Method and device for condensing, cooling and separating material from top of stabilizer tower in benzene hydrogenation process

Abstract

The invention relates to a method and device for condensing, cooling and separating a material from the top of a stabilizer tower in a benzene hydrogenation process. After the material from the top of a stabilizer tower is condensed and cooled in a tower top condenser-cooler, most of gas directly enters an exhaust condenser-cooler, and a small part of gas with liquid enters a gas-liquid separator; the liquid in the tower top condenser-cooler enters a reflux tank after passing through the gas-liquid separator; a gas phase separated by the gas-liquid separator enters the exhaust condenser-cooler, and the liquid separated flows into the reflux tank; the liquid condensed by the exhaust condenser-cooler enters the reflux tank; the liquid in the reflux tank is separated into oil and water. Most of the gas at the top of the stabilizer tower directly enters the exhaust condenser-cooler to be exhausted, so that the poor drainage caused by deposition of the non-condensable gas in a pipeline is avoided, the gas-liquid separation effect is improved, and the stabilization of stabilizer tower pressure and other operation indexes is ensured; the tower top condenser-cooler, the gas-liquid separator and the reflux tank are integrated into a structure, so the occupied area is small.

Description

technical field [0001] The invention relates to the technical field of refining production of crude benzene, in particular to a method and device for condensing, cooling and separating overhead materials of a stabilization tower in a benzene hydrogenation process. Background technique [0002] The purpose of refining crude benzene is to remove impurities such as alkanes, olefins, sulfur-containing compounds and nitrogen-containing compounds in crude benzene, and then obtain pure benzene, pure toluene, xylene and other products through rectification and separation. [0003] In the two-stage gas-phase low-temperature catalytic hydrogenation process, in the pre-reactor, it is mainly to saturate diolefins and styrene, and in the main reactor, it is mainly to remove sulfur, nitrogen and oxides, and convert them into hydrogen sulfide, water And ammonia; these substances enter the stabilization tower together with the materials after the high-pressure separation tank. In the stabi...

AI Technical Summary

Problems solved by technology

[0005] There are some problems in the actual production and operation of the above processes and devices, mainly due to the unsmooth drainage of liquid in the pipeline from the condensing cooler at the top of the stabilization tower to the reflux tank, and the unsatisfactory gas-liquid separation effect in the reflux tank. tower pressure instability

Cause the reason analysis of above-mentioned phenomenon as follows: Since the stable tower top gas is mainly C4, C5 alkane, H 2 , NH 3 、H 2 S and H 2 For non-condensable gases such as O, after passing through the condensing cooler at the top of the stabilization tower, the volume ratio of the gas phase to the liquid phase is about 15:1. Such a large gas-liquid ratio will cause the non-condensable gas to deposit in the pipeline. And lead to the stagnation of the liquid, which will eventually affect the pressure of the stable column and other operating indicators

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