A rectification device for the preparation of isooctyl thioglycolate

Abstract

A rectification device for the preparation of isooctyl thioglycolate, belonging to the technical field of rectification devices, includes a rectification column. Inside the rectification column, an upper packing plate and a lower packing plate are fixedly connected. Between the upper packing plate and the lower packing plate, a plurality of guide rods are fixedly connected together. Two pre-tightening plate mechanisms are slidably connected together on the plurality of guide rods. A multi-directional piston mechanism is arranged between the two pre-tightening plate mechanisms. At positions corresponding to the plurality of guide rods of the multi-directional piston mechanism, there are a plurality of movable ends. Each movable end of the multi-directional piston mechanism is rotatably connected to two connecting rods, and one ends of the two connecting rods are respectively rotatably connected to the two pre-tightening plate mechanisms. In the present invention, by setting the pre-tightening plate mechanism, the multi-directional piston mechanism and the connecting rods, the packing is pressed tightly. When the packing deforms and causes the packing to collapse, larger cavities are eliminated. And by setting the guide rods, connecting rings, first perforated plates and stirring rods, the whole packing is driven to twist, so that the adhered packing is displaced and separated.

Description

Technical Field

[0001] The present invention relates to the technical field of distillation equipment, and specifically to a distillation equipment for the preparation of isooctyl thioglycolate. Background Art

[0002] Isooctyl thioglycolate is an important sulfur-containing ester compound, with both reactive and functional properties, and is widely used in fields such as polymer modification and pharmaceutical synthesis. The distillation of isooctyl thioglycolate is a common purification method for separating and purifying this ester compound, and the distillation process is carried out in a distillation column.

[0003] For example, in the Chinese patent with the publication number CN214105870U: An efficient distillation column, which includes a frame body, a distillation column body, and a lifting device. The distillation column body is located on the frame body, and the lifting device is located inside the distillation column body. The lifting device includes two cleaning rings, two bidirectional screws, and a driving mechanism. The bidirectional screws penetrate through the cleaning rings. The cleaning rings are closely attached to the inner wall of the distillation column body, and the cleaning rings are parallel. The bidirectional screws are arranged along the height direction of the distillation column body. One end of the bidirectional screw is rotationally connected to the distillation column body, and the other end penetrates through the distillation column body and is connected to the driving mechanism. Through the lifting device in the above patent, the cleaning rings reciprocate along the inner wall of the distillation column body, continuously cleaning the inner wall of the distillation column body, reducing labor input, and improving reaction efficiency.

[0004] However, the current distillation equipment still has some deficiencies when distilling isooctyl thioglycolate. For example, there is packing installed between two packing nets in the distillation column. The liquid flows from top to bottom, and the steam flows from bottom to top, and heat and mass transfer occur in the packing layer. During long-term use, the deformation of the packing will cause the packing to collapse, thereby changing the stacking state, resulting in larger cavities in some areas of the packing layer, leading to gas-phase short-circuit and loss of mass transfer area.

[0005] In view of the above problems, a distillation equipment for the preparation of isooctyl thioglycolate is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a distillation equipment for the preparation of isooctyl thioglycolate. By using this device for operation, the problem that the packing deforms and collapses after long-term use, thereby changing the stacking state, and large cavities are generated in some areas of the packing layer, leading to gas-phase short-circuit in the above background is solved.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a distillation device for preparing isooctyl thioglycolate, comprising a distillation tower, an upper filling plate and a lower filling plate are fixedly connected inside the distillation tower, a plurality of guide rods are fixedly connected between the upper filling plate and the lower filling plate, each of the guide rods is fixedly connected to a support block, two pre-tightening plate mechanisms are slidably connected to the plurality of guide rods, the two pre-tightening plate mechanisms are mirror-imaged at the two ends of the plurality of support blocks, the two pre-tightening plate mechanisms are elastically connected to the plurality of support blocks by springs, a multi-directional piston mechanism is arranged between the two pre-tightening plate mechanisms, a plurality of connecting rod groups are rotatably connected to the multi-directional piston mechanism, each connecting rod group comprises two connecting rods, one end of two connecting rods in the same connecting rod group are rotatably connected to the two pre-tightening plate mechanisms respectively, and the two pre-tightening plate mechanisms are connected by a plurality of telescopic tubes.

[0008] Furthermore, an upper packing layer is formed between one of the pre-tightening plate mechanisms and the upper packing plate, and a lower packing layer is formed between the other pre-tightening plate mechanism and the lower packing plate, and both the upper packing layer and the lower packing layer are filled with packing.

[0009] Furthermore, each of the pre-tensioning plate mechanisms includes a connecting ring, two of the connecting rings are slidably connected to a plurality of guide rods, one adjacent side of the two connecting rings is fixedly connected to a second porous plate, the other side of the two connecting rings is rotatably connected to a first porous plate, and both ends of the plurality of telescopic tubes are connected to the openings of the two second porous plates.

[0010] Furthermore, the multi-directional piston mechanism includes a connecting shell, both ends of which are fixedly connected to limit abutment plates, the two limit abutment plates respectively abut against two first porous plates, the side walls of the connecting shell are fixedly connected with plungers at positions corresponding to multiple guide rods, two connecting rods at the same guide rod are rotatably connected to the movable end of the plunger, a multi-head pipe is fixedly connected through the side wall of the connecting shell, the rodless cavities of the multiple plungers are connected to the multi-head pipe, and a pressure sensor is fixed on the side wall of the rod cavity of each plunger.

[0011] Furthermore, a plurality of slide grooves are provided on the end face of each of the connecting rings, a slider is fixedly connected to the end face of each of the first porous plates at positions corresponding to the plurality of slide grooves, a ball is embedded on the bottom surface of each slider, and each ball rolls inside the corresponding slide groove.

[0012] Furthermore, a mounting groove is provided on the end face of each connecting ring at positions corresponding to the multiple guide rods, a first spur gear is rotatably connected to the bottom of each mounting groove, a first tooth groove is circumferentially provided on the side wall of each first porous plate, the first spur gear is meshed with the first tooth groove for transmission, and a stirring rod is fixedly connected to the end face of each first porous plate.

[0013] Further, second tooth grooves are formed in the side walls of each of the guide rods. One end of the rotating shaft of each of the first spur gears is fixedly connected with a first bevel gear. Brackets are fixedly connected to both sides of the top end of each mounting groove. A second spur gear is rotatably connected between the side walls of the two brackets in the same mounting groove. Each second spur gear is in meshing transmission with the second tooth groove. A second bevel gear is fixedly connected to the rotating shaft of each second spur gear. Each second bevel gear is in meshing transmission with the first bevel gear in the corresponding mounting groove.

[0014] Further, a steam outlet is provided at the top end of the rectifying column. A discharge pipe is fixedly connected through the bottom end of the rectifying column. A steam inlet is provided at the lower end of the side wall of the rectifying column. A liquid inlet pipe is fixedly connected through the upper end of the side wall of the rectifying column. A demister and a perforated pipe are fixedly connected inside the rectifying column. The demister is arranged above the perforated pipe. The perforated pipe is arranged above the upper packing plate. The liquid inlet pipe is communicated with the perforated pipe.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. By arranging a pre-tightening plate mechanism, a multi-directional piston mechanism and a connecting rod to compress the packing, during the long-term use of the equipment, the packing is deformed, resulting in the packing collapsing and changing the stacking state. When relatively large cavities are generated in some areas of the packing layer, the pre-tightening force applied by the multi-directional piston mechanism can continue to drive the pre-tightening plate mechanism to further compress the packing through the connecting rod, eliminating the relatively large cavities.

[0017] 2. By arranging the mutual cooperation of the guide rod, the connecting ring, the first perforated plate and the stirring rod, the first perforated plate drives the stirring rod to rotate. Since the packing is in a compressed state, the stirring rod can drive the whole packing to twist, and the adhered packing is displaced and separated. At the same time, when cavities are generated due to the collapse of the packing, the packing can be rearranged, and the cavity areas are refilled. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a schematic cross-sectional structure diagram inside the rectifying column of the present invention;

[0020] Figure 3 is a schematic connection diagram of the pre-tightening plate mechanism and the multi-directional piston mechanism parts of the present invention;

[0021] Figure 4 is a schematic structure diagram of the multi-directional piston mechanism part of the present invention;

[0022] Figure 5 in the present invention Figure 4Enlarged schematic diagram of part A structure;

[0023] Figure 6 Schematic diagram of the structure of the plunger and the multi - head pipe joint part in the present invention;

[0024] Figure 7 Schematic diagram of the connection between the connecting ring and the guide rod part in the present invention;

[0025] Figure 8 In the present invention Figure 7 Enlarged schematic diagram of part B structure;

[0026] Figure 9 Schematic diagram of the structure of the first perforated plate and the second perforated plate parts in the present invention;

[0027] Figure 10 Schematic diagram of the structure of the slider and the ball part in the present invention.

[0028] In the figure: 1, rectifying column; 11, steam outlet; 12, discharge pipe; 13, steam inlet; 14, liquid inlet pipe; 15, demister; 16, perforated pipe row; 2, upper packing plate; 3, lower packing plate; 4, guide rod; 41, second tooth groove; 5, pre - tightening plate mechanism; 51, connecting ring; 511, chute; 512, installation groove; 513, first spur gear; 514, first bevel gear; 515, bracket; 516, second spur gear; 517, second bevel gear; 52, first perforated plate; 521, first tooth groove; 522, slider; 523, ball; 524, stirring rod; 53, second perforated plate; 6, support block; 7, spring; 8, multi - way piston mechanism; 81, connecting shell; 82, limiting abutment plate; 83, plunger; 84, multi - head pipe joint; 85, pressure sensor; 9, connecting rod; 10, telescopic tube. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0030] Such as Figure 1 - Figure 6As shown, a rectification device for the preparation of isooctyl thioglycolate includes a rectification column 1. Inside the rectification column 1, an upper packing plate 2 and a lower packing plate 3 are fixedly connected. A plurality of guide rods 4 are fixedly connected between the upper packing plate 2 and the lower packing plate 3. The plurality of guide rods 4 connect the upper packing plate 2 and the lower packing plate 3 into a whole, strengthening the stability. A support block 6 is fixedly connected to each guide rod 4. Two pre-tightening plate mechanisms 5 are slidably connected to the plurality of guide rods 4 together, for pressing the packing. The two pre-tightening plate mechanisms 5 are arranged in a mirror image at both ends of the plurality of support blocks 6. The two pre-tightening plate mechanisms 5 and the plurality of support blocks 6 are elastically connected by springs 7. The springs 7 keep a certain distance between the two pre-tightening plate mechanisms 5 initially. A multi-directional piston mechanism 8 is arranged between the two pre-tightening plate mechanisms 5. The multi-directional piston mechanism 8 is used to apply a pre-tightening force. A plurality of link groups are rotatably connected to the multi-directional piston mechanism 8. Each link group includes two links 9. One end of the two links 9 in the same link group is respectively rotatably connected to the two pre-tightening plate mechanisms 5. The links 9 are used to drive the two pre-tightening plate mechanisms 5 to move.

[0031] The multi-directional piston mechanism 8 is externally connected to a pressure source. Initially, the two pre-tightening plate mechanisms 5 are elastically connected to the support blocks 6 by springs 7 and maintain a certain distance. When in use, by increasing the pressure inside the multi-directional piston mechanism 8 to push the plurality of link groups rotatably connected to it, the two links 9 in each link group are arranged at a certain angle (such as Figure 4 shown). Under the push of the multi-directional piston mechanism 8, the two links 9 in each link group rotate towards the direction away from each other to increase the angle formed by them, thereby driving the two pre-tightening plate mechanisms 5 to slide along the plurality of guide rods 4 in the direction away from each other, for pressing the packing. During the long-term use of the device, if the packing deforms, resulting in the collapse of the packing and changing the stacking state, and a large cavity is generated in some areas of the packing layer, the pre-tightening force applied by the multi-directional piston mechanism 8 can continue to drive the pre-tightening plate mechanism 5 to further press the packing through the link 9, eliminating the large cavity.

[0032] An upper packing layer is formed between one pre-tightening plate mechanism 5 and the upper packing plate 2, and a lower packing layer is formed between the other pre-tightening plate mechanism 5 and the lower packing plate 3. Both the upper packing layer and the lower packing layer are filled with packing. The packing can be stainless steel θ rings. The two pre-tightening plate mechanisms 5 are connected by a plurality of telescopic tubes 10. In the upper packing layer and the lower packing layer, mass transfer and heat transfer occur between the steam and the liquid to be rectified. The telescopic tubes 10 connect the two packing layers and can adapt to the change in the distance between the two pre-tightening plate mechanisms 5 through their own telescoping.

[0033] At the top of the rectifying column 1, there is a steam outlet 11. The steam outlet 11 is connected to an external condenser through a pipeline. At the bottom of the rectifying column 1, there is a discharge pipe 12 fixedly connected through it. At the lower end of the side wall of the rectifying column 1, there is a steam inlet 13. Both the discharge pipe 12 and the steam inlet 13 are connected to an external reboiler. At the upper end of the side wall of the rectifying column 1, there is a liquid inlet pipe 14 fixedly connected through it, which is used to input the liquid to be rectified. Inside the rectifying column 1, there are a demister 15 and a perforated pipe 16 fixedly connected. The demister 15 is arranged above the perforated pipe 16 and is used to reduce the entrained liquid droplets in the discharged steam. The perforated pipe 16 is arranged above the upper packing plate 2. The liquid inlet pipe 14 is communicated with the perforated pipe 16, so that the input liquid is evenly distributed and discharged downward.

[0034] Each pre-tightening plate mechanism 5 includes a connecting ring 51. Both connecting rings 51 are slidably connected through a plurality of guide rods 4. On one adjacent side of the two connecting rings 51, there is a second perforated plate 53 fixedly connected. On the other side of the two connecting rings 51, there is a first perforated plate 52 rotatably connected. Both ends of a plurality of telescopic tubes 10 are connected to the openings of the two second perforated plates 53, so as to communicate the chambers of the two connecting rings 51, so that the liquid is evenly distributed again after falling from the upper packing layer and then enters the lower packing layer. The first perforated plate 52 and the second perforated plate 53 form a chamber inside the connecting ring 51. The liquid enters the chamber and forms a liquid level with a certain height.

[0035] The multi-directional piston mechanism 8 includes a connecting shell 81. At both ends of the connecting shell 81, there are limit abutting plates 82 fixedly connected. The two limit abutting plates 82 respectively abut against the two first perforated plates 52. At the positions of the connecting shell 81 corresponding to the plurality of guide rods 4, there are plungers 83 fixedly connected. At the same guide rod 4, the two connecting rods 9 are rotatably connected to the movable ends of the plungers 83. There is a multi-head connecting pipe 84 fixedly connected through the side wall of the connecting shell 81. The rodless chambers of the plurality of plungers 83 are communicated with the multi-head connecting pipe 84. The multi-head connecting pipe 84 is externally connected to a pressure source, which is used to pressurize the inside of the plungers 83. On the side wall of the rod chamber of each plunger 83, there is a pressure sensor 85 fixedly installed, which is used to detect the pressure inside the plunger 83, so as to control the pre-tightening force applied by the multi-directional piston mechanism 8 to the pre-tightening plate mechanism 5.

[0036] Specifically, before rectification, packing is filled into the upper and lower packing layers. A flexible isolation cover (not shown in the figure) is provided between the upper packing plate 2 and the first perforated plate 52, and between the lower packing plate 3 and another first perforated plate 52, so as to isolate the packing from the inner wall of the rectification column 1. It should be noted that the guide rod 4 is outside the flexible isolation cover, and multiple holes of the first perforated plate 52 itself are inside the flexible isolation cover. Then, through an external pressure source and a multi-head connecting pipe 84, the inside of the rodless chambers of multiple plungers 83 is pressurized, so that the movable ends of the plungers 83 extend and push two connecting rods 9. The two connecting rods 9 are arranged at a certain angle. When the two connecting rods 9 rotate, the angle between them increases and they respectively push two connecting rings 51 to move along the guide rod 4, so that the two connecting rings 51 move away from each other and respectively press the packing. And the pressure in the plunger 83 is detected by a pressure sensor 85 to facilitate the control of the applied pre-tightening force.

[0037] When rectifying isooctyl thioglycolate, packing is filled into the upper and lower packing layers. The liquid is introduced through the liquid inlet pipe 14 at the upper end of the side wall of the rectification column 1, and then enters the multi-perforated pipe 16 and evenly distributes and then falls. The steam is introduced through the steam inlet 13 at the lower end of the side wall of the rectification column 1. The steam and the liquid carry out mass transfer and heat transfer in the upper and lower packing layers. During the long-term use of the equipment, if the packing deforms, resulting in the packing collapsing and changing the stacking state, and large cavities are generated in some areas of the packing layer, the pre-tightening force applied by the multi-directional piston mechanism 8 can continue to drive the pre-tightening plate mechanism 5 to further press the packing through the connecting rod 9, eliminating the large cavities. At this time, the pressure in the plunger 83 decreases, and the pressure sensor 85 detects the pressure change, and the pressure is replenished again through the external pressure source to ensure that the packing is fully pressed and to cope with the further collapse of the packing. When the packing is severely deformed, the packing is replaced.

[0038] As Figure 7 - Figure 10 As shown in the figure, a plurality of sliding grooves 511 are formed on the end surface of each connecting ring 51. At positions corresponding to the plurality of sliding grooves 511 on the end surface of each first perforated plate 52, a slider 522 is fixedly connected. A ball 523 is embedded in the bottom surface of each slider 522, and each ball 523 rolls inside the corresponding sliding groove 511. Through the sliding groove 511 and the ball 523, the first perforated plate 52 can rotate within the range of the sliding groove 511.

[0039] At positions corresponding to the plurality of guide rods 4 on the end surface of each connecting ring 51, an installation groove 512 is formed. At the bottom of each installation groove 512, a first spur gear 513 is rotatably connected. On the side wall of each first perforated plate 52, a first tooth groove 521 is circumferentially formed. The first spur gear 513 and the first tooth groove 521 are in meshing transmission. A stirring rod 524 is fixedly connected to the end surface of each first perforated plate 52 for separating the adhered packing.

[0040] A second tooth groove 41 is formed in the side wall of each guide rod 4. One end of the rotating shaft of each first spur gear 513 is fixedly connected with a first bevel gear 514. Two sides of the top end of each mounting groove 512 are fixedly connected with brackets 515. A second spur gear 516 is rotatably connected between the side walls of the two brackets 515 of the same mounting groove 512. Each second spur gear 516 is in meshing transmission with the second tooth groove 41. A second bevel gear 517 is fixedly connected to the rotating shaft of each second spur gear 516. Each second bevel gear 517 is in meshing transmission with the first bevel gear 514 in the corresponding mounting groove 512.

[0041] Specifically, when the connecting ring 51 slides along the guide rod 4, the second bevel gear 517 can be driven to rotate by the meshing of the second spur gear 516 and the second tooth groove 41. Further, the first spur gear 513 is driven to rotate by the meshing of the second bevel gear 517 and the first bevel gear 514 for driving the rotation of the first perforated plate 52. When the first spur gear 513 is in meshing transmission with the first tooth groove 521, the first perforated plate 52 drives the stirring rod 524 to rotate. Since the packing is in a compressed state, at this time, the stirring rod 524 can drive the whole packing to twist, causing the adhered packing to move and separate, and at the same time, when a cavity is generated due to the collapse of the packing, the packing can be rearranged so that the cavity area is refilled.

[0042] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rectification device for the preparation of isooctyl thioglycolate, comprising a rectification column (1), wherein an upper packing plate (2) and a lower packing plate (3) are fixedly connected inside the rectification column (1), and it is characterized in that: A plurality of guide rods (4) are fixedly connected between the upper packing plate (2) and the lower packing plate (3). A support block (6) is fixedly connected to each guide rod (4). Two pre-tightening plate mechanisms (5) are slidably connected to the plurality of guide rods (4) together. The two pre-tightening plate mechanisms (5) are arranged in a mirror image at both ends of the plurality of support blocks (6). The two pre-tightening plate mechanisms (5) and the plurality of support blocks (6) are elastically connected by springs (7). A multi-directional piston mechanism (8) is arranged between the two pre-tightening plate mechanisms (5). A plurality of link groups are rotatably connected to the multi-directional piston mechanism (8). Each link group includes two links (9). One ends of the two links (9) in the same link group are respectively rotatably connected to the two pre-tightening plate mechanisms (5). The two pre-tightening plate mechanisms (5) are connected by a plurality of telescopic tubes (10). Each pre-tightening plate mechanism (5) includes a connecting ring (51). The two connecting rings (51) are both slidably connected through the plurality of guide rods (4). A first porous plate (52) is rotatably connected to one side of each of the two connecting rings (51) facing away from each other. Installation grooves (512) are formed in the end faces of each connecting ring (51) corresponding to the positions of the plurality of guide rods (4). A first spur gear (513) is rotatably connected to the bottom of each installation groove (512). First tooth grooves (521) are formed in the side walls of each first porous plate (52) along the circumferential direction. The first spur gear (513) is in meshing transmission with the first tooth groove (521). A stirring rod (524) is fixedly connected to the end face of each first porous plate (52).

2. The rectification equipment for the preparation of isooctyl thioglycolate according to claim 1, characterized in that: An upper packing layer is formed between one of the pre-tightening plate mechanisms (5) and the upper packing plate (2), and a lower packing layer is formed between the other pre-tightening plate mechanism (5) and the lower packing plate (3). Both the upper packing layer and the lower packing layer are filled with packing.

3. A rectification device for the preparation of isooctyl thioglycolate according to claim 1, characterized in that: Second porous plates (53) are fixedly connected to one side of the two connecting rings (51) adjacent to each other. Both ends of the plurality of telescopic tubes (10) are connected to the openings of the two second porous plates (53).

4. A rectification device for the preparation of isooctyl thioglycolate according to claim 3, characterized in that: The multi-directional piston mechanism (8) includes a connecting shell (81). Limit abutting plates (82) are fixedly connected to both ends of the connecting shell (81). The two limit abutting plates (82) are respectively abutted against the two first porous plates (52). Plungers (83) are fixedly connected to the side wall of the connecting shell (81) corresponding to the positions of the plurality of guide rods (4). The two links (9) at the same guide rod (4) are respectively rotatably connected to the movable ends of the plungers (83). A multi-head connecting pipe (84) is fixedly connected through the side wall of the connecting shell (81). The rodless cavities of the plurality of plungers (83) are all communicated with the multi-head connecting pipe (84). A pressure sensor (85) is fixed to the side wall of the rod chamber of each plunger (83).

5. The rectification equipment for the preparation of isooctyl thioglycolate according to claim 3, characterized in that: A plurality of sliding grooves (511) are formed in the end faces of each of the connecting rings (51). At positions corresponding to the plurality of sliding grooves (511) on the end faces of each of the first perforated plates (52), sliders (522) are fixedly connected. Ball bearings (523) are embedded in the bottom surfaces of each of the sliders (522), and each of the ball bearings (523) rolls inside the corresponding sliding groove (511).

6. The rectification equipment for the preparation of isooctyl thioglycolate according to claim 3, characterized in that: Second tooth grooves (41) are formed in the side walls of each of the guide rods (4). One end of the rotating shaft of each of the first spur gears (513) is fixedly connected with a first bevel gear (514). Brackets (515) are fixedly connected to both sides of the top end of each of the mounting grooves (512). A second spur gear (516) is rotatably connected between the side walls of the two brackets (515) of the same mounting groove (512). Each of the second spur gears (516) is in meshing transmission with the second tooth groove (41). A second bevel gear (517) is fixedly connected to the rotating shaft of each of the second spur gears (516). Each of the second bevel gears (517) is in meshing transmission with the first bevel gear (514) in the corresponding mounting groove (512).

7. A rectification apparatus for the preparation of isooctyl thioglycolate according to claim 1, characterized in that: A steam outlet (11) is provided at the top end of the rectifying column (1). A discharge pipe (12) is fixedly connected through the bottom end of the rectifying column (1). A steam inlet (13) is provided at the lower end of the side wall of the rectifying column (1). A liquid inlet pipe (14) is fixedly connected through the upper end of the side wall of the rectifying column (1). A demister (15) and a perforated pipe row (16) are fixedly connected inside the rectifying column (1). The demister (15) is arranged above the perforated pipe row (16). The perforated pipe row (16) is arranged above the upper packing plate (2). The liquid inlet pipe (14) is communicated with the perforated pipe row (16).

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