Melamine mononitrate synthesizer

Abstract

The utility model relates to a melamine mononitrate synthesizer which comprises a first feeding assembly, a second feeding assembly and a third feeding assembly, a second feeding assembly; the reaction assembly comprises at least one group of reaction units communicated with the first material conveying pipe and the second material conveying pipe; each group of reaction units comprises a micro-channel reaction plate, reaction partition plates arranged on the two surfaces of the micro-channel reaction plate and heat exchange plates arranged on the outer surface of each reaction partition plate; the discharging assembly comprises a discharging pipe and a receiving tank; the discharging pipe is communicated with the reaction unit; the receiving tank is communicated with the discharging pipe; the micro-channel reaction plate is respectively communicated with the first conveying pipe, the second conveying pipe and the discharging pipe. The melamine mononitrate synthesis raw materials can be fully mixed, and the reaction temperature is kept, so that the reaction is fully performed, and the yield and the purity of the product can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of chemical equipment and relates to a microchannel reactor, in particular to a melamine mononitrate synthesis device. Background Art

[0002] Melamine nitrate, as a nitrating agent for electron-donating phenolic compounds, exhibits excellent chemoselectivity and regioselectivity. It is also environmentally friendly and can recycle industrial waste dilute nitric acid. Melamine nitrate is synthesized using melamine and dilute nitric acid as raw materials, reacting under certain conditions to produce melamine mononitrate, melamine dinitrate, and melamine trinitrate. However, the reaction of melamine and dilute nitric acid in existing reactors cannot ensure sufficient mixing of the raw materials and precise control of reaction conditions, resulting in products containing high levels of byproducts that fail to meet commercial purity requirements. Summary of the Invention

[0003] The utility model aims to provide a melamine mononitrate synthesis device in order to overcome the deficiencies of the prior art.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a melamine mononitrate synthesis device, which comprises:

[0005] a first material feeding assembly, the first material feeding assembly comprising a first raw material tank and a first material delivery pipe connected to the first raw material tank and equipped with a first material delivery pump;

[0006] a second material feeding assembly, the second material feeding assembly comprising a second raw material tank and a second material delivery pipe connected to the second raw material tank and equipped with a second material delivery pump;

[0007] A reaction assembly, the reaction assembly comprising at least one group of reaction units connected to the first feed pipe and the second feed pipe; each group of reaction units comprising a microchannel reaction plate, reaction baffles disposed on both surfaces of the microchannel reaction plate, and a heat exchange plate disposed on the outer surface of each reaction baffle;

[0008] A discharge assembly, the discharge assembly comprising a discharge pipe connected to the reaction unit and a receiving tank connected to the discharge pipe;

[0009] The microchannel reaction plate is respectively connected to the first material delivery pipe, the second material delivery pipe and the material discharge pipe.

[0010] Optimally, the microchannel reaction plate includes a plate body and a reaction microchannel opened in the plate body and extending in a winding manner, the reaction microchannel forms a first material inlet and a second material inlet that are connected on either side of the plate body and forms a material outlet on either side of the plate body, the first material delivery pipe is connected to the first material inlet, the second material delivery pipe is connected to the second material inlet, and the discharge pipe is connected to the material outlet.

[0011] Furthermore, the heat exchange plate includes a heat exchange plate body, a heat exchange channel opened in the heat exchange plate body and extending in a winding manner, and a heat exchange medium inlet and a heat exchange medium outlet formed on either side of the heat exchange plate body.

[0012] Optimally, there are multiple groups of reaction units, which are connected in series through reaction material pipelines.

[0013] Furthermore, it also includes a heat exchange medium feed pipe connected to each heat exchange plate, a heat exchange medium return pipe connected to each heat exchange plate, and a high and low temperature circulation machine connected to the heat exchange medium feed pipe and the heat exchange medium return pipe.

[0014] Furthermore, a flow regulating knob is installed at the connection between the heat exchange medium return pipe and each heat exchange plate.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the existing technology: the melamine mononitrate synthesis device of the present invention, by adopting a first feeding component, a second feeding component, a reaction component and a discharge component with a specific structure, can fully mix the melamine mononitrate synthesis raw materials, maintain the reaction temperature, and then fully react, which is beneficial to improving the yield and purity of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a melamine mononitrate synthesis device according to the present invention;

[0017] Figure 2 This is a schematic structural diagram of the reaction unit in the melamine mononitrate synthesis device of the present invention;

[0018] Figure 3 This is a cross-sectional view of a microchannel reaction plate in the melamine mononitrate synthesis device of the present invention;

[0019] Figure 4 This is a cross-sectional view of a heat exchange plate in the melamine mononitrate synthesis device of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0021] As shown in the melamine mononitrate synthesis device, mainly includes the first feeding assembly, second feeding assembly, reaction assembly and discharge assembly. Figure 1

[0022] The first feeding assembly includes a first raw material tank 1 and a first feeding pipe a connected with the first raw material tank 1 and provided with a first feeding pump 3, so that the flow of one raw material (such as a solution containing melamine) transported through the first feeding pipe a can be accurately controlled by installing the first feeding pump 3. Similarly, the second feeding assembly includes a second raw material tank 2 and a second feeding pipe b connected with the second raw material tank 2 and provided with a second feeding pump 4, so that the flow of another group of raw materials (such as nitric acid or nitric acid solution) transported through the second feeding pipe b can be accurately controlled.

[0023] The reaction assembly includes at least one group of reaction units 11 connected with the first feeding pipe a and the second feeding pipe b, for receiving the two materials and making them react chemically. As shown in the figure, each group of reaction units 11 includes a micro-channel reaction plate 111, a reaction partition plate 112 arranged on both surfaces of the micro-channel reaction plate 111, and a heat exchange plate 113 arranged on the outer surface of each reaction partition plate 112 (the channel reaction plate 111, the reaction partition plate 112 and the heat exchange plate 113 can be assembled together by conventional fasteners such as bolts, or directly compounded or bonded together). In this embodiment, the reaction unit 11 has multiple groups, and the specific number can be selected according to the yield, purity and economy of the product, and can be five groups, which can be connected in sequence by the reaction material pipe 9. Figure 2

[0024] As shown in the melamine mononitrate synthesis device, mainly includes the first feeding assembly, second feeding assembly, reaction assembly and discharge assembly. Figure 3 ​​As shown, the micro-channel reaction plate 111 comprises a plate body 1110 and a reaction micro-channel 1111 formed in the plate body 1110 and extending in a meandering manner (for example, the reaction micro-channel 1111 comprises a plurality of groups of micro-channel units arranged in an upper and lower manner and extending in a meandering manner, and a plurality of micro-channel connecting units connecting the two groups of micro-channel units in an end-to-end manner). The reaction micro-channel 1111 forms a first material inlet 1112 and a second material inlet 1113 on either side of the plate body 1110 and a material outlet 1114 on either side of the plate body 1110 (in this embodiment, the first material inlet 1112 and the second material inlet 1113 are on the same side of the plate body 1110, and the material outlet 1114 is on the other side of the plate body 1110). When the micro-channel reaction plate 111 is one, the first material pipe a is connected to the first material inlet 1112, the second material pipe b is connected to the second material inlet 1113, and the material outlet pipe 13 is connected to the material outlet 1114 (i.e., the micro-channel reaction plate 111 is connected to the first material pipe a, the second material pipe b and the material outlet pipe 13 in a communication manner). However, when the micro-channel reaction plate 111 is a plurality of plates, the first material pipe a and the second material pipe b are connected to the first material inlet 1112 and the second material inlet 1113 of the first micro-channel reaction plate 111 respectively, the material outlet pipe 13 is connected to the material outlet 1114 of the last micro-channel reaction plate 111, and the material outlet 1114 of the first micro-channel reaction plate 111 is connected to the first material inlet 1112 of the adjacent micro-channel reaction plate 111, and the process is repeated (in this case, the second material inlet 1113 of the adjacent micro-channel reaction plate 111 is closed, or additional addition of one of the reaction materials is added according to the proportion of the reaction materials). As shown in FIG. 1, the first material pipe a is connected to the first material inlet 1112 of the first micro-channel reaction plate 111, the second material pipe b is connected to the second material inlet 1113 of the first micro-channel reaction plate 111, and the material outlet pipe 13 is connected to the material outlet 1114 of the last micro-channel reaction plate 111. The material outlet 1114 of the first micro-channel reaction plate 111 is connected to the first material inlet 1112 of the second micro-channel reaction plate 111, and the process is repeated. Figure 4 As shown, the heat exchange plate 113 comprises a heat exchange plate body 1131, a heat exchange flow channel 1132 formed in the heat exchange plate body 1131 and extending in a meandering manner, and a heat exchange medium inlet 1133 and a heat exchange medium outlet 1134 formed on either side of the heat exchange plate body 1131. Since one micro-channel reaction plate 111 has two heat exchange plates 113, the two heat exchange plates 113 can be connected by pipes to have only one heat exchange medium inlet 1133 and one heat exchange medium outlet 1134 as a whole.

[0025] The material outlet assembly comprises a material outlet pipe 13 connected to the reaction unit 11 and a receiving tank 14 connected to the material outlet pipe 13 for receiving the product of the reaction assembly. By using the first material supply assembly, the second material supply assembly, the reaction assembly and the material outlet assembly with specific structures, the melamine mononitrate synthesis raw materials can be fully mixed, the reaction temperature can be maintained, and the reaction can be fully carried out, thereby improving the yield and purity of the product.

[0026] In the embodiment, the melamine mononitrate synthesis device further comprises a heat exchange medium feeding pipe 8 connected to each heat exchange plate 113, a heat exchange medium return pipe 10 connected to each heat exchange plate 113, and a high-low temperature circulating machine 15 connected to the heat exchange medium feeding pipe 8 and the heat exchange medium return pipe 10, so that the temperature control of multiple groups of reaction units 11 is simultaneously realized by using one high-low temperature circulating machine 15. Moreover, a flow adjusting knob 12 is installed at the connection between the heat exchange medium return pipe 10 and each heat exchange plate 113, so that the flow of the heat exchange medium of the corresponding reaction unit 11 is adjusted by using each flow adjusting knob 12, and then the temperature of each group of reaction units 11 is accurately controlled.

[0027] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A melamine mononitrate synthesis device, characterized in that: It includes: A first material supply assembly, comprising a first raw material tank (1) and a first material delivery pipe (a) connected to the first raw material tank (1) and equipped with a first material delivery pump (3); A second material supply assembly, the second material supply assembly comprising a second raw material tank (2) and a second material delivery pipe (b) connected to the second raw material tank (2) and equipped with a second material delivery pump (4); A reaction assembly, the reaction assembly comprising at least one group of reaction units (11) connected to the first feed pipe (a) and the second feed pipe (b); each group of the reaction units (11) comprises a microchannel reaction plate (111), reaction baffles (112) arranged on both surfaces of the microchannel reaction plate (111), and a heat exchange plate (113) arranged on the outer surface of each reaction baffle (112); A discharge assembly, the discharge assembly comprising a discharge pipe (13) connected to the reaction unit (11) and a receiving tank (14) connected to the discharge pipe (13); The microchannel reaction plate (111) is respectively connected to the first material delivery pipe (a), the second material delivery pipe (b) and the discharge pipe (13).

2. The melamine mononitrate synthesis device according to claim 1, characterized in that: The microchannel reaction plate (111) includes a plate body (1110) and a reaction microchannel (1111) opened in the plate body (1110) and extending in a winding manner. The reaction microchannel (1111) forms a first material inlet (1112) and a second material inlet (1113) that are interconnected on any side of the plate body (1110) and forms a material outlet (1114) on any side of the plate body (1110). The first material delivery pipe (a) is connected to the first material inlet (1112), the second material delivery pipe (b) is connected to the second material inlet (1113), and the discharge pipe (13) is connected to the material outlet (1114).

3. The melamine mononitrate synthesis device according to claim 1 or 2, characterized in that: The heat exchange plate (113) comprises a heat exchange plate body (1131), a heat exchange channel (1132) opened in the heat exchange plate body (1131) and extending in a winding manner, and a heat exchange medium inlet (1133) and a heat exchange medium outlet (1134) formed on either side of the heat exchange plate body (1131).

4. The melamine mononitrate synthesis device according to claim 1, characterized in that: The reaction units (11) are multiple groups, which are connected in series through the reaction material pipeline (9).

5. The melamine mononitrate synthesis device according to claim 4, characterized in that: It also includes a heat exchange medium feed pipe (8) connected to each of the heat exchange plates (113), a heat exchange medium return pipe (10) connected to each of the heat exchange plates (113), and a high and low temperature circulation machine (15) connected to the heat exchange medium feed pipe (8) and the heat exchange medium return pipe (10).

6. The melamine mononitrate synthesis device according to claim 5, characterized in that: A flow regulating knob (12) is installed at the connection between the heat exchange medium return pipe (10) and each heat exchange plate (113).

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