Sulfuric acid concentration equipment and process

Abstract

The invention relates to sulfuric acid concentration equipment and a sulfuric acid concentration method. The sulfuric acid concentration equipment comprises a concentration tower, wherein the top of atower body of the concentration tower is provided with a gas phase outlet, the middle of the tower body is provided with a liquid phase inlet, the bottom of the tower body is provided with a liquid phase outlet, and the lower end of the tower body is provided with a plurality of gas phase inlets; the concentration tower comprises a stripping section positioned at the lower part and a rectification section positioned at the upper part; a plurality of glass tube heat exchangers are arranged at intervals from top to bottom in the rectification section; shell sides of the glass tube heat exchangers are connected in the rectification section; an external hot air gas source feeds hot air into the concentration tower from the gas phase inlets to carry out gas stripping on dilute sulfuric acid; and process gas in the stripping section forms full reflux in the shell sides of the plurality of glass tube heat exchangers in the rectification section. The apparatus provided by the invention has the advantages of small occupied area, high environmental protection index and good concentration effect.

Description

technical field [0001] The invention relates to the technical field of concentration of industrial dilute sulfuric acid. More specifically, the present invention relates to a sulfuric acid concentration equipment and process. Background technique [0002] According to the data of sulfuric acid / water physical properties, when the concentration of sulfuric acid in the liquid phase reaches 89% (w), the concentration of sulfuric acid in the gas phase is about 2.5% (w), and when the concentration of sulfuric acid in the liquid phase is 98.3% (w), sulfuric acid and water will form Azeotrope. The currently commonly used sulfuric acid concentration method is the equilibrium flash concentration method. The principle is that a stripping section is provided in the concentration tower, and the liquid phase is provided by the feed inlet at the top of the concentration tower. By heating the tower kettle, and relying on The liquid ring pump or steam evacuator generates negative pressure,...

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Problems solved by technology

The currently commonly used sulfuric acid concentration method is the equilibrium flash concentration method. The principle is that a stripping section is provided in the concentration tower, and the liquid phase is provided by the feed inlet at the top of the concentration tower. By heating the tower kettle, and relying on The liquid ring pump or steam evacuator generates negative pressure, and changes the partial pressure of water in the gas phase through the negative pressure, and then concentrates the dilute sulfuric acid in the concentration tower, but the negative pressure is greatly affected by the temperature of the cooling water. The effect is not good, and the gas phase is generated by the heating of the tower kettle. The heating tube of the tower kettle is directly in contact with high-temperature concentrated sulfuric acid and is easily corroded, and additional equipment and facilities need to be set up to deal with the sulfuric acid carried away in the gas phase, which will cause sulfur loss. It is difficult Obtain sulfuric acid with a concentration of 97% (w) and above

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