CN215611494U - Multistage lactide generation reactor - Google Patents
Multistage lactide generation reactor Download PDFInfo
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- CN215611494U CN215611494U CN202121066504.5U CN202121066504U CN215611494U CN 215611494 U CN215611494 U CN 215611494U CN 202121066504 U CN202121066504 U CN 202121066504U CN 215611494 U CN215611494 U CN 215611494U
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Abstract
The utility model relates to the technical field of lactide preparation devices, in particular to a multistage lactide generation reactor. The multistage lactide generation reactor comprises a shell, an upper end cover, a demister, a liquid distribution disc, a liquid distribution groove, a lower bevel gear pushing scraper, a residual liquid scraping collection groove collecting pipe and a plurality of residual liquid depolymerization grooves, wherein the demister, the liquid distribution disc, the liquid distribution groove, the lower bevel gear pushing scraper, the residual liquid scraping collection groove collecting pipe and the residual liquid depolymerization grooves are sequentially arranged in the shell from top to bottom; the lower bevel gear pushes the lower part of the scraper plate to correspond to the residual liquid scraping and collecting tank, and the bottom of the residual liquid scraping and collecting tank is communicated with a residual liquid scraping and collecting tank collecting pipe; one residual solution depolymerization tank is connected with a residual solution scraping and collecting tank collecting pipe and is sequentially connected with the residual solution depolymerization tanks, and heating rotors are arranged in the residual solution depolymerization tanks. The utility model adopts the lower inclined tooth push type scraper combined with the multistage residual liquid depolymerization tank to carry out grading treatment after the concentration gradient change of the depolymerizable substance, thereby realizing continuous depolymerization, leading the oligomer to be quickly depolymerized and simultaneously improving the yield of the lactide.
Description
Technical Field
The utility model relates to the technical field of lactide preparation devices, in particular to a multistage lactide generation reactor.
Background
Polylactic acid is a degradable material with multiple fields and uses, and the generation process flow of the polylactic acid adopts the reaction of depolymerizing oligomer to generate lactide. The reaction affects the quality and yield of polylactic acid, the traditional method adopts a kettle or single-stage knifing reaction, and the yield and quality of the method cannot be considered at the same time.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a multistage lactide generation reactor, which adopts a lower inclined tooth push type scraper combined with a multistage residual liquid depolymerization tank to carry out grading treatment after the concentration gradient of a depolymerizable substance changes, thereby realizing continuous depolymerization, leading the oligomer to be quickly depolymerized and simultaneously improving the yield of lactide.
The multistage lactide generation reactor comprises a shell, an upper end cover, a demister, a liquid distribution disc, a liquid distribution groove, a lower bevel gear pushing scraper, a residual liquid scraping collection groove collecting pipe and a plurality of residual liquid depolymerization grooves, wherein the demister, the liquid distribution disc, the liquid distribution groove, the lower bevel gear pushing scraper, the residual liquid scraping collection groove and the liquid scraping collection groove are sequentially arranged in the shell from top to bottom;
the top of the shell is provided with an upper end cover, a variable frequency speed regulator is arranged above the upper end cover, and the lower end of a middle bearing of the variable frequency speed regulator is fixedly connected with a lower bevel gear pushing scraper;
a tangential feed port and a lactide gas outlet are arranged on the side surface of the upper part of the shell, the position of the tangential feed port corresponds to the liquid distribution disc, and a liquid distribution groove corresponds to the lower part of the liquid distribution disc;
the middle heating jacket is arranged on the outer wall of the middle part of the shell, the position of the middle heating jacket corresponds to the lower bevel tooth pushing scraper, the lower part of the lower bevel tooth pushing scraper corresponds to the residual liquid scraping collecting tank, and the bottom of the residual liquid scraping collecting tank is communicated with a residual liquid scraping collecting tank collecting pipe;
a plurality of residual solution depolymerization tanks are distributed in the lower part of the shell, one of the residual solution depolymerization tanks is connected with a residual solution scraping and collecting tank collecting pipe and is sequentially connected with the residual solution depolymerization tanks, and heating rotors are arranged in the residual solution depolymerization tanks.
The lower bevel gear pushes the scraper to be in contact with the inner wall of the shell, depolymerized liquid is collected, flows into the residual liquid scraping collecting tank along the inner wall of the shell, enters the first-stage residual liquid depolymerizing tank through the residual liquid scraping collecting tank collecting pipe to be depolymerized, and is depolymerized through other residual liquid depolymerizing tanks in sequence.
The variable frequency speed regulator is arranged above the upper end cover through an upper bearing support and a mechanical seal. The variable-frequency speed regulator is used as a power source, the speed regulation range is 0-300 revolutions, the variable-frequency speed regulator is fixed on a bearing support with a middle bearing system, the upper part of a middle bearing of the bearing support is connected with an output shaft of the variable-frequency speed regulator, the lower part of the bearing support is fixedly connected with a lower helical tooth pushing scraper, and the middle bearing is connected with an upper end cover through a mechanical seal.
And a vacuum pressure gauge is arranged above the upper end cover and used for monitoring the pressure inside the shell.
The opening position of the lactide air outlet is positioned above the demister, and the generated lactide is collected by the lactide air outlet after being defoamed by the demister.
The residual depolymerization tank was equipped with a thermometer for monitoring the temperature inside the residual depolymerization tank.
The heating rotor is connected with a rotary transmission device and a heat medium inlet and outlet rotary joint, the rotary transmission device is used for controlling the heating rotor to rotate, the materials in the residual liquid depolymerization tank are stirred and heated, and the heat medium inlet and outlet rotary joint provides heat for the heating rotor.
Preferably, the number of residual depolymerization tanks is 2 to 5. Further preferably, the number of residual depolymerization tanks is 3. The residual liquid depolymerization tank can be arranged up and down or horizontally, liquid level difference overflow liquid is conveyed, a heating rotor capable of rotating and stirring materials is arranged in the residual liquid depolymerization tank, and the heating rotor can be in a hollow tube type, a hollow slurry type or other heating structure types.
The outer wall of the bottom of the shell is provided with a bottom heating jacket, and the bottom heating jacket is used for heat preservation or assisting depolymerization.
The bottom of the shell is provided with a residue discharge opening for discharging residual liquid out of the shell.
The working process of the multistage lactide generation reactor is as follows:
taking a three-stage residual liquid depolymerization tank as an example, after an oligomer is introduced into the shell through a tangential feed inlet, liquid is distributed through a liquid distribution disc and a liquid distribution tank, depolymerization reaction is carried out in a heating region in the middle of the shell, residual liquid after depolymerization is collected by a scraper blade pushed by a lower bevel gear, flows into a residual liquid scraping collection tank along the inner wall of the shell, then enters a primary residual liquid depolymerization tank through a residual liquid scraping collection tank manifold, continues depolymerization under the stirring and heating of a heating rotor, then sequentially enters a secondary residual liquid depolymerization tank and a three-stage residual liquid depolymerization tank for depolymerization, residual liquid is discharged out of the shell through a residue discharge port, and generated lactide is defoamed by a foam remover and then is collected by a lactide gas outlet.
Compared with the prior art, the utility model has the following beneficial effects:
the multistage lactide generation reactor adopts the lower inclined tooth push type scraper combined with the multistage residual liquid depolymerization tank to carry out grading treatment after the concentration gradient change of the depolymerizable substance, thereby realizing continuous depolymerization, leading the oligomer to be quickly depolymerized and simultaneously improving the yield of the lactide.
Drawings
FIG. 1 is a schematic diagram of the configuration of a multistage lactide production reactor of the present invention;
in the figure: 1. a vacuum pressure gauge; 2. an upper end cover; 3. a demister; 4. a housing; 5. a tangential feed inlet; 6. a liquid distribution plate; 7. a middle heating jacket; 8. the lower oblique teeth push the scraper; 9. heating the rotor; 10. a thermometer; 11. a bottom heating jacket; 12. a variable frequency governor; 13. a bearing support; 14. mechanical sealing; 15. a lactide gas outlet; 16. a liquid distributing groove; 17. a middle bearing; 18. a liquid collecting tank for scraping residual liquid; 19. a residual liquid scraping and collecting tank collecting pipe; 20. a residual liquid depolymerization tank; 21. a rotation transmission device; 22. the heat medium enters and exits the rotary joint; 23. and (4) residue discharge.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
As shown in fig. 1, the multistage lactide production reactor of the present invention comprises a shell 4, an upper end cap 2, a demister 3, a liquid distribution plate 6, a liquid distribution tank 16, a lower bevel gear pushing scraper 8, a raffinate scraping and collecting tank 18, a raffinate scraping and collecting tank manifold 19, and 3 raffinate depolymerization tanks 20, which are sequentially arranged inside the shell 4 from top to bottom;
the top of the shell 4 is provided with an upper end cover 2, a variable frequency speed regulator 12 is arranged above the upper end cover 2, and the lower end of a middle bearing 17 of the variable frequency speed regulator 12 is fixedly connected with a lower bevel gear pushing scraper 8;
the side surface of the upper part of the shell 4 is provided with a tangential feed port 5 and a lactide air outlet 15, the position of the tangential feed port 5 corresponds to the liquid distribution disc 6, and the lower part of the liquid distribution disc 6 corresponds to the liquid distribution groove 16;
a middle heating jacket 7 is arranged on the outer wall of the middle part of the shell 4, the position of the middle heating jacket 7 corresponds to that of the lower bevel gear pushing scraper 8, a residual liquid scraping and collecting tank 18 corresponds to the lower part of the lower bevel gear pushing scraper 8, and the bottom of the residual liquid scraping and collecting tank 18 is communicated with a residual liquid scraping and collecting tank collecting pipe 19;
a plurality of residual solution depolymerization tanks 20 are distributed in the lower part of the shell 4, one residual solution depolymerization tank 20 is connected with a residual solution scraping and collecting tank manifold 19 and is sequentially connected with the residual solution depolymerization tanks 20, and heating rotors 9 are arranged in the residual solution depolymerization tanks 20.
The lower bevel gear pushes the scraper blade 8 to contact with the inner wall of the shell 4, depolymerized liquid is collected, flows into a residual liquid scraping collecting tank 18 along the inner wall of the shell 4, enters a first-level residual liquid depolymerizing tank 20 through a residual liquid scraping collecting tank collecting pipe 19 for depolymerizing, and is depolymerized through other residual liquid depolymerizing tanks 20 in sequence.
The variable frequency governor 12 is mounted above the upper end cover 2 through an upper bearing support 13 and a mechanical seal 14. The variable frequency speed regulator 12 is used as a power source, the speed regulation range is 0-300 revolutions, the variable frequency speed regulator 12 is fixed on a bearing support 13 with a middle bearing 17 system, the upper part of a middle bearing 17 of the bearing support 13 is connected with an output shaft of the variable frequency speed regulator 12, the lower part of the middle bearing is fixedly connected with a lower skewed tooth pushing scraper 8, and the middle bearing 17 is connected with the upper end cover 2 by a mechanical seal 14.
And a vacuum pressure gauge 1 is arranged above the upper end cover 2 and used for monitoring the pressure inside the shell 4.
The opening position of the lactide gas outlet 15 is located above the demister 3, and the generated lactide is defoamed by the demister 3 and then is collected by the lactide gas outlet 15.
The residual depolymerization tank 20 is equipped with a thermometer 10 for monitoring the temperature inside the residual depolymerization tank 20.
The heating rotor 9 is connected with a rotary transmission device 21 and a heat medium inlet and outlet rotary joint 22, the rotary transmission device 21 is used for controlling the heating rotor 9 to rotate, so that the materials in the residual depolymerization tank 20 are stirred and heated, and the heat medium inlet and outlet rotary joint 22 provides heat for the heating rotor 9.
The residual solution depolymerization tank 20 can be arranged up and down or horizontally, liquid level difference overflow is conveyed, a heating rotor 9 capable of rotating and stirring materials is arranged in the residual solution depolymerization tank 20, and the heating rotor 9 can be in a hollow tube type, a hollow slurry type or other heating structure types.
The outer wall of the bottom of the shell 4 is provided with a bottom heating jacket 11, and the heat preservation or the auxiliary depolymerization is carried out through the bottom heating jacket 11.
The bottom of the housing 4 is provided with a residue discharge opening 23 for discharging the residue out of the housing 4.
The working process of the multistage lactide generation reactor is as follows:
taking the third-stage residual liquid depolymerization tank 20 as an example, after the oligomer is introduced into the shell 4 through the tangential feed inlet 5, the oligomer is distributed through the liquid distribution disk 6 and the liquid distribution tank 16, depolymerization reaction is carried out in a heating area in the middle of the shell 4, the depolymerized residual liquid is collected by the scraper 8 pushed by the lower bevel gear, flows into the residual liquid scraping collection tank 18 along the inner wall of the shell 4, then enters the first-stage residual liquid depolymerization tank 20 through the residual liquid scraping collection tank collecting pipe 19, is continuously depolymerized under the stirring and heating of the heating rotor 9, then sequentially enters the second-stage residual liquid depolymerization tank 20 and the third-stage residual liquid depolymerization tank 20 for depolymerization, the residual liquid is discharged out of the shell 4 through the residue discharge port 32, and the generated lactide is defoamed by the foam remover 3 and then is collected by the lactide gas outlet 15.
Claims (10)
1. A multistage lactide production reactor, characterized by: comprises a shell (4), an upper end cover (2), a demister (3), a liquid distribution disc (6), a liquid distribution groove (16), a lower bevel gear pushing scraper (8), a residual liquid scraping and collecting groove (18), a residual liquid scraping and collecting groove collecting pipe (19) and a plurality of residual liquid depolymerization grooves (20) which are sequentially arranged in the shell (4) from top to bottom;
an upper end cover (2) is installed at the top of the shell (4), a variable frequency governor (12) is installed above the upper end cover (2), and the lower end of a middle bearing (17) of the variable frequency governor (12) is fixedly connected with a lower bevel gear pushing scraper (8);
the side surface of the upper part of the shell (4) is provided with a tangential feed port (5) and a lactide air outlet (15), the position of the tangential feed port (5) corresponds to the liquid distribution disc (6), and the lower part of the liquid distribution disc (6) corresponds to the liquid distribution groove (16);
a middle heating jacket (7) is arranged on the outer wall of the middle part of the shell (4), the position of the middle heating jacket (7) corresponds to the lower bevel gear pushing scraper (8), a residual liquid scraping and collecting tank (18) corresponds to the lower part of the lower bevel gear pushing scraper (8), and the bottom of the residual liquid scraping and collecting tank (18) is communicated with a residual liquid scraping and collecting tank manifold (19);
a plurality of residual liquid depolymerization tanks (20) are distributed in the lower part of the shell (4), one of the residual liquid depolymerization tanks (20) is connected with a residual liquid scraping and collecting tank manifold (19) and is sequentially connected with the residual liquid depolymerization tanks (20), and heating rotors (9) are arranged in the residual liquid depolymerization tanks (20).
2. The multistage lactide production reactor according to claim 1, characterized in that: the lower bevel gear pushes the scraper (8) to contact with the inner wall of the shell (4).
3. The multistage lactide production reactor according to claim 1, characterized in that: the variable frequency speed regulator (12) is arranged above the upper end cover (2) through an upper bearing support (13) and a mechanical seal (14).
4. The multistage lactide production reactor according to claim 1, characterized in that: a vacuum pressure gauge (1) is arranged above the upper end cover (2).
5. The multistage lactide production reactor according to claim 1, characterized in that: the opening position of the lactide air outlet (15) is positioned above the demister (3).
6. The multistage lactide production reactor according to claim 1, characterized in that: the residual depolymerization tank (20) is equipped with a thermometer (10).
7. The multistage lactide production reactor according to claim 1, characterized in that: the heating rotor (9) is connected with a rotary transmission device (21) and a heat medium inlet and outlet rotary joint (22).
8. The multistage lactide production reactor according to claim 1, characterized in that: the number of residual depolymerization tanks (20) is 2-5.
9. The multistage lactide production reactor according to claim 8, characterized in that: the number of residual depolymerization tanks (20) was 3.
10. The multistage lactide production reactor according to claim 1, characterized in that: the outer wall of the bottom of the shell (4) is provided with a bottom heating jacket (11), and the bottom of the shell (4) is provided with a residue discharge opening (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121066504.5U CN215611494U (en) | 2021-05-18 | 2021-05-18 | Multistage lactide generation reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121066504.5U CN215611494U (en) | 2021-05-18 | 2021-05-18 | Multistage lactide generation reactor |
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| Publication Number | Publication Date |
|---|---|
| CN215611494U true CN215611494U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121066504.5U Active CN215611494U (en) | 2021-05-18 | 2021-05-18 | Multistage lactide generation reactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215611494U (en) |
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2021
- 2021-05-18 CN CN202121066504.5U patent/CN215611494U/en active Active
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