Production system and process for co-production of industrial-grade nitric acid and electronic-grade nitric acid

Abstract

The invention discloses a production system and process for co-production of industrial-grade nitric acid and electronic-grade nitric acid. The production system comprises an NOX separator; a materialoutlet of the NOX separator is communicated with a material inlet of a tail gas absorption tower and a material inlet of an electronic-grade nitric acid preparation tower; a first material outlet ofthe electronic-grade nitric acid preparation tower is communicated with the material inlet of the tail gas absorption tower; a second material outlet of the electronic-grade nitric acid preparation tower is communicated with a material inlet of the ultrafiltration device; a material outlet of the ultrafiltration device is communicated with a material inlet of an intermediate storage tank; a material outlet of the tail gas absorption tower is communicated with a material inlet of a bleaching tower; a material outlet of the bleaching tower is communicated with a material inlet of a cooling device; a material outlet of the cooling device is communicated with a material inlet of an industrial nitric acid tank. The production system is low in energy consumption, convenient to use, safe, efficient, simple in production process and high in production efficiency.

Description

technical field [0001] The invention belongs to the technical field of nitric acid preparation, and in particular relates to a production system and process for co-producing electronic-grade nitric acid with industrial-grade nitric acid. Background technique [0002] At present, the purification of electronic-grade nitric acid in my country generally uses reagent-grade nitric acid as a raw material, and the finished product of electronic nitric acid is obtained through secondary purification by heating. The disadvantages of this method are: the first is high energy consumption, reagent grade nitric acid is originally distilled from industrial grade nitric acid, so secondary distillation will inevitably lead to increased energy consumption; the second is environmental pollution, nitric acid will be partially decomposed into NO after being heated 2 , in order to ensure that the chroma reaches the standard, the nitric acid must be decolorized, and repeated decolorization will c...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the first is high energy consumption, reagent grade nitric acid is originally distilled from industrial grade nitric acid, so secondary distillation will inevitably lead to increased energy consumption; the second is environmental pollution, nitric acid will be partially decomposed into NO after being heated 2 , in order to ensure that the chroma reaches the standard, the nitric acid must be decolorized, and repeated decolorization will cause NO 2 Repeated discharge will cause pollution to the atmosphere or the water in the absorption tower; third, the production capacity and yield are low. Since distillation is a process of changing a liquid from a liquid to a gas and then to a liquid through condensation, it is necessary to There will be some non-condensable gas produced, and this part of non-condensable gas can only exist in gaseous form, and will not condense into liquid under normal conditions, so it will definitely cause material loss

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