Static mixer for methylamine synthesis

Abstract

The utility model discloses a static mixer for methylamine synthesis. The static mixer comprises a feeding assembly, a first-stage shunting and mixing assembly and a second-stage preheating and mixing assembly, an outlet of the first-stage shunting and mixing assembly is connected with an inlet of the second-stage preheating and mixing assembly to form a plurality of groups of gas-liquid mixing assemblies, an outlet of the feeding assembly is sequentially connected with the plurality of groups of gas-liquid mixing assemblies, and an outlet of the last second-stage preheating and mixing assembly is an outlet of the static mixer for methylamine synthesis. The mixer realizes efficient mixing of methanol and ammonia through reasonable structural design, improves the reaction efficiency and yield of methylamine synthesis, reduces energy consumption, and is compact in structure, safe, reliable and suitable for industrial large-scale production.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of chemical equipment, especially a static mixer for methylamine synthesis. BACKGROUND

[0002] In chemical production, methylamine synthesis is an important reaction process, which involves the mixing reaction of methanol and ammonia to generate methylamine. Traditional methylamine synthesis process usually uses dynamic agitator or static mixer to realize gas-liquid mixing. However, dynamic agitator has high energy consumption, complex maintenance and low reaction efficiency. Although static mixer has lower energy consumption, the mixing efficiency and uniformity often cannot meet the needs of industrial production. Therefore, developing a new type of static mixer for methylamine synthesis aims to improve mixing efficiency, reduce energy consumption and increase methylamine yield, which is a technical problem to be solved in the field of chemical industry. SUMMARY

[0003] The utility model aims to provide a static mixer for methylamine synthesis.

[0004] To achieve the above-mentioned purpose, the utility model is implemented according to the following technical solutions:

[0005] The utility model includes feed assembly, primary shunt mixing assembly and secondary preheating mixing assembly, the outlet of the primary shunt mixing assembly is connected with the inlet of the secondary preheating mixing assembly to constitute a gas-liquid mixing assembly, the gas-liquid mixing assembly is multiple, the outlet of the feed assembly is connected with multiple gas-liquid mixing assemblies in turn, and the outlet of the last secondary preheating mixing assembly is the outlet of the static mixer for methylamine synthesis.

[0006] Further, the feed assembly includes feed bin, methanol liquid inlet reducing pipe and ammonia gas inlet reducing pipe, one end of the feed bin is connected with the methanol liquid inlet reducing pipe, the outlet of the methanol liquid inlet reducing pipe is located in the middle of the feed bin, the other end of the feed bin is connected with the primary shunt mixing assembly, the outlet end of the ammonia gas inlet reducing pipe penetrates from the side of the feed bin and is located in the feed bin, and the outlet end of the ammonia gas inlet reducing pipe is close to the outlet end of the methanol liquid inlet reducing pipe.

[0007] Specifically, the primary shunt mixing assembly includes a gas-liquid primary mixing chamber, gas-liquid mixing chamber discharge pipes, and a primary mixing chamber shunt cone, one end of the gas-liquid primary mixing chamber is open, the primary mixing chamber shunt cone is arranged in the middle of the gas-liquid primary mixing chamber, the inner wall of the gas-liquid primary mixing chamber is a gas-liquid mixing chamber inner arc, the gas-liquid mixing chamber inner arc is an annular structure, a plurality of gas-liquid mixing chamber discharge pipes are uniformly arranged at the edge of the other end of the gas-liquid primary mixing chamber and the edge position connected with the primary mixing chamber shunt cone, and one end of the gas-liquid mixing chamber discharge pipe arranged in the gas-liquid primary mixing chamber is connected with the secondary preheating mixing assembly.

[0008] The secondary preheating mixing assembly includes a gas-liquid preheating mixing chamber, electric heating pipes, and electric heating pipe radiating fins, the inner wall of the gas-liquid preheating mixing chamber is provided with a preheating mixing chamber curved surface, the preheating mixing chamber curved surface is an annular structure, the electric heating pipes are a plurality of, the electric heating pipe radiating fins are a plurality of, a plurality of electric heating pipes pass through a plurality of electric heating pipe radiating fins to form an annular structure, the electric heating pipes and the electric heating pipe radiating fins are located in the preheating mixing chamber curved surface, the preheating mixing chamber outlet is arranged in the middle of the gas-liquid preheating mixing chamber, one end of the gas-liquid preheating mixing chamber is connected with the outlet of the gas-liquid primary mixing chamber, and the other end of the gas-liquid preheating mixing chamber is connected with the inlet of another gas-liquid primary mixing chamber.

[0009] Preferably, the outlet end of the last gas-liquid preheating mixing chamber is connected with a mixture discharge pipe.

[0010] The beneficial effects of the utility model are as follows:

[0011] Compared with the prior art, the utility model realizes the following beneficial effects:

[0012] Improve mixing efficiency: through the reasonable design of the feeding assembly, the primary shunt mixing assembly and the secondary preheating mixing assembly, the efficient mixing of methanol and ammonia is realized, and the reaction efficiency of methylamine synthesis is improved.

[0013] Reduce energy consumption: the static mixer is used instead of the dynamic stirrer, the energy consumption is reduced, and the production cost is reduced.

[0014] Improve the yield of methylamine: through the multiple preheating and mixing process, the gas-liquid is fully mixed, and the yield and purity of methylamine are improved.

[0015] Compact structure: the overall design is compact, convenient to install and maintain, and suitable for industrial large-scale production. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a cross-sectional structure schematic view of the utility model;

[0017] Figure 2 It is the external structure schematic diagram of the utility model.

[0018] In the figure: feed bin 1, methanol liquid inlet reducing pipe 2, ammonia gas inlet reducing pipe 3, gas-liquid primary mixing bin 4, gas-liquid mixing bin inner arc part 5, gas-liquid mixing bin discharge pipe 6, gas-liquid preheating mixing bin 7, preheating mixing bin curved surface part 8, preheating mixing bin outlet 9, electric heating pipe 10, electric heating pipe cooling fin 11, mixture discharge pipe 12, primary mixing bin shunt cone part 13. DETAILED DESCRIPTION

[0019] The utility model will be further described below in combination with the drawings and specific embodiments, the schematic embodiment of the utility model and the description are used to explain the utility model, but not as the limitation of the utility model.

[0020] As Figure 1 And 2 The utility model discloses a methanamine synthesis device, which comprises a feed assembly, a primary shunt mixing assembly and a secondary preheating mixing assembly, the outlet of the primary shunt mixing assembly is connected with the inlet of the secondary preheating mixing assembly to form a gas-liquid mixing assembly, the gas-liquid mixing assembly is multiple groups, the outlet of the feed assembly is sequentially connected with the multiple groups of gas-liquid mixing assemblies, and the outlet of the last secondary preheating mixing assembly is the outlet of the static mixer for methanamine synthesis.

[0021] The feed assembly comprises a feed bin 1, a methanol liquid inlet reducing pipe 2 and an ammonia gas inlet reducing pipe 3, one end of the feed bin 1 is connected with the methanol liquid inlet reducing pipe 2, the outlet of the methanol liquid inlet reducing pipe 2 is located in the middle of the feed bin 1, the other end of the feed bin 1 is connected with the primary shunt mixing assembly, and the outlet end of the ammonia gas inlet reducing pipe 3 penetrates through the side of the feed bin 1 and is located in the feed bin 1, and the outlet end of the ammonia gas inlet reducing pipe 3 is close to the outlet end of the methanol liquid inlet reducing pipe 2. Methanol is sprayed into the feed bin through the methanol liquid inlet reducing pipe, and at the same time, ammonia is sprayed into the feed bin through the ammonia gas inlet reducing pipe. The outlet of the ammonia gas inlet reducing pipe is close to the outlet of the methanol liquid inlet reducing pipe, so that ammonia and methanol are preliminarily sprayed to the tip position of the primary mixing bin shunt cone part in a downstream manner, the gas-liquid is diffused to the surrounding, and preliminary mixing is realized.

[0022] The primary flow distribution and mixing assembly comprises a gas-liquid primary mixing bin 4, a gas-liquid mixing bin discharge pipe 6 and a primary mixing bin flow distribution cone 13, the gas-liquid primary mixing bin 4 is open at one end, the primary mixing bin flow distribution cone 13 is arranged in the middle of the gas-liquid primary mixing bin 4, the inner wall of the gas-liquid primary mixing bin 4 is a gas-liquid mixing bin inner arc 5, the gas-liquid mixing bin inner arc 5 is an annular structure, a plurality of gas-liquid mixing bin discharge pipes 6 are uniformly arranged at the edge of the other end of the gas-liquid primary mixing bin 4 and the edge position connected with the primary mixing bin flow distribution cone 13, and one end of the gas-liquid mixing bin discharge pipe 6 is connected with the secondary preheating and mixing assembly. The gas-liquid generates a reversed vortex flow at the primary mixing bin flow distribution cone, so that the gas-liquid is fully mixed. With the entry of the gas and the liquid, pressure is generated in the inside of the feeding bin, the gas-liquid is sprayed from the position of the gas-liquid mixing bin discharge pipe and enters the next mixing assembly.

[0023] The secondary preheating and mixing assembly comprises a gas-liquid preheating and mixing bin 7, an electric heating pipe 10 and an electric heating pipe heat dissipation fin 11, the inner wall of the gas-liquid preheating and mixing bin 7 is provided with a preheating and mixing bin curved surface 8, the preheating and mixing bin curved surface 8 is an annular structure, the electric heating pipe 10 is a plurality of, the electric heating pipe heat dissipation fin 11 is a plurality of, a plurality of electric heating pipes 10 pass through a plurality of electric heating pipe heat dissipation fins 11 to form an annular structure, the electric heating pipe 10 and the electric heating pipe heat dissipation fin 11 are located in the preheating and mixing bin curved surface 8, a preheating and mixing bin outlet 9 is arranged in the middle of the gas-liquid preheating and mixing bin 7, one end of the gas-liquid preheating and mixing bin 7 is connected with the outlet of the gas-liquid primary mixing bin 4, and the other end of the gas-liquid preheating and mixing bin 7 is connected with the inlet of another gas-liquid primary mixing bin 4. The gas-liquid is sprayed into the preheating and mixing bin curved surface edge of the gas-liquid preheating and mixing bin from the gas-liquid mixing bin discharge pipe, and due to the fact that the position of the preheating and mixing bin curved surface is also an annular arc structure, the gas-liquid is mixed again by generating a vortex flow. At the same time, the electric heating pipe is powered to heat the electric heating pipe heat dissipation fin, so that the gas-liquid being reversed and mixed in the preheating and mixing bin curved surface is preheated.

[0024] Preferably, the outlet end of the last gas-liquid preheating and mixing bin 7 is connected with a mixture discharge pipe 12. After the preheating and mixing process for multiple times, the gas-liquid mixture is discharged from the preheating and mixing bin outlet, enters the primary mixing bin flow distribution cone position of the next gas-liquid primary mixing bin again to be diffused and distributed, and the above process is repeated for multiple times, so that the gas-liquid is fully preheated and mixed, and finally discharged through the mixture discharge pipe to a deamination tower, an extraction tower, a dehydration tower, a separation tower and the like to perform other processes. The design ensures that the gas-liquid is fully mixed and preheated, and improves the reaction efficiency and yield of the methylamine synthesis.

[0025] The working principle of the utility model is as follows:

[0026] The utility model discloses when using, methanol feed device and methanol liquid inlet reducing pipe 2 butt joint, through the variable diameter export of methanol liquid inlet reducing pipe 2 and spray into feed bin 1, simultaneously, ammonia gas inlet reducing pipe 3 connects ammonia gas feed device, and export sprays into feed bin 1, and the export of ammonia gas inlet reducing pipe 3 is close to the export of methanol liquid inlet reducing pipe 2, makes ammonia gas and alcohol preliminary downstream and sprays to the tip position of primary mixing bin shunt cone part 13, makes gas-liquid spread to the surrounding, when gas-liquid is in the position of arc part 5 in gas-liquid mixing bin, produces a overturning spiral flow, makes gas-liquid fully mix, with the entry of gas and liquid, the inside of feed bin 1 can produce pressure, and gas-liquid sprays from the position of gas-liquid mixing bin discharge pipe 6, enters the edge of preheating mixing bin camber part 8 of gas-liquid preheating mixing bin 7, because the position of preheating mixing bin camber part 8 is also annular arc structure, can produce spiral flow and mix again, and simultaneously electric heating pipe 10 is electrified and heats up electric heating pipe fin 11, and the gas-liquid that is mixing in preheating mixing bin camber part 8 is preheated, and then gas-liquid mixture is discharged from preheating mixing bin export 9, and enters the primary mixing bin shunt cone part 13 position of next gas-liquid primary mixing bin 4 again and spreads shunt, repeats the above process multiple times, makes gas-liquid fully preheats and mixes, finally discharges to ammonia removal tower, extraction tower, dehydration tower, separation tower and other processes through mixture discharge pipe 12.

[0027] The above shows and describes the basic principle and main features of the utility model and the advantages of the present application. Those skilled in the art should understand that the utility model is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and

[0028] The description in the specification only illustrates the principle of the utility model, and various changes and improvements can be made without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A static mixer for methylamine synthesis, characterized in that: It includes a feed assembly, a primary diversion mixing assembly, and a secondary preheating mixing assembly. The outlet of the primary diversion mixing assembly is connected to the inlet of the secondary preheating mixing assembly to form a gas-liquid mixing assembly. There are multiple gas-liquid mixing assemblies. The outlet of the feed assembly is sequentially connected to multiple gas-liquid mixing assemblies. The outlet of the last secondary preheating mixing assembly is the outlet of the static mixer for methylamine synthesis.

2. The static mixer for methylamine synthesis according to claim 1, characterized in that: The feeding assembly includes a feeding bin (1), a methanol liquid inlet constriction pipe (2), and an ammonia gas inlet constriction pipe (3). One end of the feeding bin (1) is connected to the methanol liquid inlet constriction pipe (2), and the outlet of the methanol liquid inlet constriction pipe (2) is located in the middle of the feeding bin (1). The other end of the feeding bin (1) is connected to the primary diversion mixing assembly. The outlet end of the ammonia gas inlet constriction pipe (3) passes through the side of the feeding bin (1) and is located inside the feeding bin (1). The outlet end of the ammonia gas inlet constriction pipe (3) is close to the outlet end of the methanol liquid inlet constriction pipe (2).

3. The static mixer for methylamine synthesis according to claim 2, characterized in that: The primary flow mixing assembly includes a gas-liquid primary mixing chamber (4), a gas-liquid mixing chamber discharge pipe (6), and a primary mixing chamber flow divider cone (13). One end of the gas-liquid primary mixing chamber (4) is open. The primary mixing chamber flow divider cone (13) is located in the middle of the gas-liquid primary mixing chamber (4). The inner wall of the gas-liquid primary mixing chamber (4) is a gas-liquid mixing chamber inner arc (5). The gas-liquid mixing chamber inner arc (5) has an annular structure. Multiple gas-liquid mixing chamber discharge pipes (6) are evenly distributed at the other end edge of the gas-liquid primary mixing chamber (4) and the edge position connected to the primary mixing chamber flow divider cone (13). One end of the gas-liquid primary mixing chamber (4) with the gas-liquid mixing chamber discharge pipe (6) is connected to the secondary preheating mixing assembly.

4. The static mixer for methylamine synthesis according to claim 3, characterized in that: The secondary preheating mixing assembly includes a gas-liquid preheating mixing chamber (7), an electric heating tube (10), and an electric heating tube heat sink (11). The inner wall of the gas-liquid preheating mixing chamber (7) is provided with a preheating mixing chamber curved surface (8), which is a ring structure. There are multiple electric heating tubes (10) and multiple electric heating tube heat sinks (11). The multiple electric heating tubes (10) pass through the multiple electric heating tube heat sinks (11) to form a ring structure. The electric heating tubes (10) and the electric heating tube heat sinks (11) are located inside the preheating mixing chamber curved surface (8). The preheating mixing chamber outlet (9) is located in the middle of the gas-liquid preheating mixing chamber (7). One end of the gas-liquid preheating mixing chamber (7) is connected to the outlet of the gas-liquid primary mixing chamber (4), and the other end of the gas-liquid preheating mixing chamber (7) is connected to the inlet of another gas-liquid primary mixing chamber (4).

5. The static mixer for methylamine synthesis according to claim 4, characterized in that: The outlet end of the last gas-liquid preheating mixing chamber (7) is connected to a mixture discharge pipe (12).

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