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CN-224207412-U - Cyclohexanol dehydrogenation reaction rectification integrated system

CN224207412UCN 224207412 UCN224207412 UCN 224207412UCN-224207412-U

Abstract

The utility model provides a cyclohexanol dehydrogenation reaction and rectification integrated system which comprises a cyclohexanol recovery tower and a heavy removal tower, wherein the top of the cyclohexanol recovery tower is connected with an alcohol dehydrogenation reactor B and a light removal tower second reboiler through a pipeline and an alcohol dehydrogenation reactor A respectively through pressurized gas phase materials, the light removal tower second reboiler is connected with the upper part of the cyclohexanol recovery tower through a cyclohexanol recovery tower reflux tank, the bottom of the cyclohexanol recovery tower is connected with the heavy removal tower through a pipeline, the top of the heavy removal tower is connected with the heavy removal tower reflux tank through a cyclohexanone product tower third reboiler, and the heavy removal tower reflux tank is connected with the upper part of the heavy removal tower through a pipeline. The utility model has compact structure and ingenious design, greatly improves the utilization rate of energy sources, ensures the stability and high efficiency of production, reduces the manufacturing cost and has good economic benefit.

Inventors

  • YIN YINHUA
  • ZHOU XUEJUN
  • YANG JUN
  • SHEN CHENGBIAO
  • CHEN HUA
  • ZHANG SHIHAO
  • FAN CHAO

Assignees

  • 湖北三宁化工股份有限公司

Dates

Publication Date
20260508
Application Date
20250430

Claims (10)

  1. 1. A cyclohexanol dehydrogenation reaction and rectification integrated system is characterized by comprising a cyclohexanol recovery tower (1) and a weight removal tower (2), wherein the top of the cyclohexanol recovery tower (1) is connected with an alcohol dehydrogenation reactor B (4) and a light removal tower second reboiler (11) through a pipeline and an alcohol dehydrogenation reactor A (3) respectively, the light removal tower second reboiler (11) is connected with the upper part of the cyclohexanol recovery tower (1) through a cyclohexanol recovery tower reflux tank (12), the bottom of the cyclohexanol recovery tower (1) is connected with the weight removal tower (2) through a pipeline, the top of the weight removal tower (2) is connected with a weight removal tower reflux tank (14) through a cyclohexanone product tower third reboiler (13), and the weight removal tower reflux tank (14) is connected with the upper part of the weight removal tower (2) through a pipeline.
  2. 2. The integrated system for the dehydrogenation and rectification of cyclohexanol according to claim 1, wherein the alcohol dehydrogenation reactor A (3) and the alcohol dehydrogenation reactor B (4) are connected with the alcohol dehydrogenation heat exchanger (5) through pipelines, and two sides of the alcohol dehydrogenation heat exchanger (5) are respectively connected with the cyclohexanol recovery tower (1) and the alcohol dehydrogenation feed preheater (7) through pipelines.
  3. 3. The integrated system for cyclohexanol dehydrogenation and rectification according to claim 2, wherein the cyclohexanol feed (17) is connected with the cyclohexanol recovery tower (1) through an alcohol dehydrogenation feed preheater (7).
  4. 4. A cyclohexanol dehydrogenation and rectification integrated system according to claim 3, wherein the ketone tower kettle (16) is connected with the cyclohexanol recovery tower (1) through a cyclohexanol recovery tower feed preheater (8).
  5. 5. The integrated system for the dehydrogenation and rectification of cyclohexanol according to claim 4, further comprising an alcohol dehydrogenation steam generator (6), wherein the alcohol dehydrogenation steam generator (6) and a cyclohexanol recovery tower feeding preheater (8) are connected with an alcohol dehydrogenation discharging separation tank (9) through pipelines respectively.
  6. 6. The integrated system for the dehydrogenation and rectification of cyclohexanol according to claim 5, wherein the pressure at the top of the cyclohexanol recovery tower (1) is not less than 60kPa.
  7. 7. The cyclohexanol dehydrogenation reaction and rectification integrated system according to claim 5 is characterized in that one side of an alcohol dehydrogenation discharging separation tank (9) is connected with a crude alcohol ketone preheater (10) through a pipeline, and the crude alcohol ketone preheater (10) is connected with a dehydration tower (18) through a pipeline.
  8. 8. The integrated system for the dehydrogenation and rectification of cyclohexanol according to claim 7 is characterized in that the other side of the alcohol dehydrogenation discharging separation tank (9) is connected with the crude alcohol ketone preheater (10) through an alcohol dehydrogenation product tank (19) and an electric pump unit (15).
  9. 9. The cyclohexanol dehydrogenation and rectification integrated system according to claim 1, wherein the heavy-duty removal tower reflux tank (14) is connected with the cyclohexanol recovery tower (1) through an electric pump unit (15).
  10. 10. The cyclohexanol dehydrogenation and rectification integrated system according to claim 1, wherein the bottom of the heavy oil removal tower (2) is connected with a heavy oil storage tank (20) through an electric pump unit (15).

Description

Cyclohexanol dehydrogenation reaction rectification integrated system Technical Field The utility model relates to the technical field of chemical production, in particular to a cyclohexanol dehydrogenation reaction and rectification integrated system. Background Cyclohexanone is one of important organic chemical raw materials for producing caprolactam, and in the process for producing cyclohexanone, both in the oxidative decomposition process and in the hydration process, byproducts or intermediate products for producing cyclohexanol are produced, and then the cyclohexanone is produced through the dehydrogenation reaction of cyclohexanol. In the current cyclohexanol dehydrogenation production process, two completely independent production systems of a cyclohexanol dehydrogenation reaction and a crude alcohol ketone refining system are generally adopted, the cyclohexanol is converted into cyclohexanone in a dehydrogenation reactor by about 45% reaction, light components, cyclohexanone, cyclohexanol and heavy components are separated from a dehydrogenation product crude alcohol ketone through rectification, the cyclohexanol separated through rectification is converged with fresh cyclohexanol in a front working section, the cyclohexanol is sent into the dehydrogenation reactor after being gasified by an evaporator, the cyclohexanol is required to be treated by a circulating water condenser and a chilled water cooler in the rectification system, and then is heated and gasified by steam, so that the consumption of vaporization heating steam is high in the process, and meanwhile, the power cost and the treatment cost of circulating water and chilled water are increased. Under the current and increasingly severe energy requirements and market competition, the purchasing cost of raw material benzene is subject to uncertainty of international crude oil market change, and as the purchasing cost of raw material coal is continuously increased, the steam heat energy cost is increased, and the cyclohexanone industry production faces increasingly severe situations. Disclosure of utility model The utility model provides a cyclohexanol dehydrogenation reaction and rectification integrated system, which solves the technical problems of high energy consumption and high manufacturing and production cost. In order to solve the technical problems, the method adopts the technical scheme that the method comprises a cyclohexanol recovery tower and a heavy removal tower, wherein the top of the cyclohexanol recovery tower is connected with an alcohol dehydrogenation reactor B and a light removal tower second reboiler through a pipeline and an alcohol dehydrogenation reactor A respectively through pressurized gas phase materials, the light removal tower second reboiler is connected with the upper part of the cyclohexanol recovery tower through a cyclohexanol recovery tower reflux tank, the bottom of the cyclohexanol recovery tower is connected with the heavy removal tower through a pipeline, the top of the heavy removal tower is connected with the heavy removal tower reflux tank through a cyclohexanone product tower third reboiler, and the heavy removal tower reflux tank is connected with the upper part of the heavy removal tower through a pipeline. In the preferred scheme, an alcohol dehydrogenation reactor A and an alcohol dehydrogenation reactor B are connected with an alcohol dehydrogenation heat exchanger through a pipeline, and two sides of the alcohol dehydrogenation heat exchanger are respectively connected with a cyclohexanol recovery tower and an alcohol dehydrogenation feed preheater through pipelines. In a preferred embodiment, the cyclohexanol feed is coupled to the cyclohexanol recovery column via an alcohol dehydrogenation feed preheater. In a preferred embodiment, the feed preheater from the ketone column bottom is connected to the cyclohexanol recovery column via a cyclohexanol recovery column. In the preferred scheme, an alcohol dehydrogenation steam generator is also arranged, and the alcohol dehydrogenation steam generator and a cyclohexanol recovery tower feeding preheater are respectively connected with an alcohol dehydrogenation discharging separation tank through pipelines. In a preferred embodiment, the overhead pressure of the cyclohexanol recovery column is not less than 60kPa. In the preferred scheme, one side of the alcohol dehydrogenation discharging separating tank is connected with a crude alcohol ketone preheater through a pipeline, and the crude alcohol ketone preheater is connected with a dehydration tower through a pipeline. In a preferred scheme, the other side of the alcohol dehydrogenation discharging separation tank is connected with the crude alcohol ketone preheater through an alcohol dehydrogenation product tank and an electric pump unit. In a preferred embodiment, the de-heavies column reflux drum is connected to the cyclohexanol recovery column via an electric pump unit. In the preferred s