Combined hydrogen chloride absorption tower

Abstract

The invention relates to a combined hydrogen chloride absorption tower, which comprises a tower body, wherein the tower body consists of a primary absorption section and a secondary absorption section arranged above the primary absorption section; the primary absorption section consists of two parts, i.e. an upper barrel and a lower barrel, and the secondary absorption section consists of three parts, i.e. an upper barrel, a middle barrel and a lower barrel; an inner cavity of the lower barrel of the primary absorption section is communicated with the lower end of a perpendicular flow passage, the lower barrel is a graphite barrel, an acid outlet is formed in the bottom of the lower barrel, and a hydrogen chloride inlet is formed in the sidewall of the lower barrel. The combined hydrogen chloride absorption tower has the advantages that hydrogen chloride enters the absorption tower from the bottom of the primary absorption section, diluted hydrochloric acid enters the absorption tower from the top, and a backflow absorption mode is adopted, so that the heat exchange area is large, and the absorption rate of hydrogen chloride is increased; meanwhile, the diluted hydrochloric acid of the secondary absorption section flows into the primary absorption section directly along the perpendicular flow passage after passing through a filler layer, so that a conventional external pipe connecting mode is eliminated, and the material cost is lowered.

Description

technical field [0001] The invention relates to a hydrogen chloride combined absorption tower gas absorption tower for chemical production, in particular to a hydrogen chloride combined absorption tower with good absorption effect. Background technique [0002] In chemical production, hydrogen chloride synthesis furnace produces hydrogen chloride gas, and hydrogen chloride gas needs to be absorbed by low concentration hydrochloric acid or water to obtain concentrated hydrochloric acid. In the traditional hydrogen chloride absorber, both low-concentration hydrochloric acid and hydrogen chloride gas move from top to bottom. When moving, the hydrogen chloride gas is cooled and released by the heat exchanger in the middle section and then dissolved into the low-concentration hydrochloric acid to obtain concentrated hydrochloric acid. [0003] The invention patent with the patent number of CN 102583247 A refers to a combined absorber of a hydrogen chloride combined absorption...

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Problems solved by technology

[0004] In the above-mentioned patent, the liquid outlet of the secondary absorption section needs to be connected with the liquid inlet of the primary absorption section through an external pipe. Due to the increased material cost of the external pipe, and the pipe is easy to be blocked, at the same time, due to the hydrogen chloride gas flowing from the primary absorption section The top enters, after cooling, it becomes hydrochloric acid and flows out from the bottom of the primary absorption section, and its flow direction is the same as that of the hydrochloric acid entering the primary absorption section, and the absorption effect is poor

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