A preparation method and a preparation device for titanium silicalite molecular sieve

Abstract

The present invention discloses a preparation method and a preparation device for titanium-containing mordenite zeolite molecular sieve, which comprises the following steps: First, using industrial hydrogen-type mordenite as the matrix, performing calcination activation treatment, and then realizing framework dealumination through pickling to form dealuminated mordenite with hydroxyl nest defect sites. After that, an optimized liquid-solid phase titanation reaction system is adopted, combined with ultrasonic external field assisted oscillation technology, so that the dealuminated mordenite and the titanium source solution undergo an efficient liquid-solid phase titanation reaction at room temperature and normal pressure to obtain the titanium-containing mordenite zeolite molecular sieve. Compared with the high-temperature gas-solid phase method, the process of this liquid-solid phase method is easy to control and the energy consumption is significantly reduced; compared with the traditional liquid-solid phase method, by using a suitable titanium source and introducing an ultrasonic-assisted liquid-solid phase reaction mechanism, the mass transfer efficiency at the solid-liquid interface is effectively enhanced, and the titanation process can be completed in a relatively short time under the conditions of room temperature and normal pressure.

Description

Technical Field

[0001] The present invention relates to a preparation method and a preparation device for titanium wire mordenite zeolite molecular sieve. Background Art

[0002] Oximes, as important downstream products of ketones, are key intermediates in the field of bulk chemicals. For example, butanone oxime can replace toxic hydrazine compounds as boiler deoxidizers or anti-skinning agents; another example is cyclohexanone oxime, and caprolactam synthesized by its Beckmann rearrangement is a precursor for the production of nylon 6, and nylon 6 can be processed into polyamide fibers, plastics, etc., which are closely related to people's daily lives. The traditional process for synthesizing oximes is the non-catalytic reaction of hydroxylamine derivatives and ketones. According to different hydroxylamine synthesis routes, it can be divided into three types: hydroxylamine phosphate method, Raschig method, and nitric oxide reduction method. However, the process is cumbersome, the equipment corrosion is serious, and the by-products seriously pollute the environment. To replace the traditional hydroxylamine preparation process for oximes, the modern process for preparing oximes is to use the titanium silicalite / H2O2 system to highly selectively catalyze the ammoximation reaction of ketones, that is, H2O2 and NH3 generate NH2OH under the catalysis of the active center Ti of the titanium silicalite molecular sieve, and NH2OH further reacts with ketones to form the corresponding oximes. The ammoximation process has mild reaction conditions, the by-product is H2O, and the discharge of three wastes is small, which is of great significance for the green development of industrial oxime preparation.

[0003] Titanium wire mordenite zeolite molecular sieve (Ti-MOR), as a titanium silicalite molecular sieve widely used in the industrial field, shows good catalytic performance in the ammoximation reaction. Its preparation methods are mainly divided into the traditional hydrothermal method and the post-synthesis method. It is relatively difficult to synthesize Ti-MOR by the traditional hydrothermal method. Alkali metals in the raw materials are likely to cause the inactivation of the framework active center Ti, and it is difficult for element Ti to be highly dispersed in the system, resulting in the easy formation of TiO2 on the surface of the molecular sieve and the decline of catalytic performance. The post-synthesis method includes the gas-solid phase method and the liquid-solid phase method, both of which use the existing mordenite zeolite molecular sieve as the matrix and introduce active Ti sites by replacing part of the framework aluminum. The typical process flow of the gas-solid phase method includes: using strong acid to remove most of the aluminum in the parent molecular sieve to form hydroxyl nest defect sites, obtaining dealuminated mordenite, and then using N2 as the carrier gas to carry out a gas-solid phase reaction between TiCl4 and the defect sites at a high temperature above 600 °C to achieve the framework embedding of element Ti. At present, although the gas-solid phase method is the main way to prepare Ti-MOR, the high temperature condition in this process leads to excessive energy consumption, and TiCl4 is easy to react with water vapor in the environment to generate a large amount of HCl acid mist to corrode the equipment. In contrast, the liquid-solid phase method directly contacts the dealuminated mordenite zeolite molecular sieve with the titanium source solution at room temperature to complete the titanation reaction. This process has mild reaction conditions, low energy consumption, and easy process control, but the liquid-solid phase titanation reaction time is too long and there are few suitable titanium source solutions. Summary of the Invention

[0004] To overcome the deficiencies of the prior art, the present invention provides a method and apparatus for preparing titanium-containing mordenite zeolite molecular sieve. Using the liquid-solid phase method has the advantages of mild reaction conditions, easy process control, and low energy consumption. After dealuminating the mordenite zeolite molecular sieve, Ti-MOR is prepared by directly performing a liquid-solid phase titanation reaction between the dealuminated mordenite and a suitable ammonium fluotitanate solution. An ultrasonic field is introduced through an ultrasonic oscillator to assist in strengthening the mass transfer efficiency between the liquid and solid phases, increasing the reaction rate of the liquid-solid phase titanation reaction, and greatly shortening the reaction time.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A method for preparing titanium-containing mordenite zeolite molecular sieve, comprising the following steps:

[0006] S1. Using industrial hydrogen-form mordenite as the parent body, placing it in a muffle furnace for calcination activation treatment, with a calcination temperature of 700 degrees Celsius and a calcination time of 6 hours;

[0007] S2. Pickling and dealuminating the mordenite zeolite molecular sieve treated in S1 with a strong acid, and obtaining the dealuminated mordenite zeolite molecular sieve through filtration, washing, drying, and calcination;

[0008] S3. Dispersing the dealuminated mordenite zeolite molecular sieve prepared in S2 into an ammonium fluotitanate solution with a certain concentration, then placing the dispersion of the dealuminated mordenite zeolite molecular sieve in a polytetrafluoroethylene container, and placing the polytetrafluoroethylene container in an ultrasonic oscillator, stirring and applying ultrasound to perform a liquid-solid phase titanation reaction;

[0009] S4. Filtering the liquid-solid phase, filtering and washing the sample with hot deionized water by suction, and sequentially placing the washed sample in an oven for drying and in a muffle furnace for calcination to finally obtain the titanium-containing mordenite zeolite molecular sieve Ti-MOR.

[0010] As a preferred technical solution of the present invention, the mass of the industrial hydrogen-form mordenite zeolite raw powder in S1 is 10 - 30 grams.

[0011] As a preferred technical solution of the present invention, the solid-liquid ratio of the mordenite zeolite molecular sieve to the strong acid solution in S2 is 1g:(10 - 20) mL. The strong acid can be nitric acid, sulfuric acid, or hydrochloric acid. The concentration of the strong acid solution is 6 mol / L, at normal pressure, the pickling temperature is 120 - 150 degrees Celsius, and the pickling time is 8 - 12 hours.

[0012] As a preferred technical solution of the present invention, the temperature of the oven used in the drying process in S2 is 80 degrees Celsius, drying for 12 hours, the calcination temperature of the muffle furnace is 550 degrees Celsius, and the calcination time is 6 hours.

[0013] As a preferred technical solution of the present invention, in S3, the solid-liquid ratio of dealuminated mordenite zeolite molecular sieve to ammonium hexafluorotitanate solution is 1 g:(10 - 20) mL, the concentration of ammonium hexafluorotitanate solution is 0.1 - 0.5 mol / L, under normal pressure, the titanization temperature is 20 - 60 °C, and the titanization time is 1 - 6 hours.

[0014] As a preferred technical solution of the present invention, in S4, the temperature of hot deionized water is 40 - 80 °C, the oven temperature is 80 °C, dried for 12 hours, the calcination temperature in the muffle furnace is 550 °C, and the calcination time is 6 hours.

[0015] The titanium mordenite zeolite molecular sieve preparation device, which is applied to the titanium mordenite zeolite molecular sieve preparation method, includes a base, a lifting mechanism, a placement plate and a positioning mechanism. The ultrasonic oscillator is arranged on the base. The placement plate is arranged inside the ultrasonic oscillator. The polytetrafluoroethylene container is arranged on the placement plate through the positioning mechanism. The lifting mechanism is used to drive the placement plate to lift, so as to take out or put into the ultrasonic oscillator the polytetrafluoroethylene container.

[0016] As a preferred technical solution of the present invention, the lifting mechanism includes a support column arranged on the base. A support base is arranged on the support column. A motor is installed on the support base. The power output end of the motor is connected to a first threaded rod. A moving block is installed on the first threaded rod. The outside of the moving block is connected to a lifting frame through an adapter plate. The placement plate is installed inside the lifting frame.

[0017] As a preferred technical solution of the present invention, a slide rail is arranged outward on one side of the support column facing the support base. A slider is arranged inside the slide rail. The slider is connected to the moving block.

[0018] As a preferred technical solution of the present invention, the positioning mechanism includes a fixing plate arranged on the surface of the placement plate. A second threaded rod is horizontally inserted into the fixing plate. A limiting clamp is arranged at one end of the second threaded rod facing the polytetrafluoroethylene container. A handle is arranged at the other end of the second threaded rod away from the limiting clamp.

[0019] Compared with the prior art, the beneficial effects that the present invention can achieve are as follows: Using the liquid-solid phase method has the advantages of mild reaction conditions, better process control, and low energy consumption. After the mordenite zeolite molecular sieve is dealuminated, Ti-MOR is prepared by directly contacting the dealuminated mordenite with ammonium hexafluorotitanate solution for reaction. The ultrasonic field is introduced through the ultrasonic oscillator to assist in strengthening the mass transfer efficiency, improving the liquid-solid phase titanization reaction rate at room temperature and normal pressure, and shortening its reaction time. Description of the Drawings

[0020] Figure 1 It is the XRD spectrum of the titanium mordenite zeolite molecular sieve of Example 1 and Example 2 of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the first perspective of the whole of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the lifting frame of the present invention;

[0023] Figure 4 It is a schematic structural diagram of the limiting clip of the present invention;

[0024] Figure 5 It is a schematic structural diagram of the fixing plate of the present invention.

[0025] Wherein: 1, base; 2, placing plate; 3, ultrasonic oscillator; 4, polytetrafluoroethylene container; 5, support column; 6, support base; 7, motor; 8, first threaded rod; 9, moving block; 10, connecting plate; 11, lifting frame; 12, slide rail; 13, slider; 14, fixing plate; 15, second threaded rod; 16, limiting clip; 17, handle. Specific embodiments

[0026] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work all belong to the protection scope of the present invention. The experimental methods in the following embodiments are all conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments can all be obtained from commercial channels unless otherwise specified. Example 1:

[0027] This embodiment proposes a preparation method of titanium wire mordenite zeolite molecular sieve, including the steps:

[0028] S1. Using industrial hydrogen-type mordenite as the parent body, placing it in a muffle furnace for calcination activation treatment. The mass of mordenite is 10 grams, the calcination temperature is 700 degrees Celsius, and the calcination time is 6 hours.

[0029] S2. Mixing the mordenite zeolite molecular sieve treated in S1 with 6 mol / L nitric acid solution according to a solid-liquid ratio of 1g:10mL, refluxing and pickling for 10 hours, and obtaining dealuminated mordenite zeolite molecular sieve through filtration, washing, drying and calcination. The pickling temperature is 140 degrees Celsius, normal pressure; the drying temperature is 80 degrees Celsius, the time is 12 hours; the calcination temperature is 550 degrees Celsius, and the time is 6 hours.

[0030] S3. Disperse the dealuminated mordenite zeolite molecular sieve prepared in S2 into an ammonium hexafluorotitanate solution with a certain concentration. Then, place the above-mentioned mixed solution into the polytetrafluoroethylene container 4, and place the polytetrafluoroethylene container 4 in the ultrasonic oscillator 3. Stir the inside of the polytetrafluoroethylene container 4, turn on the ultrasonic oscillator 3, and make the ultrasonic oscillator 3 perform ultrasonic oscillation on the polytetrafluoroethylene container 4 to carry out the liquid-solid phase titanation reaction. The titanation time is 6 hours, the titanation temperature is 30 °C, and the pressure is normal pressure.

[0031] S4. Filter the liquid-solid phase, filter and wash the sample with hot deionized water by suction, and then place the washed sample in an oven for drying and calcine it in a muffle furnace to finally obtain the titanium mordenite zeolite molecular sieve Ti-MOR. The temperature of the deionized water is 60 °C; the drying temperature is 80 °C and the time is 12 hours; the calcination temperature is 550 °C and the time is 6 hours.

[0032] The ultrasonic oscillator belongs to the prior art and will not be elaborated here. By using the ultrasonic oscillator, the dealuminated mordenite zeolite molecular sieve and the titanium source solution are increased in diffusion contact reaction, the titanium supplement process is accelerated, and the time for preparing Ti-MOR by the liquid-solid phase method is shortened.

[0033] As shown in Figure 1 the XRD spectrum attached, the above-mentioned titanium mordenite zeolite molecular sieve prepared by the liquid-solid phase titanation reaction shows typical diffraction peaks of the MOR topological structure at 2 θ = 9.78, 13.59°, 19.70°, 22.45°, 25.78°, 26.47° and 27.74°, indicating that the Ti-MOR prepared through the above steps does not destroy its MOR topological structure. Example 2:

[0034] S1. Use industrial hydrogen mordenite as the parent body and place it in a muffle furnace for calcination activation treatment. The mass of the mordenite is 10 g, the calcination temperature is 700 °C, and the calcination time is 6 hours.

[0035] S2. Mix the mordenite zeolite molecular sieve treated in S1 with a 6 mol / L nitric acid solution at a solid-liquid ratio of 1 g:10 mL, and carry out reflux pickling for 10 hours. After filtration, washing, drying and calcination, the dealuminated mordenite zeolite molecular sieve is obtained. The pickling temperature is 140 °C and the pressure is normal pressure; the drying temperature is 80 °C and the time is 12 hours; the calcination temperature is 550 °C and the time is 6 hours.

[0036] S3. Disperse the dealuminated mordenite zeolite molecular sieve prepared in S2 into an ammonium hexafluorotitanate solution with a certain concentration. Then, place the above-mentioned mixed solution into the polytetrafluoroethylene container 4, stir the inside of the polytetrafluoroethylene container 4 to carry out the liquid-solid phase titanation reaction. The titanation time is 6 hours, the titanation temperature is 30 °C, and the pressure is normal pressure.

[0037] S4. Filter the liquid-solid phase, wash the sample by suction filtration with hot deionized water, and then place the washed sample in an oven for drying and calcine it in a muffle furnace successively to finally obtain the titanium-containing mordenite molecular sieve Ti-MOR. The temperature of the deionized water is 60 °C; the drying temperature is 80 °C and the time is 12 hours; the calcination temperature is 550 °C and the time is 6 hours.

[0038] As shown in the Figure 1 XRD spectrum attached, the above-mentioned titanium-containing mordenite molecular sieve prepared by the liquid-solid phase titanation reaction shows typical diffraction peaks of the MOR topological structure at 2 θ = 9.78, 13.59°, 19.70°, 22.45°, 25.78°, 26.47° and 27.74°, indicating that the Ti-MOR prepared through the above steps does not destroy its MOR topological structure.

[0039] Comparative Example 1:

[0040] The difference from step S1 of Example 1 is that the mordenite molecular sieve is not calcined, and the rest is the same as in Example 1.

[0041] Comparative Example 2:

[0042] The difference from step S1 of Example 2 is that the mordenite molecular sieve is not calcined, and the rest is the same as in Example 2.

[0043] Comparative Example 3:

[0044] The difference from step S2 of Example 1 is that 6 mol / L sulfuric acid is used for molecular sieve dealumination, and the rest is the same as in Example 1.

[0045] Comparative Example 4:

[0046] The difference from step S2 of Example 1 is that 6 mol / L hydrochloric acid is used for molecular sieve dealumination, and the rest is the same as in Example 1.

[0047] Comparative Example 5:

[0048] The difference from step S3 of Example 1 is that the titanation temperature is 60 °C, and the rest is the same as in Example 1.

[0049] Comparative Example 6:

[0050] The difference from step S3 of Example 2 is that the titanation temperature is 60 °C, and the rest is the same as in Example 2.

[0051] Comparative Example 7:

[0052] The difference from step S3 of Example 1 is that the concentration of the titanium source solution is 0.1 mol / L, and the rest is the same as in Example 1.

[0053] Comparative Example 8:

[0054] Differing from step S3 of Example 2, the concentration of the titanium source solution is 0.1 mol / L, and the rest is the same as in Example 2.

[0055] Comparative Example 9:

[0056] Differing from step S4 of Example 1, the temperature of the hot deionized water washing is 40 degrees Celsius, and the rest is the same as in Example 1.

[0057] Application of titanium silicalite molecular sieve with MOR structure in ammoximation reaction. The specific implementation steps are as follows:

[0058] (1) Use the titanium silicalite zeolite molecular sieves prepared in Example 1 and Example 2 as catalysts, with a dosage of 0.2 grams.

[0059] (2) Independently design the butanone ammoximation reaction process. Among them, the raw material ratio is: the molar ratio of butanone to hydrogen peroxide is 1:1.1, and the molar ratio of butanone to ammonia water is 1:1.6. The reaction conditions are: temperature 65 degrees Celsius, normal pressure, solvent 85% tert-butanol, and the contact time between the reaction raw material liquid and the titanium silicalite zeolite molecular sieve catalyst is 120 minutes. After the reaction is completed, the slurry is centrifuged, and the filtrate is analyzed by gas chromatography and the butanone conversion rate and butanone oxime selectivity are calculated.

[0060] (3) Independently design the cyclohexanone ammoximation reaction process. Among them, the raw material ratio is: the molar ratio of cyclohexanone to hydrogen peroxide is 1:1.2, and the molar ratio of cyclohexanone to ammonia water is 1:1.7. The reaction conditions are: temperature 70 degrees Celsius, normal pressure, solvent 85% tert-butanol, and the contact time between the reaction raw material liquid and the titanium silicalite zeolite molecular sieve catalyst is 120 minutes. After the reaction is completed, the slurry is centrifuged, and the filtrate is analyzed by gas chromatography and the cyclohexanone conversion rate and cyclohexanone oxime selectivity are calculated. The catalytic reaction results are as follows:

[0061] Use the catalysts prepared in Comparative Examples 1 to 9 respectively, and carry out butanone ammoximation and cyclohexanone ammoximation reactions according to the above steps, and the following results are obtained:

[0062] A preparation device for titanium-silicalite molecular sieve is applied to the preparation method of titanium-silicalite molecular sieve, and includes a base 1, a lifting mechanism, a placement plate 2 and a positioning mechanism. An ultrasonic oscillator 3 is arranged on the base 1, the placement plate 2 is arranged inside the ultrasonic oscillator 3, and a polytetrafluoroethylene container 4 is arranged on the placement plate 2 through the positioning mechanism. The lifting mechanism is used to drive the placement plate 2 to lift, so as to take out or put into the polytetrafluoroethylene container 4 from inside the ultrasonic oscillator 3. The lifting mechanism includes a support column 5 arranged on the base 1, a support base 6 is arranged on the support column 5, a motor 7 is installed on the support base 6, the power output end of the motor 7 is connected to a first threaded rod 8, a moving block 9 is installed on the first threaded rod 8, and the outside of the moving block 9 is connected to a lifting frame 11 through an adapter plate 10. The placement plate 2 is installed inside the lifting frame 11. As the motor 7 drives the first threaded rod 8 to rotate, the slider 13 slides along the length direction of the chute inside the slide rail 12, converting the rotational motion into a linear motion, driving the moving block 9 to move on the support column 5, so as to lift the moving frame, and let the placement plate 2 drive the polytetrafluoroethylene container 4 to be taken out from inside the ultrasonic oscillator 3. A slide rail 12 is arranged outward on one side of the support column 5 facing the support base 6, a slider 13 is arranged inside the slide rail 12, and the slider 13 is connected to the moving block 9, which is convenient for driving the movement of the lifting frame 11. The positioning mechanism includes a fixing plate 14 arranged on the surface of the placement plate 2, a second threaded rod 15 is horizontally inserted inside the fixing plate 14, a limiting clamp 16 is arranged at one end of the second threaded rod 15 facing the polytetrafluoroethylene container 4, and a handle 17 is arranged at the other end of the second threaded rod 15 away from the limiting clamp 16. A circular groove for placing the polytetrafluoroethylene container 4 is opened at the center of the surface of the placement plate 2. As the handle 17 rotates, it drives the second threaded rod 15 to axially feed inside the fixing plate 14, so that the limiting clamp 16 moves towards the polytetrafluoroethylene container 4. And the positioning mechanism is arranged in two, and a limiting area for fixing the polytetrafluoroethylene container 4 is formed between the two limiting clamps 16. Threaded holes adapted to the second threaded rod 15 are opened on the surface of the fixing plate 14, so that the second threaded rod 15 can axially feed towards the polytetrafluoroethylene container 4 after rotation.

[0063] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include that the first and second features are not in direct contact but through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the first feature is at a lower horizontal height than the second feature.

[0064] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing titanium mordenite molecular sieve, characterized in that: The following steps are involved: S1, using 10-30 g of industrial hydrogen-type mordenite as the matrix, placing it in a muffle furnace for calcination activation treatment, the calcination temperature is 700 degrees Celsius, and the calcination time is 6 hours; S2, the mordenite molecular sieve treated with S1 is acid-washed and dealuminized with nitric acid, sulfuric acid or hydrochloric acid solution, the selected solution concentration is 6 mol / L, the acid washing temperature is 120-150 degrees Celsius under normal pressure, the acid washing time is 8-12 hours, the solid-liquid ratio of the mordenite molecular sieve to the selected solution is 1g: (10-20) mL, after filtering and washing, it is dried in an oven at a temperature of 80 degrees Celsius for 12 hours, and calcined in a muffle furnace at a calcination temperature of 550 degrees Celsius for 6 hours to obtain the dealuminized mordenite molecular sieve; S3, dispersing the dealuminated mordenite molecular sieve prepared in S2 into an ammonium fluorotitanate solution with a concentration of 0.1-0.5 mol / L, and subjecting the ammonium fluorotitanate solution to titanation at normal pressure for 1-6 hours, at a titanation temperature of 20-60 degrees Celsius, and a solid-liquid ratio of the dealuminated mordenite molecular sieve to the ammonium fluorotitanate solution of 1 g: (10-20) mL, and then placing the dealuminated mordenite molecular sieve dispersion into a polytetrafluoroethylene container, and placing the polytetrafluoroethylene container in an ultrasonic oscillator, stirring and ultrasonicating, and conducting a liquid-solid phase titanation reaction; S4. Filter the liquid-solid phase, use hot deionized water at a temperature of 40-80 degrees Celsius to filter and wash the sample, and place the washed sample in an oven at a temperature of 80 degrees Celsius to dry for 12 hours. After drying, place it in a muffle furnace at a calcination temperature of 550 degrees Celsius for 6 hours to finally obtain titanium mordenite molecular sieve Ti-MOR.

2. The method for preparing titanium mordenite molecular sieve according to claim 1, characterized in that: The titanium mordenite molecular sieve preparation device adopted in the method comprises a base (1), a lifting mechanism, a placement plate (2) and a positioning mechanism, an ultrasonic oscillator (3) is arranged on the base (1), the placement plate (2) is arranged in the ultrasonic oscillator (3), a polytetrafluoroethylene container (4) is arranged on the placement plate (2) via the positioning mechanism, and the lifting mechanism is used to drive the placement plate (2) to lift and lower, so as to take the polytetrafluoroethylene container (4) out of or put it into the ultrasonic oscillator (3).

3. The method for preparing titanium mordenite molecular sieve according to claim 2, characterized in that: In the titanium mordenite molecular sieve preparation device adopted by the method, the lifting mechanism comprises a support column (5) arranged on a base (1), a support base (6) is arranged on the support column (5), a motor (7) is installed on the support base (6), a first threaded rod (8) is connected to the power output end of the motor (7), a moving block (9) is installed on the first threaded rod (8), the outer side of the moving block (9) is connected to a lifting frame (11) through a connecting plate (10), and the placement plate (2) is installed in the lifting frame (11).

4. The method for preparing titanium mordenite molecular sieve according to claim 3, characterized in that: In the titanium mordenite molecular sieve preparation device used in the method, a slide rail (12) is provided outwardly on the side of the support column (5) facing the support base (6), a slider (13) is provided inside the slide rail (12), and the slider (13) is connected to the moving block (9).

5. The method for preparing titanium mordenite molecular sieve according to claim 4, characterized in that: In the titanium mordenite molecular sieve preparation device adopted by the method, the positioning mechanism comprises a fixing plate (14) arranged on the surface of the placement plate (2), a second threaded rod (15) is transversely inserted into the fixing plate (14), a limiting clamp (16) is arranged at one end of the second threaded rod (15) facing the polytetrafluoroethylene container (4), and a handle (17) is arranged at one end of the second threaded rod (15) away from the limiting clamp (16).

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