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CN-224207719-U - Cyclohexanone hydrogenation flash distillation gas recycle device

CN224207719UCN 224207719 UCN224207719 UCN 224207719UCN-224207719-U

Abstract

The device comprises a main pipe for conveying raw material gas and a plurality of hydrocarbon removing units, wherein the main pipe is connected with the hydrocarbon removing units, the hydrocarbon removing units are connected to an exhaust pipe, each hydrocarbon removing unit comprises a hydrocarbon removing tower, the top of each hydrocarbon removing tower is connected with the main pipe through an upper connecting pipe, the bottom of each hydrocarbon removing tower is connected with the exhaust pipe through a lower connecting pipe, an upper valve is arranged on the upper connecting pipe, and a lower valve is arranged on the lower connecting pipe. The utility model aims to solve the technical problem of providing a cyclohexanone hydrogenation flash gas recycling device for recycling hydrogen in hydrogenation flash gas. The device realizes the efficient recovery, continuous treatment and impurity deep removal of hydrogen in flash steam through technical innovation, has economic benefit, environmental protection benefit and operation flexibility, and provides key technical support for cost reduction and synergy in the cyclohexanone production process.

Inventors

  • WEI TIANRONG
  • XU SIHONG
  • ZHOU XUEJUN
  • SHEN CHENGBIAO
  • CHEN YING
  • YE LANTAO
  • WU LINTAO

Assignees

  • 湖北三宁化工股份有限公司

Dates

Publication Date
20260508
Application Date
20250429

Claims (7)

  1. 1. The device for recycling flash gas in cyclohexanone hydrogenation reaction is characterized by comprising a main pipe (3) for conveying raw material gas and a plurality of hydrocarbon removing units, wherein the main pipe (3) is connected with the hydrocarbon removing units, and the hydrocarbon removing units are connected to an exhaust pipe (4); The hydrocarbon removal unit comprises a hydrocarbon removal tower (5), wherein the top of the hydrocarbon removal tower (5) is connected with the main pipe (3) through an upper connecting pipe (6), the bottom of the hydrocarbon removal tower is connected with the exhaust pipe (4) through a lower connecting pipe (7), an upper valve (8) is arranged on the upper connecting pipe (6), and a lower valve (9) is arranged on the lower connecting pipe (7); The device further comprises a first circulating pipe (10), a second circulating pipe (11), a third circulating pipe (12) and a fourth circulating pipe (13), wherein the first circulating pipe (10) is connected with the main pipe (3), a first connecting pipe (14) and a first valve (15) are arranged between the upper connecting pipe (6) and the first circulating pipe (10), the second circulating pipe (11) is connected with the main pipe (3), a second connecting pipe (16) and a second valve (17) are arranged between the upper connecting pipe (6) and the second circulating pipe (11), the third circulating pipe (12) is connected to the fourth circulating pipe (13) after being connected with a regenerated gas heater (18), a third connecting pipe (19) and a third valve (20) are arranged between the third circulating pipe (12) and the lower connecting pipe (7), and a fourth connecting pipe (21) and a fourth valve (22) are arranged between the fourth circulating pipe (13) and the lower connecting pipe (7).
  2. 2. The recycling device for flash gas in cyclohexanone hydrogenation reaction according to claim 1, further comprising a raw gas pipe (1) for conveying hydrogenation flash gas, wherein the raw gas pipe (1) is connected to a raw gas separator (2), the raw gas separator (2) performs gas-liquid separation on the raw gas, waste liquid is discharged from the bottom, and gas is conveyed to a main pipe (3) from the top.
  3. 3. The recycling device for the flash gas of the cyclohexanone hydrogenation reaction according to claim 1, wherein the second circulating pipe (11) is sequentially connected with a regenerated gas cooler (23), a regenerated gas subcooler (24) and a regenerated gas separator (25), the regenerated gas separator (25) performs gas-liquid separation on the regenerated gas, waste liquid is discharged from the bottom, and gas is conveyed to the main pipe (3) from the top.
  4. 4. The recycling device for flash gas in cyclohexanone hydrogenation reaction of claim 1, wherein at least three hydrocarbon removing units are arranged.
  5. 5. The recycling device for flash gas in cyclohexanone hydrogenation reaction of claim 1, wherein steam is introduced into the regeneration gas heater (18) to heat the regeneration gas.
  6. 6. The recycling device for cyclohexanone hydrogenation reaction flash gas, as set forth in claim 3, characterized in that cooling water at 20-30 ℃ is introduced into the regenerated gas cooler (23).
  7. 7. The recycling device for flash gas in cyclohexanone hydrogenation reaction according to claim 3, wherein cooling water at 0-10 ℃ is introduced into the regenerated gas subcooler (24).

Description

Cyclohexanone hydrogenation flash distillation gas recycle device Technical Field The utility model relates to the technical field of flash gas recycling, in particular to a device for recycling flash gas in cyclohexanone hydrogenation reaction. Background Cyclohexanone is one of important organic chemical raw materials for producing caprolactam, and benzene is used as a main production raw material in a process for producing cyclohexanone, namely an oxidative decomposition process and a hydration process. The hydration process is to prepare cyclohexene by partial hydrogenation reaction of benzene as raw material under the conditions of 100-180 ℃ and 3-10 MPa and ruthenium catalyst. Cyclohexene is hydrated to form cyclohexanol under the action of high-silicon zeolite ZSM-5 catalyst. The hydrogenation reaction system of the cyclohexanone device by the hydration method is a slurry bed, the circulation amount is large, the system pressure is high (4.5-5.5 MPa), the pressure needs to be reduced to a normal pressure state when the cyclohexanone device is separated in a later working section, a large amount of hydrogen dissolved in circulating liquid can flash out, and the traditional technology is to put the part of gas into a torch system to be discharged or sent to a gas system to be burnt, so that a large amount of effective components are wasted. 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, so that the cyclohexanone industry production faces increasingly severe situations. In order to further improve the utilization rate of raw materials in the cyclohexanone production process and reduce the production cost of the cyclohexanone, a key technology for recycling flash gas in the cyclohexanone hydrogenation reaction is needed to be researched and developed. Disclosure of Invention The utility model aims to solve the technical problem of providing a cyclohexanone hydrogenation flash gas recycling device for recycling hydrogen in hydrogenation flash gas. In order to solve the technical problems, the technical scheme adopted by the utility model is that the recycling device of the flash evaporation gas of the cyclohexanone hydrogenation reaction comprises a main pipe for conveying raw material gas and a plurality of hydrocarbon removing units, wherein the main pipe is connected with the hydrocarbon removing units, and the hydrocarbon removing units are connected to an exhaust pipe; The hydrocarbon removal unit comprises a hydrocarbon removal tower, the top of the hydrocarbon removal tower is connected with the main pipe through an upper connecting pipe, the bottom of the hydrocarbon removal tower is connected with the exhaust pipe through a lower connecting pipe, an upper valve is arranged on the upper connecting pipe, and a lower valve is arranged on the lower connecting pipe; The device further comprises a first circulating pipe, a second circulating pipe, a third circulating pipe and a fourth circulating pipe, wherein the first circulating pipe is connected with the main pipe, a first connecting pipe and a first valve are arranged between the upper connecting pipe and the first circulating pipe, the second circulating pipe is connected with the main pipe, a second connecting pipe and a second valve are arranged between the upper connecting pipe and the second circulating pipe, the third circulating pipe is connected to the fourth circulating pipe after being connected with the regenerated gas heater, a third connecting pipe and a third valve are arranged between the third circulating pipe and the lower connecting pipe, and a fourth connecting pipe and a fourth valve are arranged between the fourth circulating pipe and the lower connecting pipe. Preferably, the hydrogenation flash gas separator also comprises a raw material gas pipe for conveying hydrogenation flash gas, wherein the raw material gas pipe is connected to the raw material gas separator, the raw material gas separator performs gas-liquid separation on the raw material gas, waste liquid is discharged from the bottom, and gas is conveyed to the main pipe from the top. Preferably, the second circulating pipe is sequentially connected with the regenerated gas cooler, the regenerated gas subcooler and the regenerated gas separator, the regenerated gas separator performs gas-liquid separation on the regenerated gas, waste liquid is discharged from the bottom, and gas is conveyed to the main pipe from the top. Preferably, at least three hydrocarbon removing units are provided. Preferably, steam is introduced into the regeneration gas heater to heat the regeneration gas. Preferably, cooling water at 20-30 ℃ is introduced into the regeneration gas cooler. Preferably, cooling water at 0-10 ℃ is introduced into the regenerated gas subcooler. The utility model provides a device for recycling flash gas in cycloh