Discharging system of adsorption tower

Abstract

The utility model provides a discharging system of an adsorption tower. A reforming pipeline is sequentially connected with a reforming reaction device, a xylene tower, a feeding tank and an adsorption separation tower; pre-hydrogenated naphtha is input into an inlet of the reforming pipeline, and an outlet of the reforming pipeline is connected with an inlet of the adsorption separation tower; a first outlet of the adsorption separation tower is connected with an inlet of a raffinate pipeline, and an outlet of the raffinate pipeline is connected with a second inlet of the raffinate liquid tower; a tower top outlet of the raffinate tower is connected with an inlet of a raffinate tower top condensation line, an outlet of the raffinate tower top condensation line is connected with an inlet of a reflux pump, and a raffinate reflux tank is arranged on the raffinate tower top condensation line; an outlet of the reflux pump is connected with an inlet of a raffinate tower reflux line, and an outlet of the raffinate tower reflux line is connected with a first inlet of the raffinate tower; the outlet of the reflux pump is also connected with the inlet of an invalid component leading-out pipeline, and the outlet of the invalid component leading-out pipeline is connected to the reforming pipeline; the impurity content can be effectively reduced, the invalid cycle is reduced, the energy consumption is reduced, and the productivity is increased.

Description

Technical Field

[0001] This utility model belongs to the field of chemical technology, specifically an adsorption tower discharge system. Background Technology

[0002] As the core technology of adsorption separation, the adsorption tower plays a crucial role in the production of paraxylene. During the operation of the adsorption tower, the requirements for the feed components are very strict. The effective component is C8A. However, since the purchased reformate inevitably contains C9N, C9P, etc., which have boiling points close to C8A, they cannot be completely separated by the upstream distillation system. This situation will cause the continuous accumulation of impurities such as C9N and C9P in the adsorption separation unit, resulting in the continuous circulation of ineffective components in the system, causing unnecessary energy consumption losses, and affecting the production capacity of the unit. Utility Model Content

[0003] In view of the above problems, the purpose of this application is to provide an adsorption tower discharge system that allows the material to be recycled back to the reforming unit for further reaction by drawing a line from the top reflux tank of the residual liquid tower (where impurities such as C9N and C9P are mainly concentrated), thereby reducing the ineffective components in the adsorption unit system.

[0004] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: an adsorption tower discharge system, characterized in that it includes a raffinate tower, a reforming pipeline, a raffinate pipeline, a condensate line at the top of the raffinate tower, a pipeline for discharging ineffective components, and a raffinate tower reflux line; the reforming pipeline is sequentially connected to a reforming reactor, a xylene tower, a feed tank, and an adsorption separation tower; the inlet of the reforming pipeline receives pre-hydrogenated naphtha, and the outlet of the reforming pipeline is connected to the inlet of the adsorption separation tower; the first outlet of the adsorption separation tower is connected to the raffinate pipeline. The inlet of the raffinate pipeline is connected to the second inlet of the raffinate tower; the top outlet of the raffinate tower is connected to the inlet of the top condenser line of the raffinate tower, and the outlet of the top condenser line of the raffinate tower is connected to the inlet of the reflux pump; a raffinate reflux tank is installed on the top condenser line of the raffinate tower; the outlet of the reflux pump is connected to the inlet of the reflux line of the raffinate tower, and the outlet of the reflux line of the raffinate tower is connected to the first inlet of the raffinate tower; the outlet of the reflux pump is also connected to the inlet of the ineffective component discharge pipeline, and the outlet of the ineffective component discharge pipeline is connected to the reforming pipeline.

[0005] Furthermore, the second outlet of the adsorption separation tower is connected to the inlet of the extraction pipeline, the outlet of the extraction pipeline outputs PX product, and the extraction pipeline is sequentially connected to the extraction liquid tower and the PX product tower.

[0006] Furthermore, the second outlet of the raffinate tower is connected to the inlet of the second pipeline of the raffinate tower, the outlet of the second pipeline of the raffinate tower is connected to the second inlet of the xylene tower, and an isomerization reaction device is installed on the xylene tower.

[0007] Furthermore, an adsorption tower feed pump is installed on the reforming pipeline, and the adsorption tower feed pump is connected between the feed tank and the adsorption separation tower.

[0008] Compared with the prior art, the beneficial effects of this utility model are: the material with the highest concentration of ineffective components is introduced to the reforming reaction through modification, so that C9N and C9P can be reacted into aromatics or cracked, thereby reducing the ineffective components in the system; by introducing a line from the top reflux tank of the evacuation tank (where impurities such as C9N and C9P are mainly concentrated), this part of the material is recycled back to the reforming unit for further reaction, thereby reducing the ineffective components in the adsorption unit system. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] In the diagram: 1. Reforming reactor; 2. Xylene tower; 3. Feed tank; 4. Adsorption separation tower; 5. Raffinate tower; 6. Raffinate reflux tank; 7. Reflux pump; 8. Isomerization reactor; 9. Extraction tower; 10. PX product tower; 11. Reforming line; 12. Raffinate tower top condensate line; 13. Ineffective component removal line; 14. Raffinate tower reflux line; 15. Extraction line; 16. Raffinate line; 17. Raffinate tower No. 2 line; 18. Adsorption tower feed pump. Detailed Implementation

[0011] To make the structure and function of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0012] See appendix Figure 1An adsorption tower discharge system includes a raffinate tower 5, a reforming pipeline 11, a raffinate pipeline 16, a raffinate tower top condensate line 12, an ineffective component discharge line 13, and a raffinate tower reflux line 14. The reforming pipeline 11 is sequentially connected to a reforming reactor 1, a xylene tower 2, a feed tank 3, and an adsorption separation tower 4. The inlet of the reforming pipeline 11 receives pre-hydrogenated naphtha, and the outlet of the reforming pipeline 11 is connected to the inlet of the adsorption separation tower 4. The first outlet of the adsorption separation tower 4 is connected to the inlet of the raffinate pipeline 16, and the outlet of the raffinate pipeline 16 is connected to the raffinate... The second inlet of the liquid tower 5; the top outlet of the raffinate tower 5 is connected to the inlet of the raffinate tower top condenser line 12, the outlet of the raffinate tower top condenser line 12 is connected to the inlet of the reflux pump 7, and a raffinate reflux tank 6 is installed on the raffinate tower top condenser line 12; the outlet of the reflux pump 7 is connected to the inlet of the raffinate tower reflux line 14, and the outlet of the raffinate tower reflux line 14 is connected to the first inlet of the raffinate tower 5; the outlet of the reflux pump 7 is also connected to the inlet of the ineffective component discharge line 13, and the outlet of the ineffective component discharge line 13 is connected to the reforming line 11.

[0013] The second outlet of the adsorption separation tower 4 is connected to the inlet of the extraction pipeline 15, and the outlet of the extraction pipeline 15 outputs PX product. The extraction pipeline 15 is connected in sequence to the extraction liquid tower 9 and the PX product tower 10.

[0014] The second outlet of the raffinate tower 5 is connected to the inlet of the second pipeline 17 of the raffinate tower, and the outlet of the second pipeline 17 of the raffinate tower is connected to the second inlet of the xylene tower 2. The xylene tower 2 is equipped with an isomerization reaction device 8.

[0015] An adsorption tower feed pump 18 is installed on the reforming pipeline 11, and the adsorption tower feed pump 18 is connected between the feed tank 3 and the adsorption separation tower 4.

[0016] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. An adsorption tower discharge system, characterized in that: The system includes a raffinate tower (5), a reforming pipeline (11), a raffinate pipeline (16), a raffinate tower top condenser line (12), an ineffective component discharge line (13), and a raffinate tower reflux line (14). The reforming pipeline (11) is sequentially connected to a reforming reactor (1), a xylene tower (2), a feed tank (3), and an adsorption separation tower (4). The inlet of the reforming pipeline (11) receives pre-hydrogenated naphtha, and the outlet of the reforming pipeline (11) is connected to the inlet of the adsorption separation tower (4). The first outlet of the adsorption separation tower (4) is connected to the inlet of the raffinate pipeline (16), and the outlet of the raffinate pipeline (16) is connected to the raffinate tower (5). 5) The second inlet; the top outlet of the evaporator (5) is connected to the inlet of the top condenser line (12) of the evaporator, the outlet of the top condenser line (12) of the evaporator is connected to the inlet of the reflux pump (7), and the evaporator reflux tank (6) is set on the top condenser line (12); the outlet of the reflux pump (7) is connected to the inlet of the reflux line (14) of the evaporator, and the outlet of the reflux line (14) of the evaporator is connected to the first inlet of the evaporator (5); the outlet of the reflux pump (7) is also connected to the inlet of the line for discharging invalid components (13), and the outlet of the line for discharging invalid components (13) is connected to the reforming line (11).

2. The adsorption tower discharge system according to claim 1, characterized in that: The second outlet of the adsorption separation tower (4) is connected to the inlet of the extraction pipeline (15), and the outlet of the extraction pipeline (15) outputs PX products. The extraction pipeline (15) is connected in sequence to the extraction liquid tower (9) and the PX product tower (10).

3. The adsorption tower discharge system according to claim 1, characterized in that: The second outlet of the raffinate tower (5) is connected to the inlet of the second pipeline (17) of the raffinate tower, and the outlet of the second pipeline (17) of the raffinate tower is connected to the second inlet of the xylene tower (2). An isomerization reaction device (8) is installed on the xylene tower (2).

4. The adsorption tower discharge system according to claim 1, characterized in that: An adsorption tower feed pump (18) is installed on the reforming pipeline (11), and the adsorption tower feed pump (18) is connected between the feed tank (3) and the adsorption separation tower (4).

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