Epichlorohydrin saponification reaction system

Abstract

The utility model relates to the technical field of chemical industry device, specifically disclose an epoxy chloropropane saponification reaction system, including reactor, the both ends of reactor are connected with crude distillation column and circulation pipeline respectively, and the plate and frame filter press is connected between crude distillation column and circulation pipeline, and the first feeding pipe and the second feeding pipe are sequentially connected on the circulation pipeline, and the top of crude distillation column is provided with the discharge pipe no. The inner chamber of reactor is spaced and fixedly provided with a plurality of annular baffle and channel baffle, a plurality of annular baffles and channel baffles are staggered arrangement, and the overall annular baffle is circular structure, a plurality of through -holes are evenly and spacedly penetrated on the channel baffle, and the outer diameter of annular baffle, the diameter of channel baffle all and the inner diameter of reactor are adapted. The utility model solves the problem that the raw material is not mixed by the annular baffle and channel baffle of staggered arrangement, avoids the local lye pH too high or too low to cause the side reaction intensification, the reaction rate drops and so on.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and specifically discloses an epichlorohydrin saponification reaction system. Background Technology

[0002] Epichlorohydrin is a core raw material for the production of epoxy resins and chlorohydrin rubbers. The glycerol-based epichlorohydrin process has rapidly emerged due to its advantages such as low chlorine pollution and resource utilization of raw materials. However, the saponification reaction system of the glycerol-based epichlorohydrin process, as a core component of the process, still faces multiple technical bottlenecks that restrict the industry's development. 1. Uneven feed mixing and low conversion rate: Dichloropropanol and alkali solution are directly injected into the pipeline reactor without a premixing structure. The mixing time is short and the conversion rate is low. This easily leads to areas with excessively high or low alkali solution concentrations. Excessively high local alkali solution concentrations will aggravate side reactions, while excessively low local alkali solution concentrations will reduce the reaction rate. This results in large fluctuations in the concentration of epichlorohydrin at the outlet, which affects the stability of subsequent distillation and separation.

[0003] 2. The saline wastewater produced by the saponification reaction contains a large amount of unreacted dichloropropanol raw material. Directly entering the subsequent evaporation unit not only wastes resources but also easily damages the equipment. Utility Model Content

[0004] To address the shortcomings of the existing technology, this invention provides an epichlorohydrin saponification reaction system that optimizes the reactor structure and achieves efficient, low-cost, and clean production of epichlorohydrin.

[0005] The technical solution adopted by this utility model to solve its technical problem is: The epichlorohydrin saponification reaction system includes a reactor, with a crude steaming tower and a circulation pipeline connected to both ends of the reactor, a plate and frame filter press connected between the crude steaming tower and the circulation pipeline, and feed pipe one and feed pipe two connected in sequence on the circulation pipeline. A discharge pipe one is provided at the top of the crude steaming tower. The reactor's inner cavity is equipped with several annular baffles and channel baffles that are spaced apart and fixedly installed. The annular baffles and channel baffles are arranged alternately. The annular baffles are in a circular ring structure. The channel baffles are provided with several through holes that are evenly spaced and intermittently opened. The outer diameter of the annular baffles and the diameter of the channel baffles are adapted to the inner diameter of the reactor.

[0006] Furthermore, a discharge section is provided at the bottom of the reactor near the coarse steaming tower. The discharge section has a funnel-shaped structure with openings at both ends. The larger diameter end of the discharge section is connected to the reactor, and the smaller diameter end is connected to the coarse steaming tower. A discharge valve is provided at the bottom of the discharge section.

[0007] Furthermore, a liquid level detection device is installed on the side of the reactor near the crude distillation tower, and a control unit is installed on the outside of the reactor. The discharge valve and the liquid level detection device are all linked to the control unit.

[0008] Furthermore, two sets of annular baffles and pore baffles are provided. The two sets of annular baffles are located on the side of the two sets of pore baffles that are close to the circulation pipeline, and the two sets of annular baffles and the two sets of pore baffles are located on the side of the reactor cavity that is close to the circulation pipeline.

[0009] Furthermore, a feed inlet is provided at the end of the reactor away from the crude distillation tower, and the feed inlet is connected to the circulation pipeline.

[0010] Furthermore, a condenser is installed at the end of the discharge pipe away from the crude distillation tower. The condenser is used to recover crude epichlorohydrin and light components.

[0011] Furthermore, a diversion device is provided at the end of the plate and frame filter press away from the coarse steaming tower, and a circulation pipeline and a discharge pipe are connected at intervals on the side of the diversion device away from the plate and frame filter press.

[0012] Furthermore, a pH sensor and a concentration sensor are installed on the side of the plate and frame filter press away from the coarse distillation tower, and both the pH sensor and the concentration sensor are linked to the diversion device.

[0013] Furthermore, several guide vanes are evenly and regularly fixedly arranged on the inner wall of the reactor near the coarse steaming tower, and all the guide vanes are inclined towards the coarse steaming tower.

[0014] Furthermore, feed pipe two is connected to the middle of the circulation pipeline, and feed pipe one is connected to the side of the circulation pipeline near the reactor.

[0015] The beneficial effects of this utility model are: This invention solves the problem of uneven raw material mixing by using a series of staggered annular baffles and perforated baffles, avoiding the aggravation of side reactions and the decrease in reaction rate caused by excessively high or low pH of the alkaline solution in some areas, thereby improving the conversion rate of dichloropropanol and reducing the concentration fluctuation of epichlorohydrin at the outlet, ensuring the stability of subsequent distillation and separation. The circulation pipeline allows unreacted dichloropropanol to be recycled back into the reactor with the brine to participate in the reaction again, avoiding the waste of raw materials caused by direct discharge and reducing the consumption cost of raw materials. The plate and frame filter press allows the brine to remove solid impurities before recycling or discharge, reducing the scouring and corrosion of subsequent equipment by impurities and unreacted raw materials, extending equipment lifespan, and reducing equipment maintenance costs. This invention, through raw material recycling and the reduction of side reactions, aligns with the core advantages of the glycerol process—low chlorine pollution and resource utilization of raw materials—and contributes to the clean production of epichlorohydrin. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the longitudinal section structure of the annular baffle of this utility model; Figure 3 This is a schematic diagram of the longitudinal section structure of the hole baffle and through hole of this utility model.

[0017] In the diagram: 1. Reactor; 101. Annular baffle; 102. Orifice baffle; 103. Through hole; 104. Discharge section; 105. Liquid level detection device; 106. Control unit; 107. Guide vane; 2. Coarse distillation tower; 3. Circulation pipeline; 4. Plate and frame filter press; 5. Feed pipe one; 6. Feed pipe two; 7. Discharge pipe two; 8. Discharge pipe one; 9. Inlet; 10. Condenser; 11. Diverter; 12. pH sensor; 13. Concentration sensor. Detailed Implementation

[0018] The present invention will now be described and explained in detail with reference to the accompanying drawings.

[0019] Example 1 like Figure 1-3 As shown, the epichlorohydrin saponification reaction system includes a reactor 1, with a crude distillation tower 2 and a circulation pipeline 3 connected to both ends of the reactor 1, and a plate and frame filter press 4 connected between the crude distillation tower 2 and the circulation pipeline 3. A feed pipe 5 and a feed pipe 6 are connected in sequence on the circulation pipeline 3, and a discharge pipe 8 is provided at the top of the crude distillation tower 2. The inner cavity of reactor 1 is provided with several annular baffles 101 and channel baffles 102 at intervals and fixedly arranged. The annular baffles 101 and channel baffles 102 are arranged alternately. The annular baffles 101 are in a circular ring structure. The channel baffles 102 are provided with several through holes 103 evenly and at intervals. The outer diameter of the annular baffles 101 and the diameter of the channel baffles 102 are adapted to the inner diameter of reactor 1.

[0020] With the above setup, dichloropropanol and alkaline solution enter the circulation pipeline 3 through feed pipe 5 and feed pipe 6 respectively for mixing. After mixing, they enter the reactor 1. Through the design of several annular baffles 101 and channel baffles 102 staggered in the reactor 1, a multi-stage turbulence zone is formed, enhancing the turbulence effect and thus enhancing the mixing effect, making the two reactants more uniformly mixed and avoiding local concentration abnormalities. When the mixed material passes through the hole in the center of the annular baffle 101, the flow cross-sectional area suddenly decreases and the flow velocity increases sharply, forming a high-speed jet that generates strong turbulence and shear force. When the material passes through several through holes 103 on the channel baffle 102, it is divided into multiple fine streams, which can divide and recombine the material multiple times, ensuring the uniform distribution of the material on the cross-section of the reactor 1.

[0021] A discharge section 104 is provided at the bottom of the reactor 1 near the coarse steaming tower 2. The discharge section 104 is a funnel-shaped structure with openings at both ends. The large diameter end of the discharge section 104 is connected to the reactor 1, and the small diameter end of the discharge section 104 is connected to the coarse steaming tower 2. A discharge valve is provided at the bottom of the discharge section 104.

[0022] A liquid level detection device 105 is installed on the side of reactor 1 near the crude distillation tower 2, and a control unit 106 is installed on the outside of reactor 1. The discharge valve, the liquid level detection device 105 and the control unit 106 are all linked together.

[0023] Through the above settings, the liquid level detection device 105 monitors the liquid level in reactor 1 in real time, and the control unit 106 automatically adjusts the opening of the discharge valve according to the liquid level signal and the preset target residence time. When the liquid level is higher than the set value, the discharge valve opens wider to accelerate the discharge; when the liquid level is lower than the set value, the discharge valve closes to slow down the discharge. Through this feedback control, it is ensured that each batch of material undergoes a sufficiently long and stable reaction time in reactor 1, thereby reducing the residue of unreacted raw materials. The discharge section 104 with a funnel-shaped structure guides the material to converge towards the center, forming a piston flow pattern, so that the material that enters first is discharged first, and the material that enters later is discharged later, reducing backmixing of materials and ensuring the uniformity of the reaction degree.

[0024] Two sets of annular baffles 101 and pore baffles 102 are provided. The two sets of annular baffles 101 are located on the side of the two sets of pore baffles 102 close to the circulation pipe 3, and the two sets of annular baffles 101 and the two sets of pore baffles 102 are located on the side of the inner cavity of reactor 1 close to the circulation pipe 3.

[0025] Through the above configuration, the two sets of annular baffles 101 and the two sets of perforated baffles 102 form a continuous cycle of "splitting-mixing-re-splitting-re-mixing". The annular baffles 101 near the circulation pipe 3 generate high-speed jets and strong vortices, initially dispersing the mixed materials. The perforated baffles 102 near the circulation pipe 3 divide the initially mixed materials into multiple fine streams through several through holes 103 and distribute them laterally, beginning to correct radial concentration unevenness. The annular baffles 101 away from the circulation pipe 3 accelerate and vortex mix each distributed fine stream again. The perforated baffles 102 away from the circulation pipe 3 perform even finer splitting and distribution again.

[0026] The reactor 1 is provided with a feed inlet 9 at the end away from the crude distillation tower 2, and the feed inlet 9 is connected to the circulation pipeline 3.

[0027] A condenser 10 is installed at the end of the discharge pipe 8 that is away from the crude distillation tower 2. The condenser 10 is used to recover crude epichlorohydrin and light components.

[0028] With the above setup, the material reacted in reactor 1 enters crude distillation tower 2, where crude epichlorohydrin and light components are separated and recovered through condenser 10. The crude product is then subjected to subsequent distillation to obtain qualified products.

[0029] A diversion device 11 is provided at the end of the plate and frame filter press 4 away from the coarse steaming tower 2. A circulation pipeline 3 and a discharge pipe 7 are connected at intervals on the side of the diversion device 11 away from the plate and frame filter press 4.

[0030] A pH sensor 12 and a concentration sensor 13 are installed on the side of the plate and frame filter press 4 away from the coarse distillation tower 2. Both the pH sensor 12 and the concentration sensor 13 are linked to the flow distribution device 11.

[0031] With the above settings, the brine generated in the coarse distillation tower 2 is filtered by the plate and frame filter press 4 to remove solid impurities from the brine; the filtered brine is divided by the diversion device 11, with part of the brine being discharged directly through the discharge pipe 7, and the remaining brine being mixed with new alkali solution through the circulation pipe 3 and then returned to the reactor 1 to continue the reaction; by setting up pH sensor 12 and concentration sensor 13, both of which are linked to the diversion device 11, the amount of brine discharged and circulated can be adjusted according to the brine concentration and the pH value of the configurable alkali solution.

[0032] Several guide vanes 107 are evenly and regularly fixedly arranged on the inner wall of the reactor 1 near the coarse steaming tower 2, and the guide vanes 107 are all inclined towards the coarse steaming tower 2.

[0033] With the above configuration, when the material flows along the axial direction of the reactor 1, the inclined guide vanes 107 can impart an oblique velocity component to the fluid, forcing the material to move from the inner wall of the reactor 1 towards the center, thereby breaking the laminar boundary layer and achieving full radial mixing.

[0034] Feed pipe 2 6 is connected to the middle of circulation pipe 3, and feed pipe 1 5 is connected to the side of circulation pipe 3 near reactor 1.

[0035] Working principle and process: The reactants, dichloropropanol and alkaline solution, are mixed in the circulation pipeline 3 via feed pipe 5 and feed pipe 6, respectively. After mixing, the mixture enters reactor 1. In reactor 1, two sets of interleaved annular baffles 101 and two sets of perforated baffles 102 form a continuous cycle of "splitting-mixing-re-splitting-re-mixing." The annular baffles 101 near circulation pipeline 3 generate high-speed jets and strong vortices, initially dispersing the mixed material. The perforated baffles 102 near circulation pipeline 3, through several through-holes 103, divide the initially mixed material into multiple fine streams and distribute them laterally, beginning to correct radial concentration unevenness. The annular baffles 101 further accelerate and vortex-mix each distributed fine stream. The perforated baffles 102 further perform finer splitting and distribution, making the two reactants more uniformly mixed. The reacted material enters the coarse distillation tower 2 through the discharge section 104. When the liquid level detection device 105 detects the level of reactor 1... When the liquid level in the reactor 1 is higher than the set value, the control unit 106 controls the discharge valve to open wider to accelerate the discharge. When the liquid level detection device 105 detects that the liquid level in the reactor 1 is lower than the set value, the control unit 106 controls the discharge valve to close narrower to slow down the discharge. Through this feedback control, it is ensured that each batch of material undergoes a sufficiently long and stable reaction time in the reactor 1, thereby reducing the residue of unreacted raw materials. The crude distillation tower 2 separates the crude product and light components. The crude product enters the condenser 10 for recovery through the discharge pipe 8, and then undergoes subsequent distillation to obtain qualified products. The brine produced in the crude distillation tower 2 is filtered by the plate and frame filter press 4 to remove solid impurities. The filtered brine enters the diversion device 11 for diversion. Part of the brine is discharged directly through the discharge pipe 7, and the remaining brine is mixed with the new alkali solution through the circulation pipeline 3 and then returned to the reactor 1 to continue to participate in the reaction, forming a cycle. The amount of brine discharged and circulated is adjusted according to the brine concentration and the pH value of the configurable alkali solution.

Claims

1. An epichlorohydrin saponification reaction system, comprising a reactor (1), characterized in that, The reactor (1) is connected to a coarse steaming tower (2) and a circulation pipeline (3) at both ends respectively. A plate and frame filter press (4) is connected between the coarse steaming tower (2) and the circulation pipeline (3). Feed pipe one (5) and feed pipe two (6) are connected in sequence on the circulation pipeline (3). Discharge pipe one (8) is provided at the top of the coarse steaming tower (2). The reactor (1) has several annular baffles (101) and channel baffles (102) spaced and fixedly installed in its inner cavity. The annular baffles (101) and channel baffles (102) are arranged alternately. The annular baffles (101) are in a circular ring structure. The channel baffles (102) have several through holes (103) evenly and spaced through them. The outer diameter of the annular baffles (101) and the diameter of the channel baffles (102) are adapted to the inner diameter of the reactor (1).

2. The epichlorohydrin saponification reaction system according to claim 1, characterized in that, A discharge section (104) is provided at the bottom of the reactor (1) near the side of the coarse steaming tower (2). The discharge section (104) is a funnel-shaped structure with openings at both ends. The large diameter end of the discharge section (104) is connected to the reactor (1), and the small diameter end of the discharge section (104) is connected to the coarse steaming tower (2). A discharge valve is provided at the bottom of the discharge section (104).

3. The epichlorohydrin saponification reaction system according to claim 2, characterized in that, A liquid level detection device (105) is installed on the side of the reactor (1) near the crude steam tower (2), and a control unit (106) is installed on the outside of the reactor (1). The discharge valve, the liquid level detection device (105) are all linked to the control unit (106).

4. The epichlorohydrin saponification reaction system according to claim 1, characterized in that, Two sets of annular baffles (101) and pore baffles (102) are provided. The two sets of annular baffles (101) are located on the side of the two sets of pore baffles (102) close to the circulation pipeline (3), and the two sets of annular baffles (101) and the two sets of pore baffles (102) are located on the side of the inner cavity of the reactor (1) close to the circulation pipeline (3).

5. The epichlorohydrin saponification reaction system according to claim 1, characterized in that, The reactor (1) is provided with a feed inlet (9) at the end away from the crude steam tower (2), and the feed inlet (9) is connected to the circulation pipeline (3).

6. The epichlorohydrin saponification reaction system according to claim 1, characterized in that, A condenser (10) is installed at the end of the discharge pipe (8) away from the crude distillation tower (2). The condenser (10) is used to recover crude epichlorohydrin and light components.

7. The epichlorohydrin saponification reaction system according to claim 1, characterized in that, A diversion device (11) is provided at the end of the plate and frame filter press (4) away from the coarse steaming tower (2). The diversion device (11) is connected to a circulation pipeline (3) and a discharge pipe (7) at intervals on the side away from the plate and frame filter press (4).

8. The epichlorohydrin saponification reaction system according to claim 7, characterized in that, A pH sensor (12) and a concentration sensor (13) are installed on the side of the plate and frame filter press (4) away from the coarse distillation tower (2). The pH sensor (12) and the concentration sensor (13) are both linked to the diversion device (11).

9. The epichlorohydrin saponification reaction system according to claim 1, characterized in that, Several guide vanes (107) are evenly and regularly fixedly arranged on the inner wall of the reactor (1) near the coarse steam tower (2), and the guide vanes (107) are all inclined towards the coarse steam tower (2).

10. The epichlorohydrin saponification reaction system according to claim 1, characterized in that, Feed pipe 2 (6) is connected to the middle of the circulation pipe (3), and feed pipe 1 (5) is connected to the side of the circulation pipe (3) near the reactor (1).

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