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Process for producing refined sulfuric acid by sulphuric acid plant

A sulfuric acid and process technology, applied in the fields of sulfur compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of high raw material quality and flue gas pretreatment requirements, reduce flue gas pretreatment load, improve product quality, and reduce production costs. Effect

Active Publication Date: 2018-11-13
CHINA NERIN ENG
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Problems solved by technology

The production process of this method is simple, the production cost is relatively low, the product quality is high, and it has good commercial profits, but it has high requirements for raw material quality and flue gas pretreatment

Method used

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  • Process for producing refined sulfuric acid by sulphuric acid plant

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Embodiment 1

[0023] A process for producing refined sulfuric acid in a sulfuric acid plant. The process flow is as follows: 1) Extract the flue gas from the primary transformation of the copper smelting acid plant, containing about 15% (V) of sulfur trioxide, and remove the acid mist through the flue gas filter After being mixed with smoke and dust, it enters the absorption tower, where it is sprayed with 98.3% sulfuric acid at about 50°C. After the flue gas is demistered by the fiber demister, it is sent back to the copper smelting acid plant by the flue gas fan. The concentrated sulfuric acid in the absorption tower enters the circulation pump tank of the absorption tower, and ultrapure water is added to adjust the acid concentration to 98.3%, and the acid temperature is about 90°C. The circulation pump tank of the absorption tower is sent to the acid cooler through the absorption tower circulation pump to cool down to 50°C and returned to the absorption tower for spraying. The sulfuric a...

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Abstract

The invention relates to a process for producing a refined sulfuric acid by a sulphuric acid plant, specifically, the sulfur trioxide containing exhaust gas of the sulphuric acid plant is taken as theraw material, is filtered by an exhaust gas filter to remove the impurity, is then conveyed to an absorption tower, and is absorbed by concentrated sulfuric acid, the concentration of the sulfuric acid is regulated by using the ultrapure water, the dilution heat and the heat of the sulfuric acid are used to desorb the sulfuric acid at the high temperature, the nitric oxide and the sulfur dioxidein the sulfuric acid are removed, and the refined sulfuric acid is prepared. A refined sulfuric acid product is a reagent sulfuric acid or a sulfuric acid for a storage battery according to the condition of the exhaust gas. The process of the method is simple, the energy consumption is low, the investment is saved, and the process is suitable for the transformation of the newly built sulphuric acid plant and the old sulphuric acid plant.

Description

technical field [0001] The invention relates to a process for producing refined sulfuric acid in a sulfuric acid plant, and specifically belongs to the technical field of chemical industry. Background technique [0002] There are three main processes for the production of refined sulfuric acid at home and abroad: 1) Distillation method: Distill and recondense industrial sulfuric acid to achieve the purpose of purification, and the high-purity sulfuric acid product can reach its purity electronic grade refined sulfuric acid specification. This method product has high added value, but process output is low, and production cost is high. 2) Liquid sulfur trioxide method: heating fuming sulfuric acid, steaming out pure gaseous sulfur trioxide and then condensing it, mixing liquid sulfur trioxide with ultrapure water to prepare refined sulfuric acid. This method has high product added value and high process output, but the production cost is also high, and it needs to cooperate w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74
CPCC01B17/74
Inventor 郭晴曹霞黄卫华姜凯刘涛
Owner CHINA NERIN ENG
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