Differentiated production system for refined hexamethylenediamine

Abstract

The utility model relates to a differential production system for refined hexamethylenediamine, which comprises a first intermittent tower, a second intermittent tower, a third intermittent tower, a first crude hexamethylenediamine tank, a second crude hexamethylenediamine tank, a distillate transfer tank, a third crude hexamethylenediamine tank, a distillate transfer pump and a pipeline system, and the distillate transfer tank and the pipeline system are used for respectively conveying the tower top distillate of the third intermittent tower to the first crude hexamethylenediamine tank and the second crude hexamethylenediamine tank for rectification treatment, so that the content of impurities in the product in the third crude hexamethylenediamine tank is reduced, and differential production of refined hexamethylenediamine is realized. The device is ingenious in design, the content of impurities in products in the third crude hexamethylenediamine tank is reduced by additionally arranging the storage tank and the pipeline, differential production of refined hexamethylenediamine is achieved, and the problems that an existing hexamethylenediamine device is old, long in operation cycle and limited in product quality improvement are solved. The method not only has very important significance in the aspects of energy conservation and consumption reduction, but also has very good economic benefits and development space.

Description

Technical Field

[0001] The utility model relates to the technical field of hexamethylenediamine production, in particular to a differentiated production system of refined hexamethylenediamine. Background Art

[0002] Hexamethylenediamine is an important organic compound, primarily used in organic synthesis, epoxy curing agents, and chemical reagents. It is one of the main raw materials for the production of PA66. The high performance of PA66 depends primarily on the purity of the raw material, hexamethylenediamine. Currently, hexamethylenediamine products available on the market come in various specifications, such as 85% and 99.8%. These products contain high impurity levels, making it difficult to meet the needs of high-end customers. However, existing hexamethylenediamine plants have limited product quality improvements due to outdated equipment and long operating cycles. Building on existing hexamethylenediamine plants, technologically transforming and optimizing key process flows to improve the various quality indicators of refined hexamethylenediamine products, meet the needs of high-end customers, and achieve differentiated production of refined hexamethylenediamine will have a crucial positive impact on enhancing the competitiveness of nylon chemical hexamethylenediamine products and improving the quality of downstream products such as PA66 salt, chips, and civilian silk. Utility Model Content

[0003] In order to solve the problems of the existing hexamethylenediamine device due to outdated equipment, long operating cycle and limited product quality improvement, the utility model provides a differentiated production system for refined hexamethylenediamine. By adding storage tanks and pipelines, the top distillate of the third intermittent tower is sent to the first crude hexamethylenediamine tank and the second crude hexamethylenediamine tank for distillation treatment, thereby reducing the content of impurities in the product of the third crude hexamethylenediamine tank and realizing differentiated production of refined hexamethylenediamine.

[0004] The technical solution adopted by the utility model to solve the above technical problems is: a differentiated production system of refined hexamethylenediamine, comprising a first intermittent tower, a second intermittent tower, a third intermittent tower, a first crude hexamethylenediamine tank, a second crude hexamethylenediamine tank, a distillate transfer tank, a third crude hexamethylenediamine tank, a distillate transfer pump and a pipeline system;

[0005] The pipeline system includes a first intermittent tower distillate pipeline, a second intermittent tower distillate pipeline, a third intermittent tower distillate pipeline, a newly added transfer tank distillate pipeline, a transfer pump inlet pipeline, and a transfer pump feed pipeline;

[0006] The overhead distillate of the third intermittent tower is transported to the distillate transfer tank through the newly added transfer tank distillation pipeline and stored;

[0007] The overhead distillate stored in the distillate transfer tank is respectively sent to the first crude hexamethylenediamine tank and the second crude hexamethylenediamine tank through a distillate transfer pump for further distillation, and a higher-purity crude hexamethylenediamine product is left in the third crude hexamethylenediamine tank, thereby realizing differentiated production of refined hexamethylenediamine.

[0008] As a further optimization solution for the above-mentioned differentiated production system of purified hexamethylenediamine, a flow meter is provided on the transfer pump feeding pipeline.

[0009] As a further optimization solution for the above-mentioned differentiated production system of purified hexamethylenediamine, a shut-off valve is provided on the distillation pipeline of the third intermittent tower, and the shut-off valve can switch the production mode at any time to realize differentiated production of purified hexamethylenediamine.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention includes a first intermittent tower, a second intermittent tower, a third intermittent tower, a first crude hexamethylenediamine tank, a second crude hexamethylenediamine tank, a distillate transfer tank, a third crude hexamethylenediamine tank, a distillate transfer pump and a pipeline system. The distillate transfer tank and the pipeline system respectively send the distillate from the top of the third intermittent tower to the first crude hexamethylenediamine tank and the second crude hexamethylenediamine tank for distillation treatment, thereby reducing the content of impurities in the product of the third crude hexamethylenediamine tank, realizing differentiated production of refined hexamethylenediamine, improving the quality of refined hexamethylenediamine products in nylon chemical industry, and having very important positive significance for improving the quality of downstream PA66 salt, chips and civilian silk products. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the process structure of the utility model;

[0012] Markings in the figure: 1. First intermittent tower, 2. Second intermittent tower, 3. Third intermittent tower, 4. First crude hexamethylenediamine tank, 5. Second crude hexamethylenediamine tank, 6. Distillate transfer tank, 7. Third crude hexamethylenediamine tank, 8. Distillate transfer pump, 9. First intermittent tower distillate pipeline, 10. Second intermittent tower distillate pipeline, 11. Third intermittent tower distillate pipeline, 12. Newly added transfer tank distillate pipeline, 13. Transfer pump inlet pipeline, 14. Transfer pump feed pipeline, 15. Shut-off valve, 16. Flow meter. DETAILED DESCRIPTION

[0013] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0014] A differentiated production system for refined hexamethylenediamine comprises a first intermittent tower 1, a second intermittent tower 2, a third intermittent tower 3, a first crude hexamethylenediamine tank 4, a second crude hexamethylenediamine tank 5, a distillate transfer tank 6, a third crude hexamethylenediamine tank 7, a distillate transfer pump 8, and a pipeline system. The distillate transfer tank 6 and the pipeline system respectively transport the overhead distillate of the third intermittent tower 3 to the first crude hexamethylenediamine tank 4 and the second crude hexamethylenediamine tank 5 for distillation, thereby reducing the content of impurities in the product of the third crude hexamethylenediamine tank 7 and achieving differentiated production of refined hexamethylenediamine.

[0015] The pipeline system includes a first intermittent tower distillate pipeline 9, a second intermittent tower distillate pipeline 10, a third intermittent tower distillate pipeline 11, a newly added transfer tank distillate pipeline 12, a transfer pump inlet pipeline 13, and a transfer pump feed pipeline 14;

[0016] The overhead distillate of the third intermittent tower 3 is transported to the distillate transfer tank 6 through the newly added transfer tank distillation pipeline 12 and stored;

[0017] The overhead distillate stored in the distillate transfer tank 6 is respectively sent to the first crude hexamethylenediamine tank 4 and the second crude hexamethylenediamine tank 5 through the distillate transfer pump 8 for further distillation, and a higher purity crude hexamethylenediamine product is left in the third crude hexamethylenediamine tank 7, thereby realizing differentiated production of refined hexamethylenediamine.

[0018] A flow meter 16 is provided on the transfer pump feeding pipeline 14 .

[0019] The third intermittent tower distillation pipeline 11 is provided with a shut-off valve 15, which can switch the production mode at any time to achieve differentiated production of purified hexamethylenediamine.

[0020] The working process of the differentiated production of refined hexamethylenediamine of the present invention is as follows: as shown in the accompanying drawings, first, the valve on the distillation line 11 of the third intermittent tower is closed, and the shut-off valve 15 is closed. The distillate from the top of the third intermittent tower 3 is distilled into the distillate transfer tank 6 through the newly added transfer tank distillation line 12, and no longer returns to the third crude hexamethylenediamine tank 7.

[0021] Next, distillate transfer tank 6 stores the overhead distillate from the third intermittent tower 3. When the liquid level in distillate transfer tank 6 reaches the set value, the valves before and after distillate transfer pump 8 and the valves on transfer pump feed line 14 leading to the first crude hexamethylenediamine tank 4 and the second crude hexamethylenediamine tank 5 are opened. Distillate transfer pump 8 adjusts the pump outlet valve opening to ensure that flow meter 16 (model FI582) reaches the target value. Distillate transfer pump 8 then delivers the distillate from distillate transfer tank 6 to the first crude hexamethylenediamine tank 4 and the second crude hexamethylenediamine tank 5, respectively, for processing. This reduces the impurity content in the hexamethylenediamine product in the third crude hexamethylenediamine tank 7, resulting in higher-purity crude hexamethylenediamine and achieving differentiated production of crude hexamethylenediamine.

[0022] When the material in the distillate transfer tank 6 is emptied or the first crude hexamethylenediamine tank 4 and the second crude hexamethylenediamine tank 5 cannot continue to be processed, the distillate transfer pump 8 is stopped, and the relevant valves are closed in sequence, and the valve on the third intermittent tower distillate pipeline 11 and the shut-off valve 15 are opened to restore the normal production operation of the device.

[0023] The utility model is cleverly designed. By adding storage tanks and pipelines, the distillate from the top of the third intermittent tower is respectively sent to the first crude hexamethylenediamine tank and the second crude hexamethylenediamine tank for distillation treatment, thereby reducing the content of impurities in the product of the third crude hexamethylenediamine tank, realizing differentiated production of refined hexamethylenediamine, and solving the problems of the existing hexamethylenediamine device due to old equipment, long operating cycle and limited product quality improvement. The quality of refined hexamethylenediamine products in nylon chemical industry is improved, and it has very important positive significance for improving the quality of downstream PA66 salt, chips and civilian silk and other products.

[0024] The preferred specific implementation methods and embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation methods and embodiments. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the concept of the present invention.

Claims

1. A differentiated production system for refined hexamethylenediamine, characterized by: The invention comprises a first intermittent tower (1), a second intermittent tower (2), a third intermittent tower (3), a first crude hexamethylenediamine tank (4), a second crude hexamethylenediamine tank (5), a distillate transfer tank (6), a third crude hexamethylenediamine tank (7), a distillate transfer pump (8) and a pipeline system; The pipeline system includes a first intermittent tower distillate pipeline (9), a second intermittent tower distillate pipeline (10), a third intermittent tower distillate pipeline (11), a newly added transfer tank distillate pipeline (12), a transfer pump inlet pipeline (13), and a transfer pump feed pipeline (14); The distillate from the top of the third intermittent tower (3) is transported to the distillate transfer tank (6) through the newly added transfer tank distillation pipeline (12) and stored; The overhead distillate stored in the distillate transfer tank (6) is respectively sent to the first crude hexamethylenediamine tank (4) and the second crude hexamethylenediamine tank (5) through the distillate transfer pump (8) for further distillation, and a crude hexamethylenediamine product with a higher purity is left in the third crude hexamethylenediamine tank (7), thereby realizing differentiated production of refined hexamethylenediamine.

2. The differentiated production system of hexamethylenediamine according to claim 1, characterized in that: A flow meter (16) is provided on the transfer pump feeding pipeline (14).

3. The differentiated production system of hexamethylenediamine according to claim 1, wherein: The third intermittent tower distillation pipeline (11) is provided with a shut-off valve (15), and the shut-off valve (15) switches the production mode at any time to achieve differentiated production of refined hexamethylenediamine.

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