Caprolactam production system
By installing heat exchangers and compressors in the caprolactam production system, efficient heat utilization is achieved, solving the problem of high steam and cooling water consumption and reducing production costs.
Patent Information
- Application Number
- CN202422977045.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-04
AI Technical Summary
The production of caprolactam involves a large amount of steam and cooling water, resulting in high overall costs.
By setting up heat exchangers and compressors, heat can be used efficiently. This includes heat exchange between the rearrangement reactor and the caprolactam aqueous solution feed pipe, and the steam at the top of the evaporator is compressed into high-grade steam for heating the distillation column.
It effectively saves on the use of steam and cooling water, reducing production costs.
Smart Images
Figure CN223570681U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to cyclohexanone oxime technical field, specifically is a caprolactam production system. BACKGROUND
[0002] The production process of caprolactam includes rearrangement reaction of cyclohexanone oxime and evaporation concentration of caprolactam aqueous solution; the rearrangement reaction of cyclohexanone oxime releases a large amount of heat, which needs to use a large amount of cooling water for cooling; the evaporation concentration of caprolactam aqueous solution needs to consume a large amount of steam for heating; so that the steam and cooling water usage is large in the production process of caprolactam, and the overall cost is high. SUMMARY
[0003] The main purpose of the utility model is to provide a caprolactam production system to solve the problem of large steam and cooling water usage in the production process of caprolactam in the prior art, and high overall cost.
[0004] In order to achieve the above purpose, the utility model provides a caprolactam production system, which comprises an evaporation tower and a rearrangement reactor, the evaporation tower is connected with a caprolactam aqueous solution feeding pipe, and the caprolactam aqueous solution feeding pipe is connected with a first heat exchange medium channel of a heat exchanger one; the rearrangement reactor is connected with a second heat exchange medium channel of the heat exchanger one through a circulating pipe one.
[0005] Further, a rectifying tower is connected with a toluene and cyclohexanone oxime mixture feeding pipe at the feeding port; the top of the rectifying tower is connected with a toluene discharge pipe, and the bottom is connected with the rearrangement reactor through a cyclohexanone oxime discharge pipe.
[0006] Further, the rectifying tower is connected with a first heat exchange medium channel of a heat exchanger two through a circulating pipe two.
[0007] Further, the top of the evaporation tower is connected with the inlet of a compressor through a steam discharge pipe, and the outlet of the compressor is connected with a second heat exchange medium channel of the heat exchanger two through a pipeline.
[0008] Further, a circulating pump is arranged on the circulating pipe one and the circulating pipe two.
[0009] The utility model discloses a heat exchanger one, which exchanges heat between the medium in the rearrangement reactor and the medium of the caprolactam aqueous solution feeding pipe, and uses the heat released by the rearrangement reaction of cyclohexanone oxime for the evaporation concentration of caprolactam aqueous solution; so as to save steam and cooling water, and reduce the cost.
[0010] The utility model discloses a compressor, which compresses the steam discharged from the top of the evaporation tower, pressurizes the steam into high-grade steam, and supplies the pressurized steam to the heat exchanger two to heat the medium in the rectifying tower; so as to save steam and reduce the cost. BRIEF DESCRIPTION OF DRAWINGS
[0011] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application and are incorporated by reference herein. The embodiments depicted are provided to explain the present application and are not intended to limit the present application in any way.
[0012] Figure 1 Structure schematic view of the embodiment;
[0013] In the figure: 1, evaporation tower; 2, rearrangement reactor; 3, caprolactam aqueous solution feed pipe; 4, circulation pipe one; 5, heat exchanger one; 6, rectification tower; 7, toluene and cyclohexanone oxime mixture feed pipe; 8, toluene discharge pipe; 9, cyclohexanone oxime discharge pipe; 10, circulation pipe two; 11, heat exchanger two; 12, circulation pump; 13, steam discharge pipe; 14, compressor. DETAILED DESCRIPTION
[0014] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0015] As Figure 1 shown, according to the embodiment of the present application, a caprolactam production system is provided, which comprises an evaporation tower 1 and a rearrangement reactor 2, the evaporation tower 1 is connected with a caprolactam aqueous solution feed pipe 3, the caprolactam aqueous solution feed pipe 3 is connected with a first heat exchange medium passage of a heat exchanger one 5; the rearrangement reactor 2 is connected with a second heat exchange medium passage of the heat exchanger one 5 through a circulation pipe one 4; the product obtained by reaction in the rearrangement reactor 2 is crude caprolactam.
[0016] It further comprises a rectification tower 6, the rectification tower 6 is connected with a toluene and cyclohexanone oxime mixture feed pipe 7 at the feed inlet; the top of the rectification tower 6 is connected with a toluene discharge pipe 8, and the bottom is connected with the rearrangement reactor 2 through a cyclohexanone oxime discharge pipe 9.
[0017] The rectification tower 6 is connected with a first heat exchange medium passage of a heat exchanger two 11 through a circulation pipe two 10.
[0018] The top of the evaporation tower 1 is connected with the inlet of a compressor 14 through a steam discharge pipe 13, the outlet of the compressor 14 is connected with a second heat exchange medium passage of the heat exchanger two 11 through a pipeline; the rectification of the rectification tower 6 needs to consume heat, and the steam discharged from the top of the evaporation tower 1 is compressed to supply heat for the rectification tower 6.
[0019] The circulation pipe one 4 and the circulation pipe two 10 are both provided with a circulation pump 12.
[0020] The embodiment sets the heat exchanger 5, exchanges heat between the medium in the rearrangement reactor 2 and the medium of the caprolactam aqueous solution feed pipe 3, and supplies the heat released by the rearrangement reaction of cyclohexanone oxime to the evaporation and concentration of the caprolactam aqueous solution, thereby saving steam and cooling water and reducing cost.
[0021] The embodiment sets the compressor 14, compresses the steam discharged from the top of the evaporation tower 1, pressurizes the steam into high-grade steam, and supplies the pressurized steam into the heat exchanger 2 11 to supply heat for the medium in the rectification tower 6, thereby saving steam and reducing cost.
[0022] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A caprolactam production system comprising an evaporation tower (1), a rearrangement reactor (2), a caprolactam aqueous solution feed pipe (3) connected to the evaporation tower (1), and a first heat exchange medium channel of a heat exchanger I (5) connected to the caprolactam aqueous solution feed pipe (3); characterized in that, The rearrangement reactor (2) is connected with the second heat exchange medium passage of the heat exchanger one (5) through the circulation pipe one (4).
2. The caprolactam production system according to claim 1, wherein The rectification tower (6) is connected with the toluene and cyclohexanone oxime mixture feeding pipe (7) at the feeding port; the top of the rectification tower (6) is connected with the toluene discharge pipe (8), and the bottom is connected with the rearrangement reactor (2) through the cyclohexanone oxime discharge pipe (9).
3. The caprolactam production system according to claim 2, wherein The rectification tower (6) is connected with the first heat exchange medium passage of the heat exchanger two (11) through the circulation pipe two (10).
4. The caprolactam production system according to claim 3, wherein The top of the evaporation tower (1) is connected with the inlet of the compressor (14) through the steam discharge pipe (13), and the outlet of the compressor (14) is connected with the second heat exchange medium passage of the heat exchanger two (11) through a pipeline.
5. The caprolactam production system as claimed in claim 4, characterized by, The circulation pump (12) is arranged on the circulation pipe one (4) and the circulation pipe two (10).