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Green energy-saving system and method for preparing cyclohexanone through oxidation of cyclohexane

A technology of cyclohexane and cyclohexanone, which is applied in the system field of preparing cyclohexanone by oxidation of cyclohexane, can solve the problems of high operating cost, large compression capacity, great potential for energy saving and consumption reduction, etc., and achieve saving of production cost, reduction of Small energy consumption, simple process effect

Pending Publication Date: 2018-09-07
TIANJIN TIANDI CHUANGZHI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the current tail gas treatment process has high investment and operating costs.
And the oxygen-containing oxidant gas used needs to be compressed to a working pressure of 1.1-1.2MPa, the compression volume is large, the operating cost is high, and the potential for energy saving and consumption reduction is huge

Method used

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  • Green energy-saving system and method for preparing cyclohexanone through oxidation of cyclohexane
  • Green energy-saving system and method for preparing cyclohexanone through oxidation of cyclohexane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A green and energy-saving method for preparing cyclohexanone by oxidation of cyclohexane, comprising the steps of:

[0036] (1) Use the first green and energy-saving cyclohexane oxidation system to prepare cyclohexanone; see figure 1

[0037] (2) Hexanaphthene is passed into the micro-reaction system from the cyclohexane feed tank area A, and the oxygen in the oxygen tank area B is passed into the micro-reaction system at the same time, and the gaseous phase after the reaction is compressed by a centrifugal compressor and then mixed with the gas phase from the oxygen tank area The oxygen in B re-enters the micro-reaction system after being mixed, and the liquid phase after the reaction enters the post-separation section C.

[0038] In this embodiment, cyclohexane containing catalyst boric acid can be substituted for cyclohexane.

[0039] The catalyst can be any suitable cyclohexane catalyst known in the art, including photocatalytic oxidation catalysts of cobalt or so...

Embodiment 2

[0041] A green and energy-saving method for preparing cyclohexanone by oxidation of cyclohexane, comprising the steps of:

[0042] (1) Use the first green and energy-saving cyclohexane oxidation system to prepare cyclohexanone;

[0043] (2) The cyclohexane containing catalyst cobalt stearate is passed into the multistage cyclohexane oxidation reaction system from the cyclohexane feed tank area A, and the oxygen in the oxygen tank area B is passed into the multistage cyclohexane simultaneously Oxidation reaction system, the gaseous phase after the reaction is compressed by the gas-phase screw compressor, mixed with oxygen from the oxygen tank area B, and then re-enters the multi-stage cyclohexane oxidation reaction system, and the liquid phase after the reaction enters the post-separation section C.

[0044] Examples 1 and 2 produced no tail gas.

[0045] Replace the multi-stage cyclohexane oxidation reaction system of this embodiment with a photocatalytic oxidation reactor, a...

Embodiment 3

[0047] The second green and energy-saving method for preparing cyclohexanone by oxidation of cyclohexane comprises the following steps:

[0048] (1) use the second kind of green and energy-saving cyclohexane oxidation to prepare the system of cyclohexanone; see figure 2

[0049] (2) The cyclohexane containing catalyst boric acid is passed into the multistage cyclohexane oxidation reaction system 11 from the cyclohexane feed tank area A1, and the mixed gas of the air and oxygen in the tank area B1 (oxygen volume content 93 %) into the multistage cyclohexane oxidation reaction system, the gas phase after the reaction is compressed by the reciprocating compressor 12 and then divided into two paths, one path is mixed with the above-mentioned mixed gas from the tank area B1 and then re-enters the multistage cyclohexane oxidation reaction system, the other way leads to the post-tail gas treatment device D1, and the liquid phase after the reaction enters the post-separation section...

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Abstract

The invention discloses a green energy-saving system and method for preparing cyclohexanone through oxidation of cyclohexane. The green energy-saving system for preparing cyclohexanone through oxidation of cyclohexane comprises a reaction device (1) and a high-pressure gas circulation device (2), wherein a cyclohexane feeding tank zone (A) is connected to the reaction device through a pipeline; the reaction device is connected to the high-pressure gas circulation device through a pipeline; the discharge pipeline of the high-pressure gas circulation device and the feeding pipeline of an oxygentank zone (B) converge and are then connected with the reaction device; and the reaction device is connected with a post-separation section (C) through a pipeline. The system of the invention directlycarries out cyclic compression on reacted high-pressure tail gas without pressure relief, and the tail gas is mixed with oxygen and air in any ratio and then enters a reaction system again, so the residual pressure of the tail gas is fully utilized, and the compressor only consumes a small amount of energy needed in the circulation of the tail gas; and thus, the energy consumption of the compressor is greatly reduced, and the system has the outstanding advantages of simple process, no tail gas emission, low energy consumption and the like.

Description

technical field [0001] The invention relates to a system and a method for preparing cyclohexanone by oxidation of cyclohexane. Background technique [0002] Cyclohexanone is the main intermediate for the preparation of caprolactam and adipic acid, the main raw material for the preparation of various vinyl paints, and is widely used as a solvent for many polymers. Therefore, cyclohexanone plays an extremely important role in organic chemical industry and coating industry. Cyclohexane liquid-phase oxidation is the most common method for preparing cyclohexanone, accounting for more than 90% of the production process of cyclohexanone. In this method, oxygen-containing gas is used as an oxidizing agent, and the oxidation reaction is carried out at a relatively high temperature (80-165° C.) and pressure (about 1.2 MPa). Since the oxygen-containing gas contains inert components, the tail gas after oxidation is saturated with the reaction materials. It is necessary to recover the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/33C07C49/403
CPCC07C45/33C07C49/403Y02P20/10
Inventor 张敏卿张金利李文鹏
Owner TIANJIN TIANDI CHUANGZHI TECH DEV