falling film element 20, a horizontal cross pipe 201 in the falling film element, a vertical pipe 202 in the falling film element, a vacuum suction opening 21, a shell flange 22, a shell bolt 23, a heating medium outlet 24, a seal head 25 and a material inlet 26.
Detailed Description
As shown in the figure, the horizontal inter-tube falling film melt polycondensation reactor provided by the present embodiment includes a vertical tower body 7, a head 25 and a bottom shell 12, wherein the vertical tower body 7 is provided with a vacuum pumping port 21; the reactor is provided with a material inlet 26 at an end enclosure 25, and a material outlet 14 on a bottom shell 12; the upper part of the reactor is provided with a material chamber 5.
The reactor is provided with two or more groups of falling film elements 20 which are arranged in parallel from top to bottom by a plurality of transverse pipes 201, and two ends of the falling film elements are connected with vertical pipes 202, the falling film elements 20 are vertically installed, and the transverse pipes 201 of each group of falling film elements at the same height are positioned in the same transverse pipe layer.
Two adjacent horizontal pipes up and down in the falling film element are related, the horizontal pipes at the same height of two adjacent groups of falling film elements are also related, the bottom plate 51 of the material chamber 5 is a film distribution plate, the film distribution plate is provided with film distribution holes 511 arranged for the horizontal pipes, the film distribution plate is provided with a plurality of film distribution holes 511 for every adjacent two horizontal pipes 2101 below the film distribution plate, and the axial projection of the film distribution holes 511 along the tower body direction is positioned between the central axes of the adjacent two horizontal pipes 291.
The molten material enters between two horizontal pipes 201 at the same horizontal position on two adjacent groups of falling film elements after being distributed from the film distribution plate 51, the material is gradually collected between the two horizontal pipes 201 at the same horizontal position of two adjacent groups and is guided by the cambered surfaces or inclined surfaces of the two pipes, and the material becomes a curtain falling film from a gap between the two pipes to a gap between the two corresponding horizontal pipes below, so that the melt flows in the gap between the two pipes and carries out the melt polycondensation reaction when the falling film moves between the upper horizontal pipe and the lower horizontal pipe.
The ratio of the tube spacing between two adjacent transverse tubes 221 in the transverse tube layer (the distance between the top ends of the adjacent sides of the two adjacent transverse tubes) to the circumscribed circle diameter of the transverse tube is 0.1-10, and the ratio of the layer spacing between two adjacent transverse tube layers (the distance between the upper end and the lower end of the outer wall of the upper transverse tube and the lower transverse tube adjacent to each other) to the outer diameter of the tube is 1-500. In a preferred embodiment, the cross tubes 221 in the falling film elements are gradually smaller from top to bottom.
From top to bottom, the intertube distance of violently managing with the layer is the same or crescent, and the intertube distance of violently managing of top layer and the intertube distance's of bottom ratio are 1:1 to 5; and/or, from top to bottom, the interlamellar spacing between layers is the same or progressively increases, and the interlamellar spacing at the top is 1 with the interlamellar spacing at the bottom: 1 to 20.
The cross-sectional shape of the cross-tubes may be selected from a circular shape, an oval shape, an egg shape, an arc shape with a convex upper portion, a triangular shape, other polygonal shapes, and the like, as long as the two adjacent cross-tubes 221 have an arc surface or an inclined surface above the gap between the narrowest tubes to form the introduction grooves.
Preferably, the transverse tube can be a corrugated tube.
The bottom of the vertical tower body is provided with a groove-shaped cofferdam 17, and a cofferdam outlet 18 on the cofferdam is communicated with the outside of the kettle and can be used for discharging residues on the inner wall of the tower body.
The reactor is provided with a heat preservation and heat transfer system, an upper heat medium chamber (a heat medium inflow box body 3) and a lower heat medium chamber (a heat medium outflow box body 4), a heat medium inlet 1 and a heat medium outlet 24 are arranged in the end socket, a vertical tower body 7 and a bottom shell 12 are respectively provided with a tower body jacket 8 and a bottom shell jacket 13, the tower body jacket 8 is provided with a tower body jacket heat medium inlet 6 and a tower body jacket heat medium outlet 19, and the bottom shell jacket 13 is provided with a bottom shell jacket heat medium inlet 11 and a bottom shell jacket heat medium outlet 15; an upper top plate of the material chamber 5 is a lower heat medium chamber bottom plate (a heat medium box body flows out of the lower bottom plate 42), one end of the feeding pipe 2 is connected with the material inlet 26, the other end of the feeding pipe passes through the upper heat medium chamber and the lower heat medium chamber and is communicated with the material chamber 5, a vertical pipe 202 on one side of the falling film element 20 passes through the material chamber 5 and the lower heat medium chamber and is communicated with the upper heat medium chamber, a vertical pipe 202 on the other side of the falling film element passes through the material chamber 5 and is communicated with the lower heat medium chamber, and after the heat medium enters the upper heat medium chamber, the heat medium flows through the vertical pipe on one side of the falling film element to be shunted, enters the transverse pipe layer and then flows out of the lower heat medium chamber and flows out of a heat medium outlet 24 on the seal head; the heat medium of the heat transfer and insulation system circulates to the outside and circulates after being heated or cooled.
The melt polycondensation method adopting the horizontal tube-to-tube falling film reactor comprises the following steps:
the heating medium flows in through a heating medium inlet on the end socket 3, flows into the vertical pipe on one side of the falling film element from the upper heating medium chamber, then is distributed to the horizontal pipe communicated with the upper heating medium chamber, flows out to the lower heating medium chamber from the vertical pipe on the other side of the falling film element, and finally flows to the outside of the polycondensation reactor from the lower heating medium chamber for circulation.
The falling film reactor between the horizontal pipes is provided with two or more groups of falling film elements which are arranged in parallel from top to bottom by a plurality of horizontal pipes, and the two ends of the falling film elements are connected with vertical pipes, the horizontal pipes at the same horizontal position in the two adjacent groups of falling film elements and the two horizontal pipes which are adjacent from top to bottom in the same group of falling film elements are also related, a molten material falls down by gravity in a gap between the two horizontal pipes at the same horizontal position in the two adjacent groups of falling film elements, the falling film flows to the position between the two horizontal pipes which correspond to the two adjacent groups of falling film elements under the curtain-shaped falling film, finally, the falling film is converged to the bottom of the reactor for further reaction and is mixed and homogenized by a stirrer 16 arranged at the bottom, and the discharging is finished after the reaction.
The above-mentioned embodiments are provided for illustrative purposes only and are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention, so that all equivalent technical solutions should also fall within the scope of the present invention, and the scope of the present invention should be limited by the claims.

Claims (8)

1. A horizontal tube-to-tube falling film melt polycondensation method is characterized in that: the method is provided with two or more groups of falling film elements which are arranged in parallel from top to bottom by a plurality of transverse pipes, the two ends of the falling film elements are connected with vertical pipes, the transverse pipes at the same horizontal position in two adjacent groups of falling film elements are also related with the two transverse pipes which are adjacent from top to bottom in the same group of falling film elements, the molten material flows to the transverse pipes of the two adjacent groups of falling film elements corresponding to the right lower side in a curtain-shaped falling film in the gap between the transverse pipes at the same horizontal position in the two adjacent groups of falling film elements, finally slides and converges to the bottom of the reactor for further reaction, mixing and homogenization, and discharging after the reaction is finished.
2. A falling film melt polycondensation reactor between horizontal pipes comprises a vertical tower body, a seal head and a bottom shell, wherein a vacuum extraction opening is arranged on the vertical tower body; the reactor is provided with a material inlet, and the bottom shell is provided with a material outlet; the upper part of the reactor is provided with a material chamber, which is characterized in that: the reactor is provided with two or more groups of falling film elements which are arranged in parallel from top to bottom by a plurality of transverse pipes, and the two ends of the falling film elements are connected with vertical pipes;
the melting material enters between two horizontal pipes at the same horizontal position on two adjacent groups of falling film elements after being distributed from the film distribution plate, the two adjacent groups of falling film elements are related, the two adjacent horizontal pipes on the same group of falling film elements are also related, the material is converged between the two adjacent groups of two horizontal pipes at the same horizontal position and becomes curtain falling film flowing from the gap between the pipes to the gap between the two corresponding horizontal pipes below, and therefore the melt is subjected to melt polycondensation reaction when flowing between the two gaps between the pipes and the falling film moving between the upper horizontal pipe and the lower horizontal pipe.
3. A horizontal inter-tube falling film melt polycondensation reactor according to claim 2, wherein: the cloth membrane plate is provided with a plurality of cloth membrane holes for every two adjacent transverse pipes below the cloth membrane plate, and the projection of the cloth membrane holes along the vertical direction of the tower body is positioned between the central axes of the two transverse pipes.
4. A horizontal tube-to-tube falling film melt polycondensation reactor according to claim 2 wherein: the ratio of the tube spacing between two horizontal tubes at the same horizontal position of two adjacent groups of falling film elements to the diameter of the circumscribed circle of the horizontal tubes is 0.1-10, and the ratio of the layer spacing between the upper and lower adjacent horizontal tubes to the tube diameter is 1-500.
5. A horizontal inter-tube falling film melt polycondensation reactor according to claim 2, wherein: from top to bottom, the same layer is violently managed the pipe interval the same or is progressively increased, and the pipe interval of the top layer violently pipe is 1 with the pipe interval's of the bottom violently pipe ratio: 1 to 5; and/or, from top to bottom, the interlamellar spacing between layers is the same or progressively increases, and the interlamellar spacing at the top is 1 with the interlamellar spacing at the bottom: 1 to 20.
6. A horizontal tube-to-tube falling film melt polycondensation reactor according to claim 2 wherein: the upper part of the transverse pipe is in a convex arc shape or a triangular shape, and the cross section of the transverse pipe is in a circular shape, an oval shape, an egg shape or a polygonal shape.
7. A horizontal tube-to-tube falling film melt polycondensation reactor according to claim 2 wherein: the tube diameter of the transverse tube in the falling film element is unchanged or gradually reduced from top to bottom.
8. A horizontal tube-to-tube falling film melt polycondensation reactor according to claim 2 wherein: the reactor is provided with a heat preservation and heat transfer system, an upper heat medium chamber, a lower heat medium chamber, a heat medium inlet and a heat medium outlet are arranged in the end socket, and the material chamber is positioned below the lower heat medium chamber; the vertical tower body and the bottom shell are respectively provided with a tower body jacket and a bottom shell jacket; an upper top plate of the material chamber is a bottom plate of a lower heat medium chamber, a vertical pipe on one side of the falling film element penetrates through the material chamber and the lower heat medium chamber to be communicated with the upper heat medium chamber, a vertical pipe on the other side of the falling film element penetrates through the material chamber to be communicated with the lower heat medium chamber, and a heat medium enters the upper heat medium chamber, flows through the vertical pipe on one side of the falling film element, is shunted to enter a transverse pipe layer, then flows through the vertical pipe on the other side, flows to the lower heat medium chamber and flows out from a heat medium outlet on the end enclosure; the heat medium of the heat transfer and insulation system circulates to the outside and is heated or cooled to run circularly.
CN202211129665.3A 2022-09-16 2022-09-16 Horizontal tube-to-tube falling film melt polycondensation method and reactor Pending CN115624949A (en)

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CN202211129665.3A CN115624949A (en) 2022-09-16 2022-09-16 Horizontal tube-to-tube falling film melt polycondensation method and reactor

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CN202211129665.3A CN115624949A (en) 2022-09-16 2022-09-16 Horizontal tube-to-tube falling film melt polycondensation method and reactor

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