Hydrogen-containing tail gas recycling process of cyclohexanol production device

Abstract

The invention belongs to a hydrogen-containing tail gas recycling process of a cyclohexanol production device. The hydrogen-containing tail gas recycling process comprises the following steps: conveying hydrogen-containing tail gas generated by the cyclohexanol production device into a gas-liquid separator, and compressing the gas separated from the gas-liquid separator to be 0.8MPa by a compressor; then cooling the gas to 8 DEG C to 12 DEG C; finally, enabling the gas to enter a filtering separator to obtain waste liquid and crude hydrogen gas, and adsorbing the crude hydrogen gas by an adsorption tower to obtain product hydrogen gas; collecting waste liquid obtained by the filtering separator to a waste oil tank, and standing and separating out water; filtering an organic phase with a fine filter, and heating to 120 DEG C to 140 DEG C; then conveying the organic phase into a desulfurizing tower, and then cooling and conveying the organic phase to the cyclohexanol production device to be used as the raw material. With the adoption of the hydrogen-containing tail gas recycling process of the cyclohexanol production device, moisture and impurities in the tail gas exhausted by a hydrogenation reaction system of the cyclohexanol production device can be effectively separated, and components including benzene, cyclohexene, cyclohexane and the like in the tail gas are recycled very well; with the adoption of the process, the tail gas can be returned back to a dehydration tower of the cyclohexanol production device to be recycled.

Description

technical field [0001] The invention belongs to the technical field of cyclohexanol production by partial hydrogenation of benzene, and in particular relates to a recovery and utilization process of hydrogen-containing tail gas of a cyclohexanol production device. Background technique [0002] At present, in the production of cyclohexanol, the partial hydrogenation process of benzene is preferred to produce cyclohexanol, but the cyclohexanol production plant using this method consumes a lot of hydrogen, and the annual hydrogen consumption reaches tens of millions of standard cubic meters. The unit price of directly purchased hydrogen is about 2 yuan / standard cubic meter, the annual hydrogen consumption cost is nearly 100 million yuan, and the hydrogen production cost remains high. At the same time, the tail gas containing 95vol% hydrogen discharged from the hydrogenation reaction system of the cyclohexanol production unit is directly discharged to the torch for combustion, c...

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Problems solved by technology

[0002] At present, in the production of cyclohexanol, the partial hydrogenation process of benzene is preferred to produce cyclohexanol, but the cyclohexanol production plant using this method consumes a lot of hydrogen, and the annual hydrogen consumption reaches tens of millions of standard cubic meters. The unit price of directly purchased hyd

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