Safe and energy-saving high-purity sulfuric acid production device and operation method

Abstract

The invention relates to a safe and energy-saving high-purity sulfuric acid production device and an operation method. The device comprises a header tank, a heat exchanger, a heating kettle, a rectifying column, a condenser pipe, a low-boiling-point substance storage tank and a product storage tank, wherein heating rod inserting holes are respectively formed at two ends of the heating kettle; an electric heating rod is inserted into each heating rod inserting hole; slag discharge holes are respectively formed in the lower parts of two ends of the heating kettle; a slag discharge control valve is arranged on each slag discharge hole; the lower part of the rectifying column is connected with the heat exchanger; a snakelike condenser pipe is arranged inside the heat exchanger; a sulfuric acid raw material is preheated through the heat exchanger and enters the heating kettle; current is introduced into an electric heating rod, so that the electric energy is converted into heat energy, so as to generate heat inside the sulfuric acid, and boil and vaporize the sulfuric acid to enter the rectifying column; and the purified high-purity sulfuric acid and a raw material sulfuric acid are subjected to heat exchange, and cooled, so as to obtain the product. The invention provides the high-purity sulfuric acid production device, which is simple in structure, small in volume and heat radiating area, less in acid storage amount, high in safety, free of scale crust on the heating wall surface, long in service life, stable to operate, energy-saving and water-saving, and a method thereof.

Description

[0001] technical field [0002] The invention belongs to the field of fine chemical industry, and in particular relates to a safe and energy-saving high-purity sulfuric acid production device and an operation method. Background technique [0003] As a common reagent, sulfuric acid is widely used, especially high-purity sulfuric acid. With the rapid development of the electronic industry, the demand is increasing day by day. Because high-purity sulfuric acid has strict requirements on purity and impurity content, distillation technology is usually used for sulfuric acid purification. The raw sulfuric acid enters the distillation tower, is heated to boiling, vaporized, and then cooled by water to obtain a qualified product. The heating method is electric heating or coal heating. Coal heating is used. Because the heat temperature is not easy to control, the production is unstable, and it is difficult to obtain high-purity products. The current electric heating method is to us...

AI Technical Summary

Problems solved by technology

The heating method is electric heating or coal heating. Coal heating is used. Because the heat temperature is not easy to control, the production is unstable, and it is difficult to obtain high-purity products.

The current electric heating method is to use the electric heating wire to heat the partition wall of the heating element, that is, the electric heating wire converts the electric energy into heat energy, and then transfers the heat to the raw material sulfuric acid in the kettle through the glass or quartz tube wall, so that it is boiled and vaporized by heating. Distillation achieves the purpose of purification, which consumes a lot of energy and produces high production costs

In addition, no matter which heating method is used, the volume of the heating kettle is large, the amount of acid stored in the kettle is large, the heating is uneven, the boiling is not stable, there is bumping phenomenon, a large amount of mist is entrained, and the quality is unstable

Due to the large heat dissipation area and the heat transfer between the walls, the heating wall is prone to fouling, and once fouled, it is not easy to clean, resulting in low thermal efficiency and high energy consumption

In addition, sulfuric acid is very corrosive and has a high boiling point, and the wall temperature of the heating kettle is higher than the boiling temperature of sulfuric acid in the kettle. In addition, the scaling on the heating wall makes the wall temperature of the heating kettle higher, so it is easy to be burned out. Short life, leakage of hot sulfuric acid, resulting in production accidents, poor safety

The temperature of the finished product is very high, and cooling with water is uneconomical, resulting in waste of energy and water resources

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