Oxidized tail gas energy recovery method during cyclohexanone oxidation production

Abstract

The invention relates to the field of oxidized tail gas energy recovery method during cyclohexanone oxidation production and provides an oxidized tail gas energy recovery method during cyclohexanone oxidation production in order to solve the problems that an existing cyclohexanone device is high in energy consumption and unreasonable in energy utilization. The method comprises the steps of conducting catalytic combustion on organic matter such as cyclohexane, cyclohexanone and cyclohexanol with the total content of 10-3000 ppm to form carbon dioxide and water; feeding treated exhaust gas intoan expansion machine; converting heat energy generated during the catalytic treatment process and the pressure of an expansion power generator unit into electric energy through one-time expansion, anddirectly emptying the exhaust gas subjected to energy recovery from an outlet of the expansion machine. According to the oxidized tail gas energy recovery method during cyclohexanone oxidation production, the device is simple in structure, stable in operation, reasonable in energy utilization and high in economic benefit, extra equipment investment is avoided, consumption of low-pressure steam isreduced, and the problems existing in the prior art are solved well.

Description

technical field [0001] The invention relates to the technical field of producing cyclohexanone by a cyclohexane oxidation method, in particular to a method for recovering energy from oxidation tail gas in the production of cyclohexanone by an oxidation method. Background technique [0002] Cyclohexanone is an important organic synthesis raw material and solvent, and is the main intermediate in the manufacture of nylon, caprolactam and adipic acid. At present, the demand for cyclohexanone is increasing day by day, and its development and utilization have broad prospects. In the production process of cyclohexanone by oxidation method, the pressure of the oxidation tail gas discharged from the top of the alcohol and ketone absorption tower is relatively high (>1.0MPaG), and the oxidation tail gas contains a small amount of organic substances such as cyclohexane, cyclohexanone, and cyclohexanol. If the exhaust gas is directly vented without subsequent treatment, it will not ...

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Problems solved by technology

However, this method has the disadvantages of unreasonable utilization of energy, which requires extra heat to heat the tail gas of cyclohexanone at the inlet of the expander, and additional fuel for the catalytic oxidation reaction, and the tail gas has many organic substances, is easy to condense, corrodes, and the operation of the expander is unstable.

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