Production process of propoxylated neopentyl glycol

Abstract

The invention relates to the technical field of photocureable coating monomer intermediates, in particular to a propoxylated neopentyl glycol production process, which comprises the following steps: carrying out quantitative addition reaction on epoxypropane and neopentyl glycol serving as raw materials under the action of a basic catalyst to obtain a crude product; and rectifying the propoxylated neopentyl glycol crude product to obtain a low-color-number propoxylated neopentyl glycol product. The alkali metal catalyst is inserted and mounted through the inserting mechanism, the alkali metal catalyst is conveniently and rapidly replaced, stirring and circular flowing of raw materials are achieved through the stirring mechanism and the circulating mechanism, the temperature and time of the synthesis reaction can be effectively reduced, the high efficiency, stability and convenience of the device are improved, and the device is suitable for large-scale popularization and application. And rectifying to obtain a low-color-number propoxylated neopentyl glycol product.

Description

Technical Field

[0001] The invention relates to the technical field of photocurable coating monomer intermediates, in particular to a production process of propoxylated neopentyl glycol. Background Art

[0002] In the chemical industry, propoxylated neopentyl glycol is an important organic chemical intermediate. Its application covers many industries such as coatings, plastics, and polyurethanes. With the rapid development of these downstream industries, the demand for propoxylated neopentyl glycol is also increasing. With the increasingly stringent environmental regulations, the chemical industry has an increasingly urgent need for green and sustainable production processes. For the production process of propoxylated neopentyl glycol, developing a new process that is efficient, environmentally friendly, and can produce high-quality products has become the development direction of the industry.

[0003] The existing device mainly uses neopentyl glycol ether as a solvent to dissolve neopentyl glycol to accelerate the addition reaction of neopentyl glycol and propylene oxide. The existing technology is similar to a method for preparing dihydroxypropyl neopentyl glycol ether. The method with publication number CN106397134A uses neopentyl glycol as a raw material, uses the product dihydroxypropyl neopentyl glycol ether as a solvent, adds tri(4-methoxyphenyl)phosphine catalyst, and then uses propylene oxide as a chain extender to synthesize dihydroxypropyl neopentyl glycol ether. The present application is applied to the synthesis of dihydroxypropyl neopentyl glycol ether, which has the advantages of high product content, low neopentyl glycol content, low content of propylene alcohol by-products, and stable quality. However, the device still has areas that can be optimized

[0004] The existing method generally adopts the reaction in the form of adding propylene oxide to neopentyl glycol under pressurized conditions. Although this method can moderately reduce the color number of the product, the reaction time is long and the reaction temperature is high. After decolorization, the color number of the final product is still high, which reduces the work efficiency and practicality of the process. Therefore, in order to solve the above problems, a propoxylated neopentyl glycol production process is proposed. Summary of the invention

[0005] The object of the present invention is to provide a process for producing propoxylated neopentyl glycol to solve the problem in the prior art mentioned in the above background technology that it is difficult to reduce the reaction temperature, shorten the reaction time, and obtain a low color number product through a distillation process.

[0006] To achieve the above object, the present invention provides the following technical solution: a process for producing propoxylated neopentyl glycol, comprising a base, a reactor, a delivery pump, a distillation tower, a cooler, a reboiler, a temperature control component, a stirring mechanism, a circulation mechanism and a plug-in mechanism, characterized in that the process comprises the following steps:

[0007] S1, adding neopentyl glycol and propylene oxide into a reactor at a molar ratio of 1:2, and then fixing a catalyst containing 0.5% of neopentyl glycol by mass in the reactor through a plug-in mechanism;

[0008] S2, injecting nitrogen through the feed port of the reactor so that the nitrogen completely replaces the air in the reactor;

[0009] S3, raising the temperature of the raw materials in the reactor by the temperature control component so that the temperature of the raw materials inside the reactor is maintained at 70-80°C;

[0010] S4, circulating the raw materials through the circulation mechanism, so that the neopentyl glycol and propylene oxide can be fluidized and contacted with the catalyst in the reaction filter cartridge;

[0011] S5, stirring the raw materials by a stirring mechanism, so that the neopentyl glycol and propylene oxide are evenly mixed and reacted for 2-4 hours until the reaction is completed;

[0012] S6, transferring the reacted raw materials to the interior of the distillation tower through a delivery pump, and heating the raw materials through a reboiler and maintaining the temperature at 165-180° C.;

[0013] S7, controlling the bottom temperature of the distillation tower to be maintained at 165-180°C, the bottom pressure to be maintained at 500-6000Pa, controlling the top temperature of the distillation tower to be maintained at 90-115°C, and the top pressure to be maintained at 150-2500Pa;

[0014] S8. Maintain the reflux ratio of the condenser at 1:2-1:3, and the distillate product in the temperature range of 130-150° C. is propoxylated neopentyl glycol.

[0015] Preferably, the bottom of the reactor is fixedly connected to the top right side of the base, the bottom of the distillation tower is fixedly connected to the top left side of the base, the reactor is connected to the distillation tower through a delivery pump, the cooler is connected to the upper left side of the distillation tower, the reboiler is connected to the lower left side of the distillation tower, the top of the base is located on the front side of the distillation tower and is fixedly connected with a control console, the bottom of the inner wall of the reactor is fixedly connected with a heating assembly, the middle of the top of the reactor is fixedly connected with a drive box, the top of the drive box is fixedly connected with a transmission box, and the top right side of the reactor is fixedly connected with a circulating pump.

[0016] Preferably, the stirring mechanism includes a servo motor, the rear side of the servo motor is fixedly connected to the front side of the transmission box, the circulation mechanism includes a linkage shaft, the front end of the linkage shaft is movably connected to the front side of the inner wall of the circulation pump, and the rear end of the linkage shaft passes through the rear side wall of the circulation pump, the plug-in mechanism includes a connecting pipe, the top feed port of the connecting pipe is fixedly connected to the top of the inner wall of the reactor, and the output port of the circulation pump passes through the top of the reactor and is connected to the top of the connecting pipe.

[0017] Preferably, a transmission worm is fixedly connected to the middle part of the rear side of the servo motor, the rear end of the transmission worm passes through a transmission box, the outer wall of the transmission worm is located inside the transmission box and is meshedly connected with a transmission worm wheel, the inner wall of the transmission worm wheel is fixedly connected to a transmission shaft, and the top end of the transmission shaft is movably connected to the top of the inner wall of the transmission box.

[0018] Preferably, the bottom end of the transmission shaft passes through the drive box and is fixedly connected to a main gear, the rear side of the outer wall of the main gear is meshingly connected to an internal gear, the bottom of the internal gear is fixedly connected to a rotating disk, and the top center axis of the rotating disk is movably connected to the top of the inner wall of the drive box.

[0019] Preferably, a rotating rod is fixedly connected to the middle of the bottom of the rotating disk, the bottom end of the rotating rod passes through the top of the reactor and is fixedly connected to a stirring head, and the stirring head is arranged at the lower part of the reactor.

[0020] Preferably, the rear end of the transmission worm is fixedly connected to a driving pulley, the outer wall of the driving pulley is tightly attached to a linkage belt, the left side of the inner wall of the linkage belt is tightly attached to a driven pulley, and the front middle part of the driven pulley is fixedly connected to the rear end of the linkage shaft.

[0021] Preferably, a threaded blade is fixedly connected to the front side of the outer wall of the linkage shaft, a sealing ring is fixedly connected to the rear side of the outer wall of the linkage shaft, and the outer wall of the sealing ring is movably connected to the movable hole of the rear wall of the circulation pump.

[0022] Preferably, a mounting joint is inserted into the right side wall of the connecting pipe, a catalytic filter cartridge is threadedly connected to the left side of the mounting joint, and an alkali metal catalyst is installed inside the catalytic filter cartridge.

[0023] Preferably, a kettle body clamp is fixedly connected to the right side of the mounting joint, an outer wall of the kettle body clamp is inserted above the right side of the reactor, and a sealing cover is fixedly connected to the right side of the kettle body clamp.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention uses the transmission worm, transmission worm wheel, transmission shaft, main gear, internal gear, rotating disk, rotating rod and stirring head and other structures in the servo motor in the stirring mechanism. The servo motor is started through the control console to drive the transmission worm to limit rotation, the transmission worm meshing drives the transmission worm wheel to rotate, the transmission worm wheel drives the transmission shaft and the main gear to limit rotation, the main gear meshing drives the internal gear and the rotating disk to limit rotation, and the rotating disk drives the rotating rod and the stirring head to rotate synchronously, thereby realizing the stirring of the raw materials, so that part of the device can mix the raw materials evenly, which is convenient for shortening the synthesis time of the raw materials and improving the efficiency and practicality of the device.

[0026] 2. The present invention uses the structures of the active pulley, linkage belt, driven pulley, linkage shaft, threaded blades and sealing ring in the circulation mechanism, and drives the active pulley to rotate through the transmission worm. The rotation of the active pulley drives the driven pulley and the linkage shaft to rotate within a limited position through the linkage belt, and the linkage shaft drives the threaded blades to rotate within a limited position, thereby realizing the circulation of raw materials. Part of the device can drive the raw materials at the bottom of the reactor to be circulated and transported to the connecting pipe, which is convenient for the raw materials to flow into contact with the alkali metal catalyst for catalytic reaction, thereby improving the stability and practicality of the device.

[0027] 3. The present invention uses structures such as a connecting pipe, a mounting joint, a catalytic filter cartridge, a kettle body clamp and a sealing cover in the plug-in mechanism. The catalytic filter cartridge containing an alkali metal catalyst is inserted into the interior of the connecting pipe through the mounting joint, and the catalytic filter cartridge containing an alkali metal catalyst is installed on the upper right side of the reactor through the kettle body clamp and the sealing cover, thereby realizing the plug-in installation of the alkali metal catalyst, allowing some devices to quickly assemble the catalytic filter cartridge packaged with the alkali metal catalyst, thereby improving the convenience and practicality of the device.

[0028] 4. In the reaction process of propylene oxide and neopentyl glycol, even with nitrogen protection, the color number of the product will deepen with the increase of reaction time and the increase of reaction temperature. The synthesis reaction temperature of propoxylated neopentyl glycol in the present invention is low, the reaction time is short, and a propoxylated neopentyl glycol product with a low color number is obtained by distillation. The color number problem cannot be solved by conventional changes in process conditions and activated carbon filtration, but a low color number product of 5-10# can be obtained by distillation, which improves the efficiency and practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front side perspective view of the structure of the present invention;

[0030] Figure 2 It is a front cross-sectional perspective view of the structure of the reactor of the present invention;

[0031] Figure 3 It is a bottom-view cross-sectional perspective view of a partial structure of a transmission box and a stirring mechanism of the present invention;

[0032] Figure 4 It is a side cross-sectional perspective view of the local structure of the driving box and the stirring mechanism of the present invention;

[0033] Figure 5 It is a top view of the structure of the reactor of the present invention;

[0034] Figure 6 It is a top-view cross-sectional perspective view of a local structure of a circulation pump and a circulation mechanism of the present invention;

[0035] Figure 7It is a front cross-sectional stereoscopic view of the local structure of the connecting pipe and the plug-in mechanism of the present invention.

[0036] In the figure: 101, base; 102, reactor; 103, delivery pump; 104, distillation tower; 105, cooler; 106, reboiler; 107, control console; 108, heating assembly; 109, drive box; 110, transmission box; 111, circulation pump; 2, stirring mechanism; 201, servo motor; 202, transmission worm; 203, transmission worm wheel; 204, transmission shaft; 205, main gear; 206, internal gear; 207, rotating disk; 208, rotating rod; 209, stirring head; 3, circulation mechanism; 301, driving pulley; 302, linkage belt; 303, driven pulley; 304, linkage rotating shaft; 305, threaded blade; 306, sealing ring; 4, plug-in mechanism; 401, connecting pipe; 402, fitting joint; 403, catalytic filter cartridge; 404, kettle body clamp; 405, cover. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-Figure 7 , an embodiment provided by the present invention:

[0039] A process for producing propoxylated neopentyl glycol comprises a base 101, a reactor 102, a delivery pump 103, a distillation tower 104, a cooler 105, a reboiler 106, a temperature control component 108, a stirring mechanism 2, a circulation mechanism 3 and a plug-in mechanism 4, wherein the bottom of the reactor 102 is fixedly connected to the top right side of the base 101, the bottom of the distillation tower 104 is fixedly connected to the top left side of the base 101, the reactor 102 is connected to the distillation tower 104 via the delivery pump 103, The cooler 105 is connected to the upper left side of the distillation tower 104, the reboiler 106 is connected to the lower left side of the distillation tower 104, the top of the base 101 is located at the front side of the distillation tower 104 and is fixedly connected to a control console 107, the bottom of the inner wall of the reactor 102 is fixedly connected to a heating assembly 108, the middle of the top of the reactor 102 is fixedly connected to a drive box 109, the top of the drive box 109 is fixedly connected to a transmission box 110, and the top right side of the reactor 102 is fixedly connected to a circulating pump 111;

[0040] The stirring mechanism 2 includes a servo motor 201, the rear side of the servo motor 201 is fixedly connected to the front side of the transmission box 110, and a transmission worm 202 is fixedly connected to the middle part of the rear side of the servo motor 201. The rear end of the transmission worm 202 passes through the transmission box 110, and the outer wall of the transmission worm 202 is located inside the transmission box 110 and is meshed with a transmission worm wheel 203. The inner wall of the transmission worm wheel 203 is fixedly connected to a transmission shaft 204, and the top of the transmission shaft 204 is movably connected to the top of the inner wall of the transmission box 110. Through this design, the servo motor 201 drives the transmission worm 202 to rotate in a limited position, so that the transmission worm 202 meshes and drives the transmission worm wheel 203 and the transmission shaft 204 to rotate in a limited position. The bottom end of the transmission shaft 204 passes through the drive box 109 and is fixedly connected to a main gear 205. The main gear 20 5 is meshedly connected with an internal gear 206 at the rear side of the outer wall, and a rotating disk 207 is fixedly connected to the bottom of the internal gear 206, and the top center axis of the rotating disk 207 is movably connected to the top of the inner wall of the driving box 109. Through this design, it is realized that the transmission shaft 204 drives the main gear 205 to rotate in a limited position, so that the main gear 205 meshes and drives the internal gear 206 and the rotating disk 207 to rotate in a limited position: a rotating rod 208 is fixedly connected to the middle of the bottom of the rotating disk 207, and the bottom end of the rotating rod 208 passes through the top of the reactor 102 and is fixedly connected with a stirring head 209, and the stirring head 209 is arranged at the lower part of the reactor 102. Through this design, it is realized that the rotating disk 207 drives the rotating rod 208 and the stirring head 209 to rotate in a limited position, so that the stirring head 209 stirs and mixes the raw materials inside the reactor 102.

[0041] The circulation mechanism 3 includes a linkage shaft 304, the front end of which is movably connected to the front side of the inner wall of the circulation pump 111, and the rear end of the linkage shaft 304 passes through the rear wall of the circulation pump 111. The rear end of the transmission worm 202 is fixedly connected to a driving pulley 301, and the outer wall of the driving pulley 301 is closely attached to a linkage belt 302, and the left side of the inner wall of the linkage belt 302 is closely attached to a driven pulley 303, and the middle part of the front side of the driven pulley 303 is fixedly connected to the rear end of the linkage shaft 304. Through this design, the transmission worm 202 is realized through the driving pulley 301, the linkage belt 302 The driven pulley 303 drives the linkage shaft 304 to limit the rotation, so that the stirring mechanism 2 can be linked to the circulation mechanism 3. The front side of the outer wall of the linkage shaft 304 is fixedly connected with a threaded blade 305, and the rear side of the outer wall of the linkage shaft 304 is fixedly connected with a sealing ring 306. The outer wall of the sealing ring 306 is movably connected to the movable hole on the rear side wall of the circulation pump 111. Through this design, the linkage shaft 304 drives the threaded blade 305 to limit the rotation, so that the raw materials at the bottom of the reactor 102 are circulated and transported to the connecting pipe 401, which is convenient for the raw materials to flow into contact with the alkali metal catalyst for catalytic reaction.

[0042] The plug-in mechanism 4 includes a connecting pipe 401, a top feed port of the connecting pipe 401 is fixedly connected to the top of the inner wall of the reactor 102, an output port of the circulating pump 111 passes through the top of the reactor 102 and is connected to the top of the connecting pipe 401, a mounting joint 402 is inserted into the right side wall of the connecting pipe 401, a catalytic filter cartridge 403 is threadedly connected to the left side of the mounting joint 402, and an alkali metal catalyst is installed inside the catalytic filter cartridge 403. Through this design, the catalytic filter cartridge 403 containing the alkali metal catalyst is installed on the mounting joint 402, a kettle body clamp 404 is fixedly connected to the right side of the mounting joint 402, the outer wall of the kettle body clamp 404 is inserted on the upper right side of the reactor 102, and a cover 405 is fixedly connected to the right side of the kettle body clamp 404. Through this design, the catalytic filter cartridge 403 containing the alkali metal catalyst is installed on the upper right side of the reactor 102, which is convenient for quick replacement of the alkali metal catalyst.

[0043] The method for synthesizing propoxylated neopentyl glycol of the present invention uses propylene oxide and neopentyl glycol as raw materials, firstly performs an addition reaction of the raw materials under the catalysis of a catalyst to generate a crude propoxylated neopentyl glycol product, and then obtains a propoxylated neopentyl glycol product with high purity and low color number through distillation.

[0044] Example 1

[0045] The first step is addition reaction: neopentyl glycol and propylene oxide are added to the reactor at a molar ratio of 1:2, and then 0.5% of the mass of neopentyl glycol is added as catalyst KOH, the air in the kettle is replaced with nitrogen, stirring and heating reaction is started, and the reaction is completed for 2 hours under the conditions of reactor temperature of 75-80°C and reaction pressure of 4-5kg.

[0046] The second step is distillation: slowly heat the bottom liquid under vacuum, and distill under the conditions of 165-180℃, 500Pa in the bottom state, 90-115℃, 150Pa in the top state, and reflux ratio of 1:2. The product propoxylated neopentyl glycol is obtained by extracting the fraction in the temperature range of 130-150℃ through distillation. The hydroxyl value of the product is 53mgKOH / g, the water content is 0.1%, and the color number is 15#.

[0047] Example 2

[0048] The first step is addition reaction: neopentyl glycol and propylene oxide are added to the reactor at a molar ratio of 1:2, and then a catalyst KOH with a mass percentage of 0.5% of trimethylolpropane is added, the air in the kettle is replaced with nitrogen, and stirring and heating reaction is started. The reaction is carried out for 2 hours at a reactor temperature of 75-80°C and a reaction pressure of 4-5kg, and the reaction is completed.

[0049] The second step is distillation: slowly heat the bottom liquid under vacuum, and distill under the conditions of 165-180℃, 500Pa in the bottom state, 90-115℃, 150Pa in the top state, and reflux ratio of 1:3. The product propoxylated neopentyl glycol is obtained by extracting the fraction in the temperature range of 130-150℃ through distillation. The hydroxyl value of the product is 54mgKOH / g, the moisture content is 0.1%, and the color number is 10#.

[0050] Comparative Example 1

[0051] The first step is addition reaction: neopentyl glycol and propylene oxide are added to the reactor at a molar ratio of 1:2, and then a catalyst KOH with a mass percentage of 0.5% of trimethylolpropane is added, the air in the kettle is replaced with nitrogen, and stirring and heating reaction is started. The reaction is carried out for 2 hours at a reactor temperature of 75-80°C and a reaction pressure of 4-5kg, and the reaction is completed.

[0052] Step 2, post-treatment: add 0.5% activated carbon by mass to the above crude product, stir, heat to 80°C, adsorb and decolorize for 30 minutes, filter while hot to obtain the product propoxylated neopentyl glycol. The product has a hydroxyl value of 51 mgKOH / g, a moisture content of 0.12%, and a color number of 75#.

[0053] The dihydroxypropyl neopentyl glycol ether prepared in the above embodiments and comparative examples was tested, and the specific indicators are shown in Table 1.

[0054] Table 1: Performance comparison of products under different implementation conditions

[0055]

[0056] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A process for producing propoxylated neopentyl glycol, comprising a base (101), a reaction kettle (102), a delivery pump (103), a distillation tower (104), a cooler (105), a reboiler (106), a temperature control component (108), a stirring mechanism (2), a circulation mechanism (3) and a plug-in mechanism (4), characterized in that: The steps include: S1, adding neopentyl glycol and propylene oxide into a reaction kettle (102) at a molar ratio of 1:2, and then fixing a catalyst containing 0.5% of the mass of neopentyl glycol in the reaction kettle (102) through a plug-in mechanism (4); S2, injecting nitrogen through the feed port of the reaction kettle (102) so that the nitrogen completely replaces the air in the reaction kettle (101); S3, raising the temperature of the raw materials in the reaction kettle (101) by the temperature control component (108), so that the temperature of the raw materials in the reaction kettle (101) is maintained at 70-80° C.; S4, circulating the raw materials through the circulation mechanism (3), so that the neopentyl glycol and propylene oxide can be fluidized and contacted with the catalyst in the reaction filter cartridge (102); S5, stirring the raw materials by means of a stirring mechanism (2) so that the neopentyl glycol and propylene oxide are evenly mixed and react for 2-4 hours until the reaction is completed; S6, transferring the reacted raw materials to the interior of the distillation tower (104) through the delivery pump (103), and heating the raw materials through the reboiler (106) and maintaining the temperature at 165-180°C; S7, controlling the bottom temperature of the distillation tower (104) to be maintained at 165-180° C. and the bottom pressure to be maintained at 500-6000 Pa, controlling the top temperature of the distillation tower (104) to be maintained at 90-115° C. and the top pressure to be maintained at 150-2500 Pa; S8. Maintain the reflux ratio of the condenser (103) at 1:2-1:3, and the distillate product in the temperature range of 130-150°C is propoxylated neopentyl glycol.

2. A process for producing propoxylated neopentyl glycol according to claim 1, characterized in that: The bottom of the reaction kettle (102) is fixedly connected to the right side of the top of the base (101), the bottom of the distillation tower (104) is fixedly connected to the left side of the top of the base (101), the reaction kettle (102) is connected to the distillation tower (104) via a delivery pump (103), the cooler (105) is connected to the upper left side of the distillation tower (104), the reboiler (106) is connected to the lower left side of the distillation tower (104), the top of the base (101) is located in front of the distillation tower (104) and is fixedly connected to a control console (107), the bottom of the inner wall of the reaction kettle (102) is fixedly connected to a heating assembly (108), the middle of the top of the reaction kettle (102) is fixedly connected to a drive box (109), the top of the drive box (109) is fixedly connected to a transmission box (110), and the right side of the top of the reaction kettle (102) is fixedly connected to a circulation pump (111).

3. A process for producing propoxylated neopentyl glycol according to claim 2, characterized in that: The stirring mechanism (2) comprises a servo motor (201), the rear side of the servo motor (201) is fixedly connected to the front side of the transmission box (110), the circulation mechanism (3) comprises a linkage shaft (304), the front end of the linkage shaft (304) is movably connected to the front side of the inner wall of the circulation pump (111), and the rear end of the linkage shaft (304) passes through the rear side wall of the circulation pump (111), and the plug-in mechanism (4) comprises a connecting pipe (401), the top feed port of the connecting pipe (401) is fixedly connected to the top of the inner wall of the reaction kettle (102), and the output port of the circulation pump (111) passes through the top of the reaction kettle (102) and is connected to the top of the connecting pipe (401).

4. A process for producing propoxylated neopentyl glycol according to claim 3, characterized in that: A transmission worm (202) is fixedly connected to the middle of the rear side of the servo motor (201), the rear end of the transmission worm (202) passes through the transmission box (110), the outer wall of the transmission worm (202) is located inside the transmission box (110) and is meshedly connected to a transmission worm wheel (203), the inner wall of the transmission worm wheel (203) is fixedly connected to a transmission shaft (204), and the top end of the transmission shaft (204) is movably connected to the top of the inner wall of the transmission box (110).

5. A process for producing propoxylated neopentyl glycol according to claim 4, characterized in that: The bottom end of the transmission shaft (204) passes through the drive box (109) and is fixedly connected to a main gear (205); the rear side of the outer wall of the main gear (205) is meshedly connected to an internal gear (206); the bottom of the internal gear (206) is fixedly connected to a rotating disk (207); the top center axis of the rotating disk (207) is movably connected to the top of the inner wall of the drive box (109).

6. A process for producing propoxylated neopentyl glycol according to claim 5, characterized in that: A rotating rod (208) is fixedly connected to the middle of the bottom of the rotating disk (207), and the bottom end of the rotating rod (208) passes through the top of the reaction kettle (102) and is fixedly connected to a stirring head (209), and the stirring head (209) is arranged at the lower part of the interior of the reaction kettle (102).

7. A process for producing propoxylated neopentyl glycol according to claim 4, characterized in that: The rear end of the transmission worm (202) is fixedly connected to a driving pulley (301), the outer wall of the driving pulley (301) is closely attached to a linkage belt (302), the left side of the inner wall of the linkage belt (302) is closely attached to a driven pulley (303), and the front middle part of the driven pulley (303) is fixedly connected to the rear end of the linkage rotating shaft (304).

8. A process for producing propoxylated neopentyl glycol according to claim 7, characterized in that: A threaded blade (305) is fixedly connected to the front side of the outer wall of the linkage shaft (304), a sealing ring (306) is fixedly connected to the rear side of the outer wall of the linkage shaft (304), and the outer wall of the sealing ring (306) is movably connected to the movable hole of the rear side wall of the circulation pump (111).

9. A process for producing propoxylated neopentyl glycol according to claim 3, characterized in that: A mounting joint (402) is inserted into the right wall of the connecting pipe (401), and a catalytic filter cartridge (403) is threadedly connected to the left side of the mounting joint (402), and an alkali metal catalyst is installed inside the catalytic filter cartridge (403).

10. A process for producing propoxylated neopentyl glycol according to claim 9, characterized in that: The right side of the mounting joint (402) is fixedly connected to a kettle body clamp (404), the outer wall of the kettle body clamp (404) is inserted above the right side of the reaction kettle (102), and the right side of the kettle body clamp (404) is fixedly connected to a sealing cover (405).

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