CN222550843U - System for preparing glyphosate by N- (phosphonomethyl) iminodiacetic acid oxidation - Google Patents

Abstract

The utility model provides a system for preparing glyphosate by oxidation of diaminoglyphosate, wherein the system includes: a high-pressure reactor and a built-in strengthening unit; at least two catalyst beds are arranged in the high-pressure reactor, and each of the catalyst beds 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 strengthening unit includes a first strengthening reactor and a receiving plate arranged directly below the first strengthening reactor, the receiving plate is an inverted arc-shaped concave structure with a low center and a high edge, and an acceleration zone is arranged in the central area of the receiving plate, and the acceleration zone is arranged opposite to the outlet of the first strengthening reactor. The system of the utility model breaks and disperses oxygen and diaminoglyphosate solution into micron-sized bubbles through the strengthening reactor, greatly improves the dissolution rate of oxygen and the oxidation reaction rate, and improves the raw material conversion rate.

Description

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

Technical Field

The utility model belongs to the technical field of glyphosate preparation, and particularly relates to a system for preparing glyphosate by oxidizing N-phosphonomethyl iminodiacetic acid.

Background

Among agrochemical products, glyphosate is one of the most widely used herbicide chemicals worldwide due to its excellent effect as a non-selective, broad-spectrum herbicide. The production process mainly depends on the chemical path for converting N- (phosphonomethyl) iminodiacetic acid into glyphosate through oxidation reaction. Currently, the conversion process mainly adopts oxygen or a chemical reagent (such as hydrogen peroxide) as an oxidation medium. Although these methods have been widely adopted, they present a range of technical challenges and limitations in practical applications.

Although the method using hydrogen peroxide as an oxidant can provide better oxidation efficiency, the hydrogen peroxide has higher cost, and the consumption in the reaction process is large, so that the production cost is obviously increased, in addition, the safety problem of hydrogen peroxide in the storage and use processes is a non-negligible risk factor, and the oxidation of N- (phosphonomethyl) iminodiacetic acid by using oxygen as the oxidant has the advantages of cost effectiveness and environmental friendliness in theory, but has obvious problems in practice. The main problem is the relatively low solubility of oxygen in the reaction medium, which limits the efficiency of the oxidation reaction. The low dissolution rate results in an insufficient supply of oxygen at the reaction interface, thereby affecting the rate and completeness of the oxidation process. This lack of efficiency not only reduces the yield of glyphosate, but can also affect the quality and purity of the final product.

In view of this, the present utility model has been made.

Disclosure of utility model

The utility model aims to provide a system for preparing glyphosate by N- (phosphonomethyl) iminodiacetic acid oxidation, which aims at the problems of low oxygen dissolution rate and low glyphosate yield in the prior art, and is reasonable in design, and based on the enhanced reaction technology, an enhanced reactor is used for breaking and dispersing oxygen and N- (phosphonomethyl) iminodiacetic acid solution into micron-sized bubbles, so that the dissolution rate and the oxidation reaction rate of the oxygen are greatly improved, and the raw material conversion rate is improved.

In order to achieve the above object of the present utility model, the following technical solutions are specifically adopted:

the utility model provides a system for preparing glyphosate by N- (phosphonomethyl) iminodiacetic acid oxidation, which comprises:

comprises a high-pressure reactor and a built-in strengthening unit;

At least two catalyst beds are arranged in the high-pressure pressurizing reactor, each catalyst bed is arranged below the liquid level in the high-pressure reactor, and a built-in strengthening unit is arranged between every two adjacent catalyst beds;

The built-in strengthening unit comprises a first strengthening reactor and a bearing disc arranged under the first strengthening reactor, wherein the bearing disc is of an inverted arc-shaped concave structure with a low center and a high edge, an accelerating area is arranged in the central area of the bearing disc, and the accelerating area is opposite to an outlet of the first strengthening reactor.

In the prior art, the oxidation of N- (phosphonomethyl) iminodiacetic acid by using oxygen as an oxidant has remarkable problems in practice, mainly the relatively low solubility of the oxygen in a reaction medium limits the oxidation reaction efficiency, and meanwhile, the low solubility leads to insufficient oxygen supply on a reaction interface to influence the speed and completeness of the oxidation process.

In order to solve the technical problems, the utility model provides a system for preparing glyphosate by N- (phosphonomethyl) iminodiacetic acid oxidation, which has simple integral structure, is provided with a built-in strengthening unit between two catalyst beds, the reactants are premixed and accelerated before entering the catalyst bed, and more optimized conditions are created for the catalytic reaction.

By arranging the receiving disc below the outlet of the first strengthening reactor, the N- (phosphonomethyl) iminodiacetic acid and oxygen can be broken and dispersed into micro-bubbles by using the first strengthening reactor, the micro-bubbles directly enter an accelerating area in the center of the receiving disc, and the accelerating and distributing of the gas-liquid mixed flow are optimized by the accelerating area. Because the receiving disc is of an inverted arc-shaped concave structure with a low center and a high edge, the gas-liquid mixed flow gathers towards the center area under the combined action of gravity and a geometric structure, and the outward diversion structure in the accelerating area promotes the collection and acceleration of the gas-liquid mixed flow. The utility model not only accelerates the gas-liquid mixing flow, but also improves the mixing efficiency and uniformity, reduces the formation of local high-concentration areas and reduces the generation of side reactions through the cooperation of the receiving disc and the first strengthening reactor.

Preferably, a plurality of guide holes are uniformly distributed on the surface of the acceleration region, and Kong Xiang of the guide holes are in a centrifugal direction. Through setting up a plurality of guiding holes to set up the direction of guiding hole into centrifugal direction, make from the gas-liquid mixture of first intensive reactor export can effectively direction and dispersion, strengthen the distribution homogeneity of gas-liquid mixed flow between the catalyst bed, improve the two-phase contact efficiency of gas-liquid, improve the efficiency of whole reaction system and the utilization ratio of reactant.

Preferably, the aperture of the guide hole is 30-60 μm. By limiting the aperture of the guide hole, the gas-liquid mixture material forms finer bubbles when passing through the acceleration zone, and simultaneously filters large bubbles, so that the gas-liquid contact area is increased, and the oxidation efficiency and the reaction rate are improved.

Preferably, a baffle plate inclined outwards is arranged around the edge of the receiving disc, and a slow flow area is formed at the joint of the baffle plate and the receiving disc. By arranging the guide plate and forming the slow flow area, the flow speed and the direction of a reaction medium are effectively controlled, so that reactants can enter the catalyst bed layer more stably to react, meanwhile, turbulence and vortex in the reaction process are reduced, the uniformity and the stability of the reaction are improved, the reaction conversion rate and the product quality are further improved, and on the other hand, the guide plate can prolong the reaction time.

Preferably, the inclined angle of the guide plate along the horizontal direction is 30-60 degrees, and preferably, the inclined angle of the guide plate along the horizontal direction is 45 degrees. Through setting up the inclination of guide plate, not only optimized the direction of fluid, through adjusting velocity of flow and flow direction, strengthened the contact efficiency of reaction medium and catalyst. In addition, the baffle plate is combined with the first strengthening reactor, so that the dynamic conditions of the reaction process are further enhanced, the reaction is more complete, and the energy consumption is reduced.

Preferably, an annular gas distributor is arranged below the catalyst bed at the bottommost layer in the high-pressure reactor. Specifically, oxygen enters through an inlet at the bottom end of the annular gas distributor and is transported upwards. The utility model ensures the uniform distribution of the gas in the reactor by arranging the annular gas distributor, provides a uniform and continuous gas source for the reaction, and ensures the continuity and stability of the reaction.

Preferably, an external strengthening unit is arranged on the outer side of the high-pressure reactor, the external strengthening unit comprises a second strengthening reactor and a third strengthening reactor, a communication pipeline is arranged between the second strengthening reactor and the third strengthening reactor, and the communication pipeline is connected with the internal strengthening unit. Through the combined use of the external strengthening unit and the internal strengthening unit, the flexibility and the regulating capability of the reaction system are greatly improved, and meanwhile, the reaction materials are subjected to primary crushing and dispersing through the external strengthening unit and then are introduced into the first strengthening reactor of the internal strengthening unit for secondary crushing and dispersing, so that the effect of full crushing is achieved.

Preferably, the device also comprises a feeding unit and a separation and purification unit;

The feeding unit comprises a N-phosphonomethyl iminodiacetic acid storage tank, an oxygen storage tank and a preheater, wherein an inlet of the preheater is connected with the N-phosphonomethyl iminodiacetic acid storage tank to preheat the N-phosphonomethyl iminodiacetic acid;

The separation and purification unit comprises a cooler, a separation tank and a distillation crystallization tower which are sequentially connected, and is connected with an outlet at the bottom end of the high-pressure reactor.

By integrating the feeding unit and the separation and purification unit, the complete process from raw material pretreatment to product separation and purification is realized, and the high-efficiency continuous operation of the whole production process is ensured. The PMIDA is preheated by a preheater, so that the reaction rate is improved, and the yield and quality of glyphosate products are improved by a separation and purification unit.

The utility model provides a high-efficiency reaction surface through the catalyst beds by arranging the built-in strengthening units between the catalyst beds, promotes the oxidation reaction of N- (phosphonomethyl) iminodiacetic acid, and creates better conditions for the catalytic reaction by the presence of the built-in strengthening units, particularly by the cooperation of the first strengthening reactor and the receiving disc, so that reactants are dispersed, crushed and mixed before entering the catalyst beds and accelerated to enter the catalyst beds through the accelerating area of the receiving disc.

The preparation system is designed based on the reaction characteristics of preparing glyphosate by N- (phosphonomethyl) iminodiacetic acid oxidation. The receiving disc can accelerate and mix the liquid reaction medium uniformly and spray the liquid reaction medium on the surface of the catalyst bed. As key components of the preparation system, the tray adopts an inverted arc-shaped concave structure with low center and high edge, and the layout of the guide holes of the accelerating region is customized according to the flow characteristic and the reaction kinetic demand of the liquid reactant, so that the design optimizes the dispersion and the mixing of the liquid reactant, and particularly ensures the maximization of the reaction efficiency and the product yield in a water-based or similar liquid environment;

When the oily liquid is designed, the physical form of the oily liquid, such as viscosity, surface tension and interaction with a catalyst, is obviously different from that of a water-based liquid or a reaction medium of N- (phosphonomethyl) iminodiacetic acid, and the differences influence the flowing behavior of the oily liquid in the receiving tray, so that the dispersing and mixing effects are poor, and the uniformity and the efficiency of the oxidation reaction are influenced.

It will be appreciated by those skilled in the art that the enhanced reactors employed in the present utility model are described in the inventor's prior patents, such as patent application number CN201610641119.6、CN201610641251.7、CN201710766435.0、CN106187660、CN105903425A、CN109437390A、CN205833127U and CN 207581700U. The specific product structure and working principle of the microbubble generator (i.e. the reinforced reactor) are described in detail in the prior patent CN201610641119.6, and the application document describes that the microbubble generator comprises a body and a secondary crushing member, the body is internally provided with a cavity, the body is provided with an inlet communicated with the cavity, the opposite first end and second end of the cavity are both open, the cross-sectional area of the cavity is reduced from the middle part of the cavity to the first end and the second end of the cavity, the secondary crushing member is arranged at least one of the first end and the second end of the cavity, a part of the secondary crushing member is arranged in the cavity, and an annular channel is formed between the secondary crushing member and a through hole with two open ends of the cavity. The micro bubble generator also comprises an air inlet pipe and a liquid inlet pipe. The specific structure disclosed in the application document can know the specific working principle that liquid enters the micro-bubble generator tangentially through a liquid inlet pipe, and gas is rotated and cut at an ultrahigh speed, so that gas bubbles are broken into micro-bubbles at a micron level, the mass transfer area between a liquid phase and a gas phase is improved, and the micro-bubble generator in the patent belongs to a pneumatic strengthening reactor.

In addition, in the prior patent 201610641251.7, it is described 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 communicates the feed inlet with the gas-liquid mixture outlet, which means that the bubble breaker needs to be mixed with gas and liquid, and in addition, as shown in the following figures, the primary bubble breaker mainly uses the circulating liquid as power, so that the primary bubble breaker belongs to a hydraulic strengthening reactor, and the secondary bubble breaker simultaneously introduces the gas-liquid mixture into an elliptical rotating ball for rotation, thereby realizing bubble breaking during rotation, so that the secondary bubble breaker actually belongs to the gas-liquid linkage strengthening reactor. In fact, both the hydraulic type strengthening reactor and the gas-liquid linkage type strengthening reactor belong to a specific form of strengthening reactor, however, the strengthening reactor adopted by the utility model is not limited to the above-mentioned forms, and the specific structure of the bubble breaker disclosed in the prior patent is only one form which can be adopted by the strengthening reactor of the utility model.

In addition, the prior patent 201710766435.0 describes that the principle of the bubble breaker is that high-speed jet flow is used for achieving the mutual collision of gases, and describes that the bubble breaker can be used for a micro-interface strengthening reactor, the relevance between the bubble breaker and a micro-interface generator is verified, the prior patent CN106187660 also describes that the specific structure of the bubble breaker is relevant, particularly, the [0031] - [0041] in the specification, and the drawing part describes the specific working principle of the bubble breaker S-2 in detail, the top of the bubble breaker is a liquid phase inlet, the side surface is a gas phase inlet, the entrainment power is provided by the liquid phase entering from the top, the effect of smashing into superfine bubbles is achieved, the bubble breaker is in a conical structure in the drawing, the diameter of the upper part is larger than that of the lower part, and the entrainment power is provided for the liquid phase.

Since the enhanced reactor was developed just before in the early stage of the prior patent application, the enhanced reactor is named as a micron bubble generator (CN 201610641119.6), a bubble breaker (201710766435.0) and the like in the early stage, and with the continuous technological improvement, the enhanced reactor is named as an enhanced reactor in the later stage, and the enhanced reactor in the utility model is equivalent to the prior micron bubble generator, the bubble breaker and the like, but the names are different. In summary, the enhanced reactor of the present utility model belongs to the prior art.

Compared with the prior art, the utility model has the beneficial effects that:

(1) According to the utility model, through the matched use of the first strengthening reactor and the receiving disc in the built-in strengthening unit, the uniformity of gas-liquid mixture materials and the contact efficiency of a reaction medium can be enhanced, the reaction process is accelerated, and the conversion rate of N- (phosphonomethyl) iminodiacetic acid and oxygen is improved.

(2) The tray effectively controls the flow direction and the speed of reactants through the design of the accelerating area and the guide holes, reduces the non-uniformity phenomenon in the reaction process, and provides a more stable and uniform environment for the reaction.

(3) According to the utility model, through the cooperation linkage of the internal strengthening unit and the external strengthening unit, the gas-liquid reaction material is subjected to primary crushing and dispersing through the external strengthening unit, and then is introduced into the internal strengthening unit for secondary crushing and dispersing, so that the phase boundary mass transfer area between reactants can be realized, and the yield and the selectivity are improved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic flow chart of a system for preparing glyphosate by N- (phosphonomethyl) iminodiacetic acid oxidation according to the embodiment 1 of the present utility model;

Fig. 2 is a schematic structural diagram of a receiving disc according to embodiment 1 of the present utility model.

Wherein:

1-high pressure reactor, 2-built-in strengthening unit;

201-a first reinforced reactor 202-a receiving tray;

2021-accelerating region, 2022-guiding holes;

2023-baffle, 3-catalyst bed;

4-annular gas distributor, 5-external strengthening unit;

501-a second strengthening reactor, 502-a third strengthening reactor;

503-communication pipeline, 6-oxygen storage tank;

A 7-N-phosphonomethyl iminodiacetic acid storage tank and an 8-preheater;

9-cooler, 10-separating tank;

11-a distillation crystallization tower.

Detailed Description

The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings and detailed description, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present utility model, and are intended to be illustrative of the present utility model only and should not be construed as limiting the scope of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In order to more clearly illustrate the technical scheme of the utility model, the following description is given by way of specific examples.

Example 1

Referring to fig. 1-2, the system for preparing glyphosate by oxidation of PMIDA according to the embodiment of the utility model comprises a high-pressure reactor 1 and a built-in reinforcement unit 2, wherein at least two catalyst beds 3 are arranged in the high-pressure reactor 1, each catalyst bed 3 is arranged below the liquid level in the high-pressure reactor 1, the built-in reinforcement unit 2 is arranged between two adjacent catalyst beds 3, the built-in reinforcement unit 2 comprises a first reinforcement reactor 201 and a receiving disc 202 arranged right below the first reinforcement reactor 201, the receiving disc 202 is of an inverted arc-shaped concave structure with a low center and a high edge, the central area of the receiving disc 202 is provided with an accelerating area 2021, and the accelerating area 2021 is arranged opposite to the outlet of the first reinforcement reactor 201, as shown in fig. 2. Specifically, the surface of the acceleration region 2021 is uniformly provided with a plurality of guide holes 2022, kong Xiang of the guide holes 2022 are in a centrifugal direction, and the aperture of the guide holes 2022 is 30-60 μm.

Preferably, an outwardly inclined baffle 2023 is provided around the edge of the tray 202, the junction of the baffle 2023 and tray 202 forming a relief zone, the baffle 2023 being inclined at an angle of 45 ° in the horizontal direction.

Preferably, an annular gas distributor 4 is arranged below the catalyst bed 3 at the bottommost layer in the high-pressure reactor 1, gas enters from the inlet at the bottom end of the annular gas distributor 4, oxygen is conveyed upwards from the bottom end of the high-pressure reactor 1, the uniformity of gas-liquid reaction is remarkably improved, and the reaction rate is improved. The contact area of oxygen and the PMIDA liquid is optimized, the mass transfer is enhanced, the phenomenon of local overheating is reduced, the blocking of the catalyst bed layer 3 is prevented, and the stable proceeding of the reaction process is ensured.

The external strengthening unit 5 is arranged on the outer side of the high-pressure reactor 1 in the embodiment, the external strengthening unit 5 comprises a second strengthening reactor 501 and a third strengthening reactor 502, a communication pipeline 503 is arranged between the second strengthening reactor 501 and the third strengthening reactor 502, the communication pipeline 503 is connected with the internal strengthening unit 2, specifically, the second strengthening reactor 501 is arranged above the third strengthening reactor 502, and the communication pipeline 503 is connected with the first strengthening reactor 201.

The system for preparing glyphosate by oxidizing N- (phosphonomethyl) iminodiacetic acid in the embodiment further comprises a feeding unit and a separation and purification unit, wherein the feeding unit comprises a N- (phosphonomethyl) iminodiacetic acid storage tank 7, an oxygen storage tank 6 and a preheater 8, the inlet of the preheater 8 is connected with the N- (phosphonomethyl) iminodiacetic acid storage tank 7 to preheat the N- (phosphonomethyl) iminodiacetic acid, the outlet of the preheater 8 is connected with the inlet of the second strengthening reactor 501, and the oxygen storage tank 6 is connected with the inlet of the third strengthening reactor 502.

The separation and purification unit comprises a cooler 9, a separation tank 10 and a distillation crystallization tower 11 which are sequentially connected, and is connected with an outlet at the bottom end of the high-pressure reactor 1.

When the system for preparing the glyphosate by oxidizing N- (phosphonomethyl) iminodiacetic acid is practically applied, the system comprises the following process flows:

The method comprises the steps of taking N- (phosphonomethyl) iminodiacetic acid and oxygen out of a storage tank through a feeding unit, preheating the N- (phosphonomethyl) iminodiacetic acid through a preheater 8, enabling the preheated N- (phosphonomethyl) iminodiacetic acid to enter a second strengthening reactor 501, enabling oxygen from an oxygen storage tank 6 to enter a third strengthening reactor 502, crushing and dispersing oxygen and N- (phosphonomethyl) iminodiacetic acid liquid into micro bubbles through an external strengthening unit 5, enabling the micro bubbles to enter a high-pressure reactor 1 for reaction, enabling a product after the reaction to enter a separation and purification unit through an outlet at the bottom end of the high-pressure reactor 1, and obtaining a purified glyphosate product through cooling, separation, distillation and crystallization treatment.

Example 2

The present example differs from example 1 only in that the angle of inclination of the baffle is 10 °.

Example 3

The present example differs from example 1 only in that the angle of inclination of the baffle is 90 °.

Example 4

The present example differs from embodiment 1 only in that the guide hole has a diameter of 10mm.

Example 5

The present example differs from embodiment 1 only in that the direction of the pilot hole is a centripetal direction.

Comparative example 1

The present example differs from example 1 only in that no built-in reinforcing unit is provided.

Comparative example 2

The difference between this example and example 1 is only that no external reinforcing unit is provided.

Comparative example 3

The present example differs from example 1 only in that no annular gas distributor is provided.

Comparative example 4

In the embodiment, the prior art is adopted, and oxygen and N- (phosphonomethyl) iminodiacetic acid liquid are directly subjected to oxidation reaction to generate the glyphosate.

Experimental example 1

Glyphosate was prepared by the systems of examples 1-5 and comparative examples 1-3, respectively, using a flow of 500kg/h of N-phosphonomethyl iminodiacetic acid liquid from a plant, and a flow of 1500m3/h (under standard conditions) of oxygen, and reacted with a vanadium-based catalyst to produce glyphosate. Experimental data are as follows:

Table 1 experimental data

When the glyphosate is prepared in the prior art, the yield of the prepared glyphosate is 65%, the conversion rate of the N-phosphonomethyl iminodiacetic acid is about 72%, and the reaction time is 18 hours. As can be seen from Table 1, compared with the prior art, the yield of glyphosate and the conversion rate of PMIDA in each embodiment of the present utility model are significantly improved, the conversion rate of PMIDA in embodiment 1 is 99%, the raw material utilization rate is 99%, the yield of glyphosate is 95%, and the overall reaction time in embodiment 1 is significantly shortened, thereby saving the reaction energy consumption.

As can be seen from Table 1, the embodiment 1 of the present utility model is an optimal embodiment, the system of the present embodiment uses the built-in strengthening unit and the high pressure reactor in combination, the yield of the obtained glyphosate is significantly higher than that of the glyphosate synthesized in the prior art, and the reaction time is significantly shortened, which indicates that the optimal reaction effect can be achieved by adopting the cooperation arrangement mode of the built-in strengthening unit and the high pressure reactor of the embodiment 1, and the preparation system of the present embodiment 1 has the advantages of low reaction energy consumption and good preparation effect.

Among them, the yield of glyphosate of comparative example 1 is lower than that of example 1 because comparative example 1 is not provided with a built-in reinforcing unit, which cannot sufficiently crush and disperse and uniformly mix the reaction raw materials in the high-pressure reactor, and it can be seen that the yield and the raw material conversion rate of glyphosate are improved by providing a built-in reinforcing unit in the high-pressure reactor according to example 1 of the present utility model.

In a word, compared with the prior art, the glyphosate preparation system has high raw material conversion rate and high product yield, and is worthy of wide popularization and application.

It should be noted that the above embodiments are merely for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present utility model.

Claims (9)

1. A system for preparing glyphosate by N- (phosphonomethyl) iminodiacetic acid oxidation is characterized by comprising a high-pressure reactor and a built-in strengthening unit;

At least two catalyst beds are arranged in the high-pressure reactor, each catalyst bed is arranged below the liquid level in the high-pressure reactor, and a built-in strengthening unit is arranged between every two adjacent catalyst beds;

The built-in strengthening unit comprises a first strengthening reactor and a bearing disc arranged under the first strengthening reactor, wherein the bearing disc is of an inverted arc-shaped concave structure with a low center and a high edge, an accelerating area is arranged in the central area of the bearing disc, and the accelerating area is opposite to an outlet of the first strengthening reactor.

2. The system for preparing glyphosate by oxidation of N- (phosphonomethyl) iminodiacetic acid of claim 1, wherein a plurality of guide holes are uniformly distributed on the surface of the acceleration region, and Kong Xiang of the guide holes are in a centrifugal direction.

3. The system for preparing glyphosate by oxidation of N- (phosphonomethyl) iminodiacetic acid according to claim 2, wherein the guide holes have a diameter of 30-60 μm.

4. The system for preparing glyphosate by oxidation of N-phosphonomethyl iminodiacetic acid according to claim 1, wherein a deflector inclined outwards is arranged around the edge of the receiving tray, and a slow flow area is formed at the joint of the deflector and the receiving tray.

5. A system for preparing glyphosate by N- (phosphonomethyl) iminodiacetic acid oxidation according to claim 4, wherein the deflector is inclined at an angle of 30-60 ° in the horizontal direction.

6. A system for preparing glyphosate by N- (phosphonomethyl) iminodiacetic acid oxidation according to claim 4, wherein the deflector is inclined at an angle of 45 ° in the horizontal direction.

7. The system for preparing glyphosate by oxidation of N-phosphonomethyl iminodiacetic acid of claim 1, wherein an annular gas distributor is disposed below the bottom-most catalyst bed in the high-pressure reactor.

8. The system for preparing glyphosate by oxidation of N- (phosphonomethyl) iminodiacetic acid of claim 7, wherein an external strengthening unit is arranged outside the high-pressure reactor and comprises a second strengthening reactor and a third strengthening reactor, a communication pipeline is arranged between the second strengthening reactor and the third strengthening reactor, and the communication pipeline is connected with the internal strengthening unit.

9. A system for preparing glyphosate by oxidation of N-phosphonomethyl iminodiacetic acid as in claim 8, further comprising a feed unit and a separation and purification unit;

The feeding unit comprises a N-phosphonomethyl iminodiacetic acid storage tank, an oxygen storage tank and a preheater, wherein an inlet of the preheater is connected with the N-phosphonomethyl iminodiacetic acid storage tank to preheat the N-phosphonomethyl iminodiacetic acid;

The separation and purification unit comprises a cooler, a separation tank and a distillation crystallization tower which are sequentially connected, and is connected with an outlet at the bottom end of the high-pressure reactor.