A device for preparing p-tert-butyl benzyl mercaptan

Abstract

The utility model provides a kind of p-tert-butyl benzyl mercaptan preparation device, it is related to p-tert-butyl benzyl mercaptan preparation field, including reaction kettle, reaction kettle includes feed pipe and discharge pipe, cover is provided on feed pipe, valve is provided on discharge pipe, further including spiral flow guide type jacket;The temperature in the reaction kettle can be effectively regulated by the spiral flow guide type jacket cooperating with the heat conducting oil storage tank, the refrigerating unit and the screw pump, the stability is improved and it is not easy to damage, and the reaction kettle does not need to stop stirring during sampling and PH value detection process, automatic sampling can avoid the safety hazard caused by material volatilization during the opening of sampling port, and then the preparation process of p-tert-butyl benzyl mercaptan is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of preparation of p-tert-butylbenzyl mercaptan, and more specifically, to an apparatus for preparing p-tert-butylbenzyl mercaptan. Background Technology

[0002] p-tert-butylbenzyl mercaptan is an important organic synthesis intermediate with wide applications in pharmaceuticals, pesticides, fragrances, and polymer materials. In the pharmaceutical field, it serves as a key precursor in the synthesis of antibacterial drugs, introducing thiol groups through specific chemical reactions to enhance the inhibitory activity of drugs against pathogenic bacteria. In the pesticide field, it can be used to prepare highly effective and low-toxicity herbicides and insecticides, improving the targeting and environmental compatibility of pesticides. In the fragrance industry, p-tert-butylbenzyl mercaptan can be used as a flavor modifier, imparting unique aroma characteristics to food and daily chemical products.

[0003] In the traditional preparation of p-tert-butylbenzyl mercaptan, the reactor typically employs a combination of internal bottom heating and external water-cooled jacket cooling to regulate temperature. This process involves corrosive media such as liquid alkali and hydrochloric acid, requiring the bottom heating plate to be completely submerged. The sealing material is susceptible to corrosion, leading to leakage or heating failure, resulting in insufficient temperature control stability. Furthermore, current processes rely heavily on manual, staged sampling for subsequent testing of isourea salt content and pH. Sampling requires pausing reactor stirring and opening the sampling port, disrupting production continuity and increasing the risk of material volatilization. In summary, the current p-tert-butylbenzyl mercaptan preparation process has significant shortcomings in temperature control reliability and sampling operation rationality, requiring targeted improvements. Utility Model Content

[0004] The purpose of this invention is to solve the problems mentioned in the background art and to propose an apparatus for preparing p-tert-butylbenzyl mercaptan.

[0005] The technical solution adopted by this utility model to solve its technical problem is: An apparatus for preparing p-tert-butylbenzyl mercaptan includes a reaction vessel, which includes a feed pipe and a discharge pipe. The feed pipe is fitted with a cap, and the discharge pipe is fitted with a valve. The apparatus also includes a spiral flow-guiding jacket. A spiral flow guide jacket is installed on the reactor, and two liquid inlet pipes and two liquid outlet pipes are symmetrically arranged on the spiral flow guide jacket. The two liquid inlet pipes are respectively connected to the first screw pump and the second screw pump. The first screw pump is connected to the heat transfer oil storage tank, and the second screw pump is connected to the refrigeration unit. The two liquid outlet pipes are respectively connected to the heat transfer oil storage tank and the refrigeration unit. The stirring assembly is installed inside the reactor; Both sets of titration components are set on the reactor and distributed in a front-to-back manner. One set of titration components is connected to the liquid alkali tank and the other set of titration components is connected to the hydrochloric acid tank. A temperature sensor and a first annular shell and a second annular shell, which are respectively connected to the two sets of titration components, are fixed at the top inside the reactor. The diameter of the second annular shell is smaller than that of the first annular shell. Several titration holes are circumferentially formed on the first and second annular shells, with the central hole of the second annular shell and the stirring assembly being spaced apart; The sampling tube is fixed on the reactor, and the lower end of the sampling tube is equipped with a filter head inside the reactor. The upper end of the sampling tube passes through the reactor and is connected to the diaphragm pump, which is connected to the near-infrared spectrometer. The telescopic cylinder is fixed on the reactor and is connected to a pH value detection device; The pressure relief pipe is connected to the reactor, and an automatic pressure relief valve is installed on the pressure relief pipe.

[0006] Furthermore, the stirring assembly includes a drive motor, a rotating shaft, a stirring rod, and a multi-lobed stirrer. The drive motor is fixed on the reactor and is connected to a rotating shaft located inside the reactor. Several stirring rods are symmetrically arranged in the upper part of the rotating shaft; The multi-lobed agitator, shaped like a lantern, is located in the lower part of the rotating shaft.

[0007] Furthermore, an auxiliary stirring roller is inclinedly welded onto the bottommost stirring rod.

[0008] Furthermore, the titration assembly includes an acid and alkali resistant self-priming pump, a mounting box, a pulse damper, and a delivery pipe. Two acid and alkali resistant self-priming pumps are fixed on the reactor, and the input ends of the two acid and alkali resistant self-priming pumps are respectively connected to the liquid alkali tank and the hydrochloric acid tank. Both mounting boxes are equipped with pulse dampers. The inflow pipe of the pulse damper is connected to the output end of the acid and alkali resistant self-priming pump, and the outflow pipe of the pulse damper is connected to the delivery pipe. The two delivery pipes are respectively connected to the first annular shell and the second annular shell.

[0009] Compared with the prior art, the beneficial effects of this utility model are: This application utilizes a spiral flow-guiding jacket in conjunction with a heat transfer oil storage tank, a refrigeration unit, and a screw pump to effectively regulate the temperature inside the reactor, improving stability and reducing the risk of damage. Furthermore, the reactor does not need to be stopped for sampling and pH testing, and the automatic sampling process avoids the safety hazard of material volatilization during the opening of the sampling port, thus effectively improving the preparation process of p-tert-butylbenzyl mercaptan. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the positions of the first and second annular shells; Figure label: 1. Reactor; 101. Feed pipe; 102. Discharge pipe; 103. Cover; 104. Valve; 2. Spiral guide jacket; 201. Liquid inlet pipe; 202. Liquid outlet pipe; 3. Stirring assembly; 31. Drive motor; 32. Rotary shaft; 33. Stirring rod; 34. Multi-lobed stirrer; 35. Auxiliary stirring roller; 4. Titration assembly; 41. Acid and alkali resistant self-priming pump; 42. Mounting box; 43. Delivery pipe; 5. Temperature sensor; 6. First annular shell; 7. Second annular shell; 8. Titration orifice; 9. Sampling tube; 10. Filter head; 11. Diaphragm pump; 12. Telescopic cylinder; 13. pH value detection element; 14. Pressure relief pipe; 15. Automatic pressure relief valve. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. The present utility model will be further described with reference to the accompanying drawings and embodiments: like Figure 1 and Figure 2 As shown, a p-tert-butylbenzyl mercaptan preparation apparatus includes a reactor 1, which includes a feed pipe 101 and a discharge pipe 102. The feed pipe 101 is provided with a cover 103, and the discharge pipe 102 is provided with a valve 104. It also includes a spiral flow guide jacket 2 (using existing technology without modification, and its internal structure is not shown in the figure). Structural composition and assembly relationship of spiral flow guide jacket 1. Jacket body: As the outer shell of the spiral flow guide jacket, it is fitted around the outer periphery of the reactor 1 to provide a closed space for the internal spiral flow guide channel. The material is 316L stainless steel to adapt to corrosive working conditions.

[0012] 2. Spiral guide plate: The core heat transfer component, located inside the jacket cylinder. Its inner side is welded and fixed to the outer wall of reactor 1, and its outer side is tightly fitted to the inner wall of the wrapping cylinder. The spiral angle is set to 15°-20°, and the thickness of the guide plate is 8-12mm, to ensure enhanced heat transfer when the fluid flows along the spiral channel.

[0013] 3. Wrapping cylinder: It is sleeved on the outer periphery of the spiral guide plate, and together with the outer side of the spiral guide plate and the outer wall of the reactor 1, it forms a continuous spiral channel. The material is the same as the jacket cylinder body, and it is fixed to the end ring plate by bolts.

[0014] 4. End ring plates: They are welded to both ends of the jacket cylinder, with the inner side sealed to the outer wall of reactor 1 and the outer side fully welded to the end face of the jacket cylinder to form a complete and sealed heat transfer space, while also serving as a support and fixation function.

[0015] A spiral flow guide jacket 2 is fixedly fitted in the middle area of ​​the reactor 1. Two inlet pipes 201 and two outlet pipes 202 are symmetrically arranged on the spiral flow guide jacket 2. The two inlet pipes 201 are connected to a first screw pump and a second screw pump respectively via flanges. The first screw pump is connected to a heat transfer oil storage tank via a pipeline, and the second screw pump is connected to a refrigeration unit via a pipeline. The two outlet pipes 202 are connected to the heat transfer oil storage tank and the refrigeration unit respectively via return pipelines (the first screw pump, second screw pump, heat transfer oil storage tank, and refrigeration unit are not shown in the figure). The rated flow rate of the first screw pump is 15-25 m³ / h, and the working pressure is 0.3-0.5 MPa. The rated flow rate of the second screw pump is 10-20 m³ / h, and the working pressure is 0.2-0.4 MPa, ensuring stable delivery of the heat transfer medium. The stirring assembly 3 is installed inside the reaction vessel 1, and specifically includes a drive motor 31, a rotating shaft 32, a stirring rod 33, a multi-lobed stirrer 34, and an auxiliary stirring roller 35. The drive motor 31 is fixed to the center of the top of the reactor 1 by the motor mount bolts. The drive motor 31 is a variable frequency speed control motor with a rated power of 5.5-7.5kW and a speed range of 50-300r / min. Its output shaft is coaxially connected to the rotating shaft 32 inside the reactor 1 through a coupling. The rotating shaft 32 is made of 316L stainless steel, with a diameter of 50-60mm and a length adapted to the height of the inner cavity of the reactor 1. Four to six stirring rods 33 are symmetrically welded to its upper part. The main body of the multi-lobed agitator 34, which is lantern-shaped, is welded to the lower part of the rotating shaft 32. The agitator has 6-8 lobes and the lobes are 10-15mm thick to ensure that the material at the bottom is fully mixed. To further improve the mixing effect, 2-4 auxiliary stirring rollers 35 are welded at an angle to the stirring rod 33 at the bottom. The angle between the auxiliary stirring rollers 35 and the stirring rod 33 is 30°-45°, so as to achieve multi-directional stirring. Both sets of titration components 4 are located at the top of the reactor 1 and are symmetrically distributed front and back. One set of titration components 4 is connected to the liquid alkali tank, and the other set of titration components 4 is connected to the hydrochloric acid tank. The titration components specifically include an acid and alkali resistant self-priming pump 41, a mounting box 42, a pulse damper, and a delivery pipe 43. Two acid and alkali resistant self-priming pumps 41 are fixed to the top of the reactor 1 by a bracket. They are made of fluoroplastic pump heads, with a rated flow rate of 5-10 L / h and a working pressure of 0.1-0.2 MPa. Their input ends are connected to the liquid alkali tank and the hydrochloric acid tank respectively through acid and alkali resistant hoses.

[0016] Two mounting boxes 42 are fixed to the top of the reactor 1 with bolts. Pulse dampers (not shown in the figure) are fixedly installed inside each box. The inflow pipe of the pulse damper is connected to the output end of the acid and alkali resistant self-priming pump 41 through a clamp joint. The outflow pipe is connected to the delivery pipe 43 through a clamp joint. The two delivery pipes 43 are connected to the first annular shell 6 and the second annular shell 7 through flanges, respectively.

[0017] A temperature sensor 5, a first annular shell 6, and a second annular shell 7 are fixedly mounted on the top of the reactor 1 via a bracket. The temperature sensor 5 is a PT100 platinum resistance sensor with a measurement range of 0-150℃ and an accuracy of ±0.5℃, and communicates with the PLC controller in real time. Both the first annular shell 6 and the second annular shell 7 are made of 316L stainless steel. The diameter of the second annular shell 7 is smaller than that of the first annular shell 6. The two are coaxially arranged and maintain a distance from the rotating shaft 32 to avoid obstructing the entry of the bottom material. The lower surface of both the first annular shell 6 and the second annular shell 7 is evenly provided with several titration holes 8. The diameter of the titration holes 8 is 2-3mm, and the spacing between the holes is 20-30mm to ensure uniform distribution of the titrant. Structure and parameters of pulse damper The specific structural components and assembly relationships of the pulse damper are as follows: 1. The shell is divided into upper and lower parts, which are welded from 316L stainless steel and have a volume of 0.5-1L. The upper and lower shells are connected by flange bolts and fluororubber gaskets are installed at the connection. 2. The diaphragm is located between the upper and lower shells and is made of a composite material of polytetrafluoroethylene and fluororubber (rubber-lined PTFE structure) with a thickness of 3-5mm. The edges are pressed and fixed by the flanges of the upper and lower shells to completely isolate the gas chamber from the liquid path. 3. The inflation valve is installed at the top of the housing and adopts a needle valve structure. It is used to fill the gas chamber with nitrogen (inert gas). The inflation pressure is set to 0.05-0.1MPa to match the titrant delivery pressure. 4. The shock-resistant pressure gauge is installed at the top of the housing, with a range of 0-0.2MPa and an accuracy of ±0.01MPa, and displays the air chamber pressure in real time; 5. The end cap is fixed to the top of the housing with bolts, which protects the inflation valve and pressure gauge and facilitates maintenance and operation; 6. The inlet and outlet joints are located on the lower part of both sides of the shell, and adopt clamp-type interfaces to be compatible with the acid and alkali resistant hoses of the conveying pipeline to ensure reliable sealing; Its working principle is as follows: by absorbing the peak pressure of the pulse and replenishing the trough pressure through the compression / expansion of the internal diaphragm, the pulse delivery of the titrant is transformed into a stable output, with a stable flow fluctuation range within ±5%.

[0018] The sampling tube 9 is fixed to the lower part of the inner side wall of the reactor 1 via a flange. It is made of 316L stainless steel with an inner diameter of 15-20mm. A filter head 10 is welded to its lower end. The filter head 10 is located in the lower part of the reactor 1 and uses a titanium alloy filter element with a filtration accuracy of 5-10μm, effectively removing solid impurities from the material. The upper end of the sampling tube 9 passes through the top of the reactor 1 and is connected to the diaphragm pump 11 (the diaphragm pump 11 is existing technology and will not be improved). The diaphragm pump 11 is a pneumatic diaphragm pump with a rated flow rate of 1-3L / min and a working pressure of 0.2-0.3MPa. Its output end is connected to the near-infrared spectrometer (the near-infrared spectrometer is not shown in the figure and is existing technology and will not be improved).

[0019] The specific implementation method of using near-infrared spectroscopy for isourea content detection is as follows: Spectral parameter settings: The measurement wavelength range of the near-infrared spectrometer is set to 1000-2500nm, the spectral resolution is 8cm⁻¹, and the number of scans is 32 to ensure the accuracy of the spectral data.

[0020] Sample collection and modeling: 30-50 standard samples with isourea content in the range of 0-2% were collected. Spectral data of each sample were acquired by a near-infrared spectrometer, and the isourea content was accurately determined by high-performance liquid chromatography (HPLC) as a reference value. The spectral data were preprocessed using chemometric software (such as OPUS) (including baseline correction, smoothing, and multivariate scattering correction). Then, a quantitative relationship model between the spectral data and the isourea content reference value was established using partial least squares (PLS). The coefficient of determination (R²) of the model was ≥0.98, and the root mean square error of cross-validation (RMSECV) was ≤0.05%.

[0021] Sample testing: After the unknown sample is sampled through the sampling tube 9 and the filter head 10, it is passed into the flow cell of the near-infrared spectrometer. The spectral data is collected and substituted into the established quantitative model. The isourea content detection result can be output within 1-3 minutes, with a detection accuracy of ±0.02%.

[0022] The telescopic cylinder 12 is fixed to the top of the reactor 1 by a mounting bracket. It is a pneumatic telescopic cylinder with a stroke of 300-500mm and a telescopic speed of 50-100mm / s. The lower end of its piston rod is connected to a pH value detection element 13 by a thread. The pH value detection element 13 is a glass shell corrosion-resistant pH composite electrode with a measurement range of 0-14pH, an accuracy of ±0.02pH, and a response time of ≤2s to ensure real-time and accurate detection. The pressure relief pipe 14 is connected to the pressure relief port at the top of the reactor 1 via a flange. The pressure relief pipe 14 is made of 316L stainless steel with an inner diameter of 30-40mm. An automatic pressure relief valve 15 is installed on it (this is existing technology and will not be improved). The specific structure and parameters are as follows: 1. The valve body is made of cast steel with a nominal diameter of 30-40mm and a nominal pressure of 1.0MPa, which is suitable for the working pressure range of reactor 1.

[0023] 2. The valve seat and valve disc (valve core) are made of stainless steel. The valve disc sealing surface is overlaid with hard alloy to improve wear resistance and sealing performance. The fit clearance between the valve disc and the valve seat is ≤0.02mm.

[0024] 3. The spring is made of high-temperature resistant alloy with a stiffness of 5-10 N / mm and adjustable preload. The opening pressure of the corresponding pressure relief valve is set to 0.3-0.5 MPa to ensure timely pressure relief in case of overpressure.

[0025] 4. The adjusting bolt has a fine thread structure and an adjustment accuracy of 0.01MPa. By rotating the adjusting bolt, the spring preload can be changed to achieve precise setting of the opening pressure.

[0026] 5. The seals are made of fluororubber, which is suitable for corrosive media and operating temperature ranges, ensuring no leakage when the valve is closed.

[0027] 6. The emission outlet is connected to the factory's waste gas treatment system through pipelines to prevent material volatilization from polluting the environment.

[0028] Control logic and electrical connections It should be noted that the first screw pump, the second screw pump, the drive motor 31, the acid and alkali resistant self-priming pump 41, the temperature sensor 5, the diaphragm pump 11, the telescopic cylinder 12, and the pH value detection device 13 are all electrically connected to the PLC controller (model S7-1200 series) via wires. The PLC controller is not shown in the figure, and its control logic is as follows: Temperature control: Temperature sensor 5 collects the temperature signal inside the vessel in real time and transmits it to the PLC controller. When the temperature is lower than the set value, the PLC controller starts the corresponding screw pump to introduce heat transfer oil or chilled water. When the temperature reaches the set value, the pumping will automatically stop.

[0029] Stirring control: The PLC controller presets the stirring speed according to the reaction stage. The stirring speed is 150-200 r / min in the base material mixing stage and 100-150 r / min in the reaction stage. It can be manually adjusted through the touch screen on the PLC controller.

[0030] Titration control: The PLC controller triggers the titration component to start according to the temperature signal, and controls the titration speed (liquid alkali titration speed is 3-5L / h, hydrochloric acid titration speed is 2-4L / h) through the frequency conversion regulation of the acid and alkali resistant self-priming pump 41, and stabilizes the pressure through the pulse damper.

[0031] Sampling and testing control: After the heat preservation stage, the PLC controller automatically starts the diaphragm pump 11 to sample for 30-60 seconds, with a sampling volume of 50-100mL. After the test is completed, it automatically judges whether it is qualified. If it is qualified, it proceeds to the next process.

[0032] pH control: During the hydrochloric acid titration process, the pH value detection element 13 transmits data to the PLC controller in real time. When the pH reaches 6-7, the PLC controller immediately stops the titration component from working.

[0033] Pressure relief control: When the pressure inside reactor 1 exceeds 0.5MPa, the automatic pressure relief valve 15 mechanically opens to relieve pressure, and automatically closes when the pressure drops below 0.3MPa.

[0034] The working process of this utility model First, open the cap 103 and add the process water, thiourea, TEBA, tert-butylbenzene and other base materials to the reactor 1 in the following proportion (the specific proportion is process water: thiourea: TEBA: tert-butylbenzene = 50:10:1:20, by mass). After closing the cap 103 and ensuring a reliable seal, start the first screw pump through the PLC controller to inject heat transfer oil into the spiral guide jacket 2 for heating. At the same time, set the speed of the drive motor 31 to 150-200 r / min and start the stirring component 3 for pre-stirring.

[0035] When the temperature sensor 5 detects that the temperature inside the reactor reaches 25-35℃, the signal is fed back to the PLC controller to stop the heating. The PLC controller adjusts the stirring speed to 100-150 r / min and controls the titration component 4 connected to the liquid alkali tank to start. The acid and alkali resistant shaft self-priming pump 41 draws alkali solution at a speed of 3-5 L / h and injects it into the pulse damper. The damper's gas chamber is pre-filled with 0.05-0.1 MPa nitrogen gas. The delivery pressure is stabilized by the compression / expansion of the diaphragm, so that the alkali solution is evenly dripped into the reactor 1 through the titration holes 8 of the first annular shell 6 and the second annular shell 7.

[0036] After the alkaline solution titration is completed, the temperature is maintained at 25-35℃ for 1 hour. Then, heat transfer oil is introduced again through the first screw pump to raise the temperature to 75-85℃, and the temperature is maintained for another 5 hours (the pressure inside the vessel is maintained at 0.3-0.5MPa throughout the process through the pressure relief pipe 14 and the automatic pressure relief valve 15 to ensure safety).

[0037] After the heat preservation is completed, the PLC controller automatically starts the diaphragm pump 11 to sample 50-100mL. The material is filtered through the filter head 10 to remove impurities and then enters the near-infrared spectrometer. The isourea content is detected by the preset PLS quantitative model with a detection accuracy of ±0.02%. If the detection result is <0.5% (qualified), the PLC controller first controls the first screw pump to stop working, unloads the heat transfer oil in the spiral guide jacket 2 and cleans the pipeline, and then starts the second screw pump to introduce chilled water for cooling.

[0038] When the temperature sensor 5 shows that the temperature inside the reactor has dropped to 30-40℃, the flow of chilled water is stopped. The PLC controller starts the titration assembly 4 connected to the hydrochloric acid tank, drawing hydrochloric acid at a rate of 2-4 L / h and titrating it smoothly through the pulse damper. During the titration process, the telescopic cylinder 12 continuously drives the pH value detection element 13 to immerse in the middle area of ​​the material for real-time monitoring. When the pH reaches 6-7, the titration is stopped immediately. Then, the valve 104 of the discharge pipe 102 is opened, and the material is discharged into the collection container. After being pressurized and filtered by the transfer pump (rated flow rate of 20-30 m³ / h), it enters the stratification tank: the lower water layer is transported to the plant's environmental protection station for treatment, and the upper oil layer is subjected to vacuum distillation (distillation pressure of 532 Pa, distillation range of 90-92℃) to obtain the p-tert-butylbenzyl mercaptan intermediate, completing the preparation process.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An apparatus for preparing p-tert-butylbenzyl mercaptan, comprising a reaction vessel (1), the reaction vessel (1) including a feed pipe (101) and a discharge pipe (102), the feed pipe (101) being provided with a cap (103), and the discharge pipe (102) being provided with a valve (104), characterized in that, It also includes a spiral flow guide jacket (2). A spiral guide jacket (2) is installed on the reactor (1), and two liquid inlet pipes (201) and two liquid outlet pipes (202) are symmetrically arranged on the spiral guide jacket (2). The two liquid inlet pipes (201) are connected to the first screw pump and the second screw pump respectively. The first screw pump is connected to the heat transfer oil storage tank, and the second screw pump is connected to the refrigeration unit. The two liquid outlet pipes (202) are connected to the heat transfer oil storage tank and the refrigeration unit respectively. The stirring assembly (3) is installed inside the reactor (1); Two sets of titration components (4) are set on the reactor (1) and distributed in front and behind. One set of titration components (4) is connected to the liquid alkali tank and the other set of titration components (4) is connected to the hydrochloric acid tank. A temperature sensor (5) and a first ring shell (6) and a second ring shell (7) connected to the two sets of titration components (4) are fixed at the top inside the reactor (1). The diameter of the second ring shell (7) is smaller than the diameter of the first ring shell (6). Several titration holes (8) are circumferentially opened on the first annular shell (6) and the second annular shell (7), with the central hole of the second annular shell (7) and the stirring assembly (3) being distributed at intervals; The sampling tube (9) is fixed on the reactor (1), and the lower end of the sampling tube (9) is equipped with a filter head (10) inside the reactor (1). The upper end of the sampling tube (9) passes through the reactor (1) and is connected to the diaphragm pump (11). The diaphragm pump (11) is connected to the near-infrared spectrometer. The telescopic cylinder (12) is fixed on the reactor (1), and the telescopic cylinder (12) is connected to a pH value detection device (13). The pressure relief pipe (14) is connected to the reactor (1), and an automatic pressure relief valve (15) is installed on the pressure relief pipe (14).

2. The apparatus for preparing p-tert-butylbenzyl mercaptan according to claim 1, characterized in that, The stirring assembly (3) includes a drive motor (31), a rotating shaft (32), a stirring rod (33), and a multi-lobed stirrer (34). The drive motor (31) is fixed on the reactor (1), and the drive motor (31) is connected to a rotating shaft (32) inside the reactor (1). Several stirring rods (33) are symmetrically arranged in the upper region of the rotating shaft (32); A multi-lobed stirrer (34) with a lantern-shaped main body is located in the lower part of the rotating shaft (32).

3. The apparatus for preparing p-tert-butylbenzyl mercaptan according to claim 2, characterized in that, An auxiliary stirring roller (35) is welded at an angle to the stirring rod (33) located at the bottom.

4. The apparatus for preparing p-tert-butylbenzyl mercaptan according to claim 1, characterized in that, The titration assembly (4) includes an acid and alkali resistant self-priming pump (41), a mounting box (42), a pulse damper, and a delivery pipe (43). Two acid and alkali resistant self-priming pumps (41) are fixed on the reactor (1), and the input ends of the two acid and alkali resistant self-priming pumps (41) are respectively connected to the liquid alkali tank and the hydrochloric acid tank; Both mounting boxes (42) are equipped with pulse dampers. The inflow pipe of the pulse damper is connected to the output end of the acid and alkali resistant self-priming pump (41), and the outflow pipe of the pulse damper is connected to the delivery pipe (43). The two delivery pipes (43) are respectively connected to the first annular shell (6) and the second annular shell (7).

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