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Device and technique for producing cyclohexane by benzene hydrogenation

A technology of benzene hydrogenation and cyclohexane, applied in the field of chemistry, can solve the problems of high maintenance cost, large bubble diameter, long reaction time, etc., and achieve the effects of high mass transfer efficiency, high reaction rate and short reaction time

Active Publication Date: 2016-12-07
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the existing process of hydrogenation of benzene to produce cyclohexane achieves the recovery and utilization of hydrogen, it undergoes a heat exchange and compression during the recovery process of hydrogen, which greatly increases energy consumption. At the same time, the cost of the compressor is relatively expensive and Follow-up maintenance costs are high
More importantly, due to the large diameter of the bubbles formed after the hydrogen in the existing reactor enters the liquid phase (generally between 5-20 mm), the gas-liquid contact interface is limited and the mass transfer efficiency is not high, thus restricting This improves the efficiency of the hydrogenation reaction, resulting in a longer reaction time and higher energy and material consumption indicators in the process

Method used

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  • Device and technique for producing cyclohexane by benzene hydrogenation
  • Device and technique for producing cyclohexane by benzene hydrogenation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The volume is 1M 3 50kg / h normal temperature benzene and catalyst are added to the reactor R-1, and fresh hydrogen with a temperature of 100°C and a pressure of 0.3MPa is added to the reactor R-1 through the buffer tank C-1; Motor S-1 and heat exchanger H-1 are mixed and heated to a temperature of 210°C and a pressure of 1.5MPa. When the pressure of the reactor R-1 reaches the set value of 1.5MPa, slowly open the gas phase outlet valve at the top of the reactor R-1 to control the tail gas flow at the set value of 2m 3 / h, to maintain the pressure required for the reaction, the tail gas enters the gas phase inlet of the bubble breaker S-2 through the pipeline 5. After the reaction, the 25kg / h mainly containing the product cyclohexane, a small amount of intermediate products and unreacted benzene is transported to the liquid phase inlet of the bubble breaker S-2 through the pipeline 6 through the pump P-1.

[0067] The superfine bubble generator R-2 communicates with th...

Embodiment 2

[0069] The volume is 2.5M 3 Add 100kg / h normal temperature benzene and catalyst into the reactor R-1, add fresh hydrogen with a temperature of 120°C and a pressure of 0.5MPa into the reactor R-1 through the buffer tank C-1; open the reactor R-1 Motor S-1 and heat exchanger H-1 are mixed and heated to a temperature of 250°C and a pressure of 2.0MPa. When the pressure of the reactor R-1 reaches the set value of 2.0MPa, slowly open the gas phase outlet valve at the top of the reactor R-1 to control the tail gas flow at the set value of 4m 3 / h, to maintain the pressure required for the reaction, the tail gas enters the gas phase inlet of the bubble breaker S-2 through the pipeline 5. After the reaction, the 25kg / h mainly containing the product cyclohexane, a small amount of intermediate products and unreacted benzene is transported to the liquid phase inlet of the bubble breaker S-2 through the pipeline 6 through the pump P-1.

[0070] The superfine bubble generator R-2 communi...

Embodiment 3

[0072] Reactor R-1 has a tower diameter of 800mm and a tower height of 4.5m. There are five layers of sieve plates with an opening rate of 60%. The jet circulator S-3 is fixed in the center of the first layer of sieve plates. The distance between the plates is 0.4m, and there is a circulation outlet above the first sieve plate. Add 100kg / h normal temperature benzene and catalyst to reactor R-1, and add fresh hydrogen with a temperature of 100°C and a pressure of 0.3MPa into reactor R-1 through buffer tank C-1; the operation in reactor R-1 The temperature is set to 140°C and the pressure is set to 1.2MPa. When the liquid level in the reactor R-1 exceeds the circulation outlet, the pump P-1 is turned on to transport the reaction feed liquid to the jet circulator S-3 and a circulating liquid phase inlet, wherein the circulating liquid phase inlet is arranged in the tangential direction of the tower wall, and the circulating liquid phase enters the reactor R-1 in the tangential di...

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Abstract

The invention discloses a device and technique for producing cyclohexane by benzene hydrogenation. The device for producing cyclohexane by benzene hydrogenation comprises a reactor, a superfine bubble generator and a bubble breaker, wherein the reactor is provided with a first containing cavity; the wall of the first containing cavity is provided with a feed port, a circulation discharge port, a circulation return port and a gas phase outlet; the superfine bubble generator is provided with a second containing cavity; the wall of the second containing cavity is provided with a return port and a gas phase outlet; the return port of the superfine bubble generator communicates with the circulation return port of the reactor; the bubble breaker is arranged in the second containing cavity; the bubble breaker is provided with a gas phase inlet and a liquid phase inlet which communicates with the circulation discharge port of the reactor; and the gas phase inlet of the bubble breaker communicates with the gas phase outlet of the reactor. The device disclosed by the embodiment of the invention has the advantages of high mass transfer efficiency, high reaction rate, short reaction time, low material consumption and energy consumption, simple structure, low manufacturing cost and low maintenance cost.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a device for producing cyclohexane by hydrogenating benzene, and also to a process for producing cyclohexane by hydrogenating benzene. Background technique [0002] Cyclohexane is an important organic chemical raw material. Cyclohexane is colorless, easy to flow, and has a pungent smell. It is the main raw material for the production of nylon products. At the same time, cyclohexane is an excellent solvent for cellulose ether, resin, wax, asphalt and rubber. 90% of cyclohexane is produced by hydrogenation of benzene. [0003] In the existing process of hydrogenation of benzene to produce cyclohexane, unreacted high-temperature and high-pressure hydrogen, cyclohexane steam, benzene and some intermediate products enter the cold trap through the gas phase outlet at the top of the reactor, and the organic compounds are condensed into liquid The liquid phase exits through the bottom of the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/10C07C13/18
CPCC07C5/10C07C13/18
Inventor 周政王宝荣田洪舟杨国强张锋张志炳
Owner NANJING UNIV
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