Depolymerization reaction device for co-production of tetrahydrofuran copolyether glycol and polytetrahydrofuran

Abstract

The utility model discloses a depolymerization reaction device for co-production of tetrahydrofuran copolyether glycol and polytetrahydrofuran, which relates to the technical field of depolymerization reaction kettles and comprises a reaction kettle body and further comprises a stretching and stirring mechanism arranged in the reaction kettle body and used for stretching and stirring the tetrahydrofuran copolyether glycol and the polytetrahydrofuran. The depolymerization reaction device for co-production of tetrahydrofuran copolyether glycol and polytetrahydrofuran is used for stretching and stirring depolymerization of co-production of tetrahydrofuran copolyether glycol and polytetrahydrofuran in the reaction kettle body, so that the reaction is more sufficient, and the reaction rate is increased. According to the present invention, the contact area between reactants is increased, the mass transfer efficiency is improved, the reaction is completely performed, the reaction rate is accelerated, the stretching stirring can well contact the polymer molecular chain with the catalyst or other reactants during the depolymerization reaction, the depolymerization reaction is promoted, and the conversion rate and the selectivity of the reaction are improved.

Description

Technical Field

[0001] This utility model relates to the field of depolymerization reactor technology, specifically a depolymerization reaction device for co-producing tetrahydrofuran copolyether diol and polytetrahydrofuran. Background Technology

[0002] Tetrahydrofuran co-ether glycol (PTXG) is a co-ether glycol polymerized from tetrahydrofuran (THF) and at least one epoxy compound in the presence of an acid catalyst and a compound containing active hydrogen atoms. It is an important chemical raw material, mainly used in the production of polyurethane elastomers, spandex, and ester ether co-polymer elastomers. PTXG possesses excellent hydrolytic stability, air permeability, abrasion resistance, and low-temperature mechanical properties, and has broad application prospects in textiles, pipes, chemicals, synthetic leather, medical devices, automobiles, shipbuilding, construction, and military industries.

[0003] A depolymerization reactor, authorized by publication number CN221868452U, includes a pressure vessel and a stirrer disposed within the pressure vessel. The pressure vessel comprises a first cylinder and a second cylinder connected vertically and sealed in the height direction, with the stirrer located within the first cylinder. The first cylinder has a feed inlet and a gas outlet, while the second cylinder has a steam inlet and a discharge outlet. The inner cavities of the second and first cylinders form a reaction chamber for steam to rise and mix with the material, thus achieving convective heat exchange. This depolymerization reactor, with a steam inlet located on the pressure vessel, allows steam to mix with the material for convective heat exchange, avoiding the blockage and corrosion problems of heat transfer tubes associated with indirect heat exchange. Simultaneously, it reduces the temperature of the first cylinder of the pressure vessel, eliminating the need for a mechanical seal cooling system, reducing costs, and simplifying the structure.

[0004] As shown in the above equipment, the existing depolymerization reaction device for co-producing tetrahydrofuran copolyether diol and polytetrahydrofuran can reduce the temperature of the first cylinder of the pressure vessel, thus eliminating the need for a mechanical seal cooling system, reducing costs, and simplifying the structure. However, during material stirring, the fixed stirring range and material contact area of ​​the existing stirring rod are limited, which may prevent the materials from being fully mixed in the reactor. This can lead to excessively high or low local concentrations of materials, affecting the depolymerization reaction, reducing reaction efficiency, and lowering product quality. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a depolymerization reaction apparatus for the co-production of tetrahydrofuran copolyether diol and polytetrahydrofuran, thus solving the problems of existing technologies.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a depolymerization reaction apparatus for co-producing tetrahydrofuran copolyether diol and polytetrahydrofuran, comprising a reaction vessel body, and further comprising:

[0007] The stretching and stirring mechanism is located inside the reactor body and is used to stretch and stir the depolymerization of the co-produced tetrahydrofuran copolyether diol and polytetrahydrofuran inside the reactor body, so as to make the reaction more complete and accelerate the reaction rate.

[0008] A filter assembly is located above the reactor body and is used to filter the gas discharged from the reactor body through the gas phase pipe.

[0009] The stretching and stirring mechanism includes an output rod, which is located inside the reactor body. One end of the output rod is connected to a motor for power supply, and another end of the output rod is connected to a rotating shaft. One end of the rotating shaft is connected to a transmission rod, and the outer wall of the transmission rod is provided with a stretching component for stretching and adjusting the position of the stirring structure.

[0010] Preferably, the stretching assembly includes a connecting ring connected to the outer wall of the transmission rod. A hydraulic rod B is connected to the outer wall of the connecting ring. One end of the hydraulic rod B is connected to a hinge ring. A crank rocker arm is hinged to the outer wall of the hinge ring. A hinge rod is hinged to one end of the crank rocker arm. A hinge plate is hinged to one end of the hinge rod. A stirring plate is connected to the other end of the hinge rod. An installation ring is fixedly connected to one end of the hinge plate. The installation ring is fixedly connected to the outer wall of the transmission rod.

[0011] Preferably, the filter assembly includes a mounting housing, which is disposed above the reactor body. One end of the mounting housing has an air inlet, and the other end has an air outlet. A filter screen is fixedly connected inside the mounting housing, an adsorption layer is provided on one side of the filter screen, and a filter cotton plug is provided inside the mounting housing.

[0012] Preferably, a material conveying pipe is fixedly installed on the outer wall of the reactor body, a gas phase pipe is fixedly installed at the top of the reactor body for exhaust gas discharge, the reactor body is connected to the filter assembly through the gas phase pipe, a discharge pipe is fixedly connected to the bottom of the reactor body, and an inclined groove plate is fixedly installed on the inner wall of the reactor body.

[0013] Preferably, a pressure gauge is fixedly installed at the top of the reactor body for detecting the internal pressure of the reactor body, and an observation sight glass is fixedly installed at the top of the reactor body for observing the interior of the reactor body.

[0014] Preferably, a support frame is fixedly connected to the outer wall of the reactor body, a base plate is fixedly installed at the bottom of the support frame, and a distillation column body is fixedly connected to the outer wall of the base plate for separating and purifying the substances after depolymerization reaction inside the reactor body. The reactor body is connected to the distillation column body through a discharge pipe.

[0015] This invention provides a depolymerization reaction apparatus for the co-production of tetrahydrofuran copolyether diol and polytetrahydrofuran. Compared with the prior art, it has the following advantages:

[0016] 1. The depolymerization reaction apparatus for co-producing tetrahydrofuran copolyether diol and polytetrahydrofuran is equipped with a stretching and stirring mechanism. The stretching and stirring mechanism can fully mix the reactants, increase the contact area between the reactants, improve the mass transfer efficiency, make the reaction more complete, and accelerate the reaction rate. At the same time, in the depolymerization reaction, the stretching and stirring can make the polymer molecular chains better contact with the catalyst or other reactants, promote the depolymerization reaction, and improve the conversion rate and selectivity of the reaction.

[0017] 2. The depolymerization reaction unit for co-producing tetrahydrofuran co-polyether diol and polytetrahydrofuran is equipped with a filtration system. If the gaseous effluent containing impurities is directly discharged into the environment, it may cause pollution to the air, soil, and water. By removing impurities through the filtration system, the emitted gas can be cleaner, reducing environmental pollution and meeting environmental protection requirements. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the stretching and stirring mechanism of this utility model;

[0021] Figure 4 This is a schematic diagram of the tensioning component of this utility model;

[0022] Figure 5 This is a schematic diagram of the filter assembly of this utility model.

[0023] In the diagram: 1. Reactor body; 2. Support frame; 3. Feed inlet; 4. Pressure gauge; 5. Gas discharge pipe; 6. Gas filter assembly; 61. Mounting shell; 62. Gas inlet; 63. Gas outlet; 64. Filter screen; 65. Adsorption layer; 66. Filter plug; 7. Sight glass; 8. Tensioning and stirring mechanism; 81. Output rod; 82. Rotating shaft; 83. Transmission rod; 84. Tensioning assembly; 841. Connecting ring; 842. Hydraulic rod B; 843. Hinge ring; 844. Crank rocker arm; 845. Mounting ring; 846. Hinge plate; 847. Hinge rod; 848. Stirring plate; 85. Motor; 9. Inclined trough plate; 10. Discharge pipe; 11. Distillation column body; 12. Base plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] See Figures 1-5 This utility model provides the following two technical solutions:

[0026] First embodiment: A depolymerization reaction apparatus for co-producing tetrahydrofuran copolyether diol and polytetrahydrofuran, comprising a reaction vessel body 1, and further comprising:

[0027] The stretching and stirring mechanism 8 is located inside the reactor body 1 and is used to stretch and stir the depolymerization of the co-produced tetrahydrofuran copolyether diol and polytetrahydrofuran inside the reactor body 1, so that the reaction is more complete and the reaction rate is accelerated.

[0028] The filter assembly 6 is located above the reactor body 1 and is used to filter the gas discharged from the reactor body 1 through the gas phase pipe 5.

[0029] A conveying pipe 3 is fixedly installed on the outer wall of the reactor body 1. A gas phase pipe 5 is fixedly installed on the top of the reactor body 1 for exhaust gas discharge. The reactor body 1 is connected to the filter assembly 6 through the gas phase pipe 5. A discharge pipe 10 is fixedly connected to the bottom of the reactor body 1. An inclined groove plate 9 is fixedly installed on the inner wall of the reactor body 1.

[0030] A pressure gauge 4 is fixedly installed at the top of the reactor body 1 for detecting the internal pressure of the reactor body 1. An observation sight glass 7 is fixedly installed at the top of the reactor body 1 for observing the interior of the reactor body 1.

[0031] A support frame 2 is fixedly connected to the outer wall of the reactor body 1. A base plate 12 is fixedly installed at the bottom of the support frame 2. A distillation column body 11 is fixedly connected to the outer wall of the base plate 12. The base plate 11 is used to separate and purify the substances after the depolymerization reaction inside the reactor body 1. The reactor body 1 is connected to the distillation column body 11 through the discharge pipe 10.

[0032] The stretching and stirring mechanism 8 includes an output rod 81, which is located inside the reactor body 1. One end of the output rod 81 is connected to a motor 85 for power supply, and one end of the output rod 81 is connected to a rotating shaft 82. One end of the rotating shaft 82 is connected to a transmission rod 83. The outer wall of the transmission rod 83 is provided with a stretching component 84 for stretching and adjusting the position of the stirring structure.

[0033] The tensioning assembly 84 includes a connecting ring 841 connected to the outer wall of the transmission rod 83. A hydraulic rod B842 is connected to the outer wall of the connecting ring 841. One end of the hydraulic rod B842 is connected to a hinge ring 843. A crank rocker arm 844 is hinged to the outer wall of the hinge ring 843. A hinge rod 847 is hinged to one end of the crank rocker arm 844. A hinge plate 846 is hinged to one end of the hinge rod 847. A stirring plate 848 is connected to the other end of the hinge rod 847. An installation ring 845 is fixedly connected to one end of the hinge plate 846. The installation ring 845 is fixedly connected to the outer wall of the transmission rod 83.

[0034] The depolymerization reaction apparatus for co-producing tetrahydrofuran copolyether diol and polytetrahydrofuran is equipped with a stretching and stirring mechanism 8, which can fully mix the reactants, increase the contact area between the reactants, improve mass transfer efficiency, make the reaction more complete, accelerate the reaction rate, shorten the reaction time, and improve production efficiency. At the same time, in the depolymerization reaction, the stretching and stirring can make the polymer molecular chains better contact with the catalyst or other reactants, promote the depolymerization reaction, and improve the conversion rate and selectivity of the reaction.

[0035] The second embodiment differs from the first embodiment in that the filter assembly 6 includes a mounting shell 61, which is positioned above the reactor body 1. One end of the mounting shell 61 has an air inlet 62, and the other end has an air outlet 63. A filter screen 64 is fixedly connected inside the mounting shell 61. An adsorption layer 65 is provided on one side of the filter screen 64, and a filter cotton plug 66 is provided inside the mounting shell 61.

[0036] The depolymerization reaction unit for co-producing tetrahydrofuran copolyether diol and polytetrahydrofuran is equipped with a filter assembly 6. If the gaseous effluent containing impurities is directly discharged into the environment, it may cause pollution to the air, soil, and water. By removing impurities through the filter assembly 6, the emitted gas is cleaner, reducing environmental pollution and meeting environmental protection requirements.

[0037] Furthermore, all content not described in detail in this specification is existing technology known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used.

[0038] When the equipment is in use, the required materials are fed into the reactor body 1 through the feed pipe 3. When stirring is required, the hydraulic rod B842 extends and retracts, causing the hinge ring 843 to slide on the outer wall of the transmission rod 83, which in turn drives the crank rocker 844 to rotate. The rotation of the crank rocker 844 drives the hinge rod 847 to move, which in turn drives the stirring plate 848 to move. As the crank rocker 844 moves continuously, it drives the hinge rod 847 and the stirring plate 848 to rotate and stretch continuously. When the stretching reaches a certain extent, the motor 85 is started. The operation of the motor 85 drives the output rod 81 to operate, which in turn drives the rotating shaft 82 and the transmission rod 83 to rotate. The rotation of the transmission rod 83 drives the entire stretching assembly 84 to rotate, thereby driving the stretching assembly 84 to rotate. The stirring plate 848 in the extension assembly 84 rotates inside the reactor body 1 to stir the materials inside. When the stirring inside the reactor body 1 causes the materials inside to react and generate waste gas, the waste gas enters the interior of the mounting shell 61 through the gas phase pipe 5 and the inlet 62. Then, it undergoes a first filtration through the filter screen 64 set on the inner wall of the mounting shell 61, followed by a second filtration through the three adsorption layers 65 with activated carbon, a third filtration through the filter cotton plug 66, and finally a fourth filtration through the filter screen 64. The harmful impurities carried in the waste gas are filtered out. The filtered air can finally be discharged through the outlet 63. The reacted substances can enter the distillation column body 11 through the discharge pipe 10 for separation and purification, and finally be output through the feed pipe at one end of the distillation column body 11.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A depolymerization reaction apparatus for co-producing tetrahydrofuran copolyether diol and polytetrahydrofuran, comprising a reactor body (1), characterized in that, Also includes: The stretching and stirring mechanism (8) is located inside the reactor body (1) and is used to stretch and stir the depolymerization of the co-produced tetrahydrofuran copolyether diol and polytetrahydrofuran inside the reactor body (1) so that the reaction is more complete and the reaction rate is accelerated. A filter assembly (6) is disposed above the reactor body (1) and is used to filter the gas discharged from the reactor body (1) through the gas phase pipe (5). The stretching and stirring mechanism (8) includes an output rod (81), which is located inside the reactor body (1). One end of the output rod (81) is connected to a motor (85) for power supply. One end of the output rod (81) is connected to a rotating shaft (82), and one end of the rotating shaft (82) is connected to a transmission rod (83). The outer wall of the transmission rod (83) is provided with a stretching component (84) for stretching and adjusting the position of the stirring structure.

2. The depolymerization reaction apparatus for co-producing tetrahydrofuran co-polyether diol and polytetrahydrofuran according to claim 1, characterized in that: The tensioning assembly (84) includes a connecting ring (841) connected to the outer wall of the transmission rod (83). A hydraulic rod B (842) is connected to the outer wall of the connecting ring (841). One end of the hydraulic rod B (842) is connected to a hinge ring (843). A crank rocker arm (844) is hinged to the outer wall of the hinge ring (843). One end of the crank rocker arm (844) is hinged to a hinge rod (847). One end of the hinge rod (847) is hinged to a hinge plate (846). The other end of the hinge rod (847) is connected to a stirring plate (848). One end of the hinge plate (846) is fixedly connected to an mounting ring (845), which is fixedly connected to the outer wall of the transmission rod (83).

3. The depolymerization reaction apparatus for co-producing tetrahydrofuran co-polyether diol and polytetrahydrofuran according to claim 1, characterized in that: The filter assembly (6) includes a mounting shell (61) which is located above the reactor body (1). One end of the mounting shell (61) has an air inlet (62) and the other end has an air outlet (63). A filter screen (64) is fixedly connected inside the mounting shell (61). An adsorption layer (65) is provided on one side of the filter screen (64). A filter cotton plug (66) is provided inside the mounting shell (61).

4. The depolymerization reaction apparatus for co-producing tetrahydrofuran co-polyether diol and polytetrahydrofuran according to claim 1, characterized in that: A conveying pipe (3) is fixedly installed on the outer wall of the reactor body (1), a gas phase pipe (5) is fixedly installed on the top of the reactor body (1) for exhaust gas discharge, the reactor body (1) is connected to the filter assembly (6) through the gas phase pipe (5), a discharge pipe (10) is fixedly connected to the bottom of the reactor body (1), and an inclined groove plate (9) is fixedly installed on the inner wall of the reactor body (1).

5. The depolymerization reaction apparatus for co-producing tetrahydrofuran co-polyether diol and polytetrahydrofuran according to claim 1, characterized in that: A pressure gauge (4) is fixedly installed at the top of the reactor body (1) for detecting the internal pressure of the reactor body (1). An observation mirror mount (7) is fixedly installed at the top of the reactor body (1) for observing the interior of the reactor body (1).

6. The depolymerization reaction apparatus for co-producing tetrahydrofuran co-polyether diol and polytetrahydrofuran according to claim 1, characterized in that: The outer wall of the reactor body (1) is fixedly connected to a support frame (2), and a base plate (12) is fixedly installed at the bottom of the support frame (2). The outer wall of the base plate (12) is fixedly connected to a distillation column body (11), which is used to separate and purify the objects after the depolymerization reaction inside the reactor body (1). The reactor body (1) is connected to the distillation column body (11) through a discharge pipe (10).

Images