Production device and production process of EL-grade sulfuric acid

Abstract

The invention relates to a production device of EL-grade sulfuric acid. The production device comprises a first condenser, a second condenser, a first gasifier and a second gasifier which are connected in sequence. The first condenser is communicated with a falling film evaporator in the nicotinic acid evaporation process and is used for receiving evaporated sulfur trioxide gas; the second gasifier is connected with an EL-grade sulfuric acid absorption tower, the EL-grade sulfuric acid absorption tower is tower-tank integrated equipment and comprises an absorption tower body and an acid tank,the acid tank is connected with a circulating acid cooler through a circulating acid pump, and the outlet of the circulating acid cooler is divided into three paths which are respectively communicatedwith the acid tank, the absorption tower body and a diluter; the diluter is communicated with the water treatment device and is used for receiving high-purity water; the diluter is communicated withthe finished product acid cooler and is used for cooling to prepare finished product acid. The production device has the advantages of low energy consumption and no pollution. The invention also provides a production process of EL-grade sulfuric acid.

Description

technical field [0001] The invention relates to the field of sulfuric acid production devices, in particular to a production device of EL grade sulfuric acid and a production process thereof. Background technique [0002] At present, domestic EL grade sulfuric acid production methods mainly include rectification method and ultrapure water or ultrapure dilute sulfuric acid gas absorption method. [0003] The rectification method is to use industrial sulfuric acid to distill in a rectification tower to obtain higher purity sulfuric acid. However, since the raw materials used in this method contain a large amount of metal impurity ions, sulfur dioxide, acid radical ions and other organic matter, etc., they need to be pretreated before entering the device, and the relevant impurities must be oxidized by oxidizing agents to become sulfuric acid and sulfur dioxide. The pretreated sulfuric acid finally enters the rectification tower of special materials for rectification. Metal i...

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Problems solved by technology

The rectification operating temperature of this method reaches more than 300 degrees Celsius, which requires high material requirements for related equipment, and consumes energy. It is difficult to remove individual impurities. At the same time, waste gas and acid mist will be generated during the process, which has a certain impact on environmental protection and is not suitable. mass production

[0004] Ultrapure water or ultrapure dilute sulfuric acid gas absorption method is to use ultrapure water or ultrapure dilute sulfuric acid to absorb purified sulfur trioxide gas; this method is feasible from a technological point of view, but requires ultrapure water or ultrapure Dilute sulfuric acid (add ultrapure water to ultrapure concentrated sulfuric acid), relatively speaking, the cost is higher

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