Tail gas treatment device for cyclohexane oxidation system and treatment method thereof

Abstract

The invention relates to a tail gas treatment device for a cyclohexane oxidation system. The device is characterized by comprising a temperature swing adsorption tower with three inlet pipelines, with the first inlet pipeline connected to a pipeline of tail gas to be treated through a control valve, the second inlet pipeline connected to the first joint of a heater through a control valve, and the third inlet pipeline connected to the first branch of an inert gas pipeline through a control valve. And the temperature swing adsorption tower has five outlet pipelines, wherein, the first outlet pipeline is in connection with a PSA (pressure swing adsorption) nitrogen making instrument through a control valve, the second outlet pipeline is in connection with an aerodynamic transfer line through a control valve, the third outlet pipeline is in connection with the second joint of the heater through a control valve, the fourth outlet pipeline is in connection with the first joint of a cooler through a control valve, and the fifth outlet pipeline is emptied at a high post through a control valve. The second joint of the cooler is in connected to the inlet of a gas-liquid separator, the gasoutlet of which is connected to the inert gas pipeline through a compressor. And the second branch of the inert gas pipeline is connected to the second joint of the heater through a control valve. The tail gas treatment device of the invention has the advantages of stable operation and good energy saving effect.

Description

technical field [0001] The invention relates to a device and a process for preparing cyclohexanol and cyclohexanone by oxidizing cyclohexane, in particular to a device and method for treating tail gas of a cyclohexane oxidation system. Background technique [0002] Cyclohexane is an important chemical raw material intermediate, which can be directly oxidized to generate cyclohexyl hydroperoxide, and then decomposed to generate cyclohexanol and cyclohexanone, both of which are also important chemical raw materials. The method of preparing cyclohexanol and cyclohexanone by oxidation of cyclohexane can be divided into non-catalytic oxidation method and catalytic oxidation method; according to the difference of oxidant, it can be divided into oxygen method and other oxidant method. The oxidant used is generally an oxygen-containing gas, such as air, pure oxygen, hydrogen peroxide, etc. [0003] Because the air oxidation method does not use a catalyst, the oxidation product cycl...

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Problems solved by technology

[0006] Above-mentioned application heat energy utilization rate is low, and energy-saving effect is poor; What is more serious simultaneously is that its operation safety is poor, and this is because the desorption gas used in the desorption process is the tail gas in the temperature swing adsorption process, due to the presence of cyclohexane, cyclohexane Organic substances such as alcohol and cyclohexanone, these organic substances will undergo polymerization during the high-temperature desorption process, and once the polymerization reaction occurs, the polymerization product will block the pipeline, and the device must be shut down; at the same time, due to the difficulty of removing the polymer, for the polymerization in the pipeline The reaction device is abolished

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