Continuous production device and process of isooctyl stearate

Abstract

The invention provides a continuous production device and process of isooctyl stearate, and relates to the technical field of isooctyl stearate processing.The continuous production device comprises a reactor tank, a spiral coil is installed in the reactor tank, the two ends of the spiral coil penetrate out of the reactor tank, a partition plate is installed in the spiral coil, and the partition plate is connected with the spiral coil through a pipeline. The partition plate can divide the interior of the spiral coil into a first reaction channel and a second reaction channel. According to the continuous production device and process for isooctyl stearate, through the arrangement of the reactor tank body, the spiral coil pipe, the partition plate, the blocking structure, the temperature control driving mechanism and the guiding mechanism, two reaction channels can be used for carrying out esterification reaction at the same time, the production efficiency and productivity are improved, and when the temperature difference occurs in the two reaction channels, the continuous production of isooctyl stearate is achieved. According to the technical scheme, reactants in the two reaction channels can be intersected and mixed with each other, so that the movement of the reactants is increased, the collision among molecules is improved, the reaction efficiency is ensured, the concentration of isooctyl stearate in a product can be ensured, and the fraction purity is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of isooctyl stearate processing, and particularly relates to a continuous production device and process for isooctyl stearate. Background Art

[0002] Isooctyl stearate, also known as 2-ethylhexyl stearate and isooctyl octadecanoate, is a colorless to light yellow transparent oily liquid. It has the characteristics of being not easily oxidized, not discoloring, non-toxic, non-irritating, non-sensitizing, and having good stability. It has good skin compatibility, and has good thixotropy, spreading property, fluidity and slipperiness at skin temperature, and has the functions of resisting enzyme decomposition and oxidation. Isooctyl stearate is soluble in acetone, castor oil, corn oil, chloroform, ethanol and mineral oil, and insoluble in water, glycerol and propylene glycol; Isooctyl stearate is widely used in the cosmetic field as a solvent for cosmetic components such as pigments, vitamins, preservatives, etc., and is commonly used in products such as creams, sunscreens, massage oils, etc. In addition, it can also be used as an oil additive, a synthetic fiber finishing agent, and a plasticizer and lubricant for plastics.

[0003] When producing isooctyl stearate, usually stearic acid, isooctanol and a catalyst are used as raw materials. The stearic acid and isooctanol are mixed in a certain proportion, and the catalyst is added to ensure that the raw materials are fully and evenly mixed. Then the evenly mixed material is sent into a spiral coil reactor for esterification reaction. During the reaction process, conditions such as temperature, pressure and reaction time need to be strictly controlled to ensure the full progress of the reaction and the stability of the product quality. After removing unreacted raw materials and by-products through methods such as distillation, a pure isooctyl stearate product is obtained; when the raw materials are reacting, usually the esterification reaction is carried out in a spiral coil reactor. Now most of the spiral coil reactors have only one coil, and the reaction rate of one coil is limited, which may affect the yield of isooctyl stearate. Summary of the Invention

[0004] Based on the technical problems existing in the background art, the present invention proposes a continuous production device and process for isooctyl stearate.

[0005] A continuous production device for isooctyl stearate proposed by the present invention includes a reactor tank body, a spiral coil is installed in the reactor tank body, both ends of the spiral coil penetrate through the reactor tank body, and a partition is installed in the spiral coil. The partition can divide the inside of the spiral coil into a first reaction channel and a second reaction channel; A communication port capable of communicating with the first reaction channel and the second reaction channel is provided on the partition plate. A blocking structure is installed on the partition plate, and the blocking structure can block the communication port. A temperature control driving mechanism is installed on the partition plate. When there is a temperature difference between the reactants in the first reaction channel and the second reaction channel, the temperature control driving mechanism can control the blocking structure to open and close the communication port. A guiding mechanism is also installed on the partition plate. When there is a temperature difference between the reactants in the first reaction channel and the second reaction channel, the guiding mechanism can guide the reactants in the first reaction channel and the second reaction channel to flow through each other.

[0006] Preferably, the blocking structure includes a blocking member; the blocking member includes two sealing plates and a connecting block. The two sealing plates are arranged in parallel, and the two sealing plates are respectively fixedly connected to both sides of the connecting block. The connecting block is slidably installed in the communication port, and the two sealing plates can respectively block the two ends of the communication port.

[0007] Preferably, the temperature control driving mechanism includes a traction rod, a first temperature sensing block, a first heat preservation box, a first heat conducting rod, and a temperature sensing driving component; the first heat preservation box is fixedly installed in the partition plate. One end of the traction rod is fixedly connected to the connecting block of the blocking member. A movement groove slidably matched with the traction rod is provided in the partition plate. The end of the traction rod away from the connecting block passes through the first heat preservation box and extends into the interior of the first heat preservation box. The number of the first temperature sensing blocks is two, and the two first temperature sensing blocks are respectively fixedly installed on the inner walls of the first reaction channel and the second reaction channel. The number of the first heat conducting rods is two, and the two first heat conducting rods are arranged in one-to-one correspondence with the two first temperature sensing blocks. One end of the first heat conducting rod is fixedly connected to the first temperature sensing block, and the end of the first heat conducting rod away from the first temperature sensing block extends into the first heat preservation box; There are two temperature sensing driving components, and the two temperature sensing driving components are arranged in one-to-one correspondence with the two first heat conducting rods. The temperature sensing driving component can drive the traction rod to slide in the movement groove.

[0008] Preferably, the temperature sensing driving component includes a first elastic memory metal sheet and a heat insulation block; one end of the first elastic memory metal sheet is fixedly connected to the end of the first heat conducting rod away from the first temperature sensing block. The heat insulation block is fixedly connected to the end of the first elastic memory metal sheet away from the first heat conducting rod. A sliding groove is provided on the heat insulation block. A sliding shaft is fixedly connected to the traction rod, and the sliding shaft is slidably installed in the sliding groove.

[0009] Preferably, the guiding mechanism includes a guiding plate and a temperature difference driving component; one inner wall of the communication port is an inclined surface, and the guiding plate is slidably arranged on the inclined inner wall of the communication port; The temperature difference driving component is used to drive the guiding plate to slide on the inclined inner wall of the communication port.

[0010] Preferably, the temperature difference driving component includes two second temperature sensing blocks, two second heat conducting rods, two second elastic memory metal sheets, a second heat preservation box, a slider and a connecting slider; the two second temperature sensing blocks are respectively fixedly installed on the inner walls of the first reaction channel and the second reaction channel, the two second heat conducting rods are respectively arranged corresponding to the two second temperature sensing blocks, one end of the second heat conducting rod is fixedly connected with the second temperature sensing block, the second heat preservation box is fixedly installed in the partition board, the end of the second heat conducting rod far away from the second temperature sensing block is located in the second heat preservation box, the two second elastic memory metal sheets are respectively arranged corresponding to the two second heat conducting rods, one end of the second elastic memory metal sheet is fixedly connected with the end of the second heat conducting rod far away from the second temperature sensing block, the ends of the two second elastic memory metal sheets far away from the second heat conducting rods are respectively connected to both sides of the slider, the slider is slidably installed in the second heat preservation box, both ends of the connecting slider are respectively fixedly connected with the slider and the guiding plate, and a limiting movement groove which is in sliding fit with the connecting slider is clamped in the partition board.

[0011] Preferably, a liquid inlet pipe and a liquid discharge pipe are installed on the reactor tank body, the liquid inlet pipe is located at the top of the reactor tank body, and the liquid discharge pipe is located on the outer periphery of the reactor tank body.

[0012] A continuous production process of isooctyl stearate is as follows: Step 1: Raw material preparation and feeding, mixing stearic acid, isooctanol and a catalyst in proportion; Step 2: Esterification reaction, pumping the mixed raw materials into the spiral coil of the spiral coil reactor by the pump; Step 3: Separation and purification, after the reaction is completed, removing the unreacted raw materials and by-products by distillation.

[0013] Preferably, in Step 1, the catalyst is an acidic ionic liquid; The molar ratio of stearic acid to isooctanol is 1:1.4, and the molar ratio of the catalyst to stearic acid is 1:25.

[0014] Preferably, in Step 2, the esterification reaction temperature is 140 - 160 °C, and the reaction time is 5 - 7 h.

[0015] The continuous production device and process of isooctyl stearate proposed by the present invention have the following beneficial effects: by setting the reactor tank body, spiral coil, partition board, plugging structure, temperature control driving mechanism and guiding mechanism, the esterification reaction can be carried out simultaneously in two reaction channels, improving the production efficiency and capacity. When there is a temperature difference in the two reaction channels, the reactants in the two reaction channels can intersect and mix with each other, increasing the movement of the reactants, improving the collision between molecules, ensuring the reaction efficiency, and at the same time ensuring the concentration of isooctyl stearate in the product and the purity of the fraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 1 is a schematic view of the overall structure of a continuous production device for isooctyl stearate proposed by the present invention.

[0017] Figure 2 FIG. 2 is a cross-sectional view of a continuous production device for isooctyl stearate proposed by the present invention.

[0018] Figure 3 FIG. 3 is a partial cross-sectional view of a spiral coiled pipe in a continuous production device for isooctyl stearate proposed by the present invention.

[0019] Figure 4 FIG. 4 is a schematic view of a continuous production device for isooctyl stearate proposed by the present invention Figure 3 and an enlarged view of part A in FIG. 4.

[0020] Figure 5 FIG. 5 is a schematic view of the structure of a plugging member and a traction rod in a continuous production device for isooctyl stearate proposed by the present invention.

[0021] Figure 6 FIG. 6 is a schematic view of the structure of a first temperature sensing block, a first heat conducting rod, a first elastic memory metal sheet and a heat insulating block in a continuous production device for isooctyl stearate proposed by the present invention.

[0022] Figure 7 FIG. 7 is a schematic view of the structure of a temperature difference driving assembly in a continuous production device for isooctyl stearate proposed by the present invention.

[0023] In the figures: 1, reactor tank body; 2, spiral coiled pipe; 3, partition board; 4, first reaction channel; 5, second reaction channel; 6, plugging member; 7, traction rod; 8, first temperature sensing block; 9, first heat preservation box; 10, first heat conducting rod; 11, first elastic memory metal sheet; 12, heat insulating block; 13, sliding shaft; 14, guiding plate; 15, second temperature sensing block; 16, second heat conducting rod; 17, second elastic memory metal sheet; 18, second heat preservation box; 19, sliding block; 20, connecting sliding block; 21, liquid inlet pipe; 22, liquid discharge pipe. DETAILED DESCRIPTION OF THE INVENTION

[0024] Referring to Figures 1 - 7, the present invention provides a continuous production device for isooctyl stearate, which includes a reactor tank body 1. A spiral coil 2 is installed inside the reactor tank body 1. Both ends of the spiral coil 2 penetrate out of the reactor tank body 1. A partition plate 3 is installed inside the spiral coil 2. The partition plate 3 can divide the inside of the spiral coil 2 into a first reaction channel 4 and a second reaction channel 5. In actual situations, multiple channels can be designed to increase the production of isooctyl stearate. However, there may be temperature differences in the mixtures in the two reaction channels (the first reaction channel 4 and the second reaction channel 5). The factors causing temperature differences include flow rate differences. The fluid velocities in the two reaction channels are different (the factors causing different fluid velocities in the reaction channels are: unreasonable design of the feeding system, such as asymmetric branches of the feeding pipeline, inconsistent pipe diameters, or inaccurate valve regulation, etc., which may lead to uneven flow rate distribution when the fluid enters the two spiral tubes, thus causing flow rate differences), and pipeline resistance differences. The number, type, or installation position of local resistance elements, such as elbows, valves, filters, etc., in the two reaction channels are different, which will cause different flow resistances of the fluid in the tubes, thus causing flow rate differences. There are also differences in the inner wall roughness of the reaction channels. Different inner wall roughnesses of the two reaction channels will also affect the fluid flow.For pipelines with relatively rough pipe walls, the fluid flow resistance is large, the flow velocity is relatively slow, which in turn affects the heat exchange efficiency and temperature change. When there is a temperature difference in the two reaction channels, it may lead to a slowdown in the reaction rate and affect the purity of the isooctyl stearate product. When distilling a mixture of isooctyl stearate at two different concentrations, there will be a difference in its average boiling point (the boiling point of the mixture is affected by the concentration and physical properties of each component and may be higher or lower than the boiling point of a single concentration, which needs to be redetermined. When distilling isooctyl stearate with a mixed concentration, due to the change in boiling point, the initial distillate contains low-boiling components and the subsequent distillate contains high-boiling components, and it needs to be collected and processed in sections to ensure the purity of the distillate). When distilling isooctyl stearate with a mixed concentration, the evaporation rates of each component are different, resulting in uneven distillation rates. The low-boiling components are distilled quickly first, and the high-boiling components are distilled slowly later. Therefore, it is necessary to ensure that the isooctyl stearate in the two reaction channels can maintain a consistent reaction rate, so as to ensure the concentration of the final isooctyl stearate product, and then perform distillation treatment on it. Therefore, there is the following design. When there is a temperature difference in the two reaction channels, the interaction and mixing of the reactants in the two reaction channels are increased, so as to ensure the consistency of the concentration of the final reaction product, which is conducive to maintaining the stability of the distillation process and the consistency of the product quality. A communication port that can connect the first reaction channel 4 and the second reaction channel 5 is opened on the partition plate 3. A sealing structure is installed on the partition plate 3. The material of the partition plate 3 is an insulating material, such as plastic. The sealing structure can seal the communication port. A temperature control driving mechanism is installed on the partition plate 3. When there is a temperature difference between the reactants in the first reaction channel 4 and the second reaction channel 5, the temperature control driving mechanism can control the opening and closing of the communication port by the sealing structure. When carrying out the esterification reaction, when the temperature difference in the two reaction channels exceeds the set range, the temperature control driving mechanism senses the temperature difference in the two reaction channels and drives the sealing structure to open the communication port, so that the reactants in the two reaction channels can intersect and mix with each other through the communication port, making the reactants mix and the temperature interact. At the same time, the movement of molecules is increased, the number of molecular collisions is increased, the reaction rate is increased, the reaction efficiency is improved, and the unity of the concentration of the final reactants can be ensured. In addition, when the communication port is opened, the reactants in the two reaction channels flow through the communication port freely under the drive of the natural pressure difference or concentration gradient. A guiding mechanism is also installed on the partition plate 3. When there is a temperature difference between the reactants in the first reaction channel 4 and the second reaction channel 5, the guiding mechanism can guide the reactants in the first reaction channel 4 and the second reaction channel 5 to flow through each other. By guiding the flow of the reactants by the guiding mechanism, the backmixing of the reactants at the communication port can be reduced, ensuring that the reactants flow along the predetermined path, improving the stability and interaction of the reaction, so that the temperature transfer is better. In addition, the reactants in the two reaction channels are mixed more evenly, making the reaction effect better, making the concentration of the final product consistent, and at the same time improving the reaction efficiency.

[0025] Such as Figure 3 、Figure 4 and Figure 5 As shown in Figure 5 , the plugging structure includes a plugging member 6; the plugging member 6 includes two sealing plates and a connecting block. The two sealing plates are arranged in parallel, and the two sealing plates are respectively fixedly connected to both sides of the connecting block. The connecting block is slidably installed in the communication port. The two sealing plates can respectively plug the two ends of the communication port. Matching sliding grooves for sliding cooperation with the sealing plates are provided on both sides of the partition plate 3. The thickness of the sealing plate is the same as the depth of the matching sliding groove. The connecting block is connected to the two sealing plates, and the two sealing plates and the connecting block form a plane. The plane of the plugging member 6 can abut against the inner wall of the communication port, so as to realize the plugging of the communication port.

[0026] As Figure 3 , Figure 4 and Figure 5 As shown in Figure 3 , Figure 4 , and Figure 5 , the temperature control driving mechanism includes a traction rod 7, a first temperature sensing block 8, a first heat preservation box 9, a first heat conducting rod 10, and a temperature sensing driving component; the first heat preservation box 9 is fixedly installed in the partition plate 3. The first heat preservation box 9 can play a certain heat insulation effect, reducing the influence of the temperature sensing driving component in the first heat preservation box 9 by the outside world. One end of the traction rod 7 is fixedly connected to the connecting block of the plugging member 6. A movement groove for sliding cooperation with the traction rod 7 is provided in the partition plate 3 to limit the sliding of the traction rod 7, so as to ensure the movement direction of the plugging member 6. The end of the traction rod 7 away from the connecting block passes through the first heat preservation box 9 and extends into the interior of the first heat preservation box 9. The number of the first temperature sensing blocks 8 is two. The two first temperature sensing blocks 8 are respectively fixedly installed on the inner walls of the first reaction channel 4 and the second reaction channel 5 (both sides of the partition plate 3). The two first temperature sensing blocks 8 are respectively affected by the temperatures of the reactants in the two reaction channels. The number of the first heat conducting rods 10 is two, and the two first heat conducting rods 10 are arranged in one-to-one correspondence with the two first temperature sensing blocks 8. One end of the first heat conducting rod 10 is fixedly connected to the first temperature sensing block 8, and the end of the first heat conducting rod 10 away from the first temperature sensing block 8 extends into the first heat preservation box 9. The number of the temperature sensing driving components is two, and the two temperature sensing driving components are arranged in one-to-one correspondence with the two first heat conducting rods 10. The temperature sensing driving component can drive the traction rod 7 to slide in the movement groove. During actual operation, when there is a temperature difference between the reactants in the two reaction channels, the two first temperature sensing blocks 8 transfer the heat to the two temperature sensing driving components respectively through the two first heat conducting rods 10. Due to the temperature difference received by the two temperature sensing driving components, the traction rod 7 and the plugging member 6 are driven to open the communication port, so as to ensure the mutual intersection and mixing reaction of the reactants in the two reaction channels.

[0027] As Figure 3 , Figure 4 , Figure 5 and Figure 6As shown in the figure, the temperature-sensing driving component includes a first elastic memory metal sheet 11 and a heat insulation block 12; one end of the first elastic memory metal sheet 11 is fixedly connected to one end of the first heat conduction rod 10 away from the first temperature-sensing block 8, and the heat insulation block 12 is fixedly connected to the end of the first elastic memory metal sheet 11 away from the first heat conduction rod 10. A chute is provided on the heat insulation block 12. A sliding shaft 13 is fixedly connected to the traction rod 7, and the sliding shaft 13 is slidably installed in the chute. The first elastic memory metal sheet 11 is wrapped with flexible heat insulation plastic to reduce the influence of the external temperature. The two first elastic memory metal sheets 11 will undergo reversible bending deformation after being heated, but the bending directions of the deformations generated by the two first elastic memory metal sheets 11 when heated are opposite. When the temperatures received by the two first elastic memory metal sheets 11 are the same, the deformation acting forces generated by the two first elastic memory metal sheets 11 when heated cancel each other out, so that the position of the plugging member 6 remains unchanged, and the reactants in the two reaction channels flow and react normally. When there is a temperature difference between the reactants in the two reaction channels, the heat influences received by the two first elastic memory metal sheets 11 are inconsistent, and the elastic deformation amounts generated are inconsistent. The elastic deformation amount of the first elastic memory metal sheet 11 with a higher temperature is greater than that of the other first elastic memory metal sheet 11 (in actual situations, the elastic deformation directions of the first elastic memory metal sheets 11 on the same side of the partition 3 are also different), so that the traction rod 7 undergoes displacement (or the plugging member 6 abuts against the inner wall of the communication port). When the traction rod 7 undergoes displacement, it will drive the plugging member 6 to slide in the communication port, thereby opening the communication port, and the reactants in the two reaction channels can flow, intersect and mix with each other.

[0028] As Figure 3 , Figure 4 and Figure 5 As shown in the figure, the guiding mechanism includes a guiding plate 14 and a temperature difference driving component; one inner wall of the communication port is an inclined surface, the guiding plate 14 is slidably arranged on the inclined inner wall of the communication port, and the temperature difference driving component is used to drive the guiding plate 14 to slide on the inclined inner wall of the communication port. When there is a temperature difference between the reactants in the two reaction channels, the communication port is opened, and the temperature difference driving component senses the change in temperature difference and drives the guiding plate 14 to slide and extend out of the communication port. Assume Figure 3 in the guiding plate 14 at position A in the figure extends into the second reaction channel 5. When the reactants in the second reaction channel 5 flow, they will directly impact on the inclined surface of the guiding plate 14. At this time, the communication port is in an open state, and the reactants in the second reaction channel 5 will flow along the inclined surface of the guiding plate 14 into the first reaction channel 4. At the same time, there is a guiding plate 14 extending into the first reaction channel 4. As in the above example, the reactants in the first reaction channel 4 flow along the inclined surface of the guiding plate 14 into the second reaction channel 5.

[0029] As Figure 3 , Figure 4 and Figure 7As shown in the figure, the temperature difference driving component includes two second temperature sensing blocks 15, two second heat conducting rods 16, two second elastic memory metal sheets 17, a second heat preservation box 18, a slider 19 and a connecting slider 20; the two second temperature sensing blocks 15 are respectively fixedly installed on the inner walls of the first reaction channel 4 and the second reaction channel 5 (on both sides of the partition plate 3), the two second heat conducting rods 16 are respectively arranged corresponding to the two second temperature sensing blocks 15, one end of the second heat conducting rod 16 is fixedly connected with the second temperature sensing block 15, the second heat preservation box 18 is fixedly installed in the partition plate 3, and the end of the second heat conducting rod 16 far from the second temperature sensing block 15 is located in the second heat preservation box 18; the two second elastic memory metal sheets 17 are respectively arranged corresponding to the two second heat conducting rods 16, one end of the second elastic memory metal sheet 17 is fixedly connected with the end of the second heat conducting rod 16 far from the second temperature sensing block 15, and the ends of the two second elastic memory metal sheets 17 far from the second heat conducting rods 16 are respectively connected to both sides of the slider 19; the slider 19 is slidably installed in the second heat preservation box 18, and both ends of the connecting slider 20 are fixedly connected with the slider 19 and the guiding plate 14 respectively; a limiting movement groove for slidably matching with the connecting slider 20 is clamped in the partition plate 3; the initial states of the two second elastic memory metal sheets 17 are bent, which is used to ensure that when the slider 19 slides, the deformation of the second elastic memory metal sheet 17 follows the deformation. In addition, when the temperature difference between the reactants in the two reaction channels is received, the multiple blocking members 6 on the partition plate 3 have two states: State 1: sliding in the communication port and opening the communication port, at this time the communication port is in a blocked state; State 2: the blocking member 6 abuts against the side surface of the guiding plate 14 to block the communication port; since the guiding plate 14 is arranged obliquely, the guiding plate 14 has 4 states. There are two states when the guiding plate 14 extends into the first reaction channel 4 (the two states when extending into the second reaction channel 5 are the same). When the guiding plate 14 extends into the first reaction channel 4, one is that the guiding inclined surface of the guiding plate 14 forms an acute angle with the flowing direction of the reactant, and the other is that the guiding inclined surface of the guiding plate 14 forms an obtuse angle with the flowing direction of the reactant. The extended guiding plate 14 can disrupt the material flow, make the reactants form a complex flow pattern in the reaction channel, increase the collision and contact opportunities, and promote the reaction to proceed.

[0030] It should be noted that both the second elastic memory metal sheet 17 and the second heat conducting rod 16 are wrapped with flexible heat insulation materials.

[0031] As Figure 1 As shown in the figure, a liquid inlet pipe 21 and a liquid discharge pipe 22 are installed on the reactor tank body 1. The liquid inlet pipe 21 is located at the top of the reactor tank body 1, and the liquid discharge pipe 22 is located on the outer periphery of the reactor tank body 1. The reactor tank body 1 is filled with liquid through the liquid inlet pipe 21, so as to ensure uniform heating of the reactants in the spiral coil 2. The liquid discharge pipe 22 discharges the internal liquid. At the same time, other existing structures such as stirring blades are also installed in the reactor tank body 1, which are not shown in the figure.

[0032] The production process steps are as follows: Step 1: Raw material preparation and feeding. The molar ratio of stearic acid to isooctanol is 1:1.4, and the molar ratio of the catalyst to stearic acid is 1:25. The catalyst is an acidic ionic liquid; Step 2: Esterification reaction. The mixed raw materials are pumped into the spiral coil 2 of the spiral coil reactor by the pump. The esterification reaction temperature is 140 - 160 °C, and the reaction time is 5 - 7 h. During this process, it is also necessary to monitor the reaction temperature, flow rate, etc. in real time; Step 3: Separation and purification. After the reaction is completed, the unreacted raw materials and by-products are removed by distillation.

[0033] As mentioned above, it is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A continuous production device for isooctyl stearate, characterized in that: The invention comprises a reactor tank body (1), wherein a spiral coil (2) is installed in the reactor tank body (1), both ends of the spiral coil (2) pass through the reactor tank body (1), and a partition (3) is installed in the spiral coil (2), and the partition (3) can separate the spiral coil (2) into a first reaction channel (4) and a second reaction channel (5); The partition (3) is provided with a communication port capable of connecting the first reaction channel (4) and the second reaction channel (5); a blocking structure is installed on the partition (3); the blocking structure is capable of blocking the communication port; a temperature control driving mechanism is installed on the partition (3); when there is a difference in temperature between the reactants in the first reaction channel (4) and the second reaction channel (5), the temperature control driving mechanism is capable of controlling the blocking structure to open and close the communication port; The partition plate (3) is also provided with a guiding mechanism, and when there is a temperature difference between the reactants in the first reaction channel (4) and the second reaction channel (5), the guiding mechanism can guide the reactants in the first reaction channel (4) and the second reaction channel (5) to flow mutually.

2. A continuous production device for isooctyl stearate according to claim 1, characterized in that: The blocking structure comprises a blocking member (6); the blocking member (6) comprises two sealing plates and a connecting block, the two sealing plates being arranged parallel to each other, the two sealing plates being fixedly connected to two sides of the connecting block respectively, the connecting block being slidably mounted in the connecting port, and the two sealing plates being capable of respectively blocking openings at both ends of the connecting port.

3. A continuous production device for isooctyl stearate according to claim 2, characterized in that: The temperature control drive mechanism comprises a traction rod (7), a No. 1 temperature sensing block (8), a No. 1 heat preservation box (9), a No. 1 heat conducting rod (10) and a temperature sensing drive assembly; the No. 1 heat preservation box (9) is fixedly mounted in the partition (3); one end of the traction rod (7) is fixedly connected to a connecting block of the sealing member (6); a moving groove for slidingly cooperating with the traction rod (7) is provided in the partition (3); an end of the traction rod (7) away from the connecting block passes through the No. 1 heat preservation box (9) and extends to the interior of the No. 1 heat preservation box (9); The number of the No. 1 temperature sensing blocks (8) is two, and the two No. 1 temperature sensing blocks (8) are fixedly mounted on the inner walls of the No. 1 reaction channel (4) and the No. 2 reaction channel (5), respectively. The number of the No. 1 heat conducting rods (10) is two, and the two No. 1 heat conducting rods (10) are arranged in a one-to-one correspondence with the two No. 1 temperature sensing blocks (8). One end of the No. 1 heat conducting rod (10) is fixedly connected to the No. 1 temperature sensing block (8), and one end of the No. 1 heat conducting rod (10) away from the No. 1 temperature sensing block (8) extends into the No. 1 heat insulation box (9); There are two temperature sensing drive assemblies, and the two temperature sensing drive assemblies are arranged in a one-to-one correspondence with the two No. 1 heat conducting rods (10). The temperature sensing drive assemblies can drive the traction rod (7) to slide in the motion groove.

4. A continuous production device for isooctyl stearate according to claim 3, characterized in that: The temperature sensing drive assembly comprises a first elastic memory metal sheet (11) and a heat insulating block (12); one end of the first elastic memory metal sheet (11) is fixedly connected to an end of a first heat conducting rod (10) away from the first temperature sensing block (8); the heat insulating block (12) is fixedly connected to an end of the first elastic memory metal sheet (11) away from the first heat conducting rod (10); a slide groove is provided on the heat insulating block (12); a slide shaft (13) is fixedly connected to the traction rod (7); and the slide shaft (13) is slidably installed in the slide groove.

5. A continuous production device for isooctyl stearate according to claim 1, characterized in that: The guide mechanism comprises a guide plate (14) and a temperature difference drive component; an inner wall on one side of the communication port is an inclined surface, and the guide plate (14) is slidably arranged on the inclined inner wall of the communication port; The temperature difference driving component is used to drive the guide plate (14) to slide on the inclined inner wall of the communication port.

6. A continuous production device for isooctyl stearate according to claim 5, characterized in that: The temperature difference driving assembly comprises two No. 2 temperature sensing blocks (15), two No. 2 heat conducting rods (16), two No. 2 elastic memory metal sheets (17), a No. 2 heat preservation box (18), a slider (19) and a connecting slider (20); the two No. 2 temperature sensing blocks (15) are respectively fixedly mounted on the inner walls of the No. 1 reaction channel (4) and the No. 2 reaction channel (5); the two No. 2 heat conducting rods (16) are respectively arranged in a one-to-one correspondence with the two No. 2 temperature sensing blocks (15); one end of the No. 2 heat conducting rod (16) is fixedly connected to the No. 2 temperature sensing block (15); the No. 2 heat preservation box (18) is fixedly mounted in the partition (3); and one end of the No. 2 heat conducting rod (16) away from the No. 2 temperature sensing block (15) is located In the No. 2 heat preservation box (18), the two No. 2 elastic memory metal sheets (17) are respectively arranged in one-to-one correspondence with the two No. 2 heat conducting rods (16); one end of the No. 2 elastic memory metal sheet (17) is fixedly connected to the end of the No. 2 heat conducting rod (16) away from the No. 2 temperature sensing block (15); the ends of the two No. 2 elastic memory metal sheets (17) away from the No. 2 heat conducting rod (16) are respectively connected to the two sides of a slider (19); the slider (19) is slidably installed in the No. 2 heat preservation box (18); the two ends of the connecting slider (20) are respectively fixedly connected to the slider (19) and the guide plate (14); and the partition plate (3) has a four-in-one limit motion groove that slidably cooperates with the connecting slider (20).

7. A continuous production device for isooctyl stearate according to claim 1, characterized in that: A liquid inlet pipe (21) and a liquid discharge pipe (22) are installed on the reactor tank body (1); the liquid inlet pipe (21) is located at the top of the reactor tank body (1), and the liquid discharge pipe (22) is located at the periphery of the reactor tank body (1).

8. A continuous production process of isooctyl stearate, using a continuous production device of isooctyl stearate according to any one of claims 1 to 7, characterized in that: The production process steps are as follows: Step 1: Raw material preparation and feeding, stearic acid, isooctyl alcohol and catalyst are mixed in proportion; Step 2: esterification reaction, the mixed raw materials are pumped into the spiral coil (2) of the spiral coil reactor by a pump; Step 3: Separation and purification: After the reaction is completed, unreacted raw materials and by-products are removed by distillation.

9. A continuous production process of isooctyl stearate according to claim 8, characterized in that: In step 1, the catalyst is an acidic ionic liquid; The molar ratio of stearic acid to isooctyl alcohol is 1:1.4, and the molar ratio of the catalyst to stearic acid is 1:

25.

10. A continuous production process of isooctyl stearate according to claim 9, characterized in that: In step 2, the esterification reaction temperature is 140-160° C., and the reaction time is 5-7 h.

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