Preparation device and preparation method of isooctyl thioglycolate

Abstract

The invention relates to a preparation device and a preparation method of isooctyl thioglycolate, in particular to the technical field of preparation of chemical intermediates.A synthesis tank and a stirring mechanism are arranged, and the stirring mechanism is placed in a synthesis space of the synthesis tank; raw materials of isooctyl thioglycolate to be synthesized are put into a synthesis space of a synthesis tank according to a set molar ratio, a first driving part arranged outside the synthesis tank is connected with the part, extending out of the synthesis space, of a first stirring part, and the free end of the first stirring part is connected with a second stirring part through a cross universal joint; the sliding part is slidably arranged on the periphery of the first stirring part in a sleeving mode, and when the sliding part can slide along the first stirring part to be clamped with the cross universal joint, the first driving part is used for driving the first stirring part to drive the sliding part and the second stirring part to rotate; and different areas in the synthesis space can be stirred, and mercaptoacetic acid and isooctanol can be uniformly dispersed, so that the preparation efficiency of isooctyl thioglycolate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of chemical intermediates, and particularly to a preparation device and a preparation method of isooctyl thioglycolate. Background Art

[0002] As an important chemical intermediate, isooctyl thioglycolate has a wide range of applications in the fields of medicine, pesticides, dyes, etc. With the rapid development of the chemical industry, the preparation process of isooctyl thioglycolate has also undergone continuous improvement and optimization. From the initial simple reaction to the current refined production, significant progress has been made in aspects such as reaction condition control, raw material purity requirements, and equipment improvement.

[0003] At present, the preparation of isooctyl thioglycolate mainly adopts the method of esterification reaction between thioglycolic acid and isooctyl alcohol. In a typical preparation process, thioglycolic acid and isooctyl alcohol are mixed in a certain proportion and refluxed under the catalysis of an acidic catalyst. During the reaction process, continuous stirring is required to promote the full contact of the reactants, and at the same time, the reaction conditions are optimized by controlling the temperature and time. After the reaction, through post-treatment steps such as neutralization, extraction, and distillation, the target product isooctyl thioglycolate is finally obtained.

[0004] In the prior art, when preparing isooctyl thioglycolate, when thioglycolic acid and isooctyl alcohol are usually mixed, it is often necessary to carry out stirring and reflux under the protection of nitrogen and heating to 100°C - 120°C. However, during the stirring and mixing process, a single-axis stirrer is usually used to stir clockwise or counterclockwise. Although this stirring method can achieve the mixing function of thioglycolic acid and isooctyl alcohol, during the mixing process, the formed flow field is mostly a regular laminar flow field. The existence of the laminar flow field will cause the mixing process of the mixed fluid formed by thioglycolic acid and isooctyl alcohol to mainly rely on molecular diffusion. Since molecular diffusion usually occurs in the laminar flow field where the corresponding molecules are located, this will cause the mixture to form a stratified structure or incomplete mixing phenomenon. The existence of this phenomenon will affect the esterification reaction efficiency and the yield of isooctyl thioglycolate. Summary of the Invention

[0005] The main object of the present invention is to propose a preparation device and a preparation method of isooctyl thioglycolate, aiming to solve the problem that in the process of stirring and mixing thioglycolic acid and isooctyl alcohol in the related art, due to the existence of the laminar flow field, the molecules in each laminar flow field will diffuse in their respective laminar flow fields, which will cause the mixture to form a stratified structure or incomplete mixing phenomenon, that is, it will affect the esterification reaction efficiency and the yield of isooctyl thioglycolate.

[0006] To achieve the above object, a preparation device of isooctyl thioglycolate proposed by the present invention includes: A synthesis tank, a synthesis space for synthesizing isooctyl mercaptoacetate is formed inside the synthesis tank, and a feed port, a mounting hole and a discharge port which are spaced apart and communicated with the synthesis space are formed on the synthesis tank; and, A stirring mechanism, the stirring mechanism is arranged in the synthesis space, the stirring mechanism includes a first stirring member, a second stirring member and a sliding member, two ends of the first stirring member are respectively a driving end and a rotating end, the driving end rotatably passes through the mounting hole and extends out of the synthesis space, the driving end is in shaft transmission connection with an output shaft of a first driving member installed on the top of the synthesis tank, the rotating end is rotatably connected with the second stirring member through a cross universal joint, the sliding member is slidably installed on the first stirring member, and the sliding member can slide along the first stirring member to be engaged with or disengaged from the cross universal joint, so as to correspondingly make the first stirring member and the second stirring member rotate coaxially in the synthesis space or make the second stirring member and the first stirring member rotate with variable axes in the synthesis space, and synthesize the isooctyl mercaptoacetate.

[0007] In an embodiment, the first stirring member includes: A first driving shaft, two ends of the first driving shaft are respectively the driving end and the rotating end, a through hole is formed inside the first driving shaft, a waist-shaped hole is formed on the first driving shaft, the waist-shaped hole is communicated with the through hole, and the waist-shaped hole extends along the direction from the driving end to the rotating end; A first stirring assembly, the first stirring assembly is installed on the outer periphery of the first driving shaft close to the driving end; and, A driving assembly, the driving assembly is installed in the through hole, and a free end of the driving assembly is arranged towards the rotating end along the through hole, at least part of the sliding member is slidably inserted into the waist-shaped hole and is in rotational cooperation with an output shaft of the driving assembly, and the driving assembly can drive the sliding member to slide along the first driving shaft to be engaged with or disengaged from the cross universal joint.

[0008] In an embodiment, the driving assembly includes: A second driving member, the second driving member is installed in the through hole, and the second driving member is arranged close to the driving end; A telescopic rod, the telescopic rod is slidably accommodated in the through hole, and the telescopic rod is installed at an output end of the second driving member; and, A connecting block, which is connected to the telescopic rod. The connecting block is in sliding fit with the inner wall of the through hole. The sliding member is connected to the connecting block. The second driving member can drive the connecting block to slide through the telescopic rod, so that the sliding member slides along the first driving shaft to engage or disengage with the cross universal joint.

[0009] In one embodiment, the first stirring assembly includes a second shaft sleeve fixed to the outer periphery of the first driving shaft, and a plurality of first stirring blades are arranged on the outer periphery of the second shaft sleeve at intervals in the circumferential direction.

[0010] In one embodiment, the sliding member includes: A third shaft sleeve slidably sleeved on the outer periphery of the first driving shaft. The inner wall of the third shaft sleeve corresponding to the kidney-shaped hole bulges inward to be connected to the connecting block; Two first connecting rods are oppositely and spacedly installed on the outer periphery of the third shaft sleeve, and both of the two first connecting rods extend away from the driving end along the extending direction of the first driving shaft; Two U-shaped locking blocks are respectively connected to one of the first connecting rods, and the two U-shaped locking blocks are symmetrically arranged on the outer periphery of the first driving shaft. Locking grooves capable of engaging the cross universal joint are arranged on both of the two U-shaped locking blocks; and, At least two limiting protrusions are respectively arranged at the notch positions of the two locking grooves, and each of the limiting protrusions can limit the second stirring member from rotating out of the corresponding locking groove from the locking groove.

[0011] In one embodiment, second stirring blades are also arranged on the outer periphery of the third shaft sleeve at intervals in the circumferential direction.

[0012] In one embodiment, the second stirring member includes: A second driving shaft, one end of which is connected to the cross universal joint, and the other end of the second driving shaft extends away from the cross universal joint to form a stirring end; and, A first stirring ball is installed at the stirring end. A first accommodating cavity for accommodating an external catalyst is formed in the stirring ball, and a plurality of first holes are formed on the sphere of the first stirring ball at intervals and are all communicated with the first accommodating cavity; The first driving member can drive the second driving shaft through the first driving shaft to drive the first stirring ball to stir the raw material solution for making isooctyl mercaptoacetate in the synthesis space, and make isooctyl mercaptoacetate.

[0013] In one embodiment, a plurality of mounting positions are further provided on the first stirring ball and are circumferentially spaced apart; The second stirring member further includes: A plurality of second connecting rods, the number of the second connecting rods is the same as that of the mounting positions and they are connected one by one, and the lengths of all the second connecting rods are different; and; A plurality of second stirring balls, a second accommodating cavity is formed in each of the second stirring balls, and a plurality of second holes which are spaced apart and communicate with the second accommodating cavity are formed on the sphere of each of the second stirring balls. The number of the second stirring balls is the same as that of the second connecting rods and they are arranged in one-to-one correspondence at one ends of the second connecting rods far away from the corresponding mounting positions; The first stirring ball can drive the corresponding second stirring ball to rotate in the synthesis space through all the second connecting rods and stir the raw materials to prepare the isooctyl mercaptoacetate.

[0014] In one embodiment, the second stirring member further includes a fourth shaft sleeve mounted on the second driving shaft. The fourth shaft sleeve is in interference fit with the second driving shaft, and a plurality of third stirring blades are arranged on the fourth shaft sleeve and are circumferentially spaced apart.

[0015] Based on the same technical concept, in a second aspect, the present invention further provides a preparation method of isooctyl mercaptoacetate, which applies the preparation device of isooctyl mercaptoacetate described in the first aspect; The preparation process of the isooctyl mercaptoacetate includes the following steps: Install a three-way pipe at the position of the feed port; the three-way pipe has a first inlet, a second inlet and a third inlet, and a cooling reflux device is installed on the first inlet; Put mercaptoacetic acid and isooctanol into the synthesis space from the feed port according to a molar ratio of 1:1.1 to 1:1.3 through the second inlet; Introduce an inert gas into the synthesis space through the third inlet and heat the synthesis space to a target temperature; Control the stirring mechanism to stir the synthesis space so that the mercaptoacetic acid and isooctanol carry out an esterification reaction under the action of a catalyst; Cool and reflux through the cooling reflux device to prepare the isooctyl mercaptoacetate.

[0016] The technical solution of the present invention is to set up a synthesis tank and a stirring mechanism. When in use, the stirring mechanism composed of a first stirring component, a second stirring component and a sliding component is placed in the synthesis space of the synthesis tank, and the driving end of the first stirring component extends out of the synthesis space. At the same time, the raw materials mercaptoacetic acid and isooctanol to be synthesized into isooctyl mercaptoacetate are put into the synthesis space of the synthesis tank according to a set molar ratio. Then, the first driving member arranged outside the synthesis tank is connected to the part of the first stirring component extending out of the synthesis space, and the free end of the first stirring component is connected to the second stirring component through a cross universal joint. At the same time, the sliding component is slidably sleeved on the outer periphery of the first stirring component, and when the sliding component can slide along the first stirring component to engage with the cross universal joint, the first driving member is used to drive the first stirring component to drive the sliding component and the second stirring component to rotate, so that the present invention has the function of stirring the synthesis space, and then it can make mercaptoacetic acid and isooctanol mix in the synthesis space and can undergo an esterification reaction under the action of a catalyst by heating. On this basis, the sliding component can be further slid along the first stirring component to disengage from the cross universal joint, so that the second stirring component and the first stirring component can rotate with variable axes in the synthesis space, and then the present invention can use the variable-axis stirring function of the second stirring component to stir different regions in the synthesis space, realizing the function of destroying the laminar flow field in the synthesis space, and then it can make mercaptoacetic acid and isooctanol evenly dispersed, improving the mixing effect of mercaptoacetic acid and isooctanol, and ensuring the esterification reaction efficiency and the yield of isooctyl mercaptoacetate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0018] Figure 1 It is a schematic structural diagram of the preparation device for isooctyl mercaptoacetate provided by the present invention; Figure 2 For Figure 1 a schematic structural diagram of the stirring mechanism exemplified in Figure 3 For Figure 2 a schematic structural diagram of the internal structure of the stirring mechanism exemplified in Figure 4 For Figure 3 a schematic enlarged structural diagram of part A exemplified in Figure 5 For Figure 2Schematic structural diagram of the first drive shaft and the second drive shaft in the engaged state in the example; Figure 6 is Figure 5 Schematic internal structure diagram; Figure 7 is Figure 5 Schematic connection structure diagram of the first drive shaft and the second drive shaft in the example; Figure 8 is Figure 7 Schematic internal structure diagram; Figure 9 is Figure 8 Schematic structural diagram of the first stirring ball and the second stirring ball in the example; Figure 10 Flow chart of the preparation method of isooctyl mercaptoacetate in the example of the present invention.

[0019] Explanation of the reference numerals in the drawings: 100, synthesis tank; 120, feed inlet; 130, mounting hole; 140, discharge port; 200, stirring mechanism; 210, first stirring member; 220, second stirring member; 230, sliding member; 211, driving end; 212, rotating end; 240, first driving member; 250, cross universal joint; 213, first drive shaft; 214, through hole; 215, kidney-shaped hole; 216, first stirring assembly; 217, driving assembly; 2171, second driving member; 2172, telescopic rod; 2173, connecting block; 2161, second shaft sleeve; 2162, first stirring blade; 231, third shaft sleeve; 232, first connecting rod; 233, U-shaped locking block; 234, limiting projection; 235, second stirring blade; 221, second drive shaft; 222, first stirring ball; 223, first accommodating cavity; 224, first hole; 225, second connecting rod; 226, second stirring ball; 227, second accommodating cavity; 228, second hole; 229, fourth shaft sleeve; 260, third stirring blade; 280, fastening member; 281, guiding sleeve; 282, return spring; 283, engaging ball; 284, card slot; 218, protrusion.

[0020] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0021] 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the protection scope of the present invention.

[0022] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture. If the specific posture changes, then the directional indications will also change accordingly.

[0023] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] The present invention provides an apparatus and a preparation method for isooctyl thioglycolate.

[0025] Please refer to Figures 1 to 10, in an embodiment of the present invention, the preparation device for isooctyl thioglycolate includes a synthesis tank 100 and a stirring mechanism 200. A synthesis space for synthesizing isooctyl thioglycolate is formed inside the synthesis tank 100. The synthesis tank 100 is formed with a feed port 120, a mounting hole 130, and a discharge port 140 that are spaced apart and all communicate with the synthesis space. The stirring mechanism 200 is disposed inside the synthesis space. The stirring mechanism 200 includes a first stirring member 210, a second stirring member 220, and a sliding member 230. The two ends of the first stirring member 210 are respectively a driving end 211 and a rotating end 212. The driving end 211 rotatably passes through the mounting hole 130 and extends out of the synthesis space. The driving end 211 is in shaft transmission connection with the output shaft of a first driving member 240 installed on the top of the synthesis tank 100. The rotating end 212 is rotatably connected to the second stirring member 220 through a cross universal joint 250. The sliding member 230 is slidably installed on the first stirring member 210, and the sliding member 230 can slide along the first stirring member 210 to engage or disengage with the cross universal joint 250, so as to correspondingly make the first stirring member 210 and the second stirring member 220 rotate coaxially in the synthesis space or make the second stirring member 220 and the first stirring member 210 rotate with variable axes in the synthesis space, and synthesize isooctyl thioglycolate.

[0026] Specifically, the two ends of the first stirring member 210 are respectively a driving end 211 and a rotating end 212. The driving end 211 rotatably passes through the mounting hole 130 and extends out of the synthesis space. The driving end 211 is in shaft transmission connection with the output shaft of a first driving member 240 installed on the top of the synthesis tank 100. The rotating end 212 is rotatably connected to the second stirring member 220 through a cross universal joint 250. The sliding member 230 is slidably installed on the first stirring member 210, and the sliding member 230 can slide along the first stirring member 210 to engage or disengage with the cross universal joint 250, so as to correspondingly make the first stirring member 210 and the second stirring member 220 rotate coaxially in the synthesis space or make the second stirring member 220 and the first stirring member 210 rotate with variable axes in the synthesis space, and synthesize isooctyl thioglycolate. The driving end 211 of the first stirring member 210 passes through the mounting hole 130 and extends to the outside of the synthesis tank 100 and is connected to the output shaft of the first driving member 240 to achieve power transmission. At the same time, the rotating end 212 of the first stirring member 210 is rotatably connected to the second stirring member 220 through the cross universal joint 250, so that the first stirring member 210 and the second stirring member 220 can work together.

[0027] For better understanding of the present invention, during specific use, the sliding member 230 can slide on the first stirring member 210. When the sliding member 230 slides to engage with the cross universal joint 250, the first stirring member 210 and the second stirring member 220 will rotate coaxially. At this time, the stirring mechanism 200 can stir the mercaptoacetic acid and isooctanol in the synthesis space and complete preliminary mixing. On this basis, then make the sliding member 230 slide to disengage from the cross universal joint 250. At this time, the rotation axis of the second stirring member 220 and the rotation axis of the first stirring member 210 are in a variable-axis rotation state where they are not on the same axis. By changing the central axis of the rotation axes of the first stirring member 210 and the second stirring member 220, in the specific implementation process of the present invention, without additionally increasing a driving mechanism, through the variable-axis rotation function of the second stirring member 220, it is possible to increase the flow and collision opportunities of reactant molecules in different regions, promote the full contact and reaction between mercaptoacetic acid and isooctanol, and improve the synthesis efficiency and product quality of isooctyl mercaptoacetate.

[0028] It should be specifically and clearly noted that, in this embodiment, the exemplary synthesis tank 100 can be a metal tank body with a water bath heating or direct heating function in the prior art, or a high-temperature resistant tank body with a heat preservation function while having a heating function. In this embodiment, only the application is carried out, and the material of the synthesis tank 100 itself is not improved or designed. Therefore, it will not be elaborated one by one here. Of course, in this embodiment, the exemplary first driving member 240 is preferably a driving motor in the prior art that can drive the stirring mechanism 200 to rotate and perform stirring operations.

[0029] In this embodiment, by providing a synthesis tank 100 and a stirring mechanism 200, during use, the stirring mechanism 200 composed of a first stirring member 210, a second stirring member 220 and a sliding member 230 is placed in the synthesis space of the synthesis tank 100, and the driving end 211 of the first stirring member 210 extends out of the synthesis space. At the same time, the raw materials mercaptoacetic acid and isooctyl alcohol for synthesizing isooctyl mercaptoacetate are put into the synthesis space of the synthesis tank 100 according to a set molar ratio. Then, a first driving member 240 provided outside the synthesis tank 100 is connected to the part of the first stirring member 210 extending out of the synthesis space, and the free end of the first stirring member 210 is connected to the second stirring member 220 through a cross universal joint 250. At the same time, the sliding member 230 is slidably sleeved on the outer periphery of the first stirring member 210, and when the sliding member 230 can slide along the first stirring member 210 to engage with the cross universal joint 250, the first driving member 240 is used to drive the first stirring member 210 to drive the sliding member 230 and the second stirring member 220 to rotate, so that the present invention has the function of stirring the synthesis space, and thus can make mercaptoacetic acid and isooctyl alcohol mix in the synthesis space and heat up to undergo an esterification reaction under the action of a catalyst. On this basis, the sliding member 230 is further enabled to slide along the first stirring member 210 to disengage from the cross universal joint 250, so that the second stirring member 220 and the first stirring member 210 rotate with variable axes in the synthesis space, and thus the present invention can utilize the variable-axis stirring function of the second stirring member 220 to stir different regions in the synthesis space, realizing the function of destroying the laminar flow field in the synthesis space, and thus can make mercaptoacetic acid and isooctyl alcohol evenly dispersed, improving the mixing effect of mercaptoacetic acid and isooctyl alcohol, and ensuring the esterification reaction efficiency and the yield of isooctyl mercaptoacetate.

[0030] Please continue to refer to Figures 5 to 8, in one embodiment, the first stirring member 210 includes a first drive shaft 213, a first stirring assembly 216, and a drive assembly 217. The two ends of the first drive shaft 213 are respectively a drive end 211 and a rotating end 212. A through hole 214 is formed in the first drive shaft 213, and a kidney-shaped hole 215 is formed on the first drive shaft 213. The kidney-shaped hole 215 communicates with the through hole 214 and extends along the direction from the drive end 211 to the rotating end 212. The first stirring assembly 216 is installed on the outer periphery of the first drive shaft 213 near the drive end 211, and the drive assembly 217 is installed in the through hole 214, and the free end of the drive assembly 217 is arranged towards the rotating end 212 along the through hole 214. At least part of the sliding member 230 is slidably inserted into the kidney-shaped hole 215 and rotatably cooperates with the output shaft of the drive assembly 217. The drive assembly 217 can drive the sliding member 230 to slide along the first drive shaft 213 to engage or disengage with the cross universal joint 250.

[0031] Specifically, the first drive shaft 213 serves as the main structure. Through the through hole 214 and the kidney-shaped hole 215 formed inside the first drive shaft 213, it provides installation and movement spaces for the drive assembly 217 and the sliding member 230. The first stirring assembly 216 is installed on the outer periphery of the first drive shaft 213 and can directly participate in the stirring process to improve the stirring efficiency. The drive assembly 217 is installed in the through hole 214, and the free end of the drive assembly 217 is arranged towards the rotating end 212 of the first drive shaft 213. At the same time, part of the sliding member 230 is inserted into the kidney-shaped hole 215 and rotatably cooperates with the output shaft of the drive assembly 217. By controlling the sliding of the sliding member 230 through the drive assembly 217, the engagement or disengagement state between the sliding member 230 and the cross universal joint 250 can be adjusted. When the sliding member 230 engages with the cross universal joint 250, the first stirring member 210 and the second stirring member 220 maintain coaxial rotation, which is suitable for the initial stirring stage; when the sliding member 230 disengages from the cross universal joint 250, the second stirring member 220 starts to rotate with a variable axis relative to the first stirring member 210, effectively destroying the laminar flow field in the synthesis space.

[0032] In some specific embodiments, the driving assembly 217 includes a second driving member 2171, a telescopic rod 2172, and a connecting block 2173. The second driving member 2171 is installed in the through hole 214 and is disposed close to the driving end 211. The telescopic rod 2172 is slidably received in the through hole 214 and is installed at the output end of the second driving member 2171. The connecting block 2173 is connected to the telescopic rod 2172, and the connecting block 2173 is in sliding fit with the inner wall of the through hole 214. The sliding member 230 is connected to the connecting block 2173. The second driving member 2171 can drive the connecting block 2173 to slide through the telescopic rod 2172, so that the sliding member 230 slides along the first driving shaft 213 to engage or disengage with the cross universal joint 250.

[0033] Specifically, the second driving member 2171 serves as a power source, is installed in the through hole 214 and is disposed close to the driving end 211. The telescopic rod 2172 is connected to the output end of the second driving member 2171 and can slide in the through hole 214 under the drive of the second driving member 2171. By connecting with the telescopic rod 2172, the connecting block 2173 can also slide in the through hole 214. The connecting block 2173 is in sliding fit with the inner wall of the through hole 214, and at least a part of the sliding member 230 passes through the kidney-shaped hole 215 and is connected to the connecting block 2173. Further, when the second driving member 2171 drives the connecting block 2173 to slide through the telescopic rod 2172, the connecting block 2173 will drive the sliding member 230 to slide along the first driving shaft 213 under the limiting action of the kidney-shaped hole 215, and finally realize the function of engaging or disengaging with the cross universal joint 250.

[0034] It should be further clarified that the second driving member 2171 exemplified in this embodiment is preferably a cylinder or a servo motor. It is only applied in this embodiment and no improvement design is made thereto, so it will not be elaborated herein one by one.

[0035] Please continue to refer to Figure 3 , in an embodiment, the first stirring assembly 216 includes a second bushing 2161. The second bushing 2161 is fixed to the outer periphery of the first driving shaft 213, and a plurality of first stirring blades 2162 are disposed on the outer periphery of the second bushing 2161 at intervals in the circumferential direction.

[0036] Specifically, the second bushing 2161 is fixedly installed on the outer periphery of the first drive shaft 213 and rotates synchronously with the first drive shaft 213 during the stirring operation. A plurality of first stirring blades 2162 are arranged at intervals in the circumferential direction on the outer periphery of the second bushing 2161. By arranging a plurality of first stirring blades 2162 at intervals in the circumferential direction on the second bushing 2161, the present invention can make full use of the circumferential space during specific use, form a plurality of stirring action points, and improve the stirring efficiency.

[0037] Of course, in order to better implement the present invention, during the specific implementation process, when the axis needs to be switched, the movement of the first driving member 240 can be stopped first. When the first drive shaft 213 stops moving, the second drive member 2171 is started, and the second drive member 2171 drives the telescopic rod 2172 to move, thereby driving the sliding member 230 to slide away from the cross universal joint 250, and finally realizing a variable-axis movement mode in which the first drive shaft 213 and the second drive shaft 221 are not on the same axis. When the variable-axis stirring is completed or after the esterification reaction of the current batch of isooctyl mercaptoacetate is completed, the second drive member 2171 can be used to drive the telescopic rod 2172 to drive the sliding member 230 to slide to engage with the cross universal joint 250 when the first drive member 240 stops moving and the first drive shaft 213 stops rotating.

[0038] It can be further clarified that the second bushing 2161, as the installation carrier of the first stirring blade 2162, not only simplifies the installation process of the first stirring blade 2162, but also enhances the structural stability.

[0039] Please continue to refer to Figure 3 、 Figure 4 , in an embodiment, the sliding member 230 includes a third bushing 231, two first connecting rods 232, two U-shaped locking blocks 233, and at least two limiting protrusions 234. The third bushing 231 is slidably sleeved on the outer periphery of the first drive shaft 213. The inner wall of the third bushing 231 corresponding to the kidney-shaped hole 215 protrudes inward 218 to be connected to the connecting block 2173. The two first connecting rods 232 are oppositely and spacedly installed on the outer periphery of the third bushing 231, and both of the two first connecting rods 232 extend in the extending direction of the first drive shaft 213 away from the drive end 211. The two U-shaped locking blocks 233 are respectively connected to one of the first connecting rods 232, and the two U-shaped locking blocks 233 are symmetrically arranged on the outer periphery of the first drive shaft 213. Locking grooves capable of engaging the cross universal joint 250 are provided on both of the two U-shaped locking blocks 233. At least two of the limiting protrusions 234 are respectively arranged at the openings of the two locking grooves, and each of the limiting protrusions 234 can limit the second stirring member 220 from rotating out of the corresponding locking groove from the locking groove.

[0040] Specifically, two first connecting rods 232 are installed on the outer periphery of the third bushing 231 relatively and at intervals, and the two connecting rods extend away from the driving end 211 along the extending direction of the first driving shaft 213. The spaced arrangement of the first connecting rods 232 helps to form a uniform force-bearing area in space. The extending direction of the first connecting rods 232 is parallel to that of the first driving shaft 213, so that the movement path of the sliding member 230 is stable during the sliding process and does not deviate.

[0041] Two U-shaped locking blocks 233 are respectively connected to one first connecting rod 232, and the two U-shaped locking blocks 233 are symmetrically arranged on the outer periphery of the first driving shaft 213. A locking groove capable of engaging with the cross universal joint 250 is provided on each U-shaped locking block 233. The locking groove is an important part of the U-shaped locking block 233. When the sliding member 230 moves axially along the first driving shaft 213 away from the driving end 211, the locking groove can engage with the cross universal joint 250, realizing the connection between the first stirring member 210 and the second stirring member 220. The cross universal joint 250 is limited within a stable movement track through the locking groove, thus ensuring the coaxial stirring function.

[0042] At least two limiting protrusions 234 are respectively arranged at the notch positions of the two locking grooves, and each limiting protrusion 234 can limit the second stirring member 220 from rotating out of the corresponding locking groove. The function of the limiting protrusion 234 is to impose an additional constraint on the engaged state, preventing the second stirring member 220 from loosening or disengaging from the locking groove under a relatively high rotational speed or a relatively large stirring force, and improving the stability of the overall structure.

[0043] When variable-axis stirring is required, the second driving member 2171 can be controlled to run in the reverse direction, so that the connecting block 2173 drives the third bushing 231 to slide towards the driving end 211, and the sliding member 230 moves accordingly, causing the locking groove to disengage from the cross universal joint 250. After the engagement is released, the second stirring member 220 starts to form a variable-axis rotation working mode with the first stirring member 210, and thus the present invention can effectively destroy the laminar flow field and improve the mixing uniformity of the reactants.

[0044] Certainly, in some improved embodiments, in order to further enhance the stability of the stirring mechanism 200 during the stirring process, for example, the through hole 214 is arranged to penetrate along the extending direction of the first drive shaft 213 and simultaneously penetrate through the connecting portion of the cross universal joint 250 connected to the rotating end 212. An engaging member 280 is further provided inside one end of the cross universal joint 250 connected to the rotating end 212. For example, the engaging member 280 includes two guiding sleeves 281. The two guiding sleeves 281 are opposite to each other and are respectively arranged on both sides of the through hole 214 located at the rotating end 212, and the central axis of the guiding sleeve 281 is perpendicular to the central axis of the through hole 214. A return spring 282 is respectively arranged inside the guiding sleeve 281, and a clamping ball 283 is arranged at the open end of each guiding sleeve 281. The clamping ball 283 can slide along the inner wall of the guiding sleeve 281.

[0045] During specific use, for example, one end of the second shaft sleeve 2161 facing the rotating end 212 is formed with a clamping groove 284 for the two clamping balls 283 to slide and engage respectively. When the second driving member 2171 drives the telescopic rod 2172 to rotate and makes the second shaft sleeve 2161 drive the sliding member 230 to slide to engage with the cross universal joint 250, at this time, under the linear movement of the second shaft sleeve 2161 along the telescopic rod 2172, the clamping groove 284 near the rotating end 212 of it will move to engage with the clamping ball 283, thereby restricting the separation of the sliding member 230 from the cross universal joint 250 and enhancing the stability of the stirring mechanism 200 during coaxial rotation.

[0046] Please continue to refer to Figure 3 , in an embodiment, the outer periphery of the third shaft sleeve 231 is further provided with second stirring blades 235 distributed at intervals along the circumferential direction.

[0047] Specifically, the third shaft sleeve 231 serves as the main structure of the sliding member 230. When the U-shaped locking block 233 connected to the third shaft sleeve 231 through two first connecting rods 232 engages with the cross universal joint 250, the second stirring blades 235 provided on the outer periphery of the third shaft sleeve 231 can rotate following the first drive shaft 213, thereby additionally stirring the reactants in the synthesis space. The second stirring blades 235 are distributed at intervals along the circumferential direction of the third shaft sleeve 231, forming uniform stirring action points and enhancing the stirring effect.

[0048] It can be further clarified that in this embodiment, the sliding of the exemplary third bushing 231 along the outer periphery of the first drive shaft 213 and the following sliding of the third bushing 231 should be understood as two working modes with a time sequence difference in working conditions. It can be further understood that when it is necessary to make the third bushing 231 slide along the first drive shaft 213, the second driving member 2171 installed in the first drive shaft 213 can be used to drive the telescopic rod 2172 to drive the third bushing 231 to slide along the first drive shaft 213 through the connecting block 2173, so that the U-shaped locking block 233 can be engaged with or disengaged from the cross universal joint 250, and then the function of coaxial rotation or variable-axis rotation can be realized between the first drive shaft 213 and the second stirring member 220. After the switching between the coaxial rotation and the variable-axis rotation between the first drive shaft 213 and the second stirring member 220 is completed, since the position of the third bushing 231 corresponding to the kidney-shaped hole on the first drive shaft 213 protrudes inward 218 to be connected to the connecting block 2173, it also makes the third bushing 231 and the first drive shaft 213 form a limit in the circumferential direction of the first drive shaft 213, and then the third bushing 231 can follow the first drive shaft 213 to rotate to realize the stirring function.

[0049] Please continue to refer to Figures 5 to 9 , in an embodiment, the second stirring member 220 includes a second drive shaft 221 and a first stirring ball 222. One end of the second drive shaft 221 is connected to the cross universal joint 250, and the other end of the second drive shaft 221 extends away from the cross universal joint 250 to form a stirring end. The first stirring ball 222 is installed at the stirring end. A first accommodation cavity 223 for accommodating an external catalyst is formed in the stirring ball, and a plurality of first holes 224 which are spaced apart and communicate with the first accommodation cavity 223 are formed on the sphere of each first stirring ball 222; the first driving member 240 can drive the second drive shaft 221 through the first drive shaft 213 to drive the first stirring ball 222 to stir the raw material solution for making isooctyl mercaptoacetate in the synthesis space, and make isooctyl mercaptoacetate.

[0050] Specifically, the second drive shaft 221 is the main structure of the second stirring member 220. One end of it is connected to the cross universal joint 250, and the other end extends to form a stirring end and is provided with a first stirring ball 222, so that the second drive shaft 221 can receive power from the first drive shaft 213 through the cross universal joint 250 and transmit it to the first stirring ball 222 at the stirring end.

[0051] In order to better implement the present invention, during specific implementation, the catalyst can be placed in the first accommodating cavity 223. By placing the catalyst in the first accommodating cavity 223, when the present invention stirs in the synthesis space, the second drive shaft 221 can be used to drive the first stirring ball 222 to move in the synthesis space, and the catalyst in the first stirring ball 222 can be in direct contact with mercaptoacetic acid and isooctanol in the synthesis space, so that mercaptoacetic acid and isooctanol can undergo an esterification reaction to form isooctyl mercaptoacetate. At the same time, during the stirring process, since the first stirring ball 222 will drive the catalyst to continuously change its position in the synthesis space, it also enables the present invention to ensure that the catalyst is in direct contact with mercaptoacetic acid and isooctanol at different positions during specific implementation. While mixing mercaptoacetic acid and isooctanol, the esterification reaction can be directly carried out, ensuring the mixing effect while also improving the catalytic efficiency.

[0052] Certainly, in this embodiment, it can be further clearly stated that in this embodiment, when the U-shaped locking block 233 of the sliding member 230 is engaged with the cross universal joint 250, the second drive shaft 221 and the first drive shaft 213 rotate coaxially, and the first stirring ball 222 rotates along a fixed trajectory to conventionally stir the reactants in the synthesis space.

[0053] When the U-shaped locking block 233 of the sliding member 230 is disengaged from the cross universal joint 250, the second drive shaft 221 and the first drive shaft 213 are in a state of variable-axis rotation, and the movement trajectory of the first stirring ball 222 becomes complex, forming a three-dimensional stirring effect. Since the second drive shaft 221 and the first drive shaft 213 present a variable-axis stirring state, it enables the first stirring ball 222 not only to stir the reactants but also to effectively disrupt the laminar flow field in the synthesis space, making the contact between the reactants and the catalyst more sufficient and further improving the reaction efficiency.

[0054] Please continue to refer to Figure 9, in one embodiment, a plurality of mounting positions are further provided on the first stirring ball 222 at circumferentially spaced intervals; the second stirring member 220 further includes a plurality of second connecting rods 225 and a plurality of second stirring balls 226. The number of the second connecting rods 225 is the same as that of the mounting positions and they are connected one by one, and the lengths of all the second connecting rods 225 are different. A second accommodating cavity 227 is formed in each of the second stirring balls 226, and a plurality of second holes 228 which are spaced apart and communicate with the second accommodating cavity 227 are formed on the spherical bodies of the second stirring balls 226. The number of the second stirring balls 226 is the same as that of the second connecting rods 225 and they are arranged in one-to-one correspondence at the ends of the second connecting rods 225 away from the corresponding mounting positions. The first stirring ball 222 can drive the corresponding second stirring balls 226 to rotate in the synthesis space through all the second connecting rods 225 and stir the raw materials to prepare the isooctyl mercaptoacetate.

[0055] Specifically, the plurality of mounting positions provided on the first stirring ball 222 at circumferentially spaced intervals provide a connection basis for the second connecting rods 225. The mounting positions are evenly distributed on the surface of the first stirring ball 222, ensuring the stable connection and balanced distribution of the second connecting rods 225.

[0056] On this basis, making the number of the second connecting rods 225 the same as that of the mounting positions and connecting them one by one can ensure that each mounting position has a corresponding second connecting rod 225, making the force transmission more balanced. It is particularly worth noting that the lengths of all the second connecting rods 225 are different. The unequal length design enables the second stirring balls 226 to be distributed at different radial positions, forming a three-dimensional distribution in space, which can stir the reactants in different regions of the synthesis space, avoiding the "dead zone" problem in the traditional stirring method and improving the destruction effect of the laminar flow field.

[0057] A second accommodating cavity 227 is formed in each of the second stirring balls 226 for accommodating the catalyst. This makes the second stirring balls 226 similar to the first stirring ball 222. A plurality of second holes 228 which are spaced apart and communicate with the second accommodating cavity 227 are also formed on the spherical bodies of the second stirring balls 226. The provided second holes 228 enable the reactants to fully contact the catalyst in the second accommodating cavity 227, and at the same time facilitate the diffusion of the reaction products. The number of the second stirring balls 226 is the same as that of the second connecting rods 225 and they are arranged in one-to-one correspondence at the ends of the second connecting rods 225 away from the corresponding mounting positions, thereby ensuring that each second connecting rod 225 has a corresponding second stirring ball 226 to form a complete stirring system.

[0058] In the coaxial stirring mode, the first stirring ball 222 and each second stirring ball 226 rotate along a fixed track to form a regular stirring field. At this time, the catalyst in the first stirring ball 222 and the catalyst in all the second stirring balls 226 contact the reactants through the holes on the balls, promoting the esterification reaction of thioglycolic acid and isooctyl alcohol. Due to the synergistic effect of multiple stirring balls, the reactants can fully contact the catalyst, thereby improving the reaction efficiency.

[0059] In the variable axis stirring mode, the motion trajectory of the first stirring ball 222 becomes complicated, driving each second stirring ball 226 to form a more complicated three-dimensional motion trajectory. This complicated motion mode can effectively destroy the laminar flow field in the synthesis space, make the contact between the reactants and the catalyst more complete, and further improve the reaction efficiency. In particular, due to the different lengths of the second connecting rod 225, each second stirring ball 226 is more widely distributed in the space, can cover more areas in the synthesis space, and make the stirring effect more uniform.

[0060] In one embodiment, the second stirring member 220 further includes a fourth sleeve 229 mounted on the second driving shaft 221 , the fourth sleeve 229 is interference fit with the second driving shaft 221 , and a plurality of third stirring blades 260 spaced apart along the circumferential direction are disposed on the fourth sleeve 229 .

[0061] Specifically, the fourth sleeve 229 is installed on the second drive shaft 221 and is tightly connected to the second drive shaft 221 by interference fit to ensure that there is no relative sliding between the fourth sleeve 229 and the second drive shaft 221 and can accurately follow the rotational movement of the second drive shaft 221.

[0062] The fourth shaft sleeve 229 is provided with a plurality of third stirring blades 260 spaced apart in the circumferential direction. The third stirring blades 260 are evenly distributed on the outer periphery of the fourth shaft sleeve 229, forming an additional stirring structure. When the second drive shaft 221 rotates, the fourth shaft sleeve 229 rotates therewith, driving the third stirring blades 260 to form a rotating stirring effect in the synthesis space. The third stirring blades 260 can perform additional stirring on the reactants in the synthesis space, thereby enhancing the stirring effect of the entire stirring system.

[0063] It should be particularly and clearly stated that the shape, size and distribution of the third stirring blade 260 can be adjusted according to actual needs. For example, stirring blades of different shapes such as straight blades, curved blades or spiral blades can be used to adapt to different stirring needs. At the same time, the number of the third stirring blades 260 can also be adjusted as needed, usually 3-8, evenly distributed on the periphery of the fourth shaft sleeve 229. These stirring blades can have the same or different shapes and sizes to form a more complex stirring effect.

[0064] Based on the same inventive concept, for the second aspect, please continue to refer to Figure 10 , the present invention also provides a method for preparing isooctyl thioglycolate, which uses the preparation device for isooctyl thioglycolate described in the first aspect; The preparation process of the isooctyl thioglycolate includes the following steps: S100. Install a three-necked tube at the position of the feed port.

[0065] Specifically, the three-necked tube has a first inlet, a second inlet, and a third inlet, and a cooling reflux device is installed on the first inlet.

[0066] In this step, first, a three-necked tube needs to be installed at the position of the feed port 120 of the preparation device. The three-necked tube has a first inlet, a second inlet, and a third inlet, and a cooling reflux device is installed on the first inlet. The installation of the three-necked tube needs to ensure a sealed connection with the feed port 120 to prevent the leakage of harmful gases during the reaction process. The cooling reflux device generally includes a condenser and a circulating water device. The condenser is internally provided with a spiral cooling tube, and the circulating water flows in the cooling tube, which can condense and reflux the isooctyl thioglycolate vapor generated during the reaction process back to the synthesis tank 100.

[0067] The installation height of the cooling reflux device should be appropriate. Generally, it is recommended that the bottom of the condenser be about 15 - 20 cm away from the reaction liquid level to ensure a good reflux effect. The water inlet of the cooling water should be located at the lower part of the condenser, and the water outlet should be located at the upper part to form countercurrent cooling and improve the cooling efficiency. The flow rate of the cooling water should be controlled at 2 - 3 liters per minute, and the temperature should be controlled within the range of 10 - 15 °C.

[0068] The material of the three-necked tube should be selected as corrosion-resistant borosilicate glass or polytetrafluoroethylene material to resist the corrosiveness of thioglycolic acid. Standard ground glass joints should be equipped at each interface of the three-necked tube to ensure a tight connection. The first inlet is used to connect the cooling reflux device, the second inlet is used to add reactants, and the third inlet is used to introduce inert gas and install monitoring devices such as thermometers.

[0069] S200. Put thioglycolic acid and isooctyl alcohol into the synthesis space from the feed port according to a molar ratio of 1:1.1 to 1:1.3 through the second inlet.

[0070] In this step, the reactants need to be added into the synthesis space through the second inlet of the three-necked tube. Specifically, first, accurately weigh thioglycolic acid and isooctyl alcohol and mix them according to a molar ratio of 1:1.1 to 1:1.3. The selection of the example ratio range in this embodiment is based on the following considerations: If the proportion of isooctyl alcohol is too low, the esterification reaction is incomplete, resulting in the residue of thioglycolic acid; if the proportion of isooctyl alcohol is too high, although it is beneficial to shift the reaction equilibrium towards the product direction, it will increase the difficulty and cost of subsequent separation and purification.

[0071] S300. Introduce an inert gas into the synthesis space through the third inlet and heat the synthesis space to the target temperature.

[0072] This step aims to create suitable environmental conditions for the reaction. First, introduce an inert gas (usually nitrogen or argon) into the synthesis space through the third inlet of the three-necked tube to exclude oxygen in the system and prevent the oxidation of mercaptoacetic acid. The flow rate of the inert gas is controlled at 50 - 100 mL / min, and the ventilation time is not less than 15 minutes to ensure that the oxygen in the system is completely replaced.

[0073] After introducing the inert gas, start heating the synthesis space to the target temperature. Heating can be carried out using an oil bath or an electric heating mantle, and the temperature control accuracy should reach ±1°C. It should be clearly stated that in this embodiment, the target temperature is preferably 100°C - 120°C.

[0074] S400. Control the stirring mechanism to stir the synthesis space so that the mercaptoacetic acid and isooctyl alcohol undergo an esterification reaction under the action of a catalyst.

[0075] Specifically, by controlling the working mode of the stirring mechanism 200, the full mixing and efficient reaction of mercaptoacetic acid and isooctyl alcohol are achieved. According to the characteristics of the aforementioned device, stirring can be divided into two modes: coaxial stirring mode and variable-axis stirring mode.

[0076] S500. Cool and reflux through the cooling reflux device to produce isooctyl mercaptoacetate.

[0077] Specifically, the cooling reflux device mainly includes a condenser and a circulating water system, whose function is to condense the evaporated substances during the reaction and reflux them to the reaction system to prevent material loss, and at the same time help to take away the reaction heat and control the reaction temperature.

[0078] The temperature of the cooling water is controlled at 10 - 15°C, and the flow rate is 2 - 3 L / min. The cooling efficiency of the condenser directly affects the progress of the reaction, and it should be ensured that the condenser works properly without any cooling water leakage. During the entire reaction process, the reflux situation of the condenser should be observed, and under normal circumstances, a uniform droplet reflux phenomenon should be observable.

[0079] After the reaction is completed, stop heating and stirring, but continue to introduce the inert gas and keep the cooling water circulating to allow the reaction system to cool naturally to room temperature. The cooling process takes about 1 - 2 hours, and the cooling rate should not be too fast to avoid affecting the product quality.

[0080] The above are only exemplary embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A device for preparing isooctyl thioglycolate, characterized in that: include: A synthesis tank, wherein a synthesis space for synthesizing the isooctyl thioglycolate is formed in the synthesis tank, and a feed port, a mounting hole and a discharge port are formed on the synthesis tank, which are distributed at intervals and are all connected to the synthesis space; and, A stirring mechanism, wherein the stirring mechanism is arranged in the synthesis space, and the stirring mechanism comprises a first stirring component, a second stirring component and a sliding component, wherein the two ends of the first stirring component are respectively a driving end and a rotating end, wherein the driving end can rotatably pass through the mounting hole and extend out of the synthesis space, wherein the driving end is transmission-connected to the output shaft of the first driving member mounted on the top of the synthesis tank, wherein the rotating end is rotationally connected to the second stirring component via a cross universal joint, wherein the sliding component can be slidably mounted on the first stirring component, and the sliding component can slide along the first stirring component until it is engaged with or disengaged from the cross universal joint, so as to correspondingly make the first stirring component and the second stirring component rotate coaxially in the synthesis space or make the second stirring component and the first stirring component rotate with variable axes in the synthesis space, and synthesize the isooctyl thioacetate.

2. The preparation device of isooctyl thioglycolate according to claim 1, characterized in that, The first stirring member comprises: A first driving shaft, wherein two ends of the first driving shaft are the driving end and the rotating end respectively, a through hole is formed in the first driving shaft, a waist-shaped hole is formed on the first driving shaft, the waist-shaped hole is connected to the through hole, and the waist-shaped hole extends from the driving end to the rotating end; A first stirring assembly, the first stirring assembly being mounted on the outer periphery of the first driving shaft close to the driving end; and A driving assembly, wherein the driving assembly is installed in the through hole, and the free end of the driving assembly is arranged along the through hole toward the rotating end, at least a portion of the sliding component can be slidably extended into the waist-shaped hole and rotatably cooperated with the output shaft of the driving assembly, and the driving assembly can drive the sliding component to slide along the first driving shaft until it is engaged with or disengaged from the cross universal joint.

3. The preparation device of isooctyl thioglycolate according to claim 2, characterized in that, The drive assembly comprises: A second driving member, the second driving member is installed in the through hole, and the second driving member is arranged close to the driving end; a telescopic rod, the telescopic rod being slidably received in the through hole and being mounted on an output end of the second driving member; and, A connecting block, wherein the connecting block is connected to the telescopic rod, the connecting block is slidably matched with the inner wall of the through hole, the sliding component is connected to the connecting block, and the second driving member can drive the connecting block to slide through the telescopic rod, so that the sliding component slides along the first driving shaft until it is engaged with or disengaged from the cross universal joint.

4. The preparation device of isooctyl thioglycolate according to claim 3, characterized in that, The first stirring assembly includes a second sleeve, the second sleeve is fixed to the outer periphery of the first driving shaft, and the outer periphery of the second sleeve is provided with a plurality of first stirring blades spaced apart along the circumferential direction.

5. The device for preparing isooctyl thioglycolate according to any one of claims 1 to 4, characterized in that: The sliding component comprises: A third sleeve, the third sleeve being slidably sleeved on the outer periphery of the first drive shaft, the third sleeve protruding inwardly corresponding to the inner wall of the waist-shaped hole until being connected to the connecting block; Two first connecting rods, the two first connecting rods are installed on the outer periphery of the third sleeve opposite to each other and at intervals, and both of the two first connecting rods extend in a direction away from the driving end along an extension direction of the first driving shaft; Two U-shaped locking blocks, the two U-shaped locking blocks are respectively connected to one of the first connecting rods, and the two U-shaped locking blocks are symmetrically arranged on the outer periphery of the first driving shaft, and the two U-shaped locking blocks are both provided with a locking groove capable of engaging the cross universal joint; and, At least two limiting protrusions are provided at the notch positions of the two locking grooves, and each of the limiting protrusions can limit the second stirring member from rotating out of the locking groove from the locking groove on the corresponding side.

6. The preparation device of isooctyl thioglycolate according to claim 5, characterized in that: The outer periphery of the third sleeve is also provided with second stirring blades distributed at intervals along the circumferential direction.

7. The preparation device of isooctyl thioglycolate according to claim 6, characterized in that: The second stirring member comprises: a second drive shaft, one end of which is connected to the cross universal joint, and the other end of which extends away from the cross universal joint to form a stirring end; and a first stirring ball, the first stirring ball being mounted on the stirring end, the first stirring ball being formed with a first accommodating cavity for accommodating an external catalyst, and the first stirring ball being formed with a plurality of first holes distributed at intervals and communicating with the first accommodating cavity; The first driving member can drive the second driving shaft via the first driving shaft to drive the first stirring ball to stir the raw material solution for preparing the isooctyl thioglycolate in the synthesis space, and prepare the isooctyl thioglycolate.

8. The device for preparing isooctyl thioglycolate according to claim 7, characterized in that: The first stirring ball is also provided with a plurality of installation positions spaced apart along the circumferential direction; The second stirring member further comprises: a plurality of second connecting rods, wherein the number of the second connecting rods is the same as the number of the installation positions and they are connected one by one, and the lengths of all the second connecting rods are different; and; a plurality of second stirring balls, each of which has a second accommodating cavity formed therein, a plurality of second holes which are spaced apart and communicated with the second accommodating cavity formed on the body of each of the second stirring balls, the number of the second stirring balls being the same as that of the second connecting rod being the same and being arranged one-to-one at an end of the second connecting rod away from the corresponding mounting position; The first stirring ball can drive the corresponding second stirring ball to rotate in the synthesis space and stir the raw materials through all the second connecting rods to produce the isooctyl thioglycolate.

9. The device for preparing isooctyl thioglycolate according to claim 8, characterized in that: The second stirring component further includes a fourth sleeve mounted on the second driving shaft, the fourth sleeve and the second driving shaft are interference fit, and the fourth sleeve is provided with a plurality of third stirring blades spaced apart along the circumferential direction.

10. A method for preparing isooctyl thioglycolate, characterized in that: Using the preparation device of isooctyl thioglycolate according to any one of claims 1 to 9; The preparation process of isooctyl thioglycolate comprises the following steps: A three-port pipe is installed at the feed port; wherein the three-port pipe has a first inlet, a second inlet and a third inlet, and a cooling reflux device is installed on the first inlet; Putting thioglycolic acid and isooctyl alcohol into the synthesis space from the feed port at a molar ratio of 1:1.1 to 1:1.3 through the second inlet; introducing an inert gas into the synthesis space through the third inlet and heating the synthesis space to a target temperature; Controlling the stirring mechanism to stir the synthesis space so that the thioglycolic acid and isooctyl alcohol undergo an esterification reaction under the action of the catalyst; The isooctyl thioglycolate is prepared by cooling and reflux through the cooling and reflux equipment.

Images