Amination reaction and separation system

Abstract

The utility model discloses an amination reaction and separation system. The amination reaction and separation system comprises a reaction unit (1) and a separation unit which are connected through a pipeline, the separation unit comprises an ammonia tower (2), a light component removal tower (3), a crude product tower (5), a fine product tower (6) and a wastewater tower (7) which are sequentially connected through pipelines; and the reaction unit is connected with the ammonia tower (2) through a pipeline. The utility model discloses a reaction and separation system for preparing nitrogen-containing chemicals through catalytic amination of oxygen-containing compounds, which can realize continuous operation of the production process of the nitrogen-containing chemicals to obtain qualified nitrogen-containing chemical products, can also recover ammonia and oxygen-containing compounds which are not completely reacted, realizes up-to-standard discharge of wastewater, saves raw materials, reduces energy consumption, and is suitable for industrial production. The production cost is reduced.

Description

Technical Field

[0001] The present application relates to an amination reaction and separation system, and belongs to the field of nitrogen-containing chemical production. Background Art

[0002] Tetrahydropyrrole is an important intermediate for fine chemicals and is widely used in organic synthesis, medicine, pesticides, coatings, daily chemicals and other fields.

[0003] Tetrahydropyrrole can be prepared from raw materials such as 1,4-butanediol, 1,4-succinonitrile, 1,4-butanediamine, and tetrahydrofuran. Among them, the synthesis of tetrahydropyrrole by catalytic amination of 1,4-butanediol and tetrahydrofuran has the advantages of simple reaction process, low raw material cost, and high atom utilization rate, and has high industrial application value.

[0004] Most existing production systems are intermittent operations with low raw material utilization and high energy consumption. Utility Model Content

[0005] The utility model aims to provide an amination reaction and separation system, which relates to a production system for preparing nitrogen-containing chemicals by catalytic amination of oxygen-containing compounds, including but not limited to the reaction processes of preparing tetrahydropyrrole by amination of tetrahydrofuran and preparing tetrahydropyrrole by amination of 1,4-butanediol, and the like, and is used to achieve high raw material utilization and low energy consumption production of target products.

[0006] In one aspect of the present application, a system for amination reaction and separation is provided.

[0007] The amination reaction and separation system comprises a reaction unit and a separation unit connected by a pipeline;

[0008] The separation unit includes an ammonia tower, a light removal tower, a crude product tower, a refined product tower, and a wastewater tower which are sequentially connected through pipelines;

[0009] The reaction unit is connected to the ammonia tower pipeline.

[0010] Optionally, the amination reaction and separation system further comprises a dryer;

[0011] The dryer is connected to the lightness removal tower and the reaction unit pipeline respectively.

[0012] Optionally, the reaction unit is provided with a reaction unit circulating material inlet;

[0013] An ammonia tower side sampling port is provided on the tower side of the ammonia tower;

[0014] The dryer is provided with a dryer outlet;

[0015] The side sampling port of the ammonia tower and the outlet of the dryer are respectively connected to the circulating material inlet pipeline of the reaction unit.

[0016] Optionally, the reaction unit is provided with a reaction unit extraction port;

[0017] The ammonia tower is provided with an ammonia tower feed port, which is connected to the reaction unit extraction port through a pipeline;

[0018] The ammonia tower is provided with an ammonia tower kettle liquid inlet, and the lightness removal tower is provided with a lightness removal tower feed inlet, and the ammonia tower kettle liquid inlet is connected to the lightness removal tower feed inlet through a pipeline;

[0019] The light-removal tower is provided with a light-removal tower kettle liquid inlet, and the crude product tower is provided with a crude product tower feed inlet, and the light-removal tower kettle liquid inlet is connected to the crude product tower feed inlet through a pipeline;

[0020] The crude product tower is provided with a crude product tower top fraction outlet and a crude product tower bottom liquid outlet;

[0021] The refined product tower is provided with a refined product tower feed port, which is connected to the top fraction port of the crude product tower through a pipeline, and the refined product tower is also provided with a refined product tower bottom liquid port;

[0022] The wastewater tower is provided with a wastewater tower feed port, which is respectively connected with the crude product tower bottom liquid port and the refined product tower bottom liquid port through pipelines.

[0023] Optionally, the ammonia tower is provided with an ammonia tower top fraction outlet;

[0024] The refined product tower is provided with a refined product tower top distillate outlet;

[0025] The wastewater tower is provided with a wastewater tower top distillate outlet and a wastewater tower bottom liquid outlet.

[0026] Optionally, the dryer is provided with a dryer inlet;

[0027] The light-removal tower is provided with a light-removal tower top fraction outlet;

[0028] The top fraction outlet of the light removal tower is connected to the inlet of the dryer through a pipeline.

[0029] The beneficial effects of this application include:

[0030] The utility model discloses an amination reaction and separation system, which can realize continuous operation of the production process of target products such as tetrahydropyrrole, obtain qualified products such as tetrahydropyrrole, and can also recycle incomplete raw materials and by-products, realize wastewater discharge that meets standards, save raw materials, improve device production efficiency, reduce separation energy consumption, and thus reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of an amination reaction and separation system of the present application.

[0032] in:

[0033] 1-reaction unit, 2-ammonia tower, 3-light removal tower, 4-dryer, 5-crude product tower, 6-fine product tower, 7-wastewater tower;

[0034] 11-reaction unit circulating material inlet, 12-reaction unit extraction outlet;

[0035] 21- ammonia tower feed port, 22- ammonia tower overhead fraction port, 23- ammonia tower side extraction port, 24- ammonia tower kettle liquid port;

[0036] 31-feed port of lightness removal tower, 32-top fraction port of lightness removal tower, 33-liquid port of bottom fraction of lightness removal tower;

[0037] 41-dryer inlet, 42-dryer outlet;

[0038] 51-feed port of crude product tower, 52-top fraction port of crude product tower, 53-liquid port of crude product tower bottom;

[0039] 61-feed port of refined product tower, 62-top fraction port of refined product tower, 63-bottom liquid port of refined product tower; 71-feed port of wastewater tower, 72-top fraction port of wastewater tower, 73-bottom liquid port of wastewater tower. DETAILED DESCRIPTION

[0040] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0041] Figure 1 This is a simplified process flow chart, which mainly describes the connection relationship between equipment. The top condenser, bottom reboiler, heat exchanger, pump, automatic control system, etc. required for the distillation tower are not reflected.

[0042] Example 1

[0043] like Figure 1 The amination reaction and separation system shown is used for the tetrahydropyrrole reaction and separation process, and includes a reaction unit 1, an ammonia tower 2, a light removal tower 3, a dryer 4, a crude product tower 5, a refined product tower 6 and a wastewater tower 7 that are interconnected.

[0044] The ammonia tower 2 is provided with an ammonia tower feed inlet 21, an ammonia tower top fraction inlet 22, an ammonia tower bottom liquid inlet 24, and an ammonia tower side sampling inlet 23; the light removal tower 3 is provided with a light removal tower feed inlet 31, a light removal tower top fraction inlet 32, and a light removal tower bottom liquid inlet 33; the crude product tower 5 is provided with a crude product tower feed inlet 51, a crude product tower top fraction inlet 52, and a crude product tower bottom liquid inlet 53; the refined product tower 6 is provided with a refined product tower feed inlet 61, a refined product tower top fraction inlet 62, and a refined product tower bottom liquid inlet 63; the wastewater tower 7 is provided with a wastewater tower feed inlet 71, a wastewater tower top fraction inlet 72, and a wastewater tower bottom liquid inlet 73; the reaction unit 1 is provided with a reaction unit circulating material inlet 11 and a reaction unit sampling inlet 12; the dryer 4 is provided with a dryer inlet 41 and a dryer outlet 42.

[0045] The ammonia tower side production port 23 is connected to the reaction unit circulating material inlet 11 through a pipeline, and the ammonia tower bottom liquid port 24 is connected to the light removal tower feed port 31 through a pipeline; the light removal tower top fraction port 32 is connected to the dryer inlet 41 through a pipeline, and the light removal tower bottom liquid port 33 is connected to the crude product tower feed port 51 through a pipeline; the dryer outlet 42 produces water-free tetrahydrofuran and is connected to the reaction unit circulating material inlet 11 through a pipeline; the crude product tower top fraction port 52 is connected to the refined product tower feed port 61 through a pipeline, and the crude product tower bottom liquid port 53 is connected to the dehydration tower feed port 71 through a pipeline; the refined product tower bottom liquid port 63 is connected to the dehydration tower feed port 71 through a pipeline; the reaction system production port 12 is connected to the ammonia tower feed port 21 through a pipeline;

[0046] The raw materials (tetrahydrofuran and ammonia) and the circulating materials (tetrahydrofuran and ammonia) are contacted and reacted with the molecular sieve catalyst (ZSM-5, ZSM-11 or the eutectic of the two) in the reaction unit 1, and the reaction product enters the ammonia tower 2 through the ammonia tower feed port 21. The light components such as the non-condensable gas entrained in the product are extracted from the ammonia tower top fraction port 21 and discharged into the flare gas network. The relatively pure ammonia is extracted from the ammonia tower side extraction port 24 and returned to the reaction unit through the reaction unit circulating material inlet 11;

[0047] The mixed material extracted from the liquid outlet 24 of the ammonia tower kettle enters the lightness removal tower 3 through the lightness removal tower feed inlet 31, and the high-purity tetrahydrofuran is extracted from the lightness removal tower top fraction outlet 32 ​​and enters the dryer through the dryer inlet 41. The dried and dehydrated tetrahydrofuran is extracted from the dryer outlet 42 and returned to the reaction unit through the reaction unit circulating material inlet 11;

[0048] The mixed material taken out from the liquid outlet 33 of the light removal tower enters the crude product tower 5 through the crude product tower feed inlet 51, and the crude tetrahydropyrrole product is taken out from the crude product tower top fraction outlet 52, and enters the refined product tower 6 through the refined product tower feed inlet 61, and the tetrahydropyrrole product is taken out from the refined product tower top fraction outlet 62 and sent to the tank area for storage;

[0049] The heavy components extracted from the crude product tower bottom liquid port 53 and the heavy components extracted from the refined product tower bottom liquid port 63 enter the wastewater tower 7 through the wastewater tower feed port 71. The four by-products are extracted from the wastewater tower top distillate port 72 and sent to the tank area for storage. Qualified wastewater is extracted from the wastewater tower bottom liquid port 73 and sent to the waterless treatment system.

[0050] The utility model discloses an amination reaction and separation system, which can realize the continuous operation of the tetrahydropyrrole production process, obtain qualified tetrahydropyrrole products, and can also recycle incomplete raw materials and by-products, thereby achieving wastewater discharge that meets standards, saving raw materials, improving the production efficiency of the device, reducing separation energy consumption, and thus reducing production costs.

[0051] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. An amination reaction and separation system, characterized in that: The amination reaction and separation system comprises a reaction unit (1) and a separation unit connected by a pipeline; The separation unit comprises an ammonia tower (2), a light removal tower (3), a crude product tower (5), a refined product tower (6), and a wastewater tower (7) which are sequentially connected through pipelines; The reaction unit is connected to the ammonia tower (2) pipeline.

2. The amination reaction and separation system according to claim 1, characterized in that: The amination reaction and separation system further comprises a dryer (4); The dryer (4) is respectively connected to the lightness removal tower (3) and the reaction unit (1) through pipelines.

3. The amination reaction and separation system according to claim 2, characterized in that: The reaction unit (1) is provided with a reaction unit circulating material inlet (11); An ammonia tower side sampling port (23) is provided on the tower side of the ammonia tower (2); The dryer (4) is provided with a dryer outlet (42); The ammonia tower side sampling port (23) and the dryer outlet (42) are respectively connected to the reaction unit circulating material inlet (11) pipeline.

4. The amination reaction and separation system according to claim 1, characterized in that: The reaction unit (1) is provided with a reaction unit extraction port (12); The ammonia tower (2) is provided with an ammonia tower feed port (21), which is connected to the reaction unit extraction port (12) via a pipeline; The ammonia tower (2) is provided with an ammonia tower kettle liquid inlet (24), and the lightness removal tower (3) is provided with a lightness removal tower feed inlet (31), and the ammonia tower kettle liquid inlet (24) is connected to the lightness removal tower feed inlet (31) via a pipeline; The light-removal tower (3) is provided with a light-removal tower kettle liquid inlet (33), and the crude product tower (5) is provided with a crude product tower feed inlet (51), and the light-removal tower kettle liquid inlet (33) is connected to the crude product tower feed inlet (51) via a pipeline; The crude product tower (5) is provided with a crude product tower top fraction outlet (52) and a crude product tower bottom liquid outlet (53); The refined product tower (6) is provided with a refined product tower feed port (61), which is connected to the crude product tower top fraction port (52) via a pipeline, and the refined product tower (6) is also provided with a refined product tower bottom liquid port (63); The wastewater tower (7) is provided with a wastewater tower feed port (71), which is connected to the crude product tower bottom liquid port (53) and the refined product tower bottom liquid port (63) through pipelines.

5. The amination reaction and separation system according to claim 1, characterized in that: The ammonia tower (2) is provided with an ammonia tower top fraction outlet (22); The refined product tower (6) is provided with a refined product tower top fraction outlet (62); The wastewater tower (7) is provided with a wastewater tower top distillate outlet (72) and a wastewater tower bottom liquid outlet (73).

6. The amination reaction and separation system according to claim 2, characterized in that: The dryer (4) is provided with a dryer inlet (41); The light-removal tower (3) is provided with a light-removal tower top fraction outlet (32); The light removal tower top fraction outlet (32) is connected to the dryer inlet (41) via a pipeline.

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