System for preparing glyphosate by oxidizing N-(phosphonomethyl) iminodiacetic acid

Abstract

The utility model provides a system for preparing glyphosate by oxidizing N-(phosphonomethyl) iminodiacetic acid. The system comprises a high-pressure reactor and a built-in strengthening unit, at least two catalyst bed layers are arranged in the high-pressure reactor, each catalyst bed layer is arranged below the liquid level in the high-pressure reactor, and a built-in strengthening unit is arranged between every two adjacent catalyst bed layers; the built-in strengthening unit comprises a first strengthening reactor and a receiving disc arranged under the first strengthening reactor, the receiving disc is of an inverted arc-shaped concave structure with a low center and a high edge, an acceleration area is arranged in the center area of the receiving disc, and the acceleration area is arranged opposite to an outlet of the first strengthening reactor. According to the system disclosed by the utility model, oxygen and a N-(phosphonomethyl) iminodiacetic acid solution are crushed and dispersed into micron-sized bubbles through the enhanced reactor, so that the dissolution rate of oxygen and the oxidation reaction rate are greatly improved, and the conversion rate of raw materials is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of glyphosate preparation, in particular to a system for preparing glyphosate by oxidizing diglyphosate. Background Art

[0002] Among agricultural chemical products, glyphosate has become one of the most widely used herbicide chemicals in the world due to its excellent effect as a non-selective, broad-spectrum herbicide. Its production process mainly relies on the chemical pathway of converting dimethylglyphosate into glyphosate through oxidation reaction. Currently, this conversion process mainly uses oxygen or chemical reagents (such as hydrogen peroxide) as oxidation media. Although these methods have been widely adopted, they have a series of technical challenges and limitations in practical application.

[0003] Although the method of using hydrogen peroxide as an oxidant can provide good oxidation efficiency, hydrogen peroxide itself is expensive and consumed in large quantities during the reaction, which significantly increases production costs. In addition, the safety of hydrogen peroxide during storage and use is also a risk factor that cannot be ignored. The use of oxygen as an oxidant for the oxidation of glyphosate is cost-effective and environmentally friendly in theory, but it faces significant difficulties in practice. The main problem is that the solubility of oxygen in the reaction medium is relatively low, which limits the efficiency of the oxidation reaction. The low solubility rate leads to insufficient effective supply of oxygen at the reaction interface, which affects the rate and completeness of the oxidation process. This lack of efficiency not only reduces the yield of glyphosate, but may also affect the quality and purity of the final product.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The utility model aims to provide a system for preparing glyphosate by oxidizing diaminoglyphosate. The system aims to solve the problems of low oxygen solubility and low glyphosate yield in the prior art, designs a reasonable process flow, and based on the enhanced reaction technology, breaks and disperses oxygen and diaminoglyphosate solution into micron-sized bubbles through an enhanced reactor, greatly improves the oxygen solubility and oxidation reaction rate, and improves the raw material conversion rate.

[0006] In order to achieve the above-mentioned purpose of the utility model, the following technical solutions are specially adopted:

[0007] The utility model provides a system for preparing glyphosate by oxidizing diglycophosphine, comprising:

[0008] Includes high pressure reactor and built-in strengthening unit;

[0009] At least two catalyst beds are arranged in the high-pressure enhanced reactor, and each catalyst bed is arranged below the liquid surface in the high-pressure reactor, and a built-in enhancement unit is arranged between two adjacent catalyst beds;

[0010] The built-in intensification unit includes a first intensification reactor and a receiving tray arranged directly below the first intensification reactor. The receiving tray is an inverted arc-shaped concave structure with a low center and high edges. An acceleration zone is arranged in the central area of ​​the receiving tray, and the acceleration zone is arranged opposite to the outlet of the first intensification reactor.

[0011] In the prior art, the use of oxygen as an oxidant for the oxidation of diaminophosphine faces significant difficulties in practice. The main problem is that the solubility of oxygen in the reaction medium is relatively low, which limits the efficiency of the oxidation reaction. At the same time, the low solubility leads to insufficient oxygen supply at the reaction interface, affecting the rate and completeness of the oxidation process.

[0012] In order to solve the above technical problems, the utility model provides a system for preparing glyphosate by oxidizing diglycophosphine. The overall structure of the synthesis system is simple. The utility model arranges a built-in strengthening unit between two catalyst beds, so that the reactants are pre-mixed and accelerated before entering the catalyst bed, creating more optimized conditions for the catalytic reaction.

[0013] By arranging a receiving tray below the outlet of the first enhanced reactor, the first enhanced reactor can be used to break up and disperse the diglycophos and oxygen into microbubbles, and these microbubbles are directly introduced into the acceleration zone in the center of the receiving tray, and the acceleration and distribution of the gas-liquid mixed flow are optimized through the acceleration zone. Since the receiving tray is an inverted arc-shaped concave structure with a low center and high edges, the gas-liquid mixed flow gathers toward the central area under the combined effects of gravity and geometric structure, and the outward flow guide structure inside the acceleration zone promotes the collection and acceleration of the gas-liquid mixed flow. The utility model not only accelerates the gas-liquid mixed flow, but also improves the mixing efficiency and uniformity, reduces the formation of local high-concentration areas, and reduces the occurrence of side reactions through the use of the receiving tray in conjunction with the first enhanced reactor.

[0014] Preferably, the surface of the acceleration zone is evenly distributed with a plurality of guide holes, and the hole direction of the guide holes is in the centrifugal direction. By providing a plurality of guide holes and setting the direction of the guide holes in the centrifugal direction, the gas-liquid mixture from the outlet of the first enhanced reactor can be effectively guided and dispersed, the distribution uniformity of the gas-liquid mixed flow between the catalyst beds is enhanced, the contact efficiency of the gas-liquid two phases is improved, and the efficiency of the overall reaction system and the utilization rate of the reactants are improved.

[0015] Preferably, the guide hole has a diameter of 30-60 μm. By limiting the diameter of the guide hole, the gas-liquid mixture forms smaller bubbles when passing through the acceleration zone, and large bubbles are filtered, thereby increasing the gas-liquid contact area and improving the oxidation efficiency and reaction rate.

[0016] Preferably, an outwardly inclined guide plate is arranged around the edge of the receiving plate, and a slow flow zone is formed at the connection between the guide plate and the receiving plate. By arranging the guide plate and forming the slow flow zone, the flow rate and direction of the reaction medium are effectively controlled, so that the reactants can enter the catalyst bed more smoothly for reaction, while reducing turbulence and eddy currents during the reaction process, improving the uniformity and stability of the reaction, and thus improving the reaction conversion rate and product quality; on the other hand, the guide plate can prolong the reaction time.

[0017] Preferably, the inclination angle of the guide plate along the horizontal direction is 30-60°; preferably, the inclination angle of the guide plate along the horizontal direction is 45°. By setting the inclination angle of the guide plate, not only the guidance of the fluid is optimized, but also the contact efficiency between the reaction medium and the catalyst is enhanced by adjusting the flow rate and flow direction. In addition, the guide plate of the utility model is combined with the first enhanced reactor to further enhance the kinetic conditions of the reaction process, making the reaction more complete while reducing energy consumption.

[0018] Preferably, an annular gas distributor is provided below the catalyst bed at the bottom layer in the high-pressure reactor. Specifically, oxygen enters through the inlet at the bottom of the annular gas distributor and is transmitted upward. The utility model ensures uniform distribution of gas in the reactor by providing an annular gas distributor, provides a uniform and continuous gas source for the reaction, and ensures the continuity and stability of the reaction.

[0019] Preferably, an external strengthening unit is arranged outside the high-pressure reactor, and the external strengthening unit includes a second strengthening reactor and a third strengthening reactor, and a connecting pipe is arranged between the second strengthening reactor and the third strengthening reactor, and the connecting pipe is connected to the internal strengthening unit. By using the external strengthening unit and the internal strengthening unit together, the flexibility and adjustment ability of the reaction system are greatly increased. At the same time, after the reaction materials are initially crushed and dispersed by the external strengthening unit, they are introduced into the first strengthening reactor of the internal strengthening unit for further crushing and dispersion, achieving a sufficient crushing effect.

[0020] Preferably, it also includes a feeding unit and a separation and purification unit;

[0021] The feeding unit comprises a bisphosphonic acid storage tank, an oxygen storage tank and a preheater, wherein the inlet of the preheater is connected to the bisphosphonic acid storage tank for preheating the bisphosphonic acid; the outlet of the preheater is connected to the second enhanced reactor; the oxygen storage tank is respectively connected to the third enhanced reactor and the annular gas distributor;

[0022] The separation and purification unit comprises a cooler, a separation tank and a distillation crystallization tower which are connected in sequence; the separation and purification unit is connected to the outlet at the bottom end of the high-pressure reactor.

[0023] By integrating the feed unit and the separation and purification unit, the complete process from raw material pretreatment to product separation and purification is realized, ensuring the efficient and continuous progress of the entire production process. The preheater is used to preheat the glyphosate to increase the reaction rate; the separation and purification unit is used to improve the yield and quality of glyphosate products.

[0024] In the utility model, the built-in strengthening unit is arranged between the catalyst beds, and the catalyst beds provide an efficient reaction surface to promote the oxidation reaction of diglycophosphine; and through the presence of the built-in strengthening unit, especially through the coordinated use of the first strengthening reactor and the receiving plate, the reactants are dispersed, crushed and mixed before entering the catalyst bed, and are accelerated to enter the catalyst bed through the acceleration zone of the receiving plate, thereby creating better conditions for the catalytic reaction.

[0025] The preparation system of the utility model is designed based on the reaction characteristics of preparing glyphosate by oxidation of diaminoglyphosate. The receiving plate of the utility model can accelerate the mixing of the liquid reaction medium and spray it on the surface of the catalyst bed. As a key component of the preparation system of the utility model, the receiving plate of the present application adopts an inverted arc-shaped concave structure with a low center and high edges, as well as a guide hole layout in the acceleration zone, which are all tailored to the flow characteristics and reaction kinetics requirements of the liquid reactants. This design optimizes the dispersion and mixing of the liquid reactants, especially in a water-based or similar liquid environment, ensuring the maximization of the reaction efficiency and product yield;

[0026] When designing oily liquids, the physical form of oily liquids, such as viscosity, surface tension and interaction with catalysts, is significantly different from that of water-based liquids or diglycol reaction media. These differences will affect the flow behavior of the oily liquid in the receiving tray, resulting in poor dispersion and mixing effects, affecting the uniformity and efficiency of the oxidation reaction.

[0027] Those skilled in the art can understand that the enhanced reactor used in the present invention has been embodied in the prior patents of the present invention, such as patents with application numbers CN201610641119.6, CN201610641251.7, CN201710766435.0, CN106187660, CN105903425A, CN109437390A, CN205833127U and CN207581700U. The prior patent CN201610641119.6 describes in detail the specific product structure and working principle of the micron bubble generator (i.e., enhanced reactor). The application document states that "the micron bubble generator includes a main body and a secondary crushing member, a cavity is provided in the main body, an inlet connected to the cavity is provided on the main body, the first and second opposite ends of the cavity are open, wherein the cross-sectional area of ​​the cavity decreases from the middle of the cavity to the first and second ends of the cavity; the secondary crushing member is provided at at least one of the first and second ends of the cavity, a part of the secondary crushing member is provided in the cavity, and an annular channel is formed between the secondary crushing member and the through holes open at both ends of the cavity. The micron bubble generator also includes an air inlet pipe and a liquid inlet pipe." From the specific structure disclosed in the application document, it can be known that its specific working principle is: the liquid enters the micron bubble generator tangentially through the liquid inlet pipe, rotates at ultra-high speed and cuts the gas, so that the gas bubbles are broken into micron-level microbubbles, thereby increasing the mass transfer area between the liquid phase and the gas phase, and the micron bubble generator in the patent belongs to a pneumatic enhanced reactor.

[0028] In addition, the prior patent 201610641251.7 records that the primary bubble breaker has a circulating liquid inlet, a circulating gas inlet and a gas-liquid mixture outlet, and the secondary bubble breaker connects the feed port with the gas-liquid mixture outlet, indicating that the bubble breaker requires gas-liquid mixture to enter. In addition, it can be seen from the following drawings that the primary bubble breaker mainly uses circulating liquid as power, so the primary bubble breaker actually belongs to a hydraulic enhanced reactor, and the secondary bubble breaker simultaneously passes the gas-liquid mixture into an elliptical rotating ball for rotation, thereby achieving bubble breaking during the rotation process, so the secondary bubble breaker actually belongs to a gas-liquid linkage enhanced reactor. In fact, whether it is a hydraulic enhanced reactor or a gas-liquid linkage enhanced reactor, it is a specific form of an enhanced reactor. However, the enhanced reactor adopted by the utility model is not limited to the above-mentioned forms. The specific structure of the bubble breaker recorded in the prior patent is only one of the forms that can be adopted by the enhanced reactor of the utility model.

[0029] In addition, the prior patent 201710766435.0 records that "the principle of the bubble breaker is a high-speed jet to achieve mutual collision of gases", and also explains that it can be used in a micro-interface enhanced reactor, verifying the correlation between the bubble breaker and the micro-interface generator itself; and the prior patent CN106187660 also has relevant records on the specific structure of the bubble breaker, see paragraphs

[0031] -

[0041] in the specification, and the attached drawings, which have a detailed description of the specific working principle of the bubble breaker S-2. The top of the bubble breaker is a liquid phase inlet, and the side is a gas phase inlet. The liquid phase coming in from the top provides suction power, thereby achieving the effect of crushing into ultrafine bubbles. It can also be seen in the attached drawings that the bubble breaker has a conical structure, and the diameter of the upper part is larger than the diameter of the lower part, so that the liquid phase can better provide suction power.

[0030] Since the enhanced reactor was just developed in the early stage of the prior patent application, it was named micron bubble generator (CN201610641119.6), bubble breaker (201710766435.0), etc. in the early stage. With the continuous technical improvement, it was later renamed as enhanced reactor. Now the enhanced reactor in the utility model is equivalent to the previous micron bubble generator, bubble breaker, etc., but the name is different. In summary, the enhanced reactor of the utility model belongs to the prior art.

[0031] Compared with the prior art, the beneficial effects of the utility model are:

[0032] (1) The utility model can enhance the uniformity of the gas-liquid mixture and the contact efficiency of the reaction medium by using the first enhanced reactor in the built-in enhanced unit in conjunction with the receiving plate, which not only accelerates the reaction process but also improves the conversion rate of diglycol and oxygen.

[0033] (2) The receiving plate of the utility model effectively controls the flow direction and speed of the reactants through the design of the acceleration zone and the guide hole, reduces the unevenness during the reaction process, and provides a more stable and uniform environment for the reaction.

[0034] (3) The utility model realizes the coordinated linkage between the internal intensification unit and the external intensification unit. The gas-liquid reaction materials are initially crushed and dispersed by the external intensification unit, and then are crushed and dispersed again in the internal intensification unit, thereby realizing the phase boundary mass transfer area between the reactants, thereby improving the yield and selectivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0036] Figure 1 A schematic diagram of a system flow for preparing glyphosate by oxidation of diglycophosphine provided in Example 1 of the utility model;

[0037] Figure 2 This is a schematic structural diagram of the receiving tray provided in Example 1 of the utility model.

[0038] in:

[0039] 1- High-pressure reactor; 2- Built-in strengthening unit;

[0040] 201-first enhanced reactor; 202-receiving plate;

[0041] 2021-acceleration zone; 2022-guide hole;

[0042] 2023-guide plate; 3-catalyst bed;

[0043] 4- annular gas distributor; 5- external strengthening unit;

[0044] 501-second enhanced reactor; 502-third enhanced reactor;

[0045] 503-connecting pipeline; 6-oxygen storage tank;

[0046] 7-Bis(ethylenediamine)phosphine storage tank; 8-preheater;

[0047] 9-Cooler; 10-Separation tank;

[0048] 11-Distillation crystallization tower. DETAILED DESCRIPTION

[0049] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are part of the embodiments of the utility model, rather than all of the embodiments, and are only used to illustrate the utility model, and should not be considered as limiting the scope of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In order to more clearly explain the technical solution of the present invention, it is described in the form of specific embodiments below.

[0053] Example 1

[0054] See also Figure 1-2 As shown, the system for preparing glyphosate by oxidation of diaminoglyphosate according to an embodiment of the utility model comprises a high-pressure reactor 1 and a built-in strengthening unit 2. At least two catalyst beds 3 are arranged in the high-pressure reactor 1, and each catalyst bed 3 is arranged below the liquid level in the high-pressure reactor 1. The built-in strengthening unit 2 is arranged between two adjacent catalyst beds 3; wherein the built-in strengthening unit 2 comprises a first strengthening reactor 201 and a receiving tray 202 arranged directly below the first strengthening reactor 201, see Figure 2 As shown, the receiving plate 202 is an inverted arc-shaped concave structure with a low center and high edges, and an acceleration zone 2021 is provided in the central area of ​​the receiving plate 202, and the acceleration zone 2021 is arranged opposite to the outlet of the first enhanced reactor 201. Specifically, a plurality of guide holes 2022 are evenly distributed on the surface of the acceleration zone 2021, and the hole direction of the guide hole 2022 is the centrifugal direction, and the aperture of the guide hole 2022 is 30-60 μm.

[0055] Preferably, an outwardly inclined guide plate 2023 is provided around the edge of the receiving plate 202, and a slow flow zone is formed at the connection between the guide plate 2023 and the receiving plate 202; the guide plate 2023 has an inclination angle of 45° in the horizontal direction.

[0056] Preferably, an annular gas distributor 4 is provided below the catalyst bed 3 at the bottom of the high-pressure reactor 1, and the gas enters from the bottom inlet of the annular gas distributor 4, and oxygen is transported upward from the bottom of the high-pressure reactor 1, which significantly improves the uniformity of the gas-liquid reaction and increases the reaction rate. It not only optimizes the contact area between oxygen and the diphosphine liquid, strengthens mass transfer, but also reduces the phenomenon of local overheating, prevents the catalyst bed 3 from being blocked, and ensures that the reaction process is stable.

[0057] An external enhancement unit 5 is arranged outside the high-pressure reactor 1 of this embodiment. The external enhancement unit 5 includes a second enhancement reactor 501 and a third enhancement reactor 502. A connecting pipe 503 is arranged between the second enhancement reactor 501 and the third enhancement reactor 502. The connecting pipe 503 is connected to the internal enhancement unit 2; specifically, the second enhancement reactor 501 is arranged above the third enhancement reactor 502; the connecting pipe 503 is connected to the first enhancement reactor 201.

[0058] The system for preparing glyphosate by oxidizing disodium glyphosate in this embodiment also includes a feeding unit and a separation and purification unit. The feeding unit includes a disodium glyphosate storage tank 7, an oxygen storage tank 6 and a preheater 8. The inlet of the preheater 8 is connected to the disodium glyphosate storage tank 7 for preheating the disodium glyphosate; the outlet of the preheater 8 is connected to the inlet of the second enhanced reactor 501; and the oxygen storage tank 6 is connected to the inlet of the third enhanced reactor 502.

[0059] The separation and purification unit comprises a cooler 9 , a separation tank 10 and a distillation crystallization tower 11 which are connected in sequence; the separation and purification unit is connected to the outlet at the bottom end of the high-pressure reactor 1 .

[0060] The system for preparing glyphosate by oxidation of diglycophosphine of the utility model comprises the following process flow in practical application:

[0061] Through the feeding unit, glyphosate and oxygen are taken out from the storage tank respectively, and the glyphosate is preheated by the preheater 8; the preheated glyphosate enters the second enhanced reactor 501, and the oxygen from the oxygen storage tank 6 enters the third enhanced reactor 502, and the oxygen and glyphosate liquid are broken and dispersed into microbubbles by the external enhanced unit 5, and then enter the high-pressure reactor 1 for reaction; after the reaction is completed, the product enters the separation and purification unit through the bottom outlet of the high-pressure reactor 1, and the purified glyphosate product is obtained through cooling, separation, distillation and crystallization.

[0062] Example 2

[0063] The only difference between this example and Example 1 is that the inclination angle of the guide plate is 10°.

[0064] Example 3

[0065] The only difference between this example and Example 1 is that the inclination angle of the guide plate is 90°.

[0066] Example 4

[0067] The only difference between this example and Example 1 is that the diameter of the guide hole is 10 mm.

[0068] Example 5

[0069] The only difference between this example and Example 1 is that the direction of the guide hole is the centripetal direction.

[0070] Comparative Example 1

[0071] The only difference between this example and Example 1 is that no built-in strengthening unit is provided.

[0072] Comparative Example 2

[0073] The only difference between this example and Example 1 is that no external strengthening unit is provided.

[0074] Comparative Example 3

[0075] The only difference between this example and Example 1 is that no annular gas distributor is provided.

[0076] Comparative Example 4

[0077] This example uses existing technology to directly oxidize oxygen and diglycosidic acid liquid to produce glyphosate.

[0078] Experimental Example 1

[0079] Glyphosate was prepared by using the systems of Examples 1-5 and Comparative Examples 1-3, respectively. Glyphosate liquid from a factory, with a flow rate of 500 kg / h, and oxygen, with a flow rate of 1500 m3 / h (under standard conditions), were reacted with a vanadium-based catalyst to produce glyphosate. The experimental data are as follows:

[0080] Table 1 Experimental data

[0081]

[0082]

[0083] When the prior art prepares glyphosate, the yield of the prepared glyphosate is 65%, wherein the conversion rate of diglyphosate is about 72%, and the reaction time is 18 hours. As can be seen from Table 1, compared with the prior art, the glyphosate yield and diglyphosate conversion rate of each embodiment of the utility model are significantly improved, and the diglyphosate conversion rate of embodiment 1 is 99%, the raw material utilization rate is 99%, the glyphosate yield is 95%, and the overall reaction time in embodiment 1 is significantly shortened, saving reaction energy consumption.

[0084] As can be seen from Table 1, Example 1 of the utility model is the optimal embodiment. The system of this embodiment uses a built-in strengthening unit in conjunction with a high-pressure reactor, and the obtained glyphosate product yield is significantly higher than the glyphosate yield synthesized in the prior art; at the same time, the reaction time is significantly shortened, indicating that the use of the built-in strengthening unit and the high-pressure reactor in Example 1 can achieve the optimal reaction effect. It can be seen that the preparation system of Example 1 has low reaction energy consumption and good preparation effect.

[0085] Among them, the yield of glyphosate in Comparative Example 1 is lower than that in Example 1. This is because Comparative Example 1 does not have a built-in strengthening unit, which cannot fully crush, disperse and evenly mix the reaction raw materials in the high-pressure reactor. It can be seen that Example 1 of the utility model improves the yield of glyphosate and the raw material conversion rate by setting a built-in strengthening unit in the high-pressure reactor.

[0086] In conclusion, compared with the prior art, the glyphosate preparation system of the utility model has high raw material conversion rate and high product yield, and is worthy of wide promotion and application.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A system for preparing glyphosate by oxidation of diglycophosphine, characterized in that: Includes high pressure reactor and built-in strengthening unit; At least two catalyst beds are arranged in the high-pressure reactor, and each catalyst bed is arranged below the liquid level in the high-pressure reactor, and a built-in strengthening unit is arranged between two adjacent catalyst beds; The built-in intensification unit includes a first intensification reactor and a receiving tray arranged directly below the first intensification reactor. The receiving tray is an inverted arc-shaped concave structure with a low center and high edges. An acceleration zone is arranged in the central area of ​​the receiving tray, and the acceleration zone is arranged opposite to the outlet of the first intensification reactor.

2. The system for preparing glyphosate by oxidation of diglycophosphine according to claim 1, characterized in that: A plurality of guide holes are evenly distributed on the surface of the acceleration zone, and the hole directions of the guide holes are in the centrifugal direction.

3. The system for preparing glyphosate by oxidation of diglycophosphine according to claim 2, characterized in that: The guide hole has a diameter of 30-60 μm.

4. The system for preparing glyphosate by oxidation of diglycophosphine according to claim 1, characterized in that: An outwardly inclined flow guide plate is arranged around the edge of the receiving tray, and a slow flow zone is formed at the connection between the flow guide plate and the receiving tray.

5. The system for preparing glyphosate by oxidation of diglycophosphine according to claim 4, characterized in that: The inclination angle of the guide plate along the horizontal direction is 30-60°.

6. The system for preparing glyphosate by oxidation of diglycophosphine according to claim 4, characterized in that: The inclination angle of the guide plate along the horizontal direction is 45°.

7. The system for preparing glyphosate by oxidation of diglycophosphine according to claim 1, characterized in that: An annular gas distributor is arranged below the catalyst bed at the bottom layer in the high-pressure reactor.

8. The system for preparing glyphosate by oxidation of diaminoglyphosate according to claim 7, characterized in that: An external strengthening unit is arranged outside the high-pressure reactor, and the external strengthening unit includes a second strengthening reactor and a third strengthening reactor. A connecting pipe is arranged between the second strengthening reactor and the third strengthening reactor, and the connecting pipe is connected to the internal strengthening unit.

9. The system for preparing glyphosate by oxidation of diglycophosphine according to claim 8, characterized in that: It also includes a feeding unit and a separation and purification unit; The feeding unit comprises a bisphosphonic acid storage tank, an oxygen storage tank and a preheater, wherein the inlet of the preheater is connected to the bisphosphonic acid storage tank for preheating the bisphosphonic acid; the outlet of the preheater is connected to the second enhanced reactor; the oxygen storage tank is respectively connected to the third enhanced reactor and the annular gas distributor; The separation and purification unit comprises a cooler, a separation tank and a distillation crystallization tower connected in sequence; The separation and purification unit is connected to the outlet at the bottom end of the high-pressure reactor.

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