Underpressure distillation tower and underpressure distillation method

Abstract

The invention discloses an underpressure distillation tower and an underpressure distillation method, which belong to the petroleum refining industry, so that problems of high height of the tower due to much filling material, large material consumption and high pressure drop of whole tower of the current underpressure distillation towers can be solved. The underpressure distillation tower comprises a cylindrical shell (10) and a tower inner member, a charging part, a washing part and a fractionation part from up to down. A gas distributor (1) is arranged in the charging part. Several fractionation segments are arranged at the fractionation part, each fractionation segment is composed of a spray-type liquid distributor (3) and an oil collection tank (6); a unidirectional nozzle (8) is arranged on the spray-type liquid distributor, and the oil collection tank is positioned below the spray-type liquid distributor. The underpressure distillation method is carried out by employing the underpressure distillation tower. The underpressure distillation method is mainly used for petroleum refining industry, height, material consumption and pressure drop of the whole drop of the underpressure distillation tower can be reduced, pull-out rate is increased, and product quality is improved.

Description

technical field [0001] The invention relates to a vacuum distillation tower and a vacuum distillation method used in the petroleum refining industry. Background technique [0002] At present, during the operation of the vacuum distillation tower used in the petroleum refining industry, the liquid flows back into the tower and is evenly distributed to the upper surface of the packing through a trough liquid distributor or a spray liquid distributor, and then goes down along the gap of the packing, and is formed by The oil and gas going up at the bottom of the packing are fully contacted, and the mass transfer is carried out at the same time as the heat transfer; the light component rises, and the heavy component goes down and falls into the oil collection tank directly below the packing. The formed side line product is pumped out from the oil collection tank by an oil pump, part of it enters the product oil tank, and part of it flows back into the tower to form a cycle. [0...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a vacuum distillation tower and a vacuum distillation method to solve the problem that the height of the tower is too high, the material consumption is high, and the pressure drop of the whole tower is too high due to the use of more fillers in the existing vacuum distillation tower. question

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