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 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 hydrogenation reaction system of the cyclohexanol production unit discharges the tail gas containing 95vol% hydrogen directly to the torch for combustion, causing great waste

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