P and Mo modified Y type molecular sieve catalyst and preparation method of tert-dodecyl mercaptan

Abstract

The invention provides a P and Mo modified Y type molecular sieve catalyst and a preparation method of tert-dodecyl mercaptan. The method comprises the following steps: performing P salt preliminary modification on a Y-type molecular sieve by adopting a water bath heating method to reduce strong acid central sites of the molecular sieve and increase the number of B acids, and the B acid sites can effectively adsorb S elements and enhance the activity of the molecular sieve to obtain a P-modified precursor; active metal molybdenum is deposited on the P-modified molecular sieve precursor through an electro-deposition method, Mo modification can perform dealumination on a molecular sieve framework, the Si / Al ratio is increased, the total acid density is reduced, and the desorption capacity of a product is improved; pulse electrodeposition is combined with a complexing agent to regulate and control nucleation and growth of molybdenum, deposited molybdenum salt is combined with the carrier on the surface of the molecular sieve in a high-dispersion single crystal or small cluster form, combination of metal and the carrier is enhanced, and the catalyst has good catalytic performance when applied to hydrogen sulfide addition reaction. The catalyst prepared by the method provided by the invention is suitable for synthesis of tert-dodecyl mercaptan by addition of hydrogen sulfide to tetra-polypropylene, and the product is high in yield and good in stability.

Description

Technical Field

[0001] The present invention relates to a preparation method and application of a catalyst for synthesizing tert-dodecyl mercaptan by adding hydrogen sulfide to tetrapolypropylene, and belongs to the field of preparation of fine chemicals. Background Art

[0002] Tert-dodecyl mercaptan (abbreviated as TDM) is an important organic compound and has wide applications in the synthetic materials industry. It can be used as a molecular weight regulator for products such as ABS resin, styrene-butadiene rubber (SBR), and high-impact polystyrene (M-HIPS), improving the performance and quality of the products. In addition, tert-dodecyl mercaptan can also be used as a stabilizer and antioxidant for polyolefins such as polyvinyl chloride and polyethylene, and as a raw material for synthesizing certain drugs, pesticides, fungicides, and fragrances. However, the traditional method of synthesizing tert-dodecyl mercaptan using Friedel-Crafts catalysts has a high product yield but also has many disadvantages, such as strong corrosiveness of AlCl3, toxicity of BF3, large catalyst consumption, and troublesome product separation. Especially in the synthesis of mercaptans, which are malodorous and highly volatile chemical products, its disadvantages are obvious, so it is difficult to be industrially applied. Cation exchange resins are a type of polymer material with ion exchange functions. They have better stability compared to liquid acid catalysts, the products are easy to separate, and they do not pollute the environment. They show unique high activity and high selectivity in acid-catalyzed reactions. Especially in the application of catalyzing the addition of tetrapolypropylene and hydrogen sulfide to synthesize TDM under low temperature and low pressure, they have very good stability and product selectivity. However, the characteristics of easy decomposition of this catalyst under heat and extreme sensitivity to moisture seriously restrict its application. Therefore, it is of great significance to develop new synthesis methods to improve the yield and quality of tert-dodecyl mercaptan.

[0003] As a new type of chemical material, molecular sieves have unique advantages in adsorption and chemical catalysis due to their high specific surface area, uniform pore size distribution, adjustable acidity, and unique structure. In recent years, they have been widely studied and applied. For silica-alumina molecular sieves, the commonly used regulation method is to reversibly exchange some cations with the protons on the bridging hydroxyl groups of the molecular sieves to regulate the adsorption performance of the molecular sieves, and to regulate their acid strength by regulating the silica-alumina ratio of the molecular sieves. The American company Pennwalt once reported that sodium oxide-modified Y-type molecular sieves can achieve a high yield of the product TDM at a relatively low space velocity. It can be seen that for the addition reaction of olefins and hydrogen sulfide, molecular sieves are also a type of catalyst with high catalytic activity. However, for Y-type molecular sieves, when catalyzing the addition of dodecene and hydrogen sulfide to synthesize mercaptan, the catalyst is easily deactivated by carbon deposition. Therefore, it is of great significance to explore a method for modifying Y-type molecular sieves to extend the life of the molecular sieves. Summary of the Invention

[0004] The present invention provides a preparation method and application of a catalyst for synthesizing tert-dodecyl mercaptan by adding hydrogen sulfide to tetrapolypropylene. The present invention adopts a two-step method: first, the Y-type molecular sieve is preliminarily modified with P salt by water bath heating to reduce the strong acid center sites of the molecular sieve and increase the number of B acids. The B acid sites can effectively adsorb S elements and enhance the activity of the molecular sieve to obtain a P-modified precursor; then, the active metal molybdenum is deposited on the P-modified molecular sieve precursor by electrodeposition. Mo modification can remove aluminum from the molecular sieve framework, increase the Si / Al ratio, decrease the total acid density, improve the desorption ability of the product, and reduce coke; pulse electrodeposition combined with a complexing agent is used to control the nucleation and growth of molybdenum. The deposited molybdenum salt is combined with the carrier in the form of highly dispersed single crystals or small clusters on the surface of the molecular sieve, strengthening the combination of the metal and the carrier, and having good catalytic performance and good stability in the hydrogen sulfide addition reaction. Finally, the molecular sieve treated with P and Mo is calcined in air to obtain the required catalyst P x -Mo y -Y. The catalyst is suitable for synthesizing mercaptan compounds by adding hydrogen sulfide to tetrapolypropylene, has a high conversion rate, a high product selectivity, good stability, and is suitable for industrial production.

[0005] To achieve the above invention object, the present invention provides the following specific technical solutions: A preparation method and application of a tert-dodecyl mercaptan catalyst, which is prepared by a two-step method, and the specific steps are as follows: (1) Add the Y-type molecular sieve to a phosphorus-containing solution, heat it in a water bath, stir, filter, wash, and dry to obtain a P-modified Y-type molecular sieve precursor; (2) Pretreat the precursor in (1) and then perform electrodeposition to load Mo in an electrolyte solution containing Mo ions; (3) After deposition, wash and dry, and finally calcine at a high temperature in an air atmosphere to obtain an xP-yMo-Y catalyst.

[0006] In the present invention, in step (1), the Y-type molecular sieve used in the experiment is any one of NaY, HY, USY, and ReY.

[0007] In the present invention, in step (1), the phosphorus source of the phosphorus-containing solution is any one of phosphoric acid, potassium dihydrogen phosphate, disodium hydrogen phosphate, and diammonium hydrogen phosphate, wherein the solution concentration is 0.2 M - 0.8 M.

[0008] In the present invention, in step (1), the water bath heating temperature is 40 - 100 °C, the water bath time is 2 - 8 h, and the drying temperature is 100 °C.

[0009] In the present invention, in step (2), due to the insulating property of the molecular sieve itself, the precursor needs to be immersed in a conductive polymer solution to form a conductive layer on its surface. The conductive polymer used is any one of polypyrrole and polyaniline, and the immersion time is 1 - 4 h.

[0010] In the present invention, in step (2), the Mo metal salt is one of ammonium paramolybdate, sodium molybdate, molybdenum trichloride, and molybdenum hydroxide, wherein the loading amount of the molybdenum oxide is 1 wt% - 5 wt%.

[0011] In the present invention, in step (2), a complexing agent is also required to assist the deposition during the electrodeposition process, and the complexing agent is one of citric acid, diethylenetriaminepentaacetic acid (EDTA), and ammonia water.

[0012] In the present invention, in step (2), the deposition time is 10 - 60 min, preferably 40 min; the electrolyte temperature is 20 - 80 °C, preferably 60 °C, and the stirring rate is 200 - 800 rpm, preferably 500 rpm.

[0013] In the present invention, in step (3), the drying temperature is 80 - 120 °C, the high-temperature calcination temperature is 400 - 600 °C, and the calcination time is 2 - 8 h.

[0014] The catalyst prepared by the foregoing preparation method is applied to the reaction of olefin addition with hydrogen sulfide to produce mercaptan. The reactor can be either a reaction kettle or a fixed bed. The general steps are as follows: Add the tetrapolypropylene solution and the catalyst into the reactor. At a certain reaction temperature and pressure, the raw material liquid and hydrogen sulfide react under the catalysis of the catalyst to produce tert-dodecyl mercaptan.

[0015] Preferably, the reaction conditions are: the reaction temperature is 60 - 100 °C; the reaction pressure is 0 - 5.0 MPa; the reaction volume space velocity is 0.1 - 1 h -1 ; the molar ratio of hydrogen sulfide to tetrapolypropylene is 5 - 20.

[0016] Preferably, before the reaction, the raw material tetrapolypropylene needs to be rectified and purified to increase the high-carbon components in the raw material. Preferably, the purity of the C11 - C13 fraction is ≥95%.

[0017] The beneficial effects of the present invention are as follows: (1) Modifying with P element reduces the strong acid center sites of the molecular sieve and increases the number of B acids. The B acid sites can effectively adsorb S element and enhance the activity of the molecular sieve; (2) Modifying with Mo salt for dealumination of the molecular sieve increases the Si / Al ratio, decreases the total acid density of the catalyst, improves the desorption ability of the product, reduces coke, and improves the stability of the catalyst.

[0018] (3) Compared with the traditional chemical adsorption where the distribution of metals on the carrier surface is uneven, resulting in pore blockage, the electrodeposition method can uniformly load Mo, strengthen the connection between the metal and the carrier, and improve the performance of the catalyst. Detailed implementation manners

[0019] The advantages of the present invention will be further described in detail below in conjunction with examples and comparative examples. It should also be understood that the following examples are only used to further illustrate the present invention and should not be construed as limiting the protection scope of the present invention. The specific quality, reaction time, temperature, process parameters, etc. in the examples are also only examples within a suitable range. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention all fall within the protection scope of the present invention.

[0020] Unless otherwise specified, the raw materials in the following examples and comparative examples are all rectified tetrapolypropylene solutions, and the reagents are all obtained through commercial channels.

[0021] Example 1 Catalyst preparation: Prepare a 0.2 M ammonium hydrogen phosphate solution of 100 ml. After heating in a water bath at 60 °C, add 20 g of Y-type molecular sieve, and then stir in the water bath for 4 h. The modified precursor is washed with deionized water until neutral and dried for the next step; the precursor is immersed in a polypyrrole conductive polymer solution for 2 h to make its surface conductive. After pretreatment, the precursor is placed in an electrolytic cell as a working electrode. 0.005 mol of ammonium molybdate is dissolved in an electrolytic cell with citric acid as a complexing agent for electrodeposition. Turn on the pulsed current, control the deposition temperature at 60 °C, and perform electrodeposition at 500 rpm for 40 min; after electrodeposition, wash and dry, and finally calcine the catalyst in an air atmosphere at a heating rate of 5 °C / min to 500 °C for 3 h to obtain the catalyst 0.2P-5Mo-Y.

[0022] Catalyst performance evaluation: Weigh 300 g of tetrapolypropylene solution and 15 g of 0.2P-5Mo-Y catalyst and add them to a high-pressure reactor. Seal the reactor, replace it with hydrogen sulfide at 1 MPa for 3 times, and then increase the pressure to 2.0 MPa. Open the hydrogen sulfide gas cylinder to keep the pressure in the reactor constant. Heat up. After the temperature in the reactor rises to 60 °C and stabilizes, turn on the magnetic stirrer and start the reaction timing. After reacting for 4 h, cool to room temperature, relieve the pressure, and analyze the resulting tert-dodecyl mercaptan product by gas chromatography. The results are shown in Table 1.

[0023] Example 2 Catalyst Preparation: Prepare 100 ml of 0.3 M phosphoric acid solution. After heating in a water bath at 60 °C, add 20 g of Y-type molecular sieve. Then, stir in the water bath for 4 h. Wash the modified precursor with deionized water until neutral, and dry it for the next step. Immerse the precursor in a polyaniline conductive polymer solution for 2 h to make its surface conductive. After pretreatment, place the precursor in an electrolytic cell as the working electrode. Dissolve 0.005 mol of ammonium molybdate in an electrolytic cell with ammonia water added as a complexing agent for electrodeposition. Turn on the pulsed current, control the deposition temperature at 60 °C, and perform electrodeposition at 500 rpm for 40 min. After electrodeposition, wash and dry. Finally, calcine the catalyst in an air atmosphere at a heating rate of 5 °C / min to 500 °C for 3 h to obtain the catalyst 0.3P-5Mo-Y.

[0024] Catalyst Performance Evaluation: Take 20 ml of the 0.3P-5Mo-Y catalyst and carry out the performance evaluation of the addition reaction of hydrogen sulfide using tetrapolypropylene as the raw material in a fixed-bed reactor. Under the conditions of a reaction temperature of 40 °C, a reaction pressure of 1 MPa, and a mass space velocity set at 0.6 h -1 , and a molar ratio of hydrogen sulfide to tetrapolypropylene set at 6, carry out the addition reaction to obtain a reaction solution of tert-dodecyl mercaptan, and analyze it by gas chromatography. The results are shown in Table 1.

[0025] Example 3 Catalyst Preparation: Prepare 100 ml of 0.5 M disodium hydrogen phosphate solution. After heating in a water bath at 60 °C, add 20 g of Y-type molecular sieve. Then, stir in the water bath for 4 h. Wash the modified precursor with deionized water until neutral, and dry it for the next step. Immerse the precursor in a polypyrrole conductive polymer solution for 2 h to make its surface conductive. After pretreatment, place the precursor in an electrolytic cell as the working electrode. Dissolve 0.005 mol of sodium molybdate in an electrolytic cell with EDTA added as a complexing agent for electrodeposition. Turn on the pulsed current, control the deposition temperature at 60 °C, and perform electrodeposition at 500 rpm for 40 min. After electrodeposition, wash and dry. Finally, calcine the catalyst in an air atmosphere at a heating rate of 5 °C / min to 500 °C for 3 h to obtain the catalyst 0.5P-5Mo-Y.

[0026] Catalyst Performance Evaluation: Take 20 ml of the 0.5P-5Mo-Y catalyst and carry out the performance evaluation of the addition reaction of hydrogen sulfide using tetrapolypropylene as the raw material in a fixed-bed reactor. Under the conditions of a reaction temperature of 60 °C, a reaction pressure of 1.5 MPa, and a mass space velocity set at 0.4 h -1 , and a molar ratio of hydrogen sulfide to tetrapolypropylene set at 15, carry out the addition reaction to obtain a reaction solution of tert-dodecyl mercaptan, and analyze it by gas chromatography. The results are shown in Table 1.

[0027] Example 4: Catalyst preparation: Prepare 100 ml of 0.3 M phosphoric acid solution. After heating in a water bath at 60 °C, add 20 g of Y-type molecular sieve. Then, stir in the water bath for 4 h. Wash the modified precursor with deionized water until the molecular sieve is neutral, and dry it for the next step. Immerse the precursor in a polyaniline conductive polymer solution for 2 h to make its surface conductive. After pretreatment, place the precursor in an electrolytic cell as the working electrode. Dissolve 0.005 mol of ammonium molybdate in an electrolytic cell with ammonia water added as a complexing agent for electrodeposition. Turn on the pulsed current, control the deposition temperature at 60 °C, and perform electrodeposition at 500 rpm for 20 min. After electrodeposition, wash and dry. Finally, calcine the catalyst in an air atmosphere at a heating rate of 5 °C / min to 500 °C for 3 h to obtain catalyst 0.3P-5Mo-Y-2.

[0028] Catalyst performance evaluation: Take 20 ml of 0.3P-5Mo-Y-2 catalyst and carry out the performance evaluation of the addition reaction of hydrogen sulfide with tetrapropylene as the raw material in a fixed-bed reactor. Under the conditions of a reaction temperature of 50 °C, a reaction pressure of 2 MPa, and a mass space velocity set at 0.2 h -1 , and an addition reaction is carried out under the condition that the molar ratio of hydrogen sulfide to tetrapropylene is set to 10 to obtain a reaction solution of tert-dodecyl mercaptan, which is analyzed by gas chromatography. The results are shown in Table 1.

[0029] Example 5: Catalyst preparation: Prepare 100 ml of 0.3 M phosphoric acid solution. After heating in a water bath at 60 °C, add 20 g of Y-type molecular sieve. Then, stir in the water bath for 4 h. Wash the modified precursor with deionized water until the molecular sieve is neutral, and dry it for the next step. Immerse the precursor in a polyaniline conductive polymer solution for 2 h to make its surface conductive. After pretreatment, place the precursor in an electrolytic cell as the working electrode. Dissolve 0.005 mol of ammonium molybdate in an electrolytic cell with ammonia water added as a complexing agent for electrodeposition. Turn on the pulsed current, control the deposition temperature at 60 °C, and perform electrodeposition at 500 rpm for 60 min. After electrodeposition, wash and dry. Finally, calcine the catalyst in an air atmosphere at a heating rate of 5 °C / min to 500 °C for 3 h to obtain catalyst 0.3P-5Mo-Y-3.

[0030] Catalyst performance evaluation: Take 20 ml of 0.3P-5Mo-Y-3 catalyst and carry out the performance evaluation of the addition reaction of hydrogen sulfide with tetrapropylene as the raw material in a fixed-bed reactor. Under the conditions of a reaction temperature of 50 °C, a reaction pressure of 2 MPa, and a mass space velocity set at 0.2 h -1 , and an addition reaction is carried out under the condition that the molar ratio of hydrogen sulfide to tetrapropylene is set to 10 to obtain a reaction solution of tert-dodecyl mercaptan, which is analyzed by gas chromatography. The results are shown in Table 1.

[0031] Example 6: Catalyst preparation: Prepare 100 ml of 0.5 M phosphoric acid solution. After heating in a water bath at 60 °C, add 20 g of Y-type molecular sieve. Then, stir in the water bath for 4 h. Wash the modified precursor with deionized water until neutral, and dry it for the next step. Immerse the precursor in a polypyrrole conductive polymer solution for 2 h to make its surface conductive. After pretreatment, place the precursor in an electrolytic cell as the working electrode. Dissolve 0.006 mol of molybdenum hydroxide in an electrolytic cell with citric acid as a complexing agent for electrodeposition. Turn on the pulsed current, control the deposition temperature at 60 °C, and perform electrodeposition at 500 rpm for 40 min. After electrodeposition, wash and dry. Finally, calcine the catalyst in an air atmosphere at a heating rate of 5 °C / min to 500 °C for 3 h to obtain the catalyst 0.5P-6Mo-Y.

[0032] Catalyst performance evaluation: Weigh 300 g of tetrapropylene solution and 15 g of 0.5P-6Mo-Y catalyst and add them to a high-pressure reaction kettle. Seal the kettle, replace the air with hydrogen sulfide at 1 MPa for 3 times, and then increase the pressure to 2.0 MPa. Open the hydrogen sulfide gas cylinder to keep the pressure in the reaction kettle constant. Heat up. When the temperature in the reaction kettle reaches 60 °C and stabilizes, turn on the magnetic stirrer and start the reaction timing. After reacting for 4 h, cool to room temperature, release the pressure, and analyze the resulting tert-dodecyl mercaptan product by gas chromatography. The results are shown in Table 1.

[0033] Comparative Example 1 Catalyst preparation: Do not perform any modification on the Y-type molecular sieve.

[0034] Catalyst performance evaluation is the same as that in Example 1, and the results are shown in Table 1.

[0035] Comparative Example 2 Catalyst preparation: The catalyst preparation is similar to that in Example 2, except that the catalyst is not modified with Mo element, denoted as 0.3P-Y.

[0036] Catalyst performance evaluation is the same as that in Example 2, and the results are shown in Table 1.

[0037] Comparative Example 3 Catalyst preparation: The catalyst preparation is similar to that in Example 3, except that the catalyst is not modified with Mo salt, denoted as 5Mo-Y.

[0038] Catalyst performance evaluation is the same as that in Example 3, and the results are shown in Table 1.

[0039] Comparative Example 4 Catalyst preparation: The catalyst preparation is similar to that in Example 6, except that the Y-type molecular sieve is not subjected to conductive treatment.

[0040] The evaluation of the catalyst performance was consistent with Example 6, and the results are shown in Table 1. From the comparison of the results of Example 1 and Comparative Example 1, it can be seen that the activity of the Y-type zeolite without P and Mo modification at all is lower than that of the modified zeolite. From the comparison of the results of Examples 2-4 and Comparative Examples 2-3, it can be seen that the modification with P or Mo alone can improve the activity of the catalyst, but the activity is worse than that of the combination of the two. From the comparison of the results of Example 6 and Comparative Example 4, it can be seen that without the conductive pretreatment on the surface of the Y-type zeolite, the electrodeposition effect of metal Mo is weak, showing poor catalytic performance of the catalyst.

[0041] Table 1. Experimental results of each example and comparative example

[0042] Stability experiment of 0.3P-5Mo-Y catalyst in Example 2: Weigh 300 g of tetrapolypropylene solution and 15 g of 0.3P-5Mo-Y catalyst and add them to a high-pressure reactor. Seal the reactor, fill it with hydrogen sulfide, displace it 3 times at 1 MPa, and then increase the pressure to 2.0 MPa. Open the hydrogen sulfide gas cylinder to keep the pressure in the reactor constant. Heat up. After the temperature in the reactor rises to 60 °C and stabilizes, turn on the magnetic stirrer and start the reaction timing. After reacting for 4 h, cool it to room temperature, relieve the pressure, analyze the reaction product obtained by gas chromatography, recycle the catalyst, dry it, and then repeat the above steps. The conversion rate / selectivity of each use time is shown in Table 2: Table 2. Experimental results of the recycling of 0.3P-5Mo-Y catalyst

[0043] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the method of the present invention, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present invention.

Claims

1. A P, Mo modified Y zeolite catalyst, the active components of the catalyst are the main active components P and Mo, and the carrier is Y zeolite, characterized in that, The acidic strength of Y-type zeolite was adjusted by P element modification, and highly dispersed Mo single crystals or small clusters were deposited on the zeolite surface by electrodeposition method, which strengthened the combination of metal and support, and a catalyst xP-yMo-Y with excellent catalytic performance was obtained.

2. The P, Mo modified Y zeolite catalyst according to claim 1, characterized in that, The carrier Y-type zeolite described above is any one of NaY, HY, USY and ReY.

3. The preparation method of the P, Mo modified Y zeolite catalyst according to claim 1 or 2, characterized in that, Its preparation method is divided into two steps, which are respectively: (1) Add Y-type zeolite into a phosphorus-containing solution, heat it in a water bath, stir, filter, wash and dry to obtain a P-modified Y-type zeolite precursor; (2) Pretreat the precursor in (1) and then carry out electrodeposition to load Mo in an electrolyte containing Mo ions; (3) After deposition, wash and dry, and finally calcine at high temperature in an air atmosphere to obtain the xP-yMo-Y catalyst.

4. The preparation method according to claim 3, characterized in that, In step (1), the phosphorus source in the phosphorus-containing solution is selected from one of phosphoric acid, potassium dihydrogen phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, dipotassium hydrogen phosphate, and diammonium hydrogen phosphate. Among them, the solution concentration is 0.2 M - 0.8 M, the water bath heating reaction temperature is 40 - 100 °C, the hydrothermal reaction time is 2 - 8 h, and the drying temperature is 100 - 120 °C.

5. The preparation method according to claim 3, wherein Immerse the precursor in a conductive polymer solution to form a conductive layer on its surface. The conductive polymer used is one of polypyrrole and polyaniline, and the immersion time is 1 - 4 h.

6. The preparation method according to claim 3, characterized in that, The metal Mo salt is one of ammonium paramolybdate, sodium molybdate, molybdenum trichloride, and molybdenum hydroxide. Among them, the loading amount of molybdenum oxide is 1wt% - 5wt%.

7. The preparation method according to claim 3, wherein A complexing agent is added during the electrodeposition process to assist deposition. The complexing agent is one of citric acid, diethylenetriaminepentaacetic acid or ammonia water; The deposition time is 10 - 60 min, preferably 40 min; the electrolyte temperature is 20 - 80 °C, preferably 60 °C, and the stirring rate is 200 - 800 rpm, preferably 500 rpm.

8. The preparation method according to claim 3, wherein The drying temperature is 80 - 120 °C, the high-temperature calcination temperature is 400 - 600 °C, and the calcination time is 2 - 8 h.

9. Application of the catalyst prepared by the preparation method according to any one of claims 1 - 8 in the preparation of tert-dodecyl mercaptan compound by the addition of hydrogen sulfide to tetrapolypropylene.

10. The application according to claim 9, wherein Preheat the mixture of tetrapropylene and hydrogen sulfide, with a reaction temperature of 30 - 140 °C, a reaction pressure of 0 - 5.0 MPa, a molar ratio of hydrogen sulfide to tetrapropylene of 5 - 20, and a volume space velocity of 0.5 - 3.0 h -1 Perform the sulfidation reaction to obtain the product tert-dodecyl mercaptan.

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