Device and method for purifying and recovering tail gas of benzene-hydrogenation truck

Abstract

The invention discloses a device and a method for purifying and recovering the tail gas of a benzene-hydrogenation truck. The device comprises a tail-gas fan, N absorbing tanks, a purified-gas discharging pipeline, a desorbed-steam input pipeline, a benzene-containing steam discharging pipeline, a condensation cooler, an oil-water separating groove and a benzene storage groove, wherein the tail-gas fan is used for introducing benzene-containing tail gas escaping from a truck opening in the benzene-hydrogenation process into the N absorbing tanks; all benzene-containing tail gas feeding holes of the N absorbing tanks are respectively connected with an outlet of the tail-gas fan and are internally and respectively provided with an absorbing agent; the purified-gas discharging pipeline is connected with purified-gas discharging holes of the N absorbing tanks; the desorbing-steam input pipeline is connected with desorbing-steam feeding holes of the N absorbing tanks; the benzene-containing steam discharging pipeline is connected with benzene-containing steam discharging holes of the N absorbing tanks; an inlet of the condensation cooler is connected with an outlet of the benzene-containing steam discharging pipeline; the oil-water separating groove is connected with an outlet of the condensation cooler; the benzene storage groove is connected with an oil outlet of the oil-water separating groove. The device disclosed by the invention is simple in structure, convenient in modification and installation, convenient in adjustment, good in purifying effect, high in recovery efficiency and low in cost.

Description

technical field [0001] The invention belongs to the auxiliary process technology of benzene hydrogenation production in the chemical industry, and in particular relates to a device and method for purifying and recovering tail gas from benzene hydrogenation loading vehicles. Background technique [0002] The main products of benzene hydrogenation production are pure benzene, toluene, xylene, non-aromatics, C8-, C8+ and heavy benzene, each with independent loading bays and loading cranes. During the loading process, affected by factors such as flow rate changes and temperature rises, a large amount of low-boiling point benzene products evaporate to form tail gas, which escapes from the tanker loading port into the atmosphere. A large amount of benzene product tail gas escapes into the atmosphere, causing serious pollution to the enterprise and the surrounding environment, and causing great harm to the physical and mental health of the employees on the job and the surrounding r...

AI Technical Summary

Problems solved by technology

This device is used in the benzene hydrogenation tail gas treatment system, with simple structure and low cost. The liquid accumulated at the bottom of the vent pipe before entering the flare can be discharged through the liquid collection pipe, so as to avoid a large amount of black smoke generated by the flare system due to incomplete combustion, but Unable to recycle exhaust gas

[0005] So far, no reports on tail gas purification and recovery process of benzene hydrogenation system have been found

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