Rich oil de-benzene process

Abstract

The invention discloses a rich oil de-benzene process, comprising the following steps: the rich oil from the final cooling benzol scrubbing unit is sent into a gas and oil exchanger to heat, then the oil is sent into a heat exchanger between lean oil and rich-oil to heat; the rich oil is heated to 160-180 DEG C and introduced to a de-benzene pipe tower type furnace to further heat to 190-200 DEG C, then the oil is sent to a de-benzene tower to remove benzene by distillation; the light benzene, fine heavy benzene and naphthalene oil produced by distillation de-benzene are extracted respectively from the overhead and side line of the de-benzene tower; after removing benzene, the rich oil is converted to lean oil and then sent to the tower pot; the first part of the lean oil in the tower potis sent to the de-benzene pipe tower type furnace to heat and then sent back to the de-benzene tower from the upside of the tower pot of the de-benzene tower to provide energy for the distillation ofrich oil; the second part of lean oil in the tower pot flows through the heat exchanger between lean oil and rich-oil, lean oil first chiller and lean oil second chiller to cool to 25-30 DEG C, and then the lean oil is sent back to the final cooling benzol scrubbing unit to recycle. The process can meet the demand of the final cooling benzol scrubbing recycling, has no out-emission of exhaust gasand waste water, simpler procedures, environmental friendliness and higher de-benzene rate.

Description

technical field [0001] The present invention relates to a technology for distilling and removing benzene from rich oil from the final cold washing benzene section in a coking enterprise, to be exact, a technology for removing benzene from rich oil Background technique [0002] At present, the final cold washing benzene section of domestic coking plants uses tar washing oil or petroleum washing oil to wash the benzene in the gas. The washing oil absorbs benzene and becomes rich oil. Oil. In order to ensure the recycling of the washing oil, the benzene in the rich oil must be removed to turn it into a lean oil that can be sent to the final cold washing benzene section for further benzene washing. Various existing processes use steam blowing to remove crude benzene in rich oil, and use single-tower process or double-tower process under normal pressure to obtain one kind of benzene, two kinds of benzene or three products . In the production process, since steam is used as the...

AI Technical Summary

Problems solved by technology

In the production process, since steam is used as the heat source of distillation, a large amount of difficult-to-handle crude benzene separation water will be produced, which not only consumes precious steam resources, but also easily causes serious environmental pollution. far from

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