Mixing device and method for degradable bio-based polyhydric alcohols / polyatomic acids

Abstract

The invention relates to the technical field of bio-based polyols, and discloses a mixing device capable of degrading bio-based polyols / polyprotic acids, the mixing device comprises a tank body and a heating device, the heating device comprises a gas outlet bin, the gas outlet bin is installed at the top of the tank body, the inner side of the gas outlet bin is connected with a gas inlet bin, the gas outlet bin is connected with a gas outlet pipe, and the gas outlet pipe is connected with a gas inlet pipe. The air inlet bin is connected with an air inlet pipe, a plurality of ventilation pipes are slidably installed on the inner wall of the air inlet bin and the inner wall of the air outlet bin, and the bottoms of the ventilation pipes are connected with a plurality of circulating pipes respectively. Through the arrangement of the heating device, the multiple circulating pipes can exchange heat of steam in the circulating pipes into reactants in the tank body, so that the heating effect is achieved, and the multiple circulating pipes can increase the contact area with the reactants through vertical reciprocating motion, so that the heating rate is increased; and moreover, the heat contacted with reactants in the tank body is relatively uniform.

Description

Technical Field

[0001] The invention relates to the technical field of bio-based polyols, and in particular to a mixing device and method for degradable bio-based polyols / polyacids. Background Art

[0002] The synthesis of bio-based polyurethane materials is mainly through the introduction of biodegradable components or groups by blending or copolymerization, such as polylactic acid / polylactide (PLA), polyglycolic acid (PGA), etc. In recent years, oligomer polyol substitutes based on renewable resources have been successfully developed and synthesized by researchers, which has opened up a new direction for the preparation of green bio-based polyurethane materials. Among them, polyurethane synthesized with polylactic acid polyol (lactide polyol) as raw material is not only biodegradable, but also easy to recycle and reprocess, which can solve the white pollution and resource waste caused by non-degradable or thermosetting materials. Studies have shown that polylactic acid polyol is expected to be widely used in footwear, clothing, coatings, adhesives, 3D printing and other fields.

[0003] Chinese patent publication number CN215540859U discloses "a continuous preparation device for biomass-based polyols", including a first tank body and a second tank body, the first tank body is located above the second tank body, a liquid inlet is installed at the upper end of the first tank body, and a first motor is installed at the upper end of the first tank body, the output shaft of the first motor extends to the interior of the tank body and is connected to the upper end of the first stirring paddle, and an air inlet is provided at the lower end of the side wall of the first tank body. When the patent is used, the gas phase and the liquid phase react first in the first tank body, and the excess gas raw material is discharged through the outlet pipe. At this time, part of the reaction liquid is added to the second tank body, and the reaction liquid can react with the gas discharged from the outlet pipe to reduce the waste of gas raw materials. The first reflux pipe, the reflux pump and the second reflux pipe are coordinated to facilitate the full mixing of the reactants, which is suitable for the orderly progress of the reaction.

[0004] During the conception process, the applicant searched a large number of patent documents on the patent network. For example, Chinese patent publication number CN215540859U discloses "a continuous preparation device for biomass-based polyols". When heating the reactants, due to the long travel of the heating pipe, after the heat in the front section of the heating pipe is absorbed by the reactants, the heat in the rear section of the heating pipe will decrease, resulting in uneven temperatures in different sections of the heating pipe, which may cause the reactants in contact with the rear half of the heating pipe to be insufficiently heated, resulting in uneven heating. Therefore, a mixing device and method for degradable bio-based polyols / polyacids are proposed to solve the above-mentioned problems. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a mixing device and method for degradable bio-based polyols / polyacids, which solves the problem that when heating the reactants, due to the long travel of the heating pipe, the heat in the front section of the heating pipe is absorbed by the reactants, and the heat in the rear section of the heating pipe will decrease, resulting in uneven temperatures in different sections of the heating pipe, which may cause the reactants in contact with the rear half of the heating pipe to be insufficiently heated, thereby causing uneven heating.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solution: a degradable bio-based polyol / polyacid mixing device, comprising:

[0009] Tank;

[0010] A heating device for heating the reactants;

[0011] A material mixing device is used to make the reactants fall evenly into the tank;

[0012] A stirring component, used for stirring and mixing reactants;

[0013] A motor is installed on the tank body, and a rotating shaft is connected to the output end of the motor, and the rotating shaft is rotatably connected to the bottom of the inner wall of the tank body. A stabilizing bar is installed inside the tank body, and the inner wall of the stabilizing bar is rotatably connected to the rotating shaft. A discharge pipe is installed at the bottom of the tank body, and a valve is provided on the discharge pipe. The heating device is arranged on the tank body, the material mixing device is arranged on the tank body, and the stirring assembly is arranged inside the tank body. The heating device includes an air outlet bin, which is installed on the top of the tank body, and an air inlet bin is connected to the inner side of the air outlet bin, and an air outlet pipe is connected to the air outlet bin, and an air inlet pipe is connected to the air inlet bin. A plurality of ventilation pipes are slidably installed on the inner walls of the air inlet bin and the air outlet bin, and a plurality of circulation pipes are respectively connected to the bottoms of the plurality of ventilation pipes, and one circulation pipe is connected to two ventilation pipes.

[0014] Preferably, two fixing rings are connected to the plurality of circulation pipes, a sliding frame is slidably mounted on the inner wall of the tank body, and an annular inclined groove is provided on the rotating shaft.

[0015] Preferably, the sliding frame is slidably connected to the annular inclined groove via balls, and one of the fixing rings is connected to the sliding frame.

[0016] Preferably, a collecting box is installed on the air inlet pipe, a central axis is rotatably installed inside the collecting box, a fan blade is installed on one end of the central axis, a cleaning sheet is installed on the other end of the central axis, a filter is installed on the inner wall of the collecting box, the filter is connected to the air inlet pipe, and the cleaning sheet is in contact with the filter.

[0017] Preferably, the material leveling device comprises a buffer cylinder, which is mounted on the top of the tank body, and has two feed troughs installed inside the buffer cylinder, with a plurality of feed holes formed on the two feed troughs, and a plurality of feed pipes connected to the top of the buffer cylinder.

[0018] Preferably, a plurality of elastic strips are installed on the inner wall of the buffer cylinder, two shifting rods are installed on the rotating shaft, and one end of the plurality of elastic strips close to the rotating shaft is located on the movement tracks of the two shifting rods.

[0019] Preferably, the stirring assembly comprises a rotating frame, the rotating frame is mounted on a rotating shaft, a plurality of blades are mounted on the rotating frame, a stirring wheel is mounted on the rotating shaft, and the stirring wheel is located at the bottom of the tank body.

[0020] Preferably, two limit rods are installed at the bottom of the stabilizing rod, the bottom ends of the two limit rods are connected to the tank body, reciprocating brackets are slidably installed on the two limit rods, a reciprocating thread is provided on the rotating shaft, and the reciprocating bracket is slidably connected to the reciprocating thread through a ball.

[0021] Preferably, four grab buckets are hinged on the reciprocating bracket, and every two grab buckets form a group. Resistance plates are hinged on the grab buckets, and bent rods are connected to the resistance plates.

[0022] Preferably, a method for degrading bio-based polyols / polyacids comprises any one of the above-mentioned mixing devices for degrading bio-based polyols / polyacids, and further comprises the following steps:

[0023] Step 1: Raw material preparation, removing impurities from vegetable oil such as soybean oil through a refining process, and using the vegetable oil after impurities are removed as raw material;

[0024] Step 2: Preparation of epoxidized vegetable oil, by using a catalyst and an epoxidizing agent to convert the vegetable oil into epoxidized vegetable oil;

[0025] Step 3: Add the epoxidized vegetable oil and the catalyst into the tank, evacuate the air inside the tank to a vacuum state, and fill it with nitrogen to a normal pressure state;

[0026] Step 4: Heat the vegetable oil and catalyst in the tank to degrees Celsius through a heating device;

[0027] Step 5: The vegetable oil and the catalyst in the tank are stirred and mixed by a stirring component, and the temperature of the vegetable oil in the tank is reduced to degrees Celsius after the reaction is completed;

[0028] Step 6: Use tartaric acid ester to carry out the first ring-opening reaction of the epoxy group;

[0029] Step 7: using a second ring-opening reagent containing a secondary alcohol to carry out a second ring-opening reaction;

[0030] Step 8: Use primary alcohol to perform a third ring-opening reaction on the remaining epoxy groups;

[0031] Step 9: The reaction liquid enters the flash tank after decompression for rapid boiling and vaporization, and the two phases are separated. After the vaporization is completed, part of the methanol is recovered, and the excess methanol is further evaporated at degrees Celsius by a film evaporator;

[0032] Step 10: The recovered methanol is distilled and recovered by a distillation device to recover high-purity methanol for reuse;

[0033] Step 11: The material produced in the previous step is decolorized by activated clay and then filtered to obtain bio-based polyols. The excess water in the product is then evaporated and the water content is controlled;

[0034] Step 12: Use methanol to wash, wash off the adsorbed materials and catalysts and enter the intermediate tank, and then return to the first step reaction. Use a dryer to dry the white clay, and the methanol evaporated during the drying process is recovered by condensation.

[0035] (III) Beneficial effects

[0036] Compared with the prior art, the present invention provides a mixing device and method for degradable bio-based polyol / polyacid, which has the following beneficial effects:

[0037] 1. The mixing device and method of biodegradable bio-based polyol / polyacid, through the setting of the heating device, enables multiple circulation pipes to exchange the heat of the internal steam to the reactants in the tank body, thereby achieving the heating effect, and the multiple circulation pipes can increase the contact area with the reactants through vertical reciprocating motion, thereby improving the heating rate, and because the length of each circulation pipe is short and the steam transmission distance is short, the surface temperature of the entire circulation pipe is relatively uniform, so that the heat contacted by the reactants in the tank body is relatively uniform, avoiding the conventional steam heating pipe due to the long winding length of the pipe resulting in different pipe surface temperatures in different sections Uniform, so that the reactants in the tank are heated unevenly, resulting in uneven heating, which affects the subsequent reaction effect. Through the cooperation of the air outlet bin, the air inlet bin and the ventilation pipe, the steam in the circulation pipe can be discharged intermittently, which increases the residence time and utilization rate of the steam and avoids the waste of resources caused by long-term uninterrupted steam transportation and circulation. Through the setting of the cleaning sheet, the filter net, the collection box and the fan blades, the filter net can intercept the impurities carried by the steam in the air inlet pipe, and scrape them into the collection box through the rotation of the cleaning sheet, so as to avoid the air inlet pipe being blocked due to the accumulation of more impurities inside after long-term use, thereby affecting its use.

[0038] 2. The mixing device and method of the degradable bio-based polyol / polyacid, through the setting of the material mixing device, allows the reactants to drip evenly into the tank body through the multiple discharge holes on the two discharge troughs after the feed pipe adds the reactants into the buffer cylinder, thereby avoiding the reactants being concentratedly added into the tank body, resulting in a low degree of fusion between the reactants in the tank body, thereby requiring more stirring and mixing time and reducing work efficiency; through the setting of multiple elastic strips, the multiple elastic strips can promote the flow and dripping of the reactants through vibration, and when multiple reactants are added at the same time, the elastic strips can promote the initial fusion between the reactants through vibration, reducing the subsequent stirring and mixing time, thereby improving work efficiency.

[0039] 3. The mixing device and method of the degradable bio-based polyol / polyacid, through the setting of the stirring component, enables the multiple blades on the rotating frame to stir and mix the reactants inside the tank body at multiple angles, and through the rotation of the stirring wheel, the reactants at the bottom of the tank body are continuously stirred to avoid the sedimentation of the reactants at the bottom of the tank body, thereby affecting the mixing effect; through the cooperation of the grab bucket and the resistance plate, the two groups of grab buckets can continuously grab the reactants at the bottom of the tank body and transport them to the liquid level position above the tank body, further promoting the mixing of different reactants, avoiding the stratification phenomenon caused by the different masses of different reactants, making the stirring and mixing effect of the reactants in different height ranges uneven, thereby affecting the subsequent reaction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the appearance of a degradable bio-based polyol / polyacid mixing device proposed by the present invention;

[0041] Figure 2 This is a schematic diagram of the overall structure of a degradable bio-based polyol / polyacid mixing device proposed by the present invention;

[0042] Figure 3 This is a schematic diagram of the structure of a heating device for a degradable bio-based polyol / polyacid mixing device proposed by the present invention;

[0043] Figure 4 A mixing device for degradable bio-based polyol / polyacid proposed by the present invention Figure 3 A magnified schematic diagram of point A;

[0044] Figure 5 This is a schematic diagram of the sliding frame structure of a degradable bio-based polyol / polyacid mixing device proposed by the present invention;

[0045] Figure 6 This is a schematic diagram of the structure of a collecting box of a mixing device for degradable bio-based polyol / polyacid proposed by the present invention;

[0046] Figure 7 This is a schematic structural diagram of a mixing device of a degradable bio-based polyol / polyacid mixing device proposed by the present invention;

[0047] Figure 8 This is a schematic diagram of the structure of a stirring assembly of a degradable bio-based polyol / polyacid mixing device proposed by the present invention;

[0048] Fig. 9 This is a schematic diagram of the grab structure of a degradable bio-based polyol / polyacid mixing device proposed in the present invention.

[0049] In the figure: 1. tank body; 2. motor; 3. rotating shaft; 31. stabilizing bar; 4. feed pipe; 5. discharge pipe; 6. heating device; 61. air outlet bin; 62. air inlet bin; 63. air outlet pipe; 64. air inlet pipe; 65. circulation pipe; 66. ventilation pipe; 67. fixing ring; 68. sliding frame; 69. annular chute; 610. filter screen; 611. cleaning sheet; 612. central axis; 613. fan blade; 614. collecting box; 7. material leveling device; 71. buffer cylinder; 72. discharge chute; 73. elastic strip; 74. lever; 8. stirring assembly; 81. rotating frame; 82. blade; 83. stirring wheel; 84. limit rod; 85. reciprocating thread; 86. reciprocating bracket; 87. grab bucket; 88. resistance plate; 89. bending rod. DETAILED DESCRIPTION

[0050] 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.

[0051] Example 1

[0052] See also Figure 1-Figure 5 , a degradable bio-based polyol / polyacid mixing device, comprising:

[0053] A tank body 1 is provided with a motor 2, an output end of the motor 2 is connected to a rotating shaft 3, the rotating shaft 3 is rotatably connected to the bottom of the inner wall of the tank body 1, a stabilizing rod 31 is provided inside the tank body 1, the inner wall of the stabilizing rod 31 is rotatably connected to the rotating shaft 3, a discharge pipe 5 is provided at the bottom of the tank body 1, and a valve is provided on the discharge pipe 5; a heating device 6 is used to heat the reactants, the heating device 6 is provided on the tank body 1, the heating device 6 includes an air outlet bin 61, the air outlet bin 61 is provided at the top of the tank body 1, and the inner side of the air outlet bin 61 is connected to There is an air inlet bin 62, an air outlet bin 61 is connected to an air inlet pipe 63, an air inlet bin 62 is connected to an air inlet pipe 64, a plurality of vent pipes 66 are slidably mounted on the inner walls of the air inlet bin 62 and the air outlet bin 61, a plurality of circulation pipes 65 are respectively connected to the bottoms of the plurality of vent pipes 66, one circulation pipe 65 is connected to two vent pipes 66, when the plurality of vent pipes 66 move upward, the steam inside the air inlet bin 62 is respectively input into the plurality of circulation pipes 65 through the plurality of vent pipes 66 located in the air inlet bin 62, at the same time, The multiple ventilation pipes 66 inside the gas outlet bin 61 will input the steam in the multiple circulation pipes 65 into the gas outlet bin 61, and the gas outlet bin 61 will discharge the steam through the gas outlet pipe 63. When the multiple ventilation pipes 66 move downward, the steam inside the multiple circulation pipes 65 stops flowing, and the multiple circulation pipes 65 transfer the heat of the steam to the reactants through contact with the reactants inside the tank body 1, thereby achieving a heating effect; two fixing rings 67 are connected to the multiple circulation pipes 65, and a sliding frame 68 is slidably installed on the inner wall of the tank body 1, and the rotating shaft An annular inclined groove 69 is provided on 3, and a sliding frame 68 is slidably connected with the annular inclined groove 69 through a ball bearing, and one of the fixed rings 67 is connected to the sliding frame 68. When the rotating shaft 3 rotates, the annular inclined groove 69 is driven to rotate. When the annular inclined groove 69 rotates, the sliding frame 68 is driven to perform vertical reciprocating motion through the ball bearing, and the sliding frame 68 drives one of the fixed rings 67 to perform vertical reciprocating motion. The fixed ring 67 drives multiple circulation pipes 65 to perform vertical reciprocating motion. When the circulation pipe 65 moves, it drives two ventilation pipes 66 to move synchronously.

[0054] For further information, see Figure 6 A collecting box 614 is installed on the air intake pipe 64, and a central shaft 612 is rotatably installed inside the collecting box 614. A fan blade 613 is installed at one end of the central shaft 612, and a cleaning sheet 611 is installed at the other end of the central shaft 612. A filter screen 610 is installed on the inner wall of the collecting box 614, and the filter screen 610 is connected to the air intake pipe 64. The cleaning sheet 611 is in contact with the filter screen 610. When the gas in the air intake pipe 64 flows, the gas in the air intake pipe 64 will drive the fan blade 613 to rotate, and the rotation of the fan blade 613 will drive the central shaft 612 to rotate, and the central shaft 612 will drive the cleaning sheet 611 to rotate. The filter screen 610 can intercept impurities in the air intake pipe 64, and the cleaning sheet 611 can scrape impurities attached to the surface of the filter screen 610 into the collecting box 614 by rotation.

[0055] By setting the heating device 6, the plurality of circulation pipes 65 can exchange the heat of the steam inside them to the reactants in the tank body 1, so as to achieve the heating effect, and the plurality of circulation pipes 65 can increase the contact area with the reactants through vertical reciprocating motion, so as to improve the heating rate, and because the length of each circulation pipe 65 is short and the steam transmission distance is short, the surface temperature of the entire circulation pipe 65 is relatively uniform, so that the heat contacted by the reactants in the tank body 1 is relatively uniform, avoiding the conventional steam heating pipe. Due to the long winding length of the pipe, the surface temperature of the pipe in different sections is uneven, so that the reactants in the tank body 1 are heated unevenly, thereby causing Uneven heating occurs, which affects the subsequent reaction effect. Through the cooperation of the air outlet bin 61, the air inlet bin 62, and the ventilation pipe 66, the steam in the circulation pipe 65 can be discharged intermittently, thereby increasing the residence time and utilization rate of the steam and avoiding the waste of resources caused by long-term uninterrupted steam transportation and circulation; through the setting of the cleaning sheet 611, the filter screen 610, the collection box 614, and the fan blade 613, the filter screen 610 can intercept the impurities carried by the steam in the air inlet pipe 64, and scrape them into the collection box 614 through the rotation of the cleaning sheet 611, thereby avoiding the air inlet pipe 64 After long-term use, it is avoided that the pipe is blocked due to the accumulation of more impurities inside, thereby affecting the use.

[0056] In this embodiment, the material leveling device 7 is used to make the reactants fall evenly into the tank body 1.

[0057] See also Figure 7 The material leveling device 7 is arranged on the tank body 1, and the material leveling device 7 includes a buffer cylinder 71. The buffer cylinder 71 is installed on the top of the tank body 1. Two feed troughs 72 are installed inside the buffer cylinder 71. The two feed troughs 72 are provided with multiple feed holes. The top of the buffer cylinder 71 is connected to multiple feed pipes 4. The reactants are successively added to the tank body 1 through the multiple feed pipes 4. The reactants enter the buffer cylinder 71 through the feed pipes 4. After the reactants in the buffer cylinder 71 are evenly spread out by themselves due to the fluidity of the liquid, they drip into the tank body 1 below through the multiple feed holes on the two feed troughs 72.

[0058] For further information, see Figure 7 A plurality of elastic strips 73 are installed on the inner wall of the buffer cylinder 71, and two levers 74 are installed on the rotating shaft 3. One end of the plurality of elastic strips 73 close to the rotating shaft 3 is located on the movement trajectory of the two levers 74. When the rotating shaft 3 rotates, the rotating shaft 3 drives the two levers 74 to rotate. During the rotation process, the two levers 74 will repeatedly contact the plurality of elastic strips 73 and drive the plurality of elastic strips 73 to vibrate. The plurality of elastic strips 73 can promote the initial fusion of the reactants in the buffer cylinder 71 and promote the falling of the reactants through vibration.

[0059] By setting the material leveling device 7, after the feed pipe 4 adds the reactants into the buffer cylinder 71, the reactants can evenly drip into the tank body 1 through the multiple discharge holes on the two discharge troughs 72, avoiding the reactants from being concentratedly added into the tank body 1, resulting in a low degree of fusion between the reactants in the tank body 1, thereby requiring more stirring and mixing time and reducing work efficiency; by setting the multiple elastic strips 73, the multiple elastic strips 73 can promote the flow and dripping of the reactants through vibration, and when multiple reactants are added at the same time, the elastic strips 73 can promote the initial fusion between the reactants through vibration, reducing the subsequent stirring and mixing time, thereby improving work efficiency.

[0060] In this embodiment, the stirring assembly 8 is used to stir and mix the reactants.

[0061] See also Figure 8-Figure 9 The stirring assembly 8 is arranged inside the tank body 1, and the stirring assembly 8 includes a rotating frame 81, which is mounted on the rotating shaft 3. A plurality of blades 82 are mounted on the rotating frame 81. When the rotating frame 81 rotates, the plurality of blades 82 are driven to rotate. The plurality of blades 82 stir and mix the reactants inside the tank body 1 by rotating. A stirring wheel 83 is mounted on the rotating shaft 3. The stirring wheel 83 is located at the bottom of the tank body 1. When the rotating shaft 3 rotates, the stirring wheel 83 is also driven to rotate. The stirring wheel 83 stirs the reactants at the bottom of the tank body 1 by rotating.

[0062] Further, see Figure 8-Figure 9Two limit rods 84 are installed at the bottom of the stabilizing rod 31, and the bottom ends of the two limit rods 84 are connected to the tank body 1. Reciprocating brackets 86 are slidably installed on the two limit rods 84. A reciprocating thread 85 is provided on the rotating shaft 3. The reciprocating bracket 86 is slidably connected to the reciprocating thread 85 through a ball. Four grab buckets 87 are hinged on the reciprocating bracket 86. When the rotating shaft 3 rotates, the reciprocating bracket 86 is driven to perform vertical reciprocating motion on the two limit rods 84 through the cooperation of the reciprocating thread 85 and the ball. When the reciprocating bracket 86 moves, it drives the four grab buckets 87 to move. Every two grab buckets 87 form a group. A resistance plate 88 is hinged on the grab bucket 87, and a bent rod 89 is connected to the resistance plate 88. When the two grab buckets 87 move downward in the reactant, due to the resistance of the liquid, the reactant pushes the resistance plate 88 on the grab bucket 87 upward. When the resistance plate 88 moves upward, a gap will be opened between the resistance plate 88 and the grab bucket 87, and the resistance plate 88 will drive the bent rod 89 to move. When the bent rod 89 moves to contact the inner wall of the grab bucket 87, the resistance plate 88 drives the grab bucket 87 to flip upward through the bent rod 89, so that the two grab buckets 87 in the same group are in an open state. When the grab bucket 87 moves upward, the reactants drive the two grab buckets 87 in the same group to close through the resistance plate 88, so that one group of grab buckets 87 will grab the reactants at the bottom of the tank body 1 inside and transport them upward when moving upward. When the grab bucket 87 starts to move downward, the two grab buckets 87 open and release the reactants inside them through the opening between the grab bucket 87 and the resistance plate 88, so that the reactants at the bottom of the tank body 1 can be continuously transported to the top of the tank body 1.

[0063] By setting the stirring assembly 8, the multiple blades 82 on the rotating frame 81 can stir and mix the reactants inside the tank body 1 at multiple angles, and the reactants at the bottom of the tank body 1 are continuously stirred by the rotation of the stirring wheel 83 to avoid sedimentation of the reactants at the bottom of the tank body 1, thereby affecting the mixing effect; by the cooperation of the grab bucket 87 and the resistance plate 88, the two groups of grab buckets 87 can continuously grab the reactants at the bottom of the tank body 1 and transport them to the liquid level position above the tank body 1, further promoting the mixing of different reactants, avoiding stratification due to the different masses of different reactants, making the stirring and mixing effect of reactants in different height intervals uneven, thereby affecting the subsequent reaction effect.

[0064] Example 2

[0065] A method for degrading bio-based polyols / polyacids, comprising any one of the above-mentioned mixing devices for degrading bio-based polyols / polyacids, further comprising the following steps:

[0066] Step 1: Raw material preparation, removing impurities from vegetable oil such as soybean oil through a refining process, and using the vegetable oil after impurities are removed as raw material;

[0067] Step 2: Preparation of epoxidized vegetable oil, by using a catalyst and an epoxidizing agent to convert the vegetable oil into epoxidized vegetable oil;

[0068] Step 3: Add the epoxidized vegetable oil and the catalyst into the tank body 1, evacuate the air inside the tank body 1 to a vacuum state, and fill it with nitrogen to a normal pressure state;

[0069] Step 4: The vegetable oil and catalyst in the tank body 1 are heated to 150 degrees Celsius by the heating device 6;

[0070] Step 5: The vegetable oil and the catalyst in the tank body 1 are stirred and mixed by the stirring assembly 8, and the temperature of the vegetable oil in the tank body 1 is reduced to 50 degrees Celsius after the reaction is completed;

[0071] Step 6: Use tartaric acid ester to carry out the first ring-opening reaction of the epoxy group;

[0072] Step 7: using a second ring-opening reagent containing a secondary alcohol to carry out a second ring-opening reaction;

[0073] Step 8: Use primary alcohol to perform a third ring-opening reaction on the remaining epoxy groups;

[0074] Step 9: The reaction liquid is decompressed and enters a flash tank for rapid boiling and vaporization, and two-phase separation is performed. After the vaporization is completed, part of the methanol is recovered, and the excess methanol is further evaporated at 100 degrees Celsius by a film evaporator;

[0075] Step 10: The recovered methanol is distilled and recovered by a distillation device to recover high-purity methanol for reuse;

[0076] Step 11: The material produced in the previous step is decolorized by activated clay and then filtered to obtain bio-based polyols. The excess water in the product is then evaporated and the water content is controlled;

[0077] Step 12: Use methanol to wash, wash off the adsorbed materials and catalysts and enter the intermediate tank, and then return to the first step reaction. Use a dryer to dry the white clay, and the methanol evaporated during the drying process is recovered by condensation.

[0078] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0079] Working principle: start the motor 2, the motor 2 drives the shaft 3 to rotate, the staff adds the reactants into the tank body 1 through multiple feeding pipes 4, the reactants enter the buffer cylinder 71 through the feeding pipe 4, the reactants in the buffer cylinder 71 are evenly spread out by the fluidity of the liquid, and then drip into the tank body 1 below through multiple discharge holes on the two discharge troughs 72. When the shaft 3 rotates, the shaft 3 drives the two levers 74 to rotate. During the rotation process, the two levers 74 will repeatedly contact the multiple elastic strips 73 and drive the multiple elastic strips 73 to vibrate. The multiple elastic strips 73 can promote the initial fusion of the reactants in the buffer cylinder 71 through vibration, and promote the discharge of the reactants. falling; through the setting of the material leveling device 7, after the feed pipe 4 adds the reactant into the buffer cylinder 71, the reactant can evenly drip into the tank body 1 through the multiple discharge holes on the two discharge troughs 72, avoiding the reactant from being concentratedly added into the tank body 1, resulting in a low degree of fusion between the reactants in the tank body 1, thereby requiring more stirring and mixing time and reducing work efficiency; through the setting of the multiple elastic strips 73, the multiple elastic strips 73 can promote the flow and dripping of the reactant through vibration, and when multiple reactants are added at the same time, the elastic strips 73 can promote the initial fusion between the reactants through vibration, reducing the subsequent stirring and mixing time, thereby improving work efficiency.

[0080] When it is necessary to heat the reactants in the tank body 1 with steam, the steam enters the air inlet bin 62 through the air inlet pipe 64. The rotating shaft 3 drives the annular chute 69 to rotate when rotating. When the annular chute 69 rotates, the sliding frame 68 is driven by the ball bearing to perform vertical reciprocating motion. The sliding frame 68 drives one of the fixed rings 67 to perform vertical reciprocating motion. The fixed ring 67 drives multiple circulation pipes 65 to perform vertical reciprocating motion. When the circulation pipe 65 moves, it drives the two ventilation pipes 66 to move synchronously. When the multiple ventilation pipes 66 move upward, the steam inside the air inlet bin 62 is respectively input into the multiple circulation pipes 65 through the multiple ventilation pipes 66 located in the air inlet bin 62. At the same time, the multiple ventilation pipes 66 located in the air outlet bin 61 will transfer the multiple The steam in the circulation pipes 65 is input into the air outlet bin 61, and the air outlet bin 61 discharges the steam through the air outlet pipe 63. When the multiple ventilation pipes 66 move downward, the steam inside the multiple circulation pipes 65 stops flowing, and the multiple circulation pipes 65 transfer the heat of the steam to the reactants through contact with the reactants inside the tank body 1, thereby achieving a heating effect; when the gas in the air inlet pipe 64 is flowing, the gas in the air inlet pipe 64 will drive the fan blades 613 to rotate, and the rotation of the fan blades 613 will drive the central shaft 612 to rotate, and the central shaft 612 will drive the cleaning sheet 611 to rotate, and the filter screen 610 can intercept impurities in the air inlet pipe 64, and the cleaning sheet 611 can scrape the impurities attached to the surface of the filter screen 610 into the collection box by rotating. In 614, the staff regularly cleans the impurities in the collection box 614; through the setting of the heating device 6, the multiple circulation pipes 65 can exchange the heat of the internal steam to the reactants in the tank body 1, so as to achieve the heating effect, and the multiple circulation pipes 65 can increase the contact area with the reactants through vertical reciprocating motion, thereby improving the heating rate, and because the length of each circulation pipe 65 is short and the steam transmission distance is short, the surface temperature of the entire circulation pipe 65 is relatively uniform, so that the heat contacted by the reactants in the tank body 1 is relatively uniform, avoiding the conventional steam heating pipe due to the long winding length of the pipe, resulting in uneven surface temperatures of different sections of the pipe, so that the tank body 1 The reactants are heated unevenly, resulting in uneven heating, which affects the subsequent reaction effect. Through the cooperation of the air outlet bin 61, the air inlet bin 62, and the vent pipe 66, the steam in the circulation pipe 65 can be discharged intermittently, thereby increasing the residence time and utilization rate of the steam and avoiding the waste of resources caused by long-term uninterrupted steam transportation and circulation; through the arrangement of the cleaning sheet 611, the filter screen 610, the collection box 614, and the fan blades 613, the filter screen 610 can intercept the impurities carried by the steam in the air inlet pipe 64, and scrape them into the collection box 614 through the rotation of the cleaning sheet 611, thereby avoiding the air inlet pipe 64 After long-term use, it is avoided that the pipe is blocked due to the accumulation of more impurities inside, thereby affecting the use.

[0081] When multiple reactants need to be stirred and mixed, the rotating shaft 3 drives the rotating frame 81 to rotate, and the stabilizing rod 31 plays the role of stabilizing the rotating shaft 3. When the rotating frame 81 rotates, it drives the multiple blades 82 to rotate. The multiple blades 82 stir and mix the reactants inside the tank body 1 by rotating. When the rotating shaft 3 rotates, it also drives the stirring wheel 83 to rotate. The stirring wheel 83 stirs the reactants at the bottom of the tank body 1 by rotating; when the rotating shaft 3 rotates, the reciprocating bracket 86 is driven to perform vertical reciprocating motion on the two limit rods 84 through the cooperation of the reciprocating thread 85 and the ball, and the reciprocating bracket 86 drives four grab buckets when it moves. 87 movement, two grab buckets 87 form a group, when the two grab buckets 87 move downward in the reactant, due to the resistance of the liquid, the reactant pushes the resistance plate 88 on the grab bucket 87 upward, and when the resistance plate 88 moves upward, a gap is opened between the resistance plate 88 and the grab bucket 87, and at the same time, the resistance plate 88 drives the bent rod 89 to move. When the bent rod 89 moves to contact the inner wall of the grab bucket 87, the resistance plate 88 drives the grab bucket 87 to flip upward through the bent rod 89, so that the two grab buckets 87 in the same group are in an open state. When the grab bucket 87 moves upward, the reactant drives the two grab buckets in the same group through the resistance plate 88 The grab buckets 87 are closed, so that when a group of grab buckets 87 moves upward, they will grab the reactants at the bottom of the tank body 1 and transport them upward. When the grab buckets 87 start to move downward, the two grab buckets 87 are opened and the reactants inside are released through the openings between the grab buckets 87 and the resistance plate 88, so that the reactants at the bottom of the tank body 1 can be continuously transported to the top of the tank body 1. After the mixing is completed, the valve on the discharge pipe 5 is opened to allow the reactants to be transported to the next process through the discharge pipe 5. Through the setting of the stirring assembly 8, the multiple blades 82 on the rotating frame 81 can be moved at multiple angles. The reactants inside the tank body 1 are stirred and mixed, and the reactants at the bottom of the tank body 1 are continuously stirred by the rotation of the stirring wheel 83 to avoid sedimentation of the reactants at the bottom of the tank body 1, thereby affecting the mixing effect; through the cooperation of the grab bucket 87 and the resistance plate 88, the two groups of grab buckets 87 can continuously grab the reactants at the bottom of the tank body 1 and transport them to the liquid level position above the tank body 1, further promoting the mixing of different reactants, avoiding stratification due to the different masses of different reactants, making the stirring and mixing effect of reactants in different height intervals uneven, thereby affecting the subsequent reaction effect.

[0082] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A mixing device for biodegradable bio-based polyols / polyacids, It is characterized in that include: Tank body (1); A heating device (6) for heating the reactants; A material mixing device (7) for making the reactants fall evenly into the tank (1); A stirring assembly (8), used for stirring and mixing the reactants; The tank body (1) is provided with a motor (2), the output end of the motor (2) is connected to a rotating shaft (3), the rotating shaft (3) is rotatably connected to the bottom of the inner wall of the tank body (1), a stabilizing rod (31) is installed inside the tank body (1), the inner wall of the stabilizing rod (31) is rotatably connected to the rotating shaft (3), a discharge pipe (5) is installed at the bottom of the tank body (1), a valve is provided on the discharge pipe (5), the heating device (6) is provided on the tank body (1), the material mixing device (7) is provided on the tank body (1), and the stirring assembly (8) is provided at the bottom of the tank body (1). Internally, the heating device (6) comprises an air outlet bin (61), the air outlet bin (61) is installed on the top of the tank body (1), the inner side of the air outlet bin (61) is connected to an air inlet bin (62), the air outlet bin (61) is connected to an air outlet pipe (63), the air inlet bin (62) is connected to an air inlet pipe (64), a plurality of ventilation pipes (66) are slidably installed on the inner walls of the air inlet bin (62) and the air outlet bin (61), the bottoms of the plurality of ventilation pipes (66) are respectively connected to a plurality of circulation pipes (65), and one circulation pipe (65) is connected to two ventilation pipes (66).

2. A degradable bio-based polyol / polyacid mixing device according to claim 1, Features: Two fixing rings (67) are connected to the plurality of circulation pipes (65), a sliding frame (68) is slidably mounted on the inner wall of the tank body (1), and an annular inclined groove (69) is provided on the rotating shaft (3).

3. A degradable bio-based polyol / polyacid mixing device according to claim 2, Features: The sliding frame (68) is slidably connected to the annular inclined groove (69) via balls, and a fixing ring (67) is connected to the sliding frame (68).

4. A degradable bio-based polyol / polyacid mixing device according to claim 3, Features: A collection box (614) is installed on the air intake pipe (64), a central shaft (612) is rotatably installed inside the collection box (614), a fan blade (613) is installed at one end of the central shaft (612), a cleaning sheet (611) is installed at the other end of the central shaft (612), a filter screen (610) is installed on the inner wall of the collection box (614), the filter screen (610) is connected to the air intake pipe (64), and the cleaning sheet (611) is in contact with the filter screen (610).

5. A degradable bio-based polyol / polyacid mixing device according to claim 4, Features: The material leveling device (7) comprises a buffer cylinder (71), wherein the buffer cylinder (71) is installed on the top of the tank body (1), two material discharge troughs (72) are installed inside the buffer cylinder (71), and a plurality of material discharge holes are opened on the two material discharge troughs (72), and a plurality of feed pipes (4) are connected to the top of the buffer cylinder (71).

6. A degradable bio-based polyol / polyacid mixing device according to claim 5, Features: The inner wall of the buffer cylinder (71) is provided with a plurality of elastic strips (73), and two shifting rods (74) are provided on the rotating shaft (3). One end of the plurality of elastic strips (73) close to the rotating shaft (3) is located on the movement track of the two shifting rods (74).

7. A degradable bio-based polyol / polyacid mixing device according to claim 6, Features: The stirring assembly (8) comprises a rotating frame (81), the rotating frame (81) is mounted on a rotating shaft (3), a plurality of blades (82) are mounted on the rotating frame (81), a stirring wheel (83) is mounted on the rotating shaft (3), and the stirring wheel (83) is located at the bottom of the tank body (1).

8. A degradable bio-based polyol / polyacid mixing device according to claim 7, Features: Two limiting rods (84) are installed at the bottom of the stabilizing rod (31), the bottom ends of the two limiting rods (84) are connected to the tank body (1), and reciprocating brackets (86) are slidably installed on the two limiting rods (84). A reciprocating thread (85) is provided on the rotating shaft (3), and the reciprocating bracket (86) is slidably connected to the reciprocating thread (85) via a ball.

9. A degradable bio-based polyol / polyacid mixing device according to claim 8, Features: Four grab buckets (87) are hinged on the reciprocating bracket (86), and every two grab buckets (87) form a group. A resistance plate (88) is hinged on the grab bucket (87), and a bent rod (89) is connected to the resistance plate (88).

10. A method for degrading bio-based polyols / polyacids, Features: A mixing device comprising any one of the above-mentioned biodegradable bio-based polyols / polyacids, further comprising the following steps: Step 1: Raw material preparation, removing impurities from vegetable oil (such as soybean oil) through a refining process, and using the vegetable oil after impurities are removed as raw material; Step 2: Preparation of epoxidized vegetable oil, by using a catalyst and an epoxidizing agent to convert the vegetable oil into epoxidized vegetable oil; Step 3: adding the epoxidized vegetable oil and the catalyst into the tank body (1), evacuating the air inside the tank body (1) to a vacuum state, and filling the tank body (1) with nitrogen to a normal pressure state; Step 4: heating the vegetable oil and catalyst in the tank (1) to 150 degrees Celsius by means of a heating device (6); Step 5: stirring and mixing the vegetable oil and the catalyst in the tank body (1) by means of a stirring assembly (8), and reducing the temperature of the vegetable oil in the tank body (1) to 50 degrees Celsius after the reaction is completed; Step 6: Use tartaric acid ester to carry out the first ring-opening reaction of the epoxy group; Step 7: using a second ring-opening reagent containing a secondary alcohol to carry out a second ring-opening reaction; Step 8: Use primary alcohol to perform a third ring-opening reaction on the remaining epoxy groups; Step 9: The reaction liquid is decompressed and enters a flash tank for rapid boiling and vaporization, and two-phase separation is performed. After the vaporization is completed, part of the methanol is recovered, and the excess methanol is further evaporated at 100 degrees Celsius by a film evaporator; Step 10: The recovered methanol is distilled and recovered by a distillation device to recover high-purity methanol for reuse; Step 11: The material produced in the previous step is decolorized by activated clay and then filtered to obtain bio-based polyols. The excess water in the product is then evaporated and the water content is controlled; Step 12: Use methanol to wash, wash off the adsorbed materials and catalysts and enter the intermediate tank, and then return to the first step reaction. Use a dryer to dry the white clay, and the methanol evaporated during the drying process is recovered by condensation.

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